swrast.c revision dca04373c2efb177dbb7dca3ad2b57cb36b2ebe6 
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/s_renderbuffer.h"
42#include "swrast_setup/swrast_setup.h"
43#include "tnl/tnl.h"
44#include "tnl/t_context.h"
45#include "tnl/t_pipeline.h"
46#include "vbo/vbo.h"
47#include "drivers/common/driverfuncs.h"
48#include "drivers/common/meta.h"
49#include "utils.h"
50
51#include "main/teximage.h"
52#include "main/texformat.h"
53#include "main/texstate.h"
54
55#include "swrast_priv.h"
56#include "swrast/s_context.h"
57
58
59/**
60 * Screen and config-related functions
61 */
62
63static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
64				GLint texture_format, __DRIdrawable *dPriv)
65{
66    struct dri_context *dri_ctx;
67    int x, y, w, h;
68    __DRIscreen *sPriv = dPriv->driScreenPriv;
69    struct gl_texture_unit *texUnit;
70    struct gl_texture_object *texObj;
71    struct gl_texture_image *texImage;
72    struct swrast_texture_image *swImage;
73    uint32_t internalFormat;
74    gl_format texFormat;
75
76    dri_ctx = pDRICtx->driverPrivate;
77
78    internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
79
80    texUnit = _mesa_get_current_tex_unit(&dri_ctx->Base);
81    texObj = _mesa_select_tex_object(&dri_ctx->Base, texUnit, target);
82    texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
83    swImage = swrast_texture_image(texImage);
84
85    _mesa_lock_texture(&dri_ctx->Base, texObj);
86
87    sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
88
89    if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
90	texFormat = MESA_FORMAT_XRGB8888;
91    else
92	texFormat = MESA_FORMAT_ARGB8888;
93
94    _mesa_init_teximage_fields(&dri_ctx->Base, texImage,
95			       w, h, 1, 0, internalFormat, texFormat);
96
97    sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Buffer,
98				   dPriv->loaderPrivate);
99
100    _mesa_unlock_texture(&dri_ctx->Base, texObj);
101}
102
103static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
104			       __DRIdrawable *dPriv)
105{
106    swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
107}
108
109static const __DRItexBufferExtension swrastTexBufferExtension = {
110    { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
111    swrastSetTexBuffer,
112    swrastSetTexBuffer2,
113};
114
115static const __DRIextension *dri_screen_extensions[] = {
116    &swrastTexBufferExtension.base,
117    NULL
118};
119
120static __DRIconfig **
121swrastFillInModes(__DRIscreen *psp,
122		  unsigned pixel_bits, unsigned depth_bits,
123		  unsigned stencil_bits, GLboolean have_back_buffer)
124{
125    __DRIconfig **configs;
126    unsigned depth_buffer_factor;
127    unsigned back_buffer_factor;
128    GLenum fb_format;
129    GLenum fb_type;
130
131    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
132     * support pageflipping at all.
133     */
134    static const GLenum back_buffer_modes[] = {
135	GLX_NONE, GLX_SWAP_UNDEFINED_OML
136    };
137
138    uint8_t depth_bits_array[4];
139    uint8_t stencil_bits_array[4];
140    uint8_t msaa_samples_array[1];
141
142    (void) psp;
143    (void) have_back_buffer;
144
145    depth_bits_array[0] = 0;
146    depth_bits_array[1] = 0;
147    depth_bits_array[2] = depth_bits;
148    depth_bits_array[3] = depth_bits;
149
150    /* Just like with the accumulation buffer, always provide some modes
151     * with a stencil buffer.
