src/video/SDL_renderer_gles.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 24 Jan 2010 21:10:53 +0000
changeset 3697 f7b03b6838cb
parent 3688 6512cba48440
child 4525 3abf0b9cafad
permissions -rw-r--r--
Fixed bug #926

Updated copyright to LGPL version 2.1 and year 2010
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2010 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 #if SDL_VIDEO_RENDER_OGL_ES
    25 
    26 #include "SDL_video.h"
    27 #include "SDL_opengles.h"
    28 #include "SDL_sysvideo.h"
    29 #include "SDL_pixels_c.h"
    30 #include "SDL_rect_c.h"
    31 #include "SDL_yuv_sw_c.h"
    32 
    33 #if defined(__QNXNTO__)
    34 /* Include QNX system header to check QNX version later */
    35 #include <sys/neutrino.h>
    36 #endif /* __QNXNTO__ */
    37 
    38 #if defined(SDL_VIDEO_DRIVER_QNXGF)  ||  \
    39     defined(SDL_VIDEO_DRIVER_PHOTON) ||  \
    40     defined(SDL_VIDEO_DRIVER_PANDORA)
    41 
    42 /* Empty function stub to get OpenGL ES 1.x support without  */
    43 /* OpenGL ES extension GL_OES_draw_texture supported         */
    44 GL_API void GL_APIENTRY
    45 glDrawTexiOES(GLint x, GLint y, GLint z, GLint width, GLint height)
    46 {
    47     return;
    48 }
    49 
    50 #endif /* QNXGF || PHOTON || PANDORA */
    51 
    52 /* OpenGL ES 1.1 renderer implementation, based on the OpenGL renderer */
    53 
    54 static const float inv255f = 1.0f / 255.0f;
    55 
    56 static SDL_Renderer *GLES_CreateRenderer(SDL_Window * window, Uint32 flags);
    57 static int GLES_ActivateRenderer(SDL_Renderer * renderer);
    58 static int GLES_DisplayModeChanged(SDL_Renderer * renderer);
    59 static int GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
    60 static int GLES_QueryTexturePixels(SDL_Renderer * renderer,
    61                                    SDL_Texture * texture, void **pixels,
    62                                    int *pitch);
    63 static int GLES_SetTexturePalette(SDL_Renderer * renderer,
    64                                   SDL_Texture * texture,
    65                                   const SDL_Color * colors, int firstcolor,
    66                                   int ncolors);
    67 static int GLES_GetTexturePalette(SDL_Renderer * renderer,
    68                                   SDL_Texture * texture, SDL_Color * colors,
    69                                   int firstcolor, int ncolors);
    70 static int GLES_SetTextureColorMod(SDL_Renderer * renderer,
    71                                    SDL_Texture * texture);
    72 static int GLES_SetTextureAlphaMod(SDL_Renderer * renderer,
    73                                    SDL_Texture * texture);
    74 static int GLES_SetTextureBlendMode(SDL_Renderer * renderer,
    75                                     SDL_Texture * texture);
    76 static int GLES_SetTextureScaleMode(SDL_Renderer * renderer,
    77                                     SDL_Texture * texture);
    78 static int GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
    79                               const SDL_Rect * rect, const void *pixels,
    80                               int pitch);
    81 static int GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
    82                             const SDL_Rect * rect, int markDirty,
    83                             void **pixels, int *pitch);
    84 static void GLES_UnlockTexture(SDL_Renderer * renderer,
    85                                SDL_Texture * texture);
    86 static void GLES_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
    87                               int numrects, const SDL_Rect * rects);
    88 static int GLES_RenderDrawPoints(SDL_Renderer * renderer,
    89                                  const SDL_Point * points, int count);
    90 static int GLES_RenderDrawLines(SDL_Renderer * renderer,
    91                                 const SDL_Point * points, int count);
    92 static int GLES_RenderDrawRects(SDL_Renderer * renderer,
    93                                 const SDL_Rect ** rects, int count);
    94 static int GLES_RenderFillRects(SDL_Renderer * renderer,
    95                                 const SDL_Rect ** rects, int count);
    96 static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
    97                            const SDL_Rect * srcrect,
