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1 /**************************************************************************
2  *
3  * Copyright 2003 VMware, Inc.
4  * All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 
28 
29 #include "main/glheader.h"
30 #include "main/context.h"
31 #include "main/extensions.h"
32 #include "main/fbobject.h"
33 #include "main/framebuffer.h"
34 #include "main/imports.h"
35 #include "main/points.h"
36 #include "main/renderbuffer.h"
37 
38 #include "swrast/swrast.h"
39 #include "swrast_setup/swrast_setup.h"
40 #include "tnl/tnl.h"
41 #include "drivers/common/driverfuncs.h"
42 #include "drivers/common/meta.h"
43 
44 #include "intel_chipset.h"
45 #include "intel_buffers.h"
46 #include "intel_tex.h"
47 #include "intel_batchbuffer.h"
48 #include "intel_clear.h"
49 #include "intel_extensions.h"
50 #include "intel_pixel.h"
51 #include "intel_regions.h"
52 #include "intel_buffer_objects.h"
53 #include "intel_fbo.h"
54 #include "intel_bufmgr.h"
55 #include "intel_screen.h"
56 #include "intel_mipmap_tree.h"
57 
58 #include "utils.h"
59 #include "util/debug.h"
60 #include "util/ralloc.h"
61 
62 int INTEL_DEBUG = (0);
63 
64 const char *const i915_vendor_string = "Intel Open Source Technology Center";
65 
66 const char *
i915_get_renderer_string(unsigned deviceID)67 i915_get_renderer_string(unsigned deviceID)
68 {
69    const char *chipset;
70    static char buffer[128];
71 
72    switch (deviceID) {
73 #undef CHIPSET
74 #define CHIPSET(id, symbol, str) case id: chipset = str; break;
75 #include "pci_ids/i915_pci_ids.h"
76    default:
77       chipset = "Unknown Intel Chipset";
78       break;
79    }
80 
81    (void) driGetRendererString(buffer, chipset, 0);
82    return buffer;
83 }
84 
85 static const GLubyte *
intelGetString(struct gl_context * ctx,GLenum name)86 intelGetString(struct gl_context * ctx, GLenum name)
87 {
88    const struct intel_context *const intel = intel_context(ctx);
89 
90    switch (name) {
91    case GL_VENDOR:
92       return (GLubyte *) i915_vendor_string;
93 
94    case GL_RENDERER:
95       return
96          (GLubyte *) i915_get_renderer_string(intel->intelScreen->deviceID);
97 
98    default:
99       return NULL;
100    }
101 }
102 
103 #define flushFront(screen)      ((screen)->image.loader ? (screen)->image.loader->flushFrontBuffer : (screen)->dri2.loader->flushFrontBuffer)
104 
105 static void
intel_flush_front(struct gl_context * ctx)106 intel_flush_front(struct gl_context *ctx)
107 {
108    struct intel_context *intel = intel_context(ctx);
109     __DRIcontext *driContext = intel->driContext;
110     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
111     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
112 
113     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
114       if (flushFront(screen) &&
115           driDrawable &&
116           driDrawable->loaderPrivate) {
117          flushFront(screen)(driDrawable, driDrawable->loaderPrivate);
118 
119 	 /* We set the dirty bit in intel_prepare_render() if we're
120 	  * front buffer rendering once we get there.
