src/OpenGL/libGLESv2/Context.cpp

// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Context.cpp: Implements the es2::Context class, managing all GL state and performing
// rendering operations. It is the GLES2 specific implementation of EGLContext.

#include "Context.h"

#include "main.h"
#include "mathutil.h"
#include "utilities.h"
#include "ResourceManager.h"
#include "Buffer.h"
#include "Fence.h"
#include "Framebuffer.h"
#include "Program.h"
#include "Query.h"
#include "Renderbuffer.h"
#include "Sampler.h"
#include "Shader.h"
#include "Texture.h"
#include "TransformFeedback.h"
#include "VertexArray.h"
#include "VertexDataManager.h"
#include "IndexDataManager.h"
#include "libEGL/Display.h"
#include "common/Surface.hpp"
#include "Common/Half.hpp"

#include <EGL/eglext.h>

#include <algorithm>
#include <string>

namespace es2
{
Context::Context(egl::Display *display, const Context *shareContext, const egl::Config *config)
	: egl::Context(display), config(config)
{
	sw::Context *context = new sw::Context();
	device = new es2::Device(context);

	setClearColor(0.0f, 0.0f, 0.0f, 0.0f);

	mState.depthClearValue = 1.0f;
	mState.stencilClearValue = 0;

	mState.cullFaceEnabled = false;
	mState.cullMode = GL_BACK;
	mState.frontFace = GL_CCW;
	mState.depthTestEnabled = false;
	mState.depthFunc = GL_LESS;
	mState.blendEnabled = false;
	mState.sourceBlendRGB = GL_ONE;
	mState.sourceBlendAlpha = GL_ONE;
	mState.destBlendRGB = GL_ZERO;
	mState.destBlendAlpha = GL_ZERO;
	mState.blendEquationRGB = GL_FUNC_ADD;
	mState.blendEquationAlpha = GL_FUNC_ADD;
	mState.blendColor.red = 0;
	mState.blendColor.green = 0;
	mState.blendColor.blue = 0;
	mState.blendColor.alpha = 0;
	mState.stencilTestEnabled = false;
	mState.stencilFunc = GL_ALWAYS;
	mState.stencilRef = 0;
	mState.stencilMask = 0xFFFFFFFFu;
	mState.stencilWritemask = 0xFFFFFFFFu;
	mState.stencilBackFunc = GL_ALWAYS;
	mState.stencilBackRef = 0;
	mState.stencilBackMask = 0xFFFFFFFFu;
	mState.stencilBackWritemask = 0xFFFFFFFFu;
	mState.stencilFail = GL_KEEP;
	mState.stencilPassDepthFail = GL_KEEP;
	mState.stencilPassDepthPass = GL_KEEP;
	mState.stencilBackFail = GL_KEEP;
	mState.stencilBackPassDepthFail = GL_KEEP;
	mState.stencilBackPassDepthPass = GL_KEEP;
	mState.polygonOffsetFillEnabled = false;
	mState.polygonOffsetFactor = 0.0f;
	mState.polygonOffsetUnits = 0.0f;
	mState.sampleAlphaToCoverageEnabled = false;
	mState.sampleCoverageEnabled = false;
	mState.sampleCoverageValue = 1.0f;
	mState.sampleCoverageInvert = false;
	mState.scissorTestEnabled = false;
	mState.ditherEnabled = true;
	mState.primitiveRestartFixedIndexEnabled = false;
	mState.rasterizerDiscardEnabled = false;
	mState.generateMipmapHint = GL_DONT_CARE;
	mState.fragmentShaderDerivativeHint = GL_DONT_CARE;
	mState.textureFilteringHint = GL_DONT_CARE;

	mState.lineWidth = 1.0f;

	mState.viewportX = 0;
	mState.viewportY = 0;
	mState.viewportWidth = 0;
	mState.viewportHeight = 0;
	mState.zNear = 0.0f;
	mState.zFar = 1.0f;

	mState.scissorX = 0;
	mState.scissorY = 0;
	mState.scissorWidth = 0;
	mState.scissorHeight = 0;

	mState.colorMaskRed = true;
	mState.colorMaskGreen = true;
	mState.colorMaskBlue = true;
	mState.colorMaskAlpha = true;
	mState.depthMask = true;

	if(shareContext)
	{
		mResourceManager = shareContext->mResourceManager;
		mResourceManager->addRef();
	}
	else
	{
		mResourceManager = new ResourceManager();
	}

	// [OpenGL ES 2.0.24] section 3.7 page 83:
	// In the initial state, TEXTURE_2D and TEXTURE_CUBE_MAP have twodimensional
	// and cube map texture state vectors respectively associated with them.
	// In order that access to these initial textures not be lost, they are treated as texture
	// objects all of whose names are 0.

	mTexture2DZero = new Texture2D(0);
	mTexture3DZero = new Texture3D(0);
	mTexture2DArrayZero = new Texture2DArray(0);
	mTextureCubeMapZero = new TextureCubeMap(0);
	mTexture2DRectZero = new Texture2DRect(0);
	mTextureExternalZero = new TextureExternal(0);

	mState.activeSampler = 0;

	for(int type = 0; type < TEXTURE_TYPE_COUNT; type++)
	{
		bindTexture((TextureType)type, 0);
	}

	bindVertexArray(0);
	bindArrayBuffer(0);
	bindElementArrayBuffer(0);
	bindReadFramebuffer(0);
	bindDrawFramebuffer(0);
	bindRenderbuffer(0);
	bindGenericUniformBuffer(0);
	bindTransformFeedback(0);

	mState.currentProgram = 0;

	mVertexDataManager = nullptr;
	mIndexDataManager = nullptr;

	mInvalidEnum = false;
	mInvalidValue = false;
	mInvalidOperation = false;
	mOutOfMemory = false;
	mInvalidFramebufferOperation = false;

	mHasBeenCurrent = false;

	markAllStateDirty();
}

Context::~Context()
{
	if(mState.currentProgram != 0)
	{
		Program *programObject = mResourceManager->getProgram(mState.currentProgram);
		if(programObject)
		{
			programObject->release();
		}
		mState.currentProgram = 0;
	}

	while(!mFramebufferNameSpace.empty())
	{
		deleteFramebuffer(mFramebufferNameSpace.firstName());
	}

	while(!mFenceNameSpace.empty())
	{
		deleteFence(mFenceNameSpace.firstName());
	}

	while(!mQueryNameSpace.empty())
	{
		deleteQuery(mQueryNameSpace.firstName());
	}

	while(!mVertexArrayNameSpace.empty())
	{
		deleteVertexArray(mVertexArrayNameSpace.lastName());
	}

	while(!mTransformFeedbackNameSpace.empty())
	{
		deleteTransformFeedback(mTransformFeedbackNameSpace.firstName());
	}

	for(int type = 0; type < TEXTURE_TYPE_COUNT; type++)
	{
		for(int sampler = 0; sampler < MAX_COMBINED_TEXTURE_IMAGE_UNITS; sampler++)
		{
			mState.samplerTexture[type][sampler] = nullptr;
		}
	}

	for(int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
	{
		mState.vertexAttribute[i].mBoundBuffer = nullptr;
	}

	for(int i = 0; i < QUERY_TYPE_COUNT; i++)
	{
		mState.activeQuery[i] = nullptr;
	}

	mState.arrayBuffer = nullptr;
	mState.copyReadBuffer = nullptr;
	mState.copyWriteBuffer = nullptr;
	mState.pixelPackBuffer = nullptr;
	mState.pixelUnpackBuffer = nullptr;
	mState.genericUniformBuffer = nullptr;
	mState.genericTransformFeedbackBuffer = nullptr;

	for(int i = 0; i < MAX_UNIFORM_BUFFER_BINDINGS; i++) {
		mState.uniformBuffers[i].set(nullptr, 0, 0);
	}

	mState.renderbuffer = nullptr;

	for(int i = 0; i < MAX_COMBINED_TEXTURE_IMAGE_UNITS; ++i)
	{
		mState.sampler[i] = nullptr;
	}

	mTexture2DZero = nullptr;
	mTexture3DZero = nullptr;
	mTexture2DArrayZero = nullptr;
	mTextureCubeMapZero = nullptr;
	mTexture2DRectZero = nullptr;
	mTextureExternalZero = nullptr;

	delete mVertexDataManager;
	delete mIndexDataManager;

	mResourceManager->release();
	delete device;
}

void Context::makeCurrent(gl::Surface *surface)
{
	if(!mHasBeenCurrent)
	{
		mVertexDataManager = new VertexDataManager(this);
		mIndexDataManager = new IndexDataManager();

		mState.viewportX = 0;
		mState.viewportY = 0;
		mState.viewportWidth = surface ? surface->getWidth() : 0;
		mState.viewportHeight = surface ? surface->getHeight() : 0;

		mState.scissorX = 0;
		mState.scissorY = 0;
		mState.scissorWidth = surface ? surface->getWidth() : 0;
		mState.scissorHeight = surface ? surface->getHeight() : 0;

		mHasBeenCurrent = true;
	}

	if(surface)
	{
		// Wrap the existing resources into GL objects and assign them to the '0' names
		egl::Image *defaultRenderTarget = surface->getRenderTarget();
		egl::Image *depthStencil = surface->getDepthStencil();

		Colorbuffer *colorbufferZero = new Colorbuffer(defaultRenderTarget);
		DepthStencilbuffer *depthStencilbufferZero = new DepthStencilbuffer(depthStencil);
		Framebuffer *framebufferZero = new DefaultFramebuffer(colorbufferZero, depthStencilbufferZero);

		setFramebufferZero(framebufferZero);

		if(defaultRenderTarget)
		{
			defaultRenderTarget->release();
		}

		if(depthStencil)
		{
			depthStencil->release();
		}
	}
	else
	{
		setFramebufferZero(nullptr);
	}

	markAllStateDirty();
}

EGLint Context::getClientVersion() const
{
	return 3;
}

EGLint Context::getConfigID() const
{
	return config->mConfigID;
}

// This function will set all of the state-related dirty flags, so that all state is set during next pre-draw.
void Context::markAllStateDirty()
{
	mAppliedProgramSerial = 0;

	mDepthStateDirty = true;
	mMaskStateDirty = true;
	mBlendStateDirty = true;
	mStencilStateDirty = true;
	mPolygonOffsetStateDirty = true;
	mSampleStateDirty = true;
	mDitherStateDirty = true;
	mFrontFaceDirty = true;
}

void Context::setClearColor(float red, float green, float blue, float alpha)
{
	mState.colorClearValue.red = red;
	mState.colorClearValue.green = green;
	mState.colorClearValue.blue = blue;
	mState.colorClearValue.alpha = alpha;
}

void Context::setClearDepth(float depth)
{
	mState.depthClearValue = depth;
}

void Context::setClearStencil(int stencil)
{
	mState.stencilClearValue = stencil;
}

void Context::setCullFaceEnabled(bool enabled)
{
	mState.cullFaceEnabled = enabled;
}

bool Context::isCullFaceEnabled() const
{
	return mState.cullFaceEnabled;
}

void Context::setCullMode(GLenum mode)
{
   mState.cullMode = mode;
}

void Context::setFrontFace(GLenum front)
{
	if(mState.frontFace != front)
	{
		mState.frontFace = front;
		mFrontFaceDirty = true;
	}
}

void Context::setDepthTestEnabled(bool enabled)
{
	if(mState.depthTestEnabled != enabled)
	{
		mState.depthTestEnabled = enabled;
		mDepthStateDirty = true;
	}
}

bool Context::isDepthTestEnabled() const
{
	return mState.depthTestEnabled;
}

void Context::setDepthFunc(GLenum depthFunc)
{
	if(mState.depthFunc != depthFunc)
	{
		mState.depthFunc = depthFunc;
		mDepthStateDirty = true;
	}
}

void Context::setDepthRange(float zNear, float zFar)
{
	mState.zNear = zNear;
	mState.zFar = zFar;
}

void Context::setBlendEnabled(bool enabled)
{
	if(mState.blendEnabled != enabled)
	{
		mState.blendEnabled = enabled;
		mBlendStateDirty = true;
	}
}

bool Context::isBlendEnabled() const
{
	return mState.blendEnabled;
}

void Context::setBlendFactors(GLenum sourceRGB, GLenum destRGB, GLenum sourceAlpha, GLenum destAlpha)
{
	if(mState.sourceBlendRGB != sourceRGB ||
	   mState.sourceBlendAlpha != sourceAlpha ||
	   mState.destBlendRGB != destRGB ||
	   mState.destBlendAlpha != destAlpha)
	{
		mState.sourceBlendRGB = sourceRGB;
		mState.destBlendRGB = destRGB;
		mState.sourceBlendAlpha = sourceAlpha;
		mState.destBlendAlpha = destAlpha;
		mBlendStateDirty = true;
	}
}

