snes9x/gtk/src/shaders/CGLCG.cpp

/***********************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002  Gary Henderson (gary.henderson@ntlworld.com),
                             Jerremy Koot (jkoot@snes9x.com)

  (c) Copyright 2002 - 2004  Matthew Kendora

  (c) Copyright 2002 - 2005  Peter Bortas (peter@bortas.org)

  (c) Copyright 2004 - 2005  Joel Yliluoma (http://iki.fi/bisqwit/)

  (c) Copyright 2001 - 2006  John Weidman (jweidman@slip.net)

  (c) Copyright 2002 - 2006  funkyass (funkyass@spam.shaw.ca),
                             Kris Bleakley (codeviolation@hotmail.com)

  (c) Copyright 2002 - 2010  Brad Jorsch (anomie@users.sourceforge.net),
                             Nach (n-a-c-h@users.sourceforge.net),

  (c) Copyright 2002 - 2011  zones (kasumitokoduck@yahoo.com)

  (c) Copyright 2006 - 2007  nitsuja

  (c) Copyright 2009 - 2017  BearOso,
                             OV2

  (c) Copyright 2017         qwertymodo

  (c) Copyright 2011 - 2017  Hans-Kristian Arntzen,
                             Daniel De Matteis
                             (Under no circumstances will commercial rights be
 given)


  BS-X C emulator code
  (c) Copyright 2005 - 2006  Dreamer Nom,
                             zones

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003  _Demo_ (_demo_@zsnes.com),
                             Nach,
                             zsKnight (zsknight@zsnes.com)

  C4 C++ code
  (c) Copyright 2003 - 2006  Brad Jorsch,
                             Nach

  DSP-1 emulator code
  (c) Copyright 1998 - 2006  _Demo_,
                             Andreas Naive (andreasnaive@gmail.com),
                             Gary Henderson,
                             Ivar (ivar@snes9x.com),
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora,
                             Nach,
                             neviksti (neviksti@hotmail.com)

  DSP-2 emulator code
  (c) Copyright 2003         John Weidman,
                             Kris Bleakley,
                             Lord Nightmare
 (lord_nightmare@users.sourceforge.net), Matthew Kendora, neviksti

  DSP-3 emulator code
  (c) Copyright 2003 - 2006  John Weidman,
                             Kris Bleakley,
                             Lancer,
                             z80 gaiden

  DSP-4 emulator code
  (c) Copyright 2004 - 2006  Dreamer Nom,
                             John Weidman,
                             Kris Bleakley,
                             Nach,
                             z80 gaiden

  OBC1 emulator code
  (c) Copyright 2001 - 2004  zsKnight,
                             pagefault (pagefault@zsnes.com),
                             Kris Bleakley
                             Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code used in 1.39-1.51
  (c) Copyright 2002         Matthew Kendora with research by
                             zsKnight,
                             John Weidman,
                             Dark Force

  SPC7110 and RTC C++ emulator code used in 1.52+
  (c) Copyright 2009         byuu,
                             neviksti

  S-DD1 C emulator code
  (c) Copyright 2003         Brad Jorsch with research by
                             Andreas Naive,
                             John Weidman

  S-RTC C emulator code
  (c) Copyright 2001 - 2006  byuu,
                             John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003         Feather,
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003  _Demo_,
                             pagefault,
                             zsKnight

  Super FX C emulator code
  (c) Copyright 1997 - 1999  Ivar,
                             Gary Henderson,
                             John Weidman

  Sound emulator code used in 1.5-1.51
  (c) Copyright 1998 - 2003  Brad Martin
  (c) Copyright 1998 - 2006  Charles Bilyue'

  Sound emulator code used in 1.52+
  (c) Copyright 2004 - 2007  Shay Green (gblargg@gmail.com)

  S-SMP emulator code used in 1.54+
  (c) Copyright 2016         byuu

  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004  Marcus Comstedt (marcus@mc.pp.se)