121 	  */
122 	 intel->front_buffer_dirty = false;
123       }
124    }
125 }
126 
127 static void
128 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable);
129 
130 static unsigned
intel_bits_per_pixel(const struct intel_renderbuffer * rb)131 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
132 {
133    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
134 }
135 
136 static void
137 intel_query_dri2_buffers(struct intel_context *intel,
138 			 __DRIdrawable *drawable,
139 			 __DRIbuffer **buffers,
140 			 int *count);
141 
142 static void
143 intel_process_dri2_buffer(struct intel_context *intel,
144 			  __DRIdrawable *drawable,
145 			  __DRIbuffer *buffer,
146 			  struct intel_renderbuffer *rb,
147 			  const char *buffer_name);
148 
149 static void
intel_update_dri2_buffers(struct intel_context * intel,__DRIdrawable * drawable)150 intel_update_dri2_buffers(struct intel_context *intel, __DRIdrawable *drawable)
151 {
152    __DRIbuffer *buffers = NULL;
153    int i, count;
154    const char *region_name;
155    struct intel_renderbuffer *rb;
156    struct gl_framebuffer *fb = drawable->driverPrivate;
157 
158    intel_query_dri2_buffers(intel, drawable, &buffers, &count);
159 
160    if (buffers == NULL)
161       return;
162 
163    for (i = 0; i < count; i++) {
164       switch (buffers[i].attachment) {
165       case __DRI_BUFFER_FRONT_LEFT:
166          rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
167          region_name = "dri2 front buffer";
168          break;
169 
170       case __DRI_BUFFER_FAKE_FRONT_LEFT:
171          rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
172          region_name = "dri2 fake front buffer";
173          break;
174 
175       case __DRI_BUFFER_BACK_LEFT:
176          rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
177          region_name = "dri2 back buffer";
178          break;
179 
180       case __DRI_BUFFER_DEPTH:
181       case __DRI_BUFFER_HIZ:
182       case __DRI_BUFFER_DEPTH_STENCIL:
183       case __DRI_BUFFER_STENCIL:
184       case __DRI_BUFFER_ACCUM:
185       default:
186          fprintf(stderr,
187                  "unhandled buffer attach event, attachment type %d\n",
188                  buffers[i].attachment);
189          return;
190       }
191 
192       intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
193    }
194 }
195 
196 void
intel_update_renderbuffers(__DRIcontext * context,__DRIdrawable * drawable)197 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
198 {
199    struct intel_context *intel = context->driverPrivate;
200    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
201 
202    /* Set this up front, so that in case our buffers get invalidated
203     * while we're getting new buffers, we don't clobber the stamp and
204     * thus ignore the invalidate. */
205    drawable->lastStamp = drawable->dri2.stamp;
206 
207    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
208       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
209 
210    if (screen->image.loader)
211       intel_update_image_buffers(intel, drawable);
212    else
213       intel_update_dri2_buffers(intel, drawable);
214 
215    driUpdateFramebufferSize(&intel->ctx, drawable);
216 }
217 
218 /**
219  * intel_prepare_render should be called anywhere that curent read/drawbuffer
220  * state is required.
221  */
222 void
intel_prepare_render(struct intel_context * intel)223 intel_prepare_render(struct intel_context *intel)
224 {
225    __DRIcontext *driContext = intel->driContext;
226    __DRIdrawable *drawable;
227 
228    drawable = driContext->driDrawablePriv;
229    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
230       if (drawable->lastStamp != drawable->dri2.stamp)
231 	 intel_update_renderbuffers(driContext, drawable);
232       intel_draw_buffer(&intel->ctx);
233       driContext->dri2.draw_stamp = drawable->dri2.stamp;
234    }
235 
236    drawable = driContext->driReadablePriv;
237    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
238       if (drawable->lastStamp != drawable->dri2.stamp)
239 	 intel_update_renderbuffers(driContext, drawable);
240       driContext->dri2.read_stamp = drawable->dri2.stamp;
241    }
242 
243    /* If we're currently rendering to the front buffer, the rendering
244     * that will happen next will probably dirty the front buffer.  So
245     * mark it as dirty here.
246     */
247    if (_mesa_is_front_buffer_drawing(intel->ctx.DrawBuffer))
248       intel->front_buffer_dirty = true;
249 
250    /* Wait for the swapbuffers before the one we just emitted, so we
251     * don't get too many swaps outstanding for apps that are GPU-heavy
252     * but not CPU-heavy.
253     *
254     * We're using intelDRI2Flush (called from the loader before
255     * swapbuffer) and glFlush (for front buffer rendering) as the
256     * indicator that a frame is done and then throttle when we get
257     * here as we prepare to render the next frame.  At this point for
258     * round trips for swap/copy and getting new buffers are done and
259     * we'll spend less time waiting on the GPU.
260     *
261     * Unfortunately, we don't have a handle to the batch containing
262     * the swap, and getting our hands on that doesn't seem worth it,
263     * so we just us the first batch we emitted after the last swap.
