src/video/x11/SDL_x11opengl.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 03 Apr 2009 17:19:05 +0000
changeset 3105 cdeee9f9b14b
parent 3100 7dc982143c06
child 3139 7f684f249ec9
permissions -rw-r--r--
Fixed bug #721

From michalziulek@gmail.com 2009-03-28 07:43:34 (-) [reply]

There is a bug in OpenGL 3.x context creation code.
Function glXGetProcAddress is used directly where it should be:
_this->gl_data->glXGetProcAddress. I have attached patch which fixes this on
x11 and win32. Thanks.
slouken@1952
     1
/*
slouken@1952
     2
    SDL - Simple DirectMedia Layer
slouken@2859
     3
    Copyright (C) 1997-2009 Sam Lantinga
slouken@1952
     4
slouken@1952
     5
    This library is free software; you can redistribute it and/or
slouken@1952
     6
    modify it under the terms of the GNU Lesser General Public
slouken@1952
     7
    License as published by the Free Software Foundation; either
slouken@1952
     8
    version 2.1 of the License, or (at your option) any later version.
slouken@1952
     9
slouken@1952
    10
    This library is distributed in the hope that it will be useful,
slouken@1952
    11
    but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@1952
    12
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@1952
    13
    Lesser General Public License for more details.
slouken@1952
    14
slouken@1952
    15
    You should have received a copy of the GNU Lesser General Public
slouken@1952
    16
    License along with _this library; if not, write to the Free Software
slouken@1952
    17
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
slouken@1952
    18
slouken@1952
    19
    Sam Lantinga
slouken@1952
    20
    slouken@libsdl.org
slouken@1952
    21
*/
slouken@1952
    22
#include "SDL_config.h"
slouken@1952
    23
slouken@1952
    24
#include "SDL_x11video.h"
slouken@1952
    25
slouken@1952
    26
/* GLX implementation of SDL OpenGL support */
slouken@1952
    27
slouken@1952
    28
#if SDL_VIDEO_OPENGL_GLX
slouken@1952
    29
#include "SDL_loadso.h"
slouken@1952
    30
slouken@1952
    31
#if defined(__IRIX__)
slouken@1952
    32
/* IRIX doesn't have a GL library versioning system */
slouken@1952
    33
#define DEFAULT_OPENGL	"libGL.so"
slouken@1952
    34
#elif defined(__MACOSX__)
slouken@1952
    35
#define DEFAULT_OPENGL	"/usr/X11R6/lib/libGL.1.dylib"
slouken@1952
    36
#elif defined(__QNXNTO__)
slouken@1952
    37
#define DEFAULT_OPENGL	"libGL.so.3"
slouken@1952
    38
#else
slouken@1952
    39
#define DEFAULT_OPENGL	"libGL.so.1"
slouken@1952
    40
#endif
slouken@1952
    41
slouken@1952
    42
#ifndef GLX_ARB_multisample
slouken@1952
    43
#define GLX_ARB_multisample
slouken@1952
    44
#define GLX_SAMPLE_BUFFERS_ARB             100000
slouken@1952
    45
#define GLX_SAMPLES_ARB                    100001
slouken@1952
    46
#endif
slouken@1952
    47
slouken@1952
    48
#ifndef GLX_EXT_visual_rating
slouken@1952
    49
#define GLX_EXT_visual_rating
slouken@1952
    50
#define GLX_VISUAL_CAVEAT_EXT              0x20
slouken@1952
    51
#define GLX_NONE_EXT                       0x8000
slouken@1952
    52
#define GLX_SLOW_VISUAL_EXT                0x8001
slouken@1952
    53
#define GLX_NON_CONFORMANT_VISUAL_EXT      0x800D
slouken@1952
    54
#endif
slouken@1952
    55
slouken@3100
    56
#ifndef GLX_ARB_create_context
slouken@3100
    57
#define GLX_ARB_create_context
slouken@3100
    58
#define GLX_CONTEXT_MAJOR_VERSION_ARB      0x2091
slouken@3100
    59
#define GLX_CONTEXT_MINOR_VERSION_ARB      0x2092
slouken@3100
    60
#define GLX_CONTEXT_FLAGS_ARB              0x2094
slouken@3100
    61
#define GLX_CONTEXT_DEBUG_BIT_ARB          0x0001
slouken@3100
    62
#define GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x0002