  2xSaI filter
  (c) Copyright 1999 - 2001  Derek Liauw Kie Fa

  HQ2x, HQ3x, HQ4x filters
  (c) Copyright 2003         Maxim Stepin (maxim@hiend3d.com)

  NTSC filter
  (c) Copyright 2006 - 2007  Shay Green

  GTK+ GUI code
  (c) Copyright 2004 - 2017  BearOso

  Win32 GUI code
  (c) Copyright 2003 - 2006  blip,
                             funkyass,
                             Matthew Kendora,
                             Nach,
                             nitsuja
  (c) Copyright 2009 - 2017  OV2

  Mac OS GUI code
  (c) Copyright 1998 - 2001  John Stiles
  (c) Copyright 2001 - 2011  zones

  Libretro port
  (c) Copyright 2011 - 2017  Hans-Kristian Arntzen,
                             Daniel De Matteis
                             (Under no circumstances will commercial rights be
 given)


  Specific ports contains the works of other authors. See headers in
  individual files.


  Snes9x homepage: http://www.snes9x.com/

  Permission to use, copy, modify and/or distribute Snes9x in both binary
  and source form, for non-commercial purposes, is hereby granted without
  fee, providing that this license information and copyright notice appear
  with all copies and any derived work.

  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software or it's derivatives.

  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes,
  but is not limited to, charging money for Snes9x or software derived from
  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
  using Snes9x as a promotion for your commercial product.

  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.

  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
 ***********************************************************************************/
#include "CGLCG.h"
#include "../gtk_s9x.h"
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>

#include "../gtk_display_driver_opengl.h"
#include "shader_helpers.h"

static char* ReadShaderFileContents(const char *filename)
{
    FILE* file = NULL;
    int size;
    char* contents;

    file = fopen(filename, "rb");
    if (!file)
        return NULL;

    fseek(file, 0, SEEK_END);
    size = ftell(file);
    fseek(file, 0, SEEK_SET);

    contents = new char[size + 1];
    fread(contents, size, 1, file);
    contents[size] = '\0';
    fclose(file);

    return contents;
}

static void ReduceToPath(char* filename)
{
    for (int i = strlen(filename); i >= 0; i--)
    {
        if (filename[i] == '\\' || filename[i] == '/')
        {
            filename[i] = 0;
            break;
        }
    }
}

#include <png.h>

#ifndef max
#define max(a, b) (((a) > (b)) ? (a) : (b))
#endif

static float npot(float desired)
{
    float out = 256.0;
    while (out < desired)
        out *= 2;
    return out;
}

const GLfloat CGLCG::lut_coords[8] = { 0, 0, 1, 0, 1, 1, 0, 1 };

CGLCG::CGLCG(CGcontext cgContext)
{
    this->cgContext = cgContext;
    fboFunctionsLoaded = FALSE;
    ClearPasses();
    LoadFBOFunctions();
    frameCnt = 0;
}

CGLCG::~CGLCG(void)
{
    LoadShader(NULL);
}

void CGLCG::ClearPasses()
{
    /* clean up cg programs, fbos and textures from all regular passes
         pass 0 is the orignal texture, so ignore that
      */
    if (shaderPasses.size() > 1)
    {
        for (glPassVector::iterator it = (shaderPasses.begin() + 1);
             it != shaderPasses.end();
             it++)
        {
            if (it->cgFragmentProgram)
                cgDestroyProgram(it->cgFragmentProgram);
            if (it->cgVertexProgram)
                cgDestroyProgram(it->cgVertexProgram);
            if (it->fbo)
                glDeleteFramebuffers(1, &it->fbo);
            if (it->tex)
                glDeleteTextures(1, &it->tex);
        }
    }

    for (glLutVector::iterator it = lookupTextures.begin(); it != lookupTextures.end(); it++)
    {
        if (it->tex)
            glDeleteTextures(1, &it->tex);
    }