152     */
153    stencil_bits_array[0] = 0;
154    stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
155    stencil_bits_array[2] = 0;
156    stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
157
158    msaa_samples_array[0] = 0;
159
160    depth_buffer_factor = 4;
161    back_buffer_factor = 2;
162
163    switch (pixel_bits) {
164    case 8:
165	fb_format = GL_RGB;
166	fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
167	break;
168    case 16:
169	fb_format = GL_RGB;
170	fb_type = GL_UNSIGNED_SHORT_5_6_5;
171	break;
172    case 24:
173	fb_format = GL_BGR;
174	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
175	break;
176    case 32:
177	fb_format = GL_BGRA;
178	fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
179	break;
180    default:
181	fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
182		pixel_bits);
183	return NULL;
184    }
185
186    configs = driCreateConfigs(fb_format, fb_type,
187			       depth_bits_array, stencil_bits_array,
188			       depth_buffer_factor, back_buffer_modes,
189			       back_buffer_factor, msaa_samples_array, 1,
190			       GL_TRUE);
191    if (configs == NULL) {
192	fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
193		__LINE__);
194	return NULL;
195    }
196
197    return configs;
198}
199
200static const __DRIconfig **
201dri_init_screen(__DRIscreen * psp)
202{
203    __DRIconfig **configs8, **configs16, **configs24, **configs32;
204
205    TRACE;
206
207    psp->extensions = dri_screen_extensions;
208
209    configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
210    configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
211    configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
212    configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
213
214    configs16 = driConcatConfigs(configs8, configs16);
215    configs24 = driConcatConfigs(configs16, configs24);
216    configs32 = driConcatConfigs(configs24, configs32);
217
218    return (const __DRIconfig **)configs32;
219}
220
221static void
222dri_destroy_screen(__DRIscreen * sPriv)
223{
224    TRACE;
225    (void) sPriv;
226}
227
228
229/**
230 * Framebuffer and renderbuffer-related functions.
231 */
232
233static GLuint
234choose_pixel_format(const struct gl_config *v)
235{
236    int depth = v->rgbBits;
237
238    if (depth == 32
239	&& v->redMask   == 0xff0000
240	&& v->greenMask == 0x00ff00
241	&& v->blueMask  == 0x0000ff)
242	return PF_A8R8G8B8;
243    else if (depth == 24
244	     && v->redMask   == 0xff0000
245	     && v->greenMask == 0x00ff00
246	     && v->blueMask  == 0x0000ff)
247	return PF_X8R8G8B8;
248    else if (depth == 16
249	     && v->redMask   == 0xf800
250	     && v->greenMask == 0x07e0
251	     && v->blueMask  == 0x001f)
252	return PF_R5G6B5;
253    else if (depth == 8
254	     && v->redMask   == 0x07
255	     && v->greenMask == 0x38
256	     && v->blueMask  == 0xc0)
257	return PF_R3G3B2;
258
259    _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
260    return 0;
261}
262
263static void
264swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
265{
266    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
267
268    TRACE;
269
270    free(xrb->Base.Buffer);
271    _mesa_delete_renderbuffer(rb);
272}
273
274/* see bytes_per_line in libGL */
275static INLINE int
276bytes_per_line(unsigned pitch_bits, unsigned mul)
277{
278   unsigned mask = mul - 1;
279
280   return ((pitch_bits + mask) & ~mask) / 8;
281}
282
283static GLboolean
284swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
285			   GLenum internalFormat, GLuint width, GLuint height)
286{
287    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
288
289    TRACE;
290
291    (void) ctx;
292    (void) internalFormat;
293
294    xrb->Base.Buffer = NULL;
295    rb->Width = width;
296    rb->Height = height;
297    xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
298
299    return GL_TRUE;
300}
301
302static GLboolean
303swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
304			  GLenum internalFormat, GLuint width, GLuint height)
305{
306    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
