1/* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2006 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 19 Sam Lantinga 20 slouken@libsdl.org 21*/ 22#include "SDL_config.h" 23 24/* StormMesa implementation of SDL OpenGL support */ 25 26#include "SDL_cgxgl_c.h" 27#include "SDL_cgxvideo.h" 28 29#if SDL_VIDEO_OPENGL 30AmigaMesaContext glcont=NULL; 31#endif 32 33/* Init OpenGL */ 34int CGX_GL_Init(_THIS) 35{ 36#if SDL_VIDEO_OPENGL 37 int i = 0; 38 struct TagItem attributes [ 14 ]; /* 14 should be more than enough :) */ 39 struct Window *win = (struct Window *)SDL_Window; 40 41 // default config. Always used... 42 attributes[i].ti_Tag = AMA_Window; attributes[i++].ti_Data = (unsigned long)win; 43 attributes[i].ti_Tag = AMA_Left; attributes[i++].ti_Data = 0; 44 attributes[i].ti_Tag = AMA_Bottom; attributes[i++].ti_Data = 0; 45 attributes[i].ti_Tag = AMA_Width; attributes[i++].ti_Data = win->Width-win->BorderLeft-win->BorderRight; 46 attributes[i].ti_Tag = AMA_Height; attributes[i++].ti_Data = win->Height-win->BorderBottom-win->BorderTop; 47 attributes[i].ti_Tag = AMA_DirectRender; attributes[i++].ti_Data = GL_TRUE; 48 49 // double buffer ? 50 attributes[i].ti_Tag = AMA_DoubleBuf; 51 if ( this->gl_config.double_buffer ) { 52 attributes[i++].ti_Data = GL_TRUE; 53 } 54 else { 55 attributes[i++].ti_Data = GL_FALSE; 56 } 57 // RGB(A) Mode ? 58 attributes[i].ti_Tag = AMA_RGBMode; 59 if ( this->gl_config.red_size != 0 && 60 this->gl_config.blue_size != 0 && 61 this->gl_config.green_size != 0 ) { 62 attributes[i++].ti_Data = GL_TRUE; 63 } 64 else { 65 attributes[i++].ti_Data = GL_FALSE; 66 } 67 // no depth buffer ? 68 if ( this->gl_config.depth_size == 0 ) { 69 attributes[i].ti_Tag = AMA_NoDepth; 70 attributes[i++].ti_Data = GL_TRUE; 71 } 72 // no stencil buffer ? 73 if ( this->gl_config.stencil_size == 0 ) { 74 attributes[i].ti_Tag = AMA_NoStencil; 75 attributes[i++].ti_Data = GL_TRUE; 76 } 77 // no accum buffer ? 78 if ( this->gl_config.accum_red_size != 0 && 79 this->gl_config.accum_blue_size != 0 && 80 this->gl_config.accum_green_size != 0 ) { 81 attributes[i].ti_Tag = AMA_NoAccum; 82 attributes[i++].ti_Data = GL_TRUE; 83 } 84 // done... 85 attributes[i].ti_Tag = TAG_DONE; 86 87 glcont = AmigaMesaCreateContext(attributes); 88 if ( glcont == NULL ) { 89 SDL_SetError("Couldn't create OpenGL context"); 90 return(-1); 91 } 92 this->gl_data->gl_active = 1; 93 this->gl_config.driver_loaded = 1; 94 95 return(0); 96#else 97 SDL_SetError("OpenGL support not configured"); 98 return(-1); 99#endif 100} 101 102/* Quit OpenGL */ 103void CGX_GL_Quit(_THIS) 104{ 105#if SDL_VIDEO_OPENGL 106 if ( glcont != NULL ) { 107 AmigaMesaDestroyContext(glcont); 108 glcont = NULL; 109 this->gl_data->gl_active = 0; 110 this->gl_config.driver_loaded = 0; 111 } 112#endif 113} 114 115/* Attach context to another window */ 116int CGX_GL_Update(_THIS) 117{ 118#if SDL_VIDEO_OPENGL 119 struct TagItem tags[2]; 120 struct Window *win = (struct Window*)SDL_Window; 121 if(glcont == NULL) { 122 return -1; //should never happen 123 } 124 tags[0].ti_Tag = AMA_Window; 125 tags[0].ti_Data = (unsigned long)win; 126 tags[1].ti_Tag = TAG_DONE; 127 AmigaMesaSetRast(glcont, tags); 128 129 return 0; 130#else 131 SDL_SetError("OpenGL support not configured"); 132 return -1; 133#endif 134} 135 136#if SDL_VIDEO_OPENGL 137 138/* Make the current context active */ 139int CGX_GL_MakeCurrent(_THIS) 140{ 141 if(glcont == NULL) 142 return -1; 143 144 AmigaMesaMakeCurrent(glcont, glcont->buffer); 145 return 0; 146} 147 148void CGX_GL_SwapBuffers(_THIS) 149{ 150 AmigaMesaSwapBuffers(glcont); 151} 152 153int CGX_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) { 154 GLenum mesa_attrib; 155 156 switch(attrib) { 157 case SDL_GL_RED_SIZE: 158 mesa_attrib = GL_RED_BITS; 159 break; 160 case SDL_GL_GREEN_SIZE: 161 mesa_attrib = GL_GREEN_BITS; 162 break; 163 case SDL_GL_BLUE_SIZE: 164 mesa_attrib = GL_BLUE_BITS; 165 break; 166 case SDL_GL_ALPHA_SIZE: 167 mesa_attrib = GL_ALPHA_BITS; 168 break; 169 case SDL_GL_DOUBLEBUFFER: 170 mesa_attrib = GL_DOUBLEBUFFER; 171 break; 172 case SDL_GL_DEPTH_SIZE: 173 mesa_attrib = GL_DEPTH_BITS; 174 break; 175 case SDL_GL_STENCIL_SIZE: 176 mesa_attrib = GL_STENCIL_BITS; 177 break; 178 case SDL_GL_ACCUM_RED_SIZE: 179 mesa_attrib = GL_ACCUM_RED_BITS; 180 break; 181 case SDL_GL_ACCUM_GREEN_SIZE: 182 mesa_attrib = GL_ACCUM_GREEN_BITS; 183 break; 184 case SDL_GL_ACCUM_BLUE_SIZE: 185 mesa_attrib = GL_ACCUM_BLUE_BITS; 186 break; 187 case SDL_GL_ACCUM_ALPHA_SIZE: 188 mesa_attrib = GL_ACCUM_ALPHA_BITS; 189 break; 190 default : 191 return -1; 192 } 193 194 AmigaMesaGetConfig(glcont->visual, mesa_attrib, value); 195 return 0; 196} 197 198void *CGX_GL_GetProcAddress(_THIS, const char *proc) { 199 void *func = NULL; 200 func = AmiGetGLProc(proc); 201 return func; 202} 203 204int CGX_GL_LoadLibrary(_THIS, const char *path) { 205 /* Library is always open */ 206 this->gl_config.driver_loaded = 1; 207 208 return 0; 209} 210 211#endif /* SDL_VIDEO_OPENGL */ 212 213