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1 /*
2  * (C) Copyright IBM Corporation 2003
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * on the rights to use, copy, modify, merge, publish, distribute, sub
9  * license, and/or sell copies of the Software, and to permit persons to whom
10  * the Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the next
13  * paragraph) shall be included in all copies or substantial portions of the
14  * Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 /**
26  * \file glxconfig.c
27  * Utility routines for working with \c struct glx_config structures.  At
28  * some point most or all of these functions will be moved to the Mesa
29  * code base.
30  *
31  * \author Ian Romanick <idr@us.ibm.com>
32  */
33 
34 #include <GL/glx.h>
35 #include "GL/glxint.h"
36 #include <stdlib.h>
37 #include <string.h>
38 
39 #include "glxconfig.h"
40 
41 #define NUM_VISUAL_TYPES   6
42 
43 /**
44  * Get data from a GLX config
45  *
46  * \param mode         GL context mode whose data is to be returned.
47  * \param attribute    Attribute of \c mode that is to be returned.
48  * \param value_return Location to store the data member of \c mode.
49  * \return  If \c attribute is a valid attribute of \c mode, zero is
50  *          returned.  Otherwise \c GLX_BAD_ATTRIBUTE is returned.
51  */
52 _X_HIDDEN int
glx_config_get(struct glx_config * mode,int attribute,int * value_return)53 glx_config_get(struct glx_config * mode, int attribute, int *value_return)
54 {
55    switch (attribute) {
56    case GLX_USE_GL:
57       *value_return = GL_TRUE;
58       return 0;
59    case GLX_BUFFER_SIZE:
60       *value_return = mode->rgbBits;
61       return 0;
62    case GLX_RGBA:
63       *value_return = mode->rgbMode;
64       return 0;
65    case GLX_RED_SIZE:
66       *value_return = mode->redBits;
67       return 0;
68    case GLX_GREEN_SIZE:
69       *value_return = mode->greenBits;
70       return 0;
71    case GLX_BLUE_SIZE:
72       *value_return = mode->blueBits;
73       return 0;
74    case GLX_ALPHA_SIZE:
75       *value_return = mode->alphaBits;
76       return 0;
77    case GLX_DOUBLEBUFFER:
78       *value_return = mode->doubleBufferMode;
79       return 0;
80    case GLX_STEREO:
81       *value_return = mode->stereoMode;
82       return 0;
83    case GLX_AUX_BUFFERS:
84       *value_return = mode->numAuxBuffers;
85       return 0;
86    case GLX_DEPTH_SIZE:
87       *value_return = mode->depthBits;
88       return 0;
89    case GLX_STENCIL_SIZE:
90       *value_return = mode->stencilBits;
91       return 0;
92    case GLX_ACCUM_RED_SIZE:
93       *value_return = mode->accumRedBits;
94       return 0;
95    case GLX_ACCUM_GREEN_SIZE:
96       *value_return = mode->accumGreenBits;
97       return 0;
98    case GLX_ACCUM_BLUE_SIZE:
99       *value_return = mode->accumBlueBits;
100       return 0;
101    case GLX_ACCUM_ALPHA_SIZE:
102       *value_return = mode->accumAlphaBits;
103       return 0;
104    case GLX_LEVEL:
105       *value_return = mode->level;
106       return 0;
107 #ifndef GLX_USE_APPLEGL               /* This isn't supported by CGL. */
108    case GLX_TRANSPARENT_TYPE_EXT:
109       *value_return = mode->transparentPixel;
110       return 0;
111 #endif
112    case GLX_TRANSPARENT_RED_VALUE:
113       *value_return = mode->transparentRed;
114       return 0;
115    case GLX_TRANSPARENT_GREEN_VALUE:
116       *value_return = mode->transparentGreen;
117       return 0;
118    case GLX_TRANSPARENT_BLUE_VALUE:
119       *value_return = mode->transparentBlue;
120       return 0;
121    case GLX_TRANSPARENT_ALPHA_VALUE:
122       *value_return = mode->transparentAlpha;
123       return 0;
124    case GLX_TRANSPARENT_INDEX_VALUE:
125       *value_return = mode->transparentIndex;
126       return 0;
127    case GLX_X_VISUAL_TYPE:
128       *value_return = mode->visualType;
129       return 0;
130    case GLX_CONFIG_CAVEAT:
131       *value_return = mode->visualRating;
132       return 0;
133    case GLX_VISUAL_ID:
134       *value_return = mode->visualID;
135       return 0;
136    case GLX_DRAWABLE_TYPE:
137       *value_return = mode->drawableType;
138       return 0;
139    case GLX_RENDER_TYPE:
140       *value_return = mode->renderType;
141       return 0;
142    case GLX_X_RENDERABLE:
143       *value_return = mode->xRenderable;
144       return 0;
145    case GLX_FBCONFIG_ID:
146       *value_return = mode->fbconfigID;
147       return 0;
148    case GLX_MAX_PBUFFER_WIDTH:
149       *value_return = mode->maxPbufferWidth;
150       return 0;
151    case GLX_MAX_PBUFFER_HEIGHT:
152       *value_return = mode->maxPbufferHeight;
153       return 0;
154    case GLX_MAX_PBUFFER_PIXELS:
155       *value_return = mode->maxPbufferPixels;
156       return 0;
157 #ifndef GLX_USE_APPLEGL               /* These aren't supported by CGL. */
158    case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
159       *value_return = mode->optimalPbufferWidth;
160       return 0;
161    case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
162       *value_return = mode->optimalPbufferHeight;
163       return 0;
164    case GLX_SWAP_METHOD_OML:
165       *value_return = mode->swapMethod;
166       return 0;
167 #endif
168    case GLX_SAMPLE_BUFFERS_SGIS:
169       *value_return = mode->sampleBuffers;
170       return 0;
171    case GLX_SAMPLES_SGIS:
172       *value_return = mode->samples;
173       return 0;
174    case GLX_BIND_TO_TEXTURE_RGB_EXT:
175       *value_return = mode->bindToTextureRgb;
176       return 0;
177    case GLX_BIND_TO_TEXTURE_RGBA_EXT:
178       *value_return = mode->bindToTextureRgba;
179       return 0;
180    case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
181       *value_return = mode->bindToMipmapTexture == GL_TRUE ? GL_TRUE :
182          GL_FALSE;
183       return 0;
184    case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
185       *value_return = mode->bindToTextureTargets;
186       return 0;
187    case GLX_Y_INVERTED_EXT:
188       *value_return = mode->yInverted;
189       return 0;
190 
191    case GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT:
192       *value_return = mode->sRGBCapable;
193       return 0;
194 
195       /* Applications are NOT allowed to query GLX_VISUAL_SELECT_GROUP_SGIX.
