src/Device/Sampler.cpp - SwiftShader - Git at Google

 // 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.

 #include "Sampler.hpp"

 #include "Context.hpp"
 #include "Pipeline/PixelRoutine.hpp"
 #include "Vulkan/VkDebug.hpp"
 #include "Vulkan/VkImage.hpp"

 #include <cstring>

 namespace sw
 {
 	FilterType Sampler::maximumTextureFilterQuality = FILTER_LINEAR;
 	MipmapType Sampler::maximumMipmapFilterQuality = MIPMAP_POINT;

 	Sampler::State::State()
 	{
 		memset(this, 0, sizeof(State));
 	}

 	Sampler::Sampler()
 	{
 		// FIXME: Mipmap::init
 		static const unsigned int zero = 0x00FF00FF;

 		for(int level = 0; level < MIPMAP_LEVELS; level++)
 		{
 			Mipmap &mipmap = texture.mipmap[level];

 			memset(&mipmap, 0, sizeof(Mipmap));

 			for(int face = 0; face < 6; face++)
 			{
 				mipmap.buffer[face] = &zero;
 			}
 		}

 		textureFormat = VK_FORMAT_UNDEFINED;
 		textureType = TEXTURE_NULL;

 		textureFilter = FILTER_LINEAR;
 		addressingModeU = ADDRESSING_WRAP;
 		addressingModeV = ADDRESSING_WRAP;
 		addressingModeW = ADDRESSING_WRAP;
 		mipmapFilterState = MIPMAP_NONE;
 		sRGB = false;
 		gather = false;
 		highPrecisionFiltering = false;
 		border = 0;

 		swizzle = { VK_COMPONENT_SWIZZLE_R, VK_COMPONENT_SWIZZLE_G, VK_COMPONENT_SWIZZLE_B, VK_COMPONENT_SWIZZLE_A };

 		compare = COMPARE_BYPASS;

 		exp2LOD = 1.0f;

 		texture.maxLod = MAX_TEXTURE_LOD;
 		texture.minLod = 0;
 	}

 	Sampler::~Sampler()
 	{
 	}

 	Sampler::State Sampler::samplerState() const
 	{
 		State state;

 		if(textureType != TEXTURE_NULL)
 		{
 			state.textureType = textureType;
 			state.textureFormat = textureFormat;
 			state.textureFilter = getTextureFilter();
 			state.addressingModeU = getAddressingModeU();
 			state.addressingModeV = getAddressingModeV();
 			state.addressingModeW = getAddressingModeW();
 			state.mipmapFilter = mipmapFilter();
 			state.sRGB = (sRGB && textureFormat.isSRGBreadable()) || textureFormat.isSRGBformat();
 			state.swizzle = swizzle;
 			state.highPrecisionFiltering = highPrecisionFiltering;
 			state.compare = getCompareFunc();

 			#if PERF_PROFILE
 				state.compressedFormat = Surface::isCompressed(externalTextureFormat);
 			#endif
 		}

 		return state;
 	}

 	void Sampler::setTextureLevel(int face, int level, vk::Image *image, TextureType type)
 	{
 		if(image)
 		{
 			Mipmap &mipmap = texture.mipmap[level];

 			border = image->isCube() ? 1 : 0;
 			VkImageSubresourceLayers subresourceLayers =
 			{
 				VK_IMAGE_ASPECT_COLOR_BIT,
 				static_cast<uint32_t>(level),
 				static_cast<uint32_t>(face),
 				1
 			};
 			mipmap.buffer[face] = image->getTexelPointer({ -border, -border, 0 }, subresourceLayers);

 			if(face == 0)
 			{
 				VkImageAspectFlagBits aspect = VK_IMAGE_ASPECT_COLOR_BIT; // FIXME: get proper aspect
 				textureFormat = image->getFormat(aspect);