    for (glPrevDeque::iterator it = prevPasses.begin(); it != prevPasses.end(); it++)
    {
        if (it->tex)
            glDeleteTextures(1, &it->tex);
    }
    shaderPasses.clear();
    lookupTextures.clear();
    prevPasses.clear();
    // prevPasses deque is always filled with PREV + PREV1-6 elements
    prevPasses.resize(7);

    shaderLoaded = false;
}

bool CGLCG::LoadFBOFunctions()
{
    const char* extensions = (const char*) glGetString(GL_EXTENSIONS);

    if (extensions && strstr(extensions, "framebuffer_object"))
    {
        fboFunctionsLoaded = true;
    }

    return fboFunctionsLoaded;
}

void CGLCG::checkForCgError(const char* situation)
{
    char buffer[4096];
    CGerror error = cgGetError();
    const char* string = cgGetErrorString(error);

    if (error != CG_NO_ERROR)
    {
        sprintf(buffer,
            "Situation: %s\n"
            "Error: %s\n\n"
            "Cg compiler output...\n",
            situation,
            string);
        printf("Cg error: %s\n", buffer);

        if (error == CG_COMPILER_ERROR)
        {
            printf("Cg compilation error: %s\n", cgGetLastListing(cgContext));
        }
    }
}

bool CGLCG::LoadShader(const char* shaderFile)
{
    CCGShader cgShader;
    char shaderPath[PATH_MAX];
    char tempPath[PATH_MAX];
    CGprofile vertexProfile, fragmentProfile;

    if (!fboFunctionsLoaded)
    {
        printf("CG Error: Your OpenGL graphics driver does not support framebuffer "
               "objects.\nYou will not be able to use Cg shaders.\n");
        return false;
    }

    vertexProfile = cgGLGetLatestProfile(CG_GL_VERTEX);
    fragmentProfile = cgGLGetLatestProfile(CG_GL_FRAGMENT);

    cgGLDisableProfile(vertexProfile);
    cgGLDisableProfile(fragmentProfile);

    ClearPasses();

    if (shaderFile == NULL || *shaderFile == '\0')
        return true;

    strcpy(shaderPath, shaderFile);
    ReduceToPath(shaderPath);

    chdir(shaderPath);
    if (!cgShader.LoadShader(shaderFile))
        return false;

    cgGLSetOptimalOptions(vertexProfile);
    cgGLSetOptimalOptions(fragmentProfile);

    /* insert dummy pass that will contain the original texture
   */
    shaderPasses.push_back(shaderPass());

    for (CCGShader::passVector::iterator it = cgShader.shaderPasses.begin();
         it != cgShader.shaderPasses.end();
         it++) {
        shaderPass pass;

        pass.scaleParams = it->scaleParams;
        /* if this is the last pass (the only one that can have CG_SCALE_NONE)
               and no filter has been set use the GUI setting
            */
        if (pass.scaleParams.scaleTypeX == CG_SCALE_NONE && !it->filterSet)
        {
            pass.linearFilter = Settings.BilinearFilter;
        }
        else
        {
            pass.linearFilter = it->linearFilter;
        }

        pass.frameCounterMod = it->frameCounterMod;

        pass.floatFbo = it->floatFbo;

        // paths in the meta file can be relative
        realpath(it->cgShaderFile, tempPath);
        char* fileContents = ReadShaderFileContents(tempPath);
        if (!fileContents)
        {
            printf("Couldn't read file %s\n", tempPath);
            return false;
        }

        // individual shader might include files, these should be relative to shader
        ReduceToPath(tempPath);
        chdir(tempPath);

        pass.cgVertexProgram = cgCreateProgram(
            cgContext, CG_SOURCE, fileContents, vertexProfile, "main_vertex", NULL);

        checkForCgError("Compiling vertex program");

        pass.cgFragmentProgram = cgCreateProgram(cgContext,
            CG_SOURCE,
            fileContents,
            fragmentProfile,
            "main_fragment",
            NULL);

        checkForCgError("Compiling fragment program");

