/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2010 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#if SDL_VIDEO_RENDER_OGL

#include "SDL_video.h"

#include "SDL_opengl.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_rect_c.h"

#include "SDL_yuv_sw_c.h"

#ifdef __MACOSX__

#include <OpenGL/OpenGL.h>

#endif

/* OpenGL renderer implementation */

/* Details on optimizing the texture path on Mac OS X:

   http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/chapter_10_section_2.html

*/

/* !!! FIXME: this should go in a higher level than the GL renderer. */

static __inline__ int

bytes_per_pixel(const Uint32 format)

{

    if (!SDL_ISPIXELFORMAT_FOURCC(format)) {

        return SDL_BYTESPERPIXEL(format);

    }

    /* FOURCC format */

    switch (format) {

    case SDL_PIXELFORMAT_YV12:

    case SDL_PIXELFORMAT_IYUV:

    case SDL_PIXELFORMAT_YUY2:

    case SDL_PIXELFORMAT_UYVY:

    case SDL_PIXELFORMAT_YVYU:

        return 2;

    default:

        return 1;               /* shouldn't ever hit this. */

    }

}

static const float inv255f = 1.0f / 255.0f;

static SDL_Renderer *GL_CreateRenderer(SDL_Window * window, Uint32 flags);

static int GL_ActivateRenderer(SDL_Renderer * renderer);

static int GL_DisplayModeChanged(SDL_Renderer * renderer);

static int GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static int GL_QueryTexturePixels(SDL_Renderer * renderer,

                                 SDL_Texture * texture, void **pixels,

                                 int *pitch);

static int GL_SetTexturePalette(SDL_Renderer * renderer,

                                SDL_Texture * texture,

                                const SDL_Color * colors, int firstcolor,

                                int ncolors);

static int GL_GetTexturePalette(SDL_Renderer * renderer,

                                SDL_Texture * texture, SDL_Color * colors,

                                int firstcolor, int ncolors);

static int GL_SetTextureColorMod(SDL_Renderer * renderer,

                                 SDL_Texture * texture);

static int GL_SetTextureAlphaMod(SDL_Renderer * renderer,

                                 SDL_Texture * texture);

static int GL_SetTextureBlendMode(SDL_Renderer * renderer,

                                  SDL_Texture * texture);

static int GL_SetTextureScaleMode(SDL_Renderer * renderer,

                                  SDL_Texture * texture);

static int GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                            const SDL_Rect * rect, const void *pixels,

                            int pitch);

static int GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                          const SDL_Rect * rect, int markDirty, void **pixels,

                          int *pitch);

static void GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static void GL_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                            int numrects, const SDL_Rect * rects);

static int GL_RenderClear(SDL_Renderer * renderer);

static int GL_RenderDrawPoints(SDL_Renderer * renderer,

                               const SDL_Point * points, int count);

static int GL_RenderDrawLines(SDL_Renderer * renderer,

                              const SDL_Point * points, int count);

static int GL_RenderDrawRects(SDL_Renderer * renderer,

                              const SDL_Rect ** rects, int count);

static int GL_RenderFillRects(SDL_Renderer * renderer,

                              const SDL_Rect ** rects, int count);

static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

                         const SDL_Rect * srcrect, const SDL_Rect * dstrect);

static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,

                               Uint32 pixel_format, void * pixels, int pitch);

static int GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,

                                Uint32 pixel_format, const void * pixels, int pitch);

static void GL_RenderPresent(SDL_Renderer * renderer);

static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static void GL_DestroyRenderer(SDL_Renderer * renderer);

SDL_RenderDriver GL_RenderDriver = {

    GL_CreateRenderer,

    {

     "opengl",

     (SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTDISCARD |

      SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),

     (SDL_TEXTUREMODULATE_NONE | SDL_TEXTUREMODULATE_COLOR |

      SDL_TEXTUREMODULATE_ALPHA),

     (SDL_BLENDMODE_NONE | SDL_BLENDMODE_MASK |

      SDL_BLENDMODE_BLEND | SDL_BLENDMODE_ADD | SDL_BLENDMODE_MOD),

     (SDL_SCALEMODE_NONE | SDL_SCALEMODE_FAST | SDL_SCALEMODE_SLOW),

     15,

     {

      SDL_PIXELFORMAT_INDEX1LSB,

      SDL_PIXELFORMAT_INDEX1MSB,

      SDL_PIXELFORMAT_INDEX8,

      SDL_PIXELFORMAT_RGB332,

      SDL_PIXELFORMAT_RGB444,

      SDL_PIXELFORMAT_RGB555,

      SDL_PIXELFORMAT_ARGB4444,

      SDL_PIXELFORMAT_ARGB1555,

      SDL_PIXELFORMAT_RGB565,

      SDL_PIXELFORMAT_RGB24,

      SDL_PIXELFORMAT_BGR24,

      SDL_PIXELFORMAT_RGB888,

      SDL_PIXELFORMAT_BGR888,

      SDL_PIXELFORMAT_ARGB8888,

      SDL_PIXELFORMAT_ABGR8888,

      SDL_PIXELFORMAT_ARGB2101010},

     0,

     0}

};

typedef struct

{

    SDL_GLContext context;