 				VkExtent3D mipLevelExtent = image->getMipLevelExtent(level);
 				int width = mipLevelExtent.width;
 				int height = mipLevelExtent.height;
 				int depth = mipLevelExtent.depth;
 				int pitchP = image->rowPitchBytes(aspect, level);
 				int sliceP = image->slicePitchBytes(aspect, level);

 				if(level == 0)
 				{
 					texture.widthHeightLOD[0] = width * exp2LOD;
 					texture.widthHeightLOD[1] = width * exp2LOD;
 					texture.widthHeightLOD[2] = height * exp2LOD;
 					texture.widthHeightLOD[3] = height * exp2LOD;

 					texture.widthLOD[0] = width * exp2LOD;
 					texture.widthLOD[1] = width * exp2LOD;
 					texture.widthLOD[2] = width * exp2LOD;
 					texture.widthLOD[3] = width * exp2LOD;

 					texture.heightLOD[0] = height * exp2LOD;
 					texture.heightLOD[1] = height * exp2LOD;
 					texture.heightLOD[2] = height * exp2LOD;
 					texture.heightLOD[3] = height * exp2LOD;

 					texture.depthLOD[0] = depth * exp2LOD;
 					texture.depthLOD[1] = depth * exp2LOD;
 					texture.depthLOD[2] = depth * exp2LOD;
 					texture.depthLOD[3] = depth * exp2LOD;
 				}

 				if(textureFormat.isFloatFormat())
 				{
 					mipmap.fWidth[0] = (float)width / 65536.0f;
 					mipmap.fWidth[1] = (float)width / 65536.0f;
 					mipmap.fWidth[2] = (float)width / 65536.0f;
 					mipmap.fWidth[3] = (float)width / 65536.0f;

 					mipmap.fHeight[0] = (float)height / 65536.0f;
 					mipmap.fHeight[1] = (float)height / 65536.0f;
 					mipmap.fHeight[2] = (float)height / 65536.0f;
 					mipmap.fHeight[3] = (float)height / 65536.0f;

 					mipmap.fDepth[0] = (float)depth / 65536.0f;
 					mipmap.fDepth[1] = (float)depth / 65536.0f;
 					mipmap.fDepth[2] = (float)depth / 65536.0f;
 					mipmap.fDepth[3] = (float)depth / 65536.0f;
 				}

 				short halfTexelU = 0x8000 / width;
 				short halfTexelV = 0x8000 / height;
 				short halfTexelW = 0x8000 / depth;

 				mipmap.uHalf[0] = halfTexelU;
 				mipmap.uHalf[1] = halfTexelU;
 				mipmap.uHalf[2] = halfTexelU;
 				mipmap.uHalf[3] = halfTexelU;

 				mipmap.vHalf[0] = halfTexelV;
 				mipmap.vHalf[1] = halfTexelV;
 				mipmap.vHalf[2] = halfTexelV;
 				mipmap.vHalf[3] = halfTexelV;

 				mipmap.wHalf[0] = halfTexelW;
 				mipmap.wHalf[1] = halfTexelW;
 				mipmap.wHalf[2] = halfTexelW;
 				mipmap.wHalf[3] = halfTexelW;

 				mipmap.width[0] = width;
 				mipmap.width[1] = width;
 				mipmap.width[2] = width;
 				mipmap.width[3] = width;

 				mipmap.height[0] = height;
 				mipmap.height[1] = height;
 				mipmap.height[2] = height;
 				mipmap.height[3] = height;

 				mipmap.depth[0] = depth;
 				mipmap.depth[1] = depth;
 				mipmap.depth[2] = depth;
 				mipmap.depth[3] = depth;

 				mipmap.onePitchP[0] = 1;
 				mipmap.onePitchP[1] = pitchP;
 				mipmap.onePitchP[2] = 1;
 				mipmap.onePitchP[3] = pitchP;

 				mipmap.pitchP[0] = pitchP;
 				mipmap.pitchP[1] = pitchP;
 				mipmap.pitchP[2] = pitchP;
 				mipmap.pitchP[3] = pitchP;

 				mipmap.sliceP[0] = sliceP;
 				mipmap.sliceP[1] = sliceP;
 				mipmap.sliceP[2] = sliceP;
 				mipmap.sliceP[3] = sliceP;

 				if(textureFormat.hasYuvFormat())
 				{
 					unsigned int YStride = pitchP;
 					unsigned int YSize = YStride * height;
 					unsigned int CStride = align<16>(YStride / 2);
 					unsigned int CSize = CStride * height / 2;