        // set path back for next pass
        chdir(shaderPath);

        delete[] fileContents;
        if (!pass.cgVertexProgram || !pass.cgFragmentProgram) {
            return false;
        }
        cgGLLoadProgram(pass.cgVertexProgram);
        cgGLLoadProgram(pass.cgFragmentProgram);

        /* generate framebuffer and texture for this pass and apply
               default texture settings
            */
        glGenFramebuffers(1, &pass.fbo);
        glGenTextures(1, &pass.tex);
        glBindTexture(GL_TEXTURE_2D, pass.tex);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

        shaderPasses.push_back(pass);
    }

    for (std::vector<CCGShader::lookupTexture>::iterator it = cgShader.lookupTextures.begin();
         it != cgShader.lookupTextures.end();
         it++)
    {
        lookupTexture tex;
        strcpy(tex.id, it->id);

        /* generate texture for the lut and apply specified filter setting
     */
        glGenTextures(1, &tex.tex);
        glBindTexture(GL_TEXTURE_2D, tex.tex);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
        glTexParameteri(GL_TEXTURE_2D,
            GL_TEXTURE_MAG_FILTER,
            it->linearfilter ? GL_LINEAR : GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D,
            GL_TEXTURE_MIN_FILTER,
            it->linearfilter ? GL_LINEAR : GL_NEAREST);

        realpath(it->texturePath, tempPath);

        // simple file extension png/tga decision
        int strLen = strlen(it->texturePath);
        if (strLen > 4)
        {
            if (!strcasecmp(&it->texturePath[strLen - 4], ".png"))
            {
                int width, height;
                bool hasAlpha;
                GLubyte* texData;
                if (loadPngImage(tempPath, width, height, hasAlpha, &texData))
                {
                    glPixelStorei(GL_UNPACK_ROW_LENGTH, width);
                    glTexImage2D(GL_TEXTURE_2D,
                        0,
                        GL_RGBA,
                        width,
                        height,
                        0,
                        hasAlpha ? GL_RGBA : GL_RGB,
                        GL_UNSIGNED_BYTE,
                        texData);
                    free(texData);
                }
            }
            else if (!strcasecmp(&it->texturePath[strLen - 4], ".tga"))
            {
                STGA stga;
                if (loadTGA(tempPath, stga))
                {
                    glPixelStorei(GL_UNPACK_ROW_LENGTH, stga.width);
                    glTexImage2D(GL_TEXTURE_2D,
                        0,
                        GL_RGBA,
                        stga.width,
                        stga.height,
                        0,
                        GL_RGBA,
                        GL_UNSIGNED_BYTE,
                        stga.data);
                }
            }
        }

        lookupTextures.push_back(tex);
    }

    /* enable texture unit 1 for the lookup textures
   */
    glClientActiveTexture(GL_TEXTURE1);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glTexCoordPointer(2, GL_FLOAT, 0, lut_coords);
    glClientActiveTexture(GL_TEXTURE0);

    /* generate textures and set default values for the pref-filled PREV deque.
   */
    for (unsigned int i = 0; i < prevPasses.size(); i++)
    {
        glGenTextures(1, &prevPasses[i].tex);
        glBindTexture(GL_TEXTURE_2D, prevPasses[i].tex);
        glTexImage2D(GL_TEXTURE_2D,
            0,
            GL_RGB,
            512,
            512,
            0,
            GL_RGB,
            GL_UNSIGNED_SHORT_5_6_5,
            NULL);
        glBindTexture(GL_TEXTURE_2D, 0);
        prevPasses[i].textureSize.x = prevPasses[i].textureSize.y = 0;
        memset(prevPasses[i].texCoords, 0, sizeof(prevPasses[i].texCoords));
    }

    shaderLoaded = true;

    return true;
}

void CGLCG::setTexCoords(int pass,
    xySize inputSize,
    xySize textureSize,
    bool topdown)
{
    float tX = inputSize.x / textureSize.x;
    float tY = inputSize.y / textureSize.y;

