swrast.c revision b11a8ea863612827fe04b636f1c2eae9e1536fbd 
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_array_object
67#define need_GL_ARB_vertex_program
68#define need_GL_ARB_sync
69#define need_GL_APPLE_vertex_array_object
70#define need_GL_ATI_fragment_shader
71#define need_GL_ATI_separate_stencil
72#define need_GL_EXT_depth_bounds_test
73#define need_GL_EXT_framebuffer_object
74#define need_GL_EXT_framebuffer_blit
75#define need_GL_EXT_gpu_program_parameters
76#define need_GL_EXT_paletted_texture
77#define need_GL_EXT_stencil_two_side
78#define need_GL_MESA_resize_buffers
79#define need_GL_NV_vertex_program
80#define need_GL_NV_fragment_program
81
82#include "extension_helper.h"
83
84const struct dri_extension card_extensions[] =
85{
86    { "GL_VERSION_1_3",			GL_VERSION_1_3_functions },
87    { "GL_VERSION_1_4",			GL_VERSION_1_4_functions },
88    { "GL_VERSION_1_5",			GL_VERSION_1_5_functions },
89    { "GL_VERSION_2_0",			GL_VERSION_2_0_functions },
90    { "GL_VERSION_2_1",			GL_VERSION_2_1_functions },
91
92    { "GL_EXT_blend_color",		GL_EXT_blend_color_functions },
93    { "GL_EXT_blend_minmax",		GL_EXT_blend_minmax_functions },
94    { "GL_EXT_convolution",		GL_EXT_convolution_functions },
95    { "GL_EXT_histogram",		GL_EXT_histogram_functions },
96    { "GL_SGI_color_table",		GL_SGI_color_table_functions },
97
98    { "GL_ARB_depth_clamp",		NULL },
99    { "GL_ARB_shader_objects",		GL_ARB_shader_objects_functions },
100    { "GL_ARB_vertex_array_object",	GL_ARB_vertex_array_object_functions },
101    { "GL_ARB_vertex_program",		GL_ARB_vertex_program_functions },
102    { "GL_ARB_sync",			GL_ARB_sync_functions },
103    { "GL_APPLE_vertex_array_object",	GL_APPLE_vertex_array_object_functions },
104    { "GL_ATI_fragment_shader",		GL_ATI_fragment_shader_functions },
105    { "GL_ATI_separate_stencil",	GL_ATI_separate_stencil_functions },
106    { "GL_EXT_depth_bounds_test",	GL_EXT_depth_bounds_test_functions },
107    { "GL_EXT_framebuffer_object",	GL_EXT_framebuffer_object_functions },
108    { "GL_EXT_framebuffer_blit",	GL_EXT_framebuffer_blit_functions },
109    { "GL_EXT_gpu_program_parameters",	GL_EXT_gpu_program_parameters_functions },
110    { "GL_EXT_paletted_texture",	GL_EXT_paletted_texture_functions },
111    { "GL_EXT_stencil_two_side",	GL_EXT_stencil_two_side_functions },
112    { "GL_MESA_resize_buffers",		GL_MESA_resize_buffers_functions },
113    { "GL_NV_depth_clamp",		NULL },
114    { "GL_NV_vertex_program",		GL_NV_vertex_program_functions },
115    { "GL_NV_fragment_program",		GL_NV_fragment_program_functions },
116    { NULL,				NULL }
117};
118
119
120/**
121 * Screen and config-related functions
122 */
123
124static void
125setupLoaderExtensions(__DRIscreen *psp,
126		      const __DRIextension **extensions)
127{
128    int i;
129
130    for (i = 0; extensions[i]; i++) {
131	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
132	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
133    }
134}
135
136static __DRIconfig **
137swrastFillInModes(__DRIscreen *psp,
138		  unsigned pixel_bits, unsigned depth_bits,
139		  unsigned stencil_bits, GLboolean have_back_buffer)
140{
141    __DRIconfig **configs;
142    unsigned depth_buffer_factor;
143    unsigned back_buffer_factor;
144    GLenum fb_format;
145    GLenum fb_type;
146
147    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
148     * support pageflipping at all.