 					mipmap.buffer[1] = (byte*)mipmap.buffer[0] + YSize;
 					mipmap.buffer[2] = (byte*)mipmap.buffer[1] + CSize;

 					texture.mipmap[1].width[0] = width / 2;
 					texture.mipmap[1].width[1] = width / 2;
 					texture.mipmap[1].width[2] = width / 2;
 					texture.mipmap[1].width[3] = width / 2;
 					texture.mipmap[1].height[0] = height / 2;
 					texture.mipmap[1].height[1] = height / 2;
 					texture.mipmap[1].height[2] = height / 2;
 					texture.mipmap[1].height[3] = height / 2;
 					texture.mipmap[1].onePitchP[0] = 1;
 					texture.mipmap[1].onePitchP[1] = CStride;
 					texture.mipmap[1].onePitchP[2] = 1;
 					texture.mipmap[1].onePitchP[3] = CStride;
 				}
 			}
 		}

 		textureType = type;
 	}

 	void Sampler::setTextureFilter(FilterType textureFilter)
 	{
 		this->textureFilter = (FilterType)min(textureFilter, maximumTextureFilterQuality);
 	}

 	void Sampler::setMipmapFilter(MipmapType mipmapFilter)
 	{
 		mipmapFilterState = (MipmapType)min(mipmapFilter, maximumMipmapFilterQuality);
 	}

 	void Sampler::setGatherEnable(bool enable)
 	{
 		gather = enable;
 	}

 	void Sampler::setAddressingModeU(AddressingMode addressingMode)
 	{
 		addressingModeU = addressingMode;
 	}

 	void Sampler::setAddressingModeV(AddressingMode addressingMode)
 	{
 		addressingModeV = addressingMode;
 	}

 	void Sampler::setAddressingModeW(AddressingMode addressingMode)
 	{
 		addressingModeW = addressingMode;
 	}

 	void Sampler::setReadSRGB(bool sRGB)
 	{
 		this->sRGB = sRGB;
 	}

 	void Sampler::setMaxAnisotropy(float maxAnisotropy)
 	{
 		texture.maxAnisotropy = maxAnisotropy;
 	}

 	void Sampler::setHighPrecisionFiltering(bool highPrecisionFiltering)
 	{
 		this->highPrecisionFiltering = highPrecisionFiltering;
 	}

 	void Sampler::setCompareFunc(CompareFunc compare)
 	{
 		this->compare = compare;
 	}

 	void Sampler::setMinLod(float minLod)
 	{
 		texture.minLod = clamp(minLod, 0.0f, (float)(MAX_TEXTURE_LOD));
 	}

 	void Sampler::setMaxLod(float maxLod)
 	{
 		texture.maxLod = clamp(maxLod, 0.0f, (float)(MAX_TEXTURE_LOD));
 	}

 	void Sampler::setFilterQuality(FilterType maximumFilterQuality)
 	{
 		Sampler::maximumTextureFilterQuality = maximumFilterQuality;
 	}

 	void Sampler::setMipmapQuality(MipmapType maximumFilterQuality)
 	{
 		Sampler::maximumMipmapFilterQuality = maximumFilterQuality;
 	}

 	void Sampler::setMipmapLOD(float LOD)
 	{
 		exp2LOD = exp2(LOD);
 	}

 	bool Sampler::hasTexture() const
 	{
 		return textureType != TEXTURE_NULL;
 	}

 	bool Sampler::hasUnsignedTexture() const
 	{
 		return textureFormat.isUnsignedComponent(0) &&
 		       textureFormat.isUnsignedComponent(1) &&
 		       textureFormat.isUnsignedComponent(2) &&
 		       textureFormat.isUnsignedComponent(3);
 	}

 	bool Sampler::hasCubeTexture() const
 	{
 		return textureType == TEXTURE_CUBE;
 	}

 	bool Sampler::hasVolumeTexture() const
 	{
 		return textureType == TEXTURE_3D || textureType == TEXTURE_2D_ARRAY;
 	}

 	const Texture &Sampler::getTextureData()
 	{
 		return texture;
 	}

 	MipmapType Sampler::mipmapFilter() const
 	{
 		if(mipmapFilterState != MIPMAP_NONE)
 		{
 			for(int i = 1; i < MIPMAP_LEVELS; i++)
 			{
 				if(texture.mipmap[0].buffer[0] != texture.mipmap[i].buffer[0])
 				{
 					return mipmapFilterState;
 				}
 			}
 		}