slouken@3100
    63
#endif
slouken@3100
    64
slouken@1952
    65
#define OPENGL_REQUIRS_DLOPEN
slouken@1952
    66
#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
slouken@1952
    67
#include <dlfcn.h>
slouken@1952
    68
#define GL_LoadObject(X)	dlopen(X, (RTLD_NOW|RTLD_GLOBAL))
slouken@1952
    69
#define GL_LoadFunction		dlsym
slouken@1952
    70
#define GL_UnloadObject		dlclose
slouken@1952
    71
#else
slouken@1952
    72
#define GL_LoadObject	SDL_LoadObject
slouken@1952
    73
#define GL_LoadFunction	SDL_LoadFunction
slouken@1952
    74
#define GL_UnloadObject	SDL_UnloadObject
slouken@1952
    75
#endif
slouken@1952
    76
slouken@3057
    77
static void X11_GL_InitExtensions(_THIS);
bob@2322
    78
slouken@3100
    79
/* Typedef for the GL 3.0 context creation function */
slouken@3100
    80
typedef GLXContext ( * PFNGLXCREATECONTEXTATTRIBSARBPROC) (Display *dpy, GLXFBConfig config, GLXContext share_context, Bool direct, const int *attrib_list);
slouken@3100
    81
slouken@1952
    82
int
slouken@1952
    83
X11_GL_LoadLibrary(_THIS, const char *path)
slouken@1952
    84
{
slouken@1952
    85
    void *handle;
slouken@1952
    86
slouken@3057
    87
    /* Load the OpenGL library */
slouken@3057
    88
    if (path == NULL) {
slouken@3057
    89
        path = SDL_getenv("SDL_OPENGL_LIBRARY");
slouken@1952
    90
    }
slouken@3057
    91
    if (path == NULL) {
slouken@3057
    92
        path = DEFAULT_OPENGL;
slouken@3057
    93
    }
slouken@3057
    94
    _this->gl_config.dll_handle = SDL_LoadObject(path);
slouken@3057
    95
    if (!_this->gl_config.dll_handle) {
slouken@3057
    96
        return -1;
slouken@3057
    97
    }
slouken@3057
    98
    SDL_strlcpy(_this->gl_config.driver_path, path,
slouken@3057
    99
                SDL_arraysize(_this->gl_config.driver_path));
slouken@2244
   100
slouken@3057
   101
    /* Allocate OpenGL memory */
slouken@3057
   102
    _this->gl_data =
slouken@3057
   103
        (struct SDL_GLDriverData *) SDL_calloc(1,
slouken@3057
   104
                                               sizeof(struct
slouken@3057
   105
                                                      SDL_GLDriverData));
slouken@3057
   106
    if (!_this->gl_data) {
slouken@3057
   107
        SDL_OutOfMemory();
slouken@3057
   108
        return -1;
slouken@3057
   109
    }
slouken@3057
   110
slouken@3057
   111
    /* Load function pointers */
slouken@3057
   112
    handle = _this->gl_config.dll_handle;
slouken@1952
   113
    _this->gl_data->glXGetProcAddress =
slouken@1952
   114
        (void *(*)(const GLubyte *)) GL_LoadFunction(handle,
slouken@1952
   115
                                                     "glXGetProcAddressARB");
slouken@1952
   116
    _this->gl_data->glXChooseVisual =
slouken@1952
   117
        (XVisualInfo * (*)(Display *, int, int *)) GL_LoadFunction(handle,
slouken@1952
   118
                                                                   "glXChooseVisual");
slouken@1952
   119
    _this->gl_data->glXCreateContext =
slouken@1952
   120
        (GLXContext(*)(Display *, XVisualInfo *, GLXContext, int))
slouken@1952
   121
        GL_LoadFunction(handle, "glXCreateContext");
slouken@1952
   122
    _this->gl_data->glXDestroyContext =
slouken@1952
   123
        (void (*)(Display *, GLXContext)) GL_LoadFunction(handle,
slouken@1952
   124
                                                          "glXDestroyContext");
slouken@1952
   125
    _this->gl_data->glXMakeCurrent =
slouken@1952
   126
        (int (*)(Display *, GLXDrawable, GLXContext)) GL_LoadFunction(handle,
slouken@1952
   127
                                                                      "glXMakeCurrent");
slouken@1952
