swrast.c revision 92d7ed8a20d4a018ce5324e6537ae7b478b9e5bf 
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_draw_elements_base_vertex
66#define need_GL_ARB_shader_objects
67#define need_GL_ARB_vertex_array_object
68#define need_GL_ARB_vertex_program
69#define need_GL_ARB_sync
70#define need_GL_APPLE_vertex_array_object
71#define need_GL_ATI_fragment_shader
72#define need_GL_ATI_separate_stencil
73#define need_GL_EXT_depth_bounds_test
74#define need_GL_EXT_framebuffer_object
75#define need_GL_EXT_framebuffer_blit
76#define need_GL_EXT_gpu_program_parameters
77#define need_GL_EXT_paletted_texture
78#define need_GL_EXT_stencil_two_side
79#define need_GL_MESA_resize_buffers
80#define need_GL_NV_vertex_program
81#define need_GL_NV_fragment_program
82
83#include "extension_helper.h"
84
85const struct dri_extension card_extensions[] =
86{
87    { "GL_VERSION_1_3",			GL_VERSION_1_3_functions },
88    { "GL_VERSION_1_4",			GL_VERSION_1_4_functions },
89    { "GL_VERSION_1_5",			GL_VERSION_1_5_functions },
90    { "GL_VERSION_2_0",			GL_VERSION_2_0_functions },
91    { "GL_VERSION_2_1",			GL_VERSION_2_1_functions },
92
93    { "GL_EXT_blend_color",		GL_EXT_blend_color_functions },
94    { "GL_EXT_blend_minmax",		GL_EXT_blend_minmax_functions },
95    { "GL_EXT_convolution",		GL_EXT_convolution_functions },
96    { "GL_EXT_histogram",		GL_EXT_histogram_functions },
97    { "GL_SGI_color_table",		GL_SGI_color_table_functions },
98
99    { "GL_ARB_depth_clamp",		NULL },
100    { "GL_ARB_draw_elements_base_vertex", GL_ARB_draw_elements_base_vertex_functions },
101    { "GL_ARB_shader_objects",		GL_ARB_shader_objects_functions },
102    { "GL_ARB_vertex_array_object",	GL_ARB_vertex_array_object_functions },
103    { "GL_ARB_vertex_program",		GL_ARB_vertex_program_functions },
104    { "GL_ARB_sync",			GL_ARB_sync_functions },
105    { "GL_APPLE_vertex_array_object",	GL_APPLE_vertex_array_object_functions },
106    { "GL_ATI_fragment_shader",		GL_ATI_fragment_shader_functions },
107    { "GL_ATI_separate_stencil",	GL_ATI_separate_stencil_functions },
108    { "GL_EXT_depth_bounds_test",	GL_EXT_depth_bounds_test_functions },
109    { "GL_EXT_framebuffer_object",	GL_EXT_framebuffer_object_functions },
110    { "GL_EXT_framebuffer_blit",	GL_EXT_framebuffer_blit_functions },
111    { "GL_EXT_gpu_program_parameters",	GL_EXT_gpu_program_parameters_functions },
112    { "GL_EXT_paletted_texture",	GL_EXT_paletted_texture_functions },
113    { "GL_EXT_stencil_two_side",	GL_EXT_stencil_two_side_functions },
114    { "GL_MESA_resize_buffers",		GL_MESA_resize_buffers_functions },
115    { "GL_NV_depth_clamp",		NULL },
116    { "GL_NV_vertex_program",		GL_NV_vertex_program_functions },
117    { "GL_NV_fragment_program",		GL_NV_fragment_program_functions },
118    { NULL,				NULL }
119};
120
121
122/**
123 * Screen and config-related functions
124 */
125
126static void
127setupLoaderExtensions(__DRIscreen *psp,
128		      const __DRIextension **extensions)
129{
130    int i;
131
132    for (i = 0; extensions[i]; i++) {
133	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
134	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
135    }
136}
137
138static __DRIconfig **
139swrastFillInModes(__DRIscreen *psp,
140		  unsigned pixel_bits, unsigned depth_bits,
141		  unsigned stencil_bits, GLboolean have_back_buffer)
142{
143    __DRIconfig **configs;
144    unsigned depth_buffer_factor;
145    unsigned back_buffer_factor;
146    GLenum fb_format;
147    GLenum fb_type;
148
149    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
150     * support pageflipping at all.