    // last pass uses top-down coordinates, all others bottom-up
    if (topdown)
    {
        shaderPasses[pass].texcoords[0] = 0.0f;
        shaderPasses[pass].texcoords[1] = tY;
        shaderPasses[pass].texcoords[2] = tX;
        shaderPasses[pass].texcoords[3] = tY;
        shaderPasses[pass].texcoords[4] = tX;
        shaderPasses[pass].texcoords[5] = 0.0f;
        shaderPasses[pass].texcoords[6] = 0.0f;
        shaderPasses[pass].texcoords[7] = 0.0f;
    } else {
        shaderPasses[pass].texcoords[0] = 0.0f;
        shaderPasses[pass].texcoords[1] = 0.0f;
        shaderPasses[pass].texcoords[2] = tX;
        shaderPasses[pass].texcoords[3] = 0.0f;
        shaderPasses[pass].texcoords[4] = tX;
        shaderPasses[pass].texcoords[5] = tY;
        shaderPasses[pass].texcoords[6] = 0.0f;
        shaderPasses[pass].texcoords[7] = tY;
    }

    glTexCoordPointer(2, GL_FLOAT, 0, shaderPasses[pass].texcoords);
}

void CGLCG::Render(GLuint& origTex,
    xySize textureSize,
    xySize inputSize,
    xySize viewportSize)
{
    frameCnt++;
    CGprofile vertexProfile, fragmentProfile;

    if (!shaderLoaded)
        return;

    vertexProfile = cgGLGetLatestProfile(CG_GL_VERTEX);
    fragmentProfile = cgGLGetLatestProfile(CG_GL_FRAGMENT);

    cgGLEnableProfile(vertexProfile);
    cgGLEnableProfile(fragmentProfile);

    /* set up our dummy pass for easier loop code
   */
    shaderPasses[0].tex = origTex;
    shaderPasses[0].outputSize = inputSize;
    shaderPasses[0].textureSize = textureSize;

    /* loop through all real passes
   */
    for (unsigned int i = 1; i < shaderPasses.size(); i++)
    {
        switch (shaderPasses[i].scaleParams.scaleTypeX)
        {
        case CG_SCALE_ABSOLUTE:
            shaderPasses[i].outputSize.x = (double)shaderPasses[i].scaleParams.absX;
            break;
        case CG_SCALE_SOURCE:
            shaderPasses[i].outputSize.x = shaderPasses[i - 1].outputSize.x * shaderPasses[i].scaleParams.scaleX;
            break;
        case CG_SCALE_VIEWPORT:
            shaderPasses[i].outputSize.x = viewportSize.x * shaderPasses[i].scaleParams.scaleX;
            break;
        default:
            shaderPasses[i].outputSize.x = viewportSize.x;
        }

        switch (shaderPasses[i].scaleParams.scaleTypeY)
        {
        case CG_SCALE_ABSOLUTE:
            shaderPasses[i].outputSize.y = (double)shaderPasses[i].scaleParams.absY;
            break;
        case CG_SCALE_SOURCE:
            shaderPasses[i].outputSize.y = shaderPasses[i - 1].outputSize.y * shaderPasses[i].scaleParams.scaleY;
            break;
        case CG_SCALE_VIEWPORT:
            shaderPasses[i].outputSize.y = viewportSize.y * shaderPasses[i].scaleParams.scaleY;
            break;
        default:
            shaderPasses[i].outputSize.y = viewportSize.y;
        }

        /* use next power of two in both directions
     */
        float texSize = npot(max(shaderPasses[i].outputSize.x, shaderPasses[i].outputSize.y));
        shaderPasses[i].textureSize.x = shaderPasses[i].textureSize.y = texSize;

        /* set size of output texture
     */
        glBindTexture(GL_TEXTURE_2D, shaderPasses[i].tex);
        glTexImage2D(GL_TEXTURE_2D,
            0,
            (shaderPasses[i].floatFbo ? GL_RGBA32F : GL_RGBA),
            (unsigned int)shaderPasses[i].textureSize.x,
            (unsigned int)shaderPasses[i].textureSize.y,
            0,
            GL_RGBA,
            GL_UNSIGNED_INT_8_8_8_8,
            NULL);