264     */
265    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
266       if (!intel->disable_throttling)
267          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
268       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
269       intel->first_post_swapbuffers_batch = NULL;
270       intel->need_throttle = false;
271    }
272 }
273 
274 static void
intel_noninvalidate_viewport(struct gl_context * ctx)275 intel_noninvalidate_viewport(struct gl_context *ctx)
276 {
277     struct intel_context *intel = intel_context(ctx);
278     __DRIcontext *driContext = intel->driContext;
279 
280     intelCalcViewport(ctx);
281 
282     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
283        dri2InvalidateDrawable(driContext->driDrawablePriv);
284        dri2InvalidateDrawable(driContext->driReadablePriv);
285     }
286 }
287 
288 static void
intel_viewport(struct gl_context * ctx)289 intel_viewport(struct gl_context *ctx)
290 {
291     intelCalcViewport(ctx);
292 }
293 
294 static const struct debug_control debug_control[] = {
295    { "tex",   DEBUG_TEXTURE},
296    { "state", DEBUG_STATE},
297    { "blit",  DEBUG_BLIT},
298    { "mip",   DEBUG_MIPTREE},
299    { "fall",  DEBUG_PERF},
300    { "perf",  DEBUG_PERF},
301    { "bat",   DEBUG_BATCH},
302    { "pix",   DEBUG_PIXEL},
303    { "buf",   DEBUG_BUFMGR},
304    { "reg",   DEBUG_REGION},
305    { "fbo",   DEBUG_FBO},
306    { "fs",    DEBUG_WM },
307    { "sync",  DEBUG_SYNC},
308    { "dri",   DEBUG_DRI },
309    { "stats", DEBUG_STATS },
310    { "wm",    DEBUG_WM },
311    { "aub",   DEBUG_AUB },
312    { NULL,    0 }
313 };
314 
315 
316 static void
intelInvalidateState(struct gl_context * ctx)317 intelInvalidateState(struct gl_context * ctx)
318 {
319    GLuint new_state = ctx->NewState;
320     struct intel_context *intel = intel_context(ctx);
321 
322     if (ctx->swrast_context)
323        _swrast_InvalidateState(ctx, new_state);
324 
325    intel->NewGLState |= new_state;
326 
327    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
328       _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
329 
330    if (intel->vtbl.invalidate_state)
331       intel->vtbl.invalidate_state( intel, new_state );
332 }
333 
334 void
intel_flush_rendering_to_batch(struct gl_context * ctx)335 intel_flush_rendering_to_batch(struct gl_context *ctx)
336 {
337    struct intel_context *intel = intel_context(ctx);
338 
339    if (intel->Fallback)
340       _swrast_flush(ctx);
341 
342    INTEL_FIREVERTICES(intel);
343 }
344 
345 void
_intel_flush(struct gl_context * ctx,const char * file,int line)346 _intel_flush(struct gl_context *ctx, const char *file, int line)
347 {
348    struct intel_context *intel = intel_context(ctx);
349 
350    intel_flush_rendering_to_batch(ctx);
351 
352    if (intel->batch.used)
353       _intel_batchbuffer_flush(intel, file, line);
354 }
355 
356 static void
intel_glFlush(struct gl_context * ctx)357 intel_glFlush(struct gl_context *ctx)
358 {
359    struct intel_context *intel = intel_context(ctx);
360 
361    intel_flush(ctx);
362    intel_flush_front(ctx);
363    if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer))
364       intel->need_throttle = true;
365 }
366 
367 void
intelFinish(struct gl_context * ctx)368 intelFinish(struct gl_context * ctx)
369 {
370    struct intel_context *intel = intel_context(ctx);
371 
372    intel_flush(ctx);
373    intel_flush_front(ctx);
374 
375    if (intel->batch.last_bo)
376       drm_intel_bo_wait_rendering(intel->batch.last_bo);
377 }
378 
379 void
intelInitDriverFunctions(struct dd_function_table * functions)380 intelInitDriverFunctions(struct dd_function_table *functions)
381 {
382    _mesa_init_driver_functions(functions);
383 
384    functions->Flush = intel_glFlush;
385    functions->Finish = intelFinish;
386    functions->GetString = intelGetString;
387    functions->UpdateState = intelInvalidateState;
388 
389    intelInitTextureFuncs(functions);
390    intelInitTextureImageFuncs(functions);
391    intelInitTextureSubImageFuncs(functions);
392    intelInitTextureCopyImageFuncs(functions);