196        * It is ONLY for communication between the GLX client and the GLX
197        * server.
198        */
199    case GLX_VISUAL_SELECT_GROUP_SGIX:
200    default:
201       return GLX_BAD_ATTRIBUTE;
202    }
203 }
204 
205 
206 /**
207  * Allocate a linked list of \c struct glx_config structures.  The fields of
208  * each structure will be initialized to "reasonable" default values.  In
209  * most cases this is the default value defined by table 3.4 of the GLX
210  * 1.3 specification.  This means that most values are either initialized to
211  * zero or \c GLX_DONT_CARE (which is -1).  As support for additional
212  * extensions is added, the new values will be initialized to appropriate
213  * values from the extension specification.
214  *
215  * \param count         Number of structures to allocate.
216  * \param minimum_size  Minimum size of a structure to allocate.  This allows
217  *                      for differences in the version of the
218  *                      \c struct glx_config stucture used in libGL and in a
219  *                      DRI-based driver.
220  * \returns A pointer to the first element in a linked list of \c count
221  *          stuctures on success, or \c NULL on failure.
222  */
223 _X_HIDDEN struct glx_config *
glx_config_create_list(unsigned count)224 glx_config_create_list(unsigned count)
225 {
226    const size_t size = sizeof(struct glx_config);
227    struct glx_config *base = NULL;
228    struct glx_config **next;
229    unsigned i;
230 
231    next = &base;
232    for (i = 0; i < count; i++) {
233       *next = malloc(size);
234       if (*next == NULL) {
235 	 glx_config_destroy_list(base);
236 	 base = NULL;
237 	 break;
238       }
239 
240       (void) memset(*next, 0, size);
241       (*next)->visualID = GLX_DONT_CARE;
242       (*next)->visualType = GLX_DONT_CARE;
243       (*next)->visualRating = GLX_NONE;
244       (*next)->transparentPixel = GLX_NONE;
245       (*next)->transparentRed = GLX_DONT_CARE;
246       (*next)->transparentGreen = GLX_DONT_CARE;
247       (*next)->transparentBlue = GLX_DONT_CARE;
248       (*next)->transparentAlpha = GLX_DONT_CARE;
249       (*next)->transparentIndex = GLX_DONT_CARE;
250       (*next)->xRenderable = GLX_DONT_CARE;
251       (*next)->fbconfigID = GLX_DONT_CARE;
252       (*next)->swapMethod = GLX_SWAP_UNDEFINED_OML;
253       (*next)->bindToTextureRgb = GLX_DONT_CARE;
254       (*next)->bindToTextureRgba = GLX_DONT_CARE;
255       (*next)->bindToMipmapTexture = GLX_DONT_CARE;
256       (*next)->bindToTextureTargets = GLX_DONT_CARE;
257       (*next)->yInverted = GLX_DONT_CARE;
258       (*next)->sRGBCapable = GLX_DONT_CARE;
259 
260       next = &((*next)->next);
261    }
262 
263    return base;
264 }
265 
266 _X_HIDDEN void
glx_config_destroy_list(struct glx_config * configs)267 glx_config_destroy_list(struct glx_config *configs)
268 {
269    while (configs != NULL) {
270       struct glx_config *const next = configs->next;
271 
272       free(configs);
273       configs = next;
274    }
275 }
276 
277 
278 /**
279  * Find a context mode matching a Visual ID.
280  *
281  * \param modes  List list of context-mode structures to be searched.
282  * \param vid    Visual ID to be found.
283  * \returns A pointer to a context-mode in \c modes if \c vid was found in
284  *          the list, or \c NULL if it was not.
285  */
286 
287 _X_HIDDEN struct glx_config *
glx_config_find_visual(struct glx_config * configs,int vid)288 glx_config_find_visual(struct glx_config *configs, int vid)
289 {
290    struct glx_config *c;
291 
292    for (c = configs; c != NULL; c = c->next)
293       if (c->visualID == vid)
294 	 return c;
295 
296    return NULL;
297 }
298 
299 _X_HIDDEN struct glx_config *
glx_config_find_fbconfig(struct glx_config * configs,int fbid)300 glx_config_find_fbconfig(struct glx_config *configs, int fbid)
301 {
302    struct glx_config *c;
303 
304    for (c = configs; c != NULL; c = c->next)
305       if (c->fbconfigID == fbid)
306 	 return c;
307 
308    return NULL;
309 }
310