    98                            const SDL_Rect * dstrect);
    99 static void GLES_RenderPresent(SDL_Renderer * renderer);
   100 static void GLES_DestroyTexture(SDL_Renderer * renderer,
   101                                 SDL_Texture * texture);
   102 static void GLES_DestroyRenderer(SDL_Renderer * renderer);
   103 
   104 
   105 SDL_RenderDriver GL_ES_RenderDriver = {
   106     GLES_CreateRenderer,
   107     {
   108      "opengl_es",
   109      (SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTDISCARD |
   110       SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),
   111      (SDL_TEXTUREMODULATE_NONE | SDL_TEXTUREMODULATE_COLOR |
   112       SDL_TEXTUREMODULATE_ALPHA),
   113      (SDL_BLENDMODE_NONE | SDL_BLENDMODE_MASK |
   114       SDL_BLENDMODE_BLEND | SDL_BLENDMODE_ADD | SDL_BLENDMODE_MOD),
   115      (SDL_TEXTURESCALEMODE_NONE | SDL_TEXTURESCALEMODE_FAST |
   116       SDL_TEXTURESCALEMODE_SLOW), 5,
   117      {
   118       /* OpenGL ES 1.x supported formats list */
   119       SDL_PIXELFORMAT_ABGR4444,
   120       SDL_PIXELFORMAT_ABGR1555,
   121       SDL_PIXELFORMAT_BGR565,
   122       SDL_PIXELFORMAT_BGR24,
   123       SDL_PIXELFORMAT_ABGR8888},
   124      0,
   125      0}
   126 };
   127 
   128 typedef struct
   129 {
   130     SDL_GLContext context;
   131     SDL_bool updateSize;
   132     int blendMode;
   133 
   134 #ifndef APIENTRY
   135 #define APIENTRY
   136 #endif
   137 
   138     SDL_bool useDrawTexture;
   139     SDL_bool GL_OES_draw_texture_supported;
   140 
   141     /* OpenGL ES functions */
   142 #define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
   143 #include "SDL_glesfuncs.h"
   144 #undef SDL_PROC
   145 
   146 } GLES_RenderData;
   147 
   148 typedef struct
   149 {
   150     GLuint texture;
   151     GLenum type;
   152     GLfloat texw;
   153     GLfloat texh;
   154     GLenum format;
   155     GLenum formattype;
   156     void *pixels;
   157     int pitch;
   158     SDL_DirtyRectList dirty;
   159 } GLES_TextureData;
   160 
   161 static void
   162 GLES_SetError(const char *prefix, GLenum result)
   163 {
   164     const char *error;
   165 
   166     switch (result) {
   167     case GL_NO_ERROR:
   168         error = "GL_NO_ERROR";
   169         break;
   170     case GL_INVALID_ENUM:
   171         error = "GL_INVALID_ENUM";
   172         break;
   173     case GL_INVALID_VALUE:
   174         error = "GL_INVALID_VALUE";
   175         break;
   176     case GL_INVALID_OPERATION:
   177         error = "GL_INVALID_OPERATION";
   178         break;
   179     case GL_STACK_OVERFLOW:
   180         error = "GL_STACK_OVERFLOW";
   181         break;
   182     case GL_STACK_UNDERFLOW:
   183         error = "GL_STACK_UNDERFLOW";
   184         break;
   185     case GL_OUT_OF_MEMORY:
   186         error = "GL_OUT_OF_MEMORY";
   187         break;
   188     default:
   189         error = "UNKNOWN";
   190         break;
   191     }
   192     SDL_SetError("%s: %s", prefix, error);
   193 }
   194 
   195 static int
   196 GLES_LoadFunctions(GLES_RenderData * data)
   197 {
   198 
   199 #define SDL_PROC(ret,func,params) \
   200     data->func = func;
   201 #include "SDL_glesfuncs.h"
   202 #undef SDL_PROC
   203 
   204     return 0;
   205 }
   206 
   207 SDL_Renderer *
   208 GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
   209 {
   210 
   211     SDL_Renderer *renderer;
   212     GLES_RenderData *data;
   213     GLint value;
   214     int doublebuffer;
   215 
   216     if (!(window->flags & SDL_WINDOW_OPENGL)) {
   217         if (SDL_RecreateWindow(window, window->flags | SDL_WINDOW_OPENGL) < 0) {
   218             return NULL;
   219         }
   220     }
   221 
   222     renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
   223     if (!renderer) {
   224         SDL_OutOfMemory();
   225         return NULL;
   226     }
   227 
   228     data = (GLES_RenderData *) SDL_calloc(1, sizeof(*data));
   229     if (!data) {
   230         GLES_DestroyRenderer(renderer);
   231         SDL_OutOfMemory();
   232         return NULL;
   233     }
   234 
   235     renderer->ActivateRenderer = GLES_ActivateRenderer;
   236     renderer->DisplayModeChanged = GLES_DisplayModeChanged;
   237     renderer->CreateTexture = GLES_CreateTexture;
