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  1. /*
  2.  * (C) Copyright IBM Corporation 2002, 2004
  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.  * THE AUTHORS 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 dri_util.c
  27.  * DRI utility functions.
  28.  *
  29.  * This module acts as glue between GLX and the actual hardware driver.  A DRI
  30.  * driver doesn't really \e have to use any of this - it's optional.  But, some
  31.  * useful stuff is done here that otherwise would have to be duplicated in most
  32.  * drivers.
  33.  *
  34.  * Basically, these utility functions take care of some of the dirty details of
  35.  * screen initialization, context creation, context binding, DRM setup, etc.
  36.  *
  37.  * These functions are compiled into each DRI driver so libGL.so knows nothing
  38.  * about them.
  39.  */
  40.  
  41.  
  42. #include <stdbool.h>
  43. #ifndef __NOT_HAVE_DRM_H
  44. #include <xf86drm.h>
  45. #endif
  46. #include "dri_util.h"
  47. #include "utils.h"
  48. #include "xmlpool.h"
  49. #include "../glsl/glsl_parser_extras.h"
  50. #include "main/mtypes.h"
  51. #include "main/version.h"
  52. #include "main/errors.h"
  53. #include "main/macros.h"
  54.  
  55. const char __dri2ConfigOptions[] =
  56.    DRI_CONF_BEGIN
  57.       DRI_CONF_SECTION_PERFORMANCE
  58.          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  59.       DRI_CONF_SECTION_END
  60.    DRI_CONF_END;
  61.  
  62. /*****************************************************************/
  63. /** \name Screen handling functions                              */
  64. /*****************************************************************/
  65. /*@{*/
  66.  
  67. static void
  68. setupLoaderExtensions(__DRIscreen *psp,
  69.                       const __DRIextension **extensions)
  70. {
  71.     int i;
  72.  
  73.     for (i = 0; extensions[i]; i++) {
  74.         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
  75.             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
  76.         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
  77.             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
  78.         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
  79.             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
  80.         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  81.             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  82.         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOADER) == 0)
  83.            psp->image.loader = (__DRIimageLoaderExtension *) extensions[i];
  84.     }
  85. }
  86.  
  87. /**
  88.  * This pointer determines which driver API we'll use in the case of the
  89.  * loader not passing us an explicit driver extensions list (that would,
  90.  * itself, contain a pointer to a driver API.)
  91.  *
  92.  * A driver's driDriverGetExtensions_drivername() can update this pointer to
  93.  * what it's returning, and a loader that is ignorant of createNewScreen2()
  94.  * will get the correct driver screen created, as long as no other
  95.  * driDriverGetExtensions() happened in between the first one and the
  96.  * createNewScreen().
  97.  *
  98.  * This allows the X Server to not require the significant dri_interface.h
  99.  * updates for doing createNewScreen2(), which would discourage backporting of
  100.  * the X Server patches to support the new loader interface.
  101.  */
  102. const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI;
  103.  
  104. /**
  105.  * This is the first entrypoint in the driver called by the DRI driver loader
  106.  * after dlopen()ing it.
  107.  *
  108.  * It's used to create global state for the driver across contexts on the same
  109.  * Display.
  110.  */
  111. static __DRIscreen *
  112. driCreateNewScreen2(int scrn, int fd,
  113.                     const __DRIextension **extensions,
  114.                     const __DRIextension **driver_extensions,
  115.                     const __DRIconfig ***driver_configs, void *data)
  116. {
  117.     static const __DRIextension *emptyExtensionList[] = { NULL };
  118.     __DRIscreen *psp;
  119.  
  120.     psp = calloc(1, sizeof(*psp));
  121.     if (!psp)
  122.         return NULL;
  123.  
  124.     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
  125.     psp->driver = globalDriverAPI;
  126.  
  127.     /* If the driver exposes its vtable through its extensions list
  128.      * (megadrivers), use that instead.
