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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* AGL implementation of SDL OpenGL support */
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29
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30 #include "SDL_error.h"
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31 #include "SDL_lowvideo.h"
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32 #include "SDL_macgl_c.h"
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33
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34
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35 /* krat: adding OpenGL support */
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36 int Mac_GL_Init(_THIS)
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37 {
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38 #ifdef HAVE_OPENGL
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39 AGLPixelFormat format;
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40 int i = 0;
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41 GLint attributes [ 24 ]; /* 24 is max possible in this setup */
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42 GLboolean noerr;
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43
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44 attributes[i++] = AGL_RGBA;
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45
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46 if ( this->gl_config.double_buffer ) {
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47 attributes[i++] = AGL_DOUBLEBUFFER;
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48 }
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49 if ( this->gl_config.depth_size != 0 ) {
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50 attributes[i++] = AGL_DEPTH_SIZE;
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51 attributes[i++] = this->gl_config.depth_size;
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52 }
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53 if ( this->gl_config.red_size != 0 &&
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54 this->gl_config.blue_size != 0 &&
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55 this->gl_config.green_size != 0 ) {
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56
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57 attributes[i++] = AGL_RED_SIZE;
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58 attributes[i++] = this->gl_config.red_size;
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59 attributes[i++] = AGL_GREEN_SIZE;
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60 attributes[i++] = this->gl_config.green_size;
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61 attributes[i++] = AGL_BLUE_SIZE;
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62 attributes[i++] = this->gl_config.blue_size;
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63 attributes[i++] = AGL_ALPHA_SIZE;
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64 attributes[i++] = this->gl_config.alpha_size;
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65 }
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66 if ( this->gl_config.stencil_size != 0 ) {
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67 attributes[i++] = AGL_STENCIL_SIZE;
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68 attributes[i++] = this->gl_config.stencil_size;
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69 }
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70 if ( this->gl_config.accum_red_size != 0 &&
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71 this->gl_config.accum_blue_size != 0 &&
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72 this->gl_config.accum_green_size != 0 ) {
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73
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74 attributes[i++] = AGL_ACCUM_RED_SIZE;
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75 attributes[i++] = this->gl_config.accum_red_size;
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76 attributes[i++] = AGL_ACCUM_GREEN_SIZE;
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77 attributes[i++] = this->gl_config.accum_green_size;
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78 attributes[i++] = AGL_ACCUM_BLUE_SIZE;
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79 attributes[i++] = this->gl_config.accum_blue_size;
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80 attributes[i++] = AGL_ACCUM_ALPHA_SIZE;
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81 attributes[i++] = this->gl_config.accum_alpha_size;
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82 }
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83 attributes[i++] = AGL_ALL_RENDERERS;
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84 attributes[i] = AGL_NONE;
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85
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86 format = aglChoosePixelFormat(NULL, 0, attributes);
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87 if ( format == NULL ) {
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88 SDL_SetError("Couldn't match OpenGL desired format");
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89 return(-1);
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90 }
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91
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92 glContext = aglCreateContext(format, NULL);
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93 if ( glContext == NULL ) {
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94 SDL_SetError("Couldn't create OpenGL context");
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95 return(-1);
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96 }
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97 aglDestroyPixelFormat(format);
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98
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99 #if TARGET_API_MAC_CARBON
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100 noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window));
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101 #else
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102 noerr = aglSetDrawable(glContext, (AGLDrawable)SDL_Window);
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103 #endif
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104
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105 if(!noerr) {
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106 SDL_SetError("Unable to bind GL context to window");
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107 return(-1);
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108 }
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109 return(0);
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110 #else
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111 SDL_SetError("OpenGL support not configured");
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112 return(-1);
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113 #endif
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114 }
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115
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116 void Mac_GL_Quit(_THIS)
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117 {
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118 #ifdef HAVE_OPENGL
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119 if ( glContext != NULL ) {
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120 aglSetCurrentContext(NULL);
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121 aglSetDrawable(glContext, NULL);
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122 aglDestroyContext(glContext);
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123 glContext = NULL;
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124 }
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125 #endif
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126 }
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127
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128 #ifdef HAVE_OPENGL
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129
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130 /* Make the current context active */
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131 int Mac_GL_MakeCurrent(_THIS)
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132 {
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133 int retval;
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134
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135 retval = 0;
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136 if( ! aglSetCurrentContext(glContext) ) {
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137 SDL_SetError("Unable to make GL context current");
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138 retval = -1;
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139 }
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140 return(retval);
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141 }
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142
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143 void Mac_GL_SwapBuffers(_THIS)
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144 {
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145 aglSwapBuffers(glContext);
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146 }
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147
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148 #endif /* HAVE_OPENGL */
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149
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