swrast.c revision 6e0f9001fe3fb191c2928bd09aa9e9d05ddf4ea9 
1/*
2 * Copyright 2008, 2010 George Sapountzis <gsapountzis@gmail.com>
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/formats.h"
37#include "main/framebuffer.h"
38#include "main/imports.h"
39#include "main/renderbuffer.h"
40#include "swrast/swrast.h"
41#include "swrast_setup/swrast_setup.h"
42#include "tnl/tnl.h"
43#include "tnl/t_context.h"
44#include "tnl/t_pipeline.h"
45#include "vbo/vbo.h"
46#include "drivers/common/driverfuncs.h"
47#include "drivers/common/meta.h"
48#include "utils.h"
49
50#include "main/teximage.h"
51#include "main/texformat.h"
52#include "main/texstate.h"
53
54#include "swrast_priv.h"
55#include "swrast/s_context.h"
56
57
58/**
59 * Screen and config-related functions
60 */
61
62static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
63				GLint texture_format, __DRIdrawable *dPriv)
64{
65    struct dri_context *dri_ctx;
66    int x, y, w, h;
67    __DRIscreen *sPriv = dPriv->driScreenPriv;
68    struct gl_texture_unit *texUnit;
69    struct gl_texture_object *texObj;
70    struct gl_texture_image *texImage;
71    struct swrast_texture_image *swImage;
72    uint32_t internalFormat;
73    gl_format texFormat;
74
75    dri_ctx = pDRICtx->driverPrivate;
76
77    internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
78
79    texUnit = _mesa_get_current_tex_unit(&dri_ctx->Base);
80    texObj = _mesa_select_tex_object(&dri_ctx->Base, texUnit, target);
81    texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
82    swImage = swrast_texture_image(texImage);
83
84    _mesa_lock_texture(&dri_ctx->Base, texObj);
85
86    sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
87
88    if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
89	texFormat = MESA_FORMAT_XRGB8888;
90    else
91	texFormat = MESA_FORMAT_ARGB8888;
92
93    _mesa_init_teximage_fields(&dri_ctx->Base, target, texImage,
94			       w, h, 1, 0, internalFormat, texFormat);
95
96    sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Data,
97				   dPriv->loaderPrivate);
98
99    _mesa_unlock_texture(&dri_ctx->Base, texObj);
100}
101
102static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
103			       __DRIdrawable *dPriv)
104{
105    swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
106}
107
108static const __DRItexBufferExtension swrastTexBufferExtension = {
109    { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
110    swrastSetTexBuffer,
111    swrastSetTexBuffer2,
112};
113
114static const __DRIextension *dri_screen_extensions[] = {
115    &swrastTexBufferExtension.base,
116    NULL
117};
118
119static __DRIconfig **
120swrastFillInModes(__DRIscreen *psp,
121		  unsigned pixel_bits, unsigned depth_bits,
122		  unsigned stencil_bits, GLboolean have_back_buffer)
123{
124    __DRIconfig **configs;
125    unsigned depth_buffer_factor;
126    unsigned back_buffer_factor;
127    GLenum fb_format;
128    GLenum fb_type;
129
130    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
131     * support pageflipping at all.
132     */
133    static const GLenum back_buffer_modes[] = {
134	GLX_NONE, GLX_SWAP_UNDEFINED_OML
135    };
136
137    uint8_t depth_bits_array[4];
138    uint8_t stencil_bits_array[4];
139    uint8_t msaa_samples_array[1];
140
141    (void) psp;
142    (void) have_back_buffer;
143
144    depth_bits_array[0] = 0;
145    depth_bits_array[1] = 0;
146    depth_bits_array[2] = depth_bits;
147    depth_bits_array[3] = depth_bits;
148
149    /* Just like with the accumulation buffer, always provide some modes
150     * with a stencil buffer.