  129.      */
  130.     if (driver_extensions) {
  131.        for (int i = 0; driver_extensions[i]; i++) {
  132.           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
  133.              psp->driver =
  134.                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
  135.           }
  136.        }
  137.     }
  138.  
  139.     setupLoaderExtensions(psp, extensions);
  140.  
  141. #ifndef __NOT_HAVE_DRM_H
  142.     if (fd != -1) {
  143.        drmVersionPtr version = drmGetVersion(fd);
  144.        if (version) {
  145.           psp->drm_version.major = version->version_major;
  146.           psp->drm_version.minor = version->version_minor;
  147.           psp->drm_version.patch = version->version_patchlevel;
  148.           drmFreeVersion(version);
  149.        }
  150.     }
  151. #endif
  152.  
  153.     psp->loaderPrivate = data;
  154.  
  155.     psp->extensions = emptyExtensionList;
  156.     psp->fd = fd;
  157.     psp->myNum = scrn;
  158.  
  159.     *driver_configs = psp->driver->InitScreen(psp);
  160.     if (*driver_configs == NULL) {
  161.         free(psp);
  162.         return NULL;
  163.     }
  164.  
  165.     int gl_version_override = _mesa_get_gl_version_override();
  166.     if (gl_version_override >= 31) {
  167.        psp->max_gl_core_version = MAX2(psp->max_gl_core_version,
  168.                                        gl_version_override);
  169.     } else {
  170.        psp->max_gl_compat_version = MAX2(psp->max_gl_compat_version,
  171.                                          gl_version_override);
  172.     }
  173.  
  174.     psp->api_mask = (1 << __DRI_API_OPENGL);
  175.     if (psp->max_gl_core_version > 0)
  176.        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
  177.     if (psp->max_gl_es1_version > 0)
  178.        psp->api_mask |= (1 << __DRI_API_GLES);
  179.     if (psp->max_gl_es2_version > 0)
  180.        psp->api_mask |= (1 << __DRI_API_GLES2);
  181.     if (psp->max_gl_es2_version >= 30)
  182.        psp->api_mask |= (1 << __DRI_API_GLES3);
  183.  
  184.     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
  185.     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
  186.  
  187.  
  188.     return psp;
  189. }
  190.  
  191. static __DRIscreen *
  192. dri2CreateNewScreen(int scrn, int fd,
  193.                     const __DRIextension **extensions,
  194.                     const __DRIconfig ***driver_configs, void *data)
  195. {
  196.    return driCreateNewScreen2(scrn, fd, extensions, NULL,
  197.                                driver_configs, data);
  198. }
  199.  
  200. /** swrast driver createNewScreen entrypoint. */
  201. static __DRIscreen *
  202. driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
  203.                          const __DRIconfig ***driver_configs, void *data)
  204. {
  205.    return driCreateNewScreen2(scrn, -1, extensions, NULL,
  206.                                driver_configs, data);
  207. }
  208.  
  209. static __DRIscreen *
  210. driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
  211.                           const __DRIextension **driver_extensions,
  212.                           const __DRIconfig ***driver_configs, void *data)
  213. {
  214.    return driCreateNewScreen2(scrn, -1, extensions, driver_extensions,
  215.                                driver_configs, data);
  216. }
  217.  
  218. /**
  219.  * Destroy the per-screen private information.
  220.  *
  221.  * \internal
  222.  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
  223.  * drmClose(), and finally frees \p screenPrivate.
  224.  */
  225. static void driDestroyScreen(__DRIscreen *psp)
  226. {
  227.     if (psp) {
  228.         /* No interaction with the X-server is possible at this point.  This
  229.          * routine is called after XCloseDisplay, so there is no protocol
  230.          * stream open to the X-server anymore.
  231.          */
  232.  
  233.        _mesa_destroy_shader_compiler();
  234.  
  235.         psp->driver->DestroyScreen(psp);
  236.  
  237.         driDestroyOptionCache(&psp->optionCache);
  238.         driDestroyOptionInfo(&psp->optionInfo);
  239.  
  240.         free(psp);
  241.     }
  242. }
  243.  