void Context::setBlendColor(float red, float green, float blue, float alpha)
{
	if(mState.blendColor.red != red ||
	   mState.blendColor.green != green ||
	   mState.blendColor.blue != blue ||
	   mState.blendColor.alpha != alpha)
	{
		mState.blendColor.red = red;
		mState.blendColor.green = green;
		mState.blendColor.blue = blue;
		mState.blendColor.alpha = alpha;
		mBlendStateDirty = true;
	}
}

void Context::setBlendEquation(GLenum rgbEquation, GLenum alphaEquation)
{
	if(mState.blendEquationRGB != rgbEquation ||
	   mState.blendEquationAlpha != alphaEquation)
	{
		mState.blendEquationRGB = rgbEquation;
		mState.blendEquationAlpha = alphaEquation;
		mBlendStateDirty = true;
	}
}

void Context::setStencilTestEnabled(bool enabled)
{
	if(mState.stencilTestEnabled != enabled)
	{
		mState.stencilTestEnabled = enabled;
		mStencilStateDirty = true;
	}
}

bool Context::isStencilTestEnabled() const
{
	return mState.stencilTestEnabled;
}

void Context::setStencilParams(GLenum stencilFunc, GLint stencilRef, GLuint stencilMask)
{
	if(mState.stencilFunc != stencilFunc ||
	   mState.stencilRef != stencilRef ||
	   mState.stencilMask != stencilMask)
	{
		mState.stencilFunc = stencilFunc;
		mState.stencilRef = (stencilRef > 0) ? stencilRef : 0;
		mState.stencilMask = stencilMask;
		mStencilStateDirty = true;
	}
}

void Context::setStencilBackParams(GLenum stencilBackFunc, GLint stencilBackRef, GLuint stencilBackMask)
{
	if(mState.stencilBackFunc != stencilBackFunc ||
	   mState.stencilBackRef != stencilBackRef ||
	   mState.stencilBackMask != stencilBackMask)
	{
		mState.stencilBackFunc = stencilBackFunc;
		mState.stencilBackRef = (stencilBackRef > 0) ? stencilBackRef : 0;
		mState.stencilBackMask = stencilBackMask;
		mStencilStateDirty = true;
	}
}

void Context::setStencilWritemask(GLuint stencilWritemask)
{
	if(mState.stencilWritemask != stencilWritemask)
	{
		mState.stencilWritemask = stencilWritemask;
		mStencilStateDirty = true;
	}
}

void Context::setStencilBackWritemask(GLuint stencilBackWritemask)
{
	if(mState.stencilBackWritemask != stencilBackWritemask)
	{
		mState.stencilBackWritemask = stencilBackWritemask;
		mStencilStateDirty = true;
	}
}

void Context::setStencilOperations(GLenum stencilFail, GLenum stencilPassDepthFail, GLenum stencilPassDepthPass)
{
	if(mState.stencilFail != stencilFail ||
	   mState.stencilPassDepthFail != stencilPassDepthFail ||
	   mState.stencilPassDepthPass != stencilPassDepthPass)
	{
		mState.stencilFail = stencilFail;
		mState.stencilPassDepthFail = stencilPassDepthFail;
		mState.stencilPassDepthPass = stencilPassDepthPass;
		mStencilStateDirty = true;
	}
}

void Context::setStencilBackOperations(GLenum stencilBackFail, GLenum stencilBackPassDepthFail, GLenum stencilBackPassDepthPass)
{
	if(mState.stencilBackFail != stencilBackFail ||
	   mState.stencilBackPassDepthFail != stencilBackPassDepthFail ||
	   mState.stencilBackPassDepthPass != stencilBackPassDepthPass)
	{
		mState.stencilBackFail = stencilBackFail;
		mState.stencilBackPassDepthFail = stencilBackPassDepthFail;
		mState.stencilBackPassDepthPass = stencilBackPassDepthPass;
		mStencilStateDirty = true;
	}
}

void Context::setPolygonOffsetFillEnabled(bool enabled)
{
	if(mState.polygonOffsetFillEnabled != enabled)
	{
		mState.polygonOffsetFillEnabled = enabled;
		mPolygonOffsetStateDirty = true;
	}
}

bool Context::isPolygonOffsetFillEnabled() const
{
	return mState.polygonOffsetFillEnabled;
}

void Context::setPolygonOffsetParams(GLfloat factor, GLfloat units)
{
	if(mState.polygonOffsetFactor != factor ||
	   mState.polygonOffsetUnits != units)
	{
		mState.polygonOffsetFactor = factor;
		mState.polygonOffsetUnits = units;
		mPolygonOffsetStateDirty = true;
	}
}

void Context::setSampleAlphaToCoverageEnabled(bool enabled)
{
	if(mState.sampleAlphaToCoverageEnabled != enabled)
	{
		mState.sampleAlphaToCoverageEnabled = enabled;
		mSampleStateDirty = true;
	}
}

bool Context::isSampleAlphaToCoverageEnabled() const
{
	return mState.sampleAlphaToCoverageEnabled;
}

void Context::setSampleCoverageEnabled(bool enabled)
{
	if(mState.sampleCoverageEnabled != enabled)
	{
		mState.sampleCoverageEnabled = enabled;
		mSampleStateDirty = true;
	}
}

bool Context::isSampleCoverageEnabled() const
{
	return mState.sampleCoverageEnabled;
}

void Context::setSampleCoverageParams(GLclampf value, bool invert)
{
	if(mState.sampleCoverageValue != value ||
	   mState.sampleCoverageInvert != invert)
	{
		mState.sampleCoverageValue = value;
		mState.sampleCoverageInvert = invert;
		mSampleStateDirty = true;
	}
}

void Context::setScissorTestEnabled(bool enabled)
{
	mState.scissorTestEnabled = enabled;
}

bool Context::isScissorTestEnabled() const
{
	return mState.scissorTestEnabled;
}

void Context::setDitherEnabled(bool enabled)
{
	if(mState.ditherEnabled != enabled)
	{
		mState.ditherEnabled = enabled;
		mDitherStateDirty = true;
	}
}

bool Context::isDitherEnabled() const
{
	return mState.ditherEnabled;
}

void Context::setPrimitiveRestartFixedIndexEnabled(bool enabled)
{
	mState.primitiveRestartFixedIndexEnabled = enabled;
}

bool Context::isPrimitiveRestartFixedIndexEnabled() const
{
	return mState.primitiveRestartFixedIndexEnabled;
}

void Context::setRasterizerDiscardEnabled(bool enabled)
{
	mState.rasterizerDiscardEnabled = enabled;
}

bool Context::isRasterizerDiscardEnabled() const
{
	return mState.rasterizerDiscardEnabled;
}

void Context::setLineWidth(GLfloat width)
{
	mState.lineWidth = width;
	device->setLineWidth(clamp(width, ALIASED_LINE_WIDTH_RANGE_MIN, ALIASED_LINE_WIDTH_RANGE_MAX));
}

void Context::setGenerateMipmapHint(GLenum hint)
{
	mState.generateMipmapHint = hint;
}

void Context::setFragmentShaderDerivativeHint(GLenum hint)
{
	mState.fragmentShaderDerivativeHint = hint;
	// TODO: Propagate the hint to shader translator so we can write
	// ddx, ddx_coarse, or ddx_fine depending on the hint.
	// Ignore for now. It is valid for implementations to ignore hint.
}

void Context::setTextureFilteringHint(GLenum hint)
{
	mState.textureFilteringHint = hint;
}

void Context::setViewportParams(GLint x, GLint y, GLsizei width, GLsizei height)
{
	mState.viewportX = x;
	mState.viewportY = y;
	mState.viewportWidth = std::min<GLsizei>(width, IMPLEMENTATION_MAX_RENDERBUFFER_SIZE);     // GL_MAX_VIEWPORT_DIMS[0]
	mState.viewportHeight = std::min<GLsizei>(height, IMPLEMENTATION_MAX_RENDERBUFFER_SIZE);   // GL_MAX_VIEWPORT_DIMS[1]
}

void Context::setScissorParams(GLint x, GLint y, GLsizei width, GLsizei height)
{
	mState.scissorX = x;
	mState.scissorY = y;

	// An overflow happens when (infinite precision) X + Width > INT32_MAX. We
	// can change that formula to "X > INT32_MAX - Width". And when we bring it
	// down to 32-bit precision, we know it's safe because width is non-negative.
	if (x > INT32_MAX - width)
	{
		width = INT32_MAX - x;
	}

	if (y > INT32_MAX - height)
	{
		height = INT32_MAX - y;
	}

	mState.scissorWidth = width;
	mState.scissorHeight = height;
}

void Context::setColorMask(bool red, bool green, bool blue, bool alpha)
{
	if(mState.colorMaskRed != red || mState.colorMaskGreen != green ||
	   mState.colorMaskBlue != blue || mState.colorMaskAlpha != alpha)
	{
		mState.colorMaskRed = red;
		mState.colorMaskGreen = green;
		mState.colorMaskBlue = blue;
		mState.colorMaskAlpha = alpha;
		mMaskStateDirty = true;
	}
}

unsigned int Context::getColorMask() const
{
	return (mState.colorMaskRed ? 0x1 : 0) |
	       (mState.colorMaskGreen ? 0x2 : 0) |
	       (mState.colorMaskBlue ? 0x4 : 0) |
	       (mState.colorMaskAlpha ? 0x8 : 0);
}

void Context::setDepthMask(bool mask)
{
	if(mState.depthMask != mask)
	{
		mState.depthMask = mask;
		mMaskStateDirty = true;
	}
}

void Context::setActiveSampler(unsigned int active)
{
	mState.activeSampler = active;
}

GLuint Context::getReadFramebufferName() const
{
	return mState.readFramebuffer;
}

GLuint Context::getDrawFramebufferName() const
{
	return mState.drawFramebuffer;
}

GLuint Context::getRenderbufferName() const
{
	return mState.renderbuffer.name();
}

void Context::setFramebufferReadBuffer(GLuint buf)
{
	Framebuffer *framebuffer = getReadFramebuffer();

	if(framebuffer)
	{
		framebuffer->setReadBuffer(buf);
	}
	else
	{
		return error(GL_INVALID_OPERATION);
	}
}

void Context::setFramebufferDrawBuffers(GLsizei n, const GLenum *bufs)
{
	Framebuffer *drawFramebuffer = getDrawFramebuffer();

	if(drawFramebuffer)
	{
		for(int i = 0; i < MAX_COLOR_ATTACHMENTS; i++)
		{
			drawFramebuffer->setDrawBuffer(i, (i < n) ? bufs[i] : GL_NONE);
		}
	}
	else
	{
		return error(GL_INVALID_OPERATION);
	}
}

GLuint Context::getArrayBufferName() const
{
	return mState.arrayBuffer.name();
}

GLuint Context::getElementArrayBufferName() const
{
	Buffer* elementArrayBuffer = getCurrentVertexArray()->getElementArrayBuffer();
	return elementArrayBuffer ? elementArrayBuffer->name : 0;
}

GLuint Context::getActiveQuery(GLenum target) const
{
	Query *queryObject = nullptr;

	switch(target)
	{
	case GL_ANY_SAMPLES_PASSED_EXT:
		queryObject = mState.activeQuery[QUERY_ANY_SAMPLES_PASSED];
		break;
	case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
		queryObject = mState.activeQuery[QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE];
		break;
	case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
		queryObject = mState.activeQuery[QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN];
		break;
	default:
		ASSERT(false);
	}

	if(queryObject)
	{
		return queryObject->name;
	}

	return 0;
}

void Context::setVertexAttribArrayEnabled(unsigned int attribNum, bool enabled)
{
	getCurrentVertexArray()->enableAttribute(attribNum, enabled);
}

void Context::setVertexAttribDivisor(unsigned int attribNum, GLuint divisor)
{
	getCurrentVertexArray()->setVertexAttribDivisor(attribNum, divisor);
}

const VertexAttribute &Context::getVertexAttribState(unsigned int attribNum) const
{
	return getCurrentVertexArray()->getVertexAttribute(attribNum);
}

void Context::setVertexAttribState(unsigned int attribNum, Buffer *boundBuffer, GLint size, GLenum type,
                                   bool normalized, bool pureInteger, GLsizei stride, const void *pointer)
{
	getCurrentVertexArray()->setAttributeState(attribNum, boundBuffer, size, type, normalized, pureInteger, stride, pointer);
}

const void *Context::getVertexAttribPointer(unsigned int attribNum) const
{
	return getCurrentVertexArray()->getVertexAttribute(attribNum).mPointer;
}

const VertexAttributeArray &Context::getVertexArrayAttributes()
{
	return getCurrentVertexArray()->getVertexAttributes();
}

const VertexAttributeArray &Context::getCurrentVertexAttributes()
{
	return mState.vertexAttribute;
}

void Context::setPackAlignment(GLint alignment)
{
	mState.packParameters.alignment = alignment;
}

void Context::setUnpackAlignment(GLint alignment)
{
	mState.unpackParameters.alignment = alignment;
}

const gl::PixelStorageModes &Context::getUnpackParameters() const
{
	return mState.unpackParameters;
}

void Context::setPackRowLength(GLint rowLength)
{
	mState.packParameters.rowLength = rowLength;
}

void Context::setPackSkipPixels(GLint skipPixels)
{
	mState.packParameters.skipPixels = skipPixels;
}

void Context::setPackSkipRows(GLint skipRows)
{
	mState.packParameters.skipRows = skipRows;
}

void Context::setUnpackRowLength(GLint rowLength)
{
	mState.unpackParameters.rowLength = rowLength;
}

void Context::setUnpackImageHeight(GLint imageHeight)
{
	mState.unpackParameters.imageHeight = imageHeight;
}

void Context::setUnpackSkipPixels(GLint skipPixels)
{
	mState.unpackParameters.skipPixels = skipPixels;
}

void Context::setUnpackSkipRows(GLint skipRows)
{
	mState.unpackParameters.skipRows = skipRows;
}

void Context::setUnpackSkipImages(GLint skipImages)
{
	mState.unpackParameters.skipImages = skipImages;
}

