st_manager.c revision 848b8605 
1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 2010 LunarG Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *    Chia-I Wu <olv@lunarg.com>
26 */
27
28#include "main/mtypes.h"
29#include "main/extensions.h"
30#include "main/context.h"
31#include "main/texobj.h"
32#include "main/teximage.h"
33#include "main/texstate.h"
34#include "main/errors.h"
35#include "main/framebuffer.h"
36#include "main/fbobject.h"
37#include "main/renderbuffer.h"
38#include "main/version.h"
39#include "st_texture.h"
40
41#include "st_context.h"
42#include "st_extensions.h"
43#include "st_format.h"
44#include "st_cb_fbo.h"
45#include "st_cb_flush.h"
46#include "st_manager.h"
47
48#include "state_tracker/st_gl_api.h"
49
50#include "pipe/p_context.h"
51#include "pipe/p_screen.h"
52#include "util/u_format.h"
53#include "util/u_pointer.h"
54#include "util/u_inlines.h"
55#include "util/u_atomic.h"
56#include "util/u_surface.h"
57
58/**
59 * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
60 * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
61 * We'll only return non-null for window system framebuffers.
62 * Note that this function may fail.
63 */
64static INLINE struct st_framebuffer *
65st_ws_framebuffer(struct gl_framebuffer *fb)
66{
67   /* FBO cannot be casted.  See st_new_framebuffer */
68   if (fb && _mesa_is_winsys_fbo(fb))
69      return (struct st_framebuffer *) fb;
70   return NULL;
71}
72
73/**
74 * Map an attachment to a buffer index.
75 */
76static INLINE gl_buffer_index
77attachment_to_buffer_index(enum st_attachment_type statt)
78{
79   gl_buffer_index index;
80
81   switch (statt) {
82   case ST_ATTACHMENT_FRONT_LEFT:
83      index = BUFFER_FRONT_LEFT;
84      break;
85   case ST_ATTACHMENT_BACK_LEFT:
86      index = BUFFER_BACK_LEFT;
87      break;
88   case ST_ATTACHMENT_FRONT_RIGHT:
89      index = BUFFER_FRONT_RIGHT;
90      break;
91   case ST_ATTACHMENT_BACK_RIGHT:
92      index = BUFFER_BACK_RIGHT;
93      break;
94   case ST_ATTACHMENT_DEPTH_STENCIL:
95      index = BUFFER_DEPTH;
96      break;
97   case ST_ATTACHMENT_ACCUM:
98      index = BUFFER_ACCUM;
99      break;
100   case ST_ATTACHMENT_SAMPLE:
101   default:
102      index = BUFFER_COUNT;
103      break;
104   }
105
106   return index;
107}
108
109/**
110 * Map a buffer index to an attachment.
111 */
112static INLINE enum st_attachment_type
113buffer_index_to_attachment(gl_buffer_index index)
114{
115   enum st_attachment_type statt;
116
117   switch (index) {
118   case BUFFER_FRONT_LEFT:
119      statt = ST_ATTACHMENT_FRONT_LEFT;
120      break;
121   case BUFFER_BACK_LEFT:
122      statt = ST_ATTACHMENT_BACK_LEFT;
123      break;
124   case BUFFER_FRONT_RIGHT:
125      statt = ST_ATTACHMENT_FRONT_RIGHT;
126      break;
127   case BUFFER_BACK_RIGHT:
128      statt = ST_ATTACHMENT_BACK_RIGHT;
129      break;
130   case BUFFER_DEPTH:
131      statt = ST_ATTACHMENT_DEPTH_STENCIL;
132      break;
133   case BUFFER_ACCUM:
134      statt = ST_ATTACHMENT_ACCUM;
135      break;
136   default:
137      statt = ST_ATTACHMENT_INVALID;
138      break;
139   }
140
141   return statt;
142}
143
144/**
145 * Make sure a context picks up the latest cached state of the
146 * drawables it binds to.
