dolphin/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

// Copyright (C) 2003-2008 Dolphin Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/


#include "Globals.h"
#include <list>
#include <vector>
#include <cmath>

#include "GLUtil.h"

#include <Cg/cg.h>
#include <Cg/cgGL.h>

#ifdef _WIN32
#include <mmsystem.h>
#endif

#include "Config.h"
#include "Profiler.h"
#include "Statistics.h"
#include "ImageWrite.h"
#include "Render.h"
#include "OpcodeDecoding.h"
#include "BPStructs.h"
#include "TextureMngr.h"
#include "rasterfont.h"
#include "VertexShaderGen.h"
#include "PixelShaderCache.h"
#include "PixelShaderManager.h"
#include "VertexLoaderManager.h"
#include "VertexLoader.h"
#include "XFB.h"
#include "Timer.h"

#include "main.h" // Local
#ifdef _WIN32
#include "OS/Win32.h"
#endif

#ifdef _WIN32
	#include "Win32Window.h" // warning: crapcode
#else
#endif

struct MESSAGE
{
    MESSAGE() {}
    MESSAGE(const char* p, u32 dw) { strcpy(str, p); dwTimeStamp = dw; }
    char str[255];
    u32 dwTimeStamp;
};	

CGcontext g_cgcontext;
CGprofile g_cgvProf;
CGprofile g_cgfProf;

static RasterFont* s_pfont = NULL;
static std::list<MESSAGE> s_listMsgs;

static bool s_bFullscreen = false;
static bool s_bOutputCgErrors = true;

static int nZBufferRender = 0; // if > 0, then use zbuffer render, and count down.

// A framebuffer is a set of render targets: a color and a z buffer. They can be either RenderBuffers or Textures.
static GLuint s_uFramebuffer = 0;

// The size of these should be a (not necessarily even) multiple of the EFB size, 640x528, but isn'.t
static GLuint s_RenderTarget = 0;
static GLuint s_DepthTarget = 0;
static GLuint s_ZBufferTarget = 0;

static bool s_bATIDrawBuffers = false;
static bool s_bHaveStencilBuffer = false;

static Renderer::RenderMode s_RenderMode = Renderer::RM_Normal;
bool g_bBlendSeparate = false;
int frameCount;

void HandleCgError(CGcontext ctx, CGerror err, void *appdata);

static const GLenum glSrcFactors[8] =
{
    GL_ZERO,
    GL_ONE,
    GL_DST_COLOR,
    GL_ONE_MINUS_DST_COLOR,
    GL_SRC_ALPHA,
    GL_ONE_MINUS_SRC_ALPHA, 
    GL_DST_ALPHA,
    GL_ONE_MINUS_DST_ALPHA
};

static const GLenum glDestFactors[8] = {
    GL_ZERO, GL_ONE, GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR,
    GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,  GL_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA
};

static u32 s_blendMode;

bool Renderer::Init()
{
    bool bSuccess = true;
	int numvertexattribs = 0;
    GLenum err = GL_NO_ERROR;
    g_cgcontext = cgCreateContext();

    cgGetError();
    cgSetErrorHandler(HandleCgError, NULL);

    // fill the opengl extension map
    const char* ptoken = (const char*)glGetString(GL_EXTENSIONS);
    if (ptoken == NULL) return false;

    INFO_LOG("Supported OpenGL Extensions:\n");
    INFO_LOG(ptoken);  // write to the log file
    INFO_LOG("\n");

	if (GLEW_EXT_blend_func_separate && GLEW_EXT_blend_equation_separate)
        g_bBlendSeparate = true;

	//Checks if it ONLY has the ATI_draw_buffers extension, some have both
    if (GLEW_ATI_draw_buffers && !GLEW_ARB_draw_buffers) 
        s_bATIDrawBuffers = true;

    s_bFullscreen = g_Config.bFullscreen;

    if (glewInit() != GLEW_OK) {
        ERROR_LOG("glewInit() failed!\nDoes your video card support OpenGL 2.x?");
        return false;
    }

    if (!GLEW_EXT_framebuffer_object) {
        ERROR_LOG("*********\nGPU: ERROR: Need GL_EXT_framebufer_object for multiple render targets\nGPU: *********\nDoes your video card support OpenGL 2.x?");
        bSuccess = false;
    }
    
    if (!GLEW_EXT_secondary_color) {
        ERROR_LOG("*********\nGPU: OGL ERROR: Need GL_EXT_secondary_color\nGPU: *********\nDoes your video card support OpenGL 2.x?");
        bSuccess = false;
    }

    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, (GLint *)&numvertexattribs);

    if (numvertexattribs < 11) {
        ERROR_LOG("*********\nGPU: OGL ERROR: Number of attributes %d not enough\nGPU: *********\nDoes your video card support OpenGL 2.x?", numvertexattribs);
        bSuccess = false;
    }

    if (!bSuccess)
        return false;

#ifdef _WIN32
    if (WGLEW_EXT_swap_control)
        wglSwapIntervalEXT(0);
    else
        ERROR_LOG("no support for SwapInterval (framerate clamped to monitor refresh rate)\nDoes your video card support OpenGL 2.x?");
#elif defined(HAVE_X11) && HAVE_X11
    if (glXSwapIntervalSGI)
       glXSwapIntervalSGI(0);
    else
        ERROR_LOG("no support for SwapInterval (framerate clamped to monitor refresh rate)\n");
#else

	//TODO

#endif

    // check the max texture width and height
	GLint max_texture_size;
	glGetIntegerv(GL_MAX_TEXTURE_SIZE, (GLint *)&max_texture_size);
	if (max_texture_size < 1024) {
		ERROR_LOG("GL_MAX_TEXTURE_SIZE too small at %i - must be at least 1024", max_texture_size);
	}

    GL_REPORT_ERROR();
    if (err != GL_NO_ERROR) bSuccess = false;

    if (glDrawBuffers == NULL && !GLEW_ARB_draw_buffers)
        glDrawBuffers = glDrawBuffersARB;

    glGenFramebuffersEXT(1, (GLuint *)&s_uFramebuffer);
    if (s_uFramebuffer == 0) {
        ERROR_LOG("failed to create the renderbuffer\nDoes your video card support OpenGL 2.x?");
    }

