Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  3.  * Copyright © 2008 Red Hat, Inc.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Soft-
  7.  * ware"), to deal in the Software without restriction, including without
  8.  * limitation the rights to use, copy, modify, merge, publish, distribute,
  9.  * and/or sell copies of the Software, and to permit persons to whom the
  10.  * Software is furnished to do so, provided that the above copyright
  11.  * notice(s) and this permission notice appear in all copies of the Soft-
  12.  * ware and that both the above copyright notice(s) and this permission
  13.  * notice appear in supporting documentation.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  17.  * ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
  18.  * RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
  19.  * THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSE-
  20.  * QUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21.  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22.  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFOR-
  23.  * MANCE OF THIS SOFTWARE.
  24.  *
  25.  * Except as contained in this notice, the name of a copyright holder shall
  26.  * not be used in advertising or otherwise to promote the sale, use or
  27.  * other dealings in this Software without prior written authorization of
  28.  * the copyright holder.
  29.  *
  30.  * Authors:
  31.  *   Kevin E. Martin <kevin@precisioninsight.com>
  32.  *   Brian Paul <brian@precisioninsight.com>
  33.  *   Kristian Høgsberg (krh@redhat.com)
  34.  */
  35.  
  36. #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
  37.  
  38. #include <unistd.h>
  39. #include <dlfcn.h>
  40. #include <stdarg.h>
  41. #include "glxclient.h"
  42. #include "dri_common.h"
  43.  
  44. #ifndef RTLD_NOW
  45. #define RTLD_NOW 0
  46. #endif
  47. #ifndef RTLD_GLOBAL
  48. #define RTLD_GLOBAL 0
  49. #endif
  50.  
  51. /**
  52.  * Print informational message to stderr if LIBGL_DEBUG is set to
  53.  * "verbose".
  54.  */
  55. _X_HIDDEN void
  56. InfoMessageF(const char *f, ...)
  57. {
  58.    va_list args;
  59.    const char *env;
  60.  
  61.    if ((env = getenv("LIBGL_DEBUG")) && strstr(env, "verbose")) {
  62.       fprintf(stderr, "libGL: ");
  63.       va_start(args, f);
  64.       vfprintf(stderr, f, args);
  65.       va_end(args);
  66.    }
  67. }
  68.  
  69. /**
  70.  * Print error message to stderr if LIBGL_DEBUG is set to anything but
  71.  * "quiet", (do nothing if LIBGL_DEBUG is unset).
  72.  */
  73. _X_HIDDEN void
  74. ErrorMessageF(const char *f, ...)
  75. {
  76.    va_list args;
  77.    const char *env;
  78.  
  79.    if ((env = getenv("LIBGL_DEBUG")) && !strstr(env, "quiet")) {
  80.       fprintf(stderr, "libGL error: ");
  81.       va_start(args, f);
  82.       vfprintf(stderr, f, args);
  83.       va_end(args);
  84.    }
  85. }
  86.  
  87. /**
  88.  * Print error message unless LIBGL_DEBUG is set to "quiet".
  89.  *
  90.  * The distinction between CriticalErrorMessageF and ErrorMessageF is
  91.  * that critcial errors will be printed by default, (even when
  92.  * LIBGL_DEBUG is unset).
  93.  */
  94. _X_HIDDEN void
  95. CriticalErrorMessageF(const char *f, ...)
  96. {
  97.    va_list args;
  98.    const char *env;
  99.  
  100.    if (!(env = getenv("LIBGL_DEBUG")) || !strstr(env, "quiet")) {
  101.       fprintf(stderr, "libGL error: ");
  102.       va_start(args, f);
  103.       vfprintf(stderr, f, args);
  104.       va_end(args);
  105.  
  106.       if (!env || !strstr(env, "verbose"))
  107.          fprintf(stderr, "libGL error: Try again with LIBGL_DEBUG=verbose for more details.\n");
  108.    }
  109. }
  110.  
