// SwiftShader Software Renderer
//
// Copyright(c) 2005-2013 TransGaming Inc.
//
// All rights reserved. No part of this software may be copied, distributed, transmitted,
// transcribed, stored in a retrieval system, translated into any human or computer
// language by any means, or disclosed to third parties without the explicit written
// agreement of TransGaming Inc. Without such an agreement, no rights or licenses, express
// or implied, including but not limited to any patent rights, are granted to you.
//

// main.cpp: DLL entry point and management of thread-local data.

#include "main.h"

#include "libGLESv2.hpp"
#include "Framebuffer.h"
#include "libEGL/main.h"
#include "libEGL/Surface.h"
#include "Common/Thread.hpp"
#include "Common/SharedLibrary.hpp"
#include "common/debug.h"

#if !defined(_MSC_VER)
#define CONSTRUCTOR __attribute__((constructor))
#define DESTRUCTOR __attribute__((destructor))
#else
#define CONSTRUCTOR
#define DESTRUCTOR
#endif

static void glAttachThread()
{
    TRACE("()");
}

static void glDetachThread()
{
    TRACE("()");
}

CONSTRUCTOR static void glAttachProcess()
{
    TRACE("()");

    glAttachThread();
}

DESTRUCTOR static void glDetachProcess()
{
    TRACE("()");

	glDetachThread();
}

#if defined(_WIN32)
extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
{
    switch(reason)
    {
    case DLL_PROCESS_ATTACH:
        glAttachProcess();
        break;
    case DLL_THREAD_ATTACH:
        glAttachThread();
        break;
    case DLL_THREAD_DETACH:
        glDetachThread();
        break;
    case DLL_PROCESS_DETACH:
        glDetachProcess();
        break;
    default:
        break;
    }

    return TRUE;
}
#endif

namespace es2
{
es2::Context *getContext()
{
	egl::Context *context = libEGL->clientGetCurrentContext();

	if(context && (context->getClientVersion() == 2 ||
	               context->getClientVersion() == 3))
	{
		return static_cast<es2::Context*>(context);
	}

	return 0;
}

egl::Display *getDisplay()
{
    return libEGL->clientGetCurrentDisplay();
}

Device *getDevice()
{
    Context *context = getContext();

    return context ? context->getDevice() : 0;
}

// Records an error code
void error(GLenum errorCode)
{
    es2::Context *context = es2::getContext();

    if(context)
    {
        switch(errorCode)
        {
        case GL_INVALID_ENUM:
            context->recordInvalidEnum();
            TRACE("\t! Error generated: invalid enum\n");
            break;
        case GL_INVALID_VALUE:
            context->recordInvalidValue();
            TRACE("\t! Error generated: invalid value\n");
            break;
        case GL_INVALID_OPERATION:
            context->recordInvalidOperation();
            TRACE("\t! Error generated: invalid operation\n");
            break;
        case GL_OUT_OF_MEMORY:
            context->recordOutOfMemory();
            TRACE("\t! Error generated: out of memory\n");
            break;
        case GL_INVALID_FRAMEBUFFER_OPERATION:
            context->recordInvalidFramebufferOperation();
            TRACE("\t! Error generated: invalid framebuffer operation\n");
            break;
        default: UNREACHABLE();
        }
    }
}
}

namespace egl
{
GLint getClientVersion()
{
	Context *context = libEGL->clientGetCurrentContext();

    return context ? context->getClientVersion() : 0;
}
}

egl::Context *es2CreateContext(const egl::Config *config, const egl::Context *shareContext, int clientVersion);
extern "C" __eglMustCastToProperFunctionPointerType es2GetProcAddress(const char *procname);
egl::Image *createBackBuffer(int width, int height, const egl::Config *config);
egl::Image *createDepthStencil(unsigned int width, unsigned int height, sw::Format format, int multiSampleDepth, bool discard);
sw::FrameBuffer *createFrameBuffer(EGLNativeDisplayType display, EGLNativeWindowType window, int width, int height);

LibGLESv2exports::LibGLESv2exports()
{
	this->es2CreateContext = ::es2CreateContext;
	this->es2GetProcAddress = ::es2GetProcAddress;
	this->createBackBuffer = ::createBackBuffer;
	this->createDepthStencil = ::createDepthStencil;
	this->createFrameBuffer = ::createFrameBuffer;
}

extern "C" LibGLESv2exports *libGLESv2exports()
{
	static LibGLESv2exports libGLESv2;
	return &libGLESv2;
}

LibEGL libEGL;
LibGLES_CM libGLES_CM;