    SDL_bool updateSize;

    SDL_bool GL_ARB_texture_rectangle_supported;

    SDL_bool GL_EXT_paletted_texture_supported;

    SDL_bool GL_APPLE_ycbcr_422_supported;

    SDL_bool GL_MESA_ycbcr_texture_supported;

    SDL_bool GL_ARB_fragment_program_supported;

    int blendMode;

    int scaleMode;

    /* OpenGL functions */

#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;

#include "SDL_glfuncs.h"

#undef SDL_PROC

    PFNGLCOLORTABLEEXTPROC glColorTableEXT;

    void (*glTextureRangeAPPLE) (GLenum target, GLsizei length,

                                 const GLvoid * pointer);

    PFNGLGETPROGRAMIVARBPROC glGetProgramivARB;

    PFNGLGETPROGRAMSTRINGARBPROC glGetProgramStringARB;

    PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB;

    PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB;

    PFNGLGENPROGRAMSARBPROC glGenProgramsARB;

    PFNGLBINDPROGRAMARBPROC glBindProgramARB;

    PFNGLPROGRAMSTRINGARBPROC glProgramStringARB;

    /* (optional) fragment programs */

    GLuint fragment_program_mask;

    GLuint fragment_program_UYVY;

} GL_RenderData;

typedef struct

{

    GLuint texture;

    GLuint shader;

    GLenum type;

    GLfloat texw;

    GLfloat texh;

    GLenum format;

    GLenum formattype;

    Uint8 *palette;

    void *pixels;

    int pitch;

    SDL_DirtyRectList dirty;

    int HACK_RYAN_FIXME;

} GL_TextureData;

static void

GL_SetError(const char *prefix, GLenum result)

{

    const char *error;

    switch (result) {

    case GL_NO_ERROR:

        error = "GL_NO_ERROR";

        break;

    case GL_INVALID_ENUM:

        error = "GL_INVALID_ENUM";

        break;

    case GL_INVALID_VALUE:

        error = "GL_INVALID_VALUE";

        break;

    case GL_INVALID_OPERATION:

        error = "GL_INVALID_OPERATION";

        break;

    case GL_STACK_OVERFLOW:

        error = "GL_STACK_OVERFLOW";

        break;

    case GL_STACK_UNDERFLOW:

        error = "GL_STACK_UNDERFLOW";

        break;

    case GL_OUT_OF_MEMORY:

        error = "GL_OUT_OF_MEMORY";

        break;

    case GL_TABLE_TOO_LARGE:

        error = "GL_TABLE_TOO_LARGE";

        break;

    default:

        error = "UNKNOWN";

        break;

    }

    SDL_SetError("%s: %s", prefix, error);

}

static int

GL_LoadFunctions(GL_RenderData * data)

{

#if defined(__QNXNTO__) && (_NTO_VERSION < 630)

#define __SDL_NOGETPROCADDR__

#endif

#ifdef __SDL_NOGETPROCADDR__

#define SDL_PROC(ret,func,params) data->func=func;

#else

#define SDL_PROC(ret,func,params) \

    do { \

        data->func = SDL_GL_GetProcAddress(#func); \

        if ( ! data->func ) { \

            SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \

            return -1; \

        } \

    } while ( 0 );

#endif /* __SDL_NOGETPROCADDR__ */

#include "SDL_glfuncs.h"

#undef SDL_PROC

    return 0;

}

SDL_Renderer *

GL_CreateRenderer(SDL_Window * window, Uint32 flags)

{

    SDL_Renderer *renderer;

    GL_RenderData *data;

    GLint value;

    int doublebuffer;

    /* Render directly to the window, unless we're compositing */

#ifndef __MACOSX__

    if (flags & SDL_RENDERER_SINGLEBUFFER) {

        SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 0);