  244. static const __DRIextension **driGetExtensions(__DRIscreen *psp)
  245. {
  246.     return psp->extensions;
  247. }
  248.  
  249. /*@}*/
  250.  
  251.  
  252. static bool
  253. validate_context_version(__DRIscreen *screen,
  254.                          int mesa_api,
  255.                          unsigned major_version,
  256.                          unsigned minor_version,
  257.                          unsigned *dri_ctx_error)
  258. {
  259.    unsigned req_version = 10 * major_version + minor_version;
  260.    unsigned max_version = 0;
  261.  
  262.    switch (mesa_api) {
  263.    case API_OPENGL_COMPAT:
  264.       max_version = screen->max_gl_compat_version;
  265.       break;
  266.    case API_OPENGL_CORE:
  267.       max_version = screen->max_gl_core_version;
  268.       break;
  269.    case API_OPENGLES:
  270.       max_version = screen->max_gl_es1_version;
  271.       break;
  272.    case API_OPENGLES2:
  273.       max_version = screen->max_gl_es2_version;
  274.       break;
  275.    default:
  276.       max_version = 0;
  277.       break;
  278.    }
  279.  
  280.    if (max_version == 0) {
  281.       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
  282.       return false;
  283.    } else if (req_version > max_version) {
  284.       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
  285.       return false;
  286.    }
  287.  
  288.    return true;
  289. }
  290.  
  291. /*****************************************************************/
  292. /** \name Context handling functions                             */
  293. /*****************************************************************/
  294. /*@{*/
  295.  
  296. static __DRIcontext *
  297. driCreateContextAttribs(__DRIscreen *screen, int api,
  298.                         const __DRIconfig *config,
  299.                         __DRIcontext *shared,
  300.                         unsigned num_attribs,
  301.                         const uint32_t *attribs,
  302.                         unsigned *error,
  303.                         void *data)
  304. {
  305.     __DRIcontext *context;
  306.     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
  307.     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
  308.     gl_api mesa_api;
  309.     unsigned major_version = 1;
  310.     unsigned minor_version = 0;
  311.     uint32_t flags = 0;
  312.     bool notify_reset = false;
  313.  
  314.     assert((num_attribs == 0) || (attribs != NULL));
  315.  
  316.     if (!(screen->api_mask & (1 << api))) {
  317.         *error = __DRI_CTX_ERROR_BAD_API;
  318.         return NULL;
  319.     }
  320.  
  321.     switch (api) {
  322.     case __DRI_API_OPENGL:
  323.         mesa_api = API_OPENGL_COMPAT;
  324.         break;
  325.     case __DRI_API_GLES:
  326.         mesa_api = API_OPENGLES;
  327.         break;
  328.     case __DRI_API_GLES2:
  329.     case __DRI_API_GLES3:
  330.         mesa_api = API_OPENGLES2;
  331.         break;
  332.     case __DRI_API_OPENGL_CORE:
  333.         mesa_api = API_OPENGL_CORE;
  334.         break;
  335.     default:
  336.         *error = __DRI_CTX_ERROR_BAD_API;
  337.         return NULL;
  338.     }
  339.  
  340.     for (unsigned i = 0; i < num_attribs; i++) {
  341.         switch (attribs[i * 2]) {
  342.         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
  343.             major_version = attribs[i * 2 + 1];
  344.             break;
  345.         case __DRI_CTX_ATTRIB_MINOR_VERSION:
  346.             minor_version = attribs[i * 2 + 1];
  347.             break;
  348.         case __DRI_CTX_ATTRIB_FLAGS:
  349.             flags = attribs[i * 2 + 1];
  350.             break;
  351.         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
  352.             notify_reset = (attribs[i * 2 + 1]
  353.                             != __DRI_CTX_RESET_NO_NOTIFICATION);
  354.             break;
  355.         default:
  356.             /* We can't create a context that satisfies the requirements of an
  357.              * attribute that we don't understand.  Return failure.