   238     renderer->QueryTexturePixels = GLES_QueryTexturePixels;
   239     renderer->SetTexturePalette = GLES_SetTexturePalette;
   240     renderer->GetTexturePalette = GLES_GetTexturePalette;
   241     renderer->SetTextureColorMod = GLES_SetTextureColorMod;
   242     renderer->SetTextureAlphaMod = GLES_SetTextureAlphaMod;
   243     renderer->SetTextureBlendMode = GLES_SetTextureBlendMode;
   244     renderer->SetTextureScaleMode = GLES_SetTextureScaleMode;
   245     renderer->UpdateTexture = GLES_UpdateTexture;
   246     renderer->LockTexture = GLES_LockTexture;
   247     renderer->UnlockTexture = GLES_UnlockTexture;
   248     renderer->DirtyTexture = GLES_DirtyTexture;
   249     renderer->RenderDrawPoints = GLES_RenderDrawPoints;
   250     renderer->RenderDrawLines = GLES_RenderDrawLines;
   251     renderer->RenderDrawRects = GLES_RenderDrawRects;
   252     renderer->RenderFillRects = GLES_RenderFillRects;
   253     renderer->RenderCopy = GLES_RenderCopy;
   254     renderer->RenderPresent = GLES_RenderPresent;
   255     renderer->DestroyTexture = GLES_DestroyTexture;
   256     renderer->DestroyRenderer = GLES_DestroyRenderer;
   257     renderer->info = GL_ES_RenderDriver.info;
   258     renderer->window = window;
   259     renderer->driverdata = data;
   260 
   261     renderer->info.flags =
   262         (SDL_RENDERER_PRESENTDISCARD | SDL_RENDERER_ACCELERATED);
   263 
   264 #if defined(__QNXNTO__)
   265 #if _NTO_VERSION<=641
   266     /* QNX's OpenGL ES implementation is broken regarding             */
   267     /* packed textures support, affected versions 6.3.2, 6.4.0, 6.4.1 */
   268     renderer->info.num_texture_formats = 2;
   269     renderer->info.texture_formats[0] = SDL_PIXELFORMAT_ABGR8888;
   270     renderer->info.texture_formats[1] = SDL_PIXELFORMAT_BGR24;
   271 #endif /* _NTO_VERSION */
   272 #endif /* __QNXNTO__ */
   273 
   274     if (GLES_LoadFunctions(data) < 0) {
   275         GLES_DestroyRenderer(renderer);
   276         return NULL;
   277     }
   278 
   279     data->context = SDL_GL_CreateContext(window);
   280     if (!data->context) {
   281         GLES_DestroyRenderer(renderer);
   282         return NULL;
   283     }
   284     if (SDL_GL_MakeCurrent(window, data->context) < 0) {
   285         GLES_DestroyRenderer(renderer);
   286         return NULL;
   287     }
   288 
   289     if (flags & SDL_RENDERER_PRESENTVSYNC) {
   290         SDL_GL_SetSwapInterval(1);
   291     } else {
   292         SDL_GL_SetSwapInterval(0);
   293     }
   294     if (SDL_GL_GetSwapInterval() > 0) {
   295         renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
   296     }
   297 
   298     if (SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &doublebuffer) == 0) {
   299         if (!doublebuffer) {
   300             renderer->info.flags |= SDL_RENDERER_SINGLEBUFFER;
   301         }
   302     }
   303 #if SDL_VIDEO_DRIVER_PANDORA
   304     data->GL_OES_draw_texture_supported = SDL_FALSE;
   305     data->useDrawTexture = SDL_FALSE;
   306 #else
   307     if (SDL_GL_ExtensionSupported("GL_OES_draw_texture")) {
   308         data->GL_OES_draw_texture_supported = SDL_TRUE;
   309         data->useDrawTexture = SDL_TRUE;
   310     } else {
   311         data->GL_OES_draw_texture_supported = SDL_FALSE;
   312         data->useDrawTexture = SDL_FALSE;
   313     }
   314 #endif
   315 
   316     data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
   317     renderer->info.max_texture_width = value;
   318     data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
   319     renderer->info.max_texture_height = value;
   320 
   321     /* Set up parameters for rendering */
   322     data->blendMode = -1;
   323     data->glDisable(GL_DEPTH_TEST);
   324     data->glDisable(GL_CULL_FACE);
   325     data->updateSize = SDL_TRUE;
   326 
   327     return renderer;
   328 }
   329 
   330 static int
   331 GLES_ActivateRenderer(SDL_Renderer * renderer)
   332 {
   333 
   334     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   335     SDL_Window *window = renderer->window;
   336 
   337     if (SDL_GL_MakeCurrent(window, data->context) < 0) {
   338         return -1;
   339     }
   340     if (data->updateSize) {
   341         data->glMatrixMode(GL_PROJECTION);
   342         data->glLoadIdentity();