147 */
148static void
149st_context_validate(struct st_context *st,
150                    struct st_framebuffer *stdraw,
151                    struct st_framebuffer *stread)
152{
153    if (stdraw && stdraw->stamp != st->draw_stamp) {
154       st->dirty.st |= ST_NEW_FRAMEBUFFER;
155       _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
156                                stdraw->Base.Width,
157                                stdraw->Base.Height);
158       st->draw_stamp = stdraw->stamp;
159    }
160
161    if (stread && stread->stamp != st->read_stamp) {
162       if (stread != stdraw) {
163          st->dirty.st |= ST_NEW_FRAMEBUFFER;
164          _mesa_resize_framebuffer(st->ctx, &stread->Base,
165                                   stread->Base.Width,
166                                   stread->Base.Height);
167       }
168       st->read_stamp = stread->stamp;
169    }
170}
171
172/**
173 * Validate a framebuffer to make sure up-to-date pipe_textures are used.
174 * The context is only used for creating pipe surfaces and for calling
175 * _mesa_resize_framebuffer().
176 * (That should probably be rethought, since those surfaces become
177 * drawable state, not context state, and can be freed by another pipe
178 * context).
179 */
180static void
181st_framebuffer_validate(struct st_framebuffer *stfb,
182                        struct st_context *st)
183{
184   struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
185   uint width, height;
186   unsigned i;
187   boolean changed = FALSE;
188   int32_t new_stamp;
189
190   /* Check for incomplete framebuffers (e.g. EGL_KHR_surfaceless_context) */
191   if (!stfb->iface)
192      return;
193
194   new_stamp = p_atomic_read(&stfb->iface->stamp);
195   if (stfb->iface_stamp == new_stamp)
196      return;
197
198   /* validate the fb */
199   do {
200      if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,
201				 stfb->num_statts, textures))
202	 return;
203
204      stfb->iface_stamp = new_stamp;
205      new_stamp = p_atomic_read(&stfb->iface->stamp);
206   } while(stfb->iface_stamp != new_stamp);
207
208   width = stfb->Base.Width;
209   height = stfb->Base.Height;
210
211   for (i = 0; i < stfb->num_statts; i++) {
212      struct st_renderbuffer *strb;
213      struct pipe_surface *ps, surf_tmpl;
214      gl_buffer_index idx;
215
216      if (!textures[i])
217         continue;
218
219      idx = attachment_to_buffer_index(stfb->statts[i]);
220      if (idx >= BUFFER_COUNT) {
221         pipe_resource_reference(&textures[i], NULL);
222         continue;
223      }
224
225      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
226      assert(strb);
227      if (strb->texture == textures[i]) {
228         pipe_resource_reference(&textures[i], NULL);
229         continue;
230      }
231
232      u_surface_default_template(&surf_tmpl, textures[i]);
233      ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
234      if (ps) {
235         pipe_surface_reference(&strb->surface, ps);
236         pipe_resource_reference(&strb->texture, ps->texture);
237         /* ownership transfered */
238         pipe_surface_reference(&ps, NULL);
239
240         changed = TRUE;
241
242         strb->Base.Width = strb->surface->width;
243         strb->Base.Height = strb->surface->height;
244
245         width = strb->Base.Width;
246         height = strb->Base.Height;
247      }
248
249      pipe_resource_reference(&textures[i], NULL);
250   }
251
252   if (changed) {
253      ++stfb->stamp;
254      _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
255   }
256}
257
258/**
259 * Update the attachments to validate by looping the existing renderbuffers.
260 */
261static void
262st_framebuffer_update_attachments(struct st_framebuffer *stfb)
263{
264   gl_buffer_index idx;
265
266   stfb->num_statts = 0;
267   for (idx = 0; idx < BUFFER_COUNT; idx++) {
268      struct st_renderbuffer *strb;
269      enum st_attachment_type statt;
270
271      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
272      if (!strb || strb->software)
273         continue;
274
275      statt = buffer_index_to_attachment(idx);
276      if (statt != ST_ATTACHMENT_INVALID &&
277          st_visual_have_buffers(stfb->iface->visual, 1 << statt))
278         stfb->statts[stfb->num_statts++] = statt;
279   }
280   stfb->stamp++;
281}
282
283/**
284 * Add a renderbuffer to the framebuffer.