  358.              */
  359.             assert(!"Should not get here.");
  360.             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
  361.             return NULL;
  362.         }
  363.     }
  364.  
  365.     /* Mesa does not support the GL_ARB_compatibilty extension or the
  366.      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
  367.      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
  368.      */
  369.     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
  370.        mesa_api = API_OPENGL_CORE;
  371.  
  372.     if (mesa_api == API_OPENGL_COMPAT
  373.         && ((major_version > 3)
  374.             || (major_version == 3 && minor_version >= 2))) {
  375.        *error = __DRI_CTX_ERROR_BAD_API;
  376.        return NULL;
  377.     }
  378.  
  379.     /* The latest version of EGL_KHR_create_context spec says:
  380.      *
  381.      *     "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
  382.      *     EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
  383.      *     [...] This bit is supported for OpenGL and OpenGL ES contexts.
  384.      *
  385.      * None of the other flags have any meaning in an ES context, so this seems safe.
  386.      */
  387.     if (mesa_api != API_OPENGL_COMPAT
  388.         && mesa_api != API_OPENGL_CORE
  389.         && (flags & ~__DRI_CTX_FLAG_DEBUG)) {
  390.         *error = __DRI_CTX_ERROR_BAD_FLAG;
  391.         return NULL;
  392.     }
  393.  
  394.     /* There are no forward-compatible contexts before OpenGL 3.0.  The
  395.      * GLX_ARB_create_context spec says:
  396.      *
  397.      *     "Forward-compatible contexts are defined only for OpenGL versions
  398.      *     3.0 and later."
  399.      *
  400.      * Forward-looking contexts are supported by silently converting the
  401.      * requested API to API_OPENGL_CORE.
  402.      *
  403.      * In Mesa, a debug context is the same as a regular context.
  404.      */
  405.     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
  406.        mesa_api = API_OPENGL_CORE;
  407.     }
  408.  
  409.     const uint32_t allowed_flags = (__DRI_CTX_FLAG_DEBUG
  410.                                     | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
  411.                                     | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS);
  412.     if (flags & ~allowed_flags) {
  413.         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
  414.         return NULL;
  415.     }
  416.  
  417.     if (!validate_context_version(screen, mesa_api,
  418.                                   major_version, minor_version, error))
  419.        return NULL;
  420.  
  421.     context = calloc(1, sizeof *context);
  422.     if (!context) {
  423.         *error = __DRI_CTX_ERROR_NO_MEMORY;
  424.         return NULL;
  425.     }
  426.  
  427.     context->loaderPrivate = data;
  428.  
  429.     context->driScreenPriv = screen;
  430.     context->driDrawablePriv = NULL;
  431.     context->driReadablePriv = NULL;
  432.  
  433.     if (!screen->driver->CreateContext(mesa_api, modes, context,
  434.                                        major_version, minor_version,
  435.                                        flags, notify_reset, error, shareCtx)) {
  436.         free(context);
  437.         return NULL;
  438.     }
  439.  
  440.     *error = __DRI_CTX_ERROR_SUCCESS;
  441.     return context;
  442. }
  443.  
  444. void
  445. driContextSetFlags(struct gl_context *ctx, uint32_t flags)
  446. {
  447.     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
  448.         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
  449.     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
  450.        _mesa_set_debug_state_int(ctx, GL_DEBUG_OUTPUT, GL_TRUE);
  451.         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
  452.     }
  453. }
  454.  
  455. static __DRIcontext *
  456. driCreateNewContextForAPI(__DRIscreen *screen, int api,
  457.                           const __DRIconfig *config,
  458.                           __DRIcontext *shared, void *data)
  459. {
  460.     unsigned error;
  461.  
  462.     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
  463.                                    &error, data);
  464. }
  465.  
  466. static __DRIcontext *
  467. driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
  468.                     __DRIcontext *shared, void *data)
  469. {
  470.     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
  471.                                      config, shared, data);
  472. }
  473.  
  474. /**
  475.  * Destroy the per-context private information.