  111. #ifndef DEFAULT_DRIVER_DIR
  112. /* this is normally defined in Mesa/configs/default with DRI_DRIVER_SEARCH_PATH */
  113. #define DEFAULT_DRIVER_DIR "/usr/local/lib/dri"
  114. #endif
  115.  
  116. /**
  117.  * Try to \c dlopen the named driver.
  118.  *
  119.  * This function adds the "_dri.so" suffix to the driver name and searches the
  120.  * directories specified by the \c LIBGL_DRIVERS_PATH environment variable in
  121.  * order to find the driver.
  122.  *
  123.  * \param driverName - a name like "i965", "radeon", "nouveau", etc.
  124.  *
  125.  * \returns
  126.  * A handle from \c dlopen, or \c NULL if driver file not found.
  127.  */
  128. _X_HIDDEN void *
  129. driOpenDriver(const char *driverName)
  130. {
  131.    void *glhandle, *handle;
  132.    const char *libPaths, *p, *next;
  133.    char realDriverName[200];
  134.    int len;
  135.  
  136.    /* Attempt to make sure libGL symbols will be visible to the driver */
  137.    glhandle = dlopen("libGL.so.1", RTLD_NOW | RTLD_GLOBAL);
  138.  
  139.    libPaths = NULL;
  140.    if (geteuid() == getuid()) {
  141.       /* don't allow setuid apps to use LIBGL_DRIVERS_PATH */
  142.       libPaths = getenv("LIBGL_DRIVERS_PATH");
  143.       if (!libPaths)
  144.          libPaths = getenv("LIBGL_DRIVERS_DIR");        /* deprecated */
  145.    }
  146.    if (libPaths == NULL)
  147.       libPaths = DEFAULT_DRIVER_DIR;
  148.  
  149.    handle = NULL;
  150.    for (p = libPaths; *p; p = next) {
  151.       next = strchr(p, ':');
  152.       if (next == NULL) {
  153.          len = strlen(p);
  154.          next = p + len;
  155.       }
  156.       else {
  157.          len = next - p;
  158.          next++;
  159.       }
  160.  
  161. #ifdef GLX_USE_TLS
  162.       snprintf(realDriverName, sizeof realDriverName,
  163.                "%.*s/tls/%s_dri.so", len, p, driverName);
  164.       InfoMessageF("OpenDriver: trying %s\n", realDriverName);
  165.       handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
  166. #endif
  167.  
  168.       if (handle == NULL) {
  169.          snprintf(realDriverName, sizeof realDriverName,
  170.                   "%.*s/%s_dri.so", len, p, driverName);
  171.          InfoMessageF("OpenDriver: trying %s\n", realDriverName);
  172.          handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
  173.       }
  174.  
  175.       if (handle != NULL)
  176.          break;
  177.       else
  178.          ErrorMessageF("dlopen %s failed (%s)\n", realDriverName, dlerror());
  179.    }
  180.  
  181.    if (!handle)
  182.       ErrorMessageF("unable to load driver: %s_dri.so\n", driverName);
  183.  
  184.    if (glhandle)
  185.       dlclose(glhandle);
  186.  
  187.    return handle;
  188. }
  189.  
  190. static GLboolean
  191. __driGetMSCRate(__DRIdrawable *draw,
  192.                 int32_t * numerator, int32_t * denominator,
  193.                 void *loaderPrivate)
  194. {
  195.    __GLXDRIdrawable *glxDraw = loaderPrivate;
  196.  
  197.    return __glxGetMscRate(glxDraw, numerator, denominator);
  198. }
  199.  
  200. _X_HIDDEN const __DRIsystemTimeExtension systemTimeExtension = {
  201.    {__DRI_SYSTEM_TIME, __DRI_SYSTEM_TIME_VERSION},
  202.    __glXGetUST,
  203.    __driGetMSCRate
  204. };
  205.  
  206. #define __ATTRIB(attrib, field) \
  207.     { attrib, offsetof(struct glx_config, field) }
  208.  
