intel_buffers.c

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

/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/

#include "intel_screen.h"
#include "intel_context.h"
#include "intel_blit.h"
#include "intel_buffers.h"
#include "intel_chipset.h"
#include "intel_depthstencil.h"
#include "intel_fbo.h"
#include "intel_regions.h"
#include "intel_batchbuffer.h"
#include "intel_reg.h"
#include "context.h"
#include "utils.h"
#include "drirenderbuffer.h"
#include "framebuffer.h"
#include "swrast/swrast.h"
#include "vblank.h"
#include "i915_drm.h"

/* This block can be removed when libdrm >= 2.3.1 is required */

#ifndef DRM_IOCTL_I915_FLIP

#define DRM_VBLANK_FLIP 0x8000000

typedef struct drm_i915_flip {
   int pipes;
} drm_i915_flip_t;

#undef DRM_IOCTL_I915_FLIP
#define DRM_IOCTL_I915_FLIP DRM_IOW(DRM_COMMAND_BASE + DRM_I915_FLIP, \
				    drm_i915_flip_t)

#endif

#define FILE_DEBUG_FLAG DEBUG_BLIT

/**
 * XXX move this into a new dri/common/cliprects.c file.
 */
GLboolean
intel_intersect_cliprects(drm_clip_rect_t * dst,
                          const drm_clip_rect_t * a,
                          const drm_clip_rect_t * b)
{
   GLint bx = b->x1;
   GLint by = b->y1;
   GLint bw = b->x2 - bx;
   GLint bh = b->y2 - by;

   if (bx < a->x1)
      bw -= a->x1 - bx, bx = a->x1;
   if (by < a->y1)
      bh -= a->y1 - by, by = a->y1;
   if (bx + bw > a->x2)
      bw = a->x2 - bx;
   if (by + bh > a->y2)
      bh = a->y2 - by;
   if (bw <= 0)
      return GL_FALSE;
   if (bh <= 0)
      return GL_FALSE;

   dst->x1 = bx;
   dst->y1 = by;
   dst->x2 = bx + bw;
   dst->y2 = by + bh;

   return GL_TRUE;
}

/**
 * Return pointer to current color drawing region, or NULL.
 */
struct intel_region *
intel_drawbuf_region(struct intel_context *intel)
{
   struct intel_renderbuffer *irbColor =
      intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]);
   if (irbColor)
      return irbColor->region;
   else
      return NULL;
}

/**
 * Return pointer to current color reading region, or NULL.
 */
struct intel_region *
intel_readbuf_region(struct intel_context *intel)
{
   struct intel_renderbuffer *irb
      = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
   if (irb)
      return irb->region;
   else
      return NULL;
}



/**
 * Update the following fields for rendering to a user-created FBO:
 *   intel->numClipRects
 *   intel->pClipRects
 *   intel->drawX
 *   intel->drawY
 */
static void
intelSetRenderbufferClipRects(struct intel_context *intel)
{
   assert(intel->ctx.DrawBuffer->Width > 0);
   assert(intel->ctx.DrawBuffer->Height > 0);
   intel->fboRect.x1 = 0;
   intel->fboRect.y1 = 0;
   intel->fboRect.x2 = intel->ctx.DrawBuffer->Width;
   intel->fboRect.y2 = intel->ctx.DrawBuffer->Height;
   intel->numClipRects = 1;
   intel->pClipRects = &intel->fboRect;
   intel->drawX = 0;
   intel->drawY = 0;
}


/**
 * As above, but for rendering to front buffer of a window.
 * \sa intelSetRenderbufferClipRects
 */
static void
intelSetFrontClipRects(struct intel_context *intel)
{
   __DRIdrawablePrivate *dPriv = intel->driDrawable;

   if (!dPriv)
      return;

   intel->numClipRects = dPriv->numClipRects;
   intel->pClipRects = dPriv->pClipRects;
   intel->drawX = dPriv->x;
   intel->drawY = dPriv->y;
}


/**
 * As above, but for rendering to back buffer of a window.
 */
static void
intelSetBackClipRects(struct intel_context *intel)
{
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   struct intel_framebuffer *intel_fb;

   if (!dPriv)
      return;

   intel_fb = dPriv->driverPrivate;

   if (intel_fb->pf_active || dPriv->numBackClipRects == 0) {
      /* use the front clip rects */
      intel->numClipRects = dPriv->numClipRects;
      intel->pClipRects = dPriv->pClipRects;
      intel->drawX = dPriv->x;
      intel->drawY = dPriv->y;
   }
   else {
      /* use the back clip rects */
      intel->numClipRects = dPriv->numBackClipRects;
      intel->pClipRects = dPriv->pBackClipRects;
      intel->drawX = dPriv->backX;
      intel->drawY = dPriv->backY;
   }
}

static void
intelUpdatePageFlipping(struct intel_context *intel,
			GLint areaA, GLint areaB)
{
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
   GLboolean pf_active;
   GLint pf_planes;