GLuint Context::createBuffer()
{
	return mResourceManager->createBuffer();
}

GLuint Context::createProgram()
{
	return mResourceManager->createProgram();
}

GLuint Context::createShader(GLenum type)
{
	return mResourceManager->createShader(type);
}

GLuint Context::createTexture()
{
	return mResourceManager->createTexture();
}

GLuint Context::createRenderbuffer()
{
	return mResourceManager->createRenderbuffer();
}

// Returns an unused framebuffer name
GLuint Context::createFramebuffer()
{
	return mFramebufferNameSpace.allocate();
}

GLuint Context::createFence()
{
	return mFenceNameSpace.allocate(new Fence());
}

// Returns an unused query name
GLuint Context::createQuery()
{
	return mQueryNameSpace.allocate();
}

// Returns an unused vertex array name
GLuint Context::createVertexArray()
{
	return mVertexArrayNameSpace.allocate();
}

GLsync Context::createFenceSync(GLenum condition, GLbitfield flags)
{
	GLuint handle = mResourceManager->createFenceSync(condition, flags);

	return reinterpret_cast<GLsync>(static_cast<uintptr_t>(handle));
}

// Returns an unused transform feedback name
GLuint Context::createTransformFeedback()
{
	return mTransformFeedbackNameSpace.allocate();
}

// Returns an unused sampler name
GLuint Context::createSampler()
{
	return mResourceManager->createSampler();
}

void Context::deleteBuffer(GLuint buffer)
{
	detachBuffer(buffer);

	mResourceManager->deleteBuffer(buffer);
}

void Context::deleteShader(GLuint shader)
{
	mResourceManager->deleteShader(shader);
}

void Context::deleteProgram(GLuint program)
{
	mResourceManager->deleteProgram(program);
}

void Context::deleteTexture(GLuint texture)
{
	detachTexture(texture);

	mResourceManager->deleteTexture(texture);
}

void Context::deleteRenderbuffer(GLuint renderbuffer)
{
	if(mResourceManager->getRenderbuffer(renderbuffer))
	{
		detachRenderbuffer(renderbuffer);
	}

	mResourceManager->deleteRenderbuffer(renderbuffer);
}

void Context::deleteFramebuffer(GLuint framebuffer)
{
	detachFramebuffer(framebuffer);

	Framebuffer *framebufferObject = mFramebufferNameSpace.remove(framebuffer);

	if(framebufferObject)
	{
		delete framebufferObject;
	}
}

void Context::deleteFence(GLuint fence)
{
	Fence *fenceObject = mFenceNameSpace.remove(fence);

	if(fenceObject)
	{
		delete fenceObject;
	}
}

void Context::deleteQuery(GLuint query)
{
	Query *queryObject = mQueryNameSpace.remove(query);

	if(queryObject)
	{
		queryObject->release();
	}
}

void Context::deleteVertexArray(GLuint vertexArray)
{
	// [OpenGL ES 3.0.2] section 2.10 page 43:
	// If a vertex array object that is currently bound is deleted, the binding
	// for that object reverts to zero and the default vertex array becomes current.
	if(getCurrentVertexArray()->name == vertexArray)
	{
		bindVertexArray(0);
	}

	VertexArray *vertexArrayObject = mVertexArrayNameSpace.remove(vertexArray);

	if(vertexArrayObject)
	{
		delete vertexArrayObject;
	}
}

void Context::deleteFenceSync(GLsync fenceSync)
{
	// The spec specifies the underlying Fence object is not deleted until all current
	// wait commands finish. However, since the name becomes invalid, we cannot query the fence,
	// and since our API is currently designed for being called from a single thread, we can delete
	// the fence immediately.
	mResourceManager->deleteFenceSync(static_cast<GLuint>(reinterpret_cast<uintptr_t>(fenceSync)));
}

void Context::deleteTransformFeedback(GLuint transformFeedback)
{
	TransformFeedback *transformFeedbackObject = mTransformFeedbackNameSpace.remove(transformFeedback);

	// Detach if currently bound.
	if(mState.transformFeedback == transformFeedback)
	{
		mState.transformFeedback = 0;
	}

	if(transformFeedbackObject)
	{
		delete transformFeedbackObject;
	}
}

void Context::deleteSampler(GLuint sampler)
{
	detachSampler(sampler);

	mResourceManager->deleteSampler(sampler);
}

Buffer *Context::getBuffer(GLuint handle) const
{
	return mResourceManager->getBuffer(handle);
}

Shader *Context::getShader(GLuint handle) const
{
	return mResourceManager->getShader(handle);
}

Program *Context::getProgram(GLuint handle) const
{
	return mResourceManager->getProgram(handle);
}

Texture *Context::getTexture(GLuint handle) const
{
	return mResourceManager->getTexture(handle);
}

Renderbuffer *Context::getRenderbuffer(GLuint handle) const
{
	return mResourceManager->getRenderbuffer(handle);
}

Framebuffer *Context::getReadFramebuffer() const
{
	return getFramebuffer(mState.readFramebuffer);
}

Framebuffer *Context::getDrawFramebuffer() const
{
	return getFramebuffer(mState.drawFramebuffer);
}

void Context::bindArrayBuffer(unsigned int buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.arrayBuffer = getBuffer(buffer);
}

void Context::bindElementArrayBuffer(unsigned int buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	getCurrentVertexArray()->setElementArrayBuffer(getBuffer(buffer));
}

void Context::bindCopyReadBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.copyReadBuffer = getBuffer(buffer);
}

void Context::bindCopyWriteBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.copyWriteBuffer = getBuffer(buffer);
}

void Context::bindPixelPackBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.pixelPackBuffer = getBuffer(buffer);
}

void Context::bindPixelUnpackBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.pixelUnpackBuffer = getBuffer(buffer);
}

void Context::bindTransformFeedbackBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.genericTransformFeedbackBuffer = getBuffer(buffer);
}

void Context::bindTexture(TextureType type, GLuint texture)
{
	mResourceManager->checkTextureAllocation(texture, type);

	mState.samplerTexture[type][mState.activeSampler] = getTexture(texture);
}

void Context::bindReadFramebuffer(GLuint framebuffer)
{
	if(!getFramebuffer(framebuffer))
	{
		if(framebuffer == 0)
		{
			mFramebufferNameSpace.insert(framebuffer, new DefaultFramebuffer());
		}
		else
		{
			mFramebufferNameSpace.insert(framebuffer, new Framebuffer());
		}
	}

	mState.readFramebuffer = framebuffer;
}

void Context::bindDrawFramebuffer(GLuint framebuffer)
{
	if(!getFramebuffer(framebuffer))
	{
		if(framebuffer == 0)
		{
			mFramebufferNameSpace.insert(framebuffer, new DefaultFramebuffer());
		}
		else
		{
			mFramebufferNameSpace.insert(framebuffer, new Framebuffer());
		}
	}

	mState.drawFramebuffer = framebuffer;
}

void Context::bindRenderbuffer(GLuint renderbuffer)
{
	mResourceManager->checkRenderbufferAllocation(renderbuffer);

	mState.renderbuffer = getRenderbuffer(renderbuffer);
}

void Context::bindVertexArray(GLuint array)
{
	VertexArray *vertexArray = getVertexArray(array);

	if(!vertexArray)
	{
		vertexArray = new VertexArray(array);
		mVertexArrayNameSpace.insert(array, vertexArray);
	}

	mState.vertexArray = array;
}

void Context::bindGenericUniformBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.genericUniformBuffer = getBuffer(buffer);
}

void Context::bindIndexedUniformBuffer(GLuint buffer, GLuint index, GLintptr offset, GLsizeiptr size)
{
	mResourceManager->checkBufferAllocation(buffer);

	Buffer* bufferObject = getBuffer(buffer);
	mState.uniformBuffers[index].set(bufferObject, static_cast<int>(offset), static_cast<int>(size));
}

void Context::bindGenericTransformFeedbackBuffer(GLuint buffer)
{
	mResourceManager->checkBufferAllocation(buffer);

	mState.genericTransformFeedbackBuffer = getBuffer(buffer);
}

void Context::bindIndexedTransformFeedbackBuffer(GLuint buffer, GLuint index, GLintptr offset, GLsizeiptr size)
{
	mResourceManager->checkBufferAllocation(buffer);

	Buffer* bufferObject = getBuffer(buffer);
	getTransformFeedback()->setBuffer(index, bufferObject, offset, size);
	mState.genericTransformFeedbackBuffer = bufferObject;
}

void Context::bindTransformFeedback(GLuint id)
{
	if(!getTransformFeedback(id))
	{
		mTransformFeedbackNameSpace.insert(id, new TransformFeedback(id));
	}

	mState.transformFeedback = id;
}

bool Context::bindSampler(GLuint unit, GLuint sampler)
{
	mResourceManager->checkSamplerAllocation(sampler);

	Sampler* samplerObject = getSampler(sampler);

	mState.sampler[unit] = samplerObject;

	return !!samplerObject;
}

void Context::useProgram(GLuint program)
{
	GLuint priorProgram = mState.currentProgram;
	mState.currentProgram = program;               // Must switch before trying to delete, otherwise it only gets flagged.

	if(priorProgram != program)
	{
		Program *newProgram = mResourceManager->getProgram(program);
		Program *oldProgram = mResourceManager->getProgram(priorProgram);

		if(newProgram)
		{
			newProgram->addRef();
		}

		if(oldProgram)
		{
			oldProgram->release();
		}
	}
}

void Context::beginQuery(GLenum target, GLuint query)
{
	// From EXT_occlusion_query_boolean: If BeginQueryEXT is called with an <id>
	// of zero, if the active query object name for <target> is non-zero (for the
	// targets ANY_SAMPLES_PASSED_EXT and ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, if
	// the active query for either target is non-zero), if <id> is the name of an
	// existing query object whose type does not match <target>, or if <id> is the
	// active query object name for any query type, the error INVALID_OPERATION is
	// generated.

