swrast.c revision 5a46e176715b0eae7b8a715e8aec42f5a27214fc 
1/*
2 * Copyright (C) 2008 George Sapountzis <gsap7@yahoo.gr>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 */
21
22/*
23 * DRI software rasterizer
24 *
25 * This is the mesa swrast module packaged into a DRI driver structure.
26 *
27 * The front-buffer is allocated by the loader. The loader provides read/write
28 * callbacks for access to the front-buffer. The driver uses a scratch row for
29 * front-buffer rendering to avoid repeated calls to the loader.
30 *
31 * The back-buffer is allocated by the driver and is private.
32 */
33
34#include "main/context.h"
35#include "main/extensions.h"
36#include "main/framebuffer.h"
37#include "main/imports.h"
38#include "main/renderbuffer.h"
39#include "swrast/swrast.h"
40#include "swrast_setup/swrast_setup.h"
41#include "tnl/tnl.h"
42#include "tnl/t_context.h"
43#include "tnl/t_pipeline.h"
44#include "vbo/vbo.h"
45#include "drivers/common/driverfuncs.h"
46#include "utils.h"
47
48#include "swrast_priv.h"
49
50
51#define need_GL_VERSION_1_3
52#define need_GL_VERSION_1_4
53#define need_GL_VERSION_1_5
54#define need_GL_VERSION_2_0
55#define need_GL_VERSION_2_1
56
57/* sw extensions for imaging */
58#define need_GL_EXT_blend_color
59#define need_GL_EXT_blend_minmax
60#define need_GL_EXT_convolution
61#define need_GL_EXT_histogram
62#define need_GL_SGI_color_table
63
64/* sw extensions not associated with some GL version */
65#define need_GL_ARB_shader_objects
66#define need_GL_ARB_vertex_program
67#define need_GL_APPLE_vertex_array_object
68#define need_GL_ATI_fragment_shader
69#define need_GL_EXT_depth_bounds_test
70#define need_GL_EXT_framebuffer_object
71#define need_GL_EXT_framebuffer_blit
72#define need_GL_EXT_gpu_program_parameters
73#define need_GL_EXT_paletted_texture
74#define need_GL_IBM_multimode_draw_arrays
75#define need_GL_MESA_resize_buffers
76#define need_GL_NV_vertex_program
77#define need_GL_NV_fragment_program
78
79#include "extension_helper.h"
80
81const struct dri_extension card_extensions[] =
82{
83    { "GL_VERSION_1_3",			GL_VERSION_1_3_functions },
84    { "GL_VERSION_1_4",			GL_VERSION_1_4_functions },
85    { "GL_VERSION_1_5",			GL_VERSION_1_5_functions },
86    { "GL_VERSION_2_0",			GL_VERSION_2_0_functions },
87    { "GL_VERSION_2_1",			GL_VERSION_2_1_functions },
88
89    { "GL_EXT_blend_color",		GL_EXT_blend_color_functions },
90    { "GL_EXT_blend_minmax",		GL_EXT_blend_minmax_functions },
91    { "GL_EXT_convolution",		GL_EXT_convolution_functions },
92    { "GL_EXT_histogram",		GL_EXT_histogram_functions },
93    { "GL_SGI_color_table",		GL_SGI_color_table_functions },
94
95    { "GL_ARB_shader_objects",		GL_ARB_shader_objects_functions },
96    { "GL_ARB_vertex_program",		GL_ARB_vertex_program_functions },
97    { "GL_APPLE_vertex_array_object",	GL_APPLE_vertex_array_object_functions },
98    { "GL_ATI_fragment_shader",		GL_ATI_fragment_shader_functions },
99    { "GL_EXT_depth_bounds_test",	GL_EXT_depth_bounds_test_functions },
100    { "GL_EXT_framebuffer_object",	GL_EXT_framebuffer_object_functions },
101    { "GL_EXT_framebuffer_blit",	GL_EXT_framebuffer_blit_functions },
102    { "GL_EXT_gpu_program_parameters",	GL_EXT_gpu_program_parameters_functions },
103    { "GL_EXT_paletted_texture",	GL_EXT_paletted_texture_functions },
104    { "GL_IBM_multimode_draw_arrays",	GL_IBM_multimode_draw_arrays_functions },
105    { "GL_MESA_resize_buffers",		GL_MESA_resize_buffers_functions },
106    { "GL_NV_vertex_program",		GL_NV_vertex_program_functions },
107    { "GL_NV_fragment_program",		GL_NV_fragment_program_functions },
108    { NULL,				NULL }
109};
110
111
112/**
113 * Screen and config-related functions
114 */
115
116static void
117setupLoaderExtensions(__DRIscreen *psp,
118		      const __DRIextension **extensions)
119{
120    int i;
121
122    for (i = 0; extensions[i]; i++) {
123	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
124	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
125    }
126}
127
128static __DRIconfig **
129swrastFillInModes(__DRIscreen *psp,
130		  unsigned pixel_bits, unsigned depth_bits,
131		  unsigned stencil_bits, GLboolean have_back_buffer)
132{
133    __DRIconfig **configs;
134    unsigned depth_buffer_factor;
135    unsigned back_buffer_factor;
136    GLenum fb_format;
137    GLenum fb_type;
138
139    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
140     * support pageflipping at all.