393    intelInitClearFuncs(functions);
394    intelInitBufferFuncs(functions);
395    intelInitPixelFuncs(functions);
396    intelInitBufferObjectFuncs(functions);
397    intel_init_syncobj_functions(functions);
398 }
399 
400 bool
intelInitContext(struct intel_context * intel,int api,unsigned major_version,unsigned minor_version,uint32_t flags,const struct gl_config * mesaVis,__DRIcontext * driContextPriv,void * sharedContextPrivate,struct dd_function_table * functions,unsigned * dri_ctx_error)401 intelInitContext(struct intel_context *intel,
402                  int api,
403                  unsigned major_version,
404                  unsigned minor_version,
405                  uint32_t flags,
406                  const struct gl_config * mesaVis,
407                  __DRIcontext * driContextPriv,
408                  void *sharedContextPrivate,
409                  struct dd_function_table *functions,
410                  unsigned *dri_ctx_error)
411 {
412    struct gl_context *ctx = &intel->ctx;
413    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
414    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
415    struct intel_screen *intelScreen = sPriv->driverPrivate;
416    int bo_reuse_mode;
417 
418    /* Can't rely on invalidate events, fall back to glViewport hack */
419    if (!driContextPriv->driScreenPriv->dri2.useInvalidate)
420       functions->Viewport = intel_noninvalidate_viewport;
421    else
422       functions->Viewport = intel_viewport;
423 
424    intel->intelScreen = intelScreen;
425 
426    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
427                                  functions)) {
428       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
429       printf("%s: failed to init mesa context\n", __func__);
430       return false;
431    }
432 
433    driContextSetFlags(&intel->ctx, flags);
434 
435    driContextPriv->driverPrivate = intel;
436    intel->driContext = driContextPriv;
437 
438    intel->gen = intelScreen->gen;
439 
440    const int devID = intelScreen->deviceID;
441 
442    intel->is_945 = IS_945(devID);
443 
444    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
445 
446    memset(&ctx->TextureFormatSupported,
447 	  0, sizeof(ctx->TextureFormatSupported));
448 
449    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
450                        sPriv->myNum, "i915");
451    intel->maxBatchSize = 4096;
452 
453    /* Estimate the size of the mappable aperture into the GTT.  There's an
454     * ioctl to get the whole GTT size, but not one to get the mappable subset.
455     * It turns out it's basically always 256MB, though some ancient hardware
456     * was smaller.
457     */
458    uint32_t gtt_size = 256 * 1024 * 1024;
459    if (intel->gen == 2)
460       gtt_size = 128 * 1024 * 1024;
461 
462    /* We don't want to map two objects such that a memcpy between them would
463     * just fault one mapping in and then the other over and over forever.  So
464     * we would need to divide the GTT size by 2.  Additionally, some GTT is
465     * taken up by things like the framebuffer and the ringbuffer and such, so
466     * be more conservative.
467     */
468    intel->max_gtt_map_object_size = gtt_size / 4;
469 
470    intel->bufmgr = intelScreen->bufmgr;
471 
472    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
473    switch (bo_reuse_mode) {
474    case DRI_CONF_BO_REUSE_DISABLED:
475       break;
476    case DRI_CONF_BO_REUSE_ALL:
477       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
478       break;
479    }
480 
481    ctx->Const.MinLineWidth = 1.0;
482    ctx->Const.MinLineWidthAA = 1.0;
483    ctx->Const.MaxLineWidth = 7.0;
484    ctx->Const.MaxLineWidthAA = 7.0;
485    ctx->Const.LineWidthGranularity = 0.5;
486 
487    ctx->Const.MinPointSize = 1.0;
488    ctx->Const.MinPointSizeAA = 1.0;
489    ctx->Const.MaxPointSize = 255.0;
490    ctx->Const.MaxPointSizeAA = 3.0;
491    ctx->Const.PointSizeGranularity = 1.0;
492 
493    ctx->Const.StripTextureBorder = GL_TRUE;
494 
495    /* reinitialize the context point state.