  476.  *
  477.  * \internal
  478.  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
  479.  * drmDestroyContext(), and finally frees \p contextPrivate.
  480.  */
  481. static void
  482. driDestroyContext(__DRIcontext *pcp)
  483. {
  484.     if (pcp) {
  485.         pcp->driScreenPriv->driver->DestroyContext(pcp);
  486.         free(pcp);
  487.     }
  488. }
  489.  
  490. static int
  491. driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
  492. {
  493.     (void) dest;
  494.     (void) src;
  495.     (void) mask;
  496.     return GL_FALSE;
  497. }
  498.  
  499. /*@}*/
  500.  
  501.  
  502. /*****************************************************************/
  503. /** \name Context (un)binding functions                          */
  504. /*****************************************************************/
  505. /*@{*/
  506.  
  507. static void dri_get_drawable(__DRIdrawable *pdp);
  508. static void dri_put_drawable(__DRIdrawable *pdp);
  509.  
  510. /**
  511.  * This function takes both a read buffer and a draw buffer.  This is needed
  512.  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
  513.  * function.
  514.  */
  515. static int driBindContext(__DRIcontext *pcp,
  516.                           __DRIdrawable *pdp,
  517.                           __DRIdrawable *prp)
  518. {
  519.     /*
  520.     ** Assume error checking is done properly in glXMakeCurrent before
  521.     ** calling driUnbindContext.
  522.     */
  523.  
  524.     if (!pcp)
  525.         return GL_FALSE;
  526.  
  527.     /* Bind the drawable to the context */
  528.     pcp->driDrawablePriv = pdp;
  529.     pcp->driReadablePriv = prp;
  530.     if (pdp) {
  531.         pdp->driContextPriv = pcp;
  532.         dri_get_drawable(pdp);
  533.     }
  534.     if (prp && pdp != prp) {
  535.         dri_get_drawable(prp);
  536.     }
  537.  
  538.     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
  539. }
  540.  
  541. /**
  542.  * Unbind context.
  543.  *
  544.  * \param scrn the screen.
  545.  * \param gc context.
  546.  *
  547.  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
  548.  *
  549.  * \internal
  550.  * This function calls __DriverAPIRec::UnbindContext, and then decrements
  551.  * __DRIdrawableRec::refcount which must be non-zero for a successful
  552.  * return.
  553.  *
  554.  * While casting the opaque private pointers associated with the parameters
  555.  * into their respective real types it also assures they are not \c NULL.
  556.  */
  557. static int driUnbindContext(__DRIcontext *pcp)
  558. {
  559.     __DRIdrawable *pdp;
  560.     __DRIdrawable *prp;
  561.  
  562.     /*
  563.     ** Assume error checking is done properly in glXMakeCurrent before
  564.     ** calling driUnbindContext.
  565.     */
  566.  
  567.     if (pcp == NULL)
  568.         return GL_FALSE;
  569.  
  570.     /*
  571.     ** Call driUnbindContext before checking for valid drawables
  572.     ** to handle surfaceless contexts properly.
  573.     */
  574.     pcp->driScreenPriv->driver->UnbindContext(pcp);
  575.  
  576.     pdp = pcp->driDrawablePriv;
  577.     prp = pcp->driReadablePriv;
  578.  
  579.     /* already unbound */
  580.     if (!pdp && !prp)
  581.         return GL_TRUE;
  582.  
  583.     assert(pdp);
  584.     if (pdp->refcount == 0) {
  585.         /* ERROR!!! */
  586.         return GL_FALSE;
  587.     }
  588.  
  589.     dri_put_drawable(pdp);
  590.  
  591.     if (prp != pdp) {
  592.         if (prp->refcount == 0) {
  593.             /* ERROR!!! */
  594.             return GL_FALSE;
  595.         }
  596.  
  597.         dri_put_drawable(prp);
  598.     }
  599.  
  600.     pcp->driDrawablePriv = NULL;
  601.     pcp->driReadablePriv = NULL;
  602.  
