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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 /* AGL implementation of SDL OpenGL support */ |
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25 |
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26 #include "SDL_lowvideo.h" |
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27 #include "SDL_macgl_c.h" |
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28 #include "SDL_loadso.h" |
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29 |
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30 |
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31 /* krat: adding OpenGL support */ |
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32 int Mac_GL_Init(_THIS) |
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33 { |
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34 #if SDL_VIDEO_OPENGL |
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35 AGLPixelFormat format; |
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36 int i = 0; |
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37 GLint attributes [ 26 ]; /* 26 is max possible in this setup */ |
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38 GLboolean noerr; |
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39 |
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40 /* load the gl driver from a default path */ |
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41 if ( ! this->gl_config.driver_loaded ) { |
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42 /* no driver has been loaded, use default (ourselves) */ |
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43 if ( Mac_GL_LoadLibrary(this, NULL) < 0 ) { |
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44 return(-1); |
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45 } |
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46 } |
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47 |
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48 attributes[i++] = AGL_RGBA; |
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49 if ( this->gl_config.red_size != 0 && |
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50 this->gl_config.blue_size != 0 && |
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51 this->gl_config.green_size != 0 ) { |
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52 attributes[i++] = AGL_RED_SIZE; |
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53 attributes[i++] = this->gl_config.red_size; |
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54 attributes[i++] = AGL_GREEN_SIZE; |
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55 attributes[i++] = this->gl_config.green_size; |
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56 attributes[i++] = AGL_BLUE_SIZE; |
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57 attributes[i++] = this->gl_config.blue_size; |
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58 attributes[i++] = AGL_ALPHA_SIZE; |
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59 attributes[i++] = this->gl_config.alpha_size; |
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60 } |
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61 if ( this->gl_config.double_buffer ) { |
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62 attributes[i++] = AGL_DOUBLEBUFFER; |
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63 } |
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64 if ( this->gl_config.depth_size != 0 ) { |
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65 attributes[i++] = AGL_DEPTH_SIZE; |
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66 attributes[i++] = this->gl_config.depth_size; |
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67 } |
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68 if ( this->gl_config.stencil_size != 0 ) { |
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69 attributes[i++] = AGL_STENCIL_SIZE; |
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70 attributes[i++] = this->gl_config.stencil_size; |
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71 } |
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72 if ( this->gl_config.accum_red_size != 0 && |
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73 this->gl_config.accum_blue_size != 0 && |
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74 this->gl_config.accum_green_size != 0 ) { |
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75 |
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76 attributes[i++] = AGL_ACCUM_RED_SIZE; |
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77 attributes[i++] = this->gl_config.accum_red_size; |
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78 attributes[i++] = AGL_ACCUM_GREEN_SIZE; |
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79 attributes[i++] = this->gl_config.accum_green_size; |
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80 attributes[i++] = AGL_ACCUM_BLUE_SIZE; |
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81 attributes[i++] = this->gl_config.accum_blue_size; |
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82 attributes[i++] = AGL_ACCUM_ALPHA_SIZE; |
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83 attributes[i++] = this->gl_config.accum_alpha_size; |
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84 } |
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85 if ( this->gl_config.stereo ) { |
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86 attributes[i++] = AGL_STEREO; |
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87 } |
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88 #if defined(AGL_SAMPLE_BUFFERS_ARB) && defined(AGL_SAMPLES_ARB) |
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89 if ( this->gl_config.multisamplebuffers != 0 ) { |
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90 attributes[i++] = AGL_SAMPLE_BUFFERS_ARB; |
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91 attributes[i++] = this->gl_config.multisamplebuffers; |
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92 } |
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93 if ( this->gl_config.multisamplesamples != 0 ) { |
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94 attributes[i++] = AGL_SAMPLES_ARB; |
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95 attributes[i++] = this->gl_config.multisamplesamples; |
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96 } |
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97 #endif |
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98 if ( this->gl_config.accelerated > 0 ) { |
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99 attributes[i++] = AGL_ACCELERATED; |
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100 attributes[i++] = AGL_NO_RECOVERY; |
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101 } |
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102 |
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103 attributes[i++] = AGL_ALL_RENDERERS; |
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104 attributes[i] = AGL_NONE; |
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105 |
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106 format = aglChoosePixelFormat(NULL, 0, attributes); |
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107 if ( format == NULL ) { |
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108 SDL_SetError("Couldn't match OpenGL desired format"); |
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109 return(-1); |
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110 } |
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111 |
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112 glContext = aglCreateContext(format, NULL); |
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113 if ( glContext == NULL ) { |
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114 SDL_SetError("Couldn't create OpenGL context"); |
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115 return(-1); |
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116 } |
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117 aglDestroyPixelFormat(format); |
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118 |
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119 #if TARGET_API_MAC_CARBON |
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120 noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window)); |
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121 #else |
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122 noerr = aglSetDrawable(glContext, (AGLDrawable)SDL_Window); |
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123 #endif |
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124 |
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125 if(!noerr) { |
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126 SDL_SetError("Unable to bind GL context to window"); |
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127 return(-1); |
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128 } |
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129 return(0); |
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130 #else |
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131 SDL_SetError("OpenGL support not configured"); |
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132 return(-1); |
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133 #endif |
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134 } |
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135 |
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136 void Mac_GL_Quit(_THIS) |
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137 { |
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138 #if SDL_VIDEO_OPENGL |
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139 if ( glContext != NULL ) { |
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140 aglSetCurrentContext(NULL); |
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141 aglSetDrawable(glContext, NULL); |
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142 aglDestroyContext(glContext); |
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143 glContext = NULL; |
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144 } |
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145 #endif |
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146 } |
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147 |
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148 #if SDL_VIDEO_OPENGL |
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149 |
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150 /* Make the current context active */ |
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151 int Mac_GL_MakeCurrent(_THIS) |
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152 { |
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153 int retval; |
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154 |
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155 retval = 0; |
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156 if( ! aglSetCurrentContext(glContext) ) { |
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157 SDL_SetError("Unable to make GL context current"); |
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158 retval = -1; |
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159 } |
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160 return(retval); |
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161 } |
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162 |
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163 void Mac_GL_SwapBuffers(_THIS) |
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164 { |
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165 aglSwapBuffers(glContext); |
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166 } |
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167 |
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168 int Mac_GL_LoadLibrary(_THIS, const char *location) |
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169 { |
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170 if (location == NULL) |
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171 #if __MACH__ |
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172 location = "/System/Library/Frameworks/OpenGL.framework/OpenGL"; |
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173 #else |
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174 location = "OpenGLLibrary"; |
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175 #endif |
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176 |
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177 this->hidden->libraryHandle = SDL_LoadObject(location); |
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178 |
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179 this->gl_config.driver_loaded = 1; |
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180 return (this->hidden->libraryHandle != NULL) ? 0 : -1; |
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181 } |
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182 |
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183 void Mac_GL_UnloadLibrary(_THIS) |
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184 { |
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185 SDL_UnloadObject(this->hidden->libraryHandle); |
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186 |
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187 this->hidden->libraryHandle = NULL; |
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188 this->gl_config.driver_loaded = 0; |
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189 } |
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190 |
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191 void* Mac_GL_GetProcAddress(_THIS, const char *proc) |
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192 { |
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193 return SDL_LoadFunction( this->hidden->libraryHandle, proc ); |
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194 } |
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195 |
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196 #endif /* SDL_VIDEO_OPENGL */ |
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197 |