  209. static const struct
  210. {
  211.    unsigned int attrib, offset;
  212. } attribMap[] = {
  213.    __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE, rgbBits),
  214.       __ATTRIB(__DRI_ATTRIB_LEVEL, level),
  215.       __ATTRIB(__DRI_ATTRIB_RED_SIZE, redBits),
  216.       __ATTRIB(__DRI_ATTRIB_GREEN_SIZE, greenBits),
  217.       __ATTRIB(__DRI_ATTRIB_BLUE_SIZE, blueBits),
  218.       __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE, alphaBits),
  219.       __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE, depthBits),
  220.       __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE, stencilBits),
  221.       __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE, accumRedBits),
  222.       __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE, accumGreenBits),
  223.       __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE, accumBlueBits),
  224.       __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE, accumAlphaBits),
  225.       __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS, sampleBuffers),
  226.       __ATTRIB(__DRI_ATTRIB_SAMPLES, samples),
  227.       __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER, doubleBufferMode),
  228.       __ATTRIB(__DRI_ATTRIB_STEREO, stereoMode),
  229.       __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS, numAuxBuffers),
  230. #if 0
  231.       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE, transparentPixel),
  232.       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE, transparentIndex),
  233.       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE, transparentRed),
  234.       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE, transparentGreen),
  235.       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE, transparentBlue),
  236.       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE, transparentAlpha),
  237.       __ATTRIB(__DRI_ATTRIB_RED_MASK, redMask),
  238.       __ATTRIB(__DRI_ATTRIB_GREEN_MASK, greenMask),
  239.       __ATTRIB(__DRI_ATTRIB_BLUE_MASK, blueMask),
  240.       __ATTRIB(__DRI_ATTRIB_ALPHA_MASK, alphaMask),
  241. #endif
  242.       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH, maxPbufferWidth),
  243.       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT, maxPbufferHeight),
  244.       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS, maxPbufferPixels),
  245.       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH, optimalPbufferWidth),
  246.       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT, optimalPbufferHeight),
  247. #if 0
  248.       __ATTRIB(__DRI_ATTRIB_SWAP_METHOD, swapMethod),
  249. #endif
  250. __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB, bindToTextureRgb),
  251.       __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA, bindToTextureRgba),
  252.       __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,
  253.                      bindToMipmapTexture),
  254.       __ATTRIB(__DRI_ATTRIB_YINVERTED, yInverted),
  255.       __ATTRIB(__DRI_ATTRIB_FRAMEBUFFER_SRGB_CAPABLE, sRGBCapable)
  256. };
  257.  
  258. static int
  259. scalarEqual(struct glx_config *mode, unsigned int attrib, unsigned int value)
  260. {
  261.    unsigned int glxValue;
  262.    int i;
  263.  
  264.    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
  265.       if (attribMap[i].attrib == attrib) {
  266.          glxValue = *(unsigned int *) ((char *) mode + attribMap[i].offset);
  267.          return glxValue == GLX_DONT_CARE || glxValue == value;
  268.       }
  269.  
  270.    return GL_TRUE;              /* Is a non-existing attribute equal to value? */
  271. }
  272.  
  273. static int
  274. driConfigEqual(const __DRIcoreExtension *core,
  275.                struct glx_config *config, const __DRIconfig *driConfig)
  276. {
  277.    unsigned int attrib, value, glxValue;
  278.    int i;
  279.  
  280.    i = 0;
  281.    while (core->indexConfigAttrib(driConfig, i++, &attrib, &value)) {
  282.       switch (attrib) {
  283.       case __DRI_ATTRIB_RENDER_TYPE:
  284.          glxValue = 0;
  285.          if (value & __DRI_ATTRIB_RGBA_BIT) {
  286.             glxValue |= GLX_RGBA_BIT;
  287.          }
  288.          if (value & __DRI_ATTRIB_COLOR_INDEX_BIT) {
  289.             glxValue |= GLX_COLOR_INDEX_BIT;
  290.          }
  291.          if (value & __DRI_ATTRIB_FLOAT_BIT) {
  292.             glxValue |= GLX_RGBA_FLOAT_BIT_ARB;
  293.          }
  294.          if (value & __DRI_ATTRIB_UNSIGNED_FLOAT_BIT) {
  295.             glxValue |= GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT;
  296.          }
  297.          if (glxValue != config->renderType)
  298.             return GL_FALSE;
  299.          break;
  300.  