  603.     return GL_TRUE;
  604. }
  605.  
  606. /*@}*/
  607.  
  608.  
  609. static void dri_get_drawable(__DRIdrawable *pdp)
  610. {
  611.     pdp->refcount++;
  612. }
  613.  
  614. static void dri_put_drawable(__DRIdrawable *pdp)
  615. {
  616.     if (pdp) {
  617.         pdp->refcount--;
  618.         if (pdp->refcount)
  619.             return;
  620.  
  621.         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
  622.         free(pdp);
  623.     }
  624. }
  625.  
  626. static __DRIdrawable *
  627. driCreateNewDrawable(__DRIscreen *screen,
  628.                      const __DRIconfig *config,
  629.                      void *data)
  630. {
  631.     __DRIdrawable *pdraw;
  632.  
  633.     pdraw = malloc(sizeof *pdraw);
  634.     if (!pdraw)
  635.         return NULL;
  636.  
  637.     pdraw->loaderPrivate = data;
  638.  
  639.     pdraw->driScreenPriv = screen;
  640.     pdraw->driContextPriv = NULL;
  641.     pdraw->refcount = 0;
  642.     pdraw->lastStamp = 0;
  643.     pdraw->w = 0;
  644.     pdraw->h = 0;
  645.  
  646.     dri_get_drawable(pdraw);
  647.  
  648.     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
  649.                                       GL_FALSE)) {
  650.        free(pdraw);
  651.        return NULL;
  652.     }
  653.  
  654.     pdraw->dri2.stamp = pdraw->lastStamp + 1;
  655.  
  656.     return pdraw;
  657. }
  658.  
  659. static void
  660. driDestroyDrawable(__DRIdrawable *pdp)
  661. {
  662.     dri_put_drawable(pdp);
  663. }
  664.  
  665. static __DRIbuffer *
  666. dri2AllocateBuffer(__DRIscreen *screen,
  667.                    unsigned int attachment, unsigned int format,
  668.                    int width, int height)
  669. {
  670.     return screen->driver->AllocateBuffer(screen, attachment, format,
  671.                                           width, height);
  672. }
  673.  
  674. static void
  675. dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
  676. {
  677.     screen->driver->ReleaseBuffer(screen, buffer);
  678. }
  679.  
  680.  
  681. static int
  682. dri2ConfigQueryb(__DRIscreen *screen, const char *var, unsigned char *val)
  683. {
  684.    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
  685.       return -1;
  686.  
  687.    *val = driQueryOptionb(&screen->optionCache, var);
  688.  
  689.    return 0;
  690. }
  691.  
  692. static int
  693. dri2ConfigQueryi(__DRIscreen *screen, const char *var, int *val)
  694. {
  695.    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
  696.        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
  697.       return -1;
  698.  
  699.     *val = driQueryOptioni(&screen->optionCache, var);
  700.  
  701.     return 0;
  702. }
  703.  
  704. static int
  705. dri2ConfigQueryf(__DRIscreen *screen, const char *var, float *val)
  706. {
  707.    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
  708.       return -1;
  709.  
  710.     *val = driQueryOptionf(&screen->optionCache, var);
  711.  
  712.     return 0;
  713. }
  714.  
  715. static unsigned int
  716. driGetAPIMask(__DRIscreen *screen)
  717. {
  718.     return screen->api_mask;
  719. }
  720.  
  721. /**
  722.  * swrast swapbuffers entrypoint.
  723.  *
  724.  * DRI2 implements this inside the loader with only flushes handled by the
  725.  * driver.
  726.  */
  727. static void
  728. driSwapBuffers(__DRIdrawable *pdp)
  729. {
  730.     assert(pdp->driScreenPriv->swrast_loader);
  731.  
  732.     pdp->driScreenPriv->driver->SwapBuffers(pdp);
  733. }
  734.  
  735. /** Core interface */
  736. const __DRIcoreExtension driCoreExtension = {
  737.     .base = { __DRI_CORE, 1 },
  738.  