    }

#endif

    if (!(window->flags & SDL_WINDOW_OPENGL)) {

        if (SDL_RecreateWindow(window, window->flags | SDL_WINDOW_OPENGL) < 0) {

            return NULL;

        }

    }

    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));

    if (!renderer) {

        SDL_OutOfMemory();

        return NULL;

    }

    data = (GL_RenderData *) SDL_calloc(1, sizeof(*data));

    if (!data) {

        GL_DestroyRenderer(renderer);

        SDL_OutOfMemory();

        return NULL;

    }

    renderer->ActivateRenderer = GL_ActivateRenderer;

    renderer->DisplayModeChanged = GL_DisplayModeChanged;

    renderer->CreateTexture = GL_CreateTexture;

    renderer->QueryTexturePixels = GL_QueryTexturePixels;

    renderer->SetTexturePalette = GL_SetTexturePalette;

    renderer->GetTexturePalette = GL_GetTexturePalette;

    renderer->SetTextureColorMod = GL_SetTextureColorMod;

    renderer->SetTextureAlphaMod = GL_SetTextureAlphaMod;

    renderer->SetTextureBlendMode = GL_SetTextureBlendMode;

    renderer->SetTextureScaleMode = GL_SetTextureScaleMode;

    renderer->UpdateTexture = GL_UpdateTexture;

    renderer->LockTexture = GL_LockTexture;

    renderer->UnlockTexture = GL_UnlockTexture;

    renderer->DirtyTexture = GL_DirtyTexture;

    renderer->RenderClear = GL_RenderClear;

    renderer->RenderDrawPoints = GL_RenderDrawPoints;

    renderer->RenderDrawLines = GL_RenderDrawLines;

    renderer->RenderDrawRects = GL_RenderDrawRects;

    renderer->RenderFillRects = GL_RenderFillRects;

    renderer->RenderCopy = GL_RenderCopy;

    renderer->RenderReadPixels = GL_RenderReadPixels;

    renderer->RenderWritePixels = GL_RenderWritePixels;

    renderer->RenderPresent = GL_RenderPresent;

    renderer->DestroyTexture = GL_DestroyTexture;

    renderer->DestroyRenderer = GL_DestroyRenderer;

    renderer->info = GL_RenderDriver.info;

    renderer->window = window;

    renderer->driverdata = data;

    renderer->info.flags =

        (SDL_RENDERER_PRESENTDISCARD | SDL_RENDERER_ACCELERATED);

    if (GL_LoadFunctions(data) < 0) {

        GL_DestroyRenderer(renderer);

        return NULL;

    }

    data->context = SDL_GL_CreateContext(window);

    if (!data->context) {

        GL_DestroyRenderer(renderer);

        return NULL;

    }

    if (SDL_GL_MakeCurrent(window, data->context) < 0) {

        GL_DestroyRenderer(renderer);

        return NULL;

    }

#ifdef __MACOSX__

    /* Enable multi-threaded rendering */

    /* Disabled until Ryan finishes his VBO/PBO code...

       CGLEnable(CGLGetCurrentContext(), kCGLCEMPEngine);

     */

#endif

    if (flags & SDL_RENDERER_PRESENTVSYNC) {

        SDL_GL_SetSwapInterval(1);

    } else {

        SDL_GL_SetSwapInterval(0);

    }

    if (SDL_GL_GetSwapInterval() > 0) {

        renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;

    }

    if (SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &doublebuffer) == 0) {

        if (!doublebuffer) {

            renderer->info.flags |= SDL_RENDERER_SINGLEBUFFER;

        }

    }

    data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);

    renderer->info.max_texture_width = value;

    data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);

    renderer->info.max_texture_height = value;

    if (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle")

        || SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {

        data->GL_ARB_texture_rectangle_supported = SDL_TRUE;

    }

    if (SDL_GL_ExtensionSupported("GL_EXT_paletted_texture")) {

        data->GL_EXT_paletted_texture_supported = SDL_TRUE;

        data->glColorTableEXT =

            (PFNGLCOLORTABLEEXTPROC) SDL_GL_GetProcAddress("glColorTableEXT");

    } else {

        /* Don't advertise support for 8-bit indexed texture format */

        Uint32 i, j;

        SDL_RendererInfo *info = &renderer->info;

        for (i = 0, j = 0; i < info->num_texture_formats; ++i) {

            if (info->texture_formats[i] != SDL_PIXELFORMAT_INDEX8) {

                info->texture_formats[j++] = info->texture_formats[i];

            }

        }

        --info->num_texture_formats;

    }

    if (SDL_GL_ExtensionSupported("GL_APPLE_ycbcr_422")) {

        data->GL_APPLE_ycbcr_422_supported = SDL_TRUE;