 		// Only one mipmap level
 		return MIPMAP_NONE;
 	}

 	TextureType Sampler::getTextureType() const
 	{
 		return textureType;
 	}

 	FilterType Sampler::getTextureFilter() const
 	{
 		// Don't filter 1x1 textures.
 		if(texture.mipmap[0].width[0] == 1 && texture.mipmap[0].height[0] == 1 && texture.mipmap[0].depth[0] == 1)
 		{
 			if(mipmapFilter() == MIPMAP_NONE)
 			{
 				return FILTER_POINT;
 			}
 		}

 		FilterType filter = textureFilter;

 		if(gather && textureFormat.componentCount() == 1)
 		{
 			filter = FILTER_GATHER;
 		}

 		if(textureType != TEXTURE_2D || texture.maxAnisotropy == 1.0f)
 		{
 			return (FilterType)min(filter, FILTER_LINEAR);
 		}

 		return filter;
 	}

 	AddressingMode Sampler::getAddressingModeU() const
 	{
 		if(textureType == TEXTURE_CUBE)
 		{
 			return border ? ADDRESSING_SEAMLESS : ADDRESSING_CLAMP;
 		}

 		return addressingModeU;
 	}

 	AddressingMode Sampler::getAddressingModeV() const
 	{
 		if(textureType == TEXTURE_CUBE)
 		{
 			return border ? ADDRESSING_SEAMLESS : ADDRESSING_CLAMP;
 		}

 		return addressingModeV;
 	}

 	AddressingMode Sampler::getAddressingModeW() const
 	{
 		if(textureType == TEXTURE_2D_ARRAY ||
 		   textureType == TEXTURE_2D ||
 		   textureType == TEXTURE_CUBE ||
 		   textureType == TEXTURE_RECTANGLE)
 		{
 			return ADDRESSING_LAYER;
 		}

 		return addressingModeW;
 	}

 	CompareFunc Sampler::getCompareFunc() const
 	{
 		if(getTextureFilter() == FILTER_GATHER)
 		{
 			return COMPARE_BYPASS;
 		}

 		return compare;
 	}
 }
	// 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.

	#include "Sampler.hpp"

	#include "Context.hpp"
	#include "Pipeline/PixelRoutine.hpp"
	#include "Vulkan/VkDebug.hpp"
	#include "Vulkan/VkImage.hpp"

	#include <cstring>

	namespace sw
	{
	FilterType Sampler::maximumTextureFilterQuality = FILTER_LINEAR;
	MipmapType Sampler::maximumMipmapFilterQuality = MIPMAP_POINT;

	Sampler::State::State()
	{
	memset(this, 0, sizeof(State));
	}

	Sampler::Sampler()
	{
	// FIXME: Mipmap::init
	static const unsigned int zero = 0x00FF00FF;

	for(int level = 0; level < MIPMAP_LEVELS; level++)
	{
	Mipmap &mipmap = texture.mipmap[level];

	memset(&mipmap, 0, sizeof(Mipmap));

	for(int face = 0; face < 6; face++)
	{
	mipmap.buffer[face] = &zero;
	}
	}

	textureFormat = VK_FORMAT_UNDEFINED;
	textureType = TEXTURE_NULL;

	textureFilter = FILTER_LINEAR;
	addressingModeU = ADDRESSING_WRAP;
	addressingModeV = ADDRESSING_WRAP;
	addressingModeW = ADDRESSING_WRAP;
	mipmapFilterState = MIPMAP_NONE;
	sRGB = false;
	gather = false;
	highPrecisionFiltering = false;
	border = 0;

	swizzle = { VK_COMPONENT_SWIZZLE_R, VK_COMPONENT_SWIZZLE_G, VK_COMPONENT_SWIZZLE_B, VK_COMPONENT_SWIZZLE_A };