  301.       case __DRI_ATTRIB_CONFIG_CAVEAT:
  302.          if (value & __DRI_ATTRIB_NON_CONFORMANT_CONFIG)
  303.             glxValue = GLX_NON_CONFORMANT_CONFIG;
  304.          else if (value & __DRI_ATTRIB_SLOW_BIT)
  305.             glxValue = GLX_SLOW_CONFIG;
  306.          else
  307.             glxValue = GLX_NONE;
  308.          if (glxValue != config->visualRating)
  309.             return GL_FALSE;
  310.          break;
  311.  
  312.       case __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS:
  313.          glxValue = 0;
  314.          if (value & __DRI_ATTRIB_TEXTURE_1D_BIT)
  315.             glxValue |= GLX_TEXTURE_1D_BIT_EXT;
  316.          if (value & __DRI_ATTRIB_TEXTURE_2D_BIT)
  317.             glxValue |= GLX_TEXTURE_2D_BIT_EXT;
  318.          if (value & __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT)
  319.             glxValue |= GLX_TEXTURE_RECTANGLE_BIT_EXT;
  320.          if (config->bindToTextureTargets != GLX_DONT_CARE &&
  321.              glxValue != config->bindToTextureTargets)
  322.             return GL_FALSE;
  323.          break;
  324.  
  325.       default:
  326.          if (!scalarEqual(config, attrib, value))
  327.             return GL_FALSE;
  328.       }
  329.    }
  330.  
  331.    return GL_TRUE;
  332. }
  333.  
  334. static struct glx_config *
  335. createDriMode(const __DRIcoreExtension * core,
  336.               struct glx_config *config, const __DRIconfig **driConfigs)
  337. {
  338.    __GLXDRIconfigPrivate *driConfig;
  339.    int i;
  340.  
  341.    for (i = 0; driConfigs[i]; i++) {
  342.       if (driConfigEqual(core, config, driConfigs[i]))
  343.          break;
  344.    }
  345.  
  346.    if (driConfigs[i] == NULL)
  347.       return NULL;
  348.  
  349.    driConfig = malloc(sizeof *driConfig);
  350.    if (driConfig == NULL)
  351.       return NULL;
  352.  
  353.    driConfig->base = *config;
  354.    driConfig->driConfig = driConfigs[i];
  355.  
  356.    return &driConfig->base;
  357. }
  358.  
  359. _X_HIDDEN struct glx_config *
  360. driConvertConfigs(const __DRIcoreExtension * core,
  361.                   struct glx_config *configs, const __DRIconfig **driConfigs)
  362. {
  363.    struct glx_config head, *tail, *m;
  364.  
  365.    tail = &head;
  366.    head.next = NULL;
  367.    for (m = configs; m; m = m->next) {
  368.       tail->next = createDriMode(core, m, driConfigs);
  369.       if (tail->next == NULL) {
  370.          /* no matching dri config for m */
  371.          continue;
  372.       }
  373.  
  374.  
  375.       tail = tail->next;
  376.    }
  377.  
  378.    return head.next;
  379. }
  380.  
  381. _X_HIDDEN void
  382. driDestroyConfigs(const __DRIconfig **configs)
  383. {
  384.    int i;
  385.  
  386.    for (i = 0; configs[i]; i++)
  387.       free((__DRIconfig *) configs[i]);
  388.    free(configs);
  389. }
  390.  
