intel_blit.c

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

#ifndef I915
   if (dst_tiled) {
      CMD |= XY_DST_TILED;
      dst_pitch /= 4;
   }
   if (src_tiled) {
      CMD |= XY_SRC_TILED;
      src_pitch /= 4;
   }
#endif

   if (dst_y2 <= dst_y || dst_x2 <= dst_x) {
      return;
   }

   /* Initial y values don't seem to work with negative pitches.  If
    * we adjust the offsets manually (below), it seems to work fine.
    *
    * On the other hand, if we always adjust, the hardware doesn't
    * know which blit directions to use, so overlapping copypixels get
    * the wrong result.
    */
   if (dst_pitch > 0 && src_pitch > 0) {
      assert(dst_x < dst_x2);
      assert(dst_y < dst_y2);

      BEGIN_BATCH(8, NO_LOOP_CLIPRECTS);
      OUT_BATCH(CMD);
      OUT_BATCH(BR13 | dst_pitch);
      OUT_BATCH((dst_y << 16) | dst_x);
      OUT_BATCH((dst_y2 << 16) | dst_x2);
      OUT_RELOC(dst_buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_WRITE,
		dst_offset);
      OUT_BATCH((src_y << 16) | src_x);
      OUT_BATCH(src_pitch);
      OUT_RELOC(src_buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ,
		src_offset);
      ADVANCE_BATCH();
   }
   else {
      assert(dst_x < dst_x2);
      assert(h > 0);

      BEGIN_BATCH(8, NO_LOOP_CLIPRECTS);
      OUT_BATCH(CMD);
      OUT_BATCH(BR13 | ((uint16_t)dst_pitch));
      OUT_BATCH((0 << 16) | dst_x);
      OUT_BATCH((h << 16) | dst_x2);
      OUT_RELOC(dst_buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_WRITE,
		dst_offset + dst_y * dst_pitch);
      OUT_BATCH((0 << 16) | src_x);
      OUT_BATCH(src_pitch);
      OUT_RELOC(src_buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ,
		src_offset + src_y * src_pitch);
      ADVANCE_BATCH();
   }
}


/**
 * Use blitting to clear the renderbuffers named by 'flags'.
 * Note: we can't use the ctx->DrawBuffer->_ColorDrawBufferIndexes field
 * since that might include software renderbuffers or renderbuffers
 * which we're clearing with triangles.
 * \param mask  bitmask of BUFFER_BIT_* values indicating buffers to clear
 */
void
intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
{
   struct intel_context *intel = intel_context(ctx);
   struct gl_framebuffer *fb = ctx->DrawBuffer;
   GLuint clear_depth;
   GLbitfield skipBuffers = 0;
   BATCH_LOCALS;

   /*
    * Compute values for clearing the buffers.
    */
   clear_depth = 0;
   if (mask & BUFFER_BIT_DEPTH) {
      clear_depth = (GLuint) (fb->_DepthMax * ctx->Depth.Clear);
   }
   if (mask & BUFFER_BIT_STENCIL) {
      clear_depth |= (ctx->Stencil.Clear & 0xff) << 24;
   }

   /* If clearing both depth and stencil, skip BUFFER_BIT_STENCIL in
    * the loop below.
    */
   if ((mask & BUFFER_BIT_DEPTH) && (mask & BUFFER_BIT_STENCIL)) {
      skipBuffers = BUFFER_BIT_STENCIL;
   }

   /* XXX Move this flush/lock into the following conditional? */
   intelFlush(&intel->ctx);
   LOCK_HARDWARE(intel);

   if (intel->numClipRects) {
      GLint cx, cy, cw, ch;
      drm_clip_rect_t clear;
      int i;

      /* Get clear bounds after locking */
      cx = fb->_Xmin;
      cy = fb->_Ymin;
      cw = fb->_Xmax - cx;
      ch = fb->_Ymax - cy;

      if (fb->Name == 0) {
         /* clearing a window */

         /* flip top to bottom */
         clear.x1 = cx + intel->drawX;
         clear.y1 = intel->driDrawable->y + intel->driDrawable->h - cy - ch;
         clear.x2 = clear.x1 + cw;
         clear.y2 = clear.y1 + ch;
      }
      else {
         /* clearing FBO */
         assert(intel->numClipRects == 1);
         assert(intel->pClipRects == &intel->fboRect);
         clear.x1 = cx;
         clear.y1 = cy;
         clear.x2 = clear.x1 + cw;
         clear.y2 = clear.y1 + ch;
         /* no change to mask */
      }

      for (i = 0; i < intel->numClipRects; i++) {
         const drm_clip_rect_t *box = &intel->pClipRects[i];
         drm_clip_rect_t b;
         GLuint buf;
         GLuint clearMask = mask;      /* use copy, since we modify it below */
         GLboolean all = (cw == fb->Width && ch == fb->Height);

         if (!all) {
            intel_intersect_cliprects(&b, &clear, box);
         }
         else {
            b = *box;
         }

         if (b.x1 >= b.x2 || b.y1 >= b.y2)
            continue;

         if (0)
            _mesa_printf("clear %d,%d..%d,%d, mask %x\n",
                         b.x1, b.y1, b.x2, b.y2, mask);

         /* Loop over all renderbuffers */
         for (buf = 0; buf < BUFFER_COUNT && clearMask; buf++) {
            const GLbitfield bufBit = 1 << buf;
            if ((clearMask & bufBit) && !(bufBit & skipBuffers)) {
               /* OK, clear this renderbuffer */
               struct intel_region *irb_region =
		  intel_get_rb_region(fb, buf);
               dri_bo *write_buffer =
                  intel_region_buffer(intel, irb_region,
                                      all ? INTEL_WRITE_FULL :
                                      INTEL_WRITE_PART);