141     */
142    static const GLenum back_buffer_modes[] = {
143	GLX_NONE, GLX_SWAP_UNDEFINED_OML
144    };
145
146    uint8_t depth_bits_array[4];
147    uint8_t stencil_bits_array[4];
148
149    depth_bits_array[0] = 0;
150    depth_bits_array[1] = 0;
151    depth_bits_array[2] = depth_bits;
152    depth_bits_array[3] = depth_bits;
153
154    /* Just like with the accumulation buffer, always provide some modes
155     * with a stencil buffer.
156     */
157    stencil_bits_array[0] = 0;
158    stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
159    stencil_bits_array[2] = 0;
160    stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
161
162    depth_buffer_factor = 4;
163    back_buffer_factor = 2;
164
165    if (pixel_bits == 8) {
166	fb_format = GL_RGB;
167	fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
168    }
169    else if (pixel_bits == 16) {
170	fb_format = GL_RGB;
171	fb_type = GL_UNSIGNED_SHORT_5_6_5;
172    }
173    else {
174	fb_format = GL_BGRA;
175	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
176    }
177
178    configs = driCreateConfigs(fb_format, fb_type,
179			       depth_bits_array, stencil_bits_array,
180			       depth_buffer_factor, back_buffer_modes,
181			       back_buffer_factor);
182    if (configs == NULL) {
183	fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
184		__LINE__);
185	return NULL;
186    }
187
188    return configs;
189}
190
191static __DRIscreen *
192driCreateNewScreen(int scrn, const __DRIextension **extensions,
193		   const __DRIconfig ***driver_configs, void *data)
194{
195    static const __DRIextension *emptyExtensionList[] = { NULL };
196    __DRIscreen *psp;
197    __DRIconfig **configs8, **configs16, **configs32;
198
199    (void) data;
200
201    TRACE;
202
203    psp = _mesa_calloc(sizeof(*psp));
204    if (!psp)
205	return NULL;
206
207    setupLoaderExtensions(psp, extensions);
208
209    psp->num = scrn;
210    psp->extensions = emptyExtensionList;
211
212    configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
213    configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
214    configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
215
216    configs16 = (__DRIconfig **)driConcatConfigs(configs8, configs16);
217
218    *driver_configs = driConcatConfigs(configs16, configs32);
219
220    driInitExtensions( NULL, card_extensions, GL_FALSE );
221
222    return psp;
223}
224
225static void driDestroyScreen(__DRIscreen *psp)
226{
227    TRACE;
228
229    if (psp) {
230	_mesa_free(psp);
231    }
232}
233
234static const __DRIextension **driGetExtensions(__DRIscreen *psp)
235{
236    TRACE;
237
238    return psp->extensions;
239}
240
241
242/**
243 * Framebuffer and renderbuffer-related functions.