149     */
150    static const GLenum back_buffer_modes[] = {
151	GLX_NONE, GLX_SWAP_UNDEFINED_OML
152    };
153
154    uint8_t depth_bits_array[4];
155    uint8_t stencil_bits_array[4];
156    uint8_t msaa_samples_array[1];
157
158    depth_bits_array[0] = 0;
159    depth_bits_array[1] = 0;
160    depth_bits_array[2] = depth_bits;
161    depth_bits_array[3] = depth_bits;
162
163    /* Just like with the accumulation buffer, always provide some modes
164     * with a stencil buffer.
165     */
166    stencil_bits_array[0] = 0;
167    stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
168    stencil_bits_array[2] = 0;
169    stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
170
171    msaa_samples_array[0] = 0;
172
173    depth_buffer_factor = 4;
174    back_buffer_factor = 2;
175
176    switch (pixel_bits) {
177    case 8:
178	fb_format = GL_RGB;
179	fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
180	break;
181    case 16:
182	fb_format = GL_RGB;
183	fb_type = GL_UNSIGNED_SHORT_5_6_5;
184	break;
185    case 24:
186	fb_format = GL_BGR;
187	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
188	break;
189    case 32:
190	fb_format = GL_BGRA;
191	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
192	break;
193    default:
194	fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
195		pixel_bits);
196	return NULL;
197    }
198
199    configs = driCreateConfigs(fb_format, fb_type,
200			       depth_bits_array, stencil_bits_array,
201			       depth_buffer_factor, back_buffer_modes,
202			       back_buffer_factor, msaa_samples_array, 1);
203    if (configs == NULL) {
204	fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
205		__LINE__);
206	return NULL;
207    }
208
209    return configs;
210}
211
212static __DRIscreen *
213driCreateNewScreen(int scrn, const __DRIextension **extensions,
214		   const __DRIconfig ***driver_configs, void *data)
215{
216    static const __DRIextension *emptyExtensionList[] = { NULL };
217    __DRIscreen *psp;
218    __DRIconfig **configs8, **configs16, **configs24, **configs32;
219
220    (void) data;
221
222    TRACE;
223
224    psp = _mesa_calloc(sizeof(*psp));
225    if (!psp)
226	return NULL;
227
228    setupLoaderExtensions(psp, extensions);
229
230    psp->num = scrn;
231    psp->extensions = emptyExtensionList;
232
233    configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
234    configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
235    configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
236    configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
237
238    configs16 = driConcatConfigs(configs8, configs16);
239    configs24 = driConcatConfigs(configs16, configs24);
240    *driver_configs = (const __DRIconfig **)
241       driConcatConfigs(configs24, configs32);
242
243    driInitExtensions( NULL, card_extensions, GL_FALSE );
244
245    return psp;
246}
247
248static void driDestroyScreen(__DRIscreen *psp)
249{
250    TRACE;
251
252    if (psp) {
253	_mesa_free(psp);
254    }
255}
256
257static const __DRIextension **driGetExtensions(__DRIscreen *psp)
258{
259    TRACE;
260
261    return psp->extensions;
262}
263
264
265/**
266 * Framebuffer and renderbuffer-related functions.
267 */
268
269static GLuint
270choose_pixel_format(const GLvisual *v)
271{
272    if (v->rgbMode) {
273	int depth = v->rgbBits;
274
275	if (depth == 32
276	    && v->redMask   == 0xff0000
277	    && v->greenMask == 0x00ff00
278	    && v->blueMask  == 0x0000ff)
279	    return PF_A8R8G8B8;
280	else if (depth == 24
281	    && v->redMask   == 0xff0000
282	    && v->greenMask == 0x00ff00
283	    && v->blueMask  == 0x0000ff)
284	    return PF_X8R8G8B8;
285	else if (depth == 16
286	    && v->redMask   == 0xf800
287	    && v->greenMask == 0x07e0
288	    && v->blueMask  == 0x001f)
289	    return PF_R5G6B5;
290	else if (depth == 8
291	    && v->redMask   == 0x07
292	    && v->greenMask == 0x38
293	    && v->blueMask  == 0xc0)
294	    return PF_R3G3B2;
295    }
296    else {