    _assert_(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT);
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, s_uFramebuffer);

	// The size of the framebuffer targets should really NOT be the size of the OpenGL viewport.
	// The EFB is larger than 640x480 - in fact, it's 640x528, give or take a couple of lines.
	// So the below is wrong.
    int nBackbufferWidth = (int)OpenGL_GetWidth();
    int nBackbufferHeight = (int)OpenGL_GetHeight();
    
    // Create the framebuffer target
    glGenTextures(1, (GLuint *)&s_RenderTarget);
	glBindTexture(GL_TEXTURE_RECTANGLE_ARB, s_RenderTarget);

	// Setup the texture params
    // initialize to default
    glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 4, nBackbufferWidth, nBackbufferHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    if (glGetError() != GL_NO_ERROR) {
        glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP);
        glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP);
        GL_REPORT_ERROR();
    }
    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    GL_REPORT_ERROR();

    int nMaxMRT = 0;
    glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, (GLint *)&nMaxMRT);

    if (nMaxMRT > 1) 
	{
        // create zbuffer target
        glGenTextures(1, (GLuint *)&s_ZBufferTarget);
        glBindTexture(GL_TEXTURE_RECTANGLE_ARB, s_ZBufferTarget);
        glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 4, nBackbufferWidth, nBackbufferHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

        glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        if (glGetError() != GL_NO_ERROR) {
            glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP);
            glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP);
            GL_REPORT_ERROR();
        }
        glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    }

    // create the depth buffer
    glGenRenderbuffersEXT(1, (GLuint *)&s_DepthTarget);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, s_DepthTarget);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, nBackbufferWidth, nBackbufferHeight);
    
    if (glGetError() != GL_NO_ERROR) 
	{
        glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, nBackbufferWidth, nBackbufferHeight);
        s_bHaveStencilBuffer = false;
    } 
	else 
	{
		s_bHaveStencilBuffer = true;
	}

    GL_REPORT_ERROR();

    // set as render targets
    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_ARB, s_RenderTarget, 0);
    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, s_DepthTarget);
    
	GL_REPORT_ERROR();

    if (s_ZBufferTarget != 0) {
        // test to make sure it works
        glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_RECTANGLE_ARB, s_ZBufferTarget, 0);
        bool bFailed = glGetError() != GL_NO_ERROR || glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) != GL_FRAMEBUFFER_COMPLETE_EXT;
        glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_RECTANGLE_ARB, 0, 0);
            
        if (bFailed) {
            glDeleteTextures(1, (GLuint *)&s_ZBufferTarget);
            s_ZBufferTarget = 0;
        }
    }

	if (s_ZBufferTarget == 0)
        ERROR_LOG("disabling ztarget mrt feature (max mrt=%d)\n", nMaxMRT);

	// Why is this left here?
    //glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, s_DepthTarget);

    glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
    nZBufferRender = 0;

    GL_REPORT_ERROR();
    if (err != GL_NO_ERROR)
		bSuccess = false;

    s_pfont = new RasterFont();

    // load the effect, find the best profiles (if any)
    if (cgGLIsProfileSupported(CG_PROFILE_ARBVP1) != CG_TRUE) {
        ERROR_LOG("arbvp1 not supported\n");
        return false;
    }

    if (cgGLIsProfileSupported(CG_PROFILE_ARBFP1) != CG_TRUE) {
        ERROR_LOG("arbfp1 not supported\n");
        return false;
    }

    g_cgvProf = cgGLGetLatestProfile(CG_GL_VERTEX);
    g_cgfProf = cgGLGetLatestProfile(CG_GL_FRAGMENT);
    cgGLSetOptimalOptions(g_cgvProf);
    cgGLSetOptimalOptions(g_cgfProf);

    //ERROR_LOG("max buffer sizes: %d %d\n", cgGetProgramBufferMaxSize(g_cgvProf), cgGetProgramBufferMaxSize(g_cgfProf));
    int nenvvertparams, nenvfragparams, naddrregisters[2];
    glGetProgramivARB(GL_VERTEX_PROGRAM_ARB, GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, (GLint *)&nenvvertparams);
    glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB, GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, (GLint *)&nenvfragparams);
    glGetProgramivARB(GL_VERTEX_PROGRAM_ARB, GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB, (GLint *)&naddrregisters[0]);
    glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB, GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB, (GLint *)&naddrregisters[1]);
    DEBUG_LOG("max program env parameters: vert=%d, frag=%d\n", nenvvertparams, nenvfragparams);
    DEBUG_LOG("max program address register parameters: vert=%d, frag=%d\n", naddrregisters[0], naddrregisters[1]);

	if (nenvvertparams < 238)
        ERROR_LOG("not enough vertex shader environment constants!!\n");

#ifndef _DEBUG
    cgGLSetDebugMode(GL_FALSE);
#endif

    if (cgGetError() != CG_NO_ERROR) {
        ERROR_LOG("cg error\n");
        return false;
    }
    
    s_RenderMode = Renderer::RM_Normal;

    if (!InitializeGL())
        return false;

	XFB_Init();
    return glGetError() == GL_NO_ERROR && bSuccess;
}
void Renderer::Shutdown(void)
{    
    delete s_pfont;
	s_pfont = 0;

	XFB_Shutdown();

    if (g_cgcontext) {
        cgDestroyContext(g_cgcontext);
        g_cgcontext = 0;
    }
    if (s_RenderTarget) {
        glDeleteTextures(1, &s_RenderTarget);
        s_RenderTarget = 0;
    }
    if (s_DepthTarget) {
        glDeleteRenderbuffersEXT(1, &s_DepthTarget);
		s_DepthTarget = 0;
    }
    if (s_uFramebuffer) {
        glDeleteFramebuffersEXT(1, &s_uFramebuffer);
        s_uFramebuffer = 0;
    }
}

bool Renderer::InitializeGL()
{
    glStencilFunc(GL_ALWAYS, 0, 0);
    glBlendFunc(GL_ONE, GL_ONE);

    glViewport(0, 0, GetTargetWidth(), GetTargetHeight()); // Reset The Current Viewport