   343         data->glMatrixMode(GL_MODELVIEW);
   344         data->glLoadIdentity();
   345         data->glViewport(0, 0, window->w, window->h);
   346         data->glOrthof(0.0, (GLfloat) window->w, (GLfloat) window->h, 0.0,
   347                        0.0, 1.0);
   348         data->updateSize = SDL_FALSE;
   349     }
   350     return 0;
   351 }
   352 
   353 static int
   354 GLES_DisplayModeChanged(SDL_Renderer * renderer)
   355 {
   356     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   357 
   358     data->updateSize = SDL_TRUE;
   359     return 0;
   360 }
   361 
   362 static __inline__ int
   363 power_of_2(int input)
   364 {
   365     int value = 1;
   366 
   367     while (value < input) {
   368         value <<= 1;
   369     }
   370     return value;
   371 }
   372 
   373 static int
   374 GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
   375 {
   376     GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
   377     GLES_TextureData *data;
   378     GLint internalFormat;
   379     GLenum format, type;
   380     int texture_w, texture_h;
   381     GLenum result;
   382 
   383     switch (texture->format) {
   384     case SDL_PIXELFORMAT_BGR24:
   385         internalFormat = GL_RGB;
   386         format = GL_RGB;
   387         type = GL_UNSIGNED_BYTE;
   388         break;
   389     case SDL_PIXELFORMAT_ABGR8888:
   390         internalFormat = GL_RGBA;
   391         format = GL_RGBA;
   392         type = GL_UNSIGNED_BYTE;
   393         break;
   394     case SDL_PIXELFORMAT_BGR565:
   395         internalFormat = GL_RGB;
   396         format = GL_RGB;
   397         type = GL_UNSIGNED_SHORT_5_6_5;
   398         break;
   399     case SDL_PIXELFORMAT_ABGR1555:
   400         internalFormat = GL_RGBA;
   401         format = GL_RGBA;
   402         type = GL_UNSIGNED_SHORT_5_5_5_1;
   403         break;
   404     case SDL_PIXELFORMAT_ABGR4444:
   405         internalFormat = GL_RGBA;
   406         format = GL_RGBA;
   407         type = GL_UNSIGNED_SHORT_4_4_4_4;
   408         break;
   409     default:
   410         SDL_SetError("Unsupported by OpenGL ES texture format");
   411         return -1;
   412     }
   413 
   414     data = (GLES_TextureData *) SDL_calloc(1, sizeof(*data));
   415     if (!data) {
   416         SDL_OutOfMemory();
   417         return -1;
   418     }
   419 
   420     if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
   421         data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
   422         data->pixels = SDL_malloc(texture->h * data->pitch);
   423         if (!data->pixels) {
   424             SDL_OutOfMemory();
   425             SDL_free(data);
   426             return -1;
   427         }
   428     }
   429 
   430     texture->driverdata = data;
   431 
   432     renderdata->glGetError();
   433     renderdata->glEnable(GL_TEXTURE_2D);
   434     renderdata->glGenTextures(1, &data->texture);
   435 
   436     data->type = GL_TEXTURE_2D;
   437     /* no NPOV textures allowed in OpenGL ES (yet) */
   438     texture_w = power_of_2(texture->w);
   439     texture_h = power_of_2(texture->h);
   440     data->texw = (GLfloat) texture->w / texture_w;
   441     data->texh = (GLfloat) texture->h / texture_h;
   442 
   443     data->format = format;
   444     data->formattype = type;
   445     renderdata->glBindTexture(data->type, data->texture);
   446     renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,
   447                                 GL_NEAREST);
   448     renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,
   449                                 GL_NEAREST);
   450     renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S,
   451                                 GL_CLAMP_TO_EDGE);
   452     renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T,
   453                                 GL_CLAMP_TO_EDGE);
   454 
   455     renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
   456                              texture_h, 0, format, type, NULL);
   457     renderdata->glDisable(GL_TEXTURE_2D);
   458 
   459     result = renderdata->glGetError();
   460     if (result != GL_NO_ERROR) {
   461         GLES_SetError("glTexImage2D()", result);
   462         return -1;
   463     }
   464     return 0;
   465 }
   466 