    }

    if (SDL_GL_ExtensionSupported("GL_MESA_ycbcr_texture")) {

        data->GL_MESA_ycbcr_texture_supported = SDL_TRUE;

    }

    if (SDL_GL_ExtensionSupported("GL_APPLE_texture_range")) {

        data->glTextureRangeAPPLE =

            (void (*)(GLenum, GLsizei, const GLvoid *))

            SDL_GL_GetProcAddress("glTextureRangeAPPLE");

    }

    /* we might use fragment programs for YUV data, etc. */

    if (SDL_GL_ExtensionSupported("GL_ARB_fragment_program")) {

        /* !!! FIXME: this doesn't check for errors. */

        /* !!! FIXME: this should really reuse the glfuncs.h stuff. */

        data->glGetProgramivARB = (PFNGLGETPROGRAMIVARBPROC)

            SDL_GL_GetProcAddress("glGetProgramivARB");

        data->glGetProgramStringARB = (PFNGLGETPROGRAMSTRINGARBPROC)

            SDL_GL_GetProcAddress("glGetProgramStringARB");

        data->glProgramLocalParameter4fvARB =

            (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC)

            SDL_GL_GetProcAddress("glProgramLocalParameter4fvARB");

        data->glDeleteProgramsARB = (PFNGLDELETEPROGRAMSARBPROC)

            SDL_GL_GetProcAddress("glDeleteProgramsARB");

        data->glGenProgramsARB = (PFNGLGENPROGRAMSARBPROC)

            SDL_GL_GetProcAddress("glGenProgramsARB");

        data->glBindProgramARB = (PFNGLBINDPROGRAMARBPROC)

            SDL_GL_GetProcAddress("glBindProgramARB");

        data->glProgramStringARB = (PFNGLPROGRAMSTRINGARBPROC)

            SDL_GL_GetProcAddress("glProgramStringARB");

        data->GL_ARB_fragment_program_supported = SDL_TRUE;

    }

    /* Set up parameters for rendering */

    data->blendMode = -1;

    data->scaleMode = -1;

    data->glDisable(GL_DEPTH_TEST);

    data->glDisable(GL_CULL_FACE);

    /* This ended up causing video discrepancies between OpenGL and Direct3D */

    /*data->glEnable(GL_LINE_SMOOTH);*/

    if (data->GL_ARB_texture_rectangle_supported) {

        data->glEnable(GL_TEXTURE_RECTANGLE_ARB);

    } else {

        data->glEnable(GL_TEXTURE_2D);

    }

    data->updateSize = SDL_TRUE;

    return renderer;

}

static int

GL_ActivateRenderer(SDL_Renderer * renderer)

{

    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;

    SDL_Window *window = renderer->window;

    if (SDL_GL_MakeCurrent(window, data->context) < 0) {

        return -1;

    }

    if (data->updateSize) {

        data->glMatrixMode(GL_PROJECTION);

        data->glLoadIdentity();

        data->glMatrixMode(GL_MODELVIEW);

        data->glLoadIdentity();

        data->glViewport(0, 0, window->w, window->h);

        data->glOrtho(0.0, (GLdouble) window->w,

                      (GLdouble) window->h, 0.0, 0.0, 1.0);

        data->updateSize = SDL_FALSE;

    }

    return 0;

}

static int

GL_DisplayModeChanged(SDL_Renderer * renderer)

{

    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;

    /* Rebind the context to the window area and update matrices */

    data->updateSize = SDL_TRUE;

    return GL_ActivateRenderer(renderer);

}

static __inline__ int

power_of_2(int input)

{

    int value = 1;

    while (value < input) {

        value <<= 1;

    }

    return value;

}

//#define DEBUG_PROGRAM_COMPILE 1

static void

set_shader_error(GL_RenderData * data, const char *prefix)

{

    GLint pos = 0;

    const GLubyte *errstr;

    data->glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &pos);

    errstr = data->glGetString(GL_PROGRAM_ERROR_STRING_ARB);

    SDL_SetError("%s: shader compile error at position %d: %s",

           prefix, (int) pos, (const char *) errstr);

}

static GLuint

compile_shader(GL_RenderData * data, GLenum shader_type, const char *_code)

{

    const int have_texture_rects = data->GL_ARB_texture_rectangle_supported;

    const char *replacement = have_texture_rects ? "RECT" : "2D";

    const size_t replacementlen = SDL_strlen(replacement);

    const char *token = "%TEXTURETARGET%";

    const size_t tokenlen = SDL_strlen(token);

    char *code = NULL;

    char *ptr = NULL;

    GLuint program = 0;

    /*

     * The TEX instruction needs a different target depending on what we use.