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glShadeModel(GL_SMOOTH);
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClearDepth(1.0f);
    glEnable(GL_DEPTH_TEST);
    glDisable(GL_LIGHTING);
    glDepthFunc(GL_LEQUAL);
    
    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);  // 4-byte pixel alignment
    
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);  // perspective correct interpolation of colors and tex coords
    glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
    glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
    
    glDisable(GL_STENCIL_TEST);
    glEnable(GL_SCISSOR_TEST);
	// Do we really need to set this initial glScissor() value? Wont it be called all the time while the game is running?
    //glScissor(0, 0, (int)OpenGL_GetWidth(), (int)OpenGL_GetHeight());
    glBlendColorEXT(0, 0, 0, 0.5f);
    glClearDepth(1.0f);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    // legacy multitexturing: select texture channel only.
    glActiveTexture(GL_TEXTURE0);
    glClientActiveTexture(GL_TEXTURE0);
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

    GLenum err = GL_NO_ERROR;
    GL_REPORT_ERROR();

    return err == GL_NO_ERROR;
}

void Renderer::AddMessage(const char* pstr, u32 ms)
{
    s_listMsgs.push_back(MESSAGE(pstr, timeGetTime() + ms));
}

void Renderer::ProcessMessages()
{
	GLboolean wasEnabled = glIsEnabled(GL_BLEND);

	if (!wasEnabled) glEnable(GL_BLEND);
    
	if (s_listMsgs.size() > 0) {
        int left = 25, top = 15;
		std::list<MESSAGE>::iterator it = s_listMsgs.begin();
        while (it != s_listMsgs.end()) 
		{
			int time_left = (int)(it->dwTimeStamp - timeGetTime());
			int alpha = 255;

			if (time_left < 1024)
			{
				alpha = time_left >> 2;
				if (time_left < 0) alpha = 0;
			}

			alpha <<= 24;

            RenderText(it->str, left+1, top+1, 0x000000|alpha);
            RenderText(it->str, left, top, 0xffff30|alpha);
            top += 15;

            if (time_left <= 0)
                it = s_listMsgs.erase(it);
            else ++it;
        }
    }

	if (!wasEnabled) glDisable(GL_BLEND);
}

void Renderer::RenderText(const char* pstr, int left, int top, u32 color)
{
    int nBackbufferWidth = (int)OpenGL_GetWidth();
    int nBackbufferHeight = (int)OpenGL_GetHeight();
    glColor4f(
		((color>>16) & 0xff)/255.0f,
		((color>> 8) & 0xff)/255.0f,
		((color>> 0) & 0xff)/255.0f,
		((color>>24) & 0xFF)/255.0f
		);
    s_pfont->printMultilineText(pstr, left * 2.0f / (float)nBackbufferWidth - 1, 1 - top * 2.0f / (float)nBackbufferHeight,0,nBackbufferWidth,nBackbufferHeight);
}

//////////////////////////////////////////////////////////////////////////////////////
// Return the rendering window width and height
// ------------------------
int Renderer::GetTargetWidth()
{
    return (g_Config.bStretchToFit ? 640 : (int)OpenGL_GetWidth());
}

int Renderer::GetTargetHeight()
{
    return (g_Config.bStretchToFit ? 480 : (int)OpenGL_GetHeight());
}
/////////////////////////////


void Renderer::SetRenderTarget(GLuint targ)
{
	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_ARB,
		targ != 0 ? targ : s_RenderTarget, 0);
}

void Renderer::SetDepthTarget(GLuint targ)
{
	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT,
		targ != 0 ? targ : s_DepthTarget);
}

void Renderer::SetFramebuffer(GLuint fb)
{
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,
		fb != 0 ? fb : s_uFramebuffer);
}

GLuint Renderer::GetRenderTarget()
{
	return s_RenderTarget;
}
GLuint Renderer::GetZBufferTarget()
{
	return nZBufferRender > 0 ? s_ZBufferTarget : 0;
}

void Renderer::ResetGLState()
{
    glDisable(GL_SCISSOR_TEST);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_CULL_FACE);
    glDisable(GL_BLEND);
    glDepthMask(GL_FALSE);
    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);

    glDisable(GL_VERTEX_PROGRAM_ARB);
    glDisable(GL_FRAGMENT_PROGRAM_ARB);
}

void Renderer::RestoreGLState()
{
    glEnable(GL_SCISSOR_TEST);

    if (bpmem.genMode.cullmode > 0) glEnable(GL_CULL_FACE);
    if (bpmem.zmode.testenable) glEnable(GL_DEPTH_TEST);
    if (bpmem.zmode.updateenable) glDepthMask(GL_TRUE);

    glEnable(GL_VERTEX_PROGRAM_ARB);
    glEnable(GL_FRAGMENT_PROGRAM_ARB);
    SetColorMask();
	SetBlendMode(true);
}

void Renderer::SetColorMask()
{
    if (bpmem.blendmode.alphaupdate && bpmem.blendmode.colorupdate)
        glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
    else if (bpmem.blendmode.alphaupdate)
        glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_TRUE);
    else if (bpmem.blendmode.colorupdate) 
        glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_FALSE);
}

void Renderer::SetBlendMode(bool forceUpdate)
{	
	// blend mode bit mask
	// 0 - blend enable
	// 1 - dst alpha enable
	// 2 - reverse subtract enable (else add)
	// 3-5 - srcRGB function
	// 6-8 - dstRGB function
	// 9-16 - dstAlpha

	u32 newval = bpmem.blendmode.subtract << 2;

	if (g_bBlendSeparate) {
		newval |= bpmem.dstalpha.enable ? 3 : 0;
		newval |= bpmem.dstalpha.alpha << 9;
	}

	if (bpmem.blendmode.blendenable) {		
		newval |= 1;

		if (bpmem.blendmode.subtract) {
			newval |= 0x0048; // src 1 dst 1
		} else {
			newval |= bpmem.blendmode.srcfactor << 3;
			newval |= bpmem.blendmode.dstfactor << 6;
		}
	} else {
		newval |= 0x0008;	// src 1 dst 0
	}

	u32 changes = forceUpdate ? 0xFFFFFFFF : newval ^ s_blendMode;

	if (changes & 1) {
		newval & 1 ? glEnable(GL_BLEND) : glDisable(GL_BLEND);
	}

	bool dstAlphaEnable = g_bBlendSeparate && newval & 2;