   467 static int
   468 GLES_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
   469                         void **pixels, int *pitch)
   470 {
   471     GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
   472 
   473     *pixels = data->pixels;
   474     *pitch = data->pitch;
   475     return 0;
   476 }
   477 
   478 static int
   479 GLES_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
   480                        const SDL_Color * colors, int firstcolor, int ncolors)
   481 {
   482     SDL_SetError("OpenGL ES does not support paletted textures");
   483     return -1;
   484 }
   485 
   486 static int
   487 GLES_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
   488                        SDL_Color * colors, int firstcolor, int ncolors)
   489 {
   490     SDL_SetError("OpenGL ES does not support paletted textures");
   491     return -1;
   492 }
   493 
   494 static void
   495 SetupTextureUpdate(GLES_RenderData * renderdata, SDL_Texture * texture,
   496                    int pitch)
   497 {
   498     GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
   499     renderdata->glBindTexture(data->type, data->texture);
   500     renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
   501 }
   502 
   503 static int
   504 GLES_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
   505 {
   506     return 0;
   507 }
   508 
   509 static int
   510 GLES_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
   511 {
   512     return 0;
   513 }
   514 
   515 static int
   516 GLES_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
   517 {
   518     switch (texture->blendMode) {
   519     case SDL_BLENDMODE_NONE:
   520     case SDL_BLENDMODE_MASK:
   521     case SDL_BLENDMODE_BLEND:
   522     case SDL_BLENDMODE_ADD:
   523     case SDL_BLENDMODE_MOD:
   524         return 0;
   525     default:
   526         SDL_Unsupported();
   527         texture->blendMode = SDL_BLENDMODE_NONE;
   528         return -1;
   529     }
   530 }
   531 
   532 static int
   533 GLES_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture)
   534 {
   535     switch (texture->scaleMode) {
   536     case SDL_TEXTURESCALEMODE_NONE:
   537     case SDL_TEXTURESCALEMODE_FAST:
   538     case SDL_TEXTURESCALEMODE_SLOW:
   539         return 0;
   540     case SDL_TEXTURESCALEMODE_BEST:
   541         SDL_Unsupported();
   542         texture->scaleMode = SDL_TEXTURESCALEMODE_SLOW;
   543         return -1;
   544     default:
   545         SDL_Unsupported();
   546         texture->scaleMode = SDL_TEXTURESCALEMODE_NONE;
   547         return -1;
   548     }
   549 }
   550 
   551 static int
   552 GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
   553                    const SDL_Rect * rect, const void *pixels, int pitch)
   554 {
   555     GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
   556     GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
   557     GLenum result;
   558 
   559     renderdata->glGetError();
   560     renderdata->glEnable(data->type);
   561     SetupTextureUpdate(renderdata, texture, pitch);
   562     renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
   563                                 rect->h, data->format, data->formattype,
   564                                 pixels);
   565     renderdata->glDisable(data->type);
   566     result = renderdata->glGetError();
   567     if (result != GL_NO_ERROR) {
   568         GLES_SetError("glTexSubImage2D()", result);
   569         return -1;
   570     }
   571     return 0;
   572 }
   573 
   574 static int
   575 GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
   576                  const SDL_Rect * rect, int markDirty, void **pixels,
   577                  int *pitch)
   578 {
   579     GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
   580 
   581     if (markDirty) {
   582         SDL_AddDirtyRect(&data->dirty, rect);
   583     }
   584 
   585     *pixels =
   586         (void *) ((Uint8 *) data->pixels + rect->y * data->pitch +
   587                   rect->x * SDL_BYTESPERPIXEL(texture->format));
   588     *pitch = data->pitch;
   589     return 0;
   590 }
   591 
   592 static void
   593 GLES_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
   594 {
   595 }
   596 
   597 static void