307
308    TRACE;
309
310    free(xrb->Base.Buffer);
311
312    swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
313
314    xrb->Base.Buffer = malloc(height * xrb->pitch);
315
316    return GL_TRUE;
317}
318
319static struct dri_swrast_renderbuffer *
320swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
321			GLboolean front)
322{
323    struct dri_swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
324    struct gl_renderbuffer *rb;
325    GLuint pixel_format;
326
327    TRACE;
328
329    if (!xrb)
330	return NULL;
331
332    rb = &xrb->Base.Base;
333
334    _mesa_init_renderbuffer(rb, 0);
335
336    pixel_format = choose_pixel_format(visual);
337
338    xrb->dPriv = dPriv;
339    xrb->Base.Base.Delete = swrast_delete_renderbuffer;
340    if (front) {
341        rb->AllocStorage = swrast_alloc_front_storage;
342    }
343    else {
344	rb->AllocStorage = swrast_alloc_back_storage;
345    }
346
347    switch (pixel_format) {
348    case PF_A8R8G8B8:
349	rb->Format = MESA_FORMAT_ARGB8888;
350	rb->InternalFormat = GL_RGBA;
351	rb->_BaseFormat = GL_RGBA;
352	xrb->bpp = 32;
353	break;
354    case PF_X8R8G8B8:
355	rb->Format = MESA_FORMAT_ARGB8888; /* XXX */
356	rb->InternalFormat = GL_RGB;
357	rb->_BaseFormat = GL_RGB;
358	xrb->bpp = 32;
359	break;
360    case PF_R5G6B5:
361	rb->Format = MESA_FORMAT_RGB565;
362	rb->InternalFormat = GL_RGB;
363	rb->_BaseFormat = GL_RGB;
364	xrb->bpp = 16;
365	break;
366    case PF_R3G3B2:
367	rb->Format = MESA_FORMAT_RGB332;
368	rb->InternalFormat = GL_RGB;
369	rb->_BaseFormat = GL_RGB;
370	xrb->bpp = 8;
371	break;
372    default:
373	return NULL;
374    }
375
376    return xrb;
377}
378
379static void
380swrast_map_renderbuffer(struct gl_context *ctx,
381			struct gl_renderbuffer *rb,
382			GLuint x, GLuint y, GLuint w, GLuint h,
383			GLbitfield mode,
384			GLubyte **out_map,
385			GLint *out_stride)
386{
387   struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
388   GLubyte *map = xrb->Base.Buffer;
389   int cpp = _mesa_get_format_bytes(rb->Format);
390   int stride = rb->Width * cpp;
391
392   if (rb->AllocStorage == swrast_alloc_front_storage) {
393      __DRIdrawable *dPriv = xrb->dPriv;
394      __DRIscreen *sPriv = dPriv->driScreenPriv;
395
396      xrb->map_mode = mode;
397      xrb->map_x = x;
398      xrb->map_y = y;
399      xrb->map_w = w;
400      xrb->map_h = h;
401
402      stride = w * cpp;
403      xrb->Base.Buffer = malloc(h * stride);
404
405      sPriv->swrast_loader->getImage(dPriv, x, y, w, h,
406				     (char *) xrb->Base.Buffer,
407				     dPriv->loaderPrivate);
408
409      *out_map = xrb->Base.Buffer;
410      *out_stride = stride;
411      return;
412   }
413
414   ASSERT(xrb->Base.Buffer);
415
416   if (rb->AllocStorage == swrast_alloc_back_storage) {
417      map += (rb->Height - 1) * stride;
418      stride = -stride;
419   }
420
421   map += (GLsizei)y * stride;
422   map += (GLsizei)x * cpp;
423
424   *out_map = map;
425   *out_stride = stride;
426}
427
428static void
429swrast_unmap_renderbuffer(struct gl_context *ctx,
430			  struct gl_renderbuffer *rb)
431{
432   struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
433
434   if (rb->AllocStorage == swrast_alloc_front_storage) {
435      __DRIdrawable *dPriv = xrb->dPriv;
436      __DRIscreen *sPriv = dPriv->driScreenPriv;
437
438      if (xrb->map_mode & GL_MAP_WRITE_BIT) {
439	 sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_DRAW,
440					xrb->map_x, xrb->map_y,
441					xrb->map_w, xrb->map_h,
442					(char *) xrb->Base.Buffer,
443					dPriv->loaderPrivate);
444      }
445
446      free(xrb->Base.Buffer);
447      xrb->Base.Buffer = NULL;
448   }
449}
450
451static GLboolean
452dri_create_buffer(__DRIscreen * sPriv,
453		  __DRIdrawable * dPriv,
454		  const struct gl_config * visual, GLboolean isPixmap)
455{
456    struct dri_drawable *drawable = NULL;
457    struct gl_framebuffer *fb;
458    struct dri_swrast_renderbuffer *frontrb, *backrb;
459
460    TRACE;
461
462    (void) sPriv;
463    (void) isPixmap;
464
465    drawable = CALLOC_STRUCT(dri_drawable);
