SDL: src/video/x11/SDL_x11opengl.c@b43765095a6f

     1 /*

     2   Simple DirectMedia Layer

     3   Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>

     5   This software is provided 'as-is', without any express or implied

     6   warranty.  In no event will the authors be held liable for any damages

     7   arising from the use of this software.

     9   Permission is granted to anyone to use this software for any purpose,

    10   including commercial applications, and to alter it and redistribute it

    11   freely, subject to the following restrictions:

    13   1. The origin of this software must not be misrepresented; you must not

    14      claim that you wrote the original software. If you use this software

    15      in a product, an acknowledgment in the product documentation would be

    16      appreciated but is not required.

    17   2. Altered source versions must be plainly marked as such, and must not be

    18      misrepresented as being the original software.

    19   3. This notice may not be removed or altered from any source distribution.

    20 */

    21 #include "../../SDL_internal.h"

    23 #if SDL_VIDEO_DRIVER_X11

    25 #include "SDL_x11video.h"

    26 #include "SDL_assert.h"

    28 /* GLX implementation of SDL OpenGL support */

    30 #if SDL_VIDEO_OPENGL_GLX

    31 #include "SDL_loadso.h"

    32 #include "SDL_x11opengles.h"

    34 #if defined(__IRIX__)

    35 /* IRIX doesn't have a GL library versioning system */

    36 #define DEFAULT_OPENGL  "libGL.so"

    37 #elif defined(__MACOSX__)

    38 #define DEFAULT_OPENGL  "/usr/X11R6/lib/libGL.1.dylib"

    39 #elif defined(__QNXNTO__)

    40 #define DEFAULT_OPENGL  "libGL.so.3"

    41 #else

    42 #define DEFAULT_OPENGL  "libGL.so.1"

    43 #endif

    45 #ifndef GLX_NONE_EXT

    46 #define GLX_NONE_EXT                       0x8000

    47 #endif

    49 #ifndef GLX_ARB_multisample

    50 #define GLX_ARB_multisample

    51 #define GLX_SAMPLE_BUFFERS_ARB             100000

    52 #define GLX_SAMPLES_ARB                    100001

    53 #endif

    55 #ifndef GLX_EXT_visual_rating

    56 #define GLX_EXT_visual_rating

    57 #define GLX_VISUAL_CAVEAT_EXT              0x20

    58 #define GLX_NONE_EXT                       0x8000

    59 #define GLX_SLOW_VISUAL_EXT                0x8001

    60 #define GLX_NON_CONFORMANT_VISUAL_EXT      0x800D

    61 #endif

    63 #ifndef GLX_EXT_visual_info

    64 #define GLX_EXT_visual_info

    65 #define GLX_X_VISUAL_TYPE_EXT              0x22

    66 #define GLX_DIRECT_COLOR_EXT               0x8003

    67 #endif

    69 #ifndef GLX_ARB_create_context

    70 #define GLX_ARB_create_context

    71 #define GLX_CONTEXT_MAJOR_VERSION_ARB      0x2091

    72 #define GLX_CONTEXT_MINOR_VERSION_ARB      0x2092

    73 #define GLX_CONTEXT_FLAGS_ARB              0x2094

    74 #define GLX_CONTEXT_DEBUG_BIT_ARB          0x0001

    75 #define GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x0002

    77 /* Typedef for the GL 3.0 context creation function */

    78 typedef GLXContext(*PFNGLXCREATECONTEXTATTRIBSARBPROC) (Display * dpy,

    79                                                         GLXFBConfig config,

    80                                                         GLXContext

    81                                                         share_context,

    82                                                         Bool direct,

    83                                                         const int

    84                                                         *attrib_list);