	// Ensure no other queries are active
	// NOTE: If other queries than occlusion are supported, we will need to check
	// separately that:
	//    a) The query ID passed is not the current active query for any target/type
	//    b) There are no active queries for the requested target (and in the case
	//       of GL_ANY_SAMPLES_PASSED_EXT and GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
	//       no query may be active for either if glBeginQuery targets either.
	for(int i = 0; i < QUERY_TYPE_COUNT; i++)
	{
		if(mState.activeQuery[i])
		{
			switch(mState.activeQuery[i]->getType())
			{
			case GL_ANY_SAMPLES_PASSED_EXT:
			case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
				if((target == GL_ANY_SAMPLES_PASSED_EXT) ||
				   (target == GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT))
				{
					return error(GL_INVALID_OPERATION);
				}
				break;
			case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
				if(target == GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN)
				{
					return error(GL_INVALID_OPERATION);
				}
				break;
			default:
				break;
			}
		}
	}

	QueryType qType;
	switch(target)
	{
	case GL_ANY_SAMPLES_PASSED_EXT:
		qType = QUERY_ANY_SAMPLES_PASSED;
		break;
	case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
		qType = QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE;
		break;
	case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
		qType = QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN;
		break;
	default:
		UNREACHABLE(target);
		return error(GL_INVALID_ENUM);
	}

	Query *queryObject = createQuery(query, target);

	// Check that name was obtained with glGenQueries
	if(!queryObject)
	{
		return error(GL_INVALID_OPERATION);
	}

	// Check for type mismatch
	if(queryObject->getType() != target)
	{
		return error(GL_INVALID_OPERATION);
	}

	// Set query as active for specified target
	mState.activeQuery[qType] = queryObject;

	// Begin query
	queryObject->begin();
}

void Context::endQuery(GLenum target)
{
	QueryType qType;

	switch(target)
	{
	case GL_ANY_SAMPLES_PASSED_EXT:                qType = QUERY_ANY_SAMPLES_PASSED;                    break;
	case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:   qType = QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE;       break;
	case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: qType = QUERY_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN; break;
	default: UNREACHABLE(target); return;
	}

	Query *queryObject = mState.activeQuery[qType];

	if(!queryObject)
	{
		return error(GL_INVALID_OPERATION);
	}

	queryObject->end();

	mState.activeQuery[qType] = nullptr;
}

void Context::setFramebufferZero(Framebuffer *buffer)
{
	delete mFramebufferNameSpace.remove(0);
	mFramebufferNameSpace.insert(0, buffer);
}

void Context::setRenderbufferStorage(RenderbufferStorage *renderbuffer)
{
	Renderbuffer *renderbufferObject = mState.renderbuffer;
	renderbufferObject->setStorage(renderbuffer);
}

Framebuffer *Context::getFramebuffer(unsigned int handle) const
{
	return mFramebufferNameSpace.find(handle);
}

Fence *Context::getFence(unsigned int handle) const
{
	return mFenceNameSpace.find(handle);
}

FenceSync *Context::getFenceSync(GLsync handle) const
{
	return mResourceManager->getFenceSync(static_cast<GLuint>(reinterpret_cast<uintptr_t>(handle)));
}

Query *Context::getQuery(unsigned int handle) const
{
	return mQueryNameSpace.find(handle);
}

Query *Context::createQuery(unsigned int handle, GLenum type)
{
	if(!mQueryNameSpace.isReserved(handle))
	{
		return nullptr;
	}
	else
	{
		Query *query = mQueryNameSpace.find(handle);
		if(!query)
		{
			query = new Query(handle, type);
			query->addRef();
			mQueryNameSpace.insert(handle, query);
		}

		return query;
	}
}

VertexArray *Context::getVertexArray(GLuint array) const
{
	return mVertexArrayNameSpace.find(array);
}

VertexArray *Context::getCurrentVertexArray() const
{
	return getVertexArray(mState.vertexArray);
}

bool Context::isVertexArray(GLuint array) const
{
	return mVertexArrayNameSpace.isReserved(array);
}

bool Context::hasZeroDivisor() const
{
	// Verify there is at least one active attribute with a divisor of zero
	es2::Program *programObject = getCurrentProgram();
	for(int attributeIndex = 0; attributeIndex < MAX_VERTEX_ATTRIBS; attributeIndex++)
	{
		bool active = (programObject->getAttributeStream(attributeIndex) != -1);
		if(active && getCurrentVertexArray()->getVertexAttribute(attributeIndex).mDivisor == 0)
		{
			return true;
		}
	}

	return false;
}

TransformFeedback *Context::getTransformFeedback(GLuint transformFeedback) const
{
	return mTransformFeedbackNameSpace.find(transformFeedback);
}

bool Context::isTransformFeedback(GLuint array) const
{
	return mTransformFeedbackNameSpace.isReserved(array);
}

Sampler *Context::getSampler(GLuint sampler) const
{
	return mResourceManager->getSampler(sampler);
}

bool Context::isSampler(GLuint sampler) const
{
	return mResourceManager->isSampler(sampler);
}

Buffer *Context::getArrayBuffer() const
{
	return mState.arrayBuffer;
}

Buffer *Context::getElementArrayBuffer() const
{
	return getCurrentVertexArray()->getElementArrayBuffer();
}

Buffer *Context::getCopyReadBuffer() const
{
	return mState.copyReadBuffer;
}

Buffer *Context::getCopyWriteBuffer() const
{
	return mState.copyWriteBuffer;
}

Buffer *Context::getPixelPackBuffer() const
{
	return mState.pixelPackBuffer;
}

Buffer *Context::getPixelUnpackBuffer() const
{
	return mState.pixelUnpackBuffer;
}

Buffer *Context::getGenericUniformBuffer() const
{
	return mState.genericUniformBuffer;
}

// The "required buffer size" is the number of bytes from the start of the
// buffer to the last byte referenced within the buffer. If the caller of this
// function has to worry about offsets within the buffer, it only needs to add
// that byte offset to this function's return value to get its required buffer
// size.
size_t Context::getRequiredBufferSize(GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type) const
{
	// 0-dimensional images have no bytes in them.
	if (width == 0 || height == 0 || depth == 0)
	{
		return 0;
	}

	GLint pixelsPerRow = (mState.unpackParameters.rowLength) > 0 ? mState.unpackParameters.rowLength : width;
	GLint rowsPerImage = (mState.unpackParameters.imageHeight) > 0 ? mState.unpackParameters.imageHeight : height;

	GLint bytesPerPixel = gl::ComputePixelSize(format, type);
	GLint bytesPerRow = gl::ComputePitch(pixelsPerRow, format, type, mState.unpackParameters.alignment);
	GLint bytesPerImage = rowsPerImage * bytesPerRow;

	// Depth and height are subtracted by 1, while width is not, because we're not
	// reading the full last row or image, but we are reading the full last pixel.
	return (mState.unpackParameters.skipImages + (depth - 1))  * bytesPerImage
		 + (mState.unpackParameters.skipRows   + (height - 1)) * bytesPerRow
		 + (mState.unpackParameters.skipPixels + (width))      * bytesPerPixel;
}

GLenum Context::getPixels(const GLvoid **pixels, GLenum type, size_t imageSize) const
{
	if(mState.pixelUnpackBuffer)
	{
		ASSERT(mState.pixelUnpackBuffer->name != 0);

		if(mState.pixelUnpackBuffer->isMapped())
		{
			return GL_INVALID_OPERATION;
		}

		size_t offset = static_cast<size_t>((ptrdiff_t)(*pixels));

		if(offset % GetTypeSize(type) != 0)
		{
			return GL_INVALID_OPERATION;
		}

		if(offset > mState.pixelUnpackBuffer->size())
		{
			return GL_INVALID_OPERATION;
		}

		if(mState.pixelUnpackBuffer->size() - offset < imageSize)
		{
			return GL_INVALID_OPERATION;
		}

		*pixels = static_cast<const unsigned char*>(mState.pixelUnpackBuffer->data()) + offset;
	}

	return GL_NO_ERROR;
}

bool Context::getBuffer(GLenum target, es2::Buffer **buffer) const
{
	switch(target)
	{
	case GL_ARRAY_BUFFER:
		*buffer = getArrayBuffer();
		break;
	case GL_ELEMENT_ARRAY_BUFFER:
		*buffer = getElementArrayBuffer();
		break;
	case GL_COPY_READ_BUFFER:
		*buffer = getCopyReadBuffer();
		break;
	case GL_COPY_WRITE_BUFFER:
		*buffer = getCopyWriteBuffer();
		break;
	case GL_PIXEL_PACK_BUFFER:
		*buffer = getPixelPackBuffer();
		break;
	case GL_PIXEL_UNPACK_BUFFER:
		*buffer = getPixelUnpackBuffer();
		break;
	case GL_TRANSFORM_FEEDBACK_BUFFER:
		*buffer = static_cast<es2::Buffer*>(mState.genericTransformFeedbackBuffer);
		break;
	case GL_UNIFORM_BUFFER:
		*buffer = getGenericUniformBuffer();
		break;
	default:
		return false;
	}
	return true;
}

TransformFeedback *Context::getTransformFeedback() const
{
	return getTransformFeedback(mState.transformFeedback);
}

Program *Context::getCurrentProgram() const
{
	return mResourceManager->getProgram(mState.currentProgram);
}

Texture *Context::getTargetTexture(GLenum target) const
{
	Texture *texture = nullptr;

	switch(target)
	{
	case GL_TEXTURE_2D:            texture = getTexture2D();       break;
	case GL_TEXTURE_2D_ARRAY:      texture = getTexture2DArray();  break;
	case GL_TEXTURE_3D:            texture = getTexture3D();       break;
	case GL_TEXTURE_CUBE_MAP:      texture = getTextureCubeMap();  break;
	case GL_TEXTURE_EXTERNAL_OES:  texture = getTextureExternal(); break;
	case GL_TEXTURE_RECTANGLE_ARB: texture = getTexture2DRect();   break;
	default:
		return error(GL_INVALID_ENUM, nullptr);
	}

	ASSERT(texture);  // Must always have a default texture to fall back to.

	return texture;
}

Texture2D *Context::getTexture2D() const
{
	return static_cast<Texture2D*>(getSamplerTexture(mState.activeSampler, TEXTURE_2D));
}

Texture2D *Context::getTexture2D(GLenum target) const
{
	switch(target)
	{
	case GL_TEXTURE_2D:            return getTexture2D();
	case GL_TEXTURE_RECTANGLE_ARB: return getTexture2DRect();
	case GL_TEXTURE_EXTERNAL_OES:  return getTextureExternal();
	default:                       UNREACHABLE(target);
	}

	return nullptr;
}

Texture3D *Context::getTexture3D() const
{
	return static_cast<Texture3D*>(getSamplerTexture(mState.activeSampler, TEXTURE_3D));
}

Texture2DArray *Context::getTexture2DArray() const
{
	return static_cast<Texture2DArray*>(getSamplerTexture(mState.activeSampler, TEXTURE_2D_ARRAY));
}

TextureCubeMap *Context::getTextureCubeMap() const
{
	return static_cast<TextureCubeMap*>(getSamplerTexture(mState.activeSampler, TEXTURE_CUBE));
}

Texture2DRect *Context::getTexture2DRect() const
{
	return static_cast<Texture2DRect*>(getSamplerTexture(mState.activeSampler, TEXTURE_2D_RECT));
}

TextureExternal *Context::getTextureExternal() const
{
	return static_cast<TextureExternal*>(getSamplerTexture(mState.activeSampler, TEXTURE_EXTERNAL));
}

Texture *Context::getSamplerTexture(unsigned int sampler, TextureType type) const
{
	GLuint texid = mState.samplerTexture[type][sampler].name();

	if(texid == 0)   // Special case: 0 refers to different initial textures based on the target
	{
		switch(type)
		{
		case TEXTURE_2D: return mTexture2DZero;
		case TEXTURE_3D: return mTexture3DZero;
		case TEXTURE_2D_ARRAY: return mTexture2DArrayZero;
		case TEXTURE_CUBE: return mTextureCubeMapZero;
		case TEXTURE_2D_RECT: return mTexture2DRectZero;
		case TEXTURE_EXTERNAL: return mTextureExternalZero;
		default: UNREACHABLE(type);
		}
	}

	return mState.samplerTexture[type][sampler];
}

void Context::samplerParameteri(GLuint sampler, GLenum pname, GLint param)
{
	mResourceManager->checkSamplerAllocation(sampler);

	Sampler *samplerObject = getSampler(sampler);
	ASSERT(samplerObject);

	switch(pname)
	{
	case GL_TEXTURE_MIN_FILTER:         samplerObject->setMinFilter(static_cast<GLenum>(param));      break;
	case GL_TEXTURE_MAG_FILTER:         samplerObject->setMagFilter(static_cast<GLenum>(param));      break;
	case GL_TEXTURE_WRAP_S:             samplerObject->setWrapS(static_cast<GLenum>(param));          break;
	case GL_TEXTURE_WRAP_T:             samplerObject->setWrapT(static_cast<GLenum>(param));          break;
	case GL_TEXTURE_WRAP_R:             samplerObject->setWrapR(static_cast<GLenum>(param));          break;
	case GL_TEXTURE_MIN_LOD:            samplerObject->setMinLod(static_cast<GLfloat>(param));        break;
	case GL_TEXTURE_MAX_LOD:            samplerObject->setMaxLod(static_cast<GLfloat>(param));        break;
	case GL_TEXTURE_COMPARE_MODE:       samplerObject->setCompareMode(static_cast<GLenum>(param));    break;
	case GL_TEXTURE_COMPARE_FUNC:       samplerObject->setCompareFunc(static_cast<GLenum>(param));    break;
	case GL_TEXTURE_MAX_ANISOTROPY_EXT: samplerObject->setMaxAnisotropy(static_cast<GLfloat>(param)); break;
	default:                            UNREACHABLE(pname); break;
	}
}

void Context::samplerParameterf(GLuint sampler, GLenum pname, GLfloat param)
{
	mResourceManager->checkSamplerAllocation(sampler);