   128
    _this->gl_data->glXSwapBuffers =
slouken@1952
   129
        (void (*)(Display *, GLXDrawable)) GL_LoadFunction(handle,
slouken@1952
   130
                                                           "glXSwapBuffers");
slouken@1952
   131
slouken@1952
   132
    if (!_this->gl_data->glXChooseVisual ||
slouken@1952
   133
        !_this->gl_data->glXCreateContext ||
slouken@1952
   134
        !_this->gl_data->glXDestroyContext ||
slouken@1956
   135
        !_this->gl_data->glXMakeCurrent || !_this->gl_data->glXSwapBuffers) {
slouken@1952
   136
        SDL_SetError("Could not retrieve OpenGL functions");
slouken@1952
   137
        return -1;
slouken@1952
   138
    }
slouken@1952
   139
slouken@3057
   140
    /* Initialize extensions */
slouken@3057
   141
    X11_GL_InitExtensions(_this);
slouken@3057
   142
slouken@1952
   143
    return 0;
slouken@1952
   144
}
slouken@1952
   145
slouken@1952
   146
void *
slouken@1952
   147
X11_GL_GetProcAddress(_THIS, const char *proc)
slouken@1952
   148
{
slouken@1952
   149
    void *handle;
slouken@1952
   150
slouken@1952
   151
    handle = _this->gl_config.dll_handle;
slouken@1952
   152
    if (_this->gl_data->glXGetProcAddress) {
slouken@1952
   153
        return _this->gl_data->glXGetProcAddress((const GLubyte *) proc);
slouken@1952
   154
    }
slouken@1952
   155
    return GL_LoadFunction(handle, proc);
slouken@1952
   156
}
slouken@1952
   157
slouken@3057
   158
void
slouken@1952
   159
X11_GL_UnloadLibrary(_THIS)
slouken@1952
   160
{
slouken@3057
   161
    /* Don't actually unload the library, since it may have registered
slouken@3057
   162
     * X11 shutdown hooks, per the notes at:
slouken@3057
   163
     * http://dri.sourceforge.net/doc/DRIuserguide.html
slouken@3057
   164
     */
slouken@3057
   165
#if 0
slouken@3057
   166
    GL_UnloadObject(_this->gl_config.dll_handle);
slouken@3057
   167
    _this->gl_config.dll_handle = NULL;
slouken@3057
   168
#endif
slouken@3057
   169
slouken@3057
   170
    /* Free OpenGL memory */
slouken@3057
   171
    SDL_free(_this->gl_data);
slouken@3057
   172
    _this->gl_data = NULL;
slouken@1952
   173
}
slouken@1952
   174
slouken@1952
   175
static SDL_bool
slouken@1952
   176
HasExtension(const char *extension, const char *extensions)
slouken@1952
   177
{
slouken@1952
   178
    const char *start;
slouken@1952
   179
    const char *where, *terminator;
slouken@1952
   180
slouken@1952
   181
    /* Extension names should not have spaces. */
slouken@1952
   182
    where = SDL_strchr(extension, ' ');
slouken@1952
   183
    if (where || *extension == '\0')
slouken@1952
   184
        return SDL_FALSE;
slouken@1952
   185
slouken@1952
   186
    if (!extensions)
slouken@1952
   187
        return SDL_FALSE;
slouken@1952
   188
slouken@1952
   189
    /* It takes a bit of care to be fool-proof about parsing the
slouken@1952
   190
     * OpenGL extensions string. Don't be fooled by sub-strings,
slouken@1952
   191
     * etc. */
slouken@1952
   192
slouken@1952
   193
    start = extensions;
slouken@1952
   194
slouken@1952
   195
    for (;;) {
slouken@1952
   196
        where = SDL_strstr(start, extension);
slouken@1952
   197
        if (!where)
slouken@1952
   198
            break;
slouken@1952
   199
slouken@1952
   200
        terminator = where + SDL_strlen(extension);
slouken@1952
   201
        if (where == start || *(where - 1) == ' ')
slouken@1952
   202
            if (*terminator == ' ' || *terminator == '\0')
slouken@1952
   203
                return SDL_TRUE;
slouken@1952
   204
slouken@1952
   205
        start = terminator;
slouken@1952
   206
    }
slouken@1952
   207
    return SDL_FALSE;
slouken@1952
   208
}
slouken@1952
   209
