intel_context.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

void
intelInitDriverFunctions(struct dd_function_table *functions)
{
   _mesa_init_driver_functions(functions);

   functions->Flush = intelFlush;
   functions->Finish = intelFinish;
   functions->GetString = intelGetString;
   functions->UpdateState = intelInvalidateState;

   functions->CopyColorTable = _swrast_CopyColorTable;
   functions->CopyColorSubTable = _swrast_CopyColorSubTable;
   functions->CopyConvolutionFilter1D = _swrast_CopyConvolutionFilter1D;
   functions->CopyConvolutionFilter2D = _swrast_CopyConvolutionFilter2D;

   functions->BeginQuery = intelBeginQuery;
   functions->EndQuery = intelEndQuery;

   intelInitTextureFuncs(functions);
   intelInitStateFuncs(functions);
   intelInitBufferFuncs(functions);
   intelInitPixelFuncs(functions);
}


GLboolean
intelInitContext(struct intel_context *intel,
                 const __GLcontextModes * mesaVis,
                 __DRIcontextPrivate * driContextPriv,
                 void *sharedContextPrivate,
                 struct dd_function_table *functions)
{
   GLcontext *ctx = &intel->ctx;
   GLcontext *shareCtx = (GLcontext *) sharedContextPrivate;
   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
   volatile struct drm_i915_sarea *saPriv = (struct drm_i915_sarea *)
      (((GLubyte *) sPriv->pSAREA) + intelScreen->sarea_priv_offset);
   int fthrottle_mode;

   if (!_mesa_initialize_context(&intel->ctx, mesaVis, shareCtx,
                                 functions, (void *) intel)) {
      _mesa_printf("%s: failed to init mesa context\n", __FUNCTION__);
      return GL_FALSE;
   }

   driContextPriv->driverPrivate = intel;
   intel->intelScreen = intelScreen;
   intel->driScreen = sPriv;
   intel->sarea = saPriv;

   /* Dri stuff */
   intel->hHWContext = driContextPriv->hHWContext;
   intel->driFd = sPriv->fd;
   intel->driHwLock = sPriv->lock;

   intel->width = intelScreen->width;
   intel->height = intelScreen->height;

   driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
                       intel->driScreen->myNum,
		       IS_965(intelScreen->deviceID) ? "i965" : "i915");
   if (intelScreen->deviceID == PCI_CHIP_I865_G)
      intel->maxBatchSize = 4096;
   else
      intel->maxBatchSize = BATCH_SZ;

   if (!intel_init_bufmgr(intel))
      return GL_FALSE;

   ctx->Const.MaxTextureMaxAnisotropy = 2.0;

   /* This doesn't yet catch all non-conformant rendering, but it's a
    * start.
    */
   if (getenv("INTEL_STRICT_CONFORMANCE")) {
      intel->strict_conformance = 1;
   }

   if (intel->strict_conformance) {
      ctx->Const.MinLineWidth = 1.0;
      ctx->Const.MinLineWidthAA = 1.0;
      ctx->Const.MaxLineWidth = 1.0;
      ctx->Const.MaxLineWidthAA = 1.0;
      ctx->Const.LineWidthGranularity = 1.0;
   }
   else {
      ctx->Const.MinLineWidth = 1.0;
      ctx->Const.MinLineWidthAA = 1.0;
      ctx->Const.MaxLineWidth = 5.0;
      ctx->Const.MaxLineWidthAA = 5.0;
      ctx->Const.LineWidthGranularity = 0.5;
   }

   ctx->Const.MinPointSize = 1.0;
   ctx->Const.MinPointSizeAA = 1.0;
   ctx->Const.MaxPointSize = 255.0;
   ctx->Const.MaxPointSizeAA = 3.0;
   ctx->Const.PointSizeGranularity = 1.0;

   /* reinitialize the context point state.
    * It depend on constants in __GLcontextRec::Const
    */
   _mesa_init_point(ctx);

   ctx->Const.MaxColorAttachments = 4;  /* XXX FBO: review this */

   /* Initialize the software rasterizer and helper modules. */
   _swrast_CreateContext(ctx);
   _vbo_CreateContext(ctx);
   _tnl_CreateContext(ctx);
   _swsetup_CreateContext(ctx);
 