	Sampler *samplerObject = getSampler(sampler);
	ASSERT(samplerObject);

	switch(pname)
	{
	case GL_TEXTURE_MIN_FILTER:         samplerObject->setMinFilter(static_cast<GLenum>(roundf(param)));   break;
	case GL_TEXTURE_MAG_FILTER:         samplerObject->setMagFilter(static_cast<GLenum>(roundf(param)));   break;
	case GL_TEXTURE_WRAP_S:             samplerObject->setWrapS(static_cast<GLenum>(roundf(param)));       break;
	case GL_TEXTURE_WRAP_T:             samplerObject->setWrapT(static_cast<GLenum>(roundf(param)));       break;
	case GL_TEXTURE_WRAP_R:             samplerObject->setWrapR(static_cast<GLenum>(roundf(param)));       break;
	case GL_TEXTURE_MIN_LOD:            samplerObject->setMinLod(param);                                   break;
	case GL_TEXTURE_MAX_LOD:            samplerObject->setMaxLod(param);                                   break;
	case GL_TEXTURE_COMPARE_MODE:       samplerObject->setCompareMode(static_cast<GLenum>(roundf(param))); break;
	case GL_TEXTURE_COMPARE_FUNC:       samplerObject->setCompareFunc(static_cast<GLenum>(roundf(param))); break;
	case GL_TEXTURE_MAX_ANISOTROPY_EXT: samplerObject->setMaxAnisotropy(param);                            break;
	default:                            UNREACHABLE(pname); break;
	}
}

GLint Context::getSamplerParameteri(GLuint sampler, GLenum pname)
{
	mResourceManager->checkSamplerAllocation(sampler);

	Sampler *samplerObject = getSampler(sampler);
	ASSERT(samplerObject);

	switch(pname)
	{
	case GL_TEXTURE_MIN_FILTER:         return static_cast<GLint>(samplerObject->getMinFilter());
	case GL_TEXTURE_MAG_FILTER:         return static_cast<GLint>(samplerObject->getMagFilter());
	case GL_TEXTURE_WRAP_S:             return static_cast<GLint>(samplerObject->getWrapS());
	case GL_TEXTURE_WRAP_T:             return static_cast<GLint>(samplerObject->getWrapT());
	case GL_TEXTURE_WRAP_R:             return static_cast<GLint>(samplerObject->getWrapR());
	case GL_TEXTURE_MIN_LOD:            return static_cast<GLint>(roundf(samplerObject->getMinLod()));
	case GL_TEXTURE_MAX_LOD:            return static_cast<GLint>(roundf(samplerObject->getMaxLod()));
	case GL_TEXTURE_COMPARE_MODE:       return static_cast<GLint>(samplerObject->getCompareMode());
	case GL_TEXTURE_COMPARE_FUNC:       return static_cast<GLint>(samplerObject->getCompareFunc());
	case GL_TEXTURE_MAX_ANISOTROPY_EXT: return static_cast<GLint>(samplerObject->getMaxAnisotropy());
	default:                            UNREACHABLE(pname); return 0;
	}
}

GLfloat Context::getSamplerParameterf(GLuint sampler, GLenum pname)
{
	mResourceManager->checkSamplerAllocation(sampler);

	Sampler *samplerObject = getSampler(sampler);
	ASSERT(samplerObject);

	switch(pname)
	{
	case GL_TEXTURE_MIN_FILTER:         return static_cast<GLfloat>(samplerObject->getMinFilter());
	case GL_TEXTURE_MAG_FILTER:         return static_cast<GLfloat>(samplerObject->getMagFilter());
	case GL_TEXTURE_WRAP_S:             return static_cast<GLfloat>(samplerObject->getWrapS());
	case GL_TEXTURE_WRAP_T:             return static_cast<GLfloat>(samplerObject->getWrapT());
	case GL_TEXTURE_WRAP_R:             return static_cast<GLfloat>(samplerObject->getWrapR());
	case GL_TEXTURE_MIN_LOD:            return samplerObject->getMinLod();
	case GL_TEXTURE_MAX_LOD:            return samplerObject->getMaxLod();
	case GL_TEXTURE_COMPARE_MODE:       return static_cast<GLfloat>(samplerObject->getCompareMode());
	case GL_TEXTURE_COMPARE_FUNC:       return static_cast<GLfloat>(samplerObject->getCompareFunc());
	case GL_TEXTURE_MAX_ANISOTROPY_EXT: return samplerObject->getMaxAnisotropy();
	default:                            UNREACHABLE(pname); return 0;
	}
}

bool Context::getBooleanv(GLenum pname, GLboolean *params) const
{
	switch(pname)
	{
	case GL_SHADER_COMPILER:          *params = GL_TRUE;                          break;
	case GL_SAMPLE_COVERAGE_INVERT:   *params = mState.sampleCoverageInvert;      break;
	case GL_DEPTH_WRITEMASK:          *params = mState.depthMask;                 break;
	case GL_COLOR_WRITEMASK:
		params[0] = mState.colorMaskRed;
		params[1] = mState.colorMaskGreen;
		params[2] = mState.colorMaskBlue;
		params[3] = mState.colorMaskAlpha;
		break;
	case GL_CULL_FACE:                *params = mState.cullFaceEnabled;                  break;
	case GL_POLYGON_OFFSET_FILL:      *params = mState.polygonOffsetFillEnabled;         break;
	case GL_SAMPLE_ALPHA_TO_COVERAGE: *params = mState.sampleAlphaToCoverageEnabled;     break;
	case GL_SAMPLE_COVERAGE:          *params = mState.sampleCoverageEnabled;            break;
	case GL_SCISSOR_TEST:             *params = mState.scissorTestEnabled;               break;
	case GL_STENCIL_TEST:             *params = mState.stencilTestEnabled;               break;
	case GL_DEPTH_TEST:               *params = mState.depthTestEnabled;                 break;
	case GL_BLEND:                    *params = mState.blendEnabled;                     break;
	case GL_DITHER:                   *params = mState.ditherEnabled;                    break;
	case GL_PRIMITIVE_RESTART_FIXED_INDEX: *params = mState.primitiveRestartFixedIndexEnabled; break;
	case GL_RASTERIZER_DISCARD:       *params = mState.rasterizerDiscardEnabled;         break;
	case GL_TRANSFORM_FEEDBACK_ACTIVE:
		{
			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
			if(transformFeedback)
			{
				*params = transformFeedback->isActive();
				break;
			}
			else return false;
		}
	 case GL_TRANSFORM_FEEDBACK_PAUSED:
		{
			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
			if(transformFeedback)
			{
				*params = transformFeedback->isPaused();
				break;
			}
			else return false;
		}
	default:
		return false;
	}

	return true;
}

bool Context::getFloatv(GLenum pname, GLfloat *params) const
{
	// Please note: DEPTH_CLEAR_VALUE is included in our internal getFloatv implementation
	// because it is stored as a float, despite the fact that the GL ES 2.0 spec names
	// GetIntegerv as its native query function. As it would require conversion in any
	// case, this should make no difference to the calling application.
	switch(pname)
	{
	case GL_LINE_WIDTH:               *params = mState.lineWidth;            break;
	case GL_SAMPLE_COVERAGE_VALUE:    *params = mState.sampleCoverageValue;  break;
	case GL_DEPTH_CLEAR_VALUE:        *params = mState.depthClearValue;      break;
	case GL_POLYGON_OFFSET_FACTOR:    *params = mState.polygonOffsetFactor;  break;
	case GL_POLYGON_OFFSET_UNITS:     *params = mState.polygonOffsetUnits;   break;
	case GL_ALIASED_LINE_WIDTH_RANGE:
		params[0] = ALIASED_LINE_WIDTH_RANGE_MIN;
		params[1] = ALIASED_LINE_WIDTH_RANGE_MAX;
		break;
	case GL_ALIASED_POINT_SIZE_RANGE:
		params[0] = ALIASED_POINT_SIZE_RANGE_MIN;
		params[1] = ALIASED_POINT_SIZE_RANGE_MAX;
		break;
	case GL_DEPTH_RANGE:
		params[0] = mState.zNear;
		params[1] = mState.zFar;
		break;
	case GL_COLOR_CLEAR_VALUE:
		params[0] = mState.colorClearValue.red;
		params[1] = mState.colorClearValue.green;
		params[2] = mState.colorClearValue.blue;
		params[3] = mState.colorClearValue.alpha;
		break;
	case GL_BLEND_COLOR:
		params[0] = mState.blendColor.red;
		params[1] = mState.blendColor.green;
		params[2] = mState.blendColor.blue;
		params[3] = mState.blendColor.alpha;
		break;
	case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
		*params = MAX_TEXTURE_MAX_ANISOTROPY;
		break;
	default:
		return false;
	}

	return true;
}

template bool Context::getIntegerv<GLint>(GLenum pname, GLint *params) const;
template bool Context::getIntegerv<GLint64>(GLenum pname, GLint64 *params) const;

template<typename T> bool Context::getIntegerv(GLenum pname, T *params) const
{
	// Please note: DEPTH_CLEAR_VALUE is not included in our internal getIntegerv implementation
	// because it is stored as a float, despite the fact that the GL ES 2.0 spec names
	// GetIntegerv as its native query function. As it would require conversion in any
	// case, this should make no difference to the calling application. You may find it in
	// Context::getFloatv.
	switch(pname)
	{
	case GL_MAX_VERTEX_ATTRIBS:               *params = MAX_VERTEX_ATTRIBS;               return true;
	case GL_MAX_VERTEX_UNIFORM_VECTORS:       *params = MAX_VERTEX_UNIFORM_VECTORS;       return true;
	case GL_MAX_VARYING_VECTORS:              *params = MAX_VARYING_VECTORS;              return true;
	case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: *params = MAX_COMBINED_TEXTURE_IMAGE_UNITS; return true;
	case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:   *params = MAX_VERTEX_TEXTURE_IMAGE_UNITS;   return true;
	case GL_MAX_TEXTURE_IMAGE_UNITS:          *params = MAX_TEXTURE_IMAGE_UNITS;          return true;
	case GL_MAX_FRAGMENT_UNIFORM_VECTORS:     *params = MAX_FRAGMENT_UNIFORM_VECTORS;     return true;
	case GL_MAX_RENDERBUFFER_SIZE:            *params = IMPLEMENTATION_MAX_RENDERBUFFER_SIZE; return true;
	case GL_NUM_SHADER_BINARY_FORMATS:        *params = 0;                                    return true;
	case GL_SHADER_BINARY_FORMATS:      /* no shader binary formats are supported */          return true;
	case GL_ARRAY_BUFFER_BINDING:             *params = getArrayBufferName();                 return true;
	case GL_ELEMENT_ARRAY_BUFFER_BINDING:     *params = getElementArrayBufferName();          return true;
//	case GL_FRAMEBUFFER_BINDING:            // now equivalent to GL_DRAW_FRAMEBUFFER_BINDING_ANGLE
	case GL_DRAW_FRAMEBUFFER_BINDING:         *params = mState.drawFramebuffer;               return true;
	case GL_READ_FRAMEBUFFER_BINDING:         *params = mState.readFramebuffer;               return true;
	case GL_RENDERBUFFER_BINDING:             *params = mState.renderbuffer.name();           return true;
	case GL_CURRENT_PROGRAM:                  *params = mState.currentProgram;                return true;
	case GL_PACK_ALIGNMENT:                   *params = mState.packParameters.alignment;                 return true;
	case GL_UNPACK_ALIGNMENT:                 *params = mState.unpackParameters.alignment;          return true;
	case GL_GENERATE_MIPMAP_HINT:             *params = mState.generateMipmapHint;            return true;
	case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES: *params = mState.fragmentShaderDerivativeHint; return true;
	case GL_TEXTURE_FILTERING_HINT_CHROMIUM:  *params = mState.textureFilteringHint;          return true;
	case GL_ACTIVE_TEXTURE:                   *params = (mState.activeSampler + GL_TEXTURE0); return true;
	case GL_STENCIL_FUNC:                     *params = mState.stencilFunc;                   return true;
	case GL_STENCIL_REF:                      *params = mState.stencilRef;                    return true;
	case GL_STENCIL_VALUE_MASK:               *params = sw::clampToSignedInt(mState.stencilMask); return true;
	case GL_STENCIL_BACK_FUNC:                *params = mState.stencilBackFunc;               return true;
	case GL_STENCIL_BACK_REF:                 *params = mState.stencilBackRef;                return true;
	case GL_STENCIL_BACK_VALUE_MASK:          *params = sw::clampToSignedInt(mState.stencilBackMask); return true;
	case GL_STENCIL_FAIL:                     *params = mState.stencilFail;                   return true;
	case GL_STENCIL_PASS_DEPTH_FAIL:          *params = mState.stencilPassDepthFail;          return true;
	case GL_STENCIL_PASS_DEPTH_PASS:          *params = mState.stencilPassDepthPass;          return true;
	case GL_STENCIL_BACK_FAIL:                *params = mState.stencilBackFail;               return true;
	case GL_STENCIL_BACK_PASS_DEPTH_FAIL:     *params = mState.stencilBackPassDepthFail;      return true;
	case GL_STENCIL_BACK_PASS_DEPTH_PASS:     *params = mState.stencilBackPassDepthPass;      return true;
	case GL_DEPTH_FUNC:                       *params = mState.depthFunc;                     return true;
	case GL_BLEND_SRC_RGB:                    *params = mState.sourceBlendRGB;                return true;
	case GL_BLEND_SRC_ALPHA:                  *params = mState.sourceBlendAlpha;              return true;
	case GL_BLEND_DST_RGB:                    *params = mState.destBlendRGB;                  return true;
	case GL_BLEND_DST_ALPHA:                  *params = mState.destBlendAlpha;                return true;
	case GL_BLEND_EQUATION_RGB:               *params = mState.blendEquationRGB;              return true;
	case GL_BLEND_EQUATION_ALPHA:             *params = mState.blendEquationAlpha;            return true;
	case GL_STENCIL_WRITEMASK:                *params = sw::clampToSignedInt(mState.stencilWritemask); return true;
	case GL_STENCIL_BACK_WRITEMASK:           *params = sw::clampToSignedInt(mState.stencilBackWritemask); return true;
	case GL_STENCIL_CLEAR_VALUE:              *params = mState.stencilClearValue;             return true;
	case GL_SUBPIXEL_BITS:                    *params = 4;                                    return true;
	case GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB:
	case GL_MAX_TEXTURE_SIZE:                 *params = IMPLEMENTATION_MAX_TEXTURE_SIZE;          return true;
	case GL_MAX_CUBE_MAP_TEXTURE_SIZE:        *params = IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE; return true;
	case GL_NUM_COMPRESSED_TEXTURE_FORMATS:   *params = NUM_COMPRESSED_TEXTURE_FORMATS;           return true;
	case GL_MAX_SAMPLES:                      *params = IMPLEMENTATION_MAX_SAMPLES;               return true;
	case GL_SAMPLE_BUFFERS:
	case GL_SAMPLES:
		{
			Framebuffer *framebuffer = getDrawFramebuffer();
			int width, height, samples;

