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 "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 "VertexShader.h"
#include "PixelShaderCache.h"
#include "PixelShaderManager.h"
#include "VertexLoaderManager.h"
#include "VertexLoader.h"
#include "XFB.h"
#include "Timer.h"
#include "Logging/Logging.h" // for Logging()

#if defined(HAVE_WX) && HAVE_WX
#include "Debugger/Debugger.h" // for the CDebugger class
#endif

#ifdef _WIN32
#include "OS/Win32.h"
#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;

#if defined(HAVE_WX) && HAVE_WX
extern CDebugger* m_frame; // the debugging class
#endif

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_bBlendLogicOp = false;
int frameCount;

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

bool Renderer::Init()
{
    bool bSuccess = true;
    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;

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

    if (strstr(ptoken, "GL_EXT_blend_logic_op") != NULL)
        g_bBlendLogicOp = true;
    if (strstr(ptoken, "ATI_draw_buffers") != NULL  && strstr(ptoken, "ARB_draw_buffers") == NULL)
        //Checks if it ONLY has the ATI_draw_buffers extension, some have both
        s_bATIDrawBuffers = true;

    s_bFullscreen = g_Config.bFullscreen;

    if (glewInit() != GLEW_OK) {
        ERROR_LOG("glewInit() failed!\n");
        return false;
    }

    if (!GLEW_EXT_framebuffer_object) {
        ERROR_LOG("*********\nGPU: ERROR: Need GL_EXT_framebufer_object for multiple render targets\nGPU: *********\n");
        bSuccess = false;
    }
    
    if (!GLEW_EXT_secondary_color) {
        ERROR_LOG("*********\nGPU: OGL ERROR: Need GL_EXT_secondary_color\nGPU: *********\n");
        bSuccess = false;
    }

    int numvertexattribs=0;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, (GLint *)&numvertexattribs);

    if (numvertexattribs < 11) {
        ERROR_LOG("*********\nGPU: OGL ERROR: Number of attributes %d not enough\nGPU: *********\n", 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)\n");
#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\n");
    }

    _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);
    // 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);

    //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]);
    __Log("max program env parameters: vert=%d, frag=%d\n", nenvvertparams, nenvfragparams);
    __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);
    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);
}

void Renderer::ReinitView(int nNewWidth, int nNewHeight)
{
    int oldscreen = s_bFullscreen;

	OpenGL_Shutdown();
	int oldwidth = (int)OpenGL_GetWidth(), 
	    oldheight = (int)OpenGL_GetHeight();
    if (!OpenGL_Create(g_VideoInitialize, nNewWidth, nNewHeight)) {//nNewWidth&~7, nNewHeight&~7)) {
        ERROR_LOG("Failed to recreate, reverting to old settings\n");
        if (!OpenGL_Create(g_VideoInitialize, oldwidth, oldheight)) {
            g_VideoInitialize.pSysMessage("Failed to revert, exiting...\n");
			// TODO - don't takedown the entire emu
            exit(0);
        }
    }
	OpenGL_MakeCurrent();

    if (oldscreen && !g_Config.bFullscreen) { // if transitioning from full screen
#ifdef _WIN32
        RECT rc;
        rc.left = 0; rc.top = 0;
        rc.right = nNewWidth; rc.bottom = nNewHeight;
        AdjustWindowRect(&rc, EmuWindow::g_winstyle, FALSE);

        RECT rcdesktop;
        GetWindowRect(GetDesktopWindow(), &rcdesktop);

        SetWindowLong(EmuWindow::GetWnd(), GWL_STYLE, EmuWindow::g_winstyle);
        SetWindowPos(EmuWindow::GetWnd(), HWND_TOP, ((rcdesktop.right-rcdesktop.left)-(rc.right-rc.left))/2,
            ((rcdesktop.bottom-rcdesktop.top)-(rc.bottom-rc.top))/2,
            rc.right-rc.left, rc.bottom-rc.top, SWP_SHOWWINDOW);
        UpdateWindow(EmuWindow::GetWnd());
#else // linux
#endif
    }

    OpenGL_SetSize(nNewWidth > 16 ? nNewWidth : 16,
		   nNewHeight > 16 ? nNewHeight : 16);
}

int Renderer::GetTargetWidth()
{
    return (g_Config.bStretchToFit ? 640 : (int)OpenGL_GetWidth());
}

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

bool Renderer::CanBlendLogicOp()
{
	return g_bBlendLogicOp;
}

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.blendmode.blendenable) glEnable(GL_BLEND);
    if (bpmem.zmode.updateenable) glDepthMask(GL_TRUE);

