#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <time.h>

#include <png.h>

#include <SDL.h>
#define GL_GLEXT_PROTOTYPES
#include <SDL_opengl.h>

#ifndef min
#define min(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef max
#define max(a,b) ((a) > (b) ? (a) : (b))
#endif
#define timeGetTime() time(NULL)

#include "../main/winlnxdefs.h"

#include "glN64.h"
#include "OpenGL.h"
#include "Types.h"
#include "N64.h"
#include "gSP.h"
#include "gDP.h"
#include "Textures.h"
#include "Combiner.h"
#include "VI.h"

#ifndef GL_BGR
#define GL_BGR GL_BGR_EXT
#endif

GLInfo OGL;

#ifndef __LINUX__
// NV_register_combiners functions
PFNGLCOMBINERPARAMETERFVNVPROC glCombinerParameterfvNV;
PFNGLCOMBINERPARAMETERFNVPROC glCombinerParameterfNV;
PFNGLCOMBINERPARAMETERIVNVPROC glCombinerParameterivNV;
PFNGLCOMBINERPARAMETERINVPROC glCombinerParameteriNV;
PFNGLCOMBINERINPUTNVPROC glCombinerInputNV;
PFNGLCOMBINEROUTPUTNVPROC glCombinerOutputNV;
PFNGLFINALCOMBINERINPUTNVPROC glFinalCombinerInputNV;
PFNGLGETCOMBINERINPUTPARAMETERFVNVPROC glGetCombinerInputParameterfvNV;
PFNGLGETCOMBINERINPUTPARAMETERIVNVPROC glGetCombinerInputParameterivNV;
PFNGLGETCOMBINEROUTPUTPARAMETERFVNVPROC glGetCombinerOutputParameterfvNV;
PFNGLGETCOMBINEROUTPUTPARAMETERIVNVPROC glGetCombinerOutputParameterivNV;
PFNGLGETFINALCOMBINERINPUTPARAMETERFVNVPROC glGetFinalCombinerInputParameterfvNV;
PFNGLGETFINALCOMBINERINPUTPARAMETERIVNVPROC glGetFinalCombinerInputParameterivNV;

// ARB_multitexture functions
PFNGLACTIVETEXTUREARBPROC glActiveTextureARB;
PFNGLCLIENTACTIVETEXTUREARBPROC glClientActiveTextureARB;
PFNGLMULTITEXCOORD2FARBPROC glMultiTexCoord2fARB;

// EXT_fog_coord functions
PFNGLFOGCOORDFEXTPROC glFogCoordfEXT;
PFNGLFOGCOORDFVEXTPROC glFogCoordfvEXT;
PFNGLFOGCOORDDEXTPROC glFogCoorddEXT;
PFNGLFOGCOORDDVEXTPROC glFogCoorddvEXT;
PFNGLFOGCOORDPOINTEREXTPROC glFogCoordPointerEXT;

// EXT_secondary_color functions
PFNGLSECONDARYCOLOR3BEXTPROC glSecondaryColor3bEXT;
PFNGLSECONDARYCOLOR3BVEXTPROC glSecondaryColor3bvEXT;
PFNGLSECONDARYCOLOR3DEXTPROC glSecondaryColor3dEXT;
PFNGLSECONDARYCOLOR3DVEXTPROC glSecondaryColor3dvEXT;
PFNGLSECONDARYCOLOR3FEXTPROC glSecondaryColor3fEXT;
PFNGLSECONDARYCOLOR3FVEXTPROC glSecondaryColor3fvEXT;
PFNGLSECONDARYCOLOR3IEXTPROC glSecondaryColor3iEXT;
PFNGLSECONDARYCOLOR3IVEXTPROC glSecondaryColor3ivEXT;
PFNGLSECONDARYCOLOR3SEXTPROC glSecondaryColor3sEXT;
PFNGLSECONDARYCOLOR3SVEXTPROC glSecondaryColor3svEXT;
PFNGLSECONDARYCOLOR3UBEXTPROC glSecondaryColor3ubEXT;
PFNGLSECONDARYCOLOR3UBVEXTPROC glSecondaryColor3ubvEXT;
PFNGLSECONDARYCOLOR3UIEXTPROC glSecondaryColor3uiEXT;
PFNGLSECONDARYCOLOR3UIVEXTPROC glSecondaryColor3uivEXT;
PFNGLSECONDARYCOLOR3USEXTPROC glSecondaryColor3usEXT;
PFNGLSECONDARYCOLOR3USVEXTPROC glSecondaryColor3usvEXT;
PFNGLSECONDARYCOLORPOINTEREXTPROC glSecondaryColorPointerEXT;
#endif // !__LINUX__

BOOL isExtensionSupported( const char *extension )
{
    const GLubyte *extensions = NULL;
    const GLubyte *start;
    GLubyte *where, *terminator;

    where = (GLubyte *) strchr(extension, ' ');
    if (where || *extension == '\0')
        return 0;

    extensions = glGetString(GL_EXTENSIONS);

    start = extensions;
    for (;;)
    {
        where = (GLubyte *) strstr((const char *) start, extension);
        if (!where)
            break;

        terminator = where + strlen(extension);
        if (where == start || *(where - 1) == ' ')
            if (*terminator == ' ' || *terminator == '\0')
                return TRUE;

        start = terminator;
    }

    return FALSE;
}

void OGL_InitExtensions()
{
    if ((OGL.NV_register_combiners = isExtensionSupported( "GL_NV_register_combiners" )))
    {
#ifndef __LINUX__
        glCombinerParameterfvNV = (PFNGLCOMBINERPARAMETERFVNVPROC)wglGetProcAddress( "glCombinerParameterfvNV" );
        glCombinerParameterfNV = (PFNGLCOMBINERPARAMETERFNVPROC)wglGetProcAddress( "glCombinerParameterfNV" );
        glCombinerParameterivNV = (PFNGLCOMBINERPARAMETERIVNVPROC)wglGetProcAddress( "glCombinerParameterivNV" );
        glCombinerParameteriNV = (PFNGLCOMBINERPARAMETERINVPROC)wglGetProcAddress( "glCombinerParameteriNV" );
        glCombinerInputNV = (PFNGLCOMBINERINPUTNVPROC)wglGetProcAddress( "glCombinerInputNV" );
        glCombinerOutputNV = (PFNGLCOMBINEROUTPUTNVPROC)wglGetProcAddress( "glCombinerOutputNV" );
        glFinalCombinerInputNV = (PFNGLFINALCOMBINERINPUTNVPROC)wglGetProcAddress( "glFinalCombinerInputNV" );
        glGetCombinerInputParameterfvNV = (PFNGLGETCOMBINERINPUTPARAMETERFVNVPROC)wglGetProcAddress( "glGetCombinerInputParameterfvNV" );
        glGetCombinerInputParameterivNV = (PFNGLGETCOMBINERINPUTPARAMETERIVNVPROC)wglGetProcAddress( "glGetCombinerInputParameterivNV" );
        glGetCombinerOutputParameterfvNV = (PFNGLGETCOMBINEROUTPUTPARAMETERFVNVPROC)wglGetProcAddress( "glGetCombinerOutputParameterfvNV" );
        glGetCombinerOutputParameterivNV = (PFNGLGETCOMBINEROUTPUTPARAMETERIVNVPROC)wglGetProcAddress( "glGetCombinerOutputParameterivNV" );
        glGetFinalCombinerInputParameterfvNV = (PFNGLGETFINALCOMBINERINPUTPARAMETERFVNVPROC)wglGetProcAddress( "glGetFinalCombinerInputParameterfvNV" );
        glGetFinalCombinerInputParameterivNV = (PFNGLGETFINALCOMBINERINPUTPARAMETERIVNVPROC)wglGetProcAddress( "glGetFinalCombinerInputParameterivNV" );
#endif // !__LINUX__
        glGetIntegerv( GL_MAX_GENERAL_COMBINERS_NV, &OGL.maxGeneralCombiners );
    }