	if (changes & 6) {		
		// dst alpha enable or subtract enable change
		if (dstAlphaEnable)
			glBlendEquationSeparate(newval & 4 ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD, GL_FUNC_ADD);
		else
			glBlendEquation(newval & 4 ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD);
	}

	if (changes & 0x1FA) {
		// dst alpha enable or blend RGB change
		if (dstAlphaEnable)
			glBlendFuncSeparate(glSrcFactors[(newval >> 3) & 7], glDestFactors[(newval >> 6) & 7], GL_CONSTANT_ALPHA, GL_ZERO);
		else
			glBlendFunc(glSrcFactors[(newval >> 3) & 7], glDestFactors[(newval >> 6) & 7]);
	}

	if (dstAlphaEnable && changes & 0x1FE00) {
		// dst alpha color change
		glBlendColor(0, 0, 0, (float)bpmem.dstalpha.alpha / 255.0f);
	}

	s_blendMode = newval;
}

////////////////////////////////////////////////////////////////////////////////////////////
// Call browser: OpcodeDecoding.cpp ExecuteDisplayList > Decode() > LoadBPReg()
//		case 0x52 > SetScissorRect()
// ---------------
// This function handles the OpenGL glScissor() function
// ---------------
// bpmem.scissorTL.x, y = 342x342
// bpmem.scissorBR.x, y = 981x821
// Renderer::GetTargetHeight() = the fixed ini file setting
// donkopunchstania - it appears scissorBR is the bottom right pixel inside the scissor box
// therefore the width and height are (scissorBR + 1) - scissorTL
// ---------------
bool Renderer::SetScissorRect()
{
    int xoff = bpmem.scissorOffset.x * 2 - 342;
    int yoff = bpmem.scissorOffset.y * 2 - 342;
    float MValueX = OpenGL_GetXmax();
    float MValueY = OpenGL_GetYmax();
	float rc_left = (float)bpmem.scissorTL.x - xoff - 342; // left = 0
	rc_left *= MValueX;
	if (rc_left < 0) rc_left = 0;

	float rc_top = (float)bpmem.scissorTL.y - yoff - 342; // right = 0
	rc_top *= MValueY;
	if (rc_top < 0) rc_top = 0;
    
	float rc_right = (float)bpmem.scissorBR.x - xoff - 341; // right = 640
	rc_right *= MValueX;
	if (rc_right > 640 * MValueX) rc_right = 640 * MValueX;

	float rc_bottom = (float)bpmem.scissorBR.y - yoff - 341; // bottom = 480
	rc_bottom *= MValueY;
	if (rc_bottom > 480 * MValueY) rc_bottom = 480 * MValueY;

   /*LOG("Scissor: lt=(%d,%d), rb=(%d,%d,%i), off=(%d,%d)\n",
		rc_left, rc_top,
		rc_right, rc_bottom, Renderer::GetTargetHeight(),
		xoff, yoff
		);*/

	// Check that the coordinates are good
    if (rc_right >= rc_left && rc_bottom >= rc_top)
	{
		// -----------------------------------------------------------------------
		// XFB supplement, fix the black borders problem
		// ------------------
		// See comment in UpdateViewport() about why I don't the XFB supplement to these options
		//if(g_Config.bStretchToFit && !g_Config.bUseXFB)
		if(false)
		{
			int WidthDifference = 640 - (int)(rc_right - rc_left);
			int HeightDifference = 480 - (int)(rc_bottom - rc_top);

			GLScissorX = (int)rc_left; GLScissorY = -(Renderer::GetTargetHeight() - (int)(rc_bottom));
			GLScissorW = Renderer::GetTargetWidth() + WidthDifference; GLScissorH = Renderer::GetTargetHeight() + HeightDifference;
		}
		// ------------------------
		else
		{
			GLScissorX = (int)rc_left; GLScissorY = Renderer::GetTargetHeight() - (int)(rc_bottom);
			GLScissorW = (int)(rc_right - rc_left); GLScissorH = (int)(rc_bottom - rc_top);
		}

        glScissor(
			GLScissorX, // x = 0
			GLScissorY, // y = 0
			GLScissorW, // width = 640 for example
			GLScissorH // height = 480 for example
			); 
        return true;
    }

    return false;
}

bool Renderer::IsUsingATIDrawBuffers()
{
    return s_bATIDrawBuffers;
}

bool Renderer::HaveStencilBuffer()
{
    return s_bHaveStencilBuffer;
}

void Renderer::SetZBufferRender()
{
    nZBufferRender = 10; // give it 10 frames
    GLenum s_drawbuffers[2] = {
		GL_COLOR_ATTACHMENT0_EXT,
		GL_COLOR_ATTACHMENT1_EXT
	};
    glDrawBuffers(2, s_drawbuffers);
    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_RECTANGLE_ARB, s_ZBufferTarget, 0);
    _assert_(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT);
}

void Renderer::FlushZBufferAlphaToTarget()
{
    ResetGLState();

    SetRenderTarget(0);
    glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);

    glViewport(0, 0, GetTargetWidth(), GetTargetHeight());

    // texture map s_RenderTargets[s_curtarget] onto the main buffer
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, s_ZBufferTarget);
    TextureMngr::EnableTexRECT(0);
    // disable all other stages
    for (int i = 1; i < 8; ++i)
		TextureMngr::DisableStage(i);
    GL_REPORT_ERRORD();

	// setup the stencil to only accept pixels that have been written
	glStencilFunc(GL_EQUAL, 1, 0xff);
	glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);

