1 | // Comments:
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2 | //
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3 | // The trick with GLH_EXT_SINGLE_FILE is that you need to have it defined in
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4 | // exactly one cpp file because it piggy-backs the function implementations in
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5 | // the header. You don't want multiple implementations defined or the linker
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6 | // gets mad, but one file must have the implementations in it or the linker
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7 | // gets mad for different reasons.
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8 | //
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9 | // The goal was to avoid having this helper require a separate cpp file. One
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10 | // thing you could do is just have a glh_extensions.cpp that did
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11 | //
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12 | // #define GLH_EXT_SINGLE_FILE
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13 | // #include <glh_extensions.h>
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14 | //
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15 | // and make it the only file that ever defines GLH_EXT_SINGLE_FILE.
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16 |
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17 | #ifndef GLH_EXTENSIONS
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18 | #define GLH_EXTENSIONS
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19 |
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20 | #include <string.h>
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21 | #include <stdio.h>
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22 | #include <stdlib.h>
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23 |
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24 | #if defined(WIN32)
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25 | # include <windows.h>
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26 | #endif
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27 |
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28 | #ifdef MACOS
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29 | #include <OpenGL/gl.h>
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30 | #else
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31 | #include <GL/gl.h>
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32 | #endif
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33 |
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34 | #ifdef WIN32
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35 | # include <GL/wglext.h>
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36 | #endif
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37 |
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38 | #define CHECK_MEMORY(ptr) \
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39 | if (NULL == ptr) { \
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40 | printf("Error allocating memory in file %s, line %d\n", __FILE__, __LINE__); \
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41 | exit(-1); \
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42 | }
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43 |
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44 | #ifdef GLH_EXT_SINGLE_FILE
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45 | # define GLH_EXTENSIONS_SINGLE_FILE // have to do this because glh_genext.h unsets GLH_EXT_SINGLE_FILE
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46 | #endif
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47 |
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48 | #if (defined(WIN32) || defined(UNIX))
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49 | #include "glh_genext.h"
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50 | #elif defined(MACOS)
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51 | #include <OpenGL/glext.h>
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52 | #else
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53 | #include <GL/glext.h>
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54 | #endif
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55 |
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56 | #ifdef __cplusplus
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57 | extern "C" {
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58 | #endif
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59 |
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60 | #ifdef GLH_EXTENSIONS_SINGLE_FILE
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61 | static char *unsupportedExts = NULL;
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62 | static char *sysExts = NULL;
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63 | #ifndef GL_SHADER_CONSISTENT_NV
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64 | #define GL_SHADER_CONSISTENT_NV 0x86DD
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65 | #endif
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66 | #ifndef GL_TEXTURE_SHADER_NV
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67 | #define GL_TEXTURE_SHADER_NV 0x86DE
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68 | #endif
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69 | #ifndef GL_SHADER_OPERATION_NV
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70 | #define GL_SHADER_OPERATION_NV 0x86DF
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71 | #endif
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72 |
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73 | static int ExtensionExists(const char* extName, const char* sysExts)
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74 | {
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75 | char *padExtName = (char*)malloc(strlen(extName) + 2);
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76 | strcat(strcpy(padExtName, extName), " ");
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77 |
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78 | if (0 == strcmp(extName, "GL_VERSION_1_2")) {
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79 | const char *version = (const char*)glGetString(GL_VERSION);
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80 | if (strstr(version, "1.0") == version || strstr(version, "1.1") == version) {
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81 | return GL_FALSE;
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82 | } else {
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83 | return GL_TRUE;
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84 | }
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85 | }
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86 | if (0 == strcmp(extName, "GL_VERSION_1_3")) {
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87 | const char *version = (const char*)glGetString(GL_VERSION);
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88 | if (strstr(version, "1.0") == version ||
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89 | strstr(version, "1.1") == version ||
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90 | strstr(version, "1.2") == version) {
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91 | return GL_FALSE;
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92 | } else {
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93 | return GL_TRUE;
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94 | }
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95 | }
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96 | if (0 == strcmp(extName, "GL_VERSION_1_4")) {