496     * It depend on constants in __struct gl_contextRec::Const
497     */
498    _mesa_init_point(ctx);
499 
500    ctx->Const.MaxRenderbufferSize = 2048;
501 
502    _swrast_CreateContext(ctx);
503    _vbo_CreateContext(ctx);
504    if (ctx->swrast_context) {
505       _tnl_CreateContext(ctx);
506       _swsetup_CreateContext(ctx);
507 
508       /* Configure swrast to match hardware characteristics: */
509       _swrast_allow_pixel_fog(ctx, false);
510       _swrast_allow_vertex_fog(ctx, true);
511    }
512 
513    _mesa_meta_init(ctx);
514 
515    intel->hw_stipple = 1;
516 
517    intel->RenderIndex = ~0;
518 
519    intelInitExtensions(ctx);
520 
521    INTEL_DEBUG = parse_debug_string(getenv("INTEL_DEBUG"), debug_control);
522    if (INTEL_DEBUG & DEBUG_BUFMGR)
523       dri_bufmgr_set_debug(intel->bufmgr, true);
524    if (INTEL_DEBUG & DEBUG_PERF)
525       intel->perf_debug = true;
526 
527    if (INTEL_DEBUG & DEBUG_AUB)
528       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
529 
530    intel_batchbuffer_init(intel);
531 
532    intel_fbo_init(intel);
533 
534    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
535 
536    intel->prim.primitive = ~0;
537 
538    /* Force all software fallbacks */
539    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
540       fprintf(stderr, "disabling 3D rasterization\n");
541       intel->no_rast = 1;
542    }
543 
544    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
545       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
546       intel->always_flush_batch = 1;
547    }
548 
549    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
550       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
551       intel->always_flush_cache = 1;
552    }
553 
554    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
555       fprintf(stderr, "disabling flush throttling\n");
556       intel->disable_throttling = 1;
557    }
558 
559    return true;
560 }
561 
562 void
intelDestroyContext(__DRIcontext * driContextPriv)563 intelDestroyContext(__DRIcontext * driContextPriv)
564 {
565    struct intel_context *intel =
566       (struct intel_context *) driContextPriv->driverPrivate;
567    struct gl_context *ctx = &intel->ctx;
568 
569    assert(intel);               /* should never be null */
570    if (intel) {
571       INTEL_FIREVERTICES(intel);
572 
573       /* Dump a final BMP in case the application doesn't call SwapBuffers */
574       if (INTEL_DEBUG & DEBUG_AUB) {
575          intel_batchbuffer_flush(intel);
576 	 aub_dump_bmp(&intel->ctx);
577       }
578 
579       _mesa_meta_free(&intel->ctx);
580 
581       intel->vtbl.destroy(intel);
582 
583       if (ctx->swrast_context) {
584          _swsetup_DestroyContext(&intel->ctx);
585          _tnl_DestroyContext(&intel->ctx);
586       }
587       _vbo_DestroyContext(&intel->ctx);
588 
589       if (ctx->swrast_context)
590          _swrast_DestroyContext(&intel->ctx);
591       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
592 
593       intel_batchbuffer_free(intel);
594 
595       free(intel->prim.vb);
596       intel->prim.vb = NULL;
597       drm_intel_bo_unreference(intel->prim.vb_bo);
598       intel->prim.vb_bo = NULL;
599       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
600       intel->first_post_swapbuffers_batch = NULL;
601 
602       driDestroyOptionCache(&intel->optionCache);
603 
604       /* free the Mesa context */
605       _mesa_free_context_data(&intel->ctx);
606 
607       _math_matrix_dtr(&intel->ViewportMatrix);
608 
609       ralloc_free(intel);
610       driContextPriv->driverPrivate = NULL;
611    }
612 }
613 
614 GLboolean
intelUnbindContext(__DRIcontext * driContextPriv)615 intelUnbindContext(__DRIcontext * driContextPriv)
616 {
617    /* Unset current context and dispath table */
618    _mesa_make_current(NULL, NULL, NULL);
619 
620    return true;
621 }
622 
623 GLboolean
intelMakeCurrent(__DRIcontext * driContextPriv,__DRIdrawable * driDrawPriv,__DRIdrawable * driReadPriv)624 intelMakeCurrent(__DRIcontext * driContextPriv,
625                  __DRIdrawable * driDrawPriv,
626                  __DRIdrawable * driReadPriv)
627 {
628    struct intel_context *intel;
629 
630    if (driContextPriv)
631       intel = (struct intel_context *) driContextPriv->driverPrivate;
632    else
633       intel = NULL;
634 
635    if (driContextPriv) {
636       struct gl_context *ctx = &intel->ctx;
637       struct gl_framebuffer *fb, *readFb;
638 
639       if (driDrawPriv == NULL && driReadPriv == NULL) {
640 	 fb = _mesa_get_incomplete_framebuffer();
641 	 readFb = _mesa_get_incomplete_framebuffer();
642       } else {
643 	 fb = driDrawPriv->driverPrivate;
644 	 readFb = driReadPriv->driverPrivate;
645 	 driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
646 	 driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
647       }
648 
649       intel_prepare_render(intel);
650       _mesa_make_current(ctx, fb, readFb);
651 
652       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
653        * is NULL at that point.  We can't call _mesa_makecurrent()
654        * first, since we need the buffer size for the initial
655        * viewport.  So just call intel_draw_buffer() again here. */
656       intel_draw_buffer(ctx);
657    }
658    else {
659       _mesa_make_current(NULL, NULL, NULL);
660    }
661 
662    return true;
663 }
664 
665 /**
666  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
667  *
668  * To determine which DRI buffers to request, examine the renderbuffers
669  * attached to the drawable's framebuffer. Then request the buffers with
670  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
671  *
672  * This is called from intel_update_renderbuffers().