        /* viewport determines the area we render into the output texture
     */
        glViewport(
            0, 0, shaderPasses[i].outputSize.x, shaderPasses[i].outputSize.y);

        /* set up framebuffer and attach output texture
     */
        glBindFramebuffer(GL_FRAMEBUFFER, shaderPasses[i].fbo);
        glFramebufferTexture2D(GL_FRAMEBUFFER,
            GL_COLOR_ATTACHMENT0,
            GL_TEXTURE_2D,
            shaderPasses[i].tex,
            0);

        /* set up input texture (output of previous pass) and apply filter settings
     */
        glBindTexture(GL_TEXTURE_2D, shaderPasses[i - 1].tex);
        glPixelStorei(GL_UNPACK_ROW_LENGTH,
            (GLint)shaderPasses[i - 1].textureSize.x);
        glTexParameteri(GL_TEXTURE_2D,
            GL_TEXTURE_MAG_FILTER,
            shaderPasses[i].linearFilter ? GL_LINEAR : GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D,
            GL_TEXTURE_MIN_FILTER,
            shaderPasses[i].linearFilter ? GL_LINEAR : GL_NEAREST);

        /* calculate tex coords first since we pass them to the shader
     */
        setTexCoords(
            i, shaderPasses[i - 1].outputSize, shaderPasses[i - 1].textureSize);

        setShaderVars(i);

        cgGLBindProgram(shaderPasses[i].cgVertexProgram);
        cgGLBindProgram(shaderPasses[i].cgFragmentProgram);

        glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
        glClear(GL_COLOR_BUFFER_BIT);
        glDrawArrays(GL_QUADS, 0, 4);

        /* reset client states enabled during setShaderVars
     */
        resetAttribParams();
    }

    /* disable framebuffer
   */
    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    /* set last PREV texture as original, push current texture and
         sizes to the front of the PREV deque and make sure the new
         original texture has the same size as the old one
      */

    origTex = prevPasses.back().tex;
    prevPasses.pop_back();

    prevPass pass;
    pass.videoSize = inputSize;
    pass.textureSize = textureSize;
    pass.tex = shaderPasses[0].tex;
    memcpy(pass.texCoords, shaderPasses[1].texcoords, sizeof(pass.texCoords));
    prevPasses.push_front(pass);
    GLint internal_format;
    glBindTexture(GL_TEXTURE_2D, pass.tex);
    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internal_format);

    glBindTexture(GL_TEXTURE_2D, origTex);
    glTexImage2D(GL_TEXTURE_2D,
        0,
        internal_format,
        textureSize.x,
        textureSize.y,
        0,
        GL_RGB,
        GL_UNSIGNED_SHORT_5_6_5,
        NULL);

    /* bind output of last pass to be rendered on the backbuffer
   */
    glBindTexture(GL_TEXTURE_2D, shaderPasses.back().tex);
    glPixelStorei(GL_UNPACK_ROW_LENGTH, (GLint)shaderPasses.back().textureSize.x);

    /* calculate and apply viewport and texture coordinates to
         that will be used in the main ogl code
      */

    setTexCoords(shaderPasses.size() - 1,
        shaderPasses.back().outputSize,
        shaderPasses.back().textureSize,
        true);

    /* render to backbuffer without shaders
   */
    cgGLDisableProfile(vertexProfile);
    cgGLDisableProfile(fragmentProfile);
}

void CGLCG::setShaderVars(int pass)
{
    /* mvp paramater
   */
    CGparameter cgpModelViewProj = cgGetNamedParameter(shaderPasses[pass].cgVertexProgram, "modelViewProj");
    if (cgpModelViewProj)
        cgGLSetStateMatrixParameter(cgpModelViewProj,
            CG_GL_MODELVIEW_PROJECTION_MATRIX,
            CG_GL_MATRIX_IDENTITY);

