third_party_mesa3d/src/gallium/drivers/llvmpipe/lp_state_surface.c

/**************************************************************************
 * 
 * Copyright 2007 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.
 * 
 **************************************************************************/

/* Authors:  Keith Whitwell <keith@tungstengraphics.com>
 */

#include "pipe/p_state.h"
#include "util/u_inlines.h"
#include "util/u_framebuffer.h"
#include "util/u_surface.h"
#include "lp_context.h"
#include "lp_scene.h"
#include "lp_state.h"
#include "lp_setup.h"

#include "draw/draw_context.h"

#include "util/u_format.h"


/**
 * Set the framebuffer surface info: color buffers, zbuffer, stencil buffer.
 */
void
llvmpipe_set_framebuffer_state(struct pipe_context *pipe,
                               const struct pipe_framebuffer_state *fb)
{
   struct llvmpipe_context *lp = llvmpipe_context(pipe);

   boolean changed = !util_framebuffer_state_equal(&lp->framebuffer, fb);

   assert(fb->width <= LP_MAX_WIDTH);
   assert(fb->height <= LP_MAX_HEIGHT);

   if (changed) {

      util_copy_framebuffer_state(&lp->framebuffer, fb);

      if (LP_PERF & PERF_NO_DEPTH) {
	 pipe_surface_reference(&lp->framebuffer.zsbuf, NULL);
      }

      /* Tell draw module how deep the Z/depth buffer is */
      /* FIXME: mrd constant isn't right should use a value derived from
       * current primitive not a constant (for float depth buffers) */
      if (lp->framebuffer.zsbuf) {
         int depth_bits;
         double mrd;
         depth_bits = util_format_get_component_bits(lp->framebuffer.zsbuf->format,
                                                     UTIL_FORMAT_COLORSPACE_ZS,
                                                     0);
         if (depth_bits > 16) {
            mrd = 0.0000001;
         }
         else {
            mrd = 0.00002;
         }
         lp->mrd = mrd;
         draw_set_mrd(lp->draw, mrd);
      }

      lp_setup_bind_framebuffer( lp->setup, &lp->framebuffer );

      lp->dirty |= LP_NEW_FRAMEBUFFER;
   }
}