  739.     .createNewScreen            = NULL,
  740.     .destroyScreen              = driDestroyScreen,
  741.     .getExtensions              = driGetExtensions,
  742.     .getConfigAttrib            = driGetConfigAttrib,
  743.     .indexConfigAttrib          = driIndexConfigAttrib,
  744.     .createNewDrawable          = NULL,
  745.     .destroyDrawable            = driDestroyDrawable,
  746.     .swapBuffers                = driSwapBuffers, /* swrast */
  747.     .createNewContext           = driCreateNewContext, /* swrast */
  748.     .copyContext                = driCopyContext,
  749.     .destroyContext             = driDestroyContext,
  750.     .bindContext                = driBindContext,
  751.     .unbindContext              = driUnbindContext
  752. };
  753.  
  754. /** DRI2 interface */
  755. const __DRIdri2Extension driDRI2Extension = {
  756.     .base = { __DRI_DRI2, 4 },
  757.  
  758.     .createNewScreen            = dri2CreateNewScreen,
  759.     .createNewDrawable          = driCreateNewDrawable,
  760.     .createNewContext           = driCreateNewContext,
  761.     .getAPIMask                 = driGetAPIMask,
  762.     .createNewContextForAPI     = driCreateNewContextForAPI,
  763.     .allocateBuffer             = dri2AllocateBuffer,
  764.     .releaseBuffer              = dri2ReleaseBuffer,
  765.     .createContextAttribs       = driCreateContextAttribs,
  766.     .createNewScreen2           = driCreateNewScreen2,
  767. };
  768.  
  769. const __DRIswrastExtension driSWRastExtension = {
  770.     .base = { __DRI_SWRAST, 4 },
  771.  
  772.     .createNewScreen            = driSWRastCreateNewScreen,
  773.     .createNewDrawable          = driCreateNewDrawable,
  774.     .createNewContextForAPI     = driCreateNewContextForAPI,
  775.     .createContextAttribs       = driCreateContextAttribs,
  776.     .createNewScreen2           = driSWRastCreateNewScreen2,
  777. };
  778.  
  779. const __DRI2configQueryExtension dri2ConfigQueryExtension = {
  780.    .base = { __DRI2_CONFIG_QUERY, 1 },
  781.  
  782.    .configQueryb        = dri2ConfigQueryb,
  783.    .configQueryi        = dri2ConfigQueryi,
  784.    .configQueryf        = dri2ConfigQueryf,
  785. };
  786.  
  787. void
  788. dri2InvalidateDrawable(__DRIdrawable *drawable)
  789. {
  790.     drawable->dri2.stamp++;
  791. }
  792.  
  793. /**
  794.  * Check that the gl_framebuffer associated with dPriv is the right size.
  795.  * Resize the gl_framebuffer if needed.
  796.  * It's expected that the dPriv->driverPrivate member points to a
  797.  * gl_framebuffer object.
  798.  */
  799. void
  800. driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
  801. {
  802.    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
  803.    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
  804.       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
  805.       /* if the driver needs the hw lock for ResizeBuffers, the drawable
  806.          might have changed again by now */
  807.       assert(fb->Width == dPriv->w);
  808.       assert(fb->Height == dPriv->h);
  809.    }
  810. }
  811.  