    if ((OGL.ARB_multitexture = isExtensionSupported( "GL_ARB_multitexture" )))
    {
#ifndef __LINUX__
        glActiveTextureARB          = (PFNGLACTIVETEXTUREARBPROC)wglGetProcAddress( "glActiveTextureARB" );
        glClientActiveTextureARB    = (PFNGLCLIENTACTIVETEXTUREARBPROC)wglGetProcAddress( "glClientActiveTextureARB" );
        glMultiTexCoord2fARB        = (PFNGLMULTITEXCOORD2FARBPROC)wglGetProcAddress( "glMultiTexCoord2fARB" );
#endif // !__LINUX__

        glGetIntegerv( GL_MAX_TEXTURE_UNITS_ARB, &OGL.maxTextureUnits );
        OGL.maxTextureUnits = min( 8, OGL.maxTextureUnits ); // The plugin only supports 8, and 4 is really enough
    }

    if ((OGL.EXT_fog_coord = isExtensionSupported( "GL_EXT_fog_coord" )))
    {
#ifndef __LINUX__
        glFogCoordfEXT = (PFNGLFOGCOORDFEXTPROC)wglGetProcAddress( "glFogCoordfEXT" );
        glFogCoordfvEXT = (PFNGLFOGCOORDFVEXTPROC)wglGetProcAddress( "glFogCoordfvEXT" );
        glFogCoorddEXT = (PFNGLFOGCOORDDEXTPROC)wglGetProcAddress( "glFogCoorddEXT" );
        glFogCoorddvEXT = (PFNGLFOGCOORDDVEXTPROC)wglGetProcAddress( "glFogCoorddvEXT" );
        glFogCoordPointerEXT = (PFNGLFOGCOORDPOINTEREXTPROC)wglGetProcAddress( "glFogCoordPointerEXT" );
#endif // !__LINUX__
    }

    if ((OGL.EXT_secondary_color = isExtensionSupported( "GL_EXT_secondary_color" )))
    {
#ifndef __LINUX__
        glSecondaryColor3bEXT = (PFNGLSECONDARYCOLOR3BEXTPROC)wglGetProcAddress( "glSecondaryColor3bEXT" );
        glSecondaryColor3bvEXT = (PFNGLSECONDARYCOLOR3BVEXTPROC)wglGetProcAddress( "glSecondaryColor3bvEXT" );
        glSecondaryColor3dEXT = (PFNGLSECONDARYCOLOR3DEXTPROC)wglGetProcAddress( "glSecondaryColor3dEXT" );
        glSecondaryColor3dvEXT = (PFNGLSECONDARYCOLOR3DVEXTPROC)wglGetProcAddress( "glSecondaryColor3dvEXT" );
        glSecondaryColor3fEXT = (PFNGLSECONDARYCOLOR3FEXTPROC)wglGetProcAddress( "glSecondaryColor3fEXT" );
        glSecondaryColor3fvEXT = (PFNGLSECONDARYCOLOR3FVEXTPROC)wglGetProcAddress( "glSecondaryColor3fvEXT" );
        glSecondaryColor3iEXT = (PFNGLSECONDARYCOLOR3IEXTPROC)wglGetProcAddress( "glSecondaryColor3iEXT" );
        glSecondaryColor3ivEXT = (PFNGLSECONDARYCOLOR3IVEXTPROC)wglGetProcAddress( "glSecondaryColor3ivEXT" );
        glSecondaryColor3sEXT = (PFNGLSECONDARYCOLOR3SEXTPROC)wglGetProcAddress( "glSecondaryColor3sEXT" );
        glSecondaryColor3svEXT = (PFNGLSECONDARYCOLOR3SVEXTPROC)wglGetProcAddress( "glSecondaryColor3svEXT" );
        glSecondaryColor3ubEXT = (PFNGLSECONDARYCOLOR3UBEXTPROC)wglGetProcAddress( "glSecondaryColor3ubEXT" );
        glSecondaryColor3ubvEXT = (PFNGLSECONDARYCOLOR3UBVEXTPROC)wglGetProcAddress( "glSecondaryColor3ubvEXT" );
        glSecondaryColor3uiEXT = (PFNGLSECONDARYCOLOR3UIEXTPROC)wglGetProcAddress( "glSecondaryColor3uiEXT" );
        glSecondaryColor3uivEXT = (PFNGLSECONDARYCOLOR3UIVEXTPROC)wglGetProcAddress( "glSecondaryColor3uivEXT" );
        glSecondaryColor3usEXT = (PFNGLSECONDARYCOLOR3USEXTPROC)wglGetProcAddress( "glSecondaryColor3usEXT" );
        glSecondaryColor3usvEXT = (PFNGLSECONDARYCOLOR3USVEXTPROC)wglGetProcAddress( "glSecondaryColor3usvEXT" );
        glSecondaryColorPointerEXT = (PFNGLSECONDARYCOLORPOINTEREXTPROC)wglGetProcAddress( "glSecondaryColorPointerEXT" );
#endif // !__LINUX__
    }

    OGL.ARB_texture_env_combine = isExtensionSupported( "GL_ARB_texture_env_combine" );
    OGL.ARB_texture_env_crossbar = isExtensionSupported( "GL_ARB_texture_env_crossbar" );
    OGL.EXT_texture_env_combine = isExtensionSupported( "GL_EXT_texture_env_combine" );
    OGL.ATI_texture_env_combine3 = isExtensionSupported( "GL_ATI_texture_env_combine3" );
    OGL.ATIX_texture_env_route = isExtensionSupported( "GL_ATIX_texture_env_route" );
    OGL.NV_texture_env_combine4 = isExtensionSupported( "GL_NV_texture_env_combine4" );;
}

void OGL_InitStates()
{
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();

    glVertexPointer( 4, GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].x );
    glEnableClientState( GL_VERTEX_ARRAY );

    glColorPointer( 4, GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].color.r );
    glEnableClientState( GL_COLOR_ARRAY );

    if (OGL.EXT_secondary_color)
    {
        glSecondaryColorPointerEXT( 3, GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].secondaryColor.r );
        glEnableClientState( GL_SECONDARY_COLOR_ARRAY_EXT );
    }

    if (OGL.ARB_multitexture)
    {
        glClientActiveTextureARB( GL_TEXTURE0_ARB );
        glTexCoordPointer( 2, GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].s0 );
        glEnableClientState( GL_TEXTURE_COORD_ARRAY );