151     */
152    static const GLenum back_buffer_modes[] = {
153	GLX_NONE, GLX_SWAP_UNDEFINED_OML
154    };
155
156    uint8_t depth_bits_array[4];
157    uint8_t stencil_bits_array[4];
158    uint8_t msaa_samples_array[1];
159
160    depth_bits_array[0] = 0;
161    depth_bits_array[1] = 0;
162    depth_bits_array[2] = depth_bits;
163    depth_bits_array[3] = depth_bits;
164
165    /* Just like with the accumulation buffer, always provide some modes
166     * with a stencil buffer.
167     */
168    stencil_bits_array[0] = 0;
169    stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
170    stencil_bits_array[2] = 0;
171    stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
172
173    msaa_samples_array[0] = 0;
174
175    depth_buffer_factor = 4;
176    back_buffer_factor = 2;
177
178    switch (pixel_bits) {
179    case 8:
180	fb_format = GL_RGB;
181	fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
182	break;
183    case 16:
184	fb_format = GL_RGB;
185	fb_type = GL_UNSIGNED_SHORT_5_6_5;
186	break;
187    case 24:
188	fb_format = GL_BGR;
189	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
190	break;
191    case 32:
192	fb_format = GL_BGRA;
193	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
194	break;
195    default:
196	fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
197		pixel_bits);
198	return NULL;
199    }
200
201    configs = driCreateConfigs(fb_format, fb_type,
202			       depth_bits_array, stencil_bits_array,
203			       depth_buffer_factor, back_buffer_modes,
204			       back_buffer_factor, msaa_samples_array, 1);
205    if (configs == NULL) {
206	fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
207		__LINE__);
208	return NULL;
209    }
210
211    return configs;
212}
213
214static __DRIscreen *
215driCreateNewScreen(int scrn, const __DRIextension **extensions,
216		   const __DRIconfig ***driver_configs, void *data)
217{
218    static const __DRIextension *emptyExtensionList[] = { NULL };
219    __DRIscreen *psp;
220    __DRIconfig **configs8, **configs16, **configs24, **configs32;
221
222    (void) data;
223
224    TRACE;
225
226    psp = _mesa_calloc(sizeof(*psp));
227    if (!psp)
228	return NULL;
229
230    setupLoaderExtensions(psp, extensions);
231
232    psp->num = scrn;
233    psp->extensions = emptyExtensionList;
234
235    configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
236    configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
237    configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
238    configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
239
240    configs16 = driConcatConfigs(configs8, configs16);
241    configs24 = driConcatConfigs(configs16, configs24);
242    *driver_configs = (const __DRIconfig **)
243       driConcatConfigs(configs24, configs32);
244
245    driInitExtensions( NULL, card_extensions, GL_FALSE );
246
247    return psp;
248}
249
250static void driDestroyScreen(__DRIscreen *psp)
251{
252    TRACE;
253
254    if (psp) {
255	_mesa_free(psp);
256    }
257}
258
259static const __DRIextension **driGetExtensions(__DRIscreen *psp)
260{
261    TRACE;
262
263    return psp->extensions;
264}
265
266
267/**
268 * Framebuffer and renderbuffer-related functions.
269 */
270
271static GLuint
272choose_pixel_format(const GLvisual *v)
273{
274    if (v->rgbMode) {
275	int depth = v->rgbBits;
276
277	if (depth == 32
278	    && v->redMask   == 0xff0000
279	    && v->greenMask == 0x00ff00
280	    && v->blueMask  == 0x0000ff)
281	    return PF_A8R8G8B8;
282	else if (depth == 24
283	    && v->redMask   == 0xff0000
284	    && v->greenMask == 0x00ff00
285	    && v->blueMask  == 0x0000ff)
286	    return PF_X8R8G8B8;
287	else if (depth == 16
288	    && v->redMask   == 0xf800
289	    && v->greenMask == 0x07e0
290	    && v->blueMask  == 0x001f)
291	    return PF_R5G6B5;
292	else if (depth == 8
293	    && v->redMask   == 0x07
294	    && v->greenMask == 0x38
295	    && v->blueMask  == 0xc0)
296	    return PF_R3G3B2;
297    }
298    else {