     *  To handle this, we use "%TEXTURETARGET%" and replace the string before

     *  compiling the shader.

     */

    code = SDL_strdup(_code);

    if (code == NULL)

        return 0;

    for (ptr = SDL_strstr(code, token); ptr; ptr = SDL_strstr(ptr + 1, token)) {

        SDL_memcpy(ptr, replacement, replacementlen);

        SDL_memmove(ptr + replacementlen, ptr + tokenlen,

                    SDL_strlen(ptr + tokenlen) + 1);

    }

#if DEBUG_PROGRAM_COMPILE

    printf("compiling shader:\n%s\n\n", code);

#endif

    data->glGetError();         /* flush any existing error state. */

    data->glGenProgramsARB(1, &program);

    data->glBindProgramARB(shader_type, program);

    data->glProgramStringARB(shader_type, GL_PROGRAM_FORMAT_ASCII_ARB,

                             (GLsizei)SDL_strlen(code), code);

    SDL_free(code);

    if (data->glGetError() == GL_INVALID_OPERATION) {

#if DEBUG_PROGRAM_COMPILE

        GLint pos = 0;

        const GLubyte *errstr;

        data->glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &pos);

        errstr = data->glGetString(GL_PROGRAM_ERROR_STRING_ARB);

        printf("program compile error at position %d: %s\n\n",

               (int) pos, (const char *) errstr);

#endif

        data->glBindProgramARB(shader_type, 0);

        data->glDeleteProgramsARB(1, &program);

        return 0;

    }

    return program;

}

/*

 * Fragment program that implements mask semantics

 */

static const char *fragment_program_mask_source_code = "!!ARBfp1.0\n"

"OUTPUT output = result.color;\n"

"TEMP value;\n"

"TEX value, fragment.texcoord[0], texture[0], %TEXTURETARGET%;\n"

"MUL value, fragment.color, value;\n"

"SGE value.a, value.a, 0.001;\n"

"MOV output, value;\n"

"END";

/*

 * Fragment program that renders from UYVY textures.

 * The UYVY to RGB equasion is:

 *   R = 1.164(Y-16) + 1.596(Cr-128)

 *   G = 1.164(Y-16) - 0.813(Cr-128) - 0.391(Cb-128)

 *   B = 1.164(Y-16) + 2.018(Cb-128)

 * Byte layout is Cb, Y1, Cr, Y2, stored in the R, G, B, A channels.

 * 4 bytes == 2 pixels: Y1/Cb/Cr, Y2/Cb/Cr

 *

 * !!! FIXME: this ignores blendmodes, etc.

 * !!! FIXME: this could be more efficient...use a dot product for green, etc.

 */

static const char *fragment_program_UYVY_source_code = "!!ARBfp1.0\n"

    /* outputs... */

    "OUTPUT outcolor = result.color;\n"

    /* scratch registers... */

    "TEMP uyvy;\n" "TEMP luminance;\n" "TEMP work;\n"

    /* Halve the coordinates to grab the correct 32 bits for the fragment. */

    "MUL work, fragment.texcoord, { 0.5, 1.0, 1.0, 1.0 };\n"

    /* Sample the YUV texture. Cb, Y1, Cr, Y2, are stored in x, y, z, w. */

    "TEX uyvy, work, texture[0], %TEXTURETARGET%;\n"

    /* Do subtractions (128/255, 16/255, 128/255, 16/255) */

    "SUB uyvy, uyvy, { 0.501960784313726, 0.06274509803922, 0.501960784313726, 0.06274509803922 };\n"

    /* Choose the luminance component by texcoord. */

    /* !!! FIXME: laziness wins out for now... just average Y1 and Y2. */

    "ADD luminance, uyvy.yyyy, uyvy.wwww;\n"

    "MUL luminance, luminance, { 0.5, 0.5, 0.5, 0.5 };\n"

    /* Multiply luminance by its magic value. */

    "MUL luminance, luminance, { 1.164, 1.164, 1.164, 1.164 };\n"

    /* uyvy.xyzw becomes Cr/Cr/Cb/Cb, with multiplications. */

    "MUL uyvy, uyvy.zzxx, { 1.596, -0.813, 2.018, -0.391 };\n"

    /* Add luminance to Cr and Cb, store to RGB channels. */

    "ADD work.rgb, luminance, uyvy;\n"