673  *
674  * \param drawable      Drawable whose buffers are queried.
675  * \param buffers       [out] List of buffers returned by DRI2 query.
676  * \param buffer_count  [out] Number of buffers returned.
677  *
678  * \see intel_update_renderbuffers()
679  * \see DRI2GetBuffers()
680  * \see DRI2GetBuffersWithFormat()
681  */
682 static void
intel_query_dri2_buffers(struct intel_context * intel,__DRIdrawable * drawable,__DRIbuffer ** buffers,int * buffer_count)683 intel_query_dri2_buffers(struct intel_context *intel,
684 			 __DRIdrawable *drawable,
685 			 __DRIbuffer **buffers,
686 			 int *buffer_count)
687 {
688    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
689    struct gl_framebuffer *fb = drawable->driverPrivate;
690    int i = 0;
691    unsigned attachments[8];
692 
693    struct intel_renderbuffer *front_rb;
694    struct intel_renderbuffer *back_rb;
695 
696    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
697    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
698 
699    memset(attachments, 0, sizeof(attachments));
700    if ((_mesa_is_front_buffer_drawing(fb) ||
701         _mesa_is_front_buffer_reading(fb) ||
702 	!back_rb) && front_rb) {
703       /* If a fake front buffer is in use, then querying for
704        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
705        * the real front buffer to the fake front buffer.  So before doing the
706        * query, we need to make sure all the pending drawing has landed in the
707        * real front buffer.
708        */
709       intel_flush(&intel->ctx);
710       intel_flush_front(&intel->ctx);
711 
712       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
713       attachments[i++] = intel_bits_per_pixel(front_rb);
714    } else if (front_rb && intel->front_buffer_dirty) {
715       /* We have pending front buffer rendering, but we aren't querying for a
716        * front buffer.  If the front buffer we have is a fake front buffer,
717        * the X server is going to throw it away when it processes the query.
718        * So before doing the query, make sure all the pending drawing has
719        * landed in the real front buffer.
720        */
721       intel_flush(&intel->ctx);
722       intel_flush_front(&intel->ctx);
723    }
724 
725    if (back_rb) {
726       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
727       attachments[i++] = intel_bits_per_pixel(back_rb);
728    }
729 
730    assert(i <= ARRAY_SIZE(attachments));
731 
732    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
733 							&drawable->w,
734 							&drawable->h,
735 							attachments, i / 2,
736 							buffer_count,
737 							drawable->loaderPrivate);
738 }
739 
740 /**
741  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
742  *
743  * This is called from intel_update_renderbuffers().
744  *
745  * \par Note:
746  *    DRI buffers whose attachment point is DRI2BufferStencil or
747  *    DRI2BufferDepthStencil are handled as special cases.
748  *
749  * \param buffer_name is a human readable name, such as "dri2 front buffer",
750  *        that is passed to intel_region_alloc_for_handle().
751  *
752  * \see intel_update_renderbuffers()
753  * \see intel_region_alloc_for_handle()
754  */
755 static void
intel_process_dri2_buffer(struct intel_context * intel,__DRIdrawable * drawable,__DRIbuffer * buffer,struct intel_renderbuffer * rb,const char * buffer_name)756 intel_process_dri2_buffer(struct intel_context *intel,
757 			  __DRIdrawable *drawable,
758 			  __DRIbuffer *buffer,
759 			  struct intel_renderbuffer *rb,
760 			  const char *buffer_name)
761 {
762    struct intel_region *region = NULL;
763 
764    if (!rb)
765       return;
766 
767    /* We try to avoid closing and reopening the same BO name, because the first
768     * use of a mapping of the buffer involves a bunch of page faulting which is
769     * moderately expensive.
