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SDL_naclopengles.c (5134B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 #include "../../SDL_internal.h"
     22 
     23 #if SDL_VIDEO_DRIVER_NACL
     24 
     25 /* NaCl SDL video GLES 2 driver implementation */
     26 
     27 #include "SDL_video.h"
     28 #include "SDL_naclvideo.h"
     29 
     30 #if SDL_LOADSO_DLOPEN
     31 #include "dlfcn.h"
     32 #endif
     33 
     34 #include "ppapi/gles2/gl2ext_ppapi.h"
     35 #include "ppapi_simple/ps.h"
     36 
     37 /* GL functions */
     38 int
     39 NACL_GLES_LoadLibrary(_THIS, const char *path)
     40 {
     41     /* FIXME: Support dynamic linking when PNACL supports it */
     42     return glInitializePPAPI(PSGetInterface) == 0;
     43 }
     44 
     45 void *
     46 NACL_GLES_GetProcAddress(_THIS, const char *proc)
     47 {
     48 #if SDL_LOADSO_DLOPEN
     49     return dlsym( 0 /* RTLD_DEFAULT */, proc);
     50 #else
     51     return NULL;
     52 #endif
     53 }
     54 
     55 void
     56 NACL_GLES_UnloadLibrary(_THIS)
     57 {
     58     /* FIXME: Support dynamic linking when PNACL supports it */
     59     glTerminatePPAPI();
     60 }
     61 
     62 int
     63 NACL_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext sdl_context)
     64 {
     65     SDL_VideoData *driverdata = (SDL_VideoData *) _this->driverdata;
     66     /* FIXME: Check threading issues...otherwise use a hardcoded _this->context across all threads */
     67     driverdata->ppb_instance->BindGraphics(driverdata->instance, (PP_Resource) sdl_context);
     68     glSetCurrentContextPPAPI((PP_Resource) sdl_context);
     69     return 0;
     70 }
     71 
     72 SDL_GLContext
     73 NACL_GLES_CreateContext(_THIS, SDL_Window * window)
     74 {
     75     SDL_VideoData *driverdata = (SDL_VideoData *) _this->driverdata;
     76     PP_Resource context, share_context = 0;
     77     /* 64 seems nice. */
     78     Sint32 attribs[64];
     79     int i = 0;
     80     
     81     if (_this->gl_config.share_with_current_context) {
     82         share_context = (PP_Resource) SDL_GL_GetCurrentContext();
     83     }
     84 
     85     /* FIXME: Some ATTRIBS from PP_Graphics3DAttrib are not set here */
     86     
     87     attribs[i++] = PP_GRAPHICS3DATTRIB_WIDTH;
     88     attribs[i++] = window->w;
     89     attribs[i++] = PP_GRAPHICS3DATTRIB_HEIGHT;
     90     attribs[i++] = window->h;
     91     attribs[i++] = PP_GRAPHICS3DATTRIB_RED_SIZE;
     92     attribs[i++] = _this->gl_config.red_size;
     93     attribs[i++] = PP_GRAPHICS3DATTRIB_GREEN_SIZE;
     94     attribs[i++] = _this->gl_config.green_size;
     95     attribs[i++] = PP_GRAPHICS3DATTRIB_BLUE_SIZE;
     96     attribs[i++] = _this->gl_config.blue_size;
     97     
     98     if (_this->gl_config.alpha_size) {
     99         attribs[i++] = PP_GRAPHICS3DATTRIB_ALPHA_SIZE;
    100         attribs[i++] = _this->gl_config.alpha_size;
    101     }
    102     
    103     /*if (_this->gl_config.buffer_size) {
    104         attribs[i++] = EGL_BUFFER_SIZE;
    105         attribs[i++] = _this->gl_config.buffer_size;
    106     }*/
    107     
    108     attribs[i++] = PP_GRAPHICS3DATTRIB_DEPTH_SIZE;
    109     attribs[i++] = _this->gl_config.depth_size;
    110     
    111     if (_this->gl_config.stencil_size) {
    112         attribs[i++] = PP_GRAPHICS3DATTRIB_STENCIL_SIZE;
    113         attribs[i++] = _this->gl_config.stencil_size;
    114     }
    115     
    116     if (_this->gl_config.multisamplebuffers) {
    117         attribs[i++] = PP_GRAPHICS3DATTRIB_SAMPLE_BUFFERS;
    118         attribs[i++] = _this->gl_config.multisamplebuffers;
    119     }
    120     
    121     if (_this->gl_config.multisamplesamples) {
    122         attribs[i++] = PP_GRAPHICS3DATTRIB_SAMPLES;
    123         attribs[i++] = _this->gl_config.multisamplesamples;
    124     }
    125        
    126     attribs[i++] = PP_GRAPHICS3DATTRIB_NONE;
    127     
    128     context = driverdata->ppb_graphics->Create(driverdata->instance, share_context, attribs);
    129 
    130     if (context) {
    131         /* We need to make the context current, otherwise nothing works */
    132         SDL_GL_MakeCurrent(window, (SDL_GLContext) context);
    133     }
    134     
    135     return (SDL_GLContext) context;
    136 }
    137 
    138 
    139 
    140 int
    141 NACL_GLES_SetSwapInterval(_THIS, int interval)
    142 {
    143     /* STUB */
    144     return SDL_Unsupported();
    145 }
    146 
    147 int
    148 NACL_GLES_GetSwapInterval(_THIS)
    149 {
    150     /* STUB */
    151     return 0;
    152 }
    153 
    154 int
    155 NACL_GLES_SwapWindow(_THIS, SDL_Window * window)
    156 {
    157     SDL_VideoData *driverdata = (SDL_VideoData *) _this->driverdata;
    158     struct PP_CompletionCallback callback = { NULL, 0, PP_COMPLETIONCALLBACK_FLAG_NONE };
    159     if (driverdata->ppb_graphics->SwapBuffers((PP_Resource) SDL_GL_GetCurrentContext(), callback ) != 0) {
    160         return SDL_SetError("SwapBuffers failed");
    161     }
    162     return 0;
    163 }
    164 
    165 void
    166 NACL_GLES_DeleteContext(_THIS, SDL_GLContext context)
    167 {
    168     SDL_VideoData *driverdata = (SDL_VideoData *) _this->driverdata;
    169     driverdata->ppb_core->ReleaseResource((PP_Resource) context);
    170 }
    171 
    172 #endif /* SDL_VIDEO_DRIVER_NACL */
    173 
    174 /* vi: set ts=4 sw=4 expandtab: */