151     */
152    stencil_bits_array[0] = 0;
153    stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
154    stencil_bits_array[2] = 0;
155    stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
156
157    msaa_samples_array[0] = 0;
158
159    depth_buffer_factor = 4;
160    back_buffer_factor = 2;
161
162    switch (pixel_bits) {
163    case 8:
164	fb_format = GL_RGB;
165	fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
166	break;
167    case 16:
168	fb_format = GL_RGB;
169	fb_type = GL_UNSIGNED_SHORT_5_6_5;
170	break;
171    case 24:
172	fb_format = GL_BGR;
173	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
174	break;
175    case 32:
176	fb_format = GL_BGRA;
177	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
178	break;
179    default:
180	fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
181		pixel_bits);
182	return NULL;
183    }
184
185    configs = driCreateConfigs(fb_format, fb_type,
186			       depth_bits_array, stencil_bits_array,
187			       depth_buffer_factor, back_buffer_modes,
188			       back_buffer_factor, msaa_samples_array, 1,
189			       GL_TRUE);
190    if (configs == NULL) {
191	fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
192		__LINE__);
193	return NULL;
194    }
195
196    return configs;
197}
198
199static const __DRIconfig **
200dri_init_screen(__DRIscreen * psp)
201{
202    __DRIconfig **configs8, **configs16, **configs24, **configs32;
203
204    TRACE;
205
206    psp->extensions = dri_screen_extensions;
207
208    configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
209    configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
210    configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
211    configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
212
213    configs16 = driConcatConfigs(configs8, configs16);
214    configs24 = driConcatConfigs(configs16, configs24);
215    configs32 = driConcatConfigs(configs24, configs32);
216
217    return (const __DRIconfig **)configs32;
218}
219
220static void
221dri_destroy_screen(__DRIscreen * sPriv)
222{
223    TRACE;
224    (void) sPriv;
225}
226
227
228/**
229 * Framebuffer and renderbuffer-related functions.
230 */
231
232static GLuint
233choose_pixel_format(const struct gl_config *v)
234{
235    int depth = v->rgbBits;
236
237    if (depth == 32
238	&& v->redMask   == 0xff0000
239	&& v->greenMask == 0x00ff00
240	&& v->blueMask  == 0x0000ff)
241	return PF_A8R8G8B8;
242    else if (depth == 24
243	     && v->redMask   == 0xff0000
244	     && v->greenMask == 0x00ff00
245	     && v->blueMask  == 0x0000ff)
246	return PF_X8R8G8B8;
247    else if (depth == 16
248	     && v->redMask   == 0xf800
249	     && v->greenMask == 0x07e0
250	     && v->blueMask  == 0x001f)
251	return PF_R5G6B5;
252    else if (depth == 8
253	     && v->redMask   == 0x07
254	     && v->greenMask == 0x38
255	     && v->blueMask  == 0xc0)
256	return PF_R3G3B2;
257
258    _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
259    return 0;
260}
261
262static void
263swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
264{
265    TRACE;
266
267    free(rb->Data);
268    free(rb);
269}
270
271/* see bytes_per_line in libGL */
272static INLINE int
273bytes_per_line(unsigned pitch_bits, unsigned mul)
274{
275   unsigned mask = mul - 1;
276
277   return ((pitch_bits + mask) & ~mask) / 8;
278}
279
280static GLboolean
281swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
282			   GLenum internalFormat, GLuint width, GLuint height)
283{
284    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
285
286    TRACE;
287
288    (void) ctx;
289    (void) internalFormat;
290
291    rb->Data = NULL;
292    rb->Width = width;
293    rb->Height = height;
294
295    xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
296
297    return GL_TRUE;
298}
299
300static GLboolean
301swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
302			  GLenum internalFormat, GLuint width, GLuint height)
303{
304    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
305
306    TRACE;
307
308    free(rb->Data);
309
310    swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
311
312    rb->Data = malloc(height * xrb->pitch);
313
314    return GL_TRUE;
315}
316
317static struct swrast_renderbuffer *
318swrast_new_renderbuffer(const struct gl_config *visual, GLboolean front)
319{
320    struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
321    GLuint pixel_format;