#define setProgram2fv(pass, varname, floats)                                                   \
    {                                                                                          \
        CGparameter cgpf = cgGetNamedParameter(shaderPasses[pass].cgFragmentProgram, varname); \
        CGparameter cgpv = cgGetNamedParameter(shaderPasses[pass].cgVertexProgram, varname);   \
        if (cgpf)                                                                              \
            cgGLSetParameter2fv(cgpf, floats);                                                 \
        if (cgpv)                                                                              \
            cgGLSetParameter2fv(cgpv, floats);                                                 \
    }

#define setProgram1f(pass, varname, val)                                                       \
    {                                                                                          \
        CGparameter cgpf = cgGetNamedParameter(shaderPasses[pass].cgFragmentProgram, varname); \
        CGparameter cgpv = cgGetNamedParameter(shaderPasses[pass].cgVertexProgram, varname);   \
        if (cgpf)                                                                              \
            cgGLSetParameter1f(cgpf, val);                                                     \
        if (cgpv)                                                                              \
            cgGLSetParameter1f(cgpv, val);                                                     \
    }

#define setTextureParameter(pass, varname, val)                                                \
    {                                                                                          \
        CGparameter cgpf = cgGetNamedParameter(shaderPasses[pass].cgFragmentProgram, varname); \
        if (cgpf) {                                                                            \
            cgGLSetTextureParameter(cgpf, val);                                                \
            cgGLEnableTextureParameter(cgpf);                                                  \
        }                                                                                      \
    }

#define setTexCoordsParameter(pass, varname, val)                                            \
    {                                                                                        \
        CGparameter cgpv = cgGetNamedParameter(shaderPasses[pass].cgVertexProgram, varname); \
        if (cgpv) {                                                                          \
            cgGLSetParameterPointer(cgpv, 2, GL_FLOAT, 0, val);                              \
            cgGLEnableClientState(cgpv);                                                     \
            cgAttribParams.push_back(cgpv);                                                  \
        }                                                                                    \
    }

    /* IN paramater
   */
    float inputSize[2] = { (float) shaderPasses[pass - 1].outputSize.x,
        (float) shaderPasses[pass - 1].outputSize.y };
    float textureSize[2] = { (float) shaderPasses[pass - 1].textureSize.x,
        (float) shaderPasses[pass - 1].textureSize.y };
    float outputSize[2] = { (float) shaderPasses[pass].outputSize.x,
        (float) shaderPasses[pass].outputSize.y };

    setProgram2fv(pass, "IN.video_size", inputSize);
    setProgram2fv(pass, "IN.texture_size", textureSize);
    setProgram2fv(pass, "IN.output_size", outputSize);
    unsigned int shaderFrameCnt = frameCnt;
    if (shaderPasses[pass].frameCounterMod)
        shaderFrameCnt %= shaderPasses[pass].frameCounterMod;
    setProgram1f(pass, "IN.frame_count", (float)shaderFrameCnt);
    setProgram1f(
        pass, "IN.frame_direction", Settings.Rewinding ? -1.0f : 1.0f);

    /* ORIG parameter
   */
    float orig_videoSize[2] = { (float) shaderPasses[0].outputSize.x,
        (float) shaderPasses[0].outputSize.y };
    float orig_textureSize[2] = { (float) shaderPasses[0].textureSize.x,
        (float) shaderPasses[0].textureSize.y };

    setProgram2fv(pass, "ORIG.video_size", orig_videoSize);
    setProgram2fv(pass, "ORIG.texture_size", orig_textureSize);
    setTextureParameter(pass, "ORIG.texture", shaderPasses[0].tex);
    setTexCoordsParameter(pass, "ORIG.tex_coord", shaderPasses[1].texcoords);       