slouken@1952
   210
static void
slouken@1952
   211
X11_GL_InitExtensions(_THIS)
slouken@1952
   212
{
slouken@1952
   213
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   214
    int screen = ((SDL_DisplayData *) SDL_CurrentDisplay.driverdata)->screen;
slouken@1952
   215
    XVisualInfo *vinfo;
slouken@1952
   216
    XSetWindowAttributes xattr;
slouken@1952
   217
    Window w;
slouken@1952
   218
    GLXContext context;
slouken@1952
   219
    const char *(*glXQueryExtensionsStringFunc) (Display *, int);
slouken@1952
   220
    const char *extensions;
slouken@1952
   221
slouken@1952
   222
    vinfo = X11_GL_GetVisual(_this, display, screen);
slouken@1952
   223
    if (!vinfo) {
slouken@1952
   224
        return;
slouken@1952
   225
    }
slouken@1952
   226
    xattr.background_pixel = 0;
slouken@1952
   227
    xattr.border_pixel = 0;
slouken@1952
   228
    xattr.colormap =
slouken@1952
   229
        XCreateColormap(display, RootWindow(display, screen), vinfo->visual,
slouken@1952
   230
                        AllocNone);
slouken@1952
   231
    w = XCreateWindow(display, RootWindow(display, screen), 0, 0, 32, 32, 0,
slouken@1952
   232
                      vinfo->depth, InputOutput, vinfo->visual,
slouken@1952
   233
                      (CWBackPixel | CWBorderPixel | CWColormap), &xattr);
slouken@1952
   234
    context = _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
slouken@1952
   235
    if (context) {
slouken@1952
   236
        _this->gl_data->glXMakeCurrent(display, w, context);
slouken@1952
   237
    }
slouken@1952
   238
    XFree(vinfo);
slouken@1952
   239
slouken@1952
   240
    glXQueryExtensionsStringFunc =
slouken@1952
   241
        (const char *(*)(Display *, int)) X11_GL_GetProcAddress(_this,
slouken@1952
   242
                                                                "glXQueryExtensionsString");
slouken@1952
   243
    if (glXQueryExtensionsStringFunc) {
slouken@1952
   244
        extensions = glXQueryExtensionsStringFunc(display, screen);
slouken@1952
   245
    } else {
slouken@1952
   246
        extensions = NULL;
slouken@1952
   247
    }
slouken@1952
   248
slouken@1952
   249
    /* Check for SGI_swap_control */
icculus@2105
   250
    if (HasExtension("GLX_SGI_swap_control", extensions)) {
slouken@1952
   251
        _this->gl_data->glXSwapIntervalSGI =
slouken@1952
   252
            (int (*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");
slouken@1952
   253
    }
slouken@1952
   254
slouken@1952
   255
    /* Check for GLX_MESA_swap_control */
slouken@1952
   256
    if (HasExtension("GLX_MESA_swap_control", extensions)) {
slouken@1952
   257
        _this->gl_data->glXSwapIntervalMESA =
slouken@1952
   258
            (GLint(*)(unsigned)) X11_GL_GetProcAddress(_this,
slouken@1952
   259
                                                       "glXSwapIntervalMESA");
slouken@1952
   260
        _this->gl_data->glXGetSwapIntervalMESA =
slouken@1952
   261
            (GLint(*)(void)) X11_GL_GetProcAddress(_this,
slouken@1952
   262
                                                   "glXGetSwapIntervalMESA");
slouken@1952
   263
    }
slouken@1952
   264
slouken@1952
   265
    /* Check for GLX_EXT_visual_rating */
slouken@1952
   266
    if (HasExtension("GLX_EXT_visual_rating", extensions)) {
slouken@1952
   267
        _this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;
slouken@1952
   268
    }
slouken@1952
   269
slouken@1952
   270
    if (context) {
slouken@1952
   271
        _this->gl_data->glXMakeCurrent(display, None, NULL);
slouken@1952
   272
        _this->gl_data->glXDestroyContext(display, context);
slouken@1952
   273
    }
slouken@1952
   274
    XDestroyWindow(display, w);
