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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
  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 TUNGSTEN GRAPHICS 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. /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29.  */
  30.  
  31. #include "pipe/p_state.h"
  32. #include "util/u_inlines.h"
  33. #include "util/u_framebuffer.h"
  34. #include "util/u_surface.h"
  35. #include "lp_context.h"
  36. #include "lp_scene.h"
  37. #include "lp_state.h"
  38. #include "lp_setup.h"
  39.  
  40. #include "draw/draw_context.h"
  41.  
  42. #include "util/u_format.h"
  43.  
  44.  
  45. /**
  46.  * Set the framebuffer surface info: color buffers, zbuffer, stencil buffer.
  47.  */
  48. void
  49. llvmpipe_set_framebuffer_state(struct pipe_context *pipe,
  50.                                const struct pipe_framebuffer_state *fb)
  51. {
  52.    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  53.  
  54.    boolean changed = !util_framebuffer_state_equal(&lp->framebuffer, fb);
  55.  
  56.    assert(fb->width <= LP_MAX_WIDTH);
  57.    assert(fb->height <= LP_MAX_HEIGHT);
  58.  
  59.    if (changed) {
  60.  
  61.       util_copy_framebuffer_state(&lp->framebuffer, fb);
  62.  
  63.       if (LP_PERF & PERF_NO_DEPTH) {
  64.          pipe_surface_reference(&lp->framebuffer.zsbuf, NULL);
  65.       }
  66.  
  67.       /* Tell draw module how deep the Z/depth buffer is */
  68.       /* FIXME: mrd constant isn't right should use a value derived from
  69.        * current primitive not a constant (for float depth buffers) */
  70.       if (lp->framebuffer.zsbuf) {
  71.          int depth_bits;
  72.          double mrd;
  73.          depth_bits = util_format_get_component_bits(lp->framebuffer.zsbuf->format,
  74.                                                      UTIL_FORMAT_COLORSPACE_ZS,
  75.                                                      0);
  76.          if (depth_bits > 16) {
  77.             mrd = 0.0000001;
  78.          }
  79.          else {
  80.             mrd = 0.00002;
  81.          }
  82.          lp->mrd = mrd;
  83.          draw_set_mrd(lp->draw, mrd);
  84.       }
  85.  
  86.       lp_setup_bind_framebuffer( lp->setup, &lp->framebuffer );
  87.  
  88.       lp->dirty |= LP_NEW_FRAMEBUFFER;
  89.    }
  90. }
  91.