    85 #endif

    87 #ifndef GLX_ARB_create_context_profile

    88 #define GLX_ARB_create_context_profile

    89 #define GLX_CONTEXT_PROFILE_MASK_ARB       0x9126

    90 #define GLX_CONTEXT_CORE_PROFILE_BIT_ARB   0x00000001

    91 #define GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002

    92 #endif

    94 #ifndef GLX_ARB_create_context_robustness

    95 #define GLX_ARB_create_context_robustness

    96 #define GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB  0x00000004

    97 #define GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB     0x8256

    98 #define GLX_NO_RESET_NOTIFICATION_ARB                   0x8261

    99 #define GLX_LOSE_CONTEXT_ON_RESET_ARB                   0x8252

   100 #endif

   102 #ifndef GLX_EXT_create_context_es2_profile

   103 #define GLX_EXT_create_context_es2_profile

   104 #ifndef GLX_CONTEXT_ES2_PROFILE_BIT_EXT

   105 #define GLX_CONTEXT_ES2_PROFILE_BIT_EXT    0x00000002

   106 #endif

   107 #endif

   109 #ifndef GLX_ARB_framebuffer_sRGB

   110 #define GLX_ARB_framebuffer_sRGB

   111 #ifndef GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB

   112 #define GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB                0x20B2

   113 #endif

   114 #endif

   116 #ifndef GLX_EXT_swap_control

   117 #define GLX_SWAP_INTERVAL_EXT              0x20F1

   118 #define GLX_MAX_SWAP_INTERVAL_EXT          0x20F2

   119 #endif

   121 #ifndef GLX_EXT_swap_control_tear

   122 #define GLX_LATE_SWAPS_TEAR_EXT 0x20F3

   123 #endif

   125 #define OPENGL_REQUIRES_DLOPEN

   126 #if defined(OPENGL_REQUIRES_DLOPEN) && defined(SDL_LOADSO_DLOPEN)

   127 #include <dlfcn.h>

   128 #define GL_LoadObject(X)    dlopen(X, (RTLD_NOW|RTLD_GLOBAL))

   129 #define GL_LoadFunction     dlsym

   130 #define GL_UnloadObject     dlclose

   131 #else

   132 #define GL_LoadObject   SDL_LoadObject

   133 #define GL_LoadFunction SDL_LoadFunction

   134 #define GL_UnloadObject SDL_UnloadObject

   135 #endif

   137 static void X11_GL_InitExtensions(_THIS);

   140 int

   141 X11_GL_LoadLibrary(_THIS, const char *path)

   142 {

   143     Display *display;

   144     void *handle;

   146     if (_this->gl_data) {

   147         return SDL_SetError("OpenGL context already created");

   148     }

   150     /* Load the OpenGL library */

   151     if (path == NULL) {

   152         path = SDL_getenv("SDL_OPENGL_LIBRARY");

   153     }

   154     if (path == NULL) {

   155         path = DEFAULT_OPENGL;

   156     }

   157     _this->gl_config.dll_handle = GL_LoadObject(path);

   158     if (!_this->gl_config.dll_handle) {

   159 #if defined(OPENGL_REQUIRES_DLOPEN) && defined(SDL_LOADSO_DLOPEN)

   160         SDL_SetError("Failed loading %s: %s", path, dlerror());

   161 #endif

   162         return -1;

   163     }

   164     SDL_strlcpy(_this->gl_config.driver_path, path,

   165                 SDL_arraysize(_this->gl_config.driver_path));

   167     /* Allocate OpenGL memory */

   168     _this->gl_data =

   169         (struct SDL_GLDriverData *) SDL_calloc(1,

   170                                                sizeof(struct

   171                                                       SDL_GLDriverData));

   172     if (!_this->gl_data) {

   173         return SDL_OutOfMemory();

   174     }

   176     /* Load function pointers */

   177     handle = _this->gl_config.dll_handle;

   178     _this->gl_data->glXQueryExtension =

   179         (Bool (*)(Display *, int *, int *))

   180             GL_LoadFunction(handle, "glXQueryExtension");

   181     _this->gl_data->glXGetProcAddress =

   182         (void *(*)(const GLubyte *))

   183             GL_LoadFunction(handle, "glXGetProcAddressARB");

   184     _this->gl_data->glXChooseVisual =

   185         (XVisualInfo * (*)(Display *, int, int *))

   186             X11_GL_GetProcAddress(_this, "glXChooseVisual");

   187     _this->gl_data->glXCreateContext =

   188         (GLXContext(*)(Display *, XVisualInfo *, GLXContext, int))

   189             X11_GL_GetProcAddress(_this, "glXCreateContext");

   190     _this->gl_data->glXDestroyContext =

   191         (void (*)(Display *, GLXContext))

   192             X11_GL_GetProcAddress(_this, "glXDestroyContext");

   193     _this->gl_data->glXMakeCurrent =

   194         (int (*)(Display *, GLXDrawable, GLXContext))

   195             X11_GL_GetProcAddress(_this, "glXMakeCurrent");

   196     _this->gl_data->glXSwapBuffers =

   197         (void (*)(Display *, GLXDrawable))

   198             X11_GL_GetProcAddress(_this, "glXSwapBuffers");

   199     _this->gl_data->glXQueryDrawable =

   200         (void (*)(Display*,GLXDrawable,int,unsigned int*))

   201             X11_GL_GetProcAddress(_this, "glXQueryDrawable");

   203     if (!_this->gl_data->glXQueryExtension ||

   204         !_this->gl_data->glXChooseVisual ||

   205         !_this->gl_data->glXCreateContext ||

   206         !_this->gl_data->glXDestroyContext ||

   207         !_this->gl_data->glXMakeCurrent ||

   208         !_this->gl_data->glXSwapBuffers) {

   209         return SDL_SetError("Could not retrieve OpenGL functions");

   210     }

   212     display = ((SDL_VideoData *) _this->driverdata)->display;

   213     if (!_this->gl_data->glXQueryExtension(display, &_this->gl_data->errorBase, &_this->gl_data->eventBase)) {

   214         return SDL_SetError("GLX is not supported");

   215     }

   217     /* Initialize extensions */

   218     X11_GL_InitExtensions(_this);

   220     /* If we need a GL ES context and there's no

   221      * GLX_EXT_create_context_es2_profile extension, switch over to X11_GLES functions

   222      */

   223     if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES &&

   224         ! _this->gl_data->HAS_GLX_EXT_create_context_es2_profile ) {

   225 #if SDL_VIDEO_OPENGL_EGL

   226         X11_GL_UnloadLibrary(_this);

   227         /* Better avoid conflicts! */

   228         if (_this->gl_config.dll_handle != NULL ) {

   229             GL_UnloadObject(_this->gl_config.dll_handle);

   230             _this->gl_config.dll_handle = NULL;

   231         }

   232         _this->GL_LoadLibrary = X11_GLES_LoadLibrary;

   233         _this->GL_GetProcAddress = X11_GLES_GetProcAddress;

   234         _this->GL_UnloadLibrary = X11_GLES_UnloadLibrary;

   235         _this->GL_CreateContext = X11_GLES_CreateContext;

   236         _this->GL_MakeCurrent = X11_GLES_MakeCurrent;

   237         _this->GL_SetSwapInterval = X11_GLES_SetSwapInterval;

   238         _this->GL_GetSwapInterval = X11_GLES_GetSwapInterval;

   239         _this->GL_SwapWindow = X11_GLES_SwapWindow;

   240         _this->GL_DeleteContext = X11_GLES_DeleteContext;

   241         return X11_GLES_LoadLibrary(_this, NULL);

   242 #else

   243         return SDL_SetError("SDL not configured with EGL support");

   244 #endif

   245     }

   247     return 0;

   248 }

   250 void *

   251 X11_GL_GetProcAddress(_THIS, const char *proc)

   252 {

   253     if (_this->gl_data->glXGetProcAddress) {

   254         return _this->gl_data->glXGetProcAddress((const GLubyte *) proc);

   255     }

   256     return GL_LoadFunction(_this->gl_config.dll_handle, proc);

   257 }

   259 void

   260 X11_GL_UnloadLibrary(_THIS)

   261 {

   262     /* Don't actually unload the library, since it may have registered

   263      * X11 shutdown hooks, per the notes at:

   264      * http://dri.sourceforge.net/doc/DRIuserguide.html

   265      */

   266 #if 0

   267     GL_UnloadObject(_this->gl_config.dll_handle);

   268     _this->gl_config.dll_handle = NULL;

   269 #endif

   271     /* Free OpenGL memory */

   272     SDL_free(_this->gl_data);

   273     _this->gl_data = NULL;

   274 }

   276 static SDL_bool

   277 HasExtension(const char *extension, const char *extensions)

   278 {

   279     const char *start;

   280     const char *where, *terminator;

   282     /* Extension names should not have spaces. */

   283     where = SDL_strchr(extension, ' ');

   284     if (where || *extension == '\0')

   285         return SDL_FALSE;

   287     if (!extensions)

   288         return SDL_FALSE;

   290     /* It takes a bit of care to be fool-proof about parsing the

   291      * OpenGL extensions string. Don't be fooled by sub-strings,

   292      * etc. */

   294     start = extensions;

   296     for (;;) {

   297         where = SDL_strstr(start, extension);

   298         if (!where)

   299             break;

   301         terminator = where + SDL_strlen(extension);

   302         if (where == start || *(where - 1) == ' ')

   303             if (*terminator == ' ' || *terminator == '\0')

   304                 return SDL_TRUE;

   306         start = terminator;

   307     }

   308     return SDL_FALSE;

   309 }

   311 static void

   312 X11_GL_InitExtensions(_THIS)

   313 {

   314     Display *display = ((SDL_VideoData *) _this->driverdata)->display;

   315     int screen = DefaultScreen(display);

   316     XVisualInfo *vinfo;

   317     XSetWindowAttributes xattr;

   318     Window w;

   319     GLXContext context;

   320     const char *(*glXQueryExtensionsStringFunc) (Display *, int);

   321     const char *extensions;

   323     vinfo = X11_GL_GetVisual(_this, display, screen);

   324     if (!vinfo) {

   325         return;

   326     }

   327     xattr.background_pixel = 0;

   328     xattr.border_pixel = 0;

   329     xattr.colormap =

   330         X11_XCreateColormap(display, RootWindow(display, screen), vinfo->visual,

   331                         AllocNone);

   332     w = X11_XCreateWindow(display, RootWindow(display, screen), 0, 0, 32, 32, 0,

   333                       vinfo->depth, InputOutput, vinfo->visual,

   334                       (CWBackPixel | CWBorderPixel | CWColormap), &xattr);

   335     context = _this->gl_data->glXCreateContext(display, vinfo, NULL, True);

   336     if (context) {

   337         _this->gl_data->glXMakeCurrent(display, w, context);

   338     }

   339     X11_XFree(vinfo);

   341     glXQueryExtensionsStringFunc =

   342         (const char *(*)(Display *, int)) X11_GL_GetProcAddress(_this,

   343                                                                 "glXQueryExtensionsString");

   344     if (glXQueryExtensionsStringFunc) {

   345         extensions = glXQueryExtensionsStringFunc(display, screen);

   346     } else {

   347         extensions = NULL;

   348     }

   350     /* Check for GLX_EXT_swap_control(_tear) */

   351     _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_FALSE;

   352     if (HasExtension("GLX_EXT_swap_control", extensions)) {

   353         _this->gl_data->glXSwapIntervalEXT =

   354             (void (*)(Display*,GLXDrawable,int))

   355                 X11_GL_GetProcAddress(_this, "glXSwapIntervalEXT");

   356         if (HasExtension("GLX_EXT_swap_control_tear", extensions)) {

   357             _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_TRUE;

   358         }

   359     }

   361     /* Check for GLX_MESA_swap_control */

   362     if (HasExtension("GLX_MESA_swap_control", extensions)) {

   363         _this->gl_data->glXSwapIntervalMESA =

   364             (int(*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalMESA");

   365         _this->gl_data->glXGetSwapIntervalMESA =

   366             (int(*)(void)) X11_GL_GetProcAddress(_this,

   367                                                    "glXGetSwapIntervalMESA");

   368     }

   370     /* Check for GLX_SGI_swap_control */

   371     if (HasExtension("GLX_SGI_swap_control", extensions)) {

   372         _this->gl_data->glXSwapIntervalSGI =

   373             (int (*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");

   374     }

   376     /* Check for GLX_EXT_visual_rating */

   377     if (HasExtension("GLX_EXT_visual_rating", extensions)) {

   378         _this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;

   379     }

   381     /* Check for GLX_EXT_visual_info */

   382     if (HasExtension("GLX_EXT_visual_info", extensions)) {

   383         _this->gl_data->HAS_GLX_EXT_visual_info = SDL_TRUE;

   384     }

   386     /* Check for GLX_EXT_create_context_es2_profile */

   387     if (HasExtension("GLX_EXT_create_context_es2_profile", extensions)) {

   388         _this->gl_data->HAS_GLX_EXT_create_context_es2_profile = SDL_TRUE;

   389     }

   391     if (context) {

   392         _this->gl_data->glXMakeCurrent(display, None, NULL);

   393         _this->gl_data->glXDestroyContext(display, context);

   394     }

   395     X11_XDestroyWindow(display, w);

   396     X11_PumpEvents(_this);

   397 }

   399 /* glXChooseVisual and glXChooseFBConfig have some small differences in

   400  * the attribute encoding, it can be chosen with the for_FBConfig parameter.

   401  */

   402 int

   403 X11_GL_GetAttributes(_THIS, Display * display, int screen, int * attribs, int size, Bool for_FBConfig)

   404 {

   405     int i = 0;

   406     const int MAX_ATTRIBUTES = 64;

   408     /* assert buffer is large enough to hold all SDL attributes. */

   409     SDL_assert(size >= MAX_ATTRIBUTES);

   411     /* Setup our GLX attributes according to the gl_config. */

   412     if( for_FBConfig ) {

   413         attribs[i++] = GLX_RENDER_TYPE;

   414         attribs[i++] = GLX_RGBA_BIT;

   415     } else {

   416         attribs[i++] = GLX_RGBA;

   417     }

   418     attribs[i++] = GLX_RED_SIZE;

   419     attribs[i++] = _this->gl_config.red_size;

   420     attribs[i++] = GLX_GREEN_SIZE;

   421     attribs[i++] = _this->gl_config.green_size;

   422     attribs[i++] = GLX_BLUE_SIZE;

   423     attribs[i++] = _this->gl_config.blue_size;

   425     if (_this->gl_config.alpha_size) {

   426         attribs[i++] = GLX_ALPHA_SIZE;

   427         attribs[i++] = _this->gl_config.alpha_size;

   428     }

   430     if (_this->gl_config.double_buffer) {

   431         attribs[i++] = GLX_DOUBLEBUFFER;

   432         if( for_FBConfig ) {

   433             attribs[i++] = True;

   434         }

   435     }

   437     attribs[i++] = GLX_DEPTH_SIZE;

   438     attribs[i++] = _this->gl_config.depth_size;

   440     if (_this->gl_config.stencil_size) {

   441         attribs[i++] = GLX_STENCIL_SIZE;

   442         attribs[i++] = _this->gl_config.stencil_size;

   443     }

   445     if (_this->gl_config.accum_red_size) {

   446         attribs[i++] = GLX_ACCUM_RED_SIZE;

   447         attribs[i++] = _this->gl_config.accum_red_size;

   448     }

   450     if (_this->gl_config.accum_green_size) {

   451         attribs[i++] = GLX_ACCUM_GREEN_SIZE;

   452         attribs[i++] = _this->gl_config.accum_green_size;

   453     }

   455     if (_this->gl_config.accum_blue_size) {

   456         attribs[i++] = GLX_ACCUM_BLUE_SIZE;

   457         attribs[i++] = _this->gl_config.accum_blue_size;

   458     }

   460     if (_this->gl_config.accum_alpha_size) {

   461         attribs[i++] = GLX_ACCUM_ALPHA_SIZE;

   462         attribs[i++] = _this->gl_config.accum_alpha_size;

   463     }

   465     if (_this->gl_config.stereo) {

   466         attribs[i++] = GLX_STEREO;

   467         if( for_FBConfig ) {

   468             attribs[i++] = True;

   469         }

   470     }

   472     if (_this->gl_config.multisamplebuffers) {

   473         attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;

   474         attribs[i++] = _this->gl_config.multisamplebuffers;

   475     }

   477     if (_this->gl_config.multisamplesamples) {

   478         attribs[i++] = GLX_SAMPLES_ARB;

   479         attribs[i++] = _this->gl_config.multisamplesamples;

   480     }

   482     if (_this->gl_config.framebuffer_srgb_capable) {

   483         attribs[i++] = GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB;

   484         if( for_FBConfig ) {

   485             attribs[i++] = True;

   486         }

   487     }

   489     if (_this->gl_config.accelerated >= 0 &&

   490         _this->gl_data->HAS_GLX_EXT_visual_rating) {

   491         attribs[i++] = GLX_VISUAL_CAVEAT_EXT;

   492         attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :

   493                                                       GLX_SLOW_VISUAL_EXT;

   494     }

   496     /* If we're supposed to use DirectColor visuals, and we've got the

   497        EXT_visual_info extension, then add GLX_X_VISUAL_TYPE_EXT. */

   498     if (X11_UseDirectColorVisuals() &&

   499         _this->gl_data->HAS_GLX_EXT_visual_info) {

   500         attribs[i++] = GLX_X_VISUAL_TYPE_EXT;

   501         attribs[i++] = GLX_DIRECT_COLOR_EXT;

   502     }

   504     attribs[i++] = None;

   506     SDL_assert(i <= MAX_ATTRIBUTES);

   508     return i;

   509 }

   511 XVisualInfo *

   512 X11_GL_GetVisual(_THIS, Display * display, int screen)

   513 {

   514     XVisualInfo *vinfo;

   516     /* 64 seems nice. */

   517     int attribs[64];

   518     X11_GL_GetAttributes(_this,display,screen,attribs,64,SDL_FALSE);

   520     if (!_this->gl_data) {

   521         /* The OpenGL library wasn't loaded, SDL_GetError() should have info */

   522         return NULL;

   523     }

   525     vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);

   526     if (!vinfo) {

   527         SDL_SetError("Couldn't find matching GLX visual");

   528     }

   529     return vinfo;

   530 }

   532 #ifndef GLXBadContext

   533 #define GLXBadContext 0

   534 #endif

   535 #ifndef GLXBadFBConfig

   536 #define GLXBadFBConfig 9

   537 #endif

   538 #ifndef GLXBadProfileARB

   539 #define GLXBadProfileARB 13

   540 #endif

   541 static int (*handler) (Display *, XErrorEvent *) = NULL;

   542 static int errorBase = 0;

   543 static int

   544 X11_GL_CreateContextErrorHandler(Display * d, XErrorEvent * e)

   545 {

   546     switch (e->error_code) {

   547     case BadRequest:

   548     case BadMatch:

   549     case BadValue:

   550     case BadAlloc:

   551         return (0);

   552     default:

   553         if (errorBase &&

   554             (e->error_code == errorBase + GLXBadContext ||

   555              e->error_code == errorBase + GLXBadFBConfig ||

   556              e->error_code == errorBase + GLXBadProfileARB)) {

   557             return (0);

   558         }

   559         return (handler(d, e));

   560     }

   561 }

   563 SDL_GLContext

   564 X11_GL_CreateContext(_THIS, SDL_Window * window)

   565 {

   566     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;

   567     Display *display = data->videodata->display;

   568     int screen =

   569         ((SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata)->screen;

   570     XWindowAttributes xattr;

   571     XVisualInfo v, *vinfo;

   572     int n;

   573     GLXContext context = NULL, share_context;

   574     PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs = NULL;

   576     if (_this->gl_config.share_with_current_context) {

   577         share_context = (GLXContext)SDL_GL_GetCurrentContext();

   578     } else {

   579         share_context = NULL;

   580     }

   582     /* We do this to create a clean separation between X and GLX errors. */

   583     X11_XSync(display, False);

   584     errorBase = _this->gl_data->errorBase;

   585     handler = X11_XSetErrorHandler(X11_GL_CreateContextErrorHandler);

   586     X11_XGetWindowAttributes(display, data->xwindow, &xattr);

   587     v.screen = screen;

   588     v.visualid = X11_XVisualIDFromVisual(xattr.visual);

   589     vinfo = X11_XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);

   590     if (vinfo) {

   591         if (_this->gl_config.major_version < 3 &&

   592             _this->gl_config.profile_mask == 0 &&

   593             _this->gl_config.flags == 0) {

   594             /* Create legacy context */

   595             context =

   596                 _this->gl_data->glXCreateContext(display, vinfo, share_context, True);

   597         } else {

   598             /* If we want a GL 3.0 context or later we need to get a temporary

   599                context to grab the new context creation function */

   600             GLXContext temp_context =

   601                 _this->gl_data->glXCreateContext(display, vinfo, NULL, True);

   602             if (temp_context) {

   603                 /* max 8 attributes plus terminator */

   604                 int attribs[9] = {

   605                     GLX_CONTEXT_MAJOR_VERSION_ARB,

   606                     _this->gl_config.major_version,

   607                     GLX_CONTEXT_MINOR_VERSION_ARB,

   608                     _this->gl_config.minor_version,

   609                     0

   610                 };

   611                 int iattr = 4;

   613                 /* SDL profile bits match GLX profile bits */

   614                 if( _this->gl_config.profile_mask != 0 ) {

   615                     attribs[iattr++] = GLX_CONTEXT_PROFILE_MASK_ARB;

   616                     attribs[iattr++] = _this->gl_config.profile_mask;

   617                 }

   619                 /* SDL flags match GLX flags */

   620                 if( _this->gl_config.flags != 0 ) {

   621                     attribs[iattr++] = GLX_CONTEXT_FLAGS_ARB;

   622                     attribs[iattr++] = _this->gl_config.flags;

   623                 }

   625                 attribs[iattr++] = 0;

   627                 /* Get a pointer to the context creation function for GL 3.0 */

   628                 glXCreateContextAttribs =

   629                     (PFNGLXCREATECONTEXTATTRIBSARBPROC) _this->gl_data->

   630                     glXGetProcAddress((GLubyte *)

   631                                       "glXCreateContextAttribsARB");

   632                 if (!glXCreateContextAttribs) {

   633                     SDL_SetError("GL 3.x is not supported");

   634                     context = temp_context;

   635                 } else {

   636                     int glxAttribs[64];

   638                     /* Create a GL 3.x context */

   639                     GLXFBConfig *framebuffer_config = NULL;

   640                     int fbcount = 0;

   641                     GLXFBConfig *(*glXChooseFBConfig) (Display * disp,

   642                                                        int screen,

   643                                                        const int *attrib_list,

   644                                                        int *nelements);

   646                     glXChooseFBConfig =

   647                         (GLXFBConfig *

   648                          (*)(Display *, int, const int *,

   649                              int *)) _this->gl_data->

   650                         glXGetProcAddress((GLubyte *) "glXChooseFBConfig");

   652                     X11_GL_GetAttributes(_this,display,screen,glxAttribs,64,SDL_TRUE);

   654                     if (!glXChooseFBConfig

   655                         || !(framebuffer_config =

   656                              glXChooseFBConfig(display,

   657                                                DefaultScreen(display), glxAttribs,

   658                                                &fbcount))) {

   659                         SDL_SetError

   660                             ("No good framebuffers found. GL 3.x disabled");

   661                         context = temp_context;

   662                     } else {

   663                         context =

   664                             glXCreateContextAttribs(display,

   665                                                     framebuffer_config[0],

   666                                                     share_context, True, attribs);

   667                         _this->gl_data->glXDestroyContext(display,

   668                                                           temp_context);

   669                     }

   670                 }

   671             }

   672         }

   673         X11_XFree(vinfo);

   674     }

   675     X11_XSync(display, False);

   676     X11_XSetErrorHandler(handler);

   678     if (!context) {

   679         SDL_SetError("Could not create GL context");

   680         return NULL;

   681     }

   683     if (X11_GL_MakeCurrent(_this, window, context) < 0) {

   684         X11_GL_DeleteContext(_this, context);

   685         return NULL;

   686     }

   688     return context;

   689 }

   691 int

   692 X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)

   693 {

   694     Display *display = ((SDL_VideoData *) _this->driverdata)->display;

   695     Window drawable =

   696         (context ? ((SDL_WindowData *) window->driverdata)->xwindow : None);

   697     GLXContext glx_context = (GLXContext) context;

   699     if (!_this->gl_data) {

   700         return SDL_SetError("OpenGL not initialized");

   701     }

   703     if (!_this->gl_data->glXMakeCurrent(display, drawable, glx_context)) {

   704         return SDL_SetError("Unable to make GL context current");

   705     }

   707     return 0;

   708 }

   710 /*

   711    0 is a valid argument to glxSwapInterval(MESA|EXT) and setting it to 0

   712    will undo the effect of a previous call with a value that is greater

   713    than zero (or at least that is what the docs say). OTOH, 0 is an invalid

   714    argument to glxSwapIntervalSGI and it returns an error if you call it

   715    with 0 as an argument.

   716 */

   718 static int swapinterval = -1;

   719 int

   720 X11_GL_SetSwapInterval(_THIS, int interval)

   721 {

   722     int status = -1;

   724     if ((interval < 0) && (!_this->gl_data->HAS_GLX_EXT_swap_control_tear)) {

   725         SDL_SetError("Negative swap interval unsupported in this GL");

   726     } else if (_this->gl_data->glXSwapIntervalEXT) {

   727         Display *display = ((SDL_VideoData *) _this->driverdata)->display;

   728         const SDL_WindowData *windowdata = (SDL_WindowData *)

   729             SDL_GL_GetCurrentWindow()->driverdata;

   731         Window drawable = windowdata->xwindow;

   733         /*

   734          * This is a workaround for a bug in NVIDIA drivers. Bug has been reported

   735          * and will be fixed in a future release (probably 319.xx).

   736          *

   737          * There's a bug where glXSetSwapIntervalEXT ignores updates because

   738          * it has the wrong value cached. To work around it, we just run a no-op

   739          * update to the current value.

   740          */

   741         int currentInterval = X11_GL_GetSwapInterval(_this);

   742         _this->gl_data->glXSwapIntervalEXT(display, drawable, currentInterval);

   743         _this->gl_data->glXSwapIntervalEXT(display, drawable, interval);

   745         status = 0;

   746         swapinterval = interval;

   747     } else if (_this->gl_data->glXSwapIntervalMESA) {

   748         status = _this->gl_data->glXSwapIntervalMESA(interval);

   749         if (status != 0) {

   750             SDL_SetError("glxSwapIntervalMESA failed");

   751         } else {

   752             swapinterval = interval;

   753         }

   754     } else if (_this->gl_data->glXSwapIntervalSGI) {

   755         status = _this->gl_data->glXSwapIntervalSGI(interval);

   756         if (status != 0) {

   757             SDL_SetError("glxSwapIntervalSGI failed");

   758         } else {

   759             swapinterval = interval;

   760         }

   761     } else {

   762         SDL_Unsupported();

   763     }

   764     return status;

   765 }

   767 int

   768 X11_GL_GetSwapInterval(_THIS)

   769 {

   770     if (_this->gl_data->glXSwapIntervalEXT) {

   771         Display *display = ((SDL_VideoData *) _this->driverdata)->display;

   772         const SDL_WindowData *windowdata = (SDL_WindowData *)

   773             SDL_GL_GetCurrentWindow()->driverdata;

   774         Window drawable = windowdata->xwindow;

   775         unsigned int allow_late_swap_tearing = 0;

   776         unsigned int interval = 0;

   778         if (_this->gl_data->HAS_GLX_EXT_swap_control_tear) {

   779             _this->gl_data->glXQueryDrawable(display, drawable,

   780                                             GLX_LATE_SWAPS_TEAR_EXT,

   781                                             &allow_late_swap_tearing);

   782         }

   784         _this->gl_data->glXQueryDrawable(display, drawable,

   785                                          GLX_SWAP_INTERVAL_EXT, &interval);

   787         if ((allow_late_swap_tearing) && (interval > 0)) {

   788             return -((int) interval);

   789         }

   791         return (int) interval;

   792     } else if (_this->gl_data->glXGetSwapIntervalMESA) {

   793         return _this->gl_data->glXGetSwapIntervalMESA();

   794     } else {

   795         return swapinterval;

   796     }

   797 }

   799 void

   800 X11_GL_SwapWindow(_THIS, SDL_Window * window)

   801 {

   802     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;

   803     Display *display = data->videodata->display;

   805     _this->gl_data->glXSwapBuffers(display, data->xwindow);

   806 }

   808 void

   809 X11_GL_DeleteContext(_THIS, SDL_GLContext context)

   810 {

   811     Display *display = ((SDL_VideoData *) _this->driverdata)->display;

   812     GLXContext glx_context = (GLXContext) context;

   814     if (!_this->gl_data) {

   815         return;

   816     }

   817     _this->gl_data->glXDestroyContext(display, glx_context);

   818     X11_XSync(display, False);

   819 }

   821 #endif /* SDL_VIDEO_OPENGL_GLX */

   823 #endif /* SDL_VIDEO_DRIVER_X11 */

   825 /* vi: set ts=4 sw=4 expandtab: */

author	Ryan C. Gordon
	Sun, 24 Nov 2013 23:56:17 -0500
changeset 8093	b43765095a6f
parent 7853	4861edda71d1
child 8149	681eb46b8ac4
permissions	-rw-r--r--