    /* Do final addition for Green channel.  (!!! FIXME: this should be a DPH?) */

    "ADD work.g, work.g, uyvy.w;\n"

    /* Make sure alpha channel is fully opaque.  (!!! FIXME: blend modes!) */

    "MOV work.a, { 1.0 };\n"

    /* Store out the final fragment color... */

    "MOV outcolor, work;\n"

    /* ...and we're done! */

    "END\n";

static __inline__ SDL_bool

convert_format(GL_RenderData *renderdata, Uint32 pixel_format,

               GLint* internalFormat, GLenum* format, GLenum* type)

{

    switch (pixel_format) {

    case SDL_PIXELFORMAT_INDEX1LSB:

    case SDL_PIXELFORMAT_INDEX1MSB:

        *internalFormat = GL_RGB;

        *format = GL_COLOR_INDEX;

        *type = GL_BITMAP;

        break;

    case SDL_PIXELFORMAT_INDEX8:

        if (!renderdata->GL_EXT_paletted_texture_supported) {

            return SDL_FALSE;

        }

        *internalFormat = GL_COLOR_INDEX8_EXT;

        *format = GL_COLOR_INDEX;

        *type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PIXELFORMAT_RGB332:

        *internalFormat = GL_R3_G3_B2;

        *format = GL_RGB;

        *type = GL_UNSIGNED_BYTE_3_3_2;

        break;

    case SDL_PIXELFORMAT_RGB444:

        *internalFormat = GL_RGB4;

        *format = GL_RGB;

        *type = GL_UNSIGNED_SHORT_4_4_4_4;

        break;

    case SDL_PIXELFORMAT_RGB555:

        *internalFormat = GL_RGB5;

        *format = GL_RGB;

        *type = GL_UNSIGNED_SHORT_5_5_5_1;

        break;

    case SDL_PIXELFORMAT_ARGB4444:

        *internalFormat = GL_RGBA4;

        *format = GL_BGRA;

        *type = GL_UNSIGNED_SHORT_4_4_4_4_REV;

        break;

    case SDL_PIXELFORMAT_ARGB1555:

        *internalFormat = GL_RGB5_A1;

        *format = GL_BGRA;

        *type = GL_UNSIGNED_SHORT_1_5_5_5_REV;

        break;

    case SDL_PIXELFORMAT_RGB565:

        *internalFormat = GL_RGB8;

        *format = GL_RGB;

        *type = GL_UNSIGNED_SHORT_5_6_5;

        break;

    case SDL_PIXELFORMAT_RGB24:

        *internalFormat = GL_RGB8;

        *format = GL_RGB;

        *type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PIXELFORMAT_RGB888:

        *internalFormat = GL_RGB8;

        *format = GL_BGRA;

        *type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PIXELFORMAT_BGR24:

        *internalFormat = GL_RGB8;

        *format = GL_BGR;

        *type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PIXELFORMAT_BGR888:

        *internalFormat = GL_RGB8;

        *format = GL_RGBA;

        *type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PIXELFORMAT_ARGB8888:

#ifdef __MACOSX__

        *internalFormat = GL_RGBA;

        *format = GL_BGRA;

        *type = GL_UNSIGNED_INT_8_8_8_8_REV;

#else

        *internalFormat = GL_RGBA8;

        *format = GL_BGRA;

        *type = GL_UNSIGNED_BYTE;

#endif

        break;

    case SDL_PIXELFORMAT_ABGR8888:

        *internalFormat = GL_RGBA8;

        *format = GL_RGBA;

        *type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PIXELFORMAT_ARGB2101010:

        *internalFormat = GL_RGB10_A2;

        *format = GL_BGRA;

        *type = GL_UNSIGNED_INT_2_10_10_10_REV;

        break;

    case SDL_PIXELFORMAT_UYVY:

        if (renderdata->GL_APPLE_ycbcr_422_supported) {

            *internalFormat = GL_RGB;

            *format = GL_YCBCR_422_APPLE;

#if SDL_BYTEORDER == SDL_LIL_ENDIAN

            *type = GL_UNSIGNED_SHORT_8_8_APPLE;

#else

            *type = GL_UNSIGNED_SHORT_8_8_REV_APPLE;

#endif

        } else if (renderdata->GL_MESA_ycbcr_texture_supported) {

            *internalFormat = GL_YCBCR_MESA;

            *format = GL_YCBCR_MESA;

#if SDL_BYTEORDER == SDL_LIL_ENDIAN

            *type = GL_UNSIGNED_SHORT_8_8_MESA;

