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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 <stdlib.h>
     36 #include <string.h>
     37 
     38 #include "glxconfig.h"
     39 
     40 #define NUM_VISUAL_TYPES   6
     41 
     42 /**
     43  * Get data from a GLX config
     44  *
     45  * \param mode         GL context mode whose data is to be returned.
     46  * \param attribute    Attribute of \c mode that is to be returned.
     47  * \param value_return Location to store the data member of \c mode.
     48  * \return  If \c attribute is a valid attribute of \c mode, zero is
     49  *          returned.  Otherwise \c GLX_BAD_ATTRIBUTE is returned.
     50  */
     51 _X_HIDDEN int
     52 glx_config_get(struct glx_config * mode, int attribute, int *value_return)
     53 {
     54    switch (attribute) {
     55    case GLX_USE_GL:
     56       *value_return = GL_TRUE;
     57       return 0;
     58    case GLX_BUFFER_SIZE:
     59       *value_return = mode->rgbBits;
     60       return 0;
     61    case GLX_RGBA:
     62       *value_return = mode->rgbMode;
     63       return 0;
     64    case GLX_RED_SIZE:
     65       *value_return = mode->redBits;
     66       return 0;
     67    case GLX_GREEN_SIZE:
     68       *value_return = mode->greenBits;
     69       return 0;
     70    case GLX_BLUE_SIZE:
     71       *value_return = mode->blueBits;
     72       return 0;
     73    case GLX_ALPHA_SIZE:
     74       *value_return = mode->alphaBits;
     75       return 0;
     76    case GLX_DOUBLEBUFFER:
     77       *value_return = mode->doubleBufferMode;
     78       return 0;
     79    case GLX_STEREO:
     80       *value_return = mode->stereoMode;
     81       return 0;
     82    case GLX_AUX_BUFFERS:
     83       *value_return = mode->numAuxBuffers;
     84       return 0;
     85    case GLX_DEPTH_SIZE:
     86       *value_return = mode->depthBits;
     87       return 0;
     88    case GLX_STENCIL_SIZE:
     89       *value_return = mode->stencilBits;
     90       return 0;
     91    case GLX_ACCUM_RED_SIZE:
     92       *value_return = mode->accumRedBits;
     93       return 0;
     94    case GLX_ACCUM_GREEN_SIZE:
     95       *value_return = mode->accumGreenBits;
     96       return 0;
     97    case GLX_ACCUM_BLUE_SIZE:
     98       *value_return = mode->accumBlueBits;
     99       return 0;
    100    case GLX_ACCUM_ALPHA_SIZE:
    101       *value_return = mode->accumAlphaBits;
    102       return 0;
    103    case GLX_LEVEL:
    104       *value_return = mode->level;
    105       return 0;
    106 #ifndef GLX_USE_APPLEGL               /* This isn't supported by CGL. */
    107    case GLX_TRANSPARENT_TYPE_EXT:
    108       *value_return = mode->transparentPixel;
    109       return 0;
    110 #endif
    111    case GLX_TRANSPARENT_RED_VALUE:
    112       *value_return = mode->transparentRed;
    113       return 0;
    114    case GLX_TRANSPARENT_GREEN_VALUE:
    115       *value_return = mode->transparentGreen;
    116       return 0;
    117    case GLX_TRANSPARENT_BLUE_VALUE:
    118       *value_return = mode->transparentBlue;
    119       return 0;
    120    case GLX_TRANSPARENT_ALPHA_VALUE:
    121       *value_return = mode->transparentAlpha;
    122       return 0;
    123    case GLX_TRANSPARENT_INDEX_VALUE:
    124       *value_return = mode->transparentIndex;
    125       return 0;
    126    case GLX_X_VISUAL_TYPE:
    127       *value_return = mode->visualType;
    128       return 0;
    129    case GLX_CONFIG_CAVEAT:
    130       *value_return = mode->visualRating;
    131       return 0;
    132    case GLX_VISUAL_ID:
    133       *value_return = mode->visualID;
    134       return 0;
    135    case GLX_DRAWABLE_TYPE:
    136       *value_return = mode->drawableType;
    137       return 0;
    138    case GLX_RENDER_TYPE:
    139       *value_return = mode->renderType;
    140       return 0;
    141    case GLX_X_RENDERABLE:
    142       *value_return = mode->xRenderable;
    143       return 0;
    144    case GLX_FBCONFIG_ID:
    145       *value_return = mode->fbconfigID;
    146       return 0;
    147    case GLX_MAX_PBUFFER_WIDTH:
    148       *value_return = mode->maxPbufferWidth;
    149       return 0;
    150    case GLX_MAX_PBUFFER_HEIGHT:
    151       *value_return = mode->maxPbufferHeight;
    152       return 0;
    153    case GLX_MAX_PBUFFER_PIXELS:
    154       *value_return = mode->maxPbufferPixels;
    155       return 0;
    156 #ifndef GLX_USE_APPLEGL               /* These aren't supported by CGL. */
    157    case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
    158       *value_return = mode->optimalPbufferWidth;
    159       return 0;
    160    case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
    161       *value_return = mode->optimalPbufferHeight;
    162       return 0;
    163    case GLX_SWAP_METHOD_OML:
    164       *value_return = mode->swapMethod;
    165       return 0;
    166 #endif
    167    case GLX_SAMPLE_BUFFERS_SGIS:
    168       *value_return = mode->sampleBuffers;
    169       return 0;
    170    case GLX_SAMPLES_SGIS:
    171       *value_return = mode->samples;
    172       return 0;
    173    case GLX_BIND_TO_TEXTURE_RGB_EXT:
    174       *value_return = mode->bindToTextureRgb;
    175       return 0;
    176    case GLX_BIND_TO_TEXTURE_RGBA_EXT:
    177       *value_return = mode->bindToTextureRgba;
    178       return 0;
    179    case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
    180       *value_return = mode->bindToMipmapTexture == GL_TRUE ? GL_TRUE :
    181          GL_FALSE;
    182       return 0;
    183    case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
    184       *value_return = mode->bindToTextureTargets;
    185       return 0;
    186    case GLX_Y_INVERTED_EXT:
    187       *value_return = mode->yInverted;
    188       return 0;
    189 
    190    case GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT:
    191       *value_return = mode->sRGBCapable;
    192       return 0;
    193 
    194       /* Applications are NOT allowed to query GLX_VISUAL_SELECT_GROUP_SGIX.