        glClientActiveTextureARB( GL_TEXTURE1_ARB );
        glTexCoordPointer( 2, GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].s1 );
        glEnableClientState( GL_TEXTURE_COORD_ARRAY );
    }
    else
    {
        glTexCoordPointer( 2, GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].s0 );
        glEnableClientState( GL_TEXTURE_COORD_ARRAY );
    }

    if (OGL.EXT_fog_coord)
    {
        glFogi( GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT );

        glFogi( GL_FOG_MODE, GL_LINEAR );
        glFogf( GL_FOG_START, 0.0f );
        glFogf( GL_FOG_END, 255.0f );

        glFogCoordPointerEXT( GL_FLOAT, sizeof( GLVertex ), &OGL.vertices[0].fog );
        glEnableClientState( GL_FOG_COORDINATE_ARRAY_EXT );
    }

    glPolygonOffset( -3.0f, -3.0f );

    glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
    glClear( GL_COLOR_BUFFER_BIT );

    srand( timeGetTime() );

    for (int i = 0; i < 32; i++)
    {
        for (int j = 0; j < 8; j++)
            for (int k = 0; k < 128; k++)
                OGL.stipplePattern[i][j][k] =((i > (rand() >> 10)) << 7) |
                                            ((i > (rand() >> 10)) << 6) |
                                            ((i > (rand() >> 10)) << 5) |
                                            ((i > (rand() >> 10)) << 4) |
                                            ((i > (rand() >> 10)) << 3) |
                                            ((i > (rand() >> 10)) << 2) |
                                            ((i > (rand() >> 10)) << 1) |
                                            ((i > (rand() >> 10)) << 0);
    }

#ifndef __LINUX__
    SwapBuffers( wglGetCurrentDC() );
#else
    OGL_SwapBuffers();
#endif
}

void OGL_UpdateScale()
{
    OGL.scaleX = (float)OGL.width / (float)VI.width;
    OGL.scaleY = (float)OGL.height / (float)VI.height;
}

void OGL_ResizeWindow()
{
#ifndef __LINUX__
    RECT    windowRect, statusRect, toolRect;

    if (OGL.fullscreen)
    {
        OGL.width = OGL.fullscreenWidth;
        OGL.height = OGL.fullscreenHeight;
        OGL.heightOffset = 0;

        SetWindowPos( hWnd, NULL, 0, 0, OGL.width, OGL.height, SWP_NOACTIVATE | SWP_NOZORDER | SWP_SHOWWINDOW );
    }
    else
    {
        OGL.width = OGL.windowedWidth;
        OGL.height = OGL.windowedHeight;

        GetClientRect( hWnd, &windowRect );
        GetWindowRect( hStatusBar, &statusRect );

        if (hToolBar)
            GetWindowRect( hToolBar, &toolRect );
        else
            toolRect.bottom = toolRect.top = 0;

        OGL.heightOffset = (statusRect.bottom - statusRect.top);
        windowRect.right = windowRect.left + OGL.windowedWidth - 1;
        windowRect.bottom = windowRect.top + OGL.windowedHeight - 1 + OGL.heightOffset;

        AdjustWindowRect( &windowRect, GetWindowLong( hWnd, GWL_STYLE ), GetMenu( hWnd ) != NULL );

        SetWindowPos( hWnd, NULL, 0, 0, windowRect.right - windowRect.left + 1,
                        windowRect.bottom - windowRect.top + 1 + toolRect.bottom - toolRect.top + 1, SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE );
    }
#else // !__LINUX__
#endif // __LINUX__
}

bool OGL_Start()
{
#ifndef __LINUX__
    int     pixelFormat;

    PIXELFORMATDESCRIPTOR pfd = {
        sizeof(PIXELFORMATDESCRIPTOR),    // size of this pfd
        1,                                // version number
        PFD_DRAW_TO_WINDOW |              // support window
        PFD_SUPPORT_OPENGL |              // support OpenGL
        PFD_DOUBLEBUFFER,                 // double buffered
        PFD_TYPE_RGBA,                    // RGBA type
        32,                               // color depth
        0, 0, 0, 0, 0, 0,                 // color bits ignored
        0,                                // no alpha buffer
        0,                                // shift bit ignored
        0,                                // no accumulation buffer
        0, 0, 0, 0,                       // accum bits ignored
        32,                               // z-buffer
        0,                                // no stencil buffer
        0,                                // no auxiliary buffer
        PFD_MAIN_PLANE,                   // main layer
        0,                                // reserved
        0, 0, 0                           // layer masks ignored
    };

    if ((OGL.hDC = GetDC( hWnd )) == NULL)
    {
        MessageBox( hWnd, "Error while getting a device context!", pluginName, MB_ICONERROR | MB_OK );
        return FALSE;
    }

    if ((pixelFormat = ChoosePixelFormat( OGL.hDC, &pfd )) == 0)
    {
        MessageBox( hWnd, "Unable to find a suitable pixel format!", pluginName, MB_ICONERROR | MB_OK );
        OGL_Stop();
        return FALSE;
    }

    if ((SetPixelFormat( OGL.hDC, pixelFormat, &pfd )) == FALSE)
    {
        MessageBox( hWnd, "Error while setting pixel format!", pluginName, MB_ICONERROR | MB_OK );
        OGL_Stop();
        return FALSE;
    }

    if ((OGL.hRC = wglCreateContext( OGL.hDC )) == NULL)
    {
        MessageBox( hWnd, "Error while creating OpenGL context!", pluginName, MB_ICONERROR | MB_OK );
        OGL_Stop();
        return FALSE;
    }

    if ((wglMakeCurrent( OGL.hDC, OGL.hRC )) == FALSE)
    {
        MessageBox( hWnd, "Error while making OpenGL context current!", pluginName, MB_ICONERROR | MB_OK );
        OGL_Stop();
        return FALSE;
    }
#else // !__LINUX__
    // init sdl & gl
    const SDL_VideoInfo *videoInfo;
    Uint32 videoFlags = 0;

    if (OGL.fullscreen)
    {
        OGL.width = OGL.fullscreenWidth;
        OGL.height = OGL.fullscreenHeight;
    }
    else
    {
        OGL.width = OGL.windowedWidth;
        OGL.height = OGL.windowedHeight;
    }


    /* Initialize SDL */
    printf( "[glN64]: (II) Initializing SDL video subsystem...\n" );
    if (SDL_InitSubSystem( SDL_INIT_VIDEO ) == -1)
    {
        printf( "[glN64]: (EE) Error initializing SDL video subsystem: %s\n", SDL_GetError() );
        return FALSE;
    }

    /* Video Info */
    printf( "[glN64]: (II) Getting video info...\n" );
    if (!(videoInfo = SDL_GetVideoInfo()))
    {
        printf( "[glN64]: (EE) Video query failed: %s\n", SDL_GetError() );
        SDL_QuitSubSystem( SDL_INIT_VIDEO );
        return FALSE;
    }

    /* Set the video mode */
    videoFlags |= SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_HWPALETTE;

    if (videoInfo->hw_available)
        videoFlags |= SDL_HWSURFACE;
    else
        videoFlags |= SDL_SWSURFACE;

    if (videoInfo->blit_hw)
        videoFlags |= SDL_HWACCEL;