	// TODO: This code should not have to bother with stretchtofit checking - 
	// all necessary scale initialization should be done elsewhere.
	// TODO: Investigate BlitFramebufferEXT.
	if (g_Config.bStretchToFit)
	{
		//TODO: Do Correctly in a bit
        float FactorW = 640.f / (float)OpenGL_GetWidth();
		float FactorH = 480.f / (float)OpenGL_GetHeight();

		float Max = (FactorW < FactorH) ? FactorH : FactorW;
		float Temp = 1.0f / Max;
		FactorW *= Temp;
		FactorH *= Temp;

		glBegin(GL_QUADS);
		glTexCoord2f(0, 0); glVertex2f(-FactorW,-FactorH);
		glTexCoord2f(0, (float)GetTargetHeight()); glVertex2f(-FactorW,FactorH);
		glTexCoord2f((float)GetTargetWidth(), (float)GetTargetHeight()); glVertex2f(FactorW,FactorH);
		glTexCoord2f((float)GetTargetWidth(), 0); glVertex2f(FactorW,-FactorH);
	    glEnd();
	}
	else
	{		
		glBegin(GL_QUADS);
		glTexCoord2f(0, 0); glVertex2f(-1,-1);
		glTexCoord2f(0, (float)(GetTargetHeight())); glVertex2f(-1,1);
		glTexCoord2f((float)(GetTargetWidth()), (float)(GetTargetHeight())); glVertex2f(1,1);
		glTexCoord2f((float)(GetTargetWidth()), 0); glVertex2f(1,-1);
	    glEnd();
	}
    
    GL_REPORT_ERRORD();

    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
    RestoreGLState();
}

void Renderer::SetRenderMode(RenderMode mode)
{
    if (!s_bHaveStencilBuffer && mode == RM_ZBufferAlpha)
        mode = RM_ZBufferOnly;

    if (s_RenderMode == mode)
        return;

    if (mode == RM_Normal) {
        // flush buffers
        if (s_RenderMode == RM_ZBufferAlpha) {
            FlushZBufferAlphaToTarget();
            glDisable(GL_STENCIL_TEST);
        }
        SetColorMask();
        SetRenderTarget(0);
        SetZBufferRender();
        GL_REPORT_ERRORD();
    }
    else if (s_RenderMode == RM_Normal) {
        // setup buffers
        _assert_(GetZBufferTarget() && bpmem.zmode.updateenable);

        if (mode == RM_ZBufferAlpha) {
            glEnable(GL_STENCIL_TEST);
            glClearStencil(0);
            glClear(GL_STENCIL_BUFFER_BIT);
            glStencilFunc(GL_ALWAYS, 1, 0xff);
            glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
        }

        glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
        GL_REPORT_ERRORD();
    }
    else {
        _assert_(GetZBufferTarget());
        _assert_(s_bHaveStencilBuffer);

        if (mode == RM_ZBufferOnly) {
            // flush and remove stencil
            _assert_(s_RenderMode==RM_ZBufferAlpha);
            FlushZBufferAlphaToTarget();
            glDisable(GL_STENCIL_TEST);

            SetRenderTarget(s_ZBufferTarget);
            glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
            GL_REPORT_ERRORD();
        }
        else {
            _assert_(mode == RM_ZBufferAlpha && s_RenderMode == RM_ZBufferOnly);
            
            // setup stencil
            glEnable(GL_STENCIL_TEST);
            glClearStencil(0);
            glClear(GL_STENCIL_BUFFER_BIT);
            glStencilFunc(GL_ALWAYS, 1, 0xff);
            glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
        }
    }

    s_RenderMode = mode;
}

Renderer::RenderMode Renderer::GetRenderMode()
{
    return s_RenderMode;
}

void Renderer::Swap(const TRectangle& rc)
{
    OpenGL_Update(); // just updates the render window position and the backbuffer size

    DVSTARTPROFILE();

    Renderer::SetRenderMode(Renderer::RM_Normal);

#if 0
	// Blit the FBO to do Anti-Aliasing
	// Not working?
	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, s_uFramebuffer); 
	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
	glBlitFramebufferEXT(0, 0, 640, 480, 0, 0, OpenGL_GetWidth(), OpenGL_GetHeight(), GL_COLOR_BUFFER_BIT, GL_NEAREST);
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, s_uFramebuffer); 

#else
	// render to the real buffer now 
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); // switch to the backbuffer
    glViewport(OpenGL_GetXoff(), OpenGL_GetYoff(), (int)OpenGL_GetWidth(), (int)OpenGL_GetHeight());

    ResetGLState();

    // texture map s_RenderTargets[s_curtarget] onto the main buffer
    glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_RECTANGLE_ARB, s_RenderTarget);
    TextureMngr::EnableTexRECT(0);
    
	// disable all other stages
    for (int i = 1; i < 8; ++i)
		TextureMngr::DisableStage(i);

    GL_REPORT_ERRORD();

	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glBegin(GL_QUADS);
    glTexCoord2f(0, 0);                                              glVertex2f(-1,-1);
    glTexCoord2f(0, (float)GetTargetHeight());                       glVertex2f(-1,1);
    glTexCoord2f((float)GetTargetWidth(), (float)GetTargetHeight()); glVertex2f(1,1);
    glTexCoord2f((float)GetTargetWidth(), 0);                        glVertex2f(1,-1);
    glEnd();

	// Wireframe
	if (g_Config.bWireFrame)
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
    TextureMngr::DisableStage(0);

    SwapBuffers();

    RestoreGLState();
#endif
	GL_REPORT_ERRORD();

    g_Config.iSaveTargetId = 0;

    // for testing zbuffer targets
    //Renderer::SetZBufferRender();
    //SaveTexture("tex.tga", GL_TEXTURE_RECTANGLE_ARB, s_ZBufferTarget, GetTargetWidth(), GetTargetHeight());
}

void Renderer::SwapBuffers()
{
	static int fpscount;
    static int s_fps;
    static unsigned long lasttime;
	char debugtext_buffer[8192];
	char *p = debugtext_buffer;
	p[0] = 0;