bob@2323
   275
    X11_PumpEvents(_this);
slouken@1952
   276
}
slouken@1952
   277
slouken@1952
   278
XVisualInfo *
slouken@1952
   279
X11_GL_GetVisual(_THIS, Display * display, int screen)
slouken@1952
   280
{
slouken@1952
   281
    XVisualInfo *vinfo;
slouken@1952
   282
slouken@1952
   283
    /* 64 seems nice. */
slouken@1952
   284
    int attribs[64];
slouken@3100
   285
    int i = 0;
slouken@3100
   286
    
slouken@1952
   287
    /* Setup our GLX attributes according to the gl_config. */
slouken@1952
   288
    attribs[i++] = GLX_RGBA;
slouken@1952
   289
    attribs[i++] = GLX_RED_SIZE;
slouken@1952
   290
    attribs[i++] = _this->gl_config.red_size;
slouken@1952
   291
    attribs[i++] = GLX_GREEN_SIZE;
slouken@1952
   292
    attribs[i++] = _this->gl_config.green_size;
slouken@1952
   293
    attribs[i++] = GLX_BLUE_SIZE;
slouken@1952
   294
    attribs[i++] = _this->gl_config.blue_size;
slouken@1952
   295
slouken@1952
   296
    if (_this->gl_config.alpha_size) {
slouken@1952
   297
        attribs[i++] = GLX_ALPHA_SIZE;
slouken@1952
   298
        attribs[i++] = _this->gl_config.alpha_size;
slouken@1952
   299
    }
slouken@1952
   300
slouken@1952
   301
    if (_this->gl_config.buffer_size) {
slouken@1952
   302
        attribs[i++] = GLX_BUFFER_SIZE;
slouken@1952
   303
        attribs[i++] = _this->gl_config.buffer_size;
slouken@1952
   304
    }
slouken@1952
   305
slouken@1952
   306
    if (_this->gl_config.double_buffer) {
slouken@1952
   307
        attribs[i++] = GLX_DOUBLEBUFFER;
slouken@1952
   308
    }
slouken@1952
   309
slouken@1952
   310
    attribs[i++] = GLX_DEPTH_SIZE;
slouken@1952
   311
    attribs[i++] = _this->gl_config.depth_size;
slouken@1952
   312
slouken@1952
   313
    if (_this->gl_config.stencil_size) {
slouken@1952
   314
        attribs[i++] = GLX_STENCIL_SIZE;
slouken@1952
   315
        attribs[i++] = _this->gl_config.stencil_size;
slouken@1952
   316
    }
slouken@1952
   317
slouken@1952
   318
    if (_this->gl_config.accum_red_size) {
slouken@1952
   319
        attribs[i++] = GLX_ACCUM_RED_SIZE;
slouken@1952
   320
        attribs[i++] = _this->gl_config.accum_red_size;
slouken@1952
   321
    }
slouken@1952
   322
slouken@1952
   323
    if (_this->gl_config.accum_green_size) {
slouken@1952
   324
        attribs[i++] = GLX_ACCUM_GREEN_SIZE;
slouken@1952
   325
        attribs[i++] = _this->gl_config.accum_green_size;
slouken@1952
   326
    }
slouken@1952
   327
slouken@1952
   328
    if (_this->gl_config.accum_blue_size) {
slouken@1952
   329
        attribs[i++] = GLX_ACCUM_BLUE_SIZE;
slouken@1952
   330
        attribs[i++] = _this->gl_config.accum_blue_size;
slouken@1952
   331
    }
slouken@1952
   332
slouken@1952
   333
    if (_this->gl_config.accum_alpha_size) {
slouken@1952
   334
        attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
slouken@1952
   335
        attribs[i++] = _this->gl_config.accum_alpha_size;
slouken@1952
   336
    }
slouken@1952
   337
slouken@1952
   338
    if (_this->gl_config.stereo) {
slouken@1952
   339
        attribs[i++] = GLX_STEREO;
slouken@1952
   340
    }
slouken@1952
   341
slouken@1952
   342
    if (_this->gl_config.multisamplebuffers) {
slouken@1952
   343
        attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
slouken@1952
   344
        attribs[i++] = _this->gl_config.multisamplebuffers;
slouken@1952
   345
    }
slouken@1952
   346
slouken@1952
   347
    if (_this->gl_config.multisamplesamples) {
slouken@1952
   348
        attribs[i++] = GLX_SAMPLES_ARB;
slouken@1952
   349
        attribs[i++] = _this->gl_config.multisamplesamples;
slouken@1952
   350
    }
slouken@1952
   351
slouken@1952
   352
    if (_this->gl_config.accelerated >= 0