    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
/*  SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );*/
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );   // 32 bit z-buffer
#if !defined(SDL_PRE_1_2_11)
    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1);   // only swap buffers on vertical sync
#endif

    printf( "[glN64]: (II) Setting video mode %dx%d...\n", (int)OGL.width, (int)OGL.height );
    if (!(OGL.hScreen = SDL_SetVideoMode( OGL.width, OGL.height, 0, videoFlags )))
    {
        printf( "[glN64]: (EE) Error setting videomode %dx%d: %s\n", (int)OGL.width, (int)OGL.height, SDL_GetError() );
        SDL_QuitSubSystem( SDL_INIT_VIDEO );
        return FALSE;
    }

    SDL_WM_SetCaption( pluginName, pluginName );
#endif // __LINUX__

    OGL_InitExtensions();
    OGL_InitStates();

    TextureCache_Init();
    FrameBuffer_Init();
    Combiner_Init();

    gSP.changed = gDP.changed = 0xFFFFFFFF;
    OGL_UpdateScale();

    return TRUE;
}

void OGL_Stop()
{
    Combiner_Destroy();
    FrameBuffer_Destroy();
    TextureCache_Destroy();

#ifndef __LINUX__
    wglMakeCurrent( NULL, NULL );

    if (OGL.hRC)
    {
        wglDeleteContext( OGL.hRC );
        OGL.hRC = NULL;
    }

    if (OGL.hDC)
    {
        ReleaseDC( hWnd, OGL.hDC );
        OGL.hDC = NULL;
    }
#else // !__LINUX__
    SDL_QuitSubSystem( SDL_INIT_VIDEO );
    OGL.hScreen = NULL;
#endif // __LINUX__
}

void OGL_UpdateCullFace()
{
    if (gSP.geometryMode & G_CULL_BOTH)
    {
        glEnable( GL_CULL_FACE );

        if (gSP.geometryMode & G_CULL_BACK)
            glCullFace( GL_BACK );
        else
            glCullFace( GL_FRONT );
    }
    else
        glDisable( GL_CULL_FACE );
}

void OGL_UpdateViewport()
{
    glViewport( (int)(gSP.viewport.x * OGL.scaleX), (int)((VI.height - (gSP.viewport.y + gSP.viewport.height)) * OGL.scaleY + OGL.heightOffset),
                (int)(gSP.viewport.width * OGL.scaleX), (int)(gSP.viewport.height * OGL.scaleY) );
    glDepthRange( 0.0f, 1.0f );//gSP.viewport.nearz, gSP.viewport.farz );
}

void OGL_UpdateDepthUpdate()
{
    if (gDP.otherMode.depthUpdate)
        glDepthMask( TRUE );
    else
        glDepthMask( FALSE );
}

void OGL_UpdateStates()
{
    if (gSP.changed & CHANGED_GEOMETRYMODE)
    {
        OGL_UpdateCullFace();

        if ((gSP.geometryMode & G_FOG) && OGL.EXT_fog_coord && OGL.fog)
            glEnable( GL_FOG );
        else
            glDisable( GL_FOG );

        gSP.changed &= ~CHANGED_GEOMETRYMODE;
    }

    if (gSP.geometryMode & G_ZBUFFER)
        glEnable( GL_DEPTH_TEST );
    else
        glDisable( GL_DEPTH_TEST );

    if (gDP.changed & CHANGED_RENDERMODE)
    {
        if (gDP.otherMode.depthCompare)
            glDepthFunc( GL_LEQUAL );
        else
            glDepthFunc( GL_ALWAYS );

        OGL_UpdateDepthUpdate();

        if (gDP.otherMode.depthMode == ZMODE_DEC)
            glEnable( GL_POLYGON_OFFSET_FILL );
        else
        {
//          glPolygonOffset( -3.0f, -3.0f );
            glDisable( GL_POLYGON_OFFSET_FILL );
        }
    }

    if ((gDP.changed & CHANGED_ALPHACOMPARE) || (gDP.changed & CHANGED_RENDERMODE))
    {
        // Enable alpha test for threshold mode
        if ((gDP.otherMode.alphaCompare == G_AC_THRESHOLD) && !(gDP.otherMode.alphaCvgSel))
        {
            glEnable( GL_ALPHA_TEST );

            glAlphaFunc( (gDP.blendColor.a > 0.0f) ? GL_GEQUAL : GL_GREATER, gDP.blendColor.a );
        }
        // Used in TEX_EDGE and similar render modes
        else if (gDP.otherMode.cvgXAlpha)
        {
            glEnable( GL_ALPHA_TEST );

            // Arbitrary number -- gives nice results though
            glAlphaFunc( GL_GEQUAL, 0.5f );
        }
        else
            glDisable( GL_ALPHA_TEST );

        if (OGL.usePolygonStipple && (gDP.otherMode.alphaCompare == G_AC_DITHER) && !(gDP.otherMode.alphaCvgSel))
            glEnable( GL_POLYGON_STIPPLE );
        else
            glDisable( GL_POLYGON_STIPPLE );
    }

    if (gDP.changed & CHANGED_SCISSOR)
    {
        glScissor( (int)(gDP.scissor.ulx * OGL.scaleX), (int)((VI.height - gDP.scissor.lry) * OGL.scaleY + OGL.heightOffset),
            (int)((gDP.scissor.lrx - gDP.scissor.ulx) * OGL.scaleX), (int)((gDP.scissor.lry - gDP.scissor.uly) * OGL.scaleY) );
    }

    if (gSP.changed & CHANGED_VIEWPORT)
    {
        OGL_UpdateViewport();
    }

    if ((gDP.changed & CHANGED_COMBINE) || (gDP.changed & CHANGED_CYCLETYPE))
    {
        if (gDP.otherMode.cycleType == G_CYC_COPY)
            Combiner_SetCombine( EncodeCombineMode( 0, 0, 0, TEXEL0, 0, 0, 0, TEXEL0, 0, 0, 0, TEXEL0, 0, 0, 0, TEXEL0 ) );
        else if (gDP.otherMode.cycleType == G_CYC_FILL)
            Combiner_SetCombine( EncodeCombineMode( 0, 0, 0, SHADE, 0, 0, 0, 1, 0, 0, 0, SHADE, 0, 0, 0, 1 ) );
        else
            Combiner_SetCombine( gDP.combine.mux );
    }

    if (gDP.changed & CHANGED_COMBINE_COLORS)
    {
        Combiner_UpdateCombineColors();
    }

    if ((gSP.changed & CHANGED_TEXTURE) || (gDP.changed & CHANGED_TILE) || (gDP.changed & CHANGED_TMEM))
    {
        Combiner_BeginTextureUpdate();

        if (combiner.usesT0)
        {
            TextureCache_Update( 0 );

            gSP.changed &= ~CHANGED_TEXTURE;
            gDP.changed &= ~CHANGED_TILE;
            gDP.changed &= ~CHANGED_TMEM;
        }
        else
        {
            TextureCache_ActivateDummy( 0 );
        }

        if (combiner.usesT1)
        {
            TextureCache_Update( 1 );

            gSP.changed &= ~CHANGED_TEXTURE;
            gDP.changed &= ~CHANGED_TILE;
            gDP.changed &= ~CHANGED_TMEM;
        }
        else
        {
            TextureCache_ActivateDummy( 1 );
        }