299	if (v->indexBits == 8)
300	    return PF_CI8;
301    }
302
303    _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
304    return 0;
305}
306
307static void
308swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
309{
310    TRACE;
311
312    _mesa_free(rb->Data);
313    _mesa_free(rb);
314}
315
316static GLboolean
317swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
318			   GLenum internalFormat, GLuint width, GLuint height)
319{
320    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
321    unsigned mask = PITCH_ALIGN_BITS - 1;
322
323    TRACE;
324
325    rb->Data = NULL;
326    rb->Width = width;
327    rb->Height = height;
328
329    /* always pad to PITCH_ALIGN_BITS */
330    xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
331
332    return GL_TRUE;
333}
334
335static GLboolean
336swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
337			  GLenum internalFormat, GLuint width, GLuint height)
338{
339    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
340
341    TRACE;
342
343    _mesa_free(rb->Data);
344
345    swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
346
347    rb->Data = _mesa_malloc(height * xrb->pitch);
348
349    return GL_TRUE;
350}
351
352static struct swrast_renderbuffer *
353swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
354{
355    struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
356    GLuint pixel_format;
357
358    TRACE;
359
360    if (!xrb)
361	return NULL;
362
363    _mesa_init_renderbuffer(&xrb->Base, 0);
364
365    pixel_format = choose_pixel_format(visual);
366
367    xrb->Base.Delete = swrast_delete_renderbuffer;
368    if (front) {
369	xrb->Base.AllocStorage = swrast_alloc_front_storage;
370	swrast_set_span_funcs_front(xrb, pixel_format);
371    }
372    else {
373	xrb->Base.AllocStorage = swrast_alloc_back_storage;
374	swrast_set_span_funcs_back(xrb, pixel_format);
375    }
376
377    switch (pixel_format) {
378    case PF_A8R8G8B8:
379	xrb->Base.InternalFormat = GL_RGBA;
380	xrb->Base._BaseFormat = GL_RGBA;
381	xrb->Base.DataType = GL_UNSIGNED_BYTE;
382	xrb->Base.RedBits   = 8 * sizeof(GLubyte);
383	xrb->Base.GreenBits = 8 * sizeof(GLubyte);
384	xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
385	xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
386	xrb->bpp = 32;
387	break;
388    case PF_X8R8G8B8:
389	xrb->Base.InternalFormat = GL_RGB;
390	xrb->Base._BaseFormat = GL_RGB;
391	xrb->Base.DataType = GL_UNSIGNED_BYTE;
392	xrb->Base.RedBits   = 8 * sizeof(GLubyte);
393	xrb->Base.GreenBits = 8 * sizeof(GLubyte);
394	xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
395	xrb->Base.AlphaBits = 0;
396	xrb->bpp = 32;
397	break;
398    case PF_R5G6B5:
399	xrb->Base.InternalFormat = GL_RGB;
400	xrb->Base._BaseFormat = GL_RGB;
401	xrb->Base.DataType = GL_UNSIGNED_BYTE;
402	xrb->Base.RedBits   = 5 * sizeof(GLubyte);
403	xrb->Base.GreenBits = 6 * sizeof(GLubyte);
404	xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
405	xrb->Base.AlphaBits = 0;
406	xrb->bpp = 16;
407	break;
408    case PF_R3G3B2:
409	xrb->Base.InternalFormat = GL_RGB;
410	xrb->Base._BaseFormat = GL_RGB;
411	xrb->Base.DataType = GL_UNSIGNED_BYTE;
412	xrb->Base.RedBits   = 3 * sizeof(GLubyte);
413	xrb->Base.GreenBits = 3 * sizeof(GLubyte);
414	xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
415	xrb->Base.AlphaBits = 0;
416	xrb->bpp = 8;
417	break;
418    case PF_CI8:
419	xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
420	xrb->Base._BaseFormat = GL_COLOR_INDEX;
421	xrb->Base.DataType = GL_UNSIGNED_BYTE;
422	xrb->Base.IndexBits = 8 * sizeof(GLubyte);
423	xrb->bpp = 8;
424	break;
425    default:
426	return NULL;
427    }
428
429    return xrb;
430}
431
432static __DRIdrawable *
433driCreateNewDrawable(__DRIscreen *screen,
434		     const __DRIconfig *config, void *data)
435{
436    __DRIdrawable *buf;
437    struct swrast_renderbuffer *frontrb, *backrb;
438
439    TRACE;
440
441    buf = _mesa_calloc(sizeof *buf);
442    if (!buf)