			if(framebuffer && (framebuffer->completeness(width, height, samples) == GL_FRAMEBUFFER_COMPLETE))
			{
				switch(pname)
				{
				case GL_SAMPLE_BUFFERS:
					if(samples > 1)
					{
						*params = 1;
					}
					else
					{
						*params = 0;
					}
					break;
				case GL_SAMPLES:
					*params = samples;
					break;
				}
			}
			else
			{
				*params = 0;
			}
		}
		return true;
	case GL_IMPLEMENTATION_COLOR_READ_TYPE:
		{
			Framebuffer *framebuffer = getReadFramebuffer();
			if(framebuffer)
			{
				*params = framebuffer->getImplementationColorReadType();
			}
			else
			{
				return error(GL_INVALID_OPERATION, true);
			}
		}
		return true;
	case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
		{
			Framebuffer *framebuffer = getReadFramebuffer();
			if(framebuffer)
			{
				*params = framebuffer->getImplementationColorReadFormat();
			}
			else
			{
				return error(GL_INVALID_OPERATION, true);
			}
		}
		return true;
	case GL_MAX_VIEWPORT_DIMS:
		{
			int maxDimension = IMPLEMENTATION_MAX_RENDERBUFFER_SIZE;
			params[0] = maxDimension;
			params[1] = maxDimension;
		}
		return true;
	case GL_COMPRESSED_TEXTURE_FORMATS:
		{
			for(int i = 0; i < NUM_COMPRESSED_TEXTURE_FORMATS; i++)
			{
				params[i] = compressedTextureFormats[i];
			}
		}
		return true;
	case GL_VIEWPORT:
		params[0] = mState.viewportX;
		params[1] = mState.viewportY;
		params[2] = mState.viewportWidth;
		params[3] = mState.viewportHeight;
		return true;
	case GL_SCISSOR_BOX:
		params[0] = mState.scissorX;
		params[1] = mState.scissorY;
		params[2] = mState.scissorWidth;
		params[3] = mState.scissorHeight;
		return true;
	case GL_CULL_FACE_MODE:                   *params = mState.cullMode;                 return true;
	case GL_FRONT_FACE:                       *params = mState.frontFace;                return true;
	case GL_RED_BITS:
	case GL_GREEN_BITS:
	case GL_BLUE_BITS:
	case GL_ALPHA_BITS:
		{
			Framebuffer *framebuffer = getDrawFramebuffer();
			Renderbuffer *colorbuffer = framebuffer ? framebuffer->getColorbuffer(0) : nullptr;

			if(colorbuffer)
			{
				switch(pname)
				{
				case GL_RED_BITS:   *params = colorbuffer->getRedSize();   return true;
				case GL_GREEN_BITS: *params = colorbuffer->getGreenSize(); return true;
				case GL_BLUE_BITS:  *params = colorbuffer->getBlueSize();  return true;
				case GL_ALPHA_BITS: *params = colorbuffer->getAlphaSize(); return true;
				}
			}
			else
			{
				*params = 0;
			}
		}
		return true;
	case GL_DEPTH_BITS:
		{
			Framebuffer *framebuffer = getDrawFramebuffer();
			Renderbuffer *depthbuffer = framebuffer ? framebuffer->getDepthbuffer() : nullptr;

			if(depthbuffer)
			{
				*params = depthbuffer->getDepthSize();
			}
			else
			{
				*params = 0;
			}
		}
		return true;
	case GL_STENCIL_BITS:
		{
			Framebuffer *framebuffer = getDrawFramebuffer();
			Renderbuffer *stencilbuffer = framebuffer ? framebuffer->getStencilbuffer() : nullptr;

			if(stencilbuffer)
			{
				*params = stencilbuffer->getStencilSize();
			}
			else
			{
				*params = 0;
			}
		}
		return true;
	case GL_TEXTURE_BINDING_2D:
		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
		{
			error(GL_INVALID_OPERATION);
			return false;
		}

		*params = mState.samplerTexture[TEXTURE_2D][mState.activeSampler].name();
		return true;
	case GL_TEXTURE_BINDING_CUBE_MAP:
		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
		{
			error(GL_INVALID_OPERATION);
			return false;
		}

		*params = mState.samplerTexture[TEXTURE_CUBE][mState.activeSampler].name();
		return true;
	case GL_TEXTURE_BINDING_RECTANGLE_ARB:
		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
		{
			error(GL_INVALID_OPERATION);
			return false;
		}

		*params = mState.samplerTexture[TEXTURE_2D_RECT][mState.activeSampler].name();
		return true;
	case GL_TEXTURE_BINDING_EXTERNAL_OES:
		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
		{
			error(GL_INVALID_OPERATION);
			return false;
		}

		*params = mState.samplerTexture[TEXTURE_EXTERNAL][mState.activeSampler].name();
		return true;
	case GL_TEXTURE_BINDING_3D_OES:
		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
		{
			error(GL_INVALID_OPERATION);
			return false;
		}

		*params = mState.samplerTexture[TEXTURE_3D][mState.activeSampler].name();
		return true;
	case GL_DRAW_BUFFER0:
	case GL_DRAW_BUFFER1:
	case GL_DRAW_BUFFER2:
	case GL_DRAW_BUFFER3:
	case GL_DRAW_BUFFER4:
	case GL_DRAW_BUFFER5:
	case GL_DRAW_BUFFER6:
	case GL_DRAW_BUFFER7:
	case GL_DRAW_BUFFER8:
	case GL_DRAW_BUFFER9:
	case GL_DRAW_BUFFER10:
	case GL_DRAW_BUFFER11:
	case GL_DRAW_BUFFER12:
	case GL_DRAW_BUFFER13:
	case GL_DRAW_BUFFER14:
	case GL_DRAW_BUFFER15:
		if((pname - GL_DRAW_BUFFER0) < MAX_DRAW_BUFFERS)
		{
			Framebuffer* framebuffer = getDrawFramebuffer();
			*params = framebuffer ? framebuffer->getDrawBuffer(pname - GL_DRAW_BUFFER0) : GL_NONE;
		}
		else
		{
			return false;
		}
		return true;
	case GL_MAX_DRAW_BUFFERS:
		*params = MAX_DRAW_BUFFERS;
		return true;
	case GL_MAX_COLOR_ATTACHMENTS: // Note: MAX_COLOR_ATTACHMENTS_EXT added by GL_EXT_draw_buffers
		*params = MAX_COLOR_ATTACHMENTS;
		return true;
	case GL_TEXTURE_BINDING_2D_ARRAY:
		if(mState.activeSampler > MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
		{
			error(GL_INVALID_OPERATION);
			return false;
		}

		*params = mState.samplerTexture[TEXTURE_2D_ARRAY][mState.activeSampler].name();
		return true;
	case GL_COPY_READ_BUFFER_BINDING:
		*params = mState.copyReadBuffer.name();
		return true;
	case GL_COPY_WRITE_BUFFER_BINDING:
		*params = mState.copyWriteBuffer.name();
		return true;
	case GL_MAJOR_VERSION:
		*params = 3;
		return true;
	case GL_MINOR_VERSION:
		*params = 0;
		return true;
	case GL_MAX_3D_TEXTURE_SIZE:
		*params = IMPLEMENTATION_MAX_3D_TEXTURE_SIZE;
		return true;
	case GL_MAX_ARRAY_TEXTURE_LAYERS:
		*params = IMPLEMENTATION_MAX_TEXTURE_SIZE;
		return true;
	case GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
		*params = MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS;
		return true;
	case GL_MAX_COMBINED_UNIFORM_BLOCKS:
		*params = MAX_VERTEX_UNIFORM_BLOCKS + MAX_FRAGMENT_UNIFORM_BLOCKS;
		return true;
	case GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:
		*params = MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS;
		return true;
	case GL_MAX_ELEMENT_INDEX:
		*params = MAX_ELEMENT_INDEX;
		return true;
	case GL_MAX_ELEMENTS_INDICES:
		*params = MAX_ELEMENTS_INDICES;
		return true;
	case GL_MAX_ELEMENTS_VERTICES:
		*params = MAX_ELEMENTS_VERTICES;
		return true;
	case GL_MAX_FRAGMENT_INPUT_COMPONENTS:
		*params = MAX_FRAGMENT_INPUT_VECTORS * 4;
		return true;
	case GL_MAX_FRAGMENT_UNIFORM_BLOCKS:
		*params = MAX_FRAGMENT_UNIFORM_BLOCKS;
		return true;
	case GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
		*params = MAX_FRAGMENT_UNIFORM_COMPONENTS;
		return true;
	case GL_MAX_PROGRAM_TEXEL_OFFSET:
		// Note: SwiftShader has no actual texel offset limit, so this limit can be modified if required.
		// In any case, any behavior outside the specified range is valid since the spec mentions:
		// (see OpenGL ES 3.0.5, 3.8.10.1 Scale Factor and Level of Detail, p.153)
		// "If any of the offset values are outside the range of the  implementation-defined values
		//  MIN_PROGRAM_TEXEL_OFFSET and MAX_PROGRAM_TEXEL_OFFSET, results of the texture lookup are
		//  undefined."
		*params = MAX_PROGRAM_TEXEL_OFFSET;
		return true;
	case GL_MAX_SERVER_WAIT_TIMEOUT:
		*params = 0;
		return true;
	case GL_MAX_TEXTURE_LOD_BIAS:
		*params = MAX_TEXTURE_LOD_BIAS;
		return true;
	case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
		*params = sw::MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS;
		return true;
	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:
		*params = MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS;
		return true;
	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:
		*params = sw::MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS;
		return true;
	case GL_MAX_UNIFORM_BLOCK_SIZE:
		*params = MAX_UNIFORM_BLOCK_SIZE;
		return true;
	case GL_MAX_UNIFORM_BUFFER_BINDINGS:
		*params = MAX_UNIFORM_BUFFER_BINDINGS;
		return true;
	case GL_MAX_VARYING_COMPONENTS:
		*params = MAX_VARYING_VECTORS * 4;
		return true;
	case GL_MAX_VERTEX_OUTPUT_COMPONENTS:
		*params = MAX_VERTEX_OUTPUT_VECTORS * 4;
		return true;
	case GL_MAX_VERTEX_UNIFORM_BLOCKS:
		*params = MAX_VERTEX_UNIFORM_BLOCKS;
		return true;
	case GL_MAX_VERTEX_UNIFORM_COMPONENTS:
		*params = MAX_VERTEX_UNIFORM_COMPONENTS;
		return true;
	case GL_MIN_PROGRAM_TEXEL_OFFSET:
		// Note: SwiftShader has no actual texel offset limit, so this limit can be modified if required.
		// In any case, any behavior outside the specified range is valid since the spec mentions:
		// (see OpenGL ES 3.0.5, 3.8.10.1 Scale Factor and Level of Detail, p.153)
		// "If any of the offset values are outside the range of the  implementation-defined values
		//  MIN_PROGRAM_TEXEL_OFFSET and MAX_PROGRAM_TEXEL_OFFSET, results of the texture lookup are
		//  undefined."
		*params = MIN_PROGRAM_TEXEL_OFFSET;
		return true;
	case GL_NUM_EXTENSIONS:
		GLuint numExtensions;
		getExtensions(0, &numExtensions);
		*params = numExtensions;
		return true;
	case GL_NUM_PROGRAM_BINARY_FORMATS:
		*params = NUM_PROGRAM_BINARY_FORMATS;
		return true;
	case GL_PACK_ROW_LENGTH:
		*params = mState.packParameters.rowLength;
		return true;
	case GL_PACK_SKIP_PIXELS:
		*params = mState.packParameters.skipPixels;
		return true;
	case GL_PACK_SKIP_ROWS:
		*params = mState.packParameters.skipRows;
		return true;
	case GL_PIXEL_PACK_BUFFER_BINDING:
		*params = mState.pixelPackBuffer.name();
		return true;
	case GL_PIXEL_UNPACK_BUFFER_BINDING:
		*params = mState.pixelUnpackBuffer.name();
		return true;
	case GL_PROGRAM_BINARY_FORMATS:
		// Since NUM_PROGRAM_BINARY_FORMATS is 0, the input
		// should be a 0 sized array, so don't write to params
		return true;
	case GL_READ_BUFFER:
		{
			Framebuffer* framebuffer = getReadFramebuffer();
			*params = framebuffer ? framebuffer->getReadBuffer() : GL_NONE;
		}
		return true;
	case GL_SAMPLER_BINDING:
		*params = mState.sampler[mState.activeSampler].name();
		return true;
	case GL_UNIFORM_BUFFER_BINDING:
		*params = mState.genericUniformBuffer.name();
		return true;
	case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
		*params = UNIFORM_BUFFER_OFFSET_ALIGNMENT;
		return true;
	case GL_UNPACK_IMAGE_HEIGHT:
		*params = mState.unpackParameters.imageHeight;
		return true;
	case GL_UNPACK_ROW_LENGTH:
		*params = mState.unpackParameters.rowLength;
		return true;
	case GL_UNPACK_SKIP_IMAGES:
		*params = mState.unpackParameters.skipImages;
		return true;
	case GL_UNPACK_SKIP_PIXELS:
		*params = mState.unpackParameters.skipPixels;
		return true;
	case GL_UNPACK_SKIP_ROWS:
		*params = mState.unpackParameters.skipRows;
		return true;
	case GL_VERTEX_ARRAY_BINDING:
		*params = getCurrentVertexArray()->name;
		return true;
	case GL_TRANSFORM_FEEDBACK_BINDING:
		{
			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
			if(transformFeedback)
			{
				*params = transformFeedback->name;
			}
			else
			{
				return false;
			}
		}
		return true;
	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
		{
			TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
			if(transformFeedback)
			{
				*params = mState.genericTransformFeedbackBuffer.name();
			}
			else
			{
				return false;
			}
		}
		return true;
	default:
		break;
	}