        Combiner_EndTextureUpdate();
    }

    if ((gDP.changed & CHANGED_FOGCOLOR) && OGL.fog)
        glFogfv( GL_FOG_COLOR, &gDP.fogColor.r );

    if ((gDP.changed & CHANGED_RENDERMODE) || (gDP.changed & CHANGED_CYCLETYPE))
    {
        if ((gDP.otherMode.forceBlender) &&
            (gDP.otherMode.cycleType != G_CYC_COPY) &&
            (gDP.otherMode.cycleType != G_CYC_FILL) &&
            !(gDP.otherMode.alphaCvgSel))
        {
            glEnable( GL_BLEND );

            switch (gDP.otherMode.l >> 16)
            {
                case 0x0448: // Add
                case 0x055A:
                    glBlendFunc( GL_ONE, GL_ONE );
                    break;
                case 0x0C08: // 1080 Sky
                case 0x0F0A: // Used LOTS of places
                    glBlendFunc( GL_ONE, GL_ZERO );
                    break;
                case 0xC810: // Blends fog
                case 0xC811: // Blends fog
                case 0x0C18: // Standard interpolated blend
                case 0x0C19: // Used for antialiasing
                case 0x0050: // Standard interpolated blend
                case 0x0055: // Used for antialiasing
                    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
                    break;
                case 0x0FA5: // Seems to be doing just blend color - maybe combiner can be used for this?
                case 0x5055: // Used in Paper Mario intro, I'm not sure if this is right...
                    glBlendFunc( GL_ZERO, GL_ONE );
                    break;
                default:
                    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
                    break;
            }
        }
        else
            glDisable( GL_BLEND );

        if (gDP.otherMode.cycleType == G_CYC_FILL)
        {
            glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
            glEnable( GL_BLEND );
        }
    }

    gDP.changed &= CHANGED_TILE | CHANGED_TMEM;
    gSP.changed &= CHANGED_TEXTURE | CHANGED_MATRIX;
}

void OGL_AddTriangle( SPVertex *vertices, int v0, int v1, int v2 )
{
    int v[] = { v0, v1, v2 };

    if (gSP.changed || gDP.changed)
        OGL_UpdateStates();

//  Playing around with lod fraction junk...
//  float ds = max( max( fabs( vertices[v0].s - vertices[v1].s ), fabs( vertices[v0].s - vertices[v2].s ) ), fabs( vertices[v1].s - vertices[v2].s ) ) * cache.current[0]->shiftScaleS * gSP.texture.scales;
//  float dx = max( max( fabs( vertices[v0].x / vertices[v0].w - vertices[v1].x / vertices[v1].w ), fabs( vertices[v0].x / vertices[v0].w - vertices[v2].x / vertices[v2].w ) ), fabs( vertices[v1].x / vertices[v1].w - vertices[v2].x / vertices[v2].w ) ) * gSP.viewport.vscale[0];
//  float lod = ds / dx;
//  float lod_fraction = min( 1.0f, max( 0.0f, lod - 1.0f ) / max( 1.0f, gSP.texture.level ) );


    for (int i = 0; i < 3; i++)
    {
        OGL.vertices[OGL.numVertices].x = vertices[v[i]].x;
        OGL.vertices[OGL.numVertices].y = vertices[v[i]].y;
        OGL.vertices[OGL.numVertices].z = gDP.otherMode.depthSource == G_ZS_PRIM ? gDP.primDepth.z * vertices[v[i]].w : vertices[v[i]].z;
        OGL.vertices[OGL.numVertices].w = vertices[v[i]].w;

        OGL.vertices[OGL.numVertices].color.r = vertices[v[i]].r;
        OGL.vertices[OGL.numVertices].color.g = vertices[v[i]].g;
        OGL.vertices[OGL.numVertices].color.b = vertices[v[i]].b;
        OGL.vertices[OGL.numVertices].color.a = vertices[v[i]].a;
        SetConstant( OGL.vertices[OGL.numVertices].color, combiner.vertex.color, combiner.vertex.alpha );
        //SetConstant( OGL.vertices[OGL.numVertices].secondaryColor, combiner.vertex.secondaryColor, ONE );

        if (OGL.EXT_secondary_color)
        {
            OGL.vertices[OGL.numVertices].secondaryColor.r = 0.0f;//lod_fraction; //vertices[v[i]].r;
            OGL.vertices[OGL.numVertices].secondaryColor.g = 0.0f;//lod_fraction; //vertices[v[i]].g;
            OGL.vertices[OGL.numVertices].secondaryColor.b = 0.0f;//lod_fraction; //vertices[v[i]].b;
            OGL.vertices[OGL.numVertices].secondaryColor.a = 1.0f;
            SetConstant( OGL.vertices[OGL.numVertices].secondaryColor, combiner.vertex.secondaryColor, ONE );
        }

        if ((gSP.geometryMode & G_FOG) && OGL.EXT_fog_coord && OGL.fog)
        {
            if (vertices[v[i]].z < -vertices[v[i]].w)
                OGL.vertices[OGL.numVertices].fog = max( 0.0f, -(float)gSP.fog.multiplier + (float)gSP.fog.offset );
            else
                OGL.vertices[OGL.numVertices].fog = max( 0.0f, vertices[v[i]].z / vertices[v[i]].w * (float)gSP.fog.multiplier + (float)gSP.fog.offset );
        }

        if (combiner.usesT0)
        {
            if (cache.current[0]->frameBufferTexture)
            {
/*              OGL.vertices[OGL.numVertices].s0 = (cache.current[0]->offsetS + (vertices[v[i]].s * cache.current[0]->shiftScaleS * gSP.texture.scales - gSP.textureTile[0]->fuls)) * cache.current[0]->scaleS;
                OGL.vertices[OGL.numVertices].t0 = (cache.current[0]->offsetT - (vertices[v[i]].t * cache.current[0]->shiftScaleT * gSP.texture.scalet - gSP.textureTile[0]->fult)) * cache.current[0]->scaleT;*/

                if (gSP.textureTile[0]->masks)
                    OGL.vertices[OGL.numVertices].s0 = (cache.current[0]->offsetS + (vertices[v[i]].s * cache.current[0]->shiftScaleS * gSP.texture.scales - fmod( gSP.textureTile[0]->fuls, 1 << gSP.textureTile[0]->masks ))) * cache.current[0]->scaleS;
                else
                    OGL.vertices[OGL.numVertices].s0 = (cache.current[0]->offsetS + (vertices[v[i]].s * cache.current[0]->shiftScaleS * gSP.texture.scales - gSP.textureTile[0]->fuls)) * cache.current[0]->scaleS;