443	return NULL;
444
445    buf->loaderPrivate = data;
446
447    buf->driScreenPriv = screen;
448
449    buf->row = _mesa_malloc(MAX_WIDTH * 4);
450
451    /* basic framebuffer setup */
452    _mesa_initialize_framebuffer(&buf->Base, &config->modes);
453
454    /* add front renderbuffer */
455    frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
456    _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
457
458    /* add back renderbuffer */
459    if (config->modes.doubleBufferMode) {
460	backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
461	_mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
462    }
463
464    /* add software renderbuffers */
465    _mesa_add_soft_renderbuffers(&buf->Base,
466				 GL_FALSE, /* color */
467				 config->modes.haveDepthBuffer,
468				 config->modes.haveStencilBuffer,
469				 config->modes.haveAccumBuffer,
470				 GL_FALSE, /* alpha */
471				 GL_FALSE /* aux bufs */);
472
473    return buf;
474}
475
476static void
477driDestroyDrawable(__DRIdrawable *buf)
478{
479    TRACE;
480
481    if (buf) {
482	struct gl_framebuffer *fb = &buf->Base;
483
484	_mesa_free(buf->row);
485
486	fb->DeletePending = GL_TRUE;
487	_mesa_reference_framebuffer(&fb, NULL);
488    }
489}
490
491static void driSwapBuffers(__DRIdrawable *buf)
492{
493    GET_CURRENT_CONTEXT(ctx);
494
495    struct swrast_renderbuffer *frontrb =
496	swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
497    struct swrast_renderbuffer *backrb =
498	swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
499
500    __DRIscreen *screen = buf->driScreenPriv;
501
502    TRACE;
503
504    /* check for signle-buffered */
505    if (backrb == NULL)
506	return;
507
508    /* check if swapping currently bound buffer */
509    if (ctx && ctx->DrawBuffer == &(buf->Base)) {
510	/* flush pending rendering */
511	_mesa_notifySwapBuffers(ctx);
512    }
513
514    screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
515				    0, 0,
516				    frontrb->Base.Width,
517				    frontrb->Base.Height,
518				    backrb->Base.Data,
519				    buf->loaderPrivate);
520}
521
522
523/**
524 * General device driver functions.
525 */
526
527static void
528get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
529{
530    __DRIdrawable *buf = swrast_drawable(fb);
531    __DRIscreen *screen = buf->driScreenPriv;
532    int x, y;
533
534    screen->swrast_loader->getDrawableInfo(buf,
535					   &x, &y, w, h,
536					   buf->loaderPrivate);
537}
538
539static void
540swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
541{
542    GLsizei width, height;
543
544    get_window_size(fb, &width, &height);
545    if (fb->Width != width || fb->Height != height) {
546	_mesa_resize_framebuffer(ctx, fb, width, height);
547    }
548}
549
550static const GLubyte *
551get_string(GLcontext *ctx, GLenum pname)
552{
553    (void) ctx;
554    switch (pname) {
555	case GL_VENDOR:
556	    return (const GLubyte *) "Mesa Project";
557	case GL_RENDERER:
558	    return (const GLubyte *) "Software Rasterizer";
559	default:
560	    return NULL;
561    }
562}
563
564static void
565update_state( GLcontext *ctx, GLuint new_state )
566{
567    /* not much to do here - pass it on */
568    _swrast_InvalidateState( ctx, new_state );
569    _swsetup_InvalidateState( ctx, new_state );
570    _vbo_InvalidateState( ctx, new_state );
571    _tnl_InvalidateState( ctx, new_state );
572}
573
574static void
575viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
576{
577    GLframebuffer *draw = ctx->WinSysDrawBuffer;
578    GLframebuffer *read = ctx->WinSysReadBuffer;
579
580    swrast_check_and_update_window_size(ctx, draw);
581    swrast_check_and_update_window_size(ctx, read);
582}
583
584static void
585swrast_init_driver_functions(struct dd_function_table *driver)
586{
587    driver->GetString = get_string;
588    driver->UpdateState = update_state;
589    driver->GetBufferSize = NULL;
590    driver->Viewport = viewport;
591}
592
593
594/**
595 * Context-related functions.
