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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 static const struct PPB_OpenGLES2VertexArrayObject*
     42     g_gles2_vertex_array_object_interface = NULL;
     43 static const struct PPB_OpenGLES2DrawBuffers_Dev*
     44     g_gles2_draw_buffers_interface = NULL;
     45 
     46 // TODO(alokp): Make sure PP_TLS works on all supported platforms.
     47 static PP_TLS PP_Resource g_current_context = 0;
     48 
     49 GLboolean GL_APIENTRY glInitializePPAPI(
     50     PPB_GetInterface get_browser_interface) {
     51   if (!g_gles2_interface) {
     52     g_gles2_interface = get_browser_interface(PPB_OPENGLES2_INTERFACE);
     53   }
     54   if (!g_gles2_instanced_arrays_interface) {
     55     g_gles2_instanced_arrays_interface =
     56         get_browser_interface(PPB_OPENGLES2_INSTANCEDARRAYS_INTERFACE);
     57   }
     58   if (!g_gles2_framebuffer_blit_interface) {
     59     g_gles2_framebuffer_blit_interface =
     60         get_browser_interface(PPB_OPENGLES2_FRAMEBUFFERBLIT_INTERFACE);
     61   }
     62   if (!g_gles2_framebuffer_multisample_interface) {
     63     g_gles2_framebuffer_multisample_interface =
     64         get_browser_interface(
     65             PPB_OPENGLES2_FRAMEBUFFERMULTISAMPLE_INTERFACE);
     66   }
     67   if (!g_gles2_chromium_enable_feature_interface) {
     68     g_gles2_chromium_enable_feature_interface =
     69         get_browser_interface(
     70             PPB_OPENGLES2_CHROMIUMENABLEFEATURE_INTERFACE);
     71   }
     72   if (!g_gles2_chromium_map_sub_interface) {
     73     g_gles2_chromium_map_sub_interface =
     74         get_browser_interface(PPB_OPENGLES2_CHROMIUMMAPSUB_INTERFACE);
     75   }
     76   if (!g_gles2_query_interface) {
     77     g_gles2_query_interface =
     78         get_browser_interface(PPB_OPENGLES2_QUERY_INTERFACE);
     79   }
     80   if (!g_gles2_vertex_array_object_interface) {
     81     g_gles2_vertex_array_object_interface =
     82         get_browser_interface(PPB_OPENGLES2_VERTEXARRAYOBJECT_INTERFACE);
     83   }
     84   if (!g_gles2_draw_buffers_interface) {
     85     g_gles2_draw_buffers_interface =
     86         get_browser_interface(PPB_OPENGLES2_DRAWBUFFERS_DEV_INTERFACE);
     87   }
     88   return g_gles2_interface ? GL_TRUE : GL_FALSE;
     89 }
     90 
     91 GLboolean GL_APIENTRY glTerminatePPAPI(void) {
     92   g_gles2_interface = NULL;
     93   return GL_TRUE;
     94 }
     95 
     96 void GL_APIENTRY glSetCurrentContextPPAPI(PP_Resource context) {
     97   g_current_context = context;
     98 }
     99 
    100 PP_Resource GL_APIENTRY glGetCurrentContextPPAPI(void) {
    101   return g_current_context;
    102 }
    103 
    104 const struct PPB_OpenGLES2* GL_APIENTRY glGetInterfacePPAPI(void) {
    105   return g_gles2_interface;
    106 }
    107 
    108 const struct PPB_OpenGLES2InstancedArrays* GL_APIENTRY
    109     glGetInstancedArraysInterfacePPAPI(void) {
    110   return g_gles2_instanced_arrays_interface;
    111 }
    112 
    113 const struct PPB_OpenGLES2FramebufferBlit* GL_APIENTRY
    114     glGetFramebufferBlitInterfacePPAPI(void) {
    115   return g_gles2_framebuffer_blit_interface;
    116 }
    117 
    118 const struct PPB_OpenGLES2FramebufferMultisample* GL_APIENTRY
    119     glGetFramebufferMultisampleInterfacePPAPI(void) {
    120   return g_gles2_framebuffer_multisample_interface;
    121 }
    122 
    123 const struct PPB_OpenGLES2ChromiumEnableFeature* GL_APIENTRY
    124     glGetChromiumEnableFeatureInterfacePPAPI(void) {
    125   return g_gles2_chromium_enable_feature_interface;
    126 }
    127 
    128 const struct PPB_OpenGLES2ChromiumMapSub* GL_APIENTRY
    129     glGetChromiumMapSubInterfacePPAPI(void) {
    130   return g_gles2_chromium_map_sub_interface;
    131 }
    132 
    133 const struct PPB_OpenGLES2Query* GL_APIENTRY
    134     glGetQueryInterfacePPAPI(void) {
    135   return g_gles2_query_interface;
    136 }
    137 
    138 const struct PPB_OpenGLES2VertexArrayObject* GL_APIENTRY
    139     glGetVertexArrayObjectInterfacePPAPI(void) {
    140   return g_gles2_vertex_array_object_interface;
    141 }
    142 
    143 const struct PPB_OpenGLES2DrawBuffers_Dev* GL_APIENTRY
    144     glGetDrawBuffersInterfacePPAPI(void) {
    145   return g_gles2_draw_buffers_interface;
    146 }
    147