285 */
286static boolean
287st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
288                                gl_buffer_index idx)
289{
290   struct gl_renderbuffer *rb;
291   enum pipe_format format;
292   boolean sw;
293
294   if (!stfb->iface)
295      return FALSE;
296
297   /* do not distinguish depth/stencil buffers */
298   if (idx == BUFFER_STENCIL)
299      idx = BUFFER_DEPTH;
300
301   switch (idx) {
302   case BUFFER_DEPTH:
303      format = stfb->iface->visual->depth_stencil_format;
304      sw = FALSE;
305      break;
306   case BUFFER_ACCUM:
307      format = stfb->iface->visual->accum_format;
308      sw = TRUE;
309      break;
310   default:
311      format = stfb->iface->visual->color_format;
312      if (stfb->Base.Visual.sRGBCapable)
313         format = util_format_srgb(format);
314      sw = FALSE;
315      break;
316   }
317
318   if (format == PIPE_FORMAT_NONE)
319      return FALSE;
320
321   rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
322   if (!rb)
323      return FALSE;
324
325   if (idx != BUFFER_DEPTH) {
326      _mesa_add_renderbuffer(&stfb->Base, idx, rb);
327   }
328   else {
329      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
330         _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
331      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
332         _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
333   }
334
335   return TRUE;
336}
337
338/**
339 * Intialize a struct gl_config from a visual.
340 */
341static void
342st_visual_to_context_mode(const struct st_visual *visual,
343                          struct gl_config *mode)
344{
345   memset(mode, 0, sizeof(*mode));
346
347   if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
348      mode->doubleBufferMode = GL_TRUE;
349   if (st_visual_have_buffers(visual,
350            ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
351      mode->stereoMode = GL_TRUE;
352
353   if (visual->color_format != PIPE_FORMAT_NONE) {
354      mode->rgbMode = GL_TRUE;
355
356      mode->redBits =
357         util_format_get_component_bits(visual->color_format,
358               UTIL_FORMAT_COLORSPACE_RGB, 0);
359      mode->greenBits =
360         util_format_get_component_bits(visual->color_format,
361               UTIL_FORMAT_COLORSPACE_RGB, 1);
362      mode->blueBits =
363         util_format_get_component_bits(visual->color_format,
364               UTIL_FORMAT_COLORSPACE_RGB, 2);
365      mode->alphaBits =
366         util_format_get_component_bits(visual->color_format,
367               UTIL_FORMAT_COLORSPACE_RGB, 3);
368
369      mode->rgbBits = mode->redBits +
370         mode->greenBits + mode->blueBits + mode->alphaBits;
371   }
372
373   if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
374      mode->depthBits =
375         util_format_get_component_bits(visual->depth_stencil_format,
376               UTIL_FORMAT_COLORSPACE_ZS, 0);
377      mode->stencilBits =
378         util_format_get_component_bits(visual->depth_stencil_format,
379               UTIL_FORMAT_COLORSPACE_ZS, 1);
380
381      mode->haveDepthBuffer = mode->depthBits > 0;
382      mode->haveStencilBuffer = mode->stencilBits > 0;
383   }
384
385   if (visual->accum_format != PIPE_FORMAT_NONE) {
386      mode->haveAccumBuffer = GL_TRUE;
387
388      mode->accumRedBits =
389         util_format_get_component_bits(visual->accum_format,
390               UTIL_FORMAT_COLORSPACE_RGB, 0);
391      mode->accumGreenBits =
392         util_format_get_component_bits(visual->accum_format,
393               UTIL_FORMAT_COLORSPACE_RGB, 1);
394      mode->accumBlueBits =
395         util_format_get_component_bits(visual->accum_format,
396               UTIL_FORMAT_COLORSPACE_RGB, 2);
397      mode->accumAlphaBits =
398         util_format_get_component_bits(visual->accum_format,
399               UTIL_FORMAT_COLORSPACE_RGB, 3);
400   }
401
402   if (visual->samples > 1) {
403      mode->sampleBuffers = 1;
404      mode->samples = visual->samples;
405   }
406}
407
408/**
409 * Create a framebuffer from a manager interface.
410 */
411static struct st_framebuffer *
412st_framebuffer_create(struct st_context *st,
413                      struct st_framebuffer_iface *stfbi)
414{
415   struct st_framebuffer *stfb;
416   struct gl_config mode;
417   gl_buffer_index idx;
418
419   if (!stfbi)
420      return NULL;
421
422   stfb = CALLOC_STRUCT(st_framebuffer);
423   if (!stfb)
424      return NULL;
425
426   st_visual_to_context_mode(stfbi->visual, &mode);
427
428   /*
429    * For desktop GL, sRGB framebuffer write is controlled by both the
430    * capability of the framebuffer and GL_FRAMEBUFFER_SRGB.  We should
431    * advertise the capability when the pipe driver (and core Mesa) supports
432    * it so that applications can enable sRGB write when they want to.