322
323    TRACE;
324
325    if (!xrb)
326	return NULL;
327
328    _mesa_init_renderbuffer(&xrb->Base, 0);
329
330    pixel_format = choose_pixel_format(visual);
331
332    xrb->Base.Delete = swrast_delete_renderbuffer;
333    if (front) {
334	xrb->Base.AllocStorage = swrast_alloc_front_storage;
335	swrast_set_span_funcs_front(xrb, pixel_format);
336    }
337    else {
338	xrb->Base.AllocStorage = swrast_alloc_back_storage;
339	swrast_set_span_funcs_back(xrb, pixel_format);
340    }
341
342    switch (pixel_format) {
343    case PF_A8R8G8B8:
344	xrb->Base.Format = MESA_FORMAT_ARGB8888;
345	xrb->Base.InternalFormat = GL_RGBA;
346	xrb->Base._BaseFormat = GL_RGBA;
347	xrb->Base.DataType = GL_UNSIGNED_BYTE;
348	xrb->bpp = 32;
349	break;
350    case PF_X8R8G8B8:
351	xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
352	xrb->Base.InternalFormat = GL_RGB;
353	xrb->Base._BaseFormat = GL_RGB;
354	xrb->Base.DataType = GL_UNSIGNED_BYTE;
355	xrb->bpp = 32;
356	break;
357    case PF_R5G6B5:
358	xrb->Base.Format = MESA_FORMAT_RGB565;
359	xrb->Base.InternalFormat = GL_RGB;
360	xrb->Base._BaseFormat = GL_RGB;
361	xrb->Base.DataType = GL_UNSIGNED_BYTE;
362	xrb->bpp = 16;
363	break;
364    case PF_R3G3B2:
365	xrb->Base.Format = MESA_FORMAT_RGB332;
366	xrb->Base.InternalFormat = GL_RGB;
367	xrb->Base._BaseFormat = GL_RGB;
368	xrb->Base.DataType = GL_UNSIGNED_BYTE;
369	xrb->bpp = 8;
370	break;
371    default:
372	return NULL;
373    }
374
375    return xrb;
376}
377
378static GLboolean
379dri_create_buffer(__DRIscreen * sPriv,
380		  __DRIdrawable * dPriv,
381		  const struct gl_config * visual, GLboolean isPixmap)
382{
383    struct dri_drawable *drawable = NULL;
384    struct gl_framebuffer *fb;
385    struct swrast_renderbuffer *frontrb, *backrb;
386
387    TRACE;
388
389    (void) sPriv;
390    (void) isPixmap;
391
392    drawable = CALLOC_STRUCT(dri_drawable);
393    if (drawable == NULL)
394	goto drawable_fail;
395
396    dPriv->driverPrivate = drawable;
397    drawable->dPriv = dPriv;
398
399    drawable->row = malloc(MAX_WIDTH * 4);
400    if (drawable->row == NULL)
401	goto drawable_fail;
402
403    fb = &drawable->Base;
404
405    /* basic framebuffer setup */
406    _mesa_initialize_window_framebuffer(fb, visual);
407
408    /* add front renderbuffer */
409    frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
410    _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
411
412    /* add back renderbuffer */
413    if (visual->doubleBufferMode) {
414	backrb = swrast_new_renderbuffer(visual, GL_FALSE);
415	_mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
416    }
417
418    /* add software renderbuffers */
419    _mesa_add_soft_renderbuffers(fb,
420				 GL_FALSE, /* color */
421				 visual->haveDepthBuffer,
422				 visual->haveStencilBuffer,
423				 visual->haveAccumBuffer,
424				 GL_FALSE, /* alpha */
425				 GL_FALSE /* aux bufs */);
426
427    return GL_TRUE;
428
429drawable_fail:
430
431    if (drawable)
432	free(drawable->row);
433
434    FREE(drawable);
435
436    return GL_FALSE;
437}
438
439static void
440dri_destroy_buffer(__DRIdrawable * dPriv)
441{
442    TRACE;
443
444    if (dPriv) {
445	struct dri_drawable *drawable = dri_drawable(dPriv);
446	struct gl_framebuffer *fb;
447
448	free(drawable->row);
449
450	fb = &drawable->Base;
451
452	fb->DeletePending = GL_TRUE;
453	_mesa_reference_framebuffer(&fb, NULL);
454    }
455}
456
457static void
458dri_swap_buffers(__DRIdrawable * dPriv)
459{
460    __DRIscreen *sPriv = dPriv->driScreenPriv;
461
462    GET_CURRENT_CONTEXT(ctx);
463
464    struct dri_drawable *drawable = dri_drawable(dPriv);
465    struct gl_framebuffer *fb;
466    struct swrast_renderbuffer *frontrb, *backrb;
467
468    TRACE;
469
470    fb = &drawable->Base;
471
472    frontrb =
473	swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
474    backrb =
475	swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
476
477    /* check for signle-buffered */
478    if (backrb == NULL)
479	return;
480
481    /* check if swapping currently bound buffer */
482    if (ctx && ctx->DrawBuffer == fb) {
483	/* flush pending rendering */
484	_mesa_notifySwapBuffers(ctx);
485    }
486
487    sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
488				   0, 0,
489				   frontrb->Base.Width,
490				   frontrb->Base.Height,
491				   backrb->Base.Data,
492				   dPriv->loaderPrivate);
493}
494
495
496/**
497 * General device driver functions.