                if (gSP.textureTile[0]->maskt)
                    OGL.vertices[OGL.numVertices].t0 = (cache.current[0]->offsetT - (vertices[v[i]].t * cache.current[0]->shiftScaleT * gSP.texture.scalet - fmod( gSP.textureTile[0]->fult, 1 << gSP.textureTile[0]->maskt ))) * cache.current[0]->scaleT;
                else
                    OGL.vertices[OGL.numVertices].t0 = (cache.current[0]->offsetT - (vertices[v[i]].t * cache.current[0]->shiftScaleT * gSP.texture.scalet - gSP.textureTile[0]->fult)) * cache.current[0]->scaleT;
            }
            else
            {
                OGL.vertices[OGL.numVertices].s0 = (vertices[v[i]].s * cache.current[0]->shiftScaleS * gSP.texture.scales - gSP.textureTile[0]->fuls + cache.current[0]->offsetS) * cache.current[0]->scaleS; 
                OGL.vertices[OGL.numVertices].t0 = (vertices[v[i]].t * cache.current[0]->shiftScaleT * gSP.texture.scalet - gSP.textureTile[0]->fult + cache.current[0]->offsetT) * cache.current[0]->scaleT;
            }
        }

        if (combiner.usesT1)
        {
            if (cache.current[0]->frameBufferTexture)
            {
                OGL.vertices[OGL.numVertices].s1 = (cache.current[1]->offsetS + (vertices[v[i]].s * cache.current[1]->shiftScaleS * gSP.texture.scales - gSP.textureTile[1]->fuls)) * cache.current[1]->scaleS;
                OGL.vertices[OGL.numVertices].t1 = (cache.current[1]->offsetT - (vertices[v[i]].t * cache.current[1]->shiftScaleT * gSP.texture.scalet - gSP.textureTile[1]->fult)) * cache.current[1]->scaleT;
            }
            else
            {
                OGL.vertices[OGL.numVertices].s1 = (vertices[v[i]].s * cache.current[1]->shiftScaleS * gSP.texture.scales - gSP.textureTile[1]->fuls + cache.current[1]->offsetS) * cache.current[1]->scaleS; 
                OGL.vertices[OGL.numVertices].t1 = (vertices[v[i]].t * cache.current[1]->shiftScaleT * gSP.texture.scalet - gSP.textureTile[1]->fult + cache.current[1]->offsetT) * cache.current[1]->scaleT;
            }
        }
        OGL.numVertices++;
    }
    OGL.numTriangles++;

    if (OGL.numVertices >= 255)
        OGL_DrawTriangles();
}

void OGL_DrawTriangles()
{
    if (OGL.usePolygonStipple && (gDP.otherMode.alphaCompare == G_AC_DITHER) && !(gDP.otherMode.alphaCvgSel))
    {
        OGL.lastStipple = (OGL.lastStipple + 1) & 0x7;
        glPolygonStipple( OGL.stipplePattern[(BYTE)(gDP.envColor.a * 255.0f) >> 3][OGL.lastStipple] );
    }

    glDrawArrays( GL_TRIANGLES, 0, OGL.numVertices );
    OGL.numTriangles = OGL.numVertices = 0;
}

void OGL_DrawLine( SPVertex *vertices, int v0, int v1, float width )
{
    int v[] = { v0, v1 };

    GLcolor color;

    if (gSP.changed || gDP.changed)
        OGL_UpdateStates();

    glLineWidth( width * OGL.scaleX );

    glBegin( GL_LINES );
        for (int i = 0; i < 2; i++)
        {
            color.r = vertices[v[i]].r;
            color.g = vertices[v[i]].g;
            color.b = vertices[v[i]].b;
            color.a = vertices[v[i]].a;
            SetConstant( color, combiner.vertex.color, combiner.vertex.alpha );
            glColor4fv( &color.r );

            if (OGL.EXT_secondary_color)
            {
                color.r = vertices[v[i]].r;
                color.g = vertices[v[i]].g;
                color.b = vertices[v[i]].b;
                color.a = vertices[v[i]].a;
                SetConstant( color, combiner.vertex.secondaryColor, combiner.vertex.alpha );
                glSecondaryColor3fvEXT( &color.r );
            }

            glVertex4f( vertices[v[i]].x, vertices[v[i]].y, vertices[v[i]].z, vertices[v[i]].w );
        }
    glEnd();
}

void OGL_DrawRect( int ulx, int uly, int lrx, int lry, float *color )
{
    OGL_UpdateStates();

    glDisable( GL_SCISSOR_TEST );
    glDisable( GL_CULL_FACE );
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    glOrtho( 0, VI.width, VI.height, 0, 1.0f, -1.0f );
    glViewport( 0, OGL.heightOffset, OGL.width, OGL.height );
    glDepthRange( 0.0f, 1.0f );

    glColor4f( color[0], color[1], color[2], color[3] );

    glBegin( GL_QUADS );
        glVertex4f( ulx, uly, (gDP.otherMode.depthSource == G_ZS_PRIM) ? gDP.primDepth.z : gSP.viewport.nearz, 1.0f );
        glVertex4f( lrx, uly, (gDP.otherMode.depthSource == G_ZS_PRIM) ? gDP.primDepth.z : gSP.viewport.nearz, 1.0f );
        glVertex4f( lrx, lry, (gDP.otherMode.depthSource == G_ZS_PRIM) ? gDP.primDepth.z : gSP.viewport.nearz, 1.0f );
        glVertex4f( ulx, lry, (gDP.otherMode.depthSource == G_ZS_PRIM) ? gDP.primDepth.z : gSP.viewport.nearz, 1.0f );
    glEnd();

    glLoadIdentity();
    OGL_UpdateCullFace();
    OGL_UpdateViewport();
    glEnable( GL_SCISSOR_TEST );
}

void OGL_DrawTexturedRect( float ulx, float uly, float lrx, float lry, float uls, float ult, float lrs, float lrt, bool flip )
{
    GLVertex rect[2] =
    {
        { ulx, uly, gDP.otherMode.depthSource == G_ZS_PRIM ? gDP.primDepth.z : gSP.viewport.nearz, 1.0f, { /*gDP.blendColor.r, gDP.blendColor.g, gDP.blendColor.b, gDP.blendColor.a */1.0f, 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, uls, ult, uls, ult, 0.0f },
        { lrx, lry, gDP.otherMode.depthSource == G_ZS_PRIM ? gDP.primDepth.z : gSP.viewport.nearz, 1.0f, { /*gDP.blendColor.r, gDP.blendColor.g, gDP.blendColor.b, gDP.blendColor.a*/1.0f, 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, lrs, lrt, lrs, lrt, 0.0f },
    };