	compare = COMPARE_BYPASS;

	exp2LOD = 1.0f;

	texture.maxLod = MAX_TEXTURE_LOD;
	texture.minLod = 0;
	}

	Sampler::~Sampler()
	{
	}

	Sampler::State Sampler::samplerState() const
	{
	State state;

	if(textureType != TEXTURE_NULL)
	{
	state.textureType = textureType;
	state.textureFormat = textureFormat;
	state.textureFilter = getTextureFilter();
	state.addressingModeU = getAddressingModeU();
	state.addressingModeV = getAddressingModeV();
	state.addressingModeW = getAddressingModeW();
	state.mipmapFilter = mipmapFilter();
	state.sRGB = (sRGB && textureFormat.isSRGBreadable()) \|\| textureFormat.isSRGBformat();
	state.swizzle = swizzle;
	state.highPrecisionFiltering = highPrecisionFiltering;
	state.compare = getCompareFunc();

	#if PERF_PROFILE
	state.compressedFormat = Surface::isCompressed(externalTextureFormat);
	#endif
	}

	return state;
	}

	void Sampler::setTextureLevel(int face, int level, vk::Image *image, TextureType type)
	{
	if(image)
	{
	Mipmap &mipmap = texture.mipmap[level];

	border = image->isCube() ? 1 : 0;
	VkImageSubresourceLayers subresourceLayers =
	{
	VK_IMAGE_ASPECT_COLOR_BIT,
	static_cast<uint32_t>(level),
	static_cast<uint32_t>(face),
	1
	};
	mipmap.buffer[face] = image->getTexelPointer({ -border, -border, 0 }, subresourceLayers);

	if(face == 0)
	{
	VkImageAspectFlagBits aspect = VK_IMAGE_ASPECT_COLOR_BIT; // FIXME: get proper aspect
	textureFormat = image->getFormat(aspect);

	VkExtent3D mipLevelExtent = image->getMipLevelExtent(level);
	int width = mipLevelExtent.width;
	int height = mipLevelExtent.height;
	int depth = mipLevelExtent.depth;
	int pitchP = image->rowPitchBytes(aspect, level);
	int sliceP = image->slicePitchBytes(aspect, level);

	if(level == 0)
	{
	texture.widthHeightLOD[0] = width * exp2LOD;
	texture.widthHeightLOD[1] = width * exp2LOD;
	texture.widthHeightLOD[2] = height * exp2LOD;
	texture.widthHeightLOD[3] = height * exp2LOD;

	texture.widthLOD[0] = width * exp2LOD;
	texture.widthLOD[1] = width * exp2LOD;
	texture.widthLOD[2] = width * exp2LOD;
	texture.widthLOD[3] = width * exp2LOD;

	texture.heightLOD[0] = height * exp2LOD;
	texture.heightLOD[1] = height * exp2LOD;
	texture.heightLOD[2] = height * exp2LOD;
	texture.heightLOD[3] = height * exp2LOD;

	texture.depthLOD[0] = depth * exp2LOD;
	texture.depthLOD[1] = depth * exp2LOD;
	texture.depthLOD[2] = depth * exp2LOD;
	texture.depthLOD[3] = depth * exp2LOD;
	}

	if(textureFormat.isFloatFormat())
	{
	mipmap.fWidth[0] = (float)width / 65536.0f;
	mipmap.fWidth[1] = (float)width / 65536.0f;
	mipmap.fWidth[2] = (float)width / 65536.0f;
	mipmap.fWidth[3] = (float)width / 65536.0f;

	mipmap.fHeight[0] = (float)height / 65536.0f;
	mipmap.fHeight[1] = (float)height / 65536.0f;
	mipmap.fHeight[2] = (float)height / 65536.0f;
	mipmap.fHeight[3] = (float)height / 65536.0f;

	mipmap.fDepth[0] = (float)depth / 65536.0f;
	mipmap.fDepth[1] = (float)depth / 65536.0f;
	mipmap.fDepth[2] = (float)depth / 65536.0f;
	mipmap.fDepth[3] = (float)depth / 65536.0f;
	}