    /* PREV parameter
   */
    if (prevPasses[0].textureSize.x > 0) {
        float prev_videoSize[2] = { (float) prevPasses[0].videoSize.x,
            (float) prevPasses[0].videoSize.y };
        float prev_textureSize[2] = { (float) prevPasses[0].textureSize.x,
            (float) prevPasses[0].textureSize.y };

        setProgram2fv(pass, "PREV.video_size", prev_videoSize);
        setProgram2fv(pass, "PREV.texture_size", prev_textureSize);
        setTextureParameter(pass, "PREV.texture", prevPasses[0].tex);
        setTexCoordsParameter(pass, "PREV.tex_coord", prevPasses[0].texCoords);
    }

    /* PREV1-6 parameters
   */
    for (unsigned int i = 1; i < prevPasses.size(); i++)
    {
        if (prevPasses[i].textureSize.x == 0)
            break;
        char varname[100];
        float prev_videoSize[2] = { (float) prevPasses[i].videoSize.x,
            (float) prevPasses[i].videoSize.y };
        float prev_textureSize[2] = { (float) prevPasses[i].textureSize.x,
            (float) prevPasses[i].textureSize.y };
        sprintf(varname, "PREV%d.video_size", i);
        setProgram2fv(pass, varname, prev_videoSize);
        sprintf(varname, "PREV%d.texture_size", i);
        setProgram2fv(pass, varname, prev_textureSize);
        sprintf(varname, "PREV%d.texture", i);
        setTextureParameter(pass, varname, prevPasses[i].tex);
        sprintf(varname, "PREV%d.tex_coord", i);
        setTexCoordsParameter(pass, varname, prevPasses[i].texCoords);
    }

    /* LUT parameters
   */
    for (unsigned int i = 0; i < lookupTextures.size(); i++) {
        setTextureParameter(pass, lookupTextures[i].id, lookupTextures[i].tex);
    }

    /* PASSX parameters, only for third pass and up
   */
    if (pass > 2) {
        for (int i = 1; i < pass - 1; i++) {
            char varname[100];
            float pass_videoSize[2] = { (float) shaderPasses[i].outputSize.x,
                (float) shaderPasses[i].outputSize.y };
            float pass_textureSize[2] = { (float) shaderPasses[i].textureSize.x,
                (float) shaderPasses[i].textureSize.y };
            sprintf(varname, "PASS%d.video_size", i);
            setProgram2fv(pass, varname, pass_videoSize);
            sprintf(varname, "PASS%d.texture_size", i);
            setProgram2fv(pass, varname, pass_textureSize);
            sprintf(varname, "PASS%d.texture", i);
            setTextureParameter(pass, varname, shaderPasses[i].tex);
            sprintf(varname, "PASS%d.tex_coord", i);
            setTexCoordsParameter(pass, varname, shaderPasses[i + 1].texcoords);
        }
    }

    /* PASSPREV parameter */
    for (int i = 0; i < pass; i++)
    {
        char varname[100];
        float pass_videoSize[2] = { (float) shaderPasses[i].outputSize.x,
            (float) shaderPasses[i].outputSize.y };
        float pass_textureSize[2] = { (float) shaderPasses[i].textureSize.x,
            (float) shaderPasses[i].textureSize.y };
        sprintf(varname, "PASSPREV%d.video_size", pass - i);
        setProgram2fv(pass, varname, pass_videoSize);
        sprintf(varname, "PASSPREV%d.texture_size", pass - i);
        setProgram2fv(pass, varname, pass_textureSize);
        sprintf(varname, "PASSPREV%d.texture", pass - i);
        setTextureParameter(pass, varname, shaderPasses[i].tex);
        sprintf(varname, "PASSPREV%d.tex_coord", pass - i);
        setTexCoordsParameter(pass, varname, shaderPasses[i + 1].texcoords);
    }
}

void CGLCG::resetAttribParams()
{
    for (unsigned int i = 0; i < cgAttribParams.size(); i++)
        cgGLDisableClientState(cgAttribParams[i]);
    cgAttribParams.clear();
}