    ++fpscount;
    if (timeGetTime() - lasttime > 1000) 
    {
        lasttime = timeGetTime();
        s_fps = fpscount;
        fpscount = 0;
    }

	if (g_Config.bShowFPS)
    {
		p+=sprintf(p, "FPS: %d\n", s_fps);
    }

    if (g_Config.bOverlayStats) {
        p+=sprintf(p,"textures created: %i\n",stats.numTexturesCreated);
        p+=sprintf(p,"textures alive:   %i\n",stats.numTexturesAlive);
        p+=sprintf(p,"pshaders created: %i\n",stats.numPixelShadersCreated);
        p+=sprintf(p,"pshaders alive:   %i\n",stats.numPixelShadersAlive);
        p+=sprintf(p,"vshaders created: %i\n",stats.numVertexShadersCreated);
        p+=sprintf(p,"vshaders alive:   %i\n",stats.numVertexShadersAlive);
        p+=sprintf(p,"dlists called:    %i\n",stats.numDListsCalled);
        p+=sprintf(p,"dlists called(f): %i\n",stats.thisFrame.numDListsCalled);
		// not used.
        //p+=sprintf(p,"dlists created:  %i\n",stats.numDListsCreated);
        //p+=sprintf(p,"dlists alive:    %i\n",stats.numDListsAlive);
        //p+=sprintf(p,"strip joins:     %i\n",stats.numJoins);
        p+=sprintf(p,"primitives:       %i\n",stats.thisFrame.numPrims);
		p+=sprintf(p,"primitive joins:  %i\n",stats.thisFrame.numPrimitiveJoins);
		p+=sprintf(p,"buffer splits:    %i\n",stats.thisFrame.numBufferSplits);
		p+=sprintf(p,"draw calls:       %i\n",stats.thisFrame.numDrawCalls);
        p+=sprintf(p,"primitives (DL):  %i\n",stats.thisFrame.numDLPrims);
        p+=sprintf(p,"XF loads:         %i\n",stats.thisFrame.numXFLoads);
        p+=sprintf(p,"XF loads (DL):    %i\n",stats.thisFrame.numXFLoadsInDL);
        p+=sprintf(p,"CP loads:         %i\n",stats.thisFrame.numCPLoads);
        p+=sprintf(p,"CP loads (DL):    %i\n",stats.thisFrame.numCPLoadsInDL);
        p+=sprintf(p,"BP loads:         %i\n",stats.thisFrame.numBPLoads);
        p+=sprintf(p,"BP loads (DL):    %i\n",stats.thisFrame.numBPLoadsInDL);
        p+=sprintf(p,"vertex loaders:   %i\n",stats.numVertexLoaders);

		std::string text1;
		VertexLoaderManager::AppendListToString(&text1);
		p+=sprintf(p,"%s",text1.c_str());
    }

	if (g_Config.bOverlayBlendStats)
	{
		p+=sprintf(p,"LogicOp Mode: %i\n", stats.logicOpMode);
		p+=sprintf(p,"Source Factor: %i\n", stats.srcFactor);
		p+=sprintf(p,"Destination Factor: %i\n", stats.dstFactor);
		p+=sprintf(p,"Dithering: %s\n", stats.dither==1 ? "Enabled" : "Disabled");
		p+=sprintf(p,"Color Update: %s\n", stats.colorUpdate==1 ? "Enabled" : "Disabled");
		p+=sprintf(p,"Alpha Update: %s\n", stats.alphaUpdate==1 ? "Enabled" : "Disabled");
		p+=sprintf(p,"Dst Alpha Enabled: %s\n", stats.dstAlphaEnable==1 ? "Enabled" : "Disabled");
		p+=sprintf(p,"Dst Alpha: %08x\n", stats.dstAlpha);
		
	}

	if (g_Config.bOverlayProjStats)
	{
		p+=sprintf(p,"Projection #: X for Raw 6=0 (X for Raw 6!=0)\n\n");
		p+=sprintf(p,"Projection 0: %f (%f) Raw 0: %f\n", stats.gproj_0, stats.g2proj_0, stats.proj_0);
		p+=sprintf(p,"Projection 1: %f (%f)\n", stats.gproj_1, stats.g2proj_1);
		p+=sprintf(p,"Projection 2: %f (%f) Raw 1: %f\n", stats.gproj_2, stats.g2proj_2, stats.proj_1);
		p+=sprintf(p,"Projection 3: %f (%f)\n\n", stats.gproj_3, stats.g2proj_3);
		p+=sprintf(p,"Projection 4: %f (%f)\n", stats.gproj_4, stats.g2proj_4);
		p+=sprintf(p,"Projection 5: %f (%f) Raw 2: %f\n", stats.gproj_5, stats.g2proj_5, stats.proj_2);
		p+=sprintf(p,"Projection 6: %f (%f) Raw 3: %f\n", stats.gproj_6, stats.g2proj_6, stats.proj_3);
		p+=sprintf(p,"Projection 7: %f (%f)\n\n", stats.gproj_7, stats.g2proj_7);
		p+=sprintf(p,"Projection 8: %f (%f)\n", stats.gproj_8, stats.g2proj_8);
		p+=sprintf(p,"Projection 9: %f (%f)\n", stats.gproj_9, stats.g2proj_9);
		p+=sprintf(p,"Projection 10: %f (%f) Raw 4: %f\n\n", stats.gproj_10, stats.g2proj_10, stats.proj_4);
		p+=sprintf(p,"Projection 11: %f (%f) Raw 5: %f\n\n", stats.gproj_11, stats.g2proj_11, stats.proj_5);
		p+=sprintf(p,"Projection 12: %f (%f)\n", stats.gproj_12, stats.g2proj_12);
		p+=sprintf(p,"Projection 13: %f (%f)\n", stats.gproj_13, stats.g2proj_13);
		p+=sprintf(p,"Projection 14: %f (%f)\n", stats.gproj_14, stats.g2proj_14);
		p+=sprintf(p,"Projection 15: %f (%f)\n", stats.gproj_15, stats.g2proj_15);
	}

	// Render a shadow, and then the text.
	Renderer::RenderText(debugtext_buffer, 21, 21, 0xDD000000);
	Renderer::RenderText(debugtext_buffer, 20, 20, 0xFF00FFFF);

	Renderer::ProcessMessages();

#if defined(DVPROFILE)
    if (g_bWriteProfile) {
        //g_bWriteProfile = 0;
        static int framenum = 0;
        const int UPDATE_FRAMES = 8;
        if (++framenum >= UPDATE_FRAMES) {
            DVProfWrite("prof.txt", UPDATE_FRAMES);
            DVProfClear();
            framenum = 0;
        }
    }
#endif

    // Copy the rendered frame to the real window
	OpenGL_SwapBuffers();

	glClearColor(0,0,0,0);
	glClear(GL_COLOR_BUFFER_BIT);

    GL_REPORT_ERRORD();

    // Clean out old stuff from caches
    PixelShaderCache::Cleanup();
    TextureMngr::Cleanup();

    frameCount++;