   /* Update page flipping info */
   pf_planes = 0;

   if (areaA > 0)
      pf_planes |= 1;

   if (areaB > 0)
      pf_planes |= 2;

   intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
				(intel_fb->pf_planes & 0x2)) & 0x3;

   intel_fb->pf_num_pages = intel->intelScreen->third.handle ? 3 : 2;

   pf_active = pf_planes && (pf_planes & intel->sarea->pf_active) == pf_planes;

   if (INTEL_DEBUG & DEBUG_LOCK)
      if (pf_active != intel_fb->pf_active)
	 _mesa_printf("%s - Page flipping %sactive\n", __progname,
		      pf_active ? "" : "in");

   if (pf_active) {
      /* Sync pages between planes if flipping on both at the same time */
      if (pf_planes == 0x3 && pf_planes != intel_fb->pf_planes &&
	  (intel->sarea->pf_current_page & 0x3) !=
	  (((intel->sarea->pf_current_page) >> 2) & 0x3)) {
	 drm_i915_flip_t flip;

	 if (intel_fb->pf_current_page ==
	     (intel->sarea->pf_current_page & 0x3)) {
	    /* XXX: This is ugly, but emitting two flips 'in a row' can cause
	     * lockups for unknown reasons.
	     */
	    intel->sarea->pf_current_page =
	       intel->sarea->pf_current_page & 0x3;
	    intel->sarea->pf_current_page |=
	       ((intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
		intel_fb->pf_num_pages) << 2;

	    flip.pipes = 0x2;
	 } else {
	    intel->sarea->pf_current_page =
	       intel->sarea->pf_current_page & (0x3 << 2);
	    intel->sarea->pf_current_page |=
	       (intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
	       intel_fb->pf_num_pages;

	    flip.pipes = 0x1;
	 }

	 drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
      }

      intel_fb->pf_planes = pf_planes;
   }

   intel_fb->pf_active = pf_active;
   intel_flip_renderbuffers(intel_fb);
   intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
}

/**
 * This will be called whenever the currently bound window is moved/resized.
 * XXX: actually, it seems to NOT be called when the window is only moved (BP).
 */
void
intelWindowMoved(struct intel_context *intel)
{
   GLcontext *ctx = &intel->ctx;
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   struct intel_framebuffer *intel_fb = dPriv->driverPrivate;

   if (!intel->ctx.DrawBuffer) {
      /* when would this happen? -BP */
      intelSetFrontClipRects(intel);
   }
   else if (intel->ctx.DrawBuffer->Name != 0) {
      /* drawing to user-created FBO - do nothing */
      /* Cliprects would be set from intelDrawBuffer() */
   }
   else {
      /* drawing to a window */
      switch (intel_fb->Base._ColorDrawBufferIndexes[0]) {
      case BUFFER_FRONT_LEFT:
         intelSetFrontClipRects(intel);
         break;
      case BUFFER_BACK_LEFT:
         intelSetBackClipRects(intel);
         break;
      default:
         intelSetFrontClipRects(intel);
      }
	
   }

   if (!intel->intelScreen->driScrnPriv->dri2.enabled &&
       intel->intelScreen->driScrnPriv->ddx_version.minor >= 7) {
      volatile struct drm_i915_sarea *sarea = intel->sarea;
      drm_clip_rect_t drw_rect = { .x1 = dPriv->x, .x2 = dPriv->x + dPriv->w,
				   .y1 = dPriv->y, .y2 = dPriv->y + dPriv->h };
      drm_clip_rect_t planeA_rect = { .x1 = sarea->planeA_x, .y1 = sarea->planeA_y,
				     .x2 = sarea->planeA_x + sarea->planeA_w,
				     .y2 = sarea->planeA_y + sarea->planeA_h };
      drm_clip_rect_t planeB_rect = { .x1 = sarea->planeB_x, .y1 = sarea->planeB_y,
				     .x2 = sarea->planeB_x + sarea->planeB_w,
				     .y2 = sarea->planeB_y + sarea->planeB_h };
      GLint areaA = driIntersectArea( drw_rect, planeA_rect );
      GLint areaB = driIntersectArea( drw_rect, planeB_rect );
      GLuint flags = dPriv->vblFlags;

      intelUpdatePageFlipping(intel, areaA, areaB);

      /* Update vblank info
       */
      if (areaB > areaA || (areaA == areaB && areaB > 0)) {
	 flags = dPriv->vblFlags | VBLANK_FLAG_SECONDARY;
      } else {
	 flags = dPriv->vblFlags & ~VBLANK_FLAG_SECONDARY;
      }

      /* Check to see if we changed pipes */
      if (flags != dPriv->vblFlags && dPriv->vblFlags &&
	  !(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ)) {
	 int64_t count;
	 drmVBlank vbl;
	 int i;

	 /*
	  * Deal with page flipping
	  */
	 vbl.request.type = DRM_VBLANK_ABSOLUTE;

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

	 for (i = 0; i < intel_fb->pf_num_pages; i++) {
	    if (!intel_fb->color_rb[i] ||
		(intel_fb->vbl_waited - intel_fb->color_rb[i]->vbl_pending) <=
		(1<<23))
	       continue;

	    vbl.request.sequence = intel_fb->color_rb[i]->vbl_pending;
	    drmWaitVBlank(intel->driFd, &vbl);
	 }

	 /*
	  * Update msc_base from old pipe
	  */
	 driDrawableGetMSC32(dPriv->driScreenPriv, dPriv, &count);
	 dPriv->msc_base = count;
	 /*
	  * Then get new vblank_base and vblSeq values
	  */
	 dPriv->vblFlags = flags;
	 driGetCurrentVBlank(dPriv);
	 dPriv->vblank_base = dPriv->vblSeq;