slouken@1952
   353
        && _this->gl_data->HAS_GLX_EXT_visual_rating) {
slouken@1952
   354
        attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
slouken@1952
   355
        attribs[i++] = GLX_NONE_EXT;
slouken@1952
   356
    }
slouken@1952
   357
#ifdef GLX_DIRECT_COLOR         /* Try for a DirectColor visual for gamma support */
slouken@2963
   358
    if (X11_UseDirectColorVisuals()) {
slouken@1952
   359
        attribs[i++] = GLX_X_VISUAL_TYPE;
slouken@1952
   360
        attribs[i++] = GLX_DIRECT_COLOR;
slouken@1952
   361
    }
slouken@1952
   362
#endif
slouken@1952
   363
    attribs[i++] = None;
slouken@1952
   364
slouken@1952
   365
    vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
slouken@1952
   366
#ifdef GLX_DIRECT_COLOR
slouken@2963
   367
    if (!vinfo && X11_UseDirectColorVisuals()) {        /* No DirectColor visual?  Try again.. */
slouken@1952
   368
        attribs[i - 3] = None;
slouken@1952
   369
        vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
slouken@1952
   370
    }
slouken@1952
   371
#endif
slouken@1952
   372
    if (!vinfo) {
slouken@1952
   373
        SDL_SetError("Couldn't find matching GLX visual");
slouken@1952
   374
    }
slouken@1952
   375
    return vinfo;
slouken@1952
   376
}
slouken@1952
   377
slouken@1952
   378
SDL_GLContext
slouken@1952
   379
X11_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1952
   380
{
slouken@1952
   381
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   382
    Display *display = data->videodata->display;
slouken@1952
   383
    int screen =
slouken@3013
   384
        ((SDL_DisplayData *) SDL_GetDisplayFromWindow(window)->
slouken@3013
   385
         driverdata)->screen;
slouken@1952
   386
    XWindowAttributes xattr;
slouken@1952
   387
    XVisualInfo v, *vinfo;
slouken@1952
   388
    int n;
slouken@1952
   389
    GLXContext context = NULL;
slouken@1952
   390
slouken@1955
   391
    /* We do this to create a clean separation between X and GLX errors. */
slouken@1952
   392
    XSync(display, False);
slouken@1952
   393
    XGetWindowAttributes(display, data->window, &xattr);
slouken@1952
   394
    v.screen = screen;
slouken@1952
   395
    v.visualid = XVisualIDFromVisual(xattr.visual);
slouken@1952
   396
    vinfo = XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);
slouken@1952
   397
    if (vinfo) {
slouken@3100
   398
        if (_this->gl_config.major_version < 3) {        
slouken@3100
   399
            context =
slouken@3100
   400
                _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
slouken@3100
   401
        } else {
slouken@3100
   402
            /* If we want a GL 3.0 context or later we need to get a temporary
slouken@3100
   403
               context to grab the new context creation function */
slouken@3100
   404
            GLXContext temp_context = _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
slouken@3100
   405
            if (!temp_context) {
slouken@3100
   406
                SDL_SetError("Could not create GL context");        
slouken@3100
   407
                return NULL;
slouken@3100
   408
            } else {
slouken@3100
   409
                int attribs[] = {
slouken@3100
   410
                    GLX_CONTEXT_MAJOR_VERSION_ARB, _this->gl_config.major_version,
slouken@3100
   411
                    GLX_CONTEXT_MINOR_VERSION_ARB, _this->gl_config.minor_version,
slouken@3100
   412
                    0 
slouken@3100
   413
                };
slouken@3100
   414
                                
slouken@3100
   415
                /* Get a pointer to the context creation function for GL 3.0 */
slouken@3105
   416
                PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs = (PFNGLXCREATECONTEXTATTRIBSARBPROC)_this->gl_data->glXGetProcAddress((GLubyte*)"glXCreateContextAttribsARB");
slouken@3100
   417
                if (!glXCreateContextAttribs) {
slouken@3100
   418
                    SDL_SetError("GL 3.x is not supported");
slouken@3100
   419
                    context = temp_context;
slouken@3100
   420
                } else {
slouken@3105
   421
                    /* Create a GL 3.x context */
slouken@3100
   422
                    GLXFBConfig *framebuffer_config = NULL;
slouken@3100
   423
                    int fbcount = 0;                
slouken@3105
   424
                    GLXFBConfig* (*glXChooseFBConfig)(Display* disp, int screen, const int* attrib_list, int* nelements);
slouken@3105
   425
slouken@3105
   426
                    glXChooseFBConfig = (GLXFBConfig* (*)(Display*, int, const int*, int*))_this->gl_data->glXGetProcAddress((GLubyte*)"glXChooseFBConfig");
slouken@3105
   427
slouken@3105
   428
                    if (!glXChooseFBConfig || !(framebuffer_config = glXChooseFBConfig(display, DefaultScreen(display), NULL, &fbcount))) {
slouken@3105
   429
                        SDL_SetError("No good framebuffers found. GL 3.x disabled");
slouken@3100
   430
                        context = temp_context;
slouken@3100
   431
                    } else {                                    
slouken@3100
   432
                        context = glXCreateContextAttribs(display, framebuffer_config[0], NULL, True, attribs);
slouken@3105
   433
                        _this->gl_data->glXDestroyContext(display, temp_context);
slouken@3100
   434
                    }
slouken@3100
   435
                }
slouken@3100
   436
            }
slouken@3100
   437
        }
slouken@1952
   438
        XFree(vinfo);
slouken@1952
   439
    }
slouken@1952
   440
    XSync(display, False);
slouken@1952
   441
slouken@1952
   442
    if (!context) {
slouken@1952
   443
        SDL_SetError("Could not create GL context");
slouken@2178
   444
        return NULL;
slouken@1952
   445
    }
slouken@2178
   446
slouken@2178
   447
    if (X11_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   448
        X11_GL_DeleteContext(_this, context);
slouken@2178
   449
        return NULL;
slouken@2178
   450
    }
slouken@2178
   451
slouken@2178
   452
    return context;
slouken@1952
   453
}
slouken@1952
   454
slouken@1952
   455
int
slouken@1952
   456
X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1952
   457
{
slouken@1952
   458
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   459
    Window drawable =
slouken@1952
   460
        (window ? ((SDL_WindowData *) window->driverdata)->window : None);
slouken@1952
   461
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   462
    int status;
slouken@1952
   463
slouken@1952
   464
    status = 0;
slouken@1952
   465
    if (!_this->gl_data->glXMakeCurrent(display, drawable, glx_context)) {
slouken@1952
   466
        SDL_SetError("Unable to make GL context current");
slouken@1952
   467
        status = -1;
slouken@1952
   468
    }
slouken@1952
   469
    XSync(display, False);
slouken@1952
   470
slouken@1952
   471
    return (status);
slouken@1952
   472
}
slouken@1952
   473
bob@2327
   474
/* 
bob@2327
   475
   0 is a valid argument to glxSwapIntervalMESA and setting it to 0
bob@2327
   476
   with the MESA version of the extension will undo the effect of a
bob@2327
   477
   previous call with a value that is greater than zero (or at least
bob@2327
   478
   that is what the FM says. OTOH, 0 is an invalid argument to
bob@2327
   479
   glxSwapIntervalSGI and it returns an error if you call it with 0 as
bob@2327
   480
   an argument.