	short halfTexelU = 0x8000 / width;
	short halfTexelV = 0x8000 / height;
	short halfTexelW = 0x8000 / depth;

	mipmap.uHalf[0] = halfTexelU;
	mipmap.uHalf[1] = halfTexelU;
	mipmap.uHalf[2] = halfTexelU;
	mipmap.uHalf[3] = halfTexelU;

	mipmap.vHalf[0] = halfTexelV;
	mipmap.vHalf[1] = halfTexelV;
	mipmap.vHalf[2] = halfTexelV;
	mipmap.vHalf[3] = halfTexelV;

	mipmap.wHalf[0] = halfTexelW;
	mipmap.wHalf[1] = halfTexelW;
	mipmap.wHalf[2] = halfTexelW;
	mipmap.wHalf[3] = halfTexelW;

	mipmap.width[0] = width;
	mipmap.width[1] = width;
	mipmap.width[2] = width;
	mipmap.width[3] = width;

	mipmap.height[0] = height;
	mipmap.height[1] = height;
	mipmap.height[2] = height;
	mipmap.height[3] = height;

	mipmap.depth[0] = depth;
	mipmap.depth[1] = depth;
	mipmap.depth[2] = depth;
	mipmap.depth[3] = depth;

	mipmap.onePitchP[0] = 1;
	mipmap.onePitchP[1] = pitchP;
	mipmap.onePitchP[2] = 1;
	mipmap.onePitchP[3] = pitchP;

	mipmap.pitchP[0] = pitchP;
	mipmap.pitchP[1] = pitchP;
	mipmap.pitchP[2] = pitchP;
	mipmap.pitchP[3] = pitchP;

	mipmap.sliceP[0] = sliceP;
	mipmap.sliceP[1] = sliceP;
	mipmap.sliceP[2] = sliceP;
	mipmap.sliceP[3] = sliceP;

	if(textureFormat.hasYuvFormat())
	{
	unsigned int YStride = pitchP;
	unsigned int YSize = YStride * height;
	unsigned int CStride = align<16>(YStride / 2);
	unsigned int CSize = CStride * height / 2;

	mipmap.buffer[1] = (byte*)mipmap.buffer[0] + YSize;
	mipmap.buffer[2] = (byte*)mipmap.buffer[1] + CSize;

	texture.mipmap[1].width[0] = width / 2;
	texture.mipmap[1].width[1] = width / 2;
	texture.mipmap[1].width[2] = width / 2;
	texture.mipmap[1].width[3] = width / 2;
	texture.mipmap[1].height[0] = height / 2;
	texture.mipmap[1].height[1] = height / 2;
	texture.mipmap[1].height[2] = height / 2;
	texture.mipmap[1].height[3] = height / 2;
	texture.mipmap[1].onePitchP[0] = 1;
	texture.mipmap[1].onePitchP[1] = CStride;
	texture.mipmap[1].onePitchP[2] = 1;
	texture.mipmap[1].onePitchP[3] = CStride;
	}
	}
	}

	textureType = type;
	}

	void Sampler::setTextureFilter(FilterType textureFilter)
	{
	this->textureFilter = (FilterType)min(textureFilter, maximumTextureFilterQuality);
	}

	void Sampler::setMipmapFilter(MipmapType mipmapFilter)
	{
	mipmapFilterState = (MipmapType)min(mipmapFilter, maximumMipmapFilterQuality);
	}

	void Sampler::setGatherEnable(bool enable)
	{
	gather = enable;
	}

	void Sampler::setAddressingModeU(AddressingMode addressingMode)
	{
	addressingModeU = addressingMode;
	}

	void Sampler::setAddressingModeV(AddressingMode addressingMode)
	{
	addressingModeV = addressingMode;
	}

	void Sampler::setAddressingModeW(AddressingMode addressingMode)
	{
	addressingModeW = addressingMode;
	}

	void Sampler::setReadSRGB(bool sRGB)
	{
	this->sRGB = sRGB;
	}

	void Sampler::setMaxAnisotropy(float maxAnisotropy)
	{
	texture.maxAnisotropy = maxAnisotropy;
	}