               GLuint clearVal;
               GLint pitch, cpp;
               GLuint BR13, CMD;

               ASSERT(irb_region);

               pitch = irb_region->pitch;
               cpp = irb_region->cpp;

               DBG("%s dst:buf(%p)/%d+%d %d,%d sz:%dx%d\n",
                   __FUNCTION__,
                   irb_region->buffer, (pitch * cpp),
                   irb_region->draw_offset,
                   b.x1, b.y1, b.x2 - b.x1, b.y2 - b.y1);

	       BR13 = 0xf0 << 16;
	       CMD = XY_COLOR_BLT_CMD;

               /* Setup the blit command */
               if (cpp == 4) {
                  BR13 |= (1 << 24) | (1 << 25);
                  if (buf == BUFFER_DEPTH || buf == BUFFER_STENCIL) {
                     if (clearMask & BUFFER_BIT_DEPTH)
                        CMD |= XY_BLT_WRITE_RGB;
                     if (clearMask & BUFFER_BIT_STENCIL)
                        CMD |= XY_BLT_WRITE_ALPHA;
                  }
                  else {
                     /* clearing RGBA */
                     CMD |= XY_BLT_WRITE_ALPHA | XY_BLT_WRITE_RGB;
                  }
               }
               else {
                  ASSERT(cpp == 2 || cpp == 0);
                  BR13 |= (1 << 24);
               }

#ifndef I915
	       if (irb_region->tiled) {
		  CMD |= XY_DST_TILED;
		  pitch /= 4;
	       }
#endif
	       BR13 |= (pitch * cpp);

               if (buf == BUFFER_DEPTH || buf == BUFFER_STENCIL) {
                  clearVal = clear_depth;
               }
               else {
                  clearVal = (cpp == 4)
                     ? intel->ClearColor8888 : intel->ClearColor565;
               }
               /*
                  _mesa_debug(ctx, "hardware blit clear buf %d rb id %d\n",
                  buf, irb->Base.Name);
                */
	       intel_wait_flips(intel);

               assert(b.x1 < b.x2);
               assert(b.y1 < b.y2);

               BEGIN_BATCH(6, REFERENCES_CLIPRECTS);
               OUT_BATCH(CMD);
               OUT_BATCH(BR13);
               OUT_BATCH((b.y1 << 16) | b.x1);
               OUT_BATCH((b.y2 << 16) | b.x2);
               OUT_RELOC(write_buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_WRITE,
                         irb_region->draw_offset);
               OUT_BATCH(clearVal);
               ADVANCE_BATCH();
               clearMask &= ~bufBit;    /* turn off bit, for faster loop exit */
            }
         }
      }
      intel_batchbuffer_flush(intel->batch);
   }

   UNLOCK_HARDWARE(intel);
}

void
intelEmitImmediateColorExpandBlit(struct intel_context *intel,
				  GLuint cpp,
				  GLubyte *src_bits, GLuint src_size,
				  GLuint fg_color,
				  GLshort dst_pitch,
				  dri_bo *dst_buffer,
				  GLuint dst_offset,
				  GLboolean dst_tiled,
				  GLshort x, GLshort y,
				  GLshort w, GLshort h,
				  GLenum logic_op)
{
   int dwords = ALIGN(src_size, 8) / 4;
   uint32_t opcode, br13, blit_cmd;

   assert( logic_op - GL_CLEAR >= 0 );
   assert( logic_op - GL_CLEAR < 0x10 );

   if (w < 0 || h < 0)
      return;

   dst_pitch *= cpp;

   DBG("%s dst:buf(%p)/%d+%d %d,%d sz:%dx%d, %d bytes %d dwords\n",
       __FUNCTION__,
       dst_buffer, dst_pitch, dst_offset, x, y, w, h, src_size, dwords);

   intel_batchbuffer_require_space( intel->batch,
				    (8 * 4) +
				    (3 * 4) +
				    dwords,
				    NO_LOOP_CLIPRECTS );

   opcode = XY_SETUP_BLT_CMD;
   if (cpp == 4)
      opcode |= XY_BLT_WRITE_ALPHA | XY_BLT_WRITE_RGB;
#ifndef I915
   if (dst_tiled) {
      opcode |= XY_DST_TILED;
      dst_pitch /= 4;
   }
#endif

   br13 = dst_pitch | (translate_raster_op(logic_op) << 16) | (1 << 29);
   if (cpp == 2)
      br13 |= BR13_565;
   else
      br13 |= BR13_8888;

   blit_cmd = XY_TEXT_IMMEDIATE_BLIT_CMD | XY_TEXT_BYTE_PACKED; /* packing? */
   if (dst_tiled)
      blit_cmd |= XY_DST_TILED;

   BEGIN_BATCH(8 + 3, NO_LOOP_CLIPRECTS);
   OUT_BATCH(opcode);
   OUT_BATCH(br13);
   OUT_BATCH((0 << 16) | 0); /* clip x1, y1 */
   OUT_BATCH((100 << 16) | 100); /* clip x2, y2 */
   OUT_RELOC(dst_buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_WRITE, dst_offset);
   OUT_BATCH(0); /* bg */
   OUT_BATCH(fg_color); /* fg */
   OUT_BATCH(0); /* pattern base addr */

   OUT_BATCH(blit_cmd | ((3 - 2) + dwords));
   OUT_BATCH((y << 16) | x);
   OUT_BATCH(((y + h) << 16) | (x + w));
   ADVANCE_BATCH();

   intel_batchbuffer_data( intel->batch,
			   src_bits,
			   dwords * 4,
			   NO_LOOP_CLIPRECTS );
}