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97 | const char *version = (const char*)glGetString(GL_VERSION);
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98 | if (strstr(version, "1.0") == version ||
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99 | strstr(version, "1.1") == version ||
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100 | strstr(version, "1.2") == version ||
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101 | strstr(version, "1.3") == version) {
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102 | return GL_FALSE;
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103 | } else {
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104 | return GL_TRUE;
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105 | }
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106 | }
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107 | if (0 == strcmp(extName, "GL_VERSION_1_5")) {
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108 | const char *version = (const char*)glGetString(GL_VERSION);
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109 | if (strstr(version, "1.0") == version ||
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110 | strstr(version, "1.1") == version ||
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111 | strstr(version, "1.2") == version ||
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112 | strstr(version, "1.3") == version ||
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113 | strstr(version, "1.4") == version) {
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114 | return GL_FALSE;
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115 | } else {
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116 | return GL_TRUE;
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117 | }
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118 | }
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119 | if (strstr(sysExts, padExtName)) {
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120 | free(padExtName);
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121 | return GL_TRUE;
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122 | } else {
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123 | free(padExtName);
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124 | return GL_FALSE;
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125 | }
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126 | }
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127 |
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128 | static const char* EatWhiteSpace(const char *str)
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129 | {
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130 | for (; *str && (' ' == *str || '\t' == *str || '\n' == *str); str++);
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131 | return str;
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132 | }
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133 |
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134 | static const char* EatNonWhiteSpace(const char *str)
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135 | {
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136 | for (; *str && (' ' != *str && '\t' != *str && '\n' != *str); str++);
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137 | return str;
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138 | }
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139 |
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140 | int glh_init_extensions(const char *origReqExts)
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141 | {
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142 | // Length of requested extensions string
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143 | size_t reqExtsLen;
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144 | char *reqExts;
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145 | // Ptr for individual extensions within reqExts
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146 | char *reqExt;
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147 | int success = GL_TRUE;
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148 | // build space-padded extension string
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149 | if (NULL == sysExts) {
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150 | const char *extensions = (const char*)glGetString(GL_EXTENSIONS);
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151 | size_t sysExtsLen = strlen(extensions);
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152 | const char *winsys_extensions = "";
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153 | size_t winsysExtsLen = 0;
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154 | #if defined(WIN32)
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155 | {
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156 | PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB = 0;
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157 | wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)wglGetProcAddress("wglGetExtensionsStringARB");
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158 | if(wglGetExtensionsStringARB)
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159 | {
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160 | winsys_extensions = wglGetExtensionsStringARB(wglGetCurrentDC());
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161 | winsysExtsLen = strlen(winsys_extensions);
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162 | }
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163 | }
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164 | #elif defined(UNIX)
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165 | {
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166 |
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167 | winsys_extensions = glXQueryExtensionsString (glXGetCurrentDisplay(),DefaultScreen(glXGetCurrentDisplay())) ;
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168 | winsysExtsLen = strlen (winsys_extensions);
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169 | }
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170 | #endif
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171 | // Add 2 bytes, one for padding space, one for terminating NULL
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172 | sysExts = (char*)malloc(sysExtsLen + winsysExtsLen + 3);
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173 | CHECK_MEMORY(sysExts);
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174 | strcpy(sysExts, extensions);
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175 | sysExts[sysExtsLen] = ' ';
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176 | sysExts[sysExtsLen + 1] = 0;
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177 | strcat(sysExts, winsys_extensions);
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178 | sysExts[sysExtsLen + 1 + winsysExtsLen] = ' ';
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179 | sysExts[sysExtsLen + 1 + winsysExtsLen + 1] = 0;
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180 | }
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181 |
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182 | if (NULL == origReqExts)
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183 | return GL_TRUE;
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184 | reqExts = strdup(origReqExts);
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185 | reqExtsLen = strlen(reqExts);
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186 | if (NULL == unsupportedExts) {
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187 | unsupportedExts = (char*)malloc(reqExtsLen + 2);
