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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 (at) 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
     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 *
    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
    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 *
    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 *
    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