433    *
434    * This is not to be confused with GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB.  When
435    * the attribute is GLX_TRUE, it tells the st manager to pick a color
436    * format such that util_format_srgb(visual->color_format) can be supported
437    * by the pipe driver.  We still need to advertise the capability here.
438    *
439    * For GLES, however, sRGB framebuffer write is controlled only by the
440    * capability of the framebuffer.  There is GL_EXT_sRGB_write_control to
441    * give applications the control back, but sRGB write is still enabled by
442    * default.  To avoid unexpected results, we should not advertise the
443    * capability.  This could change when we add support for
444    * EGL_KHR_gl_colorspace.
445    */
446   if (_mesa_is_desktop_gl(st->ctx)) {
447      struct pipe_screen *screen = st->pipe->screen;
448      const enum pipe_format srgb_format =
449         util_format_srgb(stfbi->visual->color_format);
450
451      if (srgb_format != PIPE_FORMAT_NONE &&
452          st_pipe_format_to_mesa_format(srgb_format) != MESA_FORMAT_NONE &&
453          screen->is_format_supported(screen, srgb_format,
454                                      PIPE_TEXTURE_2D, stfbi->visual->samples,
455                                      PIPE_BIND_RENDER_TARGET))
456         mode.sRGBCapable = GL_TRUE;
457   }
458
459   _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
460
461   stfb->iface = stfbi;
462   stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
463
464   /* add the color buffer */
465   idx = stfb->Base._ColorDrawBufferIndexes[0];
466   if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
467      free(stfb);
468      return NULL;
469   }
470
471   st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
472   st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
473
474   stfb->stamp = 0;
475   st_framebuffer_update_attachments(stfb);
476
477   return stfb;
478}
479
480/**
481 * Reference a framebuffer.
482 */
483static void
484st_framebuffer_reference(struct st_framebuffer **ptr,
485                         struct st_framebuffer *stfb)
486{
487   struct gl_framebuffer *fb = &stfb->Base;
488   _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
489}
490
491static void
492st_context_flush(struct st_context_iface *stctxi, unsigned flags,
493                 struct pipe_fence_handle **fence)
494{
495   struct st_context *st = (struct st_context *) stctxi;
496   unsigned pipe_flags = 0;
497
498   if (flags & ST_FLUSH_END_OF_FRAME) {
499      pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
500   }
501
502   st_flush(st, fence, pipe_flags);
503   if (flags & ST_FLUSH_FRONT)
504      st_manager_flush_frontbuffer(st);
505}
506
507static boolean
508st_context_teximage(struct st_context_iface *stctxi,
509                    enum st_texture_type tex_type,
510                    int level, enum pipe_format pipe_format,
511                    struct pipe_resource *tex, boolean mipmap)
512{
513   struct st_context *st = (struct st_context *) stctxi;
514   struct gl_context *ctx = st->ctx;
515   struct gl_texture_object *texObj;
516   struct gl_texture_image *texImage;
517   struct st_texture_object *stObj;
518   struct st_texture_image *stImage;
519   GLenum internalFormat;
520   GLuint width, height, depth;
521   GLenum target;
522
523   switch (tex_type) {
524   case ST_TEXTURE_1D:
525      target = GL_TEXTURE_1D;
526      break;
527   case ST_TEXTURE_2D:
528      target = GL_TEXTURE_2D;
529      break;
530   case ST_TEXTURE_3D:
531      target = GL_TEXTURE_3D;
532      break;
533   case ST_TEXTURE_RECT:
534      target = GL_TEXTURE_RECTANGLE_ARB;
535      break;
536   default:
537      return FALSE;
538   }
539
540   texObj = _mesa_get_current_tex_object(ctx, target);
541
542   _mesa_lock_texture(ctx, texObj);
543
544   stObj = st_texture_object(texObj);
545   /* switch to surface based */
546   if (!stObj->surface_based) {
547      _mesa_clear_texture_object(ctx, texObj);
548      stObj->surface_based = GL_TRUE;
549   }
550
551   texImage = _mesa_get_tex_image(ctx, texObj, target, level);