   598 GLES_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
   599                   int numrects, const SDL_Rect * rects)
   600 {
   601     GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
   602     int i;
   603 
   604     for (i = 0; i < numrects; ++i) {
   605         SDL_AddDirtyRect(&data->dirty, &rects[i]);
   606     }
   607 }
   608 
   609 static void
   610 GLES_SetBlendMode(GLES_RenderData * data, int blendMode, int isprimitive)
   611 {
   612     if (blendMode != data->blendMode) {
   613         switch (blendMode) {
   614         case SDL_BLENDMODE_NONE:
   615             data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
   616             data->glDisable(GL_BLEND);
   617             break;
   618         case SDL_BLENDMODE_MASK:
   619             if (isprimitive) {
   620                 data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
   621                 data->glDisable(GL_BLEND);
   622                 /* The same as SDL_BLENDMODE_NONE */
   623                 blendMode = SDL_BLENDMODE_NONE;
   624                 break;
   625             }
   626             /* fall through */
   627         case SDL_BLENDMODE_BLEND:
   628             data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
   629             data->glEnable(GL_BLEND);
   630             data->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   631             break;
   632         case SDL_BLENDMODE_ADD:
   633             data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
   634             data->glEnable(GL_BLEND);
   635             data->glBlendFunc(GL_SRC_ALPHA, GL_ONE);
   636             break;
   637         case SDL_BLENDMODE_MOD:
   638             data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
   639             data->glEnable(GL_BLEND);
   640             data->glBlendFunc(GL_ZERO, GL_SRC_COLOR);
   641             break;
   642         }
   643         data->blendMode = blendMode;
   644     }
   645 }
   646 
   647 static int
   648 GLES_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
   649                       int count)
   650 {
   651     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   652     int i;
   653     GLshort *vertices;
   654 
   655     GLES_SetBlendMode(data, renderer->blendMode, 1);
   656 
   657     data->glColor4f((GLfloat) renderer->r * inv255f,
   658                     (GLfloat) renderer->g * inv255f,
   659                     (GLfloat) renderer->b * inv255f,
   660                     (GLfloat) renderer->a * inv255f);
   661 
   662     vertices = SDL_stack_alloc(GLshort, count*2);
   663     for (i = 0; i < count; ++i) {
   664         vertices[2*i+0] = (GLshort)points[i].x;
   665         vertices[2*i+1] = (GLshort)points[i].y;
   666     }
   667     data->glVertexPointer(2, GL_SHORT, 0, vertices);
   668     data->glEnableClientState(GL_VERTEX_ARRAY);
   669     data->glDrawArrays(GL_POINTS, 0, count);
   670     data->glDisableClientState(GL_VERTEX_ARRAY);
   671     SDL_stack_free(vertices);
   672 
   673     return 0;
   674 }
   675 
   676 static int
   677 GLES_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
   678                      int count)
   679 {
   680     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   681     int i;
   682     GLshort *vertices;
   683 
   684     GLES_SetBlendMode(data, renderer->blendMode, 1);
   685 
   686     data->glColor4f((GLfloat) renderer->r * inv255f,
   687                     (GLfloat) renderer->g * inv255f,
   688                     (GLfloat) renderer->b * inv255f,
   689                     (GLfloat) renderer->a * inv255f);
   690 
   691     vertices = SDL_stack_alloc(GLshort, count*2);
   692     for (i = 0; i < count; ++i) {
   693         vertices[2*i+0] = (GLshort)points[i].x;
   694         vertices[2*i+1] = (GLshort)points[i].y;
   695     }
   696     data->glVertexPointer(2, GL_SHORT, 0, vertices);
   697     data->glEnableClientState(GL_VERTEX_ARRAY);
   698     if (count > 2 && 
   699         points[0].x == points[count-1].x && points[0].y == points[count-1].y) {
   700         /* GL_LINE_LOOP takes care of the final segment */
   701         --count;
   702         data->glDrawArrays(GL_LINE_LOOP, 0, count);
   703     } else {
   704         data->glDrawArrays(GL_LINE_STRIP, 0, count);
   705     }