466    if (drawable == NULL)
467	goto drawable_fail;
468
469    dPriv->driverPrivate = drawable;
470    drawable->dPriv = dPriv;
471
472    drawable->row = malloc(SWRAST_MAX_WIDTH * 4);
473    if (drawable->row == NULL)
474	goto drawable_fail;
475
476    fb = &drawable->Base;
477
478    /* basic framebuffer setup */
479    _mesa_initialize_window_framebuffer(fb, visual);
480
481    /* add front renderbuffer */
482    frontrb = swrast_new_renderbuffer(visual, dPriv, GL_TRUE);
483    _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base.Base);
484
485    /* add back renderbuffer */
486    if (visual->doubleBufferMode) {
487	backrb = swrast_new_renderbuffer(visual, dPriv, GL_FALSE);
488	_mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base.Base);
489    }
490
491    /* add software renderbuffers */
492    _swrast_add_soft_renderbuffers(fb,
493                                   GL_FALSE, /* color */
494                                   visual->haveDepthBuffer,
495                                   visual->haveStencilBuffer,
496                                   visual->haveAccumBuffer,
497                                   GL_FALSE, /* alpha */
498                                   GL_FALSE /* aux bufs */);
499
500    return GL_TRUE;
501
502drawable_fail:
503
504    if (drawable)
505	free(drawable->row);
506
507    FREE(drawable);
508
509    return GL_FALSE;
510}
511
512static void
513dri_destroy_buffer(__DRIdrawable * dPriv)
514{
515    TRACE;
516
517    if (dPriv) {
518	struct dri_drawable *drawable = dri_drawable(dPriv);
519	struct gl_framebuffer *fb;
520
521	free(drawable->row);
522
523	fb = &drawable->Base;
524
525	fb->DeletePending = GL_TRUE;
526	_mesa_reference_framebuffer(&fb, NULL);
527    }
528}
529
530static void
531dri_swap_buffers(__DRIdrawable * dPriv)
532{
533    __DRIscreen *sPriv = dPriv->driScreenPriv;
534
535    GET_CURRENT_CONTEXT(ctx);
536
537    struct dri_drawable *drawable = dri_drawable(dPriv);
538    struct gl_framebuffer *fb;
539    struct dri_swrast_renderbuffer *frontrb, *backrb;
540
541    TRACE;
542
543    fb = &drawable->Base;
544
545    frontrb =
546	dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
547    backrb =
548	dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
549
550    /* check for signle-buffered */
551    if (backrb == NULL)
552	return;
553
554    /* check if swapping currently bound buffer */
555    if (ctx && ctx->DrawBuffer == fb) {
556	/* flush pending rendering */
557	_mesa_notifySwapBuffers(ctx);
558    }
559
560    sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
561				   0, 0,
562				   frontrb->Base.Base.Width,
563				   frontrb->Base.Base.Height,
564				   (char *) backrb->Base.Buffer,
565				   dPriv->loaderPrivate);
566}
567
568
569/**
570 * General device driver functions.
571 */
572
573static void
574get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
575{
576    __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
577    __DRIscreen *sPriv = dPriv->driScreenPriv;
578    int x, y;
579
580    sPriv->swrast_loader->getDrawableInfo(dPriv,
581					  &x, &y, w, h,
582					  dPriv->loaderPrivate);
583}
584
585static void
586swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
587{
588    GLsizei width, height;
589
590    get_window_size(fb, &width, &height);
591    if (fb->Width != width || fb->Height != height) {
592	_mesa_resize_framebuffer(ctx, fb, width, height);
593    }
594}
595
596static const GLubyte *
597get_string(struct gl_context *ctx, GLenum pname)
598{
599    (void) ctx;
600    switch (pname) {
601	case GL_VENDOR:
602	    return (const GLubyte *) "Mesa Project";
603	case GL_RENDERER:
604	    return (const GLubyte *) "Software Rasterizer";
605	default:
606	    return NULL;
607    }
608}
609
610static void
611update_state( struct gl_context *ctx, GLuint new_state )
612{
613    /* not much to do here - pass it on */
614    _swrast_InvalidateState( ctx, new_state );
615    _swsetup_InvalidateState( ctx, new_state );
616    _vbo_InvalidateState( ctx, new_state );
617    _tnl_InvalidateState( ctx, new_state );
618}
619