552   stImage = st_texture_image(texImage);
553   if (tex) {
554      mesa_format texFormat = st_pipe_format_to_mesa_format(pipe_format);
555
556      if (util_format_has_alpha(tex->format))
557         internalFormat = GL_RGBA;
558      else
559         internalFormat = GL_RGB;
560
561      _mesa_init_teximage_fields(ctx, texImage,
562                                 tex->width0, tex->height0, 1, 0,
563                                 internalFormat, texFormat);
564
565      width = tex->width0;
566      height = tex->height0;
567      depth = tex->depth0;
568
569      /* grow the image size until we hit level = 0 */
570      while (level > 0) {
571         if (width != 1)
572            width <<= 1;
573         if (height != 1)
574            height <<= 1;
575         if (depth != 1)
576            depth <<= 1;
577         level--;
578      }
579   }
580   else {
581      _mesa_clear_texture_image(ctx, texImage);
582      width = height = depth = 0;
583   }
584
585   pipe_resource_reference(&stImage->pt, tex);
586   stObj->width0 = width;
587   stObj->height0 = height;
588   stObj->depth0 = depth;
589   stObj->surface_format = pipe_format;
590
591   _mesa_dirty_texobj(ctx, texObj);
592   _mesa_unlock_texture(ctx, texObj);
593
594   return TRUE;
595}
596
597static void
598st_context_copy(struct st_context_iface *stctxi,
599                struct st_context_iface *stsrci, unsigned mask)
600{
601   struct st_context *st = (struct st_context *) stctxi;
602   struct st_context *src = (struct st_context *) stsrci;
603
604   _mesa_copy_context(src->ctx, st->ctx, mask);
605}
606
607static boolean
608st_context_share(struct st_context_iface *stctxi,
609                 struct st_context_iface *stsrci)
610{
611   struct st_context *st = (struct st_context *) stctxi;
612   struct st_context *src = (struct st_context *) stsrci;
613
614   return _mesa_share_state(st->ctx, src->ctx);
615}
616
617static void
618st_context_destroy(struct st_context_iface *stctxi)
619{
620   struct st_context *st = (struct st_context *) stctxi;
621   st_destroy_context(st);
622}
623
624static struct st_context_iface *
625st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
626                      const struct st_context_attribs *attribs,
627                      enum st_context_error *error,
628                      struct st_context_iface *shared_stctxi)
629{
630   struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
631   struct st_context *st;
632   struct pipe_context *pipe;
633   struct gl_config mode;
634   gl_api api;
635
636   if (!(stapi->profile_mask & (1 << attribs->profile)))
637      return NULL;
638
639   switch (attribs->profile) {
640   case ST_PROFILE_DEFAULT:
641      api = API_OPENGL_COMPAT;
642      break;
643   case ST_PROFILE_OPENGL_ES1:
644      api = API_OPENGLES;
645      break;
646   case ST_PROFILE_OPENGL_ES2:
647      api = API_OPENGLES2;
648      break;
649   case ST_PROFILE_OPENGL_CORE:
650      api = API_OPENGL_CORE;
651      break;
652   default:
653      *error = ST_CONTEXT_ERROR_BAD_API;
654      return NULL;
655      break;
656   }
657
658   pipe = smapi->screen->context_create(smapi->screen, NULL);
659   if (!pipe) {
660      *error = ST_CONTEXT_ERROR_NO_MEMORY;
661      return NULL;
662   }
663
664   st_visual_to_context_mode(&attribs->visual, &mode);
665   st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
666   if (!st) {
667      *error = ST_CONTEXT_ERROR_NO_MEMORY;
668      pipe->destroy(pipe);
669      return NULL;
670   }
671
672   if (attribs->flags & ST_CONTEXT_FLAG_DEBUG){
673      if (!_mesa_set_debug_state_int(st->ctx, GL_DEBUG_OUTPUT, GL_TRUE)) {
674         *error = ST_CONTEXT_ERROR_NO_MEMORY;
675         return NULL;
676      }
677      st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
678   }
679
680   if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
681      st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
682
683   /* need to perform version check */
684   if (attribs->major > 1 || attribs->minor > 0) {
685      /* Is the actual version less than the requested version?