   706     data->glDisableClientState(GL_VERTEX_ARRAY);
   707     SDL_stack_free(vertices);
   708 
   709     return 0;
   710 }
   711 
   712 static int
   713 GLES_RenderDrawRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
   714                      int count)
   715 {
   716     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   717     int i;
   718 
   719     GLES_SetBlendMode(data, renderer->blendMode, 1);
   720 
   721     data->glColor4f((GLfloat) renderer->r * inv255f,
   722                     (GLfloat) renderer->g * inv255f,
   723                     (GLfloat) renderer->b * inv255f,
   724                     (GLfloat) renderer->a * inv255f);
   725 
   726     data->glEnableClientState(GL_VERTEX_ARRAY);
   727     for (i = 0; i < count; ++i) {
   728         const SDL_Rect *rect = rects[i];
   729         GLshort minx = rect->x;
   730         GLshort maxx = rect->x + rect->w;
   731         GLshort miny = rect->y;
   732         GLshort maxy = rect->y + rect->h;
   733         GLshort vertices[8];
   734         vertices[0] = minx;
   735         vertices[1] = miny;
   736         vertices[2] = maxx;
   737         vertices[3] = miny;
   738         vertices[4] = minx;
   739         vertices[5] = maxy;
   740         vertices[6] = maxx;
   741         vertices[7] = maxy;
   742 
   743         data->glVertexPointer(2, GL_SHORT, 0, vertices);
   744         data->glDrawArrays(GL_LINE_LOOP, 0, 4);
   745     }
   746     data->glDisableClientState(GL_VERTEX_ARRAY);
   747 
   748     return 0;
   749 }
   750 
   751 static int
   752 GLES_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
   753                      int count)
   754 {
   755     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   756     int i;
   757 
   758     GLES_SetBlendMode(data, renderer->blendMode, 1);
   759 
   760     data->glColor4f((GLfloat) renderer->r * inv255f,
   761                     (GLfloat) renderer->g * inv255f,
   762                     (GLfloat) renderer->b * inv255f,
   763                     (GLfloat) renderer->a * inv255f);
   764 
   765     data->glEnableClientState(GL_VERTEX_ARRAY);
   766     for (i = 0; i < count; ++i) {
   767         const SDL_Rect *rect = rects[i];
   768         GLshort minx = rect->x;
   769         GLshort maxx = rect->x + rect->w;
   770         GLshort miny = rect->y;
   771         GLshort maxy = rect->y + rect->h;
   772         GLshort vertices[8];
   773         vertices[0] = minx;
   774         vertices[1] = miny;
   775         vertices[2] = maxx;
   776         vertices[3] = miny;
   777         vertices[4] = minx;
   778         vertices[5] = maxy;
   779         vertices[6] = maxx;
   780         vertices[7] = maxy;
   781 
   782         data->glVertexPointer(2, GL_SHORT, 0, vertices);
   783         data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
   784     }
   785     data->glDisableClientState(GL_VERTEX_ARRAY);
   786 
   787     return 0;
   788 }
   789 
   790 static int
   791 GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
   792                 const SDL_Rect * srcrect, const SDL_Rect * dstrect)
   793 {
   794 
   795     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   796     GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
   797     int minx, miny, maxx, maxy;
   798     GLfloat minu, maxu, minv, maxv;
   799     int i;
   800     void *temp_buffer;          /* used for reformatting dirty rect pixels */
   801     void *temp_ptr;
   802 
   803     data->glEnable(GL_TEXTURE_2D);
   804 
   805     if (texturedata->dirty.list) {
   806         SDL_DirtyRect *dirty;
   807         void *pixels;
   808         int bpp = SDL_BYTESPERPIXEL(texture->format);
   809         int pitch = texturedata->pitch;
   810 
   811         SetupTextureUpdate(data, texture, pitch);
   812 
   813         data->glBindTexture(texturedata->type, texturedata->texture);
   814         for (dirty = texturedata->dirty.list; dirty; dirty = dirty->next) {
   815             SDL_Rect *rect = &dirty->rect;
   816             pixels =
   817                 (void *) ((Uint8 *) texturedata->pixels + rect->y * pitch +
   818                           rect->x * bpp);
   819             /*      There is no GL_UNPACK_ROW_LENGTH in OpenGLES 
   820                we must do this reformatting ourselves(!)