#else

            *type = GL_UNSIGNED_SHORT_8_8_REV_MESA;

#endif

        } else if (renderdata->GL_ARB_fragment_program_supported) {

            *internalFormat = GL_RGBA;

            *format = GL_RGBA;

            *type = GL_UNSIGNED_BYTE;

        } else {

            return SDL_FALSE;

        }

        break;

    case SDL_PIXELFORMAT_YUY2:

        if (renderdata->GL_APPLE_ycbcr_422_supported) {

            *internalFormat = GL_RGB;

            *format = GL_YCBCR_422_APPLE;

#if SDL_BYTEORDER == SDL_LIL_ENDIAN

            *type = GL_UNSIGNED_SHORT_8_8_REV_APPLE;

#else

            *type = GL_UNSIGNED_SHORT_8_8_APPLE;

#endif

        } else if (renderdata->GL_MESA_ycbcr_texture_supported) {

            *internalFormat = GL_YCBCR_MESA;

            *format = GL_YCBCR_MESA;

#if SDL_BYTEORDER == SDL_LIL_ENDIAN

            *type = GL_UNSIGNED_SHORT_8_8_REV_MESA;

#else

            *type = GL_UNSIGNED_SHORT_8_8_MESA;

#endif

        } else {

            return SDL_FALSE;

        }

        break;

    default:

        return SDL_FALSE;

    }

    return SDL_TRUE;

}

static int

GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

    GL_TextureData *data;

    GLint internalFormat;

    GLenum format, type;

    int texture_w, texture_h;

    GLuint shader = 0;

    GLenum result;

    if (!convert_format(renderdata, texture->format, &internalFormat,

                        &format, &type)) {

        SDL_SetError("Texture format %s not supported by OpenGL",

                     SDL_GetPixelFormatName(texture->format));

        return -1;

    }

    if (texture->format == SDL_PIXELFORMAT_UYVY &&

        !renderdata->GL_APPLE_ycbcr_422_supported &&

        !renderdata->GL_MESA_ycbcr_texture_supported &&

        renderdata->GL_ARB_fragment_program_supported) {

        if (renderdata->fragment_program_UYVY == 0) {

            renderdata->fragment_program_UYVY =

                compile_shader(renderdata, GL_FRAGMENT_PROGRAM_ARB,

                               fragment_program_UYVY_source_code);

            if (renderdata->fragment_program_UYVY == 0) {

                set_shader_error(renderdata, "UYVY");

                return -1;

            }

        }

        shader = renderdata->fragment_program_UYVY;

    }

    data = (GL_TextureData *) SDL_calloc(1, sizeof(*data));

    if (!data) {

        SDL_OutOfMemory();

        return -1;

    }

    data->shader = shader;

    if (texture->format == SDL_PIXELFORMAT_INDEX8) {

        data->palette = (Uint8 *) SDL_malloc(3 * 256 * sizeof(Uint8));

        if (!data->palette) {

            SDL_OutOfMemory();

            SDL_free(data);

            return -1;

        }

        SDL_memset(data->palette, 0xFF, 3 * 256 * sizeof(Uint8));

    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {

        data->pitch = texture->w * bytes_per_pixel(texture->format);

        data->pixels = SDL_malloc(texture->h * data->pitch);

        if (!data->pixels) {

            SDL_OutOfMemory();

            SDL_free(data);

            return -1;

        }

    }

    texture->driverdata = data;

    renderdata->glGetError();

    renderdata->glGenTextures(1, &data->texture);

    if (renderdata->GL_ARB_texture_rectangle_supported) {

        data->type = GL_TEXTURE_RECTANGLE_ARB;

        texture_w = texture->w;

        texture_h = texture->h;

        data->texw = (GLfloat) texture_w;

        data->texh = (GLfloat) texture_h;

    } else {

        data->type = GL_TEXTURE_2D;

        texture_w = power_of_2(texture->w);

        texture_h = power_of_2(texture->h);

        data->texw = (GLfloat) (texture->w) / texture_w;

        data->texh = (GLfloat) texture->h / texture_h;

    }

    /* YUV formats use RGBA but are really two bytes per pixel */

    if (internalFormat == GL_RGBA && bytes_per_pixel(texture->format) < 4) {

        texture_w /= 2;

        if (data->type == GL_TEXTURE_2D) {

            data->texw *= 2.0f;

        }

        data->HACK_RYAN_FIXME = 2;

    } else {

        data->HACK_RYAN_FIXME = 1;