244 */
245
246static GLuint
247choose_pixel_format(const GLvisual *v)
248{
249    if (v->rgbMode) {
250	int bpp = v->rgbBits;
251
252	if (bpp == 32
253	    && v->redMask   == 0xff0000
254	    && v->greenMask == 0x00ff00
255	    && v->blueMask  == 0x0000ff)
256	    return PF_A8R8G8B8;
257	else if (bpp == 16
258	    && v->redMask   == 0xf800
259	    && v->greenMask == 0x07e0
260	    && v->blueMask  == 0x001f)
261	    return PF_R5G6B5;
262	else if (bpp == 8
263	    && v->redMask   == 0x07
264	    && v->greenMask == 0x38
265	    && v->blueMask  == 0xc0)
266	    return PF_R3G3B2;
267    }
268    else {
269	if (v->indexBits == 8)
270	    return PF_CI8;
271    }
272
273    _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
274    return 0;
275}
276
277static void
278swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
279{
280    TRACE;
281
282    _mesa_free(rb->Data);
283    _mesa_free(rb);
284}
285
286static GLboolean
287swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
288			   GLenum internalFormat, GLuint width, GLuint height)
289{
290    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
291    int bpp;
292    unsigned mask = PITCH_ALIGN_BITS - 1;
293
294    TRACE;
295
296    rb->Data = NULL;
297    rb->Width = width;
298    rb->Height = height;
299
300    switch (internalFormat) {
301    case GL_RGB:
302	bpp = rb->RedBits + rb->GreenBits + rb->BlueBits;
303	break;
304    case GL_RGBA:
305	bpp = rb->RedBits + rb->GreenBits + rb->BlueBits + rb->AlphaBits;
306	break;
307    case GL_COLOR_INDEX8_EXT:
308	bpp = rb->IndexBits;
309	break;
310    default:
311	_mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
312	return GL_FALSE;
313    }
314
315    /* always pad to PITCH_ALIGN_BITS */
316    xrb->pitch = ((width * bpp + mask) & ~mask) / 8;
317
318    return GL_TRUE;
319}
320
321static GLboolean
322swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
323			  GLenum internalFormat, GLuint width, GLuint height)
324{
325    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
326
327    TRACE;
328
329    _mesa_free(rb->Data);
330
331    swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
332
333    rb->Data = _mesa_malloc(height * xrb->pitch);
334
335    return GL_TRUE;
336}
337
338static struct swrast_renderbuffer *
339swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
340{
341    struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
342    GLuint pixel_format;
343
344    TRACE;
345
346    if (!xrb)
347	return NULL;
348
349    _mesa_init_renderbuffer(&xrb->Base, 0);
350
351    pixel_format = choose_pixel_format(visual);
352
353    xrb->Base.Delete = swrast_delete_renderbuffer;
354    if (front) {
355	xrb->Base.AllocStorage = swrast_alloc_front_storage;
356	swrast_set_span_funcs_front(xrb, pixel_format);
357    }
358    else {
359	xrb->Base.AllocStorage = swrast_alloc_back_storage;
360	swrast_set_span_funcs_back(xrb, pixel_format);
361    }
362
363    switch (pixel_format) {
364    case PF_A8R8G8B8:
365	xrb->Base.InternalFormat = GL_RGBA;
366	xrb->Base._BaseFormat = GL_RGBA;
367	xrb->Base.DataType = GL_UNSIGNED_BYTE;
368	xrb->Base.RedBits   = 8 * sizeof(GLubyte);
369	xrb->Base.GreenBits = 8 * sizeof(GLubyte);
370	xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
371	xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
372	break;
373    case PF_R5G6B5:
374	xrb->Base.InternalFormat = GL_RGB;
375	xrb->Base._BaseFormat = GL_RGB;
376	xrb->Base.DataType = GL_UNSIGNED_BYTE;
377	xrb->Base.RedBits   = 5 * sizeof(GLubyte);
378	xrb->Base.GreenBits = 6 * sizeof(GLubyte);
379	xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
380	xrb->Base.AlphaBits = 0;
381	break;
382    case PF_R3G3B2:
383	xrb->Base.InternalFormat = GL_RGB;
384	xrb->Base._BaseFormat = GL_RGB;
385	xrb->Base.DataType = GL_UNSIGNED_BYTE;
386	xrb->Base.RedBits   = 3 * sizeof(GLubyte);
387	xrb->Base.GreenBits = 3 * sizeof(GLubyte);
388	xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
389	xrb->Base.AlphaBits = 0;
390	break;
391    case PF_CI8:
392	xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
393	xrb->Base._BaseFormat = GL_COLOR_INDEX;
394	xrb->Base.DataType = GL_UNSIGNED_BYTE;
395	xrb->Base.IndexBits = 8 * sizeof(GLubyte);
396	break;
397    default:
398	return NULL;
399    }
400
401    return xrb;
402}
403
404static __DRIdrawable *
405driCreateNewDrawable(__DRIscreen *screen,
406		     const __DRIconfig *config, void *data)
407{
408    __DRIdrawable *buf;
409    struct swrast_renderbuffer *frontrb, *backrb;
410
411    TRACE;
412
413    buf = _mesa_calloc(sizeof *buf);
414    if (!buf)
415	return NULL;
416
417    buf->loaderPrivate = data;
418
419    buf->driScreenPriv = screen;
420
421    buf->row = _mesa_malloc(MAX_WIDTH * 4);
422
423    /* basic framebuffer setup */
424    _mesa_initialize_framebuffer(&buf->Base, &config->modes);
425
426    /* add front renderbuffer */
427    frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
428    _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
429
430    /* add back renderbuffer */
431    if (config->modes.doubleBufferMode) {
432	backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
433	_mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
434    }
435
436    /* add software renderbuffers */
437    _mesa_add_soft_renderbuffers(&buf->Base,
438				 GL_FALSE, /* color */
439				 config->modes.haveDepthBuffer,
440				 config->modes.haveStencilBuffer,
441				 config->modes.haveAccumBuffer,
442				 GL_FALSE, /* alpha */
443				 GL_FALSE /* aux bufs */);
444
445    return buf;
446}
447
448static void
449driDestroyDrawable(__DRIdrawable *buf)
450{
451    TRACE;
452
453    if (buf) {
454	struct gl_framebuffer *fb = &buf->Base;
455
456	_mesa_free(buf->row);
457
458	fb->DeletePending = GL_TRUE;
459	_mesa_unreference_framebuffer(&fb);
460    }
461}
462
463static void driSwapBuffers(__DRIdrawable *buf)
464{
465    GET_CURRENT_CONTEXT(ctx);
466
467    struct swrast_renderbuffer *frontrb =
468	swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
469    struct swrast_renderbuffer *backrb =
470	swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
471
472    __DRIscreen *screen = buf->driScreenPriv;
473
474    TRACE;
475
476    /* check for signle-buffered */
477    if (backrb == NULL)
478	return;
479
480    /* check if swapping currently bound buffer */
481    if (ctx && ctx->DrawBuffer == &(buf->Base)) {
482	/* flush pending rendering */
483	_mesa_notifySwapBuffers(ctx);
484    }
485
486    screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
487				    0, 0,
488				    frontrb->Base.Width,
489				    frontrb->Base.Height,
490				    backrb->Base.Data,
491				    buf->loaderPrivate);
492}
493
494
495/**
496 * General device driver functions.
497 */
498
499static void
500get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
501{
502    __DRIdrawable *buf = swrast_drawable(fb);
503    __DRIscreen *screen = buf->driScreenPriv;
504    int x, y;
505
506    screen->swrast_loader->getDrawableInfo(buf,
507					   &x, &y, w, h,
508					   buf->loaderPrivate);
509}
510
511static void
512swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
513{
514    GLsizei width, height;
515
516    get_window_size(fb, &width, &height);
517    if (fb->Width != width || fb->Height != height) {
518	_mesa_resize_framebuffer(ctx, fb, width, height);
519    }
520}
521
522static const GLubyte *
523get_string(GLcontext *ctx, GLenum pname)
524{
525    (void) ctx;
526    switch (pname) {
527	case GL_VENDOR:
528	    return (const GLubyte *) "Mesa Project";
529	case GL_RENDERER:
530	    return (const GLubyte *) "Software Rasterizer";
531	default:
532	    return NULL;
533    }
534}
535
536static void
537update_state( GLcontext *ctx, GLuint new_state )
538{
539    /* not much to do here - pass it on */
540    _swrast_InvalidateState( ctx, new_state );
541    _swsetup_InvalidateState( ctx, new_state );
542    _vbo_InvalidateState( ctx, new_state );
543    _tnl_InvalidateState( ctx, new_state );
544}
545
546static void
547viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
548{
549    GLframebuffer *draw = ctx->WinSysDrawBuffer;
550    GLframebuffer *read = ctx->WinSysReadBuffer;
551
552    swrast_check_and_update_window_size(ctx, draw);
553    swrast_check_and_update_window_size(ctx, read);
554}
555
556static void
557swrast_init_driver_functions(struct dd_function_table *driver)
558{
559    driver->GetString = get_string;
560    driver->UpdateState = update_state;
561    driver->GetBufferSize = NULL;
562    driver->Viewport = viewport;
563}
564
565
566/**
567 * Context-related functions.