bob@2327
   481
*/
bob@2327
   482
bob@2327
   483
static int swapinterval = -1;
slouken@1952
   484
int
slouken@1952
   485
X11_GL_SetSwapInterval(_THIS, int interval)
slouken@1952
   486
{
slouken@1952
   487
    int status;
slouken@1952
   488
slouken@1952
   489
    if (_this->gl_data->glXSwapIntervalMESA) {
slouken@1952
   490
        status = _this->gl_data->glXSwapIntervalMESA(interval);
slouken@1952
   491
        if (status != 0) {
slouken@1952
   492
            SDL_SetError("glxSwapIntervalMESA failed");
slouken@1952
   493
            status = -1;
bob@2327
   494
        } else {
bob@2327
   495
            swapinterval = interval;
slouken@1952
   496
        }
slouken@1952
   497
    } else if (_this->gl_data->glXSwapIntervalSGI) {
slouken@1952
   498
        status = _this->gl_data->glXSwapIntervalSGI(interval);
slouken@1952
   499
        if (status != 0) {
slouken@1952
   500
            SDL_SetError("glxSwapIntervalSGI failed");
slouken@1952
   501
            status = -1;
bob@2327
   502
        } else {
bob@2327
   503
            swapinterval = interval;
slouken@1952
   504
        }
slouken@1952
   505
    } else {
slouken@1952
   506
        SDL_Unsupported();
slouken@1952
   507
        status = -1;
slouken@1952
   508
    }
slouken@1952
   509
    return status;
slouken@1952
   510
}
slouken@1952
   511
slouken@1952
   512
int
slouken@1952
   513
X11_GL_GetSwapInterval(_THIS)
slouken@1952
   514
{
slouken@1952
   515
    if (_this->gl_data->glXGetSwapIntervalMESA) {
slouken@1952
   516
        return _this->gl_data->glXGetSwapIntervalMESA();
slouken@1952
   517
    } else {
bob@2327
   518
        return swapinterval;
slouken@1952
   519
    }
slouken@1952
   520
}
slouken@1952
   521
slouken@1952
   522
void
slouken@1952
   523
X11_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1952
   524
{
slouken@1952
   525
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   526
    Display *display = data->videodata->display;
slouken@1952
   527
slouken@1952
   528
    _this->gl_data->glXSwapBuffers(display, data->window);
slouken@1952
   529
}
slouken@1952
   530
slouken@1952
   531
void
slouken@1952
   532
X11_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1952
   533
{
slouken@1952
   534
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   535
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   536
slouken@1952
   537
    _this->gl_data->glXDestroyContext(display, glx_context);
bob@2324
   538
    XSync(display, False);
slouken@1952
   539
}
slouken@1952
   540
slouken@1952
   541
#endif /* SDL_VIDEO_OPENGL_GLX */
slouken@1952
   542
slouken@1952
   543
/* vi: set ts=4 sw=4 expandtab: */