    // New frame
    stats.ResetFrame();

	// Render to the framebuffer.
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, s_uFramebuffer);
   
    if (nZBufferRender > 0) {
        if (--nZBufferRender == 0) {
            // turn off
            nZBufferRender = 0;
            glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
            glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_RECTANGLE_ARB, 0, 0);
            Renderer::SetRenderMode(RM_Normal);  // turn off any zwrites
        }
    }
}

bool Renderer::SaveRenderTarget(const char* filename, int jpeg)
{
    bool bflip = true;
    int nBackbufferHeight = (int)OpenGL_GetHeight();
    int nBackbufferWidth = (int)OpenGL_GetWidth();

    std::vector<u32> data(nBackbufferWidth * nBackbufferHeight);
    glReadPixels(0, 0, nBackbufferWidth, nBackbufferHeight, GL_BGRA, GL_UNSIGNED_BYTE, &data[0]);
    if (glGetError() != GL_NO_ERROR)
        return false;

    if (bflip) {
        // swap scanlines
        std::vector<u32> scanline(nBackbufferWidth);
        for (int i = 0; i < nBackbufferHeight/2; ++i) {
            memcpy(&scanline[0], &data[i*nBackbufferWidth], nBackbufferWidth*4);
            memcpy(&data[i*nBackbufferWidth], &data[(nBackbufferHeight-i-1)*nBackbufferWidth], nBackbufferWidth*4);
            memcpy(&data[(nBackbufferHeight-i-1)*nBackbufferWidth], &scanline[0], nBackbufferWidth*4);
        }
    }
    
    return SaveTGA(filename, nBackbufferWidth, nBackbufferHeight, &data[0]);
}

void Renderer::SetCgErrorOutput(bool bOutput)
{
    s_bOutputCgErrors = bOutput;
}

void HandleGLError()
{
    const GLubyte* pstr = glGetString(GL_PROGRAM_ERROR_STRING_ARB);
    if (pstr != NULL && pstr[0] != 0)
	{
        GLint loc = 0;
        glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &loc);
        ERROR_LOG("program error at %d: ", loc);
        ERROR_LOG((char*)pstr);
        ERROR_LOG("\n");
    }

    // check the error status of this framebuffer */
    GLenum error = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);

    // if error != GL_FRAMEBUFFER_COMPLETE_EXT, there's an error of some sort 
    if (!error)
		return;

// What is this for?
//	int w, h;
//	GLint fmt;
//	glGetRenderbufferParameterivEXT(GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_INTERNAL_FORMAT_EXT, &fmt);
//	glGetRenderbufferParameterivEXT(GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_WIDTH_EXT, (GLint *)&w);
//	glGetRenderbufferParameterivEXT(GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_HEIGHT_EXT, (GLint *)&h);

    switch(error)
	{
		case GL_FRAMEBUFFER_COMPLETE_EXT:
			break;
		case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
			ERROR_LOG("Error! missing a required image/buffer attachment!\n");
			break;
		case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
			ERROR_LOG("Error! has no images/buffers attached!\n");
			break;
//      case GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
//          ERROR_LOG("Error! has an image/buffer attached in multiple locations!\n");
//           break;
		case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
			ERROR_LOG("Error! has mismatched image/buffer dimensions!\n");
			break;
		case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
			ERROR_LOG("Error! colorbuffer attachments have different types!\n");
			break;
		case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
			ERROR_LOG("Error! trying to draw to non-attached color buffer!\n");
			break;
		case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
			ERROR_LOG("Error! trying to read from a non-attached color buffer!\n");
			break;
		case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
			ERROR_LOG("Error! format is not supported by current graphics card/driver!\n");
			break;
		default:
			ERROR_LOG("*UNKNOWN ERROR* reported from glCheckFramebufferStatusEXT()!\n");
			break;
	}
}

void HandleCgError(CGcontext ctx, CGerror err, void* appdata)
{
    if (s_bOutputCgErrors)
	{
        ERROR_LOG("Cg error: %s\n", cgGetErrorString(err));
        const char* listing = cgGetLastListing(g_cgcontext);
        if (listing != NULL) {
            ERROR_LOG("    last listing: %s\n", listing);
        }
    //    glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &loc);
    //    printf("pos: %d\n", loc);
    }
}

//////////////////////////////////////////////////////////////////////////////////////
// Called from VertexShaderManager
// ----------------------
void UpdateViewport()
{
	// -----------------------------------------------------------------------
	// Logging
	// ------------------
    // reversed gxsetviewport(xorig, yorig, width, height, nearz, farz)
    // [0] = width/2
    // [1] = height/2
    // [2] = 16777215 * (farz - nearz)
    // [3] = xorig + width/2 + 342
    // [4] = yorig + height/2 + 342
    // [5] = 16777215 * farz

	/*INFO_LOG("view: topleft=(%f,%f), wh=(%f,%f), z=(%f,%f)\n",
		rawViewport[3]-rawViewport[0]-342, rawViewport[4]+rawViewport[1]-342,
		2 * rawViewport[0], 2 * rawViewport[1],
		(rawViewport[5] - rawViewport[2]) / 16777215.0f, rawViewport[5] / 16777215.0f);*/
	// --------------------------


	// -----------------------------------------------------------------------
	// GLViewPort variables
	// ------------------
	int GLWidth, GLHeight, GLx, GLy;
	float FloatGLWidth = fabs(2 * xfregs.rawViewport[0]);
	float FloatGLHeight = fabs(2 * xfregs.rawViewport[1]);

	// rawViewport[0] = 320, rawViewport[1] = -240
	int scissorXOff = bpmem.scissorOffset.x * 2 - 342;
	int scissorYOff = bpmem.scissorOffset.y * 2 - 342;

	// Used in the XFB supplement and the keep aspect ratio function
	int XOffset = 0, YOffset = 0;
	// -------------------------------------


	// -----------------------------------------------------------------------
	/* XFB supplement, fix the black borders problem. This has to be used together with the adjustment
	   of glScissor in Renderer::SetScissorRect() */
	// ------------------