   /* Configure swrast to match hardware characteristics: */
   _swrast_allow_pixel_fog(ctx, GL_FALSE);
   _swrast_allow_vertex_fog(ctx, GL_TRUE);

   intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
   intel->hw_stipple = 1;

   /* XXX FBO: this doesn't seem to be used anywhere */
   switch (mesaVis->depthBits) {
   case 0:                     /* what to do in this case? */
   case 16:
      intel->polygon_offset_scale = 1.0;
      break;
   case 24:
      intel->polygon_offset_scale = 2.0;     /* req'd to pass glean */
      break;
   default:
      assert(0);
      break;
   }

   if (IS_965(intelScreen->deviceID))
      intel->polygon_offset_scale /= 0xffff;

   intel->RenderIndex = ~0;

   fthrottle_mode = driQueryOptioni(&intel->optionCache, "fthrottle_mode");
   intel->irqsEmitted = 0;

   intel->do_irqs = (intel->intelScreen->irq_active &&
                     fthrottle_mode == DRI_CONF_FTHROTTLE_IRQS);

   intel->do_usleeps = (fthrottle_mode == DRI_CONF_FTHROTTLE_USLEEPS);

   _math_matrix_ctr(&intel->ViewportMatrix);

   if (IS_965(intelScreen->deviceID) && !intel->intelScreen->irq_active) {
      _mesa_printf("IRQs not active.  Exiting\n");
      exit(1);
   }

   intelInitExtensions(ctx, GL_FALSE);

   INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
   if (INTEL_DEBUG & DEBUG_BUFMGR)
      dri_bufmgr_set_debug(intel->bufmgr, GL_TRUE);

   if (!sPriv->dri2.enabled)
      intel_recreate_static_regions(intel);

   intel->batch = intel_batchbuffer_alloc(intel);
   intel->last_swap_fence = NULL;
   intel->first_swap_fence = NULL;

   intel_bufferobj_init(intel);
   intel_fbo_init(intel);

   if (intel->ctx.Mesa_DXTn) {
      _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
      _mesa_enable_extension(ctx, "GL_S3_s3tc");
   }
   else if (driQueryOptionb(&intel->optionCache, "force_s3tc_enable")) {
      _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
   }

   intel->prim.primitive = ~0;

   /* Force all software fallbacks */
   if (driQueryOptionb(&intel->optionCache, "no_rast")) {
      fprintf(stderr, "disabling 3D rasterization\n");
      FALLBACK(intel, INTEL_FALLBACK_USER, 1);
      intel->no_rast = 1;
   }

   /* Disable all hardware rendering (skip emitting batches and fences/waits
    * to the kernel)
    */
   intel->no_hw = getenv("INTEL_NO_HW") != NULL;

   return GL_TRUE;
}

void
intelDestroyContext(__DRIcontextPrivate * driContextPriv)
{
   struct intel_context *intel =
      (struct intel_context *) driContextPriv->driverPrivate;

   assert(intel);               /* should never be null */
   if (intel) {
      GLboolean release_texture_heaps;

      INTEL_FIREVERTICES(intel);

      intel->vtbl.destroy(intel);

      release_texture_heaps = (intel->ctx.Shared->RefCount == 1);
      _swsetup_DestroyContext(&intel->ctx);
      _tnl_DestroyContext(&intel->ctx);
      _vbo_DestroyContext(&intel->ctx);

      _swrast_DestroyContext(&intel->ctx);
      intel->Fallback = 0;      /* don't call _swrast_Flush later */

      intel_batchbuffer_free(intel->batch);

      if (intel->last_swap_fence) {
	 dri_fence_wait(intel->last_swap_fence);
	 dri_fence_unreference(intel->last_swap_fence);
	 intel->last_swap_fence = NULL;
      }
      if (intel->first_swap_fence) {
	 dri_fence_wait(intel->first_swap_fence);
	 dri_fence_unreference(intel->first_swap_fence);
	 intel->first_swap_fence = NULL;
      }

      if (release_texture_heaps) {
         /* This share group is about to go away, free our private
          * texture object data.
          */
         if (INTEL_DEBUG & DEBUG_TEXTURE)
            fprintf(stderr, "do something to free texture heaps\n");
      }

      /* free the Mesa context */
      _mesa_free_context_data(&intel->ctx);

      dri_bufmgr_destroy(intel->bufmgr);
   }
}

GLboolean
intelUnbindContext(__DRIcontextPrivate * driContextPriv)
{
   return GL_TRUE;
}

