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
30 AmigaMesaContext glcont=NULL;
31 #endif
32
33 /* Init OpenGL */
CGX_GL_Init(_THIS)34 int 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 */
CGX_GL_Quit(_THIS)103 void 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 */
CGX_GL_Update(_THIS)116 int 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 */
CGX_GL_MakeCurrent(_THIS)139 int CGX_GL_MakeCurrent(_THIS)
140 {
141 if(glcont == NULL)
142 return -1;
143
144 AmigaMesaMakeCurrent(glcont, glcont->buffer);
145 return 0;
146 }
147
CGX_GL_SwapBuffers(_THIS)148 void CGX_GL_SwapBuffers(_THIS)
149 {
150 AmigaMesaSwapBuffers(glcont);
151 }
152
CGX_GL_GetAttribute(_THIS,SDL_GLattr attrib,int * value)153 int 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
CGX_GL_GetProcAddress(_THIS,const char * proc)198 void *CGX_GL_GetProcAddress(_THIS, const char *proc) {
199 void *func = NULL;
200 func = AmiGetGLProc(proc);
201 return func;
202 }
203
CGX_GL_LoadLibrary(_THIS,const char * path)204 int 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