1 /****************************************************************************** 2 3 @File OGLES2/PVRTgles2Ext.cpp 4 5 @Title OGLES2/PVRTgles2Ext 6 7 @Version 8 9 @Copyright Copyright (c) Imagination Technologies Limited. 10 11 @Platform Independent 12 13 @Description OpenGL ES 2.0 extensions 14 15 ******************************************************************************/ 16 #include <string.h> 17 18 #include "PVRTContext.h" 19 #include "PVRTgles2Ext.h" 20 21 /**************************************************************************** 22 ** Local code 23 ****************************************************************************/ 24 25 /**************************************************************************** 26 ** Class: CPVRTgles2Ext 27 ****************************************************************************/ 28 29 /*!*************************************************************************** 30 @Function LoadExtensions 31 @Description Initialises IMG extensions 32 *****************************************************************************/ 33 void CPVRTgles2Ext::LoadExtensions() 34 { 35 glMultiDrawElementsEXT = 0; 36 glMultiDrawArraysEXT = 0; 37 glMapBufferOES = 0; 38 glUnmapBufferOES = 0; 39 glGetBufferPointervOES = 0; 40 glDiscardFramebufferEXT = 0; 41 glBindVertexArrayOES = 0; 42 glDeleteVertexArraysOES = 0; 43 glGenVertexArraysOES = 0; 44 glIsVertexArrayOES = 0; 45 glRenderbufferStorageMultisampleIMG = 0; 46 glFramebufferTexture2DMultisampleIMG = 0; 47 glGenQueriesEXT = 0; 48 glDeleteQueriesEXT = 0; 49 glIsQueryEXT = 0; 50 glBeginQueryEXT = 0; 51 glEndQueryEXT = 0; 52 glGetQueryivEXT = 0; 53 glGetQueryObjectuivEXT = 0; 54 glRenderbufferStorageMultisampleANGLE = 0; 55 glBlitFramebufferNV = 0; 56 glTexImage3DOES = 0; 57 glTexSubImage3DOES = 0; 58 glCopyTexSubImage3DOES = 0; 59 glCompressedTexImage3DOES = 0; 60 glCompressedTexSubImage3DOES = 0; 61 glFramebufferTexture3DOES = 0; 62 glDrawBuffersEXT = 0; 63 64 // Supported extensions provide new entry points for OpenGL ES 2.0. 65 66 const GLubyte *pszGLExtensions; 67 68 /* Retrieve GL extension string */ 69 pszGLExtensions = glGetString(GL_EXTENSIONS); 70 71 #if !defined(TARGET_OS_IPHONE) 72 /* GL_EXT_multi_draw_arrays */ 73 if (strstr((char *)pszGLExtensions, "GL_EXT_multi_draw_arrays")) 74 { 75 glMultiDrawElementsEXT = (PFNGLMULTIDRAWELEMENTS) PVRGetProcAddress(glMultiDrawElementsEXT); 76 glMultiDrawArraysEXT = (PFNGLMULTIDRAWARRAYS) PVRGetProcAddress(glMultiDrawArraysEXT); 77 } 78 79 /* GL_EXT_multi_draw_arrays */ 80 if (strstr((char *)pszGLExtensions, "GL_OES_mapbuffer")) 81 { 82 glMapBufferOES = (PFNGLMAPBUFFEROES) PVRGetProcAddress(glMapBufferOES); 83 glUnmapBufferOES = (PFNGLUNMAPBUFFEROES) PVRGetProcAddress(glUnmapBufferOES); 84 glGetBufferPointervOES = (PFNGLGETBUFFERPOINTERVOES) PVRGetProcAddress(glGetBufferPointervOES); 85 } 86 87 /* GL_OES_vertex_array_object */ 88 if (strstr((char *)pszGLExtensions, "GL_OES_vertex_array_object")) 89 { 90 glBindVertexArrayOES = (PFNGLBINDVERTEXARRAYOES) PVRGetProcAddress(glBindVertexArrayOES); 91 glDeleteVertexArraysOES = (PFNGLDELETEVERTEXARRAYSOES) PVRGetProcAddress(glDeleteVertexArraysOES); 92 glGenVertexArraysOES = (PFNGLGENVERTEXARRAYSOES) PVRGetProcAddress(glGenVertexArraysOES); 93 glIsVertexArrayOES = (PFNGLISVERTEXARRAYOES) PVRGetProcAddress(glIsVertexArrayOES); 94 } 95 96 /* GL_IMG_multisampled_render_to_texture */ 97 if (strstr((char *)pszGLExtensions, "GL_IMG_multisampled_render_to_texture")) 98 { 99 glRenderbufferStorageMultisampleIMG = (PFNGLRENDERBUFFERSTORAGEMULTISAMPLEIMG) PVRGetProcAddress(glRenderbufferStorageMultisampleIMG); 100 glFramebufferTexture2DMultisampleIMG = (PFNGLFRAMEBUFFERTEXTURE2DMULTISAMPLEIMG) PVRGetProcAddress(glFramebufferTexture2DMultisampleIMG); 101 } 102 103 /* GL_ANGLE_framebuffer_multisample */ 104 if (strstr((char *)pszGLExtensions, "GL_ANGLE_framebuffer_multisample")) 105 { 106 glRenderbufferStorageMultisampleANGLE = (PFNGLRENDERBUFFERSTORAGEMULTISAMPLEANGLEPROC)PVRGetProcAddress(glRenderbufferStorageMultisampleANGLE); 107 } 108 109 /* GL_NV_framebuffer_blit */ 110 if (strstr((char *)pszGLExtensions, "GL_NV_framebuffer_blit")) 111 { 112 glBlitFramebufferNV = (PFNGLBLITFRAMEBUFFERNVPROC) PVRGetProcAddress(glBlitFramebufferNV); 113 } 114 115 /* GL_OES_texture_3D */ 116 if(strstr((char *)pszGLExtensions, "GL_OES_texture_3D")) 117 { 118 glTexImage3DOES = (PFNGLTEXIMAGE3DOES) PVRGetProcAddress(glTexImage3DOES); 119 glTexSubImage3DOES = (PFNGLTEXSUBIMAGE3DOES) PVRGetProcAddress(glTexSubImage3DOES); 120 glCopyTexSubImage3DOES = (PFNGLCOPYTEXSUBIMAGE3DOES) PVRGetProcAddress(glCopyTexSubImage3DOES); 121 glCompressedTexImage3DOES = (PFNGLCOMPRESSEDTEXIMAGE3DOES) PVRGetProcAddress(glCompressedTexImage3DOES); 122 glCompressedTexSubImage3DOES = (PFNGLCOMPRESSEDTEXSUBIMAGE3DOES) PVRGetProcAddress(glCompressedTexSubImage3DOES); 123 glFramebufferTexture3DOES = (PFNGLFRAMEBUFFERTEXTURE3DOES) PVRGetProcAddress(glFramebufferTexture3DOES); 124 } 125 126 /* GL_EXT_draw_buffers */ 127 if (strstr((char *)pszGLExtensions, "GL_EXT_draw_buffers")) 128 { 129 glDrawBuffersEXT = (PFNGLDRAWBUFFERSEXT) PVRGetProcAddress(glDrawBuffersEXT); 130 } 131 #endif 132 133 #if defined(GL_EXT_discard_framebuffer) 134 /* GL_EXT_discard_framebuffer */ 135 if (strstr((char *)pszGLExtensions, "GL_EXT_discard_framebuffer")) 136 { 137 glDiscardFramebufferEXT = (PFNGLDISCARDFRAMEBUFFEREXT) PVRGetProcAddress(glDiscardFramebufferEXT); 138 } 139 #endif 140 141 /* GL_EXT_occlusion_query_boolean */ 142 if (strstr((char *)pszGLExtensions, "GL_EXT_occlusion_query_boolean")) 143 { 144 glGenQueriesEXT = (PFNGLGENQUERIESEXT) PVRGetProcAddress(glGenQueriesEXT); 145 glDeleteQueriesEXT = (PFNGLDELETEQUERIESEXT) PVRGetProcAddress(glDeleteQueriesEXT); 146 glIsQueryEXT = (PFNGLISQUERYEXT) PVRGetProcAddress(glIsQueryEXT); 147 glBeginQueryEXT = (PFNGLBEGINQUERYEXT) PVRGetProcAddress(glBeginQueryEXT); 148 glEndQueryEXT = (PFNGLENDQUERYEXT) PVRGetProcAddress(glEndQueryEXT); 149 glGetQueryivEXT = (PFNGLGETQUERYIVEXT) PVRGetProcAddress(glGetQueryivEXT); 150 glGetQueryObjectuivEXT = (PFNGLGETQUERYOBJECTUIVEXT) PVRGetProcAddress(glGetQueryObjectuivEXT); 151 } 152 } 153 154 /*!*********************************************************************** 155 @Function IsGLExtensionSupported 156 @Input extension extension to query for 157 @Returns True if the extension is supported 158 @Description Queries for support of an extension 159 *************************************************************************/ 160 bool CPVRTgles2Ext::IsGLExtensionSupported(const char * const extension) 161 { 162 // The recommended technique for querying OpenGL extensions; 163 // from http://opengl.org/resources/features/OGLextensions/ 164 const GLubyte *extensions = NULL; 165 const GLubyte *start; 166 GLubyte *where, *terminator; 167 168 /* Extension names should not have spaces. */ 169 where = (GLubyte *) strchr(extension, ' '); 170 if (where || *extension == '\0') 171 return 0; 172 173 extensions = glGetString(GL_EXTENSIONS); 174 175 /* It takes a bit of care to be fool-proof about parsing the 176 OpenGL extensions string. Don't be fooled by sub-strings, etc. */ 177 start = extensions; 178 for (;;) { 179 where = (GLubyte *) strstr((const char *) start, extension); 180 if (!where) 181 break; 182 terminator = where + strlen(extension); 183 if (where == start || *(where - 1) == ' ') 184 if (*terminator == ' ' || *terminator == '\0') 185 return true; 186 start = terminator; 187 } 188 189 return false; 190 } 191 192 /***************************************************************************** 193 End of file (PVRTglesExt.cpp) 194 *****************************************************************************/ 195 196