GLboolean
intelMakeCurrent(__DRIcontextPrivate * driContextPriv,
                 __DRIdrawablePrivate * driDrawPriv,
                 __DRIdrawablePrivate * driReadPriv)
{
   __DRIscreenPrivate *psp = driDrawPriv->driScreenPriv;

   if (driContextPriv) {
      struct intel_context *intel =
         (struct intel_context *) driContextPriv->driverPrivate;
      struct intel_framebuffer *intel_fb =
	 (struct intel_framebuffer *) driDrawPriv->driverPrivate;
      GLframebuffer *readFb = (GLframebuffer *) driReadPriv->driverPrivate;


      /* XXX FBO temporary fix-ups! */
      /* if the renderbuffers don't have regions, init them from the context */
      if (!driContextPriv->driScreenPriv->dri2.enabled) {
         struct intel_renderbuffer *irbDepth
            = intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH);
         struct intel_renderbuffer *irbStencil
            = intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL);

         if (intel_fb->color_rb[0]) {
	    intel_renderbuffer_set_region(intel_fb->color_rb[0],
					  intel->front_region);
         }
         if (intel_fb->color_rb[1]) {
	    intel_renderbuffer_set_region(intel_fb->color_rb[1],
					  intel->back_region);
         }
#if 0
         if (intel_fb->color_rb[2]) {
	    intel_renderbuffer_set_region(intel_fb->color_rb[2],
					  intel->third_region);
         }
#endif
         if (irbDepth) {
	    intel_renderbuffer_set_region(irbDepth, intel->depth_region);
         }
         if (irbStencil) {
	    intel_renderbuffer_set_region(irbStencil, intel->depth_region);
         }
      }

      /* set GLframebuffer size to match window, if needed */
      driUpdateFramebufferSize(&intel->ctx, driDrawPriv);

      if (driReadPriv != driDrawPriv) {
	 driUpdateFramebufferSize(&intel->ctx, driReadPriv);
      }

      _mesa_make_current(&intel->ctx, &intel_fb->Base, readFb);

      /* The drawbuffer won't always be updated by _mesa_make_current: 
       */
      if (intel->ctx.DrawBuffer == &intel_fb->Base) {

	 if (intel->driReadDrawable != driReadPriv)
	    intel->driReadDrawable = driReadPriv;

	 if (intel->driDrawable != driDrawPriv) {
	    if (driDrawPriv->swap_interval == (unsigned)-1) {
	       int i;

	       driDrawPriv->vblFlags = (intel->intelScreen->irq_active != 0)
		  ? driGetDefaultVBlankFlags(&intel->optionCache)
		 : VBLANK_FLAG_NO_IRQ;

	       (*psp->systemTime->getUST) (&intel_fb->swap_ust);
	       driDrawableInitVBlank(driDrawPriv);
	       intel_fb->vbl_waited = driDrawPriv->vblSeq;

	       for (i = 0; i < (intel->intelScreen->third.handle ? 3 : 2); i++) {
		  if (intel_fb->color_rb[i])
		     intel_fb->color_rb[i]->vbl_pending = driDrawPriv->vblSeq;
	       }
	    }
	    intel->driDrawable = driDrawPriv;
	    intelWindowMoved(intel);
	 }

	 intel_draw_buffer(&intel->ctx, &intel_fb->Base);
      }
   }
   else {
      _mesa_make_current(NULL, NULL, NULL);
   }

   return GL_TRUE;
}

static void
intelContendedLock(struct intel_context *intel, GLuint flags)
{
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   __DRIscreenPrivate *sPriv = intel->driScreen;
   volatile struct drm_i915_sarea *sarea = intel->sarea;
   int me = intel->hHWContext;

   drmGetLock(intel->driFd, intel->hHWContext, flags);
   intel->locked = 1;

   if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - got contended lock\n", __progname);

   /* If the window moved, may need to set a new cliprect now.
    *
    * NOTE: This releases and regains the hw lock, so all state
    * checking must be done *after* this call:
    */
   if (dPriv)
       DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);

   if (sarea && sarea->ctxOwner != me) {
      if (INTEL_DEBUG & DEBUG_BUFMGR) {
	 fprintf(stderr, "Lost Context: sarea->ctxOwner %x me %x\n",
		 sarea->ctxOwner, me);
      }
      sarea->ctxOwner = me;
   }