568 */
569
570static __DRIcontext *
571driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
572		    __DRIcontext *shared, void *data)
573{
574    __DRIcontext *ctx;
575    GLcontext *mesaCtx;
576    struct dd_function_table functions;
577
578    TRACE;
579
580    ctx = _mesa_calloc(sizeof *ctx);
581    if (!ctx)
582	return NULL;
583
584    ctx->loaderPrivate = data;
585
586    ctx->driScreenPriv = screen;
587
588    /* build table of device driver functions */
589    _mesa_init_driver_functions(&functions);
590    swrast_init_driver_functions(&functions);
591
592    if (!_mesa_initialize_context(&ctx->Base, &config->modes,
593				  shared ? &shared->Base : NULL,
594				  &functions, (void *) ctx)) {
595      _mesa_free(ctx);
596      return NULL;
597    }
598
599    mesaCtx = &ctx->Base;
600
601    /* do bounds checking to prevent segfaults and server crashes! */
602    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
603
604    /* create module contexts */
605    _swrast_CreateContext( mesaCtx );
606    _vbo_CreateContext( mesaCtx );
607    _tnl_CreateContext( mesaCtx );
608    _swsetup_CreateContext( mesaCtx );
609    _swsetup_Wakeup( mesaCtx );
610
611    /* use default TCL pipeline */
612    {
613       TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
614       tnl->Driver.RunPipeline = _tnl_run_pipeline;
615    }
616
617    _mesa_enable_sw_extensions(mesaCtx);
618    _mesa_enable_1_3_extensions(mesaCtx);
619    _mesa_enable_1_4_extensions(mesaCtx);
620    _mesa_enable_1_5_extensions(mesaCtx);
621    _mesa_enable_2_0_extensions(mesaCtx);
622    _mesa_enable_2_1_extensions(mesaCtx);
623
624    return ctx;
625}
626
627static void
628driDestroyContext(__DRIcontext *ctx)
629{
630    GLcontext *mesaCtx;
631    TRACE;
632
633    if (ctx) {
634	mesaCtx = &ctx->Base;
635	_swsetup_DestroyContext( mesaCtx );
636	_swrast_DestroyContext( mesaCtx );
637	_tnl_DestroyContext( mesaCtx );
638	_vbo_DestroyContext( mesaCtx );
639	_mesa_destroy_context( mesaCtx );
640    }
641}
642
643static int
644driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
645{
646    TRACE;
647
648    _mesa_copy_context(&src->Base, &dst->Base, mask);
649    return GL_TRUE;
650}
651
652static int driBindContext(__DRIcontext *ctx,
653			  __DRIdrawable *draw,
654			  __DRIdrawable *read)
655{
656    GLcontext *mesaCtx;
657    GLframebuffer *mesaDraw;
658    GLframebuffer *mesaRead;
659    TRACE;
660
661    if (ctx) {
662	if (!draw || !read)
663	    return GL_FALSE;
664
665	mesaCtx = &ctx->Base;
666	mesaDraw = &draw->Base;
667	mesaRead = &read->Base;
668
669	/* check for same context and buffer */
670	if (mesaCtx == _mesa_get_current_context()
671	    && mesaCtx->DrawBuffer == mesaDraw
672	    && mesaCtx->ReadBuffer == mesaRead) {
673	    return GL_TRUE;
674	}
675
676	_glapi_check_multithread();
677
678	swrast_check_and_update_window_size(mesaCtx, mesaDraw);
679	if (read != draw)
680	    swrast_check_and_update_window_size(mesaCtx, mesaRead);
681
682	_mesa_make_current( mesaCtx,
683			    mesaDraw,
684			    mesaRead );
685    }
686    else {
687	/* unbind */
688	_mesa_make_current( NULL, NULL, NULL );
689    }
690
691    return GL_TRUE;
692}
693
694static int driUnbindContext(__DRIcontext *ctx)
695{
696    TRACE;
697    (void) ctx;
698    return GL_TRUE;
699}
700
701
702static const __DRIcoreExtension driCoreExtension = {
703    { __DRI_CORE, __DRI_CORE_VERSION },
704    NULL, /* driCreateNewScreen */
705    driDestroyScreen,
706    driGetExtensions,
707    driGetConfigAttrib,
708    driIndexConfigAttrib,
709    NULL, /* driCreateNewDrawable */
710    driDestroyDrawable,
711    driSwapBuffers,
712    driCreateNewContext,
713    driCopyContext,
714    driDestroyContext,
715    driBindContext,
716    driUnbindContext
717};
718
719static const __DRIswrastExtension driSWRastExtension = {
720    { __DRI_SWRAST, __DRI_SWRAST_VERSION },
721    driCreateNewScreen,
722    driCreateNewDrawable
723};
724
725/* This is the table of extensions that the loader will dlsym() for. */
726PUBLIC const __DRIextension *__driDriverExtensions[] = {
727    &driCoreExtension.base,
728    &driSWRastExtension.base,
729    NULL
730};
731