686       */
687      if (st->ctx->Version < attribs->major * 10 + attribs->minor) {
688	 *error = ST_CONTEXT_ERROR_BAD_VERSION;
689         st_destroy_context(st);
690         return NULL;
691      }
692   }
693
694   st->invalidate_on_gl_viewport =
695      smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
696
697   st->iface.destroy = st_context_destroy;
698   st->iface.flush = st_context_flush;
699   st->iface.teximage = st_context_teximage;
700   st->iface.copy = st_context_copy;
701   st->iface.share = st_context_share;
702   st->iface.st_context_private = (void *) smapi;
703   st->iface.cso_context = st->cso_context;
704   st->iface.pipe = st->pipe;
705
706   *error = ST_CONTEXT_SUCCESS;
707   return &st->iface;
708}
709
710static struct st_context_iface *
711st_api_get_current(struct st_api *stapi)
712{
713   GET_CURRENT_CONTEXT(ctx);
714   struct st_context *st = (ctx) ? ctx->st : NULL;
715
716   return (st) ? &st->iface : NULL;
717}
718
719static struct st_framebuffer *
720st_framebuffer_reuse_or_create(struct st_context *st,
721                               struct gl_framebuffer *fb,
722                               struct st_framebuffer_iface *stfbi)
723{
724   struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
725
726   /* dummy framebuffers cant be used as st_framebuffer */
727   if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
728       cur->iface == stfbi) {
729      /* reuse the current stfb */
730      st_framebuffer_reference(&stfb, cur);
731   }
732   else {
733      /* create a new one */
734      stfb = st_framebuffer_create(st, stfbi);
735   }
736
737   return stfb;
738}
739
740static boolean
741st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
742                    struct st_framebuffer_iface *stdrawi,
743                    struct st_framebuffer_iface *streadi)
744{
745   struct st_context *st = (struct st_context *) stctxi;
746   struct st_framebuffer *stdraw, *stread;
747   boolean ret;
748
749   _glapi_check_multithread();
750
751   if (st) {
752      /* reuse or create the draw fb */
753      stdraw = st_framebuffer_reuse_or_create(st,
754            st->ctx->WinSysDrawBuffer, stdrawi);
755      if (streadi != stdrawi) {
756         /* do the same for the read fb */
757         stread = st_framebuffer_reuse_or_create(st,
758               st->ctx->WinSysReadBuffer, streadi);
759      }
760      else {
761         stread = NULL;
762         /* reuse the draw fb for the read fb */
763         if (stdraw)
764            st_framebuffer_reference(&stread, stdraw);
765      }
766
767      if (stdraw && stread) {
768         st_framebuffer_validate(stdraw, st);
769         if (stread != stdraw)
770            st_framebuffer_validate(stread, st);
771
772         ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
773
774         st->draw_stamp = stdraw->stamp - 1;
775         st->read_stamp = stread->stamp - 1;
776         st_context_validate(st, stdraw, stread);
777      }
778      else {
779         struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
780         ret = _mesa_make_current(st->ctx, incomplete, incomplete);
781      }
782
783      st_framebuffer_reference(&stdraw, NULL);
784      st_framebuffer_reference(&stread, NULL);
785   }
786   else {
787      ret = _mesa_make_current(NULL, NULL, NULL);
788   }
789
790   return ret;
791}
792
793static st_proc_t
794st_api_get_proc_address(struct st_api *stapi, const char *procname)
795{
796   return (st_proc_t) _glapi_get_proc_address(procname);
797}
798
799static void
800st_api_destroy(struct st_api *stapi)
801{
802}
803
804/**
805 * Flush the front buffer if the current context renders to the front buffer.
806 */
807void
808st_manager_flush_frontbuffer(struct st_context *st)
809{
810   struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
811   struct st_renderbuffer *strb = NULL;
812
813   if (stfb)
814      strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
815   if (!strb)
816      return;
817
818   /* never a dummy fb */
819   assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
820   stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
821}
822
823/**
824 * Return the surface of an EGLImage.