   821 
   822                maybe it'd be a good idea to keep a temp buffer around
   823                for this purpose rather than allocating it each time
   824              */
   825             temp_buffer = SDL_malloc(rect->w * rect->h * bpp);
   826             temp_ptr = temp_buffer;
   827             for (i = 0; i < rect->h; i++) {
   828                 SDL_memcpy(temp_ptr, pixels, rect->w * bpp);
   829                 temp_ptr += rect->w * bpp;
   830                 pixels += pitch;
   831             }
   832 
   833             data->glTexSubImage2D(texturedata->type, 0, rect->x, rect->y,
   834                                   rect->w, rect->h, texturedata->format,
   835                                   texturedata->formattype, temp_buffer);
   836 
   837             SDL_free(temp_buffer);
   838 
   839         }
   840         SDL_ClearDirtyRects(&texturedata->dirty);
   841     }
   842 
   843     data->glBindTexture(texturedata->type, texturedata->texture);
   844 
   845     if (texture->modMode) {
   846         data->glColor4f((GLfloat) texture->r * inv255f,
   847                         (GLfloat) texture->g * inv255f,
   848                         (GLfloat) texture->b * inv255f,
   849                         (GLfloat) texture->a * inv255f);
   850     } else {
   851         data->glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
   852     }
   853 
   854     GLES_SetBlendMode(data, texture->blendMode, 0);
   855 
   856     switch (texture->scaleMode) {
   857     case SDL_TEXTURESCALEMODE_NONE:
   858     case SDL_TEXTURESCALEMODE_FAST:
   859         data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
   860                               GL_NEAREST);
   861         data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
   862                               GL_NEAREST);
   863         break;
   864     case SDL_TEXTURESCALEMODE_SLOW:
   865     case SDL_TEXTURESCALEMODE_BEST:
   866         data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
   867                               GL_LINEAR);
   868         data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
   869                               GL_LINEAR);
   870         break;
   871     }
   872 
   873     if (data->GL_OES_draw_texture_supported && data->useDrawTexture) {
   874         /* this code is a little funny because the viewport is upside down vs SDL's coordinate system */
   875         SDL_Window *window = renderer->window;
   876         GLint cropRect[4];
   877         cropRect[0] = srcrect->x;
   878         cropRect[1] = srcrect->y + srcrect->h;
   879         cropRect[2] = srcrect->w;
   880         cropRect[3] = -srcrect->h;
   881         data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
   882                                cropRect);
   883         data->glDrawTexiOES(dstrect->x, window->h - dstrect->y - dstrect->h,
   884                             0, dstrect->w, dstrect->h);
   885     } else {
   886 
   887         minx = dstrect->x;
   888         miny = dstrect->y;
   889         maxx = dstrect->x + dstrect->w;
   890         maxy = dstrect->y + dstrect->h;
   891 
   892         minu = (GLfloat) srcrect->x / texture->w;
   893         minu *= texturedata->texw;
   894         maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;
   895         maxu *= texturedata->texw;
   896         minv = (GLfloat) srcrect->y / texture->h;
   897         minv *= texturedata->texh;
   898         maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;
   899         maxv *= texturedata->texh;
   900 
   901         GLshort vertices[8];
   902         GLfloat texCoords[8];
   903 
   904         vertices[0] = minx;
   905         vertices[1] = miny;
   906         vertices[2] = maxx;
   907         vertices[3] = miny;
   908         vertices[4] = minx;
   909         vertices[5] = maxy;
   910         vertices[6] = maxx;
   911         vertices[7] = maxy;
   912 
   913         texCoords[0] = minu;
   914         texCoords[1] = minv;
   915         texCoords[2] = maxu;
   916         texCoords[3] = minv;
   917         texCoords[4] = minu;
   918         texCoords[5] = maxv;
   919         texCoords[6] = maxu;
   920         texCoords[7] = maxv;
   921 
   922         data->glVertexPointer(2, GL_SHORT, 0, vertices);
   923         data->glEnableClientState(GL_VERTEX_ARRAY);
   924         data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
   925         data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);
   926         data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
   927         data->glDisableClientState(GL_TEXTURE_COORD_ARRAY);
   928         data->glDisableClientState(GL_VERTEX_ARRAY);
   929     }
   930 
   931     data->glDisable(GL_TEXTURE_2D);
   932 
   933     return 0;
   934 }
   935 
   936 static void
   937 GLES_RenderPresent(SDL_Renderer * renderer)
   938 {
   939     SDL_GL_SwapWindow(renderer->window);
   940 }
   941 
   942 static void
   943 GLES_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
   944 {
   945     GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
   946 
   947     if (!data) {
   948         return;
   949     }
   950     if (data->texture) {
   951         glDeleteTextures(1, &data->texture);
   952     }
   953     if (data->pixels) {
   954         SDL_free(data->pixels);
   955     }
   956     SDL_FreeDirtyRects(&data->dirty);
   957     SDL_free(data);
   958     texture->driverdata = NULL;
   959 }
   960 
   961 static void
   962 GLES_DestroyRenderer(SDL_Renderer * renderer)
   963 {
   964     GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
   965 
   966     if (data) {
   967         if (data->context) {
   968             SDL_GL_DeleteContext(data->context);
   969         }
   970         SDL_free(data);
   971     }
   972     SDL_free(renderer);
   973 }
   974 
   975 #endif /* SDL_VIDEO_RENDER_OGL_ES */
   976 
   977 /* vi: set ts=4 sw=4 expandtab: */