  812. uint32_t
  813. driGLFormatToImageFormat(mesa_format format)
  814. {
  815.    switch (format) {
  816.    case MESA_FORMAT_B5G6R5_UNORM:
  817.       return __DRI_IMAGE_FORMAT_RGB565;
  818.    case MESA_FORMAT_B8G8R8X8_UNORM:
  819.       return __DRI_IMAGE_FORMAT_XRGB8888;
  820.    case MESA_FORMAT_B10G10R10A2_UNORM:
  821.       return __DRI_IMAGE_FORMAT_ARGB2101010;
  822.    case MESA_FORMAT_B10G10R10X2_UNORM:
  823.       return __DRI_IMAGE_FORMAT_XRGB2101010;
  824.    case MESA_FORMAT_B8G8R8A8_UNORM:
  825.       return __DRI_IMAGE_FORMAT_ARGB8888;
  826.    case MESA_FORMAT_R8G8B8A8_UNORM:
  827.       return __DRI_IMAGE_FORMAT_ABGR8888;
  828.    case MESA_FORMAT_R8G8B8X8_UNORM:
  829.       return __DRI_IMAGE_FORMAT_XBGR8888;
  830.    case MESA_FORMAT_R_UNORM8:
  831.       return __DRI_IMAGE_FORMAT_R8;
  832.    case MESA_FORMAT_R8G8_UNORM:
  833.       return __DRI_IMAGE_FORMAT_GR88;
  834.    case MESA_FORMAT_NONE:
  835.       return __DRI_IMAGE_FORMAT_NONE;
  836.    case MESA_FORMAT_B8G8R8A8_SRGB:
  837.       return __DRI_IMAGE_FORMAT_SARGB8;
  838.    default:
  839.       return 0;
  840.    }
  841. }
  842.  
  843. mesa_format
  844. driImageFormatToGLFormat(uint32_t image_format)
  845. {
  846.    switch (image_format) {
  847.    case __DRI_IMAGE_FORMAT_RGB565:
  848.       return MESA_FORMAT_B5G6R5_UNORM;
  849.    case __DRI_IMAGE_FORMAT_XRGB8888:
  850.       return MESA_FORMAT_B8G8R8X8_UNORM;
  851.    case __DRI_IMAGE_FORMAT_ARGB2101010:
  852.       return MESA_FORMAT_B10G10R10A2_UNORM;
  853.    case __DRI_IMAGE_FORMAT_XRGB2101010:
  854.       return MESA_FORMAT_B10G10R10X2_UNORM;
  855.    case __DRI_IMAGE_FORMAT_ARGB8888:
  856.       return MESA_FORMAT_B8G8R8A8_UNORM;
  857.    case __DRI_IMAGE_FORMAT_ABGR8888:
  858.       return MESA_FORMAT_R8G8B8A8_UNORM;
  859.    case __DRI_IMAGE_FORMAT_XBGR8888:
  860.       return MESA_FORMAT_R8G8B8X8_UNORM;
  861.    case __DRI_IMAGE_FORMAT_R8:
  862.       return MESA_FORMAT_R_UNORM8;
  863.    case __DRI_IMAGE_FORMAT_GR88:
  864.       return MESA_FORMAT_R8G8_UNORM;
  865.    case __DRI_IMAGE_FORMAT_SARGB8:
  866.       return MESA_FORMAT_B8G8R8A8_SRGB;
  867.    case __DRI_IMAGE_FORMAT_NONE:
  868.       return MESA_FORMAT_NONE;
  869.    default:
  870.       return MESA_FORMAT_NONE;
  871.    }
  872. }
  873.  
  874. /** Image driver interface */
  875. const __DRIimageDriverExtension driImageDriverExtension = {
  876.     .base = { __DRI_IMAGE_DRIVER, 1 },
  877.  
  878.     .createNewScreen2           = driCreateNewScreen2,
  879.     .createNewDrawable          = driCreateNewDrawable,
  880.     .getAPIMask                 = driGetAPIMask,
  881.     .createContextAttribs       = driCreateContextAttribs,
  882. };
  883.  
  884. /* swrast copy sub buffer entrypoint. */
  885. static void driCopySubBuffer(__DRIdrawable *pdp, int x, int y,
  886.                              int w, int h)
  887. {
  888.     assert(pdp->driScreenPriv->swrast_loader);
  889.  
  890.     pdp->driScreenPriv->driver->CopySubBuffer(pdp, x, y, w, h);
  891. }
  892.  
  893. /* for swrast only */
  894. const __DRIcopySubBufferExtension driCopySubBufferExtension = {
  895.    .base = { __DRI_COPY_SUB_BUFFER, 1 },
  896.  
  897.    .copySubBuffer               = driCopySubBuffer,
  898. };
  899.