	/* I'm limiting it to the stretch to fit option because I don't know how the other mode works. The reason
	   I don't allow this option together with UseXFB is that they are supplements and the XFB function
	   should be able to produce the same result */
	//if(g_Config.bStretchToFit && !g_Config.bUseXFB)
	if(false)
	{
		XOffset = (640 - GLScissorW);
		YOffset = (480 - GLScissorH);
		FloatGLWidth = FloatGLWidth - XOffset;
		FloatGLHeight = FloatGLHeight - YOffset;
	}
	// ------------------------


	// -----------------------------------------------------------------------
	// Keep aspect ratio at 4:3
	//		Output: GLWidth, GLHeight, XOffset, YOffset
	// ------------------

	// Internal functions
	float FourThree = 4.0f / 3.0f;
	float wAdj, hAdj;
	float actualRatiow, actualRatioh;
	int overfl;
	int actualWid, actualHei;
	// The rendering window width and height
	int WinW = OpenGL_GetWidth();
	int WinH = OpenGL_GetHeight();
	// The rendering window aspect ratio
	float Ratio = (float)WinW / (float)WinH / FourThree;

	// The XOffset and YOffset values are currently only used in the Stretch To Fit option
	if (g_Config.bKeepAR && g_Config.bStretchToFit)
	{
		// Check if height or width is the limiting factor. If ratio > 1 the picture is to wide and have to limit the width.
		if (Ratio > 1)
		{
			wAdj = Ratio;
			hAdj = 1;

			GLWidth = (int)ceil(FloatGLWidth / wAdj);
			GLHeight = (int)ceil(FloatGLHeight / hAdj);

			actualWid = (int)ceil((float)WinW / Ratio);
			// The picture compared to the screen
			actualRatiow = (float)actualWid / (float)GLWidth;
			overfl = (int)ceil((WinW - actualWid) / actualRatiow);
			XOffset = XOffset + overfl / 2;
		}
		// The window is to high, we have to limit the height
		else
		{
			// Invert the ratio
			Ratio = 1 / Ratio;

			wAdj = 1;
			hAdj = Ratio;

			GLWidth = (int)ceil(FloatGLWidth / wAdj);
			GLHeight = (int)ceil(FloatGLHeight / hAdj);

			actualHei = (int)ceil((float)WinH / Ratio);
			// The picture compared to the screen
			actualRatioh = (float)actualHei / (float)GLHeight;
			overfl = (int)ceil((WinH - actualHei) / actualRatioh);
			YOffset = YOffset + overfl / 2;
		}
	}
	// Don't adjust the position of screen size
	else
	{
		// Round up to the nearest integer
		GLWidth = (int)ceil(FloatGLWidth);
		GLHeight = (int)ceil(FloatGLHeight);
	}
	// -------------------------------------


	// -----------------------------------------------------------------------
	// Stretch picture while keeping the native resolution
	// ------------------
	if (g_Config.bStretchToFit)
	{
		GLx = (int)(xfregs.rawViewport[3] - xfregs.rawViewport[0] - 342 - scissorXOff) + XOffset;
		GLy = Renderer::GetTargetHeight() - ((int)(xfregs.rawViewport[4] - xfregs.rawViewport[1] - 342 - scissorYOff)) + YOffset;
	}
	// -----------------------------------------------------------------------
	// Stretch picture with increased internal resolution
	// ------------------
	else
	{
	    float MValueX = OpenGL_GetXmax();
	    float MValueY = OpenGL_GetYmax();

		GLx = (int)ceil((xfregs.rawViewport[3] - xfregs.rawViewport[0] - 342 - scissorXOff) * MValueX);
		GLy = (int)ceil(Renderer::GetTargetHeight() - ((int)(xfregs.rawViewport[4] - xfregs.rawViewport[1] - 342 - scissorYOff)) * MValueY);
		GLWidth = (int)ceil(abs((int)(2 * xfregs.rawViewport[0])) * MValueX);
		GLHeight = (int)ceil(abs((int)(2 * xfregs.rawViewport[1])) * MValueY);
	}
	// -------------------------------------


	// Update the view port
	glViewport(
		GLx, GLy,
		GLWidth, GLHeight
		);


	// -----------------------------------------------------------------------
	// GLDepthRange
	// ------------------
	double GLNear = (xfregs.rawViewport[5] - xfregs.rawViewport[2]) / 16777215.0f;
	double GLFar = xfregs.rawViewport[5] / 16777215.0f;
	glDepthRange(GLNear, GLFar);
	// -------------------------------------
	

	// Logging
	/*
	RECT RcTop, RcParent, RcChild;
	HWND Child = EmuWindow::GetWnd();
	HWND Parent = GetParent(Child);
	HWND Top = GetParent(Parent);
	GetWindowRect(Top, &RcTop);
	GetWindowRect(Parent, &RcParent);
	GetWindowRect(Child, &RcChild);

	
	//Console::ClearScreen();	
	Console::Print("----------------------------------------------------------------\n");
	Console::Print("Top window:     X:%03i Y:%03i Width:%03i Height:%03i\n", RcTop.left, RcTop.top, RcTop.right - RcTop.left, RcTop.bottom - RcTop.top);
	Console::Print("Parent window:  X:%03i Y:%03i Width:%03i Height:%03i\n", RcParent.left, RcParent.top, RcParent.right - RcParent.left, RcParent.bottom - RcParent.top);
	Console::Print("Child window:   X:%03i Y:%03i Width:%03i Height:%03i\n", RcChild.left, RcChild.top, RcChild.right - RcChild.left, RcChild.bottom - RcChild.top);
	Console::Print("----------------------------------------------------------------\n");
	Console::Print("Res. MValue:    X:%f Y:%f XOffs:%f YOffs:%f\n", OpenGL_GetXmax(), OpenGL_GetYmax(), OpenGL_GetXoff(), OpenGL_GetYoff());
	Console::Print("GLViewPort:     X:%03i Y:%03i Width:%03i Height:%03i\n", GLx, GLy, GLWidth, GLHeight);
	Console::Print("GLDepthRange:   Near:%f Far:%f\n", GLNear, GLFar);
	Console::Print("GLScissor:      X:%03i Y:%03i Width:%03i Height:%03i\n", GLScissorX, GLScissorY, GLScissorW, GLScissorH);
	Console::Print("----------------------------------------------------------------\n");
	*/
}