    }

    data->format = format;

    data->formattype = type;

    renderdata->glEnable(data->type);

    renderdata->glBindTexture(data->type, data->texture);

    renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,

                                GL_NEAREST);

    renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,

                                GL_NEAREST);

    renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S,

                                GL_CLAMP_TO_EDGE);

    renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T,

                                GL_CLAMP_TO_EDGE);

#ifdef __MACOSX__

#ifndef GL_TEXTURE_STORAGE_HINT_APPLE

#define GL_TEXTURE_STORAGE_HINT_APPLE       0x85BC

#endif

#ifndef STORAGE_CACHED_APPLE

#define STORAGE_CACHED_APPLE                0x85BE

#endif

#ifndef STORAGE_SHARED_APPLE

#define STORAGE_SHARED_APPLE                0x85BF

#endif

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {

        renderdata->glTexParameteri(data->type, GL_TEXTURE_STORAGE_HINT_APPLE,

                                    GL_STORAGE_SHARED_APPLE);

    } else {

        renderdata->glTexParameteri(data->type, GL_TEXTURE_STORAGE_HINT_APPLE,

                                    GL_STORAGE_CACHED_APPLE);

    }

/* This causes a crash in testoverlay for some reason.  Apple bug? */

#if 0

    if (texture->access == SDL_TEXTUREACCESS_STREAMING

        && texture->format == SDL_PIXELFORMAT_ARGB8888) {

        /*

           if (renderdata->glTextureRangeAPPLE) {

           renderdata->glTextureRangeAPPLE(data->type,

           texture->h * data->pitch,

           data->pixels);

           }

         */

        renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);

        renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,

                                 texture_h, 0, format, type, data->pixels);

    } else

#endif

#endif

    {

        renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,

                                 texture_h, 0, format, type, NULL);

    }

    renderdata->glDisable(data->type);

    result = renderdata->glGetError();

    if (result != GL_NO_ERROR) {

        GL_SetError("glTexImage2D()", result);

        return -1;

    }

    return 0;

}

static int

GL_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,

                      void **pixels, int *pitch)

{

    GL_TextureData *data = (GL_TextureData *) texture->driverdata;

    *pixels = data->pixels;

    *pitch = data->pitch;

    return 0;

}

static int

GL_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

                     const SDL_Color * colors, int firstcolor, int ncolors)

{

    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

    GL_TextureData *data = (GL_TextureData *) texture->driverdata;

    Uint8 *palette;

    if (!data->palette) {

        SDL_SetError("Texture doesn't have a palette");

        return -1;

    }

    palette = data->palette + firstcolor * 3;

    while (ncolors--) {

        *palette++ = colors->r;

        *palette++ = colors->g;

        *palette++ = colors->b;

        ++colors;

    }

    renderdata->glEnable(data->type);

    renderdata->glBindTexture(data->type, data->texture);

    renderdata->glColorTableEXT(data->type, GL_RGB8, 256, GL_RGB,

                                GL_UNSIGNED_BYTE, data->palette);

    return 0;

}

static int

GL_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

                     SDL_Color * colors, int firstcolor, int ncolors)

{

    GL_TextureData *data = (GL_TextureData *) texture->driverdata;

    Uint8 *palette;

    if (!data->palette) {

        SDL_SetError("Texture doesn't have a palette");

        return -1;

    }

    palette = data->palette + firstcolor * 3;

    while (ncolors--) {

        colors->r = *palette++;

        colors->g = *palette++;

        colors->b = *palette++;

        colors->unused = SDL_ALPHA_OPAQUE;

        ++colors;

    }

    return 0;

}

static void

SetupTextureUpdate(GL_RenderData * renderdata, SDL_Texture * texture,

                   int pitch)

{

    if (texture->format == SDL_PIXELFORMAT_INDEX1LSB) {

        renderdata->glPixelStorei(GL_UNPACK_LSB_FIRST, 1);

    } else if (texture->format == SDL_PIXELFORMAT_INDEX1MSB) {

        renderdata->glPixelStorei(GL_UNPACK_LSB_FIRST, 0);

    }

    renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,

                              (pitch / bytes_per_pixel(texture->format)) /

                              ((GL_TextureData *) texture->driverdata)->

                              HACK_RYAN_FIXME);

}

static int

GL_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)

{

    return 0;

}

static int

GL_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)

{

    return 0;

}

static int

GL_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)

{

    switch (texture->blendMode) {

    case SDL_BLENDMODE_NONE:

    case SDL_BLENDMODE_MASK:

    case SDL_BLENDMODE_BLEND:

    case SDL_BLENDMODE_ADD: