--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/render/opengl/SDL_renderer_gl.c	Wed Feb 02 14:34:54 2011 -0800
@@ -0,0 +1,1285 @@
+/*
+    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_opengl.h"
+#include "../SDL_sysrender.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. */
+    }
+}
+
+/* Used to re-create the window with OpenGL capability */
+extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
+
+static const float inv255f = 1.0f / 255.0f;
+
+static SDL_Renderer *GL_CreateRenderer(SDL_Window * window, Uint32 flags);
+static void GL_WindowEvent(SDL_Renderer * renderer,
+                           const SDL_WindowEvent *event);
+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_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_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_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),
+     13,
+     {
+      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;
+
+    /* OpenGL functions */
+#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
+#include "../../video/SDL_glfuncs.h"
+#undef SDL_PROC
+
+    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_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)
+{
+#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 "../../video/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;
+    Uint32 window_flags;
+
+    window_flags = SDL_GetWindowFlags(window);
+    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->WindowEvent = GL_WindowEvent;
+    renderer->CreateTexture = GL_CreateTexture;
+    renderer->QueryTexturePixels = GL_QueryTexturePixels;
+    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->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_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;
+    }
+
+    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_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->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 SDL_GLContext SDL_CurrentContext = NULL;
+
+static int
+GL_ActivateRenderer(SDL_Renderer * renderer)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    SDL_Window *window = renderer->window;
+
+    if (SDL_CurrentContext != data->context) {
+        if (SDL_GL_MakeCurrent(window, data->context) < 0) {
+            return -1;
+        }
+        SDL_CurrentContext = data->context;
+    }
+    if (data->updateSize) {
+        int w, h;
+
+        SDL_GetWindowSize(window, &w, &h);
+        data->glMatrixMode(GL_PROJECTION);
+        data->glLoadIdentity();
+        data->glMatrixMode(GL_MODELVIEW);
+        data->glLoadIdentity();
+        data->glViewport(0, 0, w, h);
+        data->glOrtho(0.0, (GLdouble) w, (GLdouble) h, 0.0, 0.0, 1.0);
+        data->updateSize = SDL_FALSE;
+    }
+    return 0;
+}
+
+static void
+GL_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+
+    if (event->event == SDL_WINDOWEVENT_RESIZED) {
+        /* Rebind the context to the window area and update matrices */
+        SDL_CurrentContext = NULL;
+        data->updateSize = SDL_TRUE;
+    }
+}
+
+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 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_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;
+
+    GL_ActivateRenderer(renderer);
+
+    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->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_LINEAR);
+    renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,
+                                GL_LINEAR);
+    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 void
+SetupTextureUpdate(GL_RenderData * renderdata, SDL_Texture * texture,
+                   int pitch)
+{
+    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_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                 const SDL_Rect * rect, const void *pixels, int pitch)
+{
+    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
+    GL_TextureData *data = (GL_TextureData *) texture->driverdata;
+    GLenum result;
+
+    GL_ActivateRenderer(renderer);
+
+    renderdata->glGetError();
+    SetupTextureUpdate(renderdata, texture, pitch);
+    renderdata->glEnable(data->type);
+    renderdata->glBindTexture(data->type, data->texture);
+    renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
+                                rect->h, data->format, data->formattype,
+                                pixels);
+    renderdata->glDisable(data->type);
+    result = renderdata->glGetError();
+    if (result != GL_NO_ERROR) {
+        GL_SetError("glTexSubImage2D()", result);
+        return -1;
+    }
+    return 0;
+}
+
+static int
+GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+               const SDL_Rect * rect, int markDirty, void **pixels,
+               int *pitch)
+{
+    GL_TextureData *data = (GL_TextureData *) texture->driverdata;
+
+    if (markDirty) {
+        SDL_AddDirtyRect(&data->dirty, rect);
+    }
+
+    *pixels =
+        (void *) ((Uint8 *) data->pixels + rect->y * data->pitch +
+                  rect->x * bytes_per_pixel(texture->format));
+    *pitch = data->pitch;
+    return 0;
+}
+
+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)
+{
+    GL_TextureData *data = (GL_TextureData *) texture->driverdata;
+    int i;
+
+    for (i = 0; i < numrects; ++i) {
+        SDL_AddDirtyRect(&data->dirty, &rects[i]);
+    }
+}
+
+static void
+GL_SetBlendMode(GL_RenderData * data, int blendMode)
+{
+    if (blendMode != data->blendMode) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_NONE:
+            data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+            data->glDisable(GL_BLEND);
+            break;
+        case SDL_BLENDMODE_BLEND:
+            data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+            data->glEnable(GL_BLEND);
+            data->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+            break;
+        case SDL_BLENDMODE_ADD:
+            data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+            data->glEnable(GL_BLEND);
+            data->glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+            break;
+        }
+        data->blendMode = blendMode;
+    }
+}
+
+static int
+GL_RenderClear(SDL_Renderer * renderer)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+
+    GL_ActivateRenderer(renderer);
+
+    data->glClearColor((GLfloat) renderer->r * inv255f,
+                       (GLfloat) renderer->g * inv255f,
+                       (GLfloat) renderer->b * inv255f,
+                       (GLfloat) renderer->a * inv255f);
+
+    data->glClear(GL_COLOR_BUFFER_BIT);
+
+    return 0;
+}
+
+static int
+GL_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
+                    int count)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    int i;
+
+    GL_ActivateRenderer(renderer);
+
+    GL_SetBlendMode(data, renderer->blendMode);
+
+    data->glColor4f((GLfloat) renderer->r * inv255f,
+                    (GLfloat) renderer->g * inv255f,
+                    (GLfloat) renderer->b * inv255f,
+                    (GLfloat) renderer->a * inv255f);
+
+    data->glBegin(GL_POINTS);
+    for (i = 0; i < count; ++i) {
+        data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
+    }
+    data->glEnd();
+
+    return 0;
+}
+
+static int
+GL_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
+                   int count)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    int i;
+
+    GL_ActivateRenderer(renderer);
+
+    GL_SetBlendMode(data, renderer->blendMode);
+
+    data->glColor4f((GLfloat) renderer->r * inv255f,
+                    (GLfloat) renderer->g * inv255f,
+                    (GLfloat) renderer->b * inv255f,
+                    (GLfloat) renderer->a * inv255f);
+
+    if (count > 2 && 
+        points[0].x == points[count-1].x && points[0].y == points[count-1].y) {
+        data->glBegin(GL_LINE_LOOP);
+        /* GL_LINE_LOOP takes care of the final segment */
+        --count;
+        for (i = 0; i < count; ++i) {
+            data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
+        }
+        data->glEnd();
+    } else {
+#if defined(__APPLE__) || defined(__WIN32__)
+#else
+        int x1, y1, x2, y2;
+#endif
+
+        data->glBegin(GL_LINE_STRIP);
+        for (i = 0; i < count; ++i) {
+            data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
+        }
+        data->glEnd();
+
+        /* The line is half open, so we need one more point to complete it.
+         * http://www.opengl.org/documentation/specs/version1.1/glspec1.1/node47.html
+         * If we have to, we can use vertical line and horizontal line textures
+         * for vertical and horizontal lines, and then create custom textures
+         * for diagonal lines and software render those.  It's terrible, but at
+         * least it would be pixel perfect.
+         */
+        data->glBegin(GL_POINTS);
+#if defined(__APPLE__) || defined(__WIN32__)
+        /* Mac OS X and Windows seem to always leave the second point open */
+        data->glVertex2f(0.5f + points[count-1].x, 0.5f + points[count-1].y);
+#else
+        /* Linux seems to leave the right-most or bottom-most point open */
+        x1 = points[0].x;
+        y1 = points[0].y;
+        x2 = points[count-1].x;
+        y2 = points[count-1].y;
+
+        if (x1 > x2) {
+            data->glVertex2f(0.5f + x1, 0.5f + y1);
+        } else if (x2 > x1) {
+            data->glVertex2f(0.5f + x2, 0.5f + y2);
+        } else if (y1 > y2) {
+            data->glVertex2f(0.5f + x1, 0.5f + y1);
+        } else if (y2 > y1) {
+            data->glVertex2f(0.5f + x2, 0.5f + y2);
+        }
+#endif
+        data->glEnd();
+    }
+
+    return 0;
+}
+
+static int
+GL_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects, int count)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    int i;
+
+    GL_ActivateRenderer(renderer);
+
+    GL_SetBlendMode(data, renderer->blendMode);
+
+    data->glColor4f((GLfloat) renderer->r * inv255f,
+                    (GLfloat) renderer->g * inv255f,
+                    (GLfloat) renderer->b * inv255f,
+                    (GLfloat) renderer->a * inv255f);
+
+    for (i = 0; i < count; ++i) {
+        const SDL_Rect *rect = rects[i];
+
+        data->glRecti(rect->x, rect->y, rect->x + rect->w, rect->y + rect->h);
+    }
+
+    return 0;
+}
+
+static int
+GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
+              const SDL_Rect * srcrect, const SDL_Rect * dstrect)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;
+    int minx, miny, maxx, maxy;
+    GLfloat minu, maxu, minv, maxv;
+
+    GL_ActivateRenderer(renderer);
+
+    if (texturedata->dirty.list) {
+        SDL_DirtyRect *dirty;
+        void *pixels;
+        int bpp = bytes_per_pixel(texture->format);
+        int pitch = texturedata->pitch;
+
+        SetupTextureUpdate(data, texture, pitch);
+        data->glEnable(texturedata->type);
+        data->glBindTexture(texturedata->type, texturedata->texture);
+        for (dirty = texturedata->dirty.list; dirty; dirty = dirty->next) {
+            SDL_Rect *rect = &dirty->rect;
+            pixels =
+                (void *) ((Uint8 *) texturedata->pixels + rect->y * pitch +
+                          rect->x * bpp);
+            data->glTexSubImage2D(texturedata->type, 0, rect->x, rect->y,
+                                  rect->w / texturedata->HACK_RYAN_FIXME,
+                                  rect->h, texturedata->format,
+                                  texturedata->formattype, pixels);
+        }
+        SDL_ClearDirtyRects(&texturedata->dirty);
+    }
+
+    minx = dstrect->x;
+    miny = dstrect->y;
+    maxx = dstrect->x + dstrect->w;
+    maxy = dstrect->y + dstrect->h;
+
+    minu = (GLfloat) srcrect->x / texture->w;
+    minu *= texturedata->texw;
+    maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;
+    maxu *= texturedata->texw;
+    minv = (GLfloat) srcrect->y / texture->h;
+    minv *= texturedata->texh;
+    maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;
+    maxv *= texturedata->texh;
+
+    data->glEnable(texturedata->type);
+    data->glBindTexture(texturedata->type, texturedata->texture);
+
+    if (texture->modMode) {
+        data->glColor4f((GLfloat) texture->r * inv255f,
+                        (GLfloat) texture->g * inv255f,
+                        (GLfloat) texture->b * inv255f,
+                        (GLfloat) texture->a * inv255f);
+    } else {
+        data->glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
+    }
+
+    GL_SetBlendMode(data, texture->blendMode);
+
+    /* Set up the shader for the copy, if any */
+    if (texturedata->shader) {
+        data->glEnable(GL_FRAGMENT_PROGRAM_ARB);
+        data->glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, texturedata->shader);
+    }
+
+    data->glBegin(GL_TRIANGLE_STRIP);
+    data->glTexCoord2f(minu, minv);
+    data->glVertex2f((GLfloat) minx, (GLfloat) miny);
+    data->glTexCoord2f(maxu, minv);
+    data->glVertex2f((GLfloat) maxx, (GLfloat) miny);
+    data->glTexCoord2f(minu, maxv);
+    data->glVertex2f((GLfloat) minx, (GLfloat) maxy);
+    data->glTexCoord2f(maxu, maxv);
+    data->glVertex2f((GLfloat) maxx, (GLfloat) maxy);
+    data->glEnd();
+
+    if (texturedata->shader) {
+        data->glDisable(GL_FRAGMENT_PROGRAM_ARB);
+    }
+
+    data->glDisable(texturedata->type);
+
+    return 0;
+}
+
+static int
+GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
+                    Uint32 pixel_format, void * pixels, int pitch)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    SDL_Window *window = renderer->window;
+    GLint internalFormat;
+    GLenum format, type;
+    Uint8 *src, *dst, *tmp;
+    int w, h, length, rows;
+
+    GL_ActivateRenderer(renderer);
+
+    if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
+        /* FIXME: Do a temp copy to a format that is supported */
+        SDL_SetError("Unsupported pixel format");
+        return -1;
+    }
+
+    SDL_GetWindowSize(window, &w, &h);
+
+    data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
+    data->glPixelStorei(GL_PACK_ROW_LENGTH,
+                        (pitch / bytes_per_pixel(pixel_format)));
+
+    data->glReadPixels(rect->x, (h-rect->y)-rect->h, rect->w, rect->h,
+                       format, type, pixels);
+
+    /* Flip the rows to be top-down */
+    length = rect->w * bytes_per_pixel(pixel_format);
+    src = (Uint8*)pixels + (rect->h-1)*pitch;
+    dst = (Uint8*)pixels;
+    tmp = SDL_stack_alloc(Uint8, length);
+    rows = rect->h / 2;
+    while (rows--) {
+        SDL_memcpy(tmp, dst, length);
+        SDL_memcpy(dst, src, length);
+        SDL_memcpy(src, tmp, length);
+        dst += pitch;
+        src -= pitch;
+    }
+    SDL_stack_free(tmp);
+
+    return 0;
+}
+
+static int
+GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
+                     Uint32 pixel_format, const void * pixels, int pitch)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+    SDL_Window *window = renderer->window;
+    GLint internalFormat;
+    GLenum format, type;
+    Uint8 *src, *dst, *tmp;
+    int w, h, length, rows;
+
+    GL_ActivateRenderer(renderer);
+
+    if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
+        /* FIXME: Do a temp copy to a format that is supported */
+        SDL_SetError("Unsupported pixel format");
+        return -1;
+    }
+
+    SDL_GetWindowSize(window, &w, &h);
+
+    data->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    data->glPixelStorei(GL_UNPACK_ROW_LENGTH,
+                        (pitch / bytes_per_pixel(pixel_format)));
+
+    /* Flip the rows to be bottom-up */
+    length = rect->h * rect->w * pitch;
+    tmp = SDL_stack_alloc(Uint8, length);
+    src = (Uint8*)pixels + (rect->h-1)*pitch;
+    dst = (Uint8*)tmp;
+    rows = rect->h;
+    while (rows--) {
+        SDL_memcpy(dst, src, pitch);
+        dst += pitch;
+        src -= pitch;
+    }
+
+    data->glRasterPos2i(rect->x, (h-rect->y));
+    data->glDrawPixels(rect->w, rect->h, format, type, tmp);
+    SDL_stack_free(tmp);
+
+    return 0;
+}
+
+static void
+GL_RenderPresent(SDL_Renderer * renderer)
+{
+    GL_ActivateRenderer(renderer);
+
+    SDL_GL_SwapWindow(renderer->window);
+}
+
+static void
+GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
+    GL_TextureData *data = (GL_TextureData *) texture->driverdata;
+
+    GL_ActivateRenderer(renderer);
+
+    if (!data) {
+        return;
+    }
+    if (data->texture) {
+        renderdata->glDeleteTextures(1, &data->texture);
+    }
+    if (data->palette) {
+        SDL_free(data->palette);
+    }
+    if (data->pixels) {
+        SDL_free(data->pixels);
+    }
+    SDL_FreeDirtyRects(&data->dirty);
+    SDL_free(data);
+    texture->driverdata = NULL;
+}
+
+static void
+GL_DestroyRenderer(SDL_Renderer * renderer)
+{
+    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
+
+    if (data) {
+        if (data->context) {
+            if (data->GL_ARB_fragment_program_supported) {
+                data->glDisable(GL_FRAGMENT_PROGRAM_ARB);
+                data->glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 0);
+                if (data->fragment_program_UYVY &&
+                    data->fragment_program_UYVY != ~0) {
+                    data->glDeleteProgramsARB(1,
+                                              &data->fragment_program_UYVY);
+                }
+            }
+
+            /* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */
+            SDL_GL_DeleteContext(data->context);
+        }
+        SDL_free(data);
+    }
+    SDL_free(renderer);
+}
+
+#endif /* SDL_VIDEO_RENDER_OGL */
+
+/* vi: set ts=4 sw=4 expandtab: */