	return false;
}

template bool Context::getTransformFeedbackiv<GLint>(GLuint index, GLenum pname, GLint *param) const;
template bool Context::getTransformFeedbackiv<GLint64>(GLuint index, GLenum pname, GLint64 *param) const;

template<typename T> bool Context::getTransformFeedbackiv(GLuint index, GLenum pname, T *param) const
{
	TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
	if(!transformFeedback)
	{
		return false;
	}

	switch(pname)
	{
	case GL_TRANSFORM_FEEDBACK_BINDING: // GLint, initially 0
		*param = transformFeedback->name;
		break;
	case GL_TRANSFORM_FEEDBACK_ACTIVE: // boolean, initially GL_FALSE
		*param = transformFeedback->isActive();
		break;
	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING: // name, initially 0
		*param = transformFeedback->getBufferName(index);
		break;
	case GL_TRANSFORM_FEEDBACK_PAUSED: // boolean, initially GL_FALSE
		*param = transformFeedback->isPaused();
		break;
	case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
		if(transformFeedback->getBuffer(index))
		{
			*param = transformFeedback->getSize(index);
			break;
		}
		else return false;
	case GL_TRANSFORM_FEEDBACK_BUFFER_START: // indexed[n] 64-bit integer, initially 0
		if(transformFeedback->getBuffer(index))
		{
			*param = transformFeedback->getOffset(index);
			break;
		}
		else return false;
	default:
		return false;
	}

	return true;
}

template bool Context::getUniformBufferiv<GLint>(GLuint index, GLenum pname, GLint *param) const;
template bool Context::getUniformBufferiv<GLint64>(GLuint index, GLenum pname, GLint64 *param) const;

template<typename T> bool Context::getUniformBufferiv(GLuint index, GLenum pname, T *param) const
{
	switch(pname)
	{
	case GL_UNIFORM_BUFFER_BINDING:
	case GL_UNIFORM_BUFFER_SIZE:
	case GL_UNIFORM_BUFFER_START:
		break;
	default:
		return false;
	}

	if(index >= MAX_UNIFORM_BUFFER_BINDINGS)
	{
		return error(GL_INVALID_VALUE, true);
	}

	const BufferBinding& uniformBuffer = mState.uniformBuffers[index];

	switch(pname)
	{
	case GL_UNIFORM_BUFFER_BINDING: // name, initially 0
		*param = uniformBuffer.get().name();
		break;
	case GL_UNIFORM_BUFFER_SIZE: // indexed[n] 64-bit integer, initially 0
		*param = uniformBuffer.getSize();
		break;
	case GL_UNIFORM_BUFFER_START: // indexed[n] 64-bit integer, initially 0
		*param = uniformBuffer.getOffset();
		break;
	default:
		return false;
	}

	return true;
}

bool Context::getQueryParameterInfo(GLenum pname, GLenum *type, unsigned int *numParams) const
{
	// Please note: the query type returned for DEPTH_CLEAR_VALUE in this implementation
	// is FLOAT rather than INT, as would be suggested by the GL ES 2.0 spec. This is due
	// to the fact that it is stored internally as a float, and so would require conversion
	// if returned from Context::getIntegerv. Since this conversion is already implemented
	// in the case that one calls glGetIntegerv to retrieve a float-typed state variable, we
	// place DEPTH_CLEAR_VALUE with the floats. This should make no difference to the calling
	// application.
	switch(pname)
	{
	case GL_COMPRESSED_TEXTURE_FORMATS:
		{
			*type = GL_INT;
			*numParams = NUM_COMPRESSED_TEXTURE_FORMATS;
		}
		break;
	case GL_SHADER_BINARY_FORMATS:
		{
			*type = GL_INT;
			*numParams = 0;
		}
		break;
	case GL_MAX_VERTEX_ATTRIBS:
	case GL_MAX_VERTEX_UNIFORM_VECTORS:
	case GL_MAX_VARYING_VECTORS:
	case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
	case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
	case GL_MAX_TEXTURE_IMAGE_UNITS:
	case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
	case GL_MAX_RENDERBUFFER_SIZE:
	case GL_NUM_SHADER_BINARY_FORMATS:
	case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
	case GL_ARRAY_BUFFER_BINDING:
	case GL_FRAMEBUFFER_BINDING:        // Same as GL_DRAW_FRAMEBUFFER_BINDING_ANGLE
	case GL_READ_FRAMEBUFFER_BINDING:   // Same as GL_READ_FRAMEBUFFER_BINDING_ANGLE
	case GL_RENDERBUFFER_BINDING:
	case GL_CURRENT_PROGRAM:
	case GL_PACK_ALIGNMENT:
	case GL_UNPACK_ALIGNMENT:
	case GL_GENERATE_MIPMAP_HINT:
	case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
	case GL_TEXTURE_FILTERING_HINT_CHROMIUM:
	case GL_RED_BITS:
	case GL_GREEN_BITS:
	case GL_BLUE_BITS:
	case GL_ALPHA_BITS:
	case GL_DEPTH_BITS:
	case GL_STENCIL_BITS:
	case GL_ELEMENT_ARRAY_BUFFER_BINDING:
	case GL_CULL_FACE_MODE:
	case GL_FRONT_FACE:
	case GL_ACTIVE_TEXTURE:
	case GL_STENCIL_FUNC:
	case GL_STENCIL_VALUE_MASK:
	case GL_STENCIL_REF:
	case GL_STENCIL_FAIL:
	case GL_STENCIL_PASS_DEPTH_FAIL:
	case GL_STENCIL_PASS_DEPTH_PASS:
	case GL_STENCIL_BACK_FUNC:
	case GL_STENCIL_BACK_VALUE_MASK:
	case GL_STENCIL_BACK_REF:
	case GL_STENCIL_BACK_FAIL:
	case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
	case GL_STENCIL_BACK_PASS_DEPTH_PASS:
	case GL_DEPTH_FUNC:
	case GL_BLEND_SRC_RGB:
	case GL_BLEND_SRC_ALPHA:
	case GL_BLEND_DST_RGB:
	case GL_BLEND_DST_ALPHA:
	case GL_BLEND_EQUATION_RGB:
	case GL_BLEND_EQUATION_ALPHA:
	case GL_STENCIL_WRITEMASK:
	case GL_STENCIL_BACK_WRITEMASK:
	case GL_STENCIL_CLEAR_VALUE:
	case GL_SUBPIXEL_BITS:
	case GL_MAX_TEXTURE_SIZE:
	case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
	case GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB:
	case GL_SAMPLE_BUFFERS:
	case GL_SAMPLES:
	case GL_IMPLEMENTATION_COLOR_READ_TYPE:
	case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
	case GL_TEXTURE_BINDING_2D:
	case GL_TEXTURE_BINDING_CUBE_MAP:
	case GL_TEXTURE_BINDING_RECTANGLE_ARB:
	case GL_TEXTURE_BINDING_EXTERNAL_OES:
	case GL_TEXTURE_BINDING_3D_OES:
	case GL_COPY_READ_BUFFER_BINDING:
	case GL_COPY_WRITE_BUFFER_BINDING:
	case GL_DRAW_BUFFER0:
	case GL_DRAW_BUFFER1:
	case GL_DRAW_BUFFER2:
	case GL_DRAW_BUFFER3:
	case GL_DRAW_BUFFER4:
	case GL_DRAW_BUFFER5:
	case GL_DRAW_BUFFER6:
	case GL_DRAW_BUFFER7:
	case GL_DRAW_BUFFER8:
	case GL_DRAW_BUFFER9:
	case GL_DRAW_BUFFER10:
	case GL_DRAW_BUFFER11:
	case GL_DRAW_BUFFER12:
	case GL_DRAW_BUFFER13:
	case GL_DRAW_BUFFER14:
	case GL_DRAW_BUFFER15:
	case GL_MAJOR_VERSION:
	case GL_MAX_3D_TEXTURE_SIZE:
	case GL_MAX_ARRAY_TEXTURE_LAYERS:
	case GL_MAX_COLOR_ATTACHMENTS:
	case GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
	case GL_MAX_COMBINED_UNIFORM_BLOCKS:
	case GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:
	case GL_MAX_DRAW_BUFFERS:
	case GL_MAX_ELEMENT_INDEX:
	case GL_MAX_ELEMENTS_INDICES:
	case GL_MAX_ELEMENTS_VERTICES:
	case GL_MAX_FRAGMENT_INPUT_COMPONENTS:
	case GL_MAX_FRAGMENT_UNIFORM_BLOCKS:
	case GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
	case GL_MAX_PROGRAM_TEXEL_OFFSET:
	case GL_MAX_SERVER_WAIT_TIMEOUT:
	case GL_MAX_TEXTURE_LOD_BIAS:
	case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:
	case GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:
	case GL_MAX_UNIFORM_BLOCK_SIZE:
	case GL_MAX_UNIFORM_BUFFER_BINDINGS:
	case GL_MAX_VARYING_COMPONENTS:
	case GL_MAX_VERTEX_OUTPUT_COMPONENTS:
	case GL_MAX_VERTEX_UNIFORM_BLOCKS:
	case GL_MAX_VERTEX_UNIFORM_COMPONENTS:
	case GL_MIN_PROGRAM_TEXEL_OFFSET:
	case GL_MINOR_VERSION:
	case GL_NUM_EXTENSIONS:
	case GL_NUM_PROGRAM_BINARY_FORMATS:
	case GL_PACK_ROW_LENGTH:
	case GL_PACK_SKIP_PIXELS:
	case GL_PACK_SKIP_ROWS:
	case GL_PIXEL_PACK_BUFFER_BINDING:
	case GL_PIXEL_UNPACK_BUFFER_BINDING:
	case GL_PROGRAM_BINARY_FORMATS:
	case GL_READ_BUFFER:
	case GL_SAMPLER_BINDING:
	case GL_TEXTURE_BINDING_2D_ARRAY:
	case GL_UNIFORM_BUFFER_BINDING:
	case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
	case GL_UNPACK_IMAGE_HEIGHT:
	case GL_UNPACK_ROW_LENGTH:
	case GL_UNPACK_SKIP_IMAGES:
	case GL_UNPACK_SKIP_PIXELS:
	case GL_UNPACK_SKIP_ROWS:
	case GL_VERTEX_ARRAY_BINDING:
	case GL_TRANSFORM_FEEDBACK_BINDING:
	case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
		{
			*type = GL_INT;
			*numParams = 1;
		}
		break;
	case GL_MAX_SAMPLES:
		{
			*type = GL_INT;
			*numParams = 1;
		}
		break;
	case GL_MAX_VIEWPORT_DIMS:
		{
			*type = GL_INT;
			*numParams = 2;
		}
		break;
	case GL_VIEWPORT:
	case GL_SCISSOR_BOX:
		{
			*type = GL_INT;
			*numParams = 4;
		}
		break;
	case GL_SHADER_COMPILER:
	case GL_SAMPLE_COVERAGE_INVERT:
	case GL_DEPTH_WRITEMASK:
	case GL_CULL_FACE:                // CULL_FACE through DITHER are natural to IsEnabled,
	case GL_POLYGON_OFFSET_FILL:      // but can be retrieved through the Get{Type}v queries.
	case GL_SAMPLE_ALPHA_TO_COVERAGE: // For this purpose, they are treated here as bool-natural
	case GL_SAMPLE_COVERAGE:
	case GL_SCISSOR_TEST:
	case GL_STENCIL_TEST:
	case GL_DEPTH_TEST:
	case GL_BLEND:
	case GL_DITHER:
	case GL_PRIMITIVE_RESTART_FIXED_INDEX:
	case GL_RASTERIZER_DISCARD:
	case GL_TRANSFORM_FEEDBACK_ACTIVE:
	case GL_TRANSFORM_FEEDBACK_PAUSED:
		{
			*type = GL_BOOL;
			*numParams = 1;
		}
		break;
	case GL_COLOR_WRITEMASK:
		{
			*type = GL_BOOL;
			*numParams = 4;
		}
		break;
	case GL_POLYGON_OFFSET_FACTOR:
	case GL_POLYGON_OFFSET_UNITS:
	case GL_SAMPLE_COVERAGE_VALUE:
	case GL_DEPTH_CLEAR_VALUE:
	case GL_LINE_WIDTH:
		{
			*type = GL_FLOAT;
			*numParams = 1;
		}
		break;
	case GL_ALIASED_LINE_WIDTH_RANGE:
	case GL_ALIASED_POINT_SIZE_RANGE:
	case GL_DEPTH_RANGE:
		{
			*type = GL_FLOAT;
			*numParams = 2;
		}
		break;
	case GL_COLOR_CLEAR_VALUE:
	case GL_BLEND_COLOR:
		{
			*type = GL_FLOAT;
			*numParams = 4;
		}
		break;
	case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT:
		*type = GL_FLOAT;
		*numParams = 1;
		break;
	default:
		return false;
	}