  391. _X_HIDDEN __GLXDRIdrawable *
  392. driFetchDrawable(struct glx_context *gc, GLXDrawable glxDrawable)
  393. {
  394.    struct glx_display *const priv = __glXInitialize(gc->psc->dpy);
  395.    __GLXDRIdrawable *pdraw;
  396.    struct glx_screen *psc;
  397.  
  398.    if (priv == NULL)
  399.       return NULL;
  400.  
  401.    psc = priv->screens[gc->screen];
  402.    if (priv->drawHash == NULL)
  403.       return NULL;
  404.  
  405.    if (__glxHashLookup(priv->drawHash, glxDrawable, (void *) &pdraw) == 0) {
  406.       pdraw->refcount ++;
  407.       return pdraw;
  408.    }
  409.  
  410.    pdraw = psc->driScreen->createDrawable(psc, glxDrawable,
  411.                                           glxDrawable, gc->config);
  412.  
  413.    if (pdraw == NULL) {
  414.       ErrorMessageF("failed to create drawable\n");
  415.       return NULL;
  416.    }
  417.  
  418.    if (__glxHashInsert(priv->drawHash, glxDrawable, pdraw)) {
  419.       (*pdraw->destroyDrawable) (pdraw);
  420.       return NULL;
  421.    }
  422.    pdraw->refcount = 1;
  423.  
  424.    return pdraw;
  425. }
  426.  
  427. _X_HIDDEN void
  428. driReleaseDrawables(struct glx_context *gc)
  429. {
  430.    const struct glx_display *priv = gc->psc->display;
  431.    __GLXDRIdrawable *pdraw;
  432.  
  433.    if (priv == NULL)
  434.       return;
  435.  
  436.    if (__glxHashLookup(priv->drawHash,
  437.                        gc->currentDrawable, (void *) &pdraw) == 0) {
  438.       if (pdraw->drawable == pdraw->xDrawable) {
  439.          pdraw->refcount --;
  440.          if (pdraw->refcount == 0) {
  441.             (*pdraw->destroyDrawable)(pdraw);
  442.             __glxHashDelete(priv->drawHash, gc->currentDrawable);
  443.          }
  444.       }
  445.    }
  446.  
  447.    if (__glxHashLookup(priv->drawHash,
  448.                        gc->currentReadable, (void *) &pdraw) == 0) {
  449.       if (pdraw->drawable == pdraw->xDrawable) {
  450.          pdraw->refcount --;
  451.          if (pdraw->refcount == 0) {
  452.             (*pdraw->destroyDrawable)(pdraw);
  453.             __glxHashDelete(priv->drawHash, gc->currentReadable);
  454.          }
  455.       }
  456.    }
  457.  
  458.    gc->currentDrawable = None;
  459.    gc->currentReadable = None;
  460.  
  461. }
  462.  
  463. _X_HIDDEN bool
  464. dri2_convert_glx_attribs(unsigned num_attribs, const uint32_t *attribs,
  465.                          unsigned *major_ver, unsigned *minor_ver,
  466.                          uint32_t *render_type, uint32_t *flags, unsigned *api,
  467.                          int *reset, unsigned *error)
  468. {
  469.    unsigned i;
  470.    bool got_profile = false;
  471.    uint32_t profile;
  472.  
  473.    *major_ver = 1;
  474.    *minor_ver = 0;
  475.    *render_type = GLX_RGBA_TYPE;
  476.    *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
  477.    *flags = 0;
  478.    *api = __DRI_API_OPENGL;
  479.  
  480.    if (num_attribs == 0) {
  481.       return true;
  482.    }
  483.  
  484.    /* This is actually an internal error, but what the heck.
  485.     */
  486.    if (attribs == NULL) {
  487.       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
  488.       return false;
  489.    }
  490.  