620static void
621viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
622{
623    struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
624    struct gl_framebuffer *read = ctx->WinSysReadBuffer;
625
626    (void) x;
627    (void) y;
628    (void) w;
629    (void) h;
630    swrast_check_and_update_window_size(ctx, draw);
631    swrast_check_and_update_window_size(ctx, read);
632}
633
634static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
635                                           GLenum target,
636					   GLint internalFormat,
637					   GLenum format,
638					   GLenum type)
639{
640    if (internalFormat == GL_RGB)
641	return MESA_FORMAT_XRGB8888;
642    return _mesa_choose_tex_format(ctx, target, internalFormat, format, type);
643}
644
645static void
646swrast_init_driver_functions(struct dd_function_table *driver)
647{
648    driver->GetString = get_string;
649    driver->UpdateState = update_state;
650    driver->GetBufferSize = NULL;
651    driver->Viewport = viewport;
652    driver->ChooseTextureFormat = swrastChooseTextureFormat;
653    driver->MapRenderbuffer = swrast_map_renderbuffer;
654    driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
655}
656
657static const char *es2_extensions[] = {
658   /* Used by mesa internally (cf all_mesa_extensions in ../common/utils.c) */
659   "GL_ARB_transpose_matrix",
660   "GL_ARB_window_pos",
661   "GL_EXT_blend_func_separate",
662   "GL_EXT_compiled_vertex_array",
663   "GL_EXT_framebuffer_blit",
664   "GL_IBM_multimode_draw_arrays",
665   "GL_MESA_window_pos",
666   "GL_NV_vertex_program",
667
668   /* Required by GLES2 */
669   "GL_ARB_fragment_program",
670   "GL_ARB_fragment_shader",
671   "GL_ARB_shader_objects",
672   "GL_ARB_texture_cube_map",
673   "GL_ARB_texture_non_power_of_two",
674   "GL_ARB_vertex_shader",
675   "GL_EXT_blend_color",
676   "GL_EXT_blend_equation_separate",
677   "GL_EXT_blend_minmax",
678
679   /* Optional GLES2 */
680   "GL_ARB_framebuffer_object",
681   "GL_EXT_texture_filter_anisotropic",
682   "GL_ARB_depth_texture",
683   "GL_EXT_packed_depth_stencil",
684   "GL_EXT_framebuffer_object",
685   NULL,
686};
687
688static void
689InitExtensionsES2(struct gl_context *ctx)
690{
691   int i;
692
693   for (i = 0; es2_extensions[i]; i++)
694      _mesa_enable_extension(ctx, es2_extensions[i]);
695}
696
697/**
698 * Context-related functions.
699 */
700
701static GLboolean
702dri_create_context(gl_api api,
703		   const struct gl_config * visual,
704		   __DRIcontext * cPriv,
705		   unsigned major_version,
706		   unsigned minor_version,
707		   uint32_t flags,
708		   unsigned *error,
709		   void *sharedContextPrivate)
710{
711    struct dri_context *ctx = NULL;
712    struct dri_context *share = (struct dri_context *)sharedContextPrivate;
713    struct gl_context *mesaCtx = NULL;
714    struct gl_context *sharedCtx = NULL;
715    struct dd_function_table functions;
716
717    TRACE;
718
719    /* Flag filtering is handled in dri2CreateContextAttribs.
720     */
721    (void) flags;
722
723    switch (api) {
724    case API_OPENGL:
725        if (major_version > 2
726	    || (major_version == 2 && minor_version > 1)) {
727            *error = __DRI_CTX_ERROR_BAD_VERSION;
728            return GL_FALSE;
729        }
730        break;
731    case API_OPENGLES:
732    case API_OPENGLES2:
733        break;
734    case API_OPENGL_CORE:
735        *error = __DRI_CTX_ERROR_BAD_API;
736        return GL_FALSE;
737    }
738
739    ctx = CALLOC_STRUCT(dri_context);
740    if (ctx == NULL) {
741	*error = __DRI_CTX_ERROR_NO_MEMORY;
742	goto context_fail;
743    }
744
745    cPriv->driverPrivate = ctx;
746    ctx->cPriv = cPriv;
747
748    /* build table of device driver functions */
749    _mesa_init_driver_functions(&functions);
750    swrast_init_driver_functions(&functions);
751
752    if (share) {
753	sharedCtx = &share->Base;
754    }
755
756    mesaCtx = &ctx->Base;
757
758    /* basic context setup */
759    if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions, (void *) cPriv)) {
760	*error = __DRI_CTX_ERROR_NO_MEMORY;