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

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);
}

// 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
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 = bpmem.scissorTL.x - xoff - 342; // left = 0
	rc_left *= MValueX;
	if (rc_left < 0) rc_left = 0;

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

	float rc_bottom = bpmem.scissorBR.y - yoff - 342; // 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
		);*/

    if (rc_right >= rc_left && rc_bottom >= rc_top)
	{
        glScissor(
			(int)rc_left, // x = 0
			Renderer::GetTargetHeight() - (int)(rc_bottom), // y = 0
			(int)(rc_right-rc_left), // y = 0
			(int)(rc_bottom-rc_top) // y = 0
			); 
        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
	// 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();

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

	// Write logging data to debugger
#if defined(HAVE_WX) && HAVE_WX
	if (m_frame)
		Logging(0);
#endif	
    if (g_Config.bOverlayStats) {
        char st[2048];
        char *p = st;
        if (g_Config.bShowFPS)
            p+=sprintf(p, "FPS: %d\n", s_fps); // So it shows up before the stats and doesn't make anyting ugly
        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 text = st;
		VertexLoaderManager::AppendListToString(&text);
	
		Renderer::RenderText(text.c_str(), 20, 20, 0xFF00FFFF);
    }
    else
    {
        if (g_Config.bShowFPS)
        {
            char strfps[25];
            sprintf(strfps, "%d\n", s_fps);
            Renderer::RenderText(strfps, 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 from 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;

//	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()
{
    // 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);*/

	// Keep aspect ratio at 4:3
	// rawViewport[0] = 320, rawViewport[1] = -240
	int scissorXOff = bpmem.scissorOffset.x * 2 - 342;
	int scissorYOff = bpmem.scissorOffset.y * 2 - 342;
	float fourThree = 4.0f / 3.0f;
	float wAdj, hAdj;
	float actualRatiow, actualRatioh;
	int overfl;
	int xoffs = 0, yoffs = 0;
	int wid, hei, actualWid, actualHei;

	int winw = OpenGL_GetWidth();
	int winh = OpenGL_GetHeight();
	float ratio = (float)winw / (float)winh / fourThree;
	if (g_Config.bKeepAR)
	{
		// Check if height or width is the limiting factor
		if (ratio > 1) // then we are to wide and have to limit the width
		{
			wAdj = ratio;
			hAdj = 1;

			wid = ceil(fabs(2 * xfregs.rawViewport[0]) / wAdj);
			hei = ceil(fabs(2 * xfregs.rawViewport[1]) / hAdj);

			actualWid = ceil((float)winw / ratio);
			actualRatiow = (float)actualWid / (float)wid; // the picture versus the screen
			overfl = (winw - actualWid) / actualRatiow;
			xoffs = overfl / 2;
		}
		else // the window is to high, we have to limit the height
		{
			ratio = 1 / ratio;

			wAdj = 1;
			hAdj = ratio;

			wid = ceil(fabs(2 * xfregs.rawViewport[0]) / wAdj);
			hei = ceil(fabs(2 * xfregs.rawViewport[1]) / hAdj);

			actualHei = ceil((float)winh / ratio);
			actualRatioh = (float)actualHei / (float)hei; // the picture versus the screen
			overfl = (winh - actualHei) / actualRatioh;
			yoffs = overfl / 2;
		}
	}
	else
	{
		wid = ceil(fabs(2 * xfregs.rawViewport[0]));
		hei = ceil(fabs(2 * xfregs.rawViewport[1]));
	}

	if (g_Config.bStretchToFit)
	{
		glViewport(
			(int)(xfregs.rawViewport[3]-xfregs.rawViewport[0]-342-scissorXOff) + xoffs,
			Renderer::GetTargetHeight() - ((int)(xfregs.rawViewport[4]-xfregs.rawViewport[1]-342-scissorYOff)) + yoffs,
			wid, // width
			hei // height
			);
	}
	else
	{
	    float MValueX = OpenGL_GetXmax();
	    float MValueY = OpenGL_GetYmax();
	    glViewport((int)(xfregs.rawViewport[3]-xfregs.rawViewport[0]-342-scissorXOff) * MValueX,
		       Renderer::GetTargetHeight()-((int)(xfregs.rawViewport[4]-xfregs.rawViewport[1]-342-scissorYOff))  * MValueY,
			abs((int)(2 * xfregs.rawViewport[0])) * MValueX, abs((int)(2 * xfregs.rawViewport[1])) * MValueY);
	}

	glDepthRange((xfregs.rawViewport[5]- xfregs.rawViewport[2])/16777215.0f, xfregs.rawViewport[5]/16777215.0f);
}