297	if (v->indexBits == 8)
298	    return PF_CI8;
299    }
300
301    _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
302    return 0;
303}
304
305static void
306swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
307{
308    TRACE;
309
310    _mesa_free(rb->Data);
311    _mesa_free(rb);
312}
313
314static GLboolean
315swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
316			   GLenum internalFormat, GLuint width, GLuint height)
317{
318    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
319    unsigned mask = PITCH_ALIGN_BITS - 1;
320
321    TRACE;
322
323    rb->Data = NULL;
324    rb->Width = width;
325    rb->Height = height;
326
327    /* always pad to PITCH_ALIGN_BITS */
328    xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
329
330    return GL_TRUE;
331}
332
333static GLboolean
334swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
335			  GLenum internalFormat, GLuint width, GLuint height)
336{
337    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
338
339    TRACE;
340
341    _mesa_free(rb->Data);
342
343    swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
344
345    rb->Data = _mesa_malloc(height * xrb->pitch);
346
347    return GL_TRUE;
348}
349
350static struct swrast_renderbuffer *
351swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
352{
353    struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
354    GLuint pixel_format;
355
356    TRACE;
357
358    if (!xrb)
359	return NULL;
360
361    _mesa_init_renderbuffer(&xrb->Base, 0);
362
363    pixel_format = choose_pixel_format(visual);
364
365    xrb->Base.Delete = swrast_delete_renderbuffer;
366    if (front) {
367	xrb->Base.AllocStorage = swrast_alloc_front_storage;
368	swrast_set_span_funcs_front(xrb, pixel_format);
369    }
370    else {
371	xrb->Base.AllocStorage = swrast_alloc_back_storage;
372	swrast_set_span_funcs_back(xrb, pixel_format);
373    }
374
375    switch (pixel_format) {
376    case PF_A8R8G8B8:
377	xrb->Base.InternalFormat = GL_RGBA;
378	xrb->Base._BaseFormat = GL_RGBA;
379	xrb->Base.DataType = GL_UNSIGNED_BYTE;
380	xrb->Base.RedBits   = 8 * sizeof(GLubyte);
381	xrb->Base.GreenBits = 8 * sizeof(GLubyte);
382	xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
383	xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
384	xrb->bpp = 32;
385	break;
386    case PF_X8R8G8B8:
387	xrb->Base.InternalFormat = GL_RGB;
388	xrb->Base._BaseFormat = GL_RGB;
389	xrb->Base.DataType = GL_UNSIGNED_BYTE;
390	xrb->Base.RedBits   = 8 * sizeof(GLubyte);
391	xrb->Base.GreenBits = 8 * sizeof(GLubyte);
392	xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
393	xrb->Base.AlphaBits = 0;
394	xrb->bpp = 32;
395	break;
396    case PF_R5G6B5:
397	xrb->Base.InternalFormat = GL_RGB;
398	xrb->Base._BaseFormat = GL_RGB;
399	xrb->Base.DataType = GL_UNSIGNED_BYTE;
400	xrb->Base.RedBits   = 5 * sizeof(GLubyte);
401	xrb->Base.GreenBits = 6 * sizeof(GLubyte);
402	xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
403	xrb->Base.AlphaBits = 0;
404	xrb->bpp = 16;
405	break;
406    case PF_R3G3B2:
407	xrb->Base.InternalFormat = GL_RGB;
408	xrb->Base._BaseFormat = GL_RGB;
409	xrb->Base.DataType = GL_UNSIGNED_BYTE;
410	xrb->Base.RedBits   = 3 * sizeof(GLubyte);
411	xrb->Base.GreenBits = 3 * sizeof(GLubyte);
412	xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
413	xrb->Base.AlphaBits = 0;
414	xrb->bpp = 8;
415	break;
416    case PF_CI8:
417	xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
418	xrb->Base._BaseFormat = GL_COLOR_INDEX;
419	xrb->Base.DataType = GL_UNSIGNED_BYTE;
420	xrb->Base.IndexBits = 8 * sizeof(GLubyte);
421	xrb->bpp = 8;
422	break;
423    default:
424	return NULL;
425    }
426
427    return xrb;
428}
429
430static __DRIdrawable *
431driCreateNewDrawable(__DRIscreen *screen,
432		     const __DRIconfig *config, void *data)
433{
434    __DRIdrawable *buf;
435    struct swrast_renderbuffer *frontrb, *backrb;
436
437    TRACE;
438
439    buf = _mesa_calloc(sizeof *buf);
440    if (!buf)