825 * FIXME: I think this should operate on resources, not surfaces
826 */
827struct pipe_surface *
828st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
829{
830   struct st_manager *smapi =
831      (struct st_manager *) st->iface.st_context_private;
832   struct st_egl_image stimg;
833   struct pipe_surface *ps, surf_tmpl;
834
835   if (!smapi || !smapi->get_egl_image)
836      return NULL;
837
838   memset(&stimg, 0, sizeof(stimg));
839   if (!smapi->get_egl_image(smapi, eglimg, &stimg))
840      return NULL;
841
842   u_surface_default_template(&surf_tmpl, stimg.texture);
843   surf_tmpl.u.tex.level = stimg.level;
844   surf_tmpl.u.tex.first_layer = stimg.layer;
845   surf_tmpl.u.tex.last_layer = stimg.layer;
846   ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
847   pipe_resource_reference(&stimg.texture, NULL);
848
849   return ps;
850}
851
852/**
853 * Re-validate the framebuffers.
854 */
855void
856st_manager_validate_framebuffers(struct st_context *st)
857{
858   struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
859   struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
860
861   if (stdraw)
862      st_framebuffer_validate(stdraw, st);
863   if (stread && stread != stdraw)
864      st_framebuffer_validate(stread, st);
865
866   st_context_validate(st, stdraw, stread);
867}
868
869/**
870 * Add a color renderbuffer on demand.
871 */
872boolean
873st_manager_add_color_renderbuffer(struct st_context *st,
874                                  struct gl_framebuffer *fb,
875                                  gl_buffer_index idx)
876{
877   struct st_framebuffer *stfb = st_ws_framebuffer(fb);
878
879   /* FBO */
880   if (!stfb)
881      return FALSE;
882
883   if (stfb->Base.Attachment[idx].Renderbuffer)
884      return TRUE;
885
886   switch (idx) {
887   case BUFFER_FRONT_LEFT:
888   case BUFFER_BACK_LEFT:
889   case BUFFER_FRONT_RIGHT:
890   case BUFFER_BACK_RIGHT:
891      break;
892   default:
893      return FALSE;
894      break;
895   }
896
897   if (!st_framebuffer_add_renderbuffer(stfb, idx))
898      return FALSE;
899
900   st_framebuffer_update_attachments(stfb);
901
902   /*
903    * Force a call to the state tracker manager to validate the
904    * new renderbuffer. It might be that there is a window system
905    * renderbuffer available.
906    */
907   if(stfb->iface)
908      stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
909
910   st_invalidate_state(st->ctx, _NEW_BUFFERS);
911
912   return TRUE;
913}
914
915static unsigned get_version(struct pipe_screen *screen,
916                            struct st_config_options *options, gl_api api)
917{
918   struct gl_constants consts = {0};
919   struct gl_extensions extensions = {0};
920   GLuint version;
921
922   if ((api == API_OPENGL_COMPAT || api == API_OPENGL_CORE) &&
923       _mesa_override_gl_version_contextless(&consts, &api, &version)) {
924      return version;
925   }
926
927   _mesa_init_constants(&consts, api);
928   _mesa_init_extensions(&extensions);
929
930   st_init_limits(screen, &consts, &extensions);
931   st_init_extensions(screen, api, &consts, &extensions, options, GL_TRUE);
932
933   return _mesa_get_version(&extensions, &consts, api);
934}
935
936static void
937st_api_query_versions(struct st_api *stapi, struct st_manager *sm,
938                      struct st_config_options *options,
939                      int *gl_core_version,
940                      int *gl_compat_version,
941                      int *gl_es1_version,
942                      int *gl_es2_version)
943{
944   *gl_core_version = get_version(sm->screen, options, API_OPENGL_CORE);
945   *gl_compat_version = get_version(sm->screen, options, API_OPENGL_COMPAT);
946   *gl_es1_version = get_version(sm->screen, options, API_OPENGLES);
947   *gl_es2_version = get_version(sm->screen, options, API_OPENGLES2);
948}
949
950static const struct st_api st_gl_api = {
951   "Mesa " PACKAGE_VERSION,
952   ST_API_OPENGL,
953   ST_PROFILE_DEFAULT_MASK |
954   ST_PROFILE_OPENGL_CORE_MASK |
955   ST_PROFILE_OPENGL_ES1_MASK |
956   ST_PROFILE_OPENGL_ES2_MASK |
957   0,
958   ST_API_FEATURE_MS_VISUALS_MASK,
959   st_api_destroy,
960   st_api_query_versions,
961   st_api_get_proc_address,
962   st_api_create_context,
963   st_api_make_current,
964   st_api_get_current,
965};
966
967struct st_api *
968st_gl_api_create(void)
969{
970   return (struct st_api *) &st_gl_api;
971}
972