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188 | } else if (reqExtsLen > strlen(unsupportedExts)) {
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189 | unsupportedExts = (char*)realloc(unsupportedExts, reqExtsLen + 2);
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190 | }
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191 | CHECK_MEMORY(unsupportedExts);
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192 | *unsupportedExts = 0;
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193 |
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194 | // Parse requested extension list
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195 | for (reqExt = reqExts;
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196 | (reqExt = (char*)EatWhiteSpace(reqExt)) && *reqExt;
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197 | reqExt = (char*)EatNonWhiteSpace(reqExt))
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198 | {
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199 | char *extEnd = (char*)EatNonWhiteSpace(reqExt);
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200 | char saveChar = *extEnd;
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201 | *extEnd = (char)0;
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202 |
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203 | #if (defined(WIN32) || defined(UNIX))
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204 | if (!ExtensionExists(reqExt, sysExts) || !glh_init_extension(reqExt)) {
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205 | #elif defined(MACOS)
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206 | if (!ExtensionExists(reqExt, sysExts)) { // don't try to get function pointers if on MacOS
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207 | #endif
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208 | // add reqExt to end of unsupportedExts
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209 | strcat(unsupportedExts, reqExt);
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210 | strcat(unsupportedExts, " ");
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211 | success = GL_FALSE;
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212 | }
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213 | *extEnd = saveChar;
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214 | }
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215 | free(reqExts);
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216 | return success;
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217 | }
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218 |
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219 | const char* glh_get_unsupported_extensions()
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220 | {
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221 | return (const char*)unsupportedExts;
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222 | }
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223 |
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224 | void glh_shutdown_extensions()
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225 | {
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226 | if (unsupportedExts)
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227 | {
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228 | free(unsupportedExts);
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229 | unsupportedExts = NULL;
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230 | }
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231 | if (sysExts)
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232 | {
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233 | free(sysExts);
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234 | sysExts = NULL;
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235 | }
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236 | }
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237 |
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238 | int glh_extension_supported(const char *extension)
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239 | {
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240 | static const GLubyte *extensions = NULL;
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241 | const GLubyte *start;
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242 | GLubyte *where, *terminator;
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243 |
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244 | // Extension names should not have spaces.
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245 | where = (GLubyte *) strchr(extension, ' ');
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246 | if (where || *extension == '\0')
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247 | return 0;
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248 |
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249 | if (!extensions)
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250 | extensions = glGetString(GL_EXTENSIONS);
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251 |
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252 | // It takes a bit of care to be fool-proof about parsing the
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253 | // OpenGL extensions string. Don't be fooled by sub-strings,
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254 | // etc.
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255 | start = extensions;
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256 | for (;;)
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257 | {
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258 | where = (GLubyte *) strstr((const char *) start, extension);
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259 | if (!where)
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260 | break;
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261 | terminator = where + strlen(extension);
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262 | if (where == start || *(where - 1) == ' ')
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263 | {
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264 | if (*terminator == ' ' || *terminator == '\0')
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265 | {
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266 | return 1;
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267 | }
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268 | }
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269 | start = terminator;
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270 | }
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271 | return 0;
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272 | }
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273 |
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274 | #else
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275 | int glh_init_extensions(const char *origReqExts);
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276 | const char* glh_get_unsupported_extensions();
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277 | void glh_shutdown_extensions();
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278 | int glh_extension_supported(const char *extension);
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279 | #endif /* GLH_EXT_SINGLE_FILE */
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280 |
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281 | #ifdef __cplusplus
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282 | }
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283 | #endif
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284 |
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285 | #endif /* GLH_EXTENSIONS */
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