441	return NULL;
442
443    buf->loaderPrivate = data;
444
445    buf->driScreenPriv = screen;
446
447    buf->row = _mesa_malloc(MAX_WIDTH * 4);
448
449    /* basic framebuffer setup */
450    _mesa_initialize_framebuffer(&buf->Base, &config->modes);
451
452    /* add front renderbuffer */
453    frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
454    _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
455
456    /* add back renderbuffer */
457    if (config->modes.doubleBufferMode) {
458	backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
459	_mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
460    }
461
462    /* add software renderbuffers */
463    _mesa_add_soft_renderbuffers(&buf->Base,
464				 GL_FALSE, /* color */
465				 config->modes.haveDepthBuffer,
466				 config->modes.haveStencilBuffer,
467				 config->modes.haveAccumBuffer,
468				 GL_FALSE, /* alpha */
469				 GL_FALSE /* aux bufs */);
470
471    return buf;
472}
473
474static void
475driDestroyDrawable(__DRIdrawable *buf)
476{
477    TRACE;
478
479    if (buf) {
480	struct gl_framebuffer *fb = &buf->Base;
481
482	_mesa_free(buf->row);
483
484	fb->DeletePending = GL_TRUE;
485	_mesa_reference_framebuffer(&fb, NULL);
486    }
487}
488
489static void driSwapBuffers(__DRIdrawable *buf)
490{
491    GET_CURRENT_CONTEXT(ctx);
492
493    struct swrast_renderbuffer *frontrb =
494	swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
495    struct swrast_renderbuffer *backrb =
496	swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
497
498    __DRIscreen *screen = buf->driScreenPriv;
499
500    TRACE;
501
502    /* check for signle-buffered */
503    if (backrb == NULL)
504	return;
505
506    /* check if swapping currently bound buffer */
507    if (ctx && ctx->DrawBuffer == &(buf->Base)) {
508	/* flush pending rendering */
509	_mesa_notifySwapBuffers(ctx);
510    }
511
512    screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
513				    0, 0,
514				    frontrb->Base.Width,
515				    frontrb->Base.Height,
516				    backrb->Base.Data,
517				    buf->loaderPrivate);
518}
519
520
521/**
522 * General device driver functions.
523 */
524
525static void
526get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
527{
528    __DRIdrawable *buf = swrast_drawable(fb);
529    __DRIscreen *screen = buf->driScreenPriv;
530    int x, y;
531
532    screen->swrast_loader->getDrawableInfo(buf,
533					   &x, &y, w, h,
534					   buf->loaderPrivate);
535}
536
537static void
538swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
539{
540    GLsizei width, height;
541
542    get_window_size(fb, &width, &height);
543    if (fb->Width != width || fb->Height != height) {
544	_mesa_resize_framebuffer(ctx, fb, width, height);
545    }
546}
547
548static const GLubyte *
549get_string(GLcontext *ctx, GLenum pname)
550{
551    (void) ctx;
552    switch (pname) {
553	case GL_VENDOR:
554	    return (const GLubyte *) "Mesa Project";
555	case GL_RENDERER:
556	    return (const GLubyte *) "Software Rasterizer";
557	default:
558	    return NULL;
559    }
560}
561
562static void
563update_state( GLcontext *ctx, GLuint new_state )
564{
565    /* not much to do here - pass it on */
566    _swrast_InvalidateState( ctx, new_state );
567    _swsetup_InvalidateState( ctx, new_state );
568    _vbo_InvalidateState( ctx, new_state );
569    _tnl_InvalidateState( ctx, new_state );
570}
571
572static void
573viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
574{
575    GLframebuffer *draw = ctx->WinSysDrawBuffer;
576    GLframebuffer *read = ctx->WinSysReadBuffer;
577
578    swrast_check_and_update_window_size(ctx, draw);
579    swrast_check_and_update_window_size(ctx, read);
580}
581
582static void
583swrast_init_driver_functions(struct dd_function_table *driver)
584{
585    driver->GetString = get_string;
586    driver->UpdateState = update_state;
587    driver->GetBufferSize = NULL;
588    driver->Viewport = viewport;
589}
590
591
592/**
593 * Context-related functions.