596 */
597
598static __DRIcontext *
599driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
600		    __DRIcontext *shared, void *data)
601{
602    __DRIcontext *ctx;
603    GLcontext *mesaCtx;
604    struct dd_function_table functions;
605
606    TRACE;
607
608    ctx = _mesa_calloc(sizeof *ctx);
609    if (!ctx)
610	return NULL;
611
612    ctx->loaderPrivate = data;
613
614    ctx->driScreenPriv = screen;
615
616    /* build table of device driver functions */
617    _mesa_init_driver_functions(&functions);
618    swrast_init_driver_functions(&functions);
619
620    if (!_mesa_initialize_context(&ctx->Base, &config->modes,
621				  shared ? &shared->Base : NULL,
622				  &functions, (void *) ctx)) {
623      _mesa_free(ctx);
624      return NULL;
625    }
626
627    mesaCtx = &ctx->Base;
628
629    /* do bounds checking to prevent segfaults and server crashes! */
630    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
631
632    /* create module contexts */
633    _swrast_CreateContext( mesaCtx );
634    _vbo_CreateContext( mesaCtx );
635    _tnl_CreateContext( mesaCtx );
636    _swsetup_CreateContext( mesaCtx );
637    _swsetup_Wakeup( mesaCtx );
638
639    /* use default TCL pipeline */
640    {
641       TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
642       tnl->Driver.RunPipeline = _tnl_run_pipeline;
643    }
644
645    _mesa_enable_sw_extensions(mesaCtx);
646    _mesa_enable_1_3_extensions(mesaCtx);
647    _mesa_enable_1_4_extensions(mesaCtx);
648    _mesa_enable_1_5_extensions(mesaCtx);
649    _mesa_enable_2_0_extensions(mesaCtx);
650    _mesa_enable_2_1_extensions(mesaCtx);
651
652    return ctx;
653}
654
655static void
656driDestroyContext(__DRIcontext *ctx)
657{
658    GLcontext *mesaCtx;
659    TRACE;
660
661    if (ctx) {
662	mesaCtx = &ctx->Base;
663	_swsetup_DestroyContext( mesaCtx );
664	_swrast_DestroyContext( mesaCtx );
665	_tnl_DestroyContext( mesaCtx );
666	_vbo_DestroyContext( mesaCtx );
667	_mesa_destroy_context( mesaCtx );
668    }
669}
670
671static int
672driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
673{
674    TRACE;
675
676    _mesa_copy_context(&src->Base, &dst->Base, mask);
677    return GL_TRUE;
678}
679
680static int driBindContext(__DRIcontext *ctx,
681			  __DRIdrawable *draw,
682			  __DRIdrawable *read)
683{
684    GLcontext *mesaCtx;
685    GLframebuffer *mesaDraw;
686    GLframebuffer *mesaRead;
687    TRACE;
688
689    if (ctx) {
690	if (!draw || !read)
691	    return GL_FALSE;
692
693	mesaCtx = &ctx->Base;
694	mesaDraw = &draw->Base;
695	mesaRead = &read->Base;
696
697	/* check for same context and buffer */
698	if (mesaCtx == _mesa_get_current_context()
699	    && mesaCtx->DrawBuffer == mesaDraw
700	    && mesaCtx->ReadBuffer == mesaRead) {
701	    return GL_TRUE;
702	}
703
704	_glapi_check_multithread();
705
706	swrast_check_and_update_window_size(mesaCtx, mesaDraw);
707	if (read != draw)
708	    swrast_check_and_update_window_size(mesaCtx, mesaRead);
709
710	_mesa_make_current( mesaCtx,
711			    mesaDraw,
712			    mesaRead );
713    }
714    else {
715	/* unbind */
716	_mesa_make_current( NULL, NULL, NULL );
717    }
718
719    return GL_TRUE;
720}
721
722static int driUnbindContext(__DRIcontext *ctx)
723{
724    TRACE;
725    (void) ctx;
726    return GL_TRUE;
727}
728
729
730static const __DRIcoreExtension driCoreExtension = {
731    { __DRI_CORE, __DRI_CORE_VERSION },
732    NULL, /* driCreateNewScreen */
733    driDestroyScreen,
734    driGetExtensions,
735    driGetConfigAttrib,
736    driIndexConfigAttrib,
737    NULL, /* driCreateNewDrawable */
738    driDestroyDrawable,
739    driSwapBuffers,
740    driCreateNewContext,
741    driCopyContext,
742    driDestroyContext,
743    driBindContext,
744    driUnbindContext
745};
746
747static const __DRIswrastExtension driSWRastExtension = {
748    { __DRI_SWRAST, __DRI_SWRAST_VERSION },
749    driCreateNewScreen,
750    driCreateNewDrawable
751};
752
753/* This is the table of extensions that the loader will dlsym() for. */
754PUBLIC const __DRIextension *__driDriverExtensions[] = {
755    &driCoreExtension.base,
756    &driSWRastExtension.base,
757    NULL
758};
759