	void Sampler::setHighPrecisionFiltering(bool highPrecisionFiltering)
	{
	this->highPrecisionFiltering = highPrecisionFiltering;
	}

	void Sampler::setCompareFunc(CompareFunc compare)
	{
	this->compare = compare;
	}

	void Sampler::setMinLod(float minLod)
	{
	texture.minLod = clamp(minLod, 0.0f, (float)(MAX_TEXTURE_LOD));
	}

	void Sampler::setMaxLod(float maxLod)
	{
	texture.maxLod = clamp(maxLod, 0.0f, (float)(MAX_TEXTURE_LOD));
	}

	void Sampler::setFilterQuality(FilterType maximumFilterQuality)
	{
	Sampler::maximumTextureFilterQuality = maximumFilterQuality;
	}

	void Sampler::setMipmapQuality(MipmapType maximumFilterQuality)
	{
	Sampler::maximumMipmapFilterQuality = maximumFilterQuality;
	}

	void Sampler::setMipmapLOD(float LOD)
	{
	exp2LOD = exp2(LOD);
	}

	bool Sampler::hasTexture() const
	{
	return textureType != TEXTURE_NULL;
	}

	bool Sampler::hasUnsignedTexture() const
	{
	return textureFormat.isUnsignedComponent(0) &&
	textureFormat.isUnsignedComponent(1) &&
	textureFormat.isUnsignedComponent(2) &&
	textureFormat.isUnsignedComponent(3);
	}

	bool Sampler::hasCubeTexture() const
	{
	return textureType == TEXTURE_CUBE;
	}

	bool Sampler::hasVolumeTexture() const
	{
	return textureType == TEXTURE_3D \|\| textureType == TEXTURE_2D_ARRAY;
	}

	const Texture &Sampler::getTextureData()
	{
	return texture;
	}

	MipmapType Sampler::mipmapFilter() const
	{
	if(mipmapFilterState != MIPMAP_NONE)
	{
	for(int i = 1; i < MIPMAP_LEVELS; i++)
	{
	if(texture.mipmap[0].buffer[0] != texture.mipmap[i].buffer[0])
	{
	return mipmapFilterState;
	}
	}
	}

	// Only one mipmap level
	return MIPMAP_NONE;
	}

	TextureType Sampler::getTextureType() const
	{
	return textureType;
	}

	FilterType Sampler::getTextureFilter() const
	{
	// Don't filter 1x1 textures.
	if(texture.mipmap[0].width[0] == 1 && texture.mipmap[0].height[0] == 1 && texture.mipmap[0].depth[0] == 1)
	{
	if(mipmapFilter() == MIPMAP_NONE)
	{
	return FILTER_POINT;
	}
	}

	FilterType filter = textureFilter;

	if(gather && textureFormat.componentCount() == 1)
	{
	filter = FILTER_GATHER;
	}

	if(textureType != TEXTURE_2D \|\| texture.maxAnisotropy == 1.0f)
	{
	return (FilterType)min(filter, FILTER_LINEAR);
	}

	return filter;
	}

	AddressingMode Sampler::getAddressingModeU() const
	{
	if(textureType == TEXTURE_CUBE)
	{
	return border ? ADDRESSING_SEAMLESS : ADDRESSING_CLAMP;
	}

	return addressingModeU;
	}

	AddressingMode Sampler::getAddressingModeV() const
	{
	if(textureType == TEXTURE_CUBE)
	{
	return border ? ADDRESSING_SEAMLESS : ADDRESSING_CLAMP;
	}

	return addressingModeV;
	}

	AddressingMode Sampler::getAddressingModeW() const
	{
	if(textureType == TEXTURE_2D_ARRAY \|\|
	textureType == TEXTURE_2D \|\|
	textureType == TEXTURE_CUBE \|\|
	textureType == TEXTURE_RECTANGLE)
	{
	return ADDRESSING_LAYER;
	}

	return addressingModeW;
	}

	CompareFunc Sampler::getCompareFunc() const
	{
	if(getTextureFilter() == FILTER_GATHER)
	{
	return COMPARE_BYPASS;
	}

	return compare;
	}
	}