    OGL_UpdateStates();

    glDisable( GL_CULL_FACE );
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    glOrtho( 0, VI.width, VI.height, 0, 1.0f, -1.0f );
    glViewport( 0, OGL.heightOffset, OGL.width, OGL.height );

    if (combiner.usesT0)
    {
        rect[0].s0 = rect[0].s0 * cache.current[0]->shiftScaleS - gSP.textureTile[0]->fuls;
        rect[0].t0 = rect[0].t0 * cache.current[0]->shiftScaleT - gSP.textureTile[0]->fult;
        rect[1].s0 = (rect[1].s0 + 1.0f) * cache.current[0]->shiftScaleS - gSP.textureTile[0]->fuls;
        rect[1].t0 = (rect[1].t0 + 1.0f) * cache.current[0]->shiftScaleT - gSP.textureTile[0]->fult;

        if ((cache.current[0]->maskS) && (fmod( rect[0].s0, cache.current[0]->width ) == 0.0f) && !(cache.current[0]->mirrorS))
        {
            rect[1].s0 -= rect[0].s0;
            rect[0].s0 = 0.0f;
        }

        if ((cache.current[0]->maskT) && (fmod( rect[0].t0, cache.current[0]->height ) == 0.0f) && !(cache.current[0]->mirrorT))
        {
            rect[1].t0 -= rect[0].t0;
            rect[0].t0 = 0.0f;
        }

        if (cache.current[0]->frameBufferTexture)
        {
            rect[0].s0 = cache.current[0]->offsetS + rect[0].s0;
            rect[0].t0 = cache.current[0]->offsetT - rect[0].t0;
            rect[1].s0 = cache.current[0]->offsetS + rect[1].s0;
            rect[1].t0 = cache.current[0]->offsetT - rect[1].t0;
        }

        if (OGL.ARB_multitexture)
            glActiveTextureARB( GL_TEXTURE0_ARB );

        if ((rect[0].s0 >= 0.0f) && (rect[1].s0 <= cache.current[0]->width))
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
        //glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
        //glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );

        if ((rect[0].t0 >= 0.0f) && (rect[1].t0 <= cache.current[0]->height))
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );

//      GLint height;

//      glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height );

        rect[0].s0 *= cache.current[0]->scaleS;
        rect[0].t0 *= cache.current[0]->scaleT;
        rect[1].s0 *= cache.current[0]->scaleS;
        rect[1].t0 *= cache.current[0]->scaleT;
    }

    if (combiner.usesT1 && OGL.ARB_multitexture)
    {
        rect[0].s1 = rect[0].s1 * cache.current[1]->shiftScaleS - gSP.textureTile[1]->fuls;
        rect[0].t1 = rect[0].t1 * cache.current[1]->shiftScaleT - gSP.textureTile[1]->fult;
        rect[1].s1 = (rect[1].s1 + 1.0f) * cache.current[1]->shiftScaleS - gSP.textureTile[1]->fuls;
        rect[1].t1 = (rect[1].t1 + 1.0f) * cache.current[1]->shiftScaleT - gSP.textureTile[1]->fult;

        if ((cache.current[1]->maskS) && (fmod( rect[0].s1, cache.current[1]->width ) == 0.0f) && !(cache.current[1]->mirrorS))
        {
            rect[1].s1 -= rect[0].s1;
            rect[0].s1 = 0.0f;
        }

        if ((cache.current[1]->maskT) && (fmod( rect[0].t1, cache.current[1]->height ) == 0.0f) && !(cache.current[1]->mirrorT))
        {
            rect[1].t1 -= rect[0].t1;
            rect[0].t1 = 0.0f;
        }

        if (cache.current[1]->frameBufferTexture)
        {
            rect[0].s1 = cache.current[1]->offsetS + rect[0].s1;
            rect[0].t1 = cache.current[1]->offsetT - rect[0].t1;
            rect[1].s1 = cache.current[1]->offsetS + rect[1].s1;
            rect[1].t1 = cache.current[1]->offsetT - rect[1].t1;
        }

        glActiveTextureARB( GL_TEXTURE1_ARB );

        if ((rect[0].s1 == 0.0f) && (rect[1].s1 <= cache.current[1]->width))
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );

        if ((rect[0].t1 == 0.0f) && (rect[1].t1 <= cache.current[1]->height))
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );

        rect[0].s1 *= cache.current[1]->scaleS;
        rect[0].t1 *= cache.current[1]->scaleT;
        rect[1].s1 *= cache.current[1]->scaleS;
        rect[1].t1 *= cache.current[1]->scaleT;
    }

    if ((gDP.otherMode.cycleType == G_CYC_COPY) && !OGL.forceBilinear)
    {
        if (OGL.ARB_multitexture)
            glActiveTextureARB( GL_TEXTURE0_ARB );

        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
    }

    SetConstant( rect[0].color, combiner.vertex.color, combiner.vertex.alpha );

    if (OGL.EXT_secondary_color)
        SetConstant( rect[0].secondaryColor, combiner.vertex.secondaryColor, combiner.vertex.alpha );

    glBegin( GL_QUADS );
        glColor4f( rect[0].color.r, rect[0].color.g, rect[0].color.b, rect[0].color.a );
        if (OGL.EXT_secondary_color)
            glSecondaryColor3fEXT( rect[0].secondaryColor.r, rect[0].secondaryColor.g, rect[0].secondaryColor.b );

        if (OGL.ARB_multitexture)
        {
            glMultiTexCoord2fARB( GL_TEXTURE0_ARB, rect[0].s0, rect[0].t0 );
            glMultiTexCoord2fARB( GL_TEXTURE1_ARB, rect[0].s1, rect[0].t1 );
            glVertex4f( rect[0].x, rect[0].y, rect[0].z, 1.0f );

            glMultiTexCoord2fARB( GL_TEXTURE0_ARB, rect[1].s0, rect[0].t0 );
            glMultiTexCoord2fARB( GL_TEXTURE1_ARB, rect[1].s1, rect[0].t1 );
            glVertex4f( rect[1].x, rect[0].y, rect[0].z, 1.0f );

            glMultiTexCoord2fARB( GL_TEXTURE0_ARB, rect[1].s0, rect[1].t0 );
            glMultiTexCoord2fARB( GL_TEXTURE1_ARB, rect[1].s1, rect[1].t1 );
            glVertex4f( rect[1].x, rect[1].y, rect[0].z, 1.0f );

            glMultiTexCoord2fARB( GL_TEXTURE0_ARB, rect[0].s0, rect[1].t0 );
            glMultiTexCoord2fARB( GL_TEXTURE1_ARB, rect[0].s1, rect[1].t1 );
            glVertex4f( rect[0].x, rect[1].y, rect[0].z, 1.0f );
        }
        else
        {
            glTexCoord2f( rect[0].s0, rect[0].t0 );
            glVertex4f( rect[0].x, rect[0].y, rect[0].z, 1.0f );

            if (flip)
                glTexCoord2f( rect[1].s0, rect[0].t0 );
            else
                glTexCoord2f( rect[0].s0, rect[1].t0 );

            glVertex4f( rect[1].x, rect[0].y, rect[0].z, 1.0f );

            glTexCoord2f( rect[1].s0, rect[1].t0 );
            glVertex4f( rect[1].x, rect[1].y, rect[0].z, 1.0f );

            if (flip)
                glTexCoord2f( rect[1].s0, rect[0].t0 );
            else
                glTexCoord2f( rect[1].s0, rect[0].t0 );
            glVertex4f( rect[0].x, rect[1].y, rect[0].z, 1.0f );
        }
    glEnd();

    glLoadIdentity();
    OGL_UpdateCullFace();
    OGL_UpdateViewport();
}

void OGL_ClearDepthBuffer()
{
    glDisable( GL_SCISSOR_TEST );

    OGL_UpdateStates();
    glDepthMask( TRUE );
    glClear( GL_DEPTH_BUFFER_BIT );