  491.    for (i = 0; i < num_attribs; i++) {
  492.       switch (attribs[i * 2]) {
  493.       case GLX_CONTEXT_MAJOR_VERSION_ARB:
  494.          *major_ver = attribs[i * 2 + 1];
  495.          break;
  496.       case GLX_CONTEXT_MINOR_VERSION_ARB:
  497.          *minor_ver = attribs[i * 2 + 1];
  498.          break;
  499.       case GLX_CONTEXT_FLAGS_ARB:
  500.          *flags = attribs[i * 2 + 1];
  501.          break;
  502.       case GLX_CONTEXT_PROFILE_MASK_ARB:
  503.          profile = attribs[i * 2 + 1];
  504.          got_profile = true;
  505.          break;
  506.       case GLX_RENDER_TYPE:
  507.          *render_type = attribs[i * 2 + 1];
  508.          break;
  509.       case GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB:
  510.          switch (attribs[i * 2 + 1]) {
  511.          case GLX_NO_RESET_NOTIFICATION_ARB:
  512.             *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
  513.             break;
  514.          case GLX_LOSE_CONTEXT_ON_RESET_ARB:
  515.             *reset = __DRI_CTX_RESET_LOSE_CONTEXT;
  516.             break;
  517.          default:
  518.             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
  519.             return false;
  520.          }
  521.          break;
  522.       default:
  523.          /* If an unknown attribute is received, fail.
  524.           */
  525.          *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
  526.          return false;
  527.       }
  528.    }
  529.  
  530.    if (!got_profile) {
  531.       if (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
  532.          *api = __DRI_API_OPENGL_CORE;
  533.    } else {
  534.       switch (profile) {
  535.       case GLX_CONTEXT_CORE_PROFILE_BIT_ARB:
  536.          /* There are no profiles before OpenGL 3.2.  The
  537.           * GLX_ARB_create_context_profile spec says:
  538.           *
  539.           *     "If the requested OpenGL version is less than 3.2,
  540.           *     GLX_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
  541.           *     of the context is determined solely by the requested version."
  542.           */
  543.          *api = (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
  544.             ? __DRI_API_OPENGL_CORE : __DRI_API_OPENGL;
  545.          break;
  546.       case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
  547.          *api = __DRI_API_OPENGL;
  548.          break;
  549.       case GLX_CONTEXT_ES2_PROFILE_BIT_EXT:
  550.          *api = __DRI_API_GLES2;
  551.          break;
  552.       default:
  553.          *error = __DRI_CTX_ERROR_BAD_API;
  554.          return false;
  555.       }
  556.    }
  557.  
  558.    /* Unknown flag value.
  559.     */
  560.    if (*flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
  561.                   | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS)) {
  562.       *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
  563.       return false;
  564.    }
  565.  
  566.    /* There are no forward-compatible contexts before OpenGL 3.0.  The
  567.     * GLX_ARB_create_context spec says:
  568.     *
  569.     *     "Forward-compatible contexts are defined only for OpenGL versions
  570.     *     3.0 and later."
  571.     */
  572.    if (*major_ver < 3 && (*flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
  573.       *error = __DRI_CTX_ERROR_BAD_FLAG;
  574.       return false;
  575.    }
  576.  
  577.    if (*major_ver >= 3 && *render_type == GLX_COLOR_INDEX_TYPE) {
  578.       *error = __DRI_CTX_ERROR_BAD_FLAG;
  579.       return false;
  580.    }
  581.  
  582.    /* The GLX_EXT_create_context_es2_profile spec says:
  583.     *
  584.     *     "... If the version requested is 2.0, and the
  585.     *     GLX_CONTEXT_ES2_PROFILE_BIT_EXT bit is set in the
  586.     *     GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context
  587.     *     returned will implement OpenGL ES 2.0. This is the only way in which
  588.     *     an implementation may request an OpenGL ES 2.0 context."
  589.     */
  590.    if (*api == __DRI_API_GLES2 && (*major_ver != 2 || *minor_ver != 0)) {
  591.       *error = __DRI_CTX_ERROR_BAD_API;
  592.       return false;
  593.    }
  594.  
  595.    *error = __DRI_CTX_ERROR_SUCCESS;
  596.    return true;
  597. }
  598.  
  599. #endif /* GLX_DIRECT_RENDERING */
  600.