498 */
499
500static void
501get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
502{
503    __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
504    __DRIscreen *sPriv = dPriv->driScreenPriv;
505    int x, y;
506
507    sPriv->swrast_loader->getDrawableInfo(dPriv,
508					  &x, &y, w, h,
509					  dPriv->loaderPrivate);
510}
511
512static void
513swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
514{
515    GLsizei width, height;
516
517    get_window_size(fb, &width, &height);
518    if (fb->Width != width || fb->Height != height) {
519	_mesa_resize_framebuffer(ctx, fb, width, height);
520    }
521}
522
523static const GLubyte *
524get_string(struct gl_context *ctx, GLenum pname)
525{
526    (void) ctx;
527    switch (pname) {
528	case GL_VENDOR:
529	    return (const GLubyte *) "Mesa Project";
530	case GL_RENDERER:
531	    return (const GLubyte *) "Software Rasterizer";
532	default:
533	    return NULL;
534    }
535}
536
537static void
538update_state( struct gl_context *ctx, GLuint new_state )
539{
540    /* not much to do here - pass it on */
541    _swrast_InvalidateState( ctx, new_state );
542    _swsetup_InvalidateState( ctx, new_state );
543    _vbo_InvalidateState( ctx, new_state );
544    _tnl_InvalidateState( ctx, new_state );
545}
546
547static void
548viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
549{
550    struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
551    struct gl_framebuffer *read = ctx->WinSysReadBuffer;
552
553    (void) x;
554    (void) y;
555    (void) w;
556    (void) h;
557    swrast_check_and_update_window_size(ctx, draw);
558    swrast_check_and_update_window_size(ctx, read);
559}
560
561static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
562					   GLint internalFormat,
563					   GLenum format,
564					   GLenum type)
565{
566    if (internalFormat == GL_RGB)
567	return MESA_FORMAT_XRGB8888;
568    return _mesa_choose_tex_format(ctx, internalFormat, format, type);
569}
570
571static void
572swrast_init_driver_functions(struct dd_function_table *driver)
573{
574    driver->GetString = get_string;
575    driver->UpdateState = update_state;
576    driver->GetBufferSize = NULL;
577    driver->Viewport = viewport;
578    driver->ChooseTextureFormat = swrastChooseTextureFormat;
579}
580
581static const char *es2_extensions[] = {
582   /* Used by mesa internally (cf all_mesa_extensions in ../common/utils.c) */
583   "GL_ARB_transpose_matrix",
584   "GL_ARB_window_pos",
585   "GL_EXT_blend_func_separate",
586   "GL_EXT_compiled_vertex_array",
587   "GL_EXT_framebuffer_blit",
588   "GL_IBM_multimode_draw_arrays",
589   "GL_MESA_window_pos",
590   "GL_NV_vertex_program",
591
592   /* Required by GLES2 */
593   "GL_ARB_fragment_program",
594   "GL_ARB_fragment_shader",
595   "GL_ARB_shader_objects",
596   "GL_ARB_texture_cube_map",
597   "GL_ARB_texture_non_power_of_two",
598   "GL_ARB_vertex_shader",
599   "GL_EXT_blend_color",
600   "GL_EXT_blend_equation_separate",
601   "GL_EXT_blend_minmax",
602
603   /* Optional GLES2 */
604   "GL_ARB_framebuffer_object",
605   "GL_EXT_texture_filter_anisotropic",
606   "GL_ARB_depth_texture",
607   "GL_EXT_packed_depth_stencil",
608   "GL_EXT_framebuffer_object",
609   NULL,
610};
611
612static void
613InitExtensionsES2(struct gl_context *ctx)
614{
615   int i;
616
617   for (i = 0; es2_extensions[i]; i++)
618      _mesa_enable_extension(ctx, es2_extensions[i]);
619}
620
621/**
622 * Context-related functions.
