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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ppapi/lib/gl/gles2/gl2ext_ppapi.h"
      6 
      7 #include <stddef.h>
      8 
      9 #ifndef GL_FALSE
     10 #define GL_FALSE 0
     11 #endif  // GL_FALSE
     12 
     13 #ifndef GL_TRUE
     14 #define GL_TRUE 1
     15 #endif  // GL_TRUE
     16 
     17 #if defined(__GNUC__) && !defined(__APPLE__) && !defined(ANDROID)
     18 #define PP_TLS __thread
     19 #elif defined(_MSC_VER)
     20 #define PP_TLS __declspec(thread)
     21 #else
     22 // TODO(alokp): Fix all other platforms.
     23 #define PP_TLS
     24 #endif
     25 
     26 // TODO(alokp): This will need to be thread-safe if we build gles2 as a
     27 // shared library.
     28 static const struct PPB_OpenGLES2* g_gles2_interface = NULL;
     29 static const struct PPB_OpenGLES2InstancedArrays*
     30     g_gles2_instanced_arrays_interface = NULL;
     31 static const struct PPB_OpenGLES2FramebufferBlit*
     32     g_gles2_framebuffer_blit_interface = NULL;
     33 static const struct PPB_OpenGLES2FramebufferMultisample*
     34     g_gles2_framebuffer_multisample_interface = NULL;
     35 static const struct PPB_OpenGLES2ChromiumEnableFeature*
     36     g_gles2_chromium_enable_feature_interface = NULL;
     37 static const struct PPB_OpenGLES2ChromiumMapSub*
     38     g_gles2_chromium_map_sub_interface = NULL;
     39 static const struct PPB_OpenGLES2Query*
     40     g_gles2_query_interface = NULL;
     41 
     42 // TODO(alokp): Make sure PP_TLS works on all supported platforms.
     43 static PP_TLS PP_Resource g_current_context = 0;
     44 
     45 GLboolean GL_APIENTRY glInitializePPAPI(
     46     PPB_GetInterface get_browser_interface) {
     47   if (!g_gles2_interface) {
     48     g_gles2_interface = get_browser_interface(PPB_OPENGLES2_INTERFACE);
     49   }
     50   if (!g_gles2_instanced_arrays_interface) {
     51     g_gles2_instanced_arrays_interface =
     52         get_browser_interface(PPB_OPENGLES2_INSTANCEDARRAYS_INTERFACE);
     53   }
     54   if (!g_gles2_framebuffer_blit_interface) {
     55     g_gles2_framebuffer_blit_interface =
     56         get_browser_interface(PPB_OPENGLES2_FRAMEBUFFERBLIT_INTERFACE);
     57   }
     58   if (!g_gles2_framebuffer_multisample_interface) {
     59     g_gles2_framebuffer_multisample_interface =
     60         get_browser_interface(
     61             PPB_OPENGLES2_FRAMEBUFFERMULTISAMPLE_INTERFACE);
     62   }
     63   if (!g_gles2_chromium_enable_feature_interface) {
     64     g_gles2_chromium_enable_feature_interface =
     65         get_browser_interface(
     66             PPB_OPENGLES2_CHROMIUMENABLEFEATURE_INTERFACE);
     67   }
     68   if (!g_gles2_chromium_map_sub_interface) {
     69     g_gles2_chromium_map_sub_interface =
     70         get_browser_interface(PPB_OPENGLES2_CHROMIUMMAPSUB_INTERFACE);
     71   }
     72   if (!g_gles2_query_interface) {
     73     g_gles2_query_interface =
     74         get_browser_interface(PPB_OPENGLES2_QUERY_INTERFACE);
     75   }
     76   return g_gles2_interface ? GL_TRUE : GL_FALSE;
     77 }
     78 
     79 GLboolean GL_APIENTRY glTerminatePPAPI(void) {
     80   g_gles2_interface = NULL;
     81   return GL_TRUE;
     82 }
     83 
     84 void GL_APIENTRY glSetCurrentContextPPAPI(PP_Resource context) {
     85   g_current_context = context;
     86 }
     87 
     88 PP_Resource GL_APIENTRY glGetCurrentContextPPAPI(void) {
     89   return g_current_context;
     90 }
     91 
     92 const struct PPB_OpenGLES2* GL_APIENTRY glGetInterfacePPAPI(void) {
     93   return g_gles2_interface;
     94 }
     95 
     96 const struct PPB_OpenGLES2InstancedArrays* GL_APIENTRY
     97     glGetInstancedArraysInterfacePPAPI(void) {
     98   return g_gles2_instanced_arrays_interface;
     99 }
    100 
    101 const struct PPB_OpenGLES2FramebufferBlit* GL_APIENTRY
    102     glGetFramebufferBlitInterfacePPAPI(void) {
    103   return g_gles2_framebuffer_blit_interface;
    104 }
    105 
    106 const struct PPB_OpenGLES2FramebufferMultisample* GL_APIENTRY
    107     glGetFramebufferMultisampleInterfacePPAPI(void) {
    108   return g_gles2_framebuffer_multisample_interface;
    109 }
    110 
    111 const struct PPB_OpenGLES2ChromiumEnableFeature* GL_APIENTRY
    112     glGetChromiumEnableFeatureInterfacePPAPI(void) {
    113   return g_gles2_chromium_enable_feature_interface;
    114 }
    115 
    116 const struct PPB_OpenGLES2ChromiumMapSub* GL_APIENTRY
    117     glGetChromiumMapSubInterfacePPAPI(void) {
    118   return g_gles2_chromium_map_sub_interface;
    119 }
    120 
    121 const struct PPB_OpenGLES2Query* GL_APIENTRY
    122     glGetQueryInterfacePPAPI(void) {
    123   return g_gles2_query_interface;
    124 }
    125