761	goto context_fail;
762    }
763
764    /* do bounds checking to prevent segfaults and server crashes! */
765    mesaCtx->Const.CheckArrayBounds = GL_TRUE;
766
767    /* create module contexts */
768    _swrast_CreateContext( mesaCtx );
769    _vbo_CreateContext( mesaCtx );
770    _tnl_CreateContext( mesaCtx );
771    _swsetup_CreateContext( mesaCtx );
772    _swsetup_Wakeup( mesaCtx );
773
774    /* use default TCL pipeline */
775    {
776       TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
777       tnl->Driver.RunPipeline = _tnl_run_pipeline;
778    }
779
780    _mesa_meta_init(mesaCtx);
781    _mesa_enable_sw_extensions(mesaCtx);
782
783    switch (api) {
784    case API_OPENGL_CORE:
785        /* XXX fix me, fall-through for now */
786    case API_OPENGL:
787        _mesa_enable_1_3_extensions(mesaCtx);
788        _mesa_enable_1_4_extensions(mesaCtx);
789        _mesa_enable_1_5_extensions(mesaCtx);
790        _mesa_enable_2_0_extensions(mesaCtx);
791        _mesa_enable_2_1_extensions(mesaCtx);
792        break;
793    case API_OPENGLES:
794        _mesa_enable_1_3_extensions(mesaCtx);
795        _mesa_enable_1_4_extensions(mesaCtx);
796        _mesa_enable_1_5_extensions(mesaCtx);
797
798        break;
799    case API_OPENGLES2:
800        InitExtensionsES2( mesaCtx);
801        break;
802    }
803
804    *error = __DRI_CTX_ERROR_SUCCESS;
805    return GL_TRUE;
806
807context_fail:
808
809    FREE(ctx);
810
811    return GL_FALSE;
812}
813
814static void
815dri_destroy_context(__DRIcontext * cPriv)
816{
817    TRACE;
818
819    if (cPriv) {
820	struct dri_context *ctx = dri_context(cPriv);
821	struct gl_context *mesaCtx;
822
823	mesaCtx = &ctx->Base;
824
825        _mesa_meta_free(mesaCtx);
826	_swsetup_DestroyContext( mesaCtx );
827	_swrast_DestroyContext( mesaCtx );
828	_tnl_DestroyContext( mesaCtx );
829	_vbo_DestroyContext( mesaCtx );
830	_mesa_destroy_context( mesaCtx );
831    }
832}
833
834static GLboolean
835dri_make_current(__DRIcontext * cPriv,
836		 __DRIdrawable * driDrawPriv,
837		 __DRIdrawable * driReadPriv)
838{
839    struct gl_context *mesaCtx;
840    struct gl_framebuffer *mesaDraw;
841    struct gl_framebuffer *mesaRead;
842    TRACE;
843
844    if (cPriv) {
845	struct dri_context *ctx = dri_context(cPriv);
846	struct dri_drawable *draw;
847	struct dri_drawable *read;
848
849	if (!driDrawPriv || !driReadPriv)
850	    return GL_FALSE;
851
852	draw = dri_drawable(driDrawPriv);
853	read = dri_drawable(driReadPriv);
854	mesaCtx = &ctx->Base;
855	mesaDraw = &draw->Base;
856	mesaRead = &read->Base;
857
858	/* check for same context and buffer */
859	if (mesaCtx == _mesa_get_current_context()
860	    && mesaCtx->DrawBuffer == mesaDraw
861	    && mesaCtx->ReadBuffer == mesaRead) {
862	    return GL_TRUE;
863	}
864
865	_glapi_check_multithread();
866
867	swrast_check_and_update_window_size(mesaCtx, mesaDraw);
868	if (mesaRead != mesaDraw)
869	    swrast_check_and_update_window_size(mesaCtx, mesaRead);
870
871	_mesa_make_current( mesaCtx,
872			    mesaDraw,
873			    mesaRead );
874    }
875    else {
876	/* unbind */
877	_mesa_make_current( NULL, NULL, NULL );
878    }
879
880    return GL_TRUE;
881}
882
883static GLboolean
884dri_unbind_context(__DRIcontext * cPriv)
885{
886    TRACE;
887    (void) cPriv;
888
889    /* Unset current context and dispath table */
890    _mesa_make_current(NULL, NULL, NULL);
891
892    return GL_TRUE;
893}
894
895
896const struct __DriverAPIRec driDriverAPI = {
897    .InitScreen = dri_init_screen,
898    .DestroyScreen = dri_destroy_screen,
899    .CreateContext = dri_create_context,
900    .DestroyContext = dri_destroy_context,
901    .CreateBuffer = dri_create_buffer,
902    .DestroyBuffer = dri_destroy_buffer,
903    .SwapBuffers = dri_swap_buffers,
904    .MakeCurrent = dri_make_current,
905    .UnbindContext = dri_unbind_context,
906};
907
908/* This is the table of extensions that the loader will dlsym() for. */
909PUBLIC const __DRIextension *__driDriverExtensions[] = {
910    &driCoreExtension.base,
911    &driSWRastExtension.base,
912    NULL
913};
914