770     */
771    if (rb->mt &&
772        rb->mt->region &&
773        rb->mt->region->name == buffer->name)
774       return;
775 
776    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
777       fprintf(stderr,
778 	      "attaching buffer %d, at %d, cpp %d, pitch %d\n",
779 	      buffer->name, buffer->attachment,
780 	      buffer->cpp, buffer->pitch);
781    }
782 
783    intel_miptree_release(&rb->mt);
784    region = intel_region_alloc_for_handle(intel->intelScreen,
785                                           buffer->cpp,
786                                           drawable->w,
787                                           drawable->h,
788                                           buffer->pitch,
789                                           buffer->name,
790                                           buffer_name);
791    if (!region)
792       return;
793 
794    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
795                                                  buffer->attachment,
796                                                  intel_rb_format(rb),
797                                                  region);
798    intel_region_release(&region);
799 }
800 
801 /**
802  * \brief Query DRI Image loader to obtain a DRIdrawable's buffers.
803  *
804  * To determine which DRI buffers to request, examine the renderbuffers
805  * attached to the drawable's framebuffer. Then request the buffers with
806  * dri3
807  *
808  * This is called from intel_update_renderbuffers().
809  *
810  * \param drawable      Drawable whose buffers are queried.
811  * \param buffers       [out] List of buffers returned by DRI2 query.
812  * \param buffer_count  [out] Number of buffers returned.
813  *
814  * \see intel_update_renderbuffers()
815  */
816 
817 static void
intel_update_image_buffer(struct intel_context * intel,__DRIdrawable * drawable,struct intel_renderbuffer * rb,__DRIimage * buffer,enum __DRIimageBufferMask buffer_type)818 intel_update_image_buffer(struct intel_context *intel,
819                           __DRIdrawable *drawable,
820                           struct intel_renderbuffer *rb,
821                           __DRIimage *buffer,
822                           enum __DRIimageBufferMask buffer_type)
823 {
824    struct intel_region *region = buffer->region;
825 
826    if (!rb || !region)
827       return;
828 
829    unsigned num_samples = rb->Base.Base.NumSamples;
830 
831    if (rb->mt &&
832        rb->mt->region &&
833        rb->mt->region == region)
834       return;
835 
836    intel_miptree_release(&rb->mt);
837    rb->mt = intel_miptree_create_for_image_buffer(intel,
838                                                   buffer_type,
839                                                   intel_rb_format(rb),
840                                                   num_samples,
841                                                   region);
842 }
843 
844 
845 static void
intel_update_image_buffers(struct intel_context * intel,__DRIdrawable * drawable)846 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable)
847 {
848    struct gl_framebuffer *fb = drawable->driverPrivate;
849    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
850    struct intel_renderbuffer *front_rb;
851    struct intel_renderbuffer *back_rb;
852    struct __DRIimageList images;
853    unsigned int format;
854    uint32_t buffer_mask = 0;
855    int ret;
856 
857    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
858    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
859 
860    if (back_rb)
861       format = intel_rb_format(back_rb);
862    else if (front_rb)
863       format = intel_rb_format(front_rb);
864    else
865       return;
866 
867    if (front_rb && (_mesa_is_front_buffer_drawing(fb) ||
868                     _mesa_is_front_buffer_reading(fb) || !back_rb)) {
869       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
870    }
871 
872    if (back_rb)
873       buffer_mask |= __DRI_IMAGE_BUFFER_BACK;
874 
875    ret = screen->image.loader->getBuffers(drawable,
876                                           driGLFormatToImageFormat(format),
877                                           &drawable->dri2.stamp,
878                                           drawable->loaderPrivate,
879                                           buffer_mask,
880                                           &images);
881    if (!ret)
882       return;
883 
884    if (images.image_mask & __DRI_IMAGE_BUFFER_FRONT) {
885       drawable->w = images.front->width;
886       drawable->h = images.front->height;
887       intel_update_image_buffer(intel,
888                                 drawable,
889                                 front_rb,
890                                 images.front,
891                                 __DRI_IMAGE_BUFFER_FRONT);
892    }
893    if (images.image_mask & __DRI_IMAGE_BUFFER_BACK) {
894       drawable->w = images.back->width;
895       drawable->h = images.back->height;
896       intel_update_image_buffer(intel,
897                                 drawable,
898                                 back_rb,
899                                 images.back,
900                                 __DRI_IMAGE_BUFFER_BACK);
901    }
902 }
903