    OGL_UpdateDepthUpdate();

    glEnable( GL_SCISSOR_TEST );
}

void OGL_ClearColorBuffer( float *color )
{
    glDisable( GL_SCISSOR_TEST );

    glClearColor( color[0], color[1], color[2], color[3] );
    glClear( GL_COLOR_BUFFER_BIT );

    glEnable( GL_SCISSOR_TEST );
}


static void OGL_png_error(png_structp png_write, const char *message)
{
    printf("PNG Error: %s\n", message);
}

static void OGL_png_warn(png_structp png_write, const char *message)
{
    printf("PNG Warning: %s\n", message);
}

void OGL_SaveScreenshot()
{
#ifndef __LINUX__
    BITMAPFILEHEADER fileHeader;
    BITMAPINFOHEADER infoHeader;
    HANDLE hBitmapFile;

    char *pixelData = (char*)malloc( OGL.width * OGL.height * 3 );

    glReadBuffer( GL_FRONT );
    glReadPixels( 0, OGL.heightOffset, OGL.width, OGL.height, GL_BGR_EXT, GL_UNSIGNED_BYTE, pixelData );
    glReadBuffer( GL_BACK );

    infoHeader.biSize = sizeof( BITMAPINFOHEADER );
    infoHeader.biWidth = OGL.width;
    infoHeader.biHeight = OGL.height;
    infoHeader.biPlanes = 1;
    infoHeader.biBitCount = 24;
    infoHeader.biCompression = BI_RGB;
    infoHeader.biSizeImage = OGL.width * OGL.height * 3;
    infoHeader.biXPelsPerMeter = 0;
    infoHeader.biYPelsPerMeter = 0;
    infoHeader.biClrUsed = 0;
    infoHeader.biClrImportant = 0;

    fileHeader.bfType = 19778;
    fileHeader.bfSize = sizeof( BITMAPFILEHEADER ) + sizeof( BITMAPINFOHEADER ) + infoHeader.biSizeImage;
    fileHeader.bfReserved1 = fileHeader.bfReserved2 = 0;
    fileHeader.bfOffBits = sizeof( BITMAPFILEHEADER ) + sizeof( BITMAPINFOHEADER );

    char filename[256];

    CreateDirectory( screenDirectory, NULL );

    int i = 0;
    do
    {
        sprintf( filename, "%sscreen%02i.bmp", screenDirectory, i );
        i++;

        if (i > 99)
            return;

        hBitmapFile = CreateFile( filename, GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL );
    }
    while (hBitmapFile == INVALID_HANDLE_VALUE);
    
    DWORD written;

    WriteFile( hBitmapFile, &fileHeader, sizeof( BITMAPFILEHEADER ), &written, NULL );
    WriteFile( hBitmapFile, &infoHeader, sizeof( BITMAPINFOHEADER ), &written, NULL );
    WriteFile( hBitmapFile, pixelData, infoHeader.biSizeImage, &written, NULL );

    CloseHandle( hBitmapFile );
    free( pixelData );
#else // !__LINUX__
    // start by getting the base file path
    char filepath[2048], filename[2048];
    filepath[0] = 0;
    filename[0] = 0;
    strcpy(filepath, screenDirectory);
    if (strlen(filepath) > 0 && filepath[strlen(filepath)-1] != '/')
        strcat(filepath, "/");
    strcat(filepath, "mupen64");
    // look for a file
    int i;
    for (i = 0; i < 100; i++)
    {
        sprintf(filename, "%s_%03i.png", filepath, i);
        FILE *pFile = fopen(filename, "r");
        if (pFile == NULL)
            break;
        fclose(pFile);
    }
    if (i == 100) return;
    // allocate PNG structures
    png_structp png_write = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, OGL_png_error, OGL_png_warn);
    if (!png_write)
    {
        printf("Error creating PNG write struct.\n");
        return;
    }
    png_infop png_info = png_create_info_struct(png_write);
    if (!png_info)
    {
        png_destroy_write_struct(&png_write, (png_infopp)NULL);
        printf("Error creating PNG info struct.\n");
        return;
    }
    // Set the jumpback
    if (setjmp(png_jmpbuf(png_write)))
    {
        png_destroy_write_struct(&png_write, &png_info);
        printf("Error calling setjmp()\n");
        return;
    }
    // open the file to write
    FILE *savefile = fopen(filename, "wb");
    if (savefile == NULL)
    {
        printf("Error opening '%s' to save screenshot.\n", filename);
        return;
    }
    // give the file handle to the PNG compressor
    png_init_io(png_write, savefile);
    // read pixel data from OpenGL
    char *pixels = (char*)malloc( OGL.width * OGL.height * 3 );
    glReadBuffer( GL_FRONT );
    glReadPixels( 0, OGL.heightOffset, OGL.width, OGL.height, GL_RGB, GL_UNSIGNED_BYTE, pixels );
    glReadBuffer( GL_BACK );
    // set the info
    int width = OGL.width;
    int height = OGL.height;
    png_set_IHDR(png_write, png_info, width, height, 8, PNG_COLOR_TYPE_RGB,
                 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
    // lock the screen, get a pointer and row pitch
    long pitch = width * 3;
    // allocate row pointers and scale each row to 24-bit color
    png_byte **row_pointers;
    row_pointers = (png_byte **) malloc(height * sizeof(png_bytep));
    for (int i = 0; i < height; i++)
    {
        row_pointers[i] = (png_byte *) (pixels + (height - 1 - i) * pitch);
    }
    // set the row pointers
    png_set_rows(png_write, png_info, row_pointers);
    // write the picture to disk
    png_write_png(png_write, png_info, 0, NULL);
    // free memory
    free(row_pointers);
    png_destroy_write_struct(&png_write, &png_info);
    free(pixels);
    // all done
#endif // __LINUX__
}

#ifdef __LINUX__
void
OGL_SwapBuffers()
{
    static int frames[5] = { 0, 0, 0, 0, 0 };
    static int framesIndex = 0;
    static Uint32 lastTicks = 0;
    Uint32 ticks = SDL_GetTicks();

    frames[framesIndex]++;
    if (ticks >= (lastTicks + 1000))
    {
        char caption[500];
        float fps = 0.0;
        for (int i = 0; i < 5; i++)
            fps += frames[i];
        fps /= 5.0;
        snprintf( caption, 500, "%s - %.2f fps", pluginName, fps );
        SDL_WM_SetCaption( caption, pluginName );
        framesIndex = (framesIndex + 1) % 5;
        frames[framesIndex] = 0;
        lastTicks = ticks;
    }

    // if emulator defined a render callback function, call it before buffer swap

    if(renderCallback)
        (*renderCallback)();

    SDL_GL_SwapBuffers();
}

void OGL_ReadScreen( void **dest, int *width, int *height )
{
    *width = OGL.width;
    *height = OGL.height;

    *dest = malloc( OGL.height * OGL.width * 3 );
    if (*dest == 0)
        return;

    GLint oldMode;
    glGetIntegerv( GL_READ_BUFFER, &oldMode );
    glReadBuffer( GL_FRONT );
//  glReadBuffer( GL_BACK );
    glReadPixels( 0, 0, OGL.width, OGL.height,
                  GL_RGB, GL_UNSIGNED_BYTE, *dest );
    glReadBuffer( oldMode );
}

#endif // __LINUX__