	return true;
}

void Context::applyScissor(int width, int height)
{
	if(mState.scissorTestEnabled)
	{
		sw::Rect scissor = { mState.scissorX, mState.scissorY, mState.scissorX + mState.scissorWidth, mState.scissorY + mState.scissorHeight };
		scissor.clip(0, 0, width, height);

		device->setScissorRect(scissor);
		device->setScissorEnable(true);
	}
	else
	{
		device->setScissorEnable(false);
	}
}

// Applies the render target surface, depth stencil surface, viewport rectangle and scissor rectangle
bool Context::applyRenderTarget()
{
	Framebuffer *framebuffer = getDrawFramebuffer();
	int width, height, samples;

	if(!framebuffer || (framebuffer->completeness(width, height, samples) != GL_FRAMEBUFFER_COMPLETE))
	{
		return error(GL_INVALID_FRAMEBUFFER_OPERATION, false);
	}

	for(int i = 0; i < MAX_DRAW_BUFFERS; i++)
	{
		if(framebuffer->getDrawBuffer(i) != GL_NONE)
		{
			egl::Image *renderTarget = framebuffer->getRenderTarget(i);
			GLint layer = framebuffer->getColorbufferLayer(i);
			device->setRenderTarget(i, renderTarget, layer);
			if(renderTarget) renderTarget->release();
		}
		else
		{
			device->setRenderTarget(i, nullptr, 0);
		}
	}

	egl::Image *depthBuffer = framebuffer->getDepthBuffer();
	GLint dLayer = framebuffer->getDepthbufferLayer();
	device->setDepthBuffer(depthBuffer, dLayer);
	if(depthBuffer) depthBuffer->release();

	egl::Image *stencilBuffer = framebuffer->getStencilBuffer();
	GLint sLayer = framebuffer->getStencilbufferLayer();
	device->setStencilBuffer(stencilBuffer, sLayer);
	if(stencilBuffer) stencilBuffer->release();

	Viewport viewport;
	float zNear = clamp01(mState.zNear);
	float zFar = clamp01(mState.zFar);

	viewport.x0 = mState.viewportX;
	viewport.y0 = mState.viewportY;
	viewport.width = mState.viewportWidth;
	viewport.height = mState.viewportHeight;
	viewport.minZ = zNear;
	viewport.maxZ = zFar;

	if (viewport.x0 > es2::IMPLEMENTATION_MAX_RENDERBUFFER_SIZE ||
		viewport.y0 > es2::IMPLEMENTATION_MAX_RENDERBUFFER_SIZE)
	{
		TransformFeedback* transformFeedback = getTransformFeedback();
		if (!transformFeedback->isActive() || transformFeedback->isPaused())
		{
			return false;
		}
		else
		{
			viewport.x0 = 0;
			viewport.y0 = 0;
			viewport.width = 0;
			viewport.height = 0;
		}
	}

	device->setViewport(viewport);

	applyScissor(width, height);

	Program *program = getCurrentProgram();

	if(program)
	{
		GLfloat nearFarDiff[3] = {zNear, zFar, zFar - zNear};
		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.near"), 1, &nearFarDiff[0]);
		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.far"), 1, &nearFarDiff[1]);
		program->setUniform1fv(program->getUniformLocation("gl_DepthRange.diff"), 1, &nearFarDiff[2]);
	}

	return true;
}

// Applies the fixed-function state (culling, depth test, alpha blending, stenciling, etc)
void Context::applyState(GLenum drawMode)
{
	Framebuffer *framebuffer = getDrawFramebuffer();
	bool frontFaceCCW = (mState.frontFace == GL_CCW);

	if(mState.cullFaceEnabled)
	{
		device->setCullMode(es2sw::ConvertCullMode(mState.cullMode, mState.frontFace), frontFaceCCW);
	}
	else
	{
		device->setCullMode(sw::CULL_NONE, frontFaceCCW);
	}

	if(mDepthStateDirty)
	{
		if(mState.depthTestEnabled)
		{
			device->setDepthBufferEnable(true);
			device->setDepthCompare(es2sw::ConvertDepthComparison(mState.depthFunc));
		}
		else
		{
			device->setDepthBufferEnable(false);
		}

		mDepthStateDirty = false;
	}

	if(mBlendStateDirty)
	{
		if(mState.blendEnabled)
		{
			device->setAlphaBlendEnable(true);
			device->setSeparateAlphaBlendEnable(true);

			device->setBlendConstant(es2sw::ConvertColor(mState.blendColor));

			device->setSourceBlendFactor(es2sw::ConvertBlendFunc(mState.sourceBlendRGB));
			device->setDestBlendFactor(es2sw::ConvertBlendFunc(mState.destBlendRGB));
			device->setBlendOperation(es2sw::ConvertBlendOp(mState.blendEquationRGB));

			device->setSourceBlendFactorAlpha(es2sw::ConvertBlendFunc(mState.sourceBlendAlpha));
			device->setDestBlendFactorAlpha(es2sw::ConvertBlendFunc(mState.destBlendAlpha));
			device->setBlendOperationAlpha(es2sw::ConvertBlendOp(mState.blendEquationAlpha));
		}
		else
		{
			device->setAlphaBlendEnable(false);
		}

		mBlendStateDirty = false;
	}

	if(mStencilStateDirty || mFrontFaceDirty)
	{
		if(mState.stencilTestEnabled && framebuffer->hasStencil())
		{
			device->setStencilEnable(true);
			device->setTwoSidedStencil(true);

			// get the maximum size of the stencil ref
			Renderbuffer *stencilbuffer = framebuffer->getStencilbuffer();
			GLuint maxStencil = (1 << stencilbuffer->getStencilSize()) - 1;

			if(mState.frontFace == GL_CCW)
			{
				device->setStencilWriteMask(mState.stencilWritemask);
				device->setStencilCompare(es2sw::ConvertStencilComparison(mState.stencilFunc));

				device->setStencilReference((mState.stencilRef < (GLint)maxStencil) ? mState.stencilRef : maxStencil);
				device->setStencilMask(mState.stencilMask);

				device->setStencilFailOperation(es2sw::ConvertStencilOp(mState.stencilFail));
				device->setStencilZFailOperation(es2sw::ConvertStencilOp(mState.stencilPassDepthFail));
				device->setStencilPassOperation(es2sw::ConvertStencilOp(mState.stencilPassDepthPass));

				device->setStencilWriteMaskCCW(mState.stencilBackWritemask);
				device->setStencilCompareCCW(es2sw::ConvertStencilComparison(mState.stencilBackFunc));

				device->setStencilReferenceCCW((mState.stencilBackRef < (GLint)maxStencil) ? mState.stencilBackRef : maxStencil);
				device->setStencilMaskCCW(mState.stencilBackMask);

				device->setStencilFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackFail));
				device->setStencilZFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackPassDepthFail));
				device->setStencilPassOperationCCW(es2sw::ConvertStencilOp(mState.stencilBackPassDepthPass));
			}
			else
			{
				device->setStencilWriteMaskCCW(mState.stencilWritemask);
				device->setStencilCompareCCW(es2sw::ConvertStencilComparison(mState.stencilFunc));

				device->setStencilReferenceCCW((mState.stencilRef < (GLint)maxStencil) ? mState.stencilRef : maxStencil);
				device->setStencilMaskCCW(mState.stencilMask);

				device->setStencilFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilFail));
				device->setStencilZFailOperationCCW(es2sw::ConvertStencilOp(mState.stencilPassDepthFail));
				device->setStencilPassOperationCCW(es2sw::ConvertStencilOp(mState.stencilPassDepthPass));

				device->setStencilWriteMask(mState.stencilBackWritemask);
				device->setStencilCompare(es2sw::ConvertStencilComparison(mState.stencilBackFunc));

				device->setStencilReference((mState.stencilBackRef < (GLint)maxStencil) ? mState.stencilBackRef : maxStencil);
				device->setStencilMask(mState.stencilBackMask);

				device->setStencilFailOperation(es2sw::ConvertStencilOp(mState.stencilBackFail));
				device->setStencilZFailOperation(es2sw::ConvertStencilOp(mState.stencilBackPassDepthFail));
				device->setStencilPassOperation(es2sw::ConvertStencilOp(mState.stencilBackPassDepthPass));
			}
		}
		else
		{
			device->setStencilEnable(false);
		}

		mStencilStateDirty = false;
		mFrontFaceDirty = false;
	}

	if(mMaskStateDirty)
	{
		for(int i = 0; i < MAX_DRAW_BUFFERS; i++)
		{
			device->setColorWriteMask(i, es2sw::ConvertColorMask(mState.colorMaskRed, mState.colorMaskGreen, mState.colorMaskBlue, mState.colorMaskAlpha));
		}

		device->setDepthWriteEnable(mState.depthMask);

		mMaskStateDirty = false;
	}

	if(mPolygonOffsetStateDirty)
	{
		if(mState.polygonOffsetFillEnabled)
		{
			Renderbuffer *depthbuffer = framebuffer->getDepthbuffer();
			if(depthbuffer)
			{
				device->setSlopeDepthBias(mState.polygonOffsetFactor);
				float depthBias = ldexp(mState.polygonOffsetUnits, -23);   // We use 32-bit floating-point for all depth formats, with 23 mantissa bits.
				device->setDepthBias(depthBias);
			}
		}
		else
		{
			device->setSlopeDepthBias(0);
			device->setDepthBias(0);
		}

		mPolygonOffsetStateDirty = false;
	}

	if(mSampleStateDirty)
	{
		if(mState.sampleAlphaToCoverageEnabled)
		{
			device->setTransparencyAntialiasing(sw::TRANSPARENCY_ALPHA_TO_COVERAGE);
		}
		else
		{
			device->setTransparencyAntialiasing(sw::TRANSPARENCY_NONE);
		}

		if(mState.sampleCoverageEnabled)
		{
			unsigned int mask = 0;
			if(mState.sampleCoverageValue != 0)
			{
				int width, height, samples;
				framebuffer->completeness(width, height, samples);

				float threshold = 0.5f;

				for(int i = 0; i < samples; i++)
				{
					mask <<= 1;

					if((i + 1) * mState.sampleCoverageValue >= threshold)
					{
						threshold += 1.0f;
						mask |= 1;
					}
				}
			}

			if(mState.sampleCoverageInvert)
			{
				mask = ~mask;
			}

			device->setMultiSampleMask(mask);
		}
		else
		{
			device->setMultiSampleMask(0xFFFFFFFF);
		}

		mSampleStateDirty = false;