623 */
624
625static GLboolean
626dri_create_context(gl_api api,
627		   const struct gl_config * visual,
628		   __DRIcontext * cPriv, void *sharedContextPrivate)
629{
630    struct dri_context *ctx = NULL;
631    struct dri_context *share = (struct dri_context *)sharedContextPrivate;
632    struct gl_context *mesaCtx = NULL;
633    struct gl_context *sharedCtx = NULL;
634    struct dd_function_table functions;
635
636    TRACE;
637
638    ctx = CALLOC_STRUCT(dri_context);
639    if (ctx == NULL)
640	goto context_fail;
641
642    cPriv->driverPrivate = ctx;
643    ctx->cPriv = cPriv;
644
645    /* build table of device driver functions */
646    _mesa_init_driver_functions(&functions);
647    swrast_init_driver_functions(&functions);
648
649    if (share) {
650	sharedCtx = &share->Base;
651    }
652
653    mesaCtx = &ctx->Base;
654
655    /* basic context setup */
656    if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions, (void *) cPriv)) {
657	goto context_fail;
658    }
659
660    /* do bounds checking to prevent segfaults and server crashes! */
661    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
662
663    /* create module contexts */
664    _swrast_CreateContext( mesaCtx );
665    _vbo_CreateContext( mesaCtx );
666    _tnl_CreateContext( mesaCtx );
667    _swsetup_CreateContext( mesaCtx );
668    _swsetup_Wakeup( mesaCtx );
669
670    /* use default TCL pipeline */
671    {
672       TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
673       tnl->Driver.RunPipeline = _tnl_run_pipeline;
674    }
675
676    _mesa_meta_init(mesaCtx);
677    _mesa_enable_sw_extensions(mesaCtx);
678
679    switch (api) {
680    case API_OPENGL:
681        _mesa_enable_1_3_extensions(mesaCtx);
682        _mesa_enable_1_4_extensions(mesaCtx);
683        _mesa_enable_1_5_extensions(mesaCtx);
684        _mesa_enable_2_0_extensions(mesaCtx);
685        _mesa_enable_2_1_extensions(mesaCtx);
686        break;
687    case API_OPENGLES:
688        _mesa_enable_1_3_extensions(mesaCtx);
689        _mesa_enable_1_4_extensions(mesaCtx);
690        _mesa_enable_1_5_extensions(mesaCtx);
691
692        break;
693    case API_OPENGLES2:
694        InitExtensionsES2( mesaCtx);
695        break;
696    }
697
698    return GL_TRUE;
699
700context_fail:
701
702    FREE(ctx);
703
704    return GL_FALSE;
705}
706
707static void
708dri_destroy_context(__DRIcontext * cPriv)
709{
710    TRACE;
711
712    if (cPriv) {
713	struct dri_context *ctx = dri_context(cPriv);
714	struct gl_context *mesaCtx;
715
716	mesaCtx = &ctx->Base;
717
718        _mesa_meta_free(mesaCtx);
719	_swsetup_DestroyContext( mesaCtx );
720	_swrast_DestroyContext( mesaCtx );
721	_tnl_DestroyContext( mesaCtx );
722	_vbo_DestroyContext( mesaCtx );
723	_mesa_destroy_context( mesaCtx );
724    }
725}
726
727static GLboolean
728dri_make_current(__DRIcontext * cPriv,
729		 __DRIdrawable * driDrawPriv,
730		 __DRIdrawable * driReadPriv)
731{
732    struct gl_context *mesaCtx;
733    struct gl_framebuffer *mesaDraw;
734    struct gl_framebuffer *mesaRead;
735    TRACE;
736
737    if (cPriv) {
738	struct dri_context *ctx = dri_context(cPriv);
739	struct dri_drawable *draw;
740	struct dri_drawable *read;
741
742	if (!driDrawPriv || !driReadPriv)
743	    return GL_FALSE;
744
745	draw = dri_drawable(driDrawPriv);
746	read = dri_drawable(driReadPriv);
747	mesaCtx = &ctx->Base;
748	mesaDraw = &draw->Base;
749	mesaRead = &read->Base;
750
751	/* check for same context and buffer */
752	if (mesaCtx == _mesa_get_current_context()
753	    && mesaCtx->DrawBuffer == mesaDraw
754	    && mesaCtx->ReadBuffer == mesaRead) {
755	    return GL_TRUE;
756	}
757
758	_glapi_check_multithread();
759
760	swrast_check_and_update_window_size(mesaCtx, mesaDraw);
761	if (mesaRead != mesaDraw)
762	    swrast_check_and_update_window_size(mesaCtx, mesaRead);
763
764	_mesa_make_current( mesaCtx,
765			    mesaDraw,
766			    mesaRead );
767    }
768    else {
769	/* unbind */
770	_mesa_make_current( NULL, NULL, NULL );
771    }
772
773    return GL_TRUE;
774}
775
776static GLboolean
777dri_unbind_context(__DRIcontext * cPriv)
778{
779    TRACE;
780    (void) cPriv;
781
782    /* Unset current context and dispath table */
783    _mesa_make_current(NULL, NULL, NULL);
784
785    return GL_TRUE;
786}
787
788
789const struct __DriverAPIRec driDriverAPI = {
790    .InitScreen = dri_init_screen,
791    .DestroyScreen = dri_destroy_screen,
792    .CreateContext = dri_create_context,
793    .DestroyContext = dri_destroy_context,
794    .CreateBuffer = dri_create_buffer,
795    .DestroyBuffer = dri_destroy_buffer,
796    .SwapBuffers = dri_swap_buffers,
797    .MakeCurrent = dri_make_current,
798    .UnbindContext = dri_unbind_context,
799};
800
801/* This is the table of extensions that the loader will dlsym() for. */
802PUBLIC const __DRIextension *__driDriverExtensions[] = {
803    &driCoreExtension.base,
804    &driSWRastExtension.base,
805    NULL
806};
807