   /* If the last consumer of the texture memory wasn't us, notify the fake
    * bufmgr and record the new owner.  We should have the memory shared
    * between contexts of a single fake bufmgr, but this will at least make
    * things correct for now.
    */
   if (!intel->ttm && sarea->texAge != intel->hHWContext) {
      sarea->texAge = intel->hHWContext;
      dri_bufmgr_fake_contended_lock_take(intel->bufmgr);
      if (INTEL_DEBUG & DEBUG_BATCH)
	 intel_decode_context_reset();
      if (INTEL_DEBUG & DEBUG_BUFMGR)
	 fprintf(stderr, "Lost Textures: sarea->texAge %x hw context %x\n",
		 sarea->ctxOwner, intel->hHWContext);
   }

   if (sarea->width != intel->width || sarea->height != intel->height) {
       int numClipRects = intel->numClipRects;

       /*
	* FIXME: Really only need to do this when drawing to a
	* common back- or front buffer.
	*/

       /*
	* This will essentially drop the outstanding batchbuffer on
	* the floor.
	*/
       intel->numClipRects = 0;

       if (intel->Fallback)
	   _swrast_flush(&intel->ctx);

       if (!IS_965(intel->intelScreen->deviceID))
	   INTEL_FIREVERTICES(intel);

       if (intel->batch->map != intel->batch->ptr)
	   intel_batchbuffer_flush(intel->batch);

       intel->numClipRects = numClipRects;

       /* force window update */
       intel->lastStamp = 0;

       intel->width = sarea->width;
       intel->height = sarea->height;
   }

   /* Drawable changed?
    */
   if (dPriv && intel->lastStamp != dPriv->lastStamp) {
       intelWindowMoved(intel);
       intel->lastStamp = dPriv->lastStamp;
   }
}


_glthread_DECLARE_STATIC_MUTEX(lockMutex);

/* Lock the hardware and validate our state.  
 */
void LOCK_HARDWARE( struct intel_context *intel )
{
    __DRIdrawable *dPriv = intel->driDrawable;
    __DRIscreen *sPriv = intel->driScreen;
    char __ret = 0;
    struct intel_framebuffer *intel_fb = NULL;
    struct intel_renderbuffer *intel_rb = NULL;

    _glthread_LOCK_MUTEX(lockMutex);
    assert(!intel->locked);
    intel->locked = 1;

    if (intel->driDrawable) {
       intel_fb = intel->driDrawable->driverPrivate;

       if (intel_fb)
	  intel_rb =
	     intel_get_renderbuffer(&intel_fb->Base,
				    intel_fb->Base._ColorDrawBufferIndexes[0]);
    }

    if (intel_rb && dPriv->vblFlags &&
	!(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ) &&
	(intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
	drmVBlank vbl;

	vbl.request.type = DRM_VBLANK_ABSOLUTE;

	if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
	    vbl.request.type |= DRM_VBLANK_SECONDARY;
	}

	vbl.request.sequence = intel_rb->vbl_pending;
	drmWaitVBlank(intel->driFd, &vbl);
	intel_fb->vbl_waited = vbl.reply.sequence;
    }

    DRM_CAS(intel->driHwLock, intel->hHWContext,
        (DRM_LOCK_HELD|intel->hHWContext), __ret);

    if (sPriv->dri2.enabled) {
	if (__ret)
	    drmGetLock(intel->driFd, intel->hHWContext, 0);
	if (__driParseEvents(dPriv->driContextPriv, dPriv)) {
	    intelWindowMoved(intel);
	    intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
	}
    } else if (__ret) {
        intelContendedLock( intel, 0 );
    }


    if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - locked\n", __progname);
}


/* Unlock the hardware using the global current context 
 */
void UNLOCK_HARDWARE( struct intel_context *intel )
{
   intel->vtbl.note_unlock( intel );
   intel->locked = 0;

   DRM_UNLOCK(intel->driFd, intel->driHwLock, intel->hHWContext);

   _glthread_UNLOCK_MUTEX(lockMutex);

   if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - unlocked\n", __progname);

   /**
    * Nothing should be left in batch outside of LOCK/UNLOCK which references
    * cliprects.
    */
   assert(intel->batch->cliprect_mode != REFERENCES_CLIPRECTS);
}