594 */
595
596static __DRIcontext *
597driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
598		    __DRIcontext *shared, void *data)
599{
600    __DRIcontext *ctx;
601    GLcontext *mesaCtx;
602    struct dd_function_table functions;
603
604    TRACE;
605
606    ctx = _mesa_calloc(sizeof *ctx);
607    if (!ctx)
608	return NULL;
609
610    ctx->loaderPrivate = data;
611
612    ctx->driScreenPriv = screen;
613
614    /* build table of device driver functions */
615    _mesa_init_driver_functions(&functions);
616    swrast_init_driver_functions(&functions);
617
618    if (!_mesa_initialize_context(&ctx->Base, &config->modes,
619				  shared ? &shared->Base : NULL,
620				  &functions, (void *) ctx)) {
621      _mesa_free(ctx);
622      return NULL;
623    }
624
625    mesaCtx = &ctx->Base;
626
627    /* do bounds checking to prevent segfaults and server crashes! */
628    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
629
630    /* create module contexts */
631    _swrast_CreateContext( mesaCtx );
632    _vbo_CreateContext( mesaCtx );
633    _tnl_CreateContext( mesaCtx );
634    _swsetup_CreateContext( mesaCtx );
635    _swsetup_Wakeup( mesaCtx );
636
637    /* use default TCL pipeline */
638    {
639       TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
640       tnl->Driver.RunPipeline = _tnl_run_pipeline;
641    }
642
643    _mesa_enable_sw_extensions(mesaCtx);
644    _mesa_enable_1_3_extensions(mesaCtx);
645    _mesa_enable_1_4_extensions(mesaCtx);
646    _mesa_enable_1_5_extensions(mesaCtx);
647    _mesa_enable_2_0_extensions(mesaCtx);
648    _mesa_enable_2_1_extensions(mesaCtx);
649
650    return ctx;
651}
652
653static void
654driDestroyContext(__DRIcontext *ctx)
655{
656    GLcontext *mesaCtx;
657    TRACE;
658
659    if (ctx) {
660	mesaCtx = &ctx->Base;
661	_swsetup_DestroyContext( mesaCtx );
662	_swrast_DestroyContext( mesaCtx );
663	_tnl_DestroyContext( mesaCtx );
664	_vbo_DestroyContext( mesaCtx );
665	_mesa_destroy_context( mesaCtx );
666    }
667}
668
669static int
670driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
671{
672    TRACE;
673
674    _mesa_copy_context(&src->Base, &dst->Base, mask);
675    return GL_TRUE;
676}
677
678static int driBindContext(__DRIcontext *ctx,
679			  __DRIdrawable *draw,
680			  __DRIdrawable *read)
681{
682    GLcontext *mesaCtx;
683    GLframebuffer *mesaDraw;
684    GLframebuffer *mesaRead;
685    TRACE;
686
687    if (ctx) {
688	if (!draw || !read)
689	    return GL_FALSE;
690
691	mesaCtx = &ctx->Base;
692	mesaDraw = &draw->Base;
693	mesaRead = &read->Base;
694
695	/* check for same context and buffer */
696	if (mesaCtx == _mesa_get_current_context()
697	    && mesaCtx->DrawBuffer == mesaDraw
698	    && mesaCtx->ReadBuffer == mesaRead) {
699	    return GL_TRUE;
700	}
701
702	_glapi_check_multithread();
703
704	swrast_check_and_update_window_size(mesaCtx, mesaDraw);
705	if (read != draw)
706	    swrast_check_and_update_window_size(mesaCtx, mesaRead);
707
708	_mesa_make_current( mesaCtx,
709			    mesaDraw,
710			    mesaRead );
711    }
712    else {
713	/* unbind */
714	_mesa_make_current( NULL, NULL, NULL );
715    }
716
717    return GL_TRUE;
718}
719
720static int driUnbindContext(__DRIcontext *ctx)
721{
722    TRACE;
723    (void) ctx;
724    return GL_TRUE;
725}
726
727
728static const __DRIcoreExtension driCoreExtension = {
729    { __DRI_CORE, __DRI_CORE_VERSION },
730    NULL, /* driCreateNewScreen */
731    driDestroyScreen,
732    driGetExtensions,
733    driGetConfigAttrib,
734    driIndexConfigAttrib,
735    NULL, /* driCreateNewDrawable */
736    driDestroyDrawable,
737    driSwapBuffers,
738    driCreateNewContext,
739    driCopyContext,
740    driDestroyContext,
741    driBindContext,
742    driUnbindContext
743};
744
745static const __DRIswrastExtension driSWRastExtension = {
746    { __DRI_SWRAST, __DRI_SWRAST_VERSION },
747    driCreateNewScreen,
748    driCreateNewDrawable
749};
750
751/* This is the table of extensions that the loader will dlsym() for. */
752PUBLIC const __DRIextension *__driDriverExtensions[] = {
753    &driCoreExtension.base,
754    &driSWRastExtension.base,
755    NULL
756};
757