    195        * It is ONLY for communication between the GLX client and the GLX
    196        * server.
    197        */
    198    case GLX_VISUAL_SELECT_GROUP_SGIX:
    199    default:
    200       return GLX_BAD_ATTRIBUTE;
    201    }
    202 }
    203 
    204 
    205 /**
    206  * Allocate a linked list of \c struct glx_config structures.  The fields of
    207  * each structure will be initialized to "reasonable" default values.  In
    208  * most cases this is the default value defined by table 3.4 of the GLX
    209  * 1.3 specification.  This means that most values are either initialized to
    210  * zero or \c GLX_DONT_CARE (which is -1).  As support for additional
    211  * extensions is added, the new values will be initialized to appropriate
    212  * values from the extension specification.
    213  *
    214  * \param count         Number of structures to allocate.
    215  * \param minimum_size  Minimum size of a structure to allocate.  This allows
    216  *                      for differences in the version of the
    217  *                      \c struct glx_config stucture used in libGL and in a
    218  *                      DRI-based driver.
    219  * \returns A pointer to the first element in a linked list of \c count
    220  *          stuctures on success, or \c NULL on failure.
    221  */
    222 _X_HIDDEN struct glx_config *
    223 glx_config_create_list(unsigned count)
    224 {
    225    const size_t size = sizeof(struct glx_config);
    226    struct glx_config *base = NULL;
    227    struct glx_config **next;
    228    unsigned i;
    229 
    230    next = &base;
    231    for (i = 0; i < count; i++) {
    232       *next = malloc(size);
    233       if (*next == NULL) {
    234 	 glx_config_destroy_list(base);
    235 	 base = NULL;
    236 	 break;
    237       }
    238 
    239       (void) memset(*next, 0, size);
    240       (*next)->visualID = GLX_DONT_CARE;
    241       (*next)->visualType = GLX_DONT_CARE;
    242       (*next)->visualRating = GLX_NONE;
    243       (*next)->transparentPixel = GLX_NONE;
    244       (*next)->transparentRed = GLX_DONT_CARE;
    245       (*next)->transparentGreen = GLX_DONT_CARE;
    246       (*next)->transparentBlue = GLX_DONT_CARE;
    247       (*next)->transparentAlpha = GLX_DONT_CARE;
    248       (*next)->transparentIndex = GLX_DONT_CARE;
    249       (*next)->xRenderable = GLX_DONT_CARE;
    250       (*next)->fbconfigID = GLX_DONT_CARE;
    251       (*next)->swapMethod = GLX_SWAP_UNDEFINED_OML;
    252       (*next)->bindToTextureRgb = GLX_DONT_CARE;
    253       (*next)->bindToTextureRgba = GLX_DONT_CARE;
    254       (*next)->bindToMipmapTexture = GLX_DONT_CARE;
    255       (*next)->bindToTextureTargets = GLX_DONT_CARE;
    256       (*next)->yInverted = GLX_DONT_CARE;
    257       (*next)->sRGBCapable = GLX_DONT_CARE;
    258 
    259       next = &((*next)->next);
    260    }
    261 
    262    return base;
    263 }
    264 
    265 _X_HIDDEN void
    266 glx_config_destroy_list(struct glx_config *configs)
    267 {
    268    while (configs != NULL) {
    269       struct glx_config *const next = configs->next;
    270 
    271       free(configs);
    272       configs = next;
    273    }
    274 }
    275 
    276 
    277 /**
    278  * Find a context mode matching a Visual ID.
    279  *
    280  * \param modes  List list of context-mode structures to be searched.
    281  * \param vid    Visual ID to be found.
    282  * \returns A pointer to a context-mode in \c modes if \c vid was found in
    283  *          the list, or \c NULL if it was not.
    284  */
    285 
    286 _X_HIDDEN struct glx_config *
    287 glx_config_find_visual(struct glx_config *configs, int vid)
    288 {
    289    struct glx_config *c;
    290 
    291    for (c = configs; c != NULL; c = c->next)
    292       if (c->visualID == vid)
    293 	 return c;
    294 
    295    return NULL;
    296 }
    297 
    298 _X_HIDDEN struct glx_config *
    299 glx_config_find_fbconfig(struct glx_config *configs, int fbid)
    300 {
    301    struct glx_config *c;
    302 
    303    for (c = configs; c != NULL; c = c->next)
    304       if (c->fbconfigID == fbid)
    305 	 return c;
    306 
    307    return NULL;
    308 }
    309