src/gallium/drivers/softpipe/sp_clear.c

   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 /* Author:
  29  *    Brian Paul
  30  */
  31
  32
  33 #include "pipe/p_defines.h"
  34 #include "util/u_pack_color.h"
  35 #include "sp_clear.h"
  36 #include "sp_context.h"
  37 #include "sp_surface.h"
  38 #include "sp_state.h"
  39 #include "sp_tile_cache.h"
  40
  41
  42 /**
  43  * Convert packed pixel from one format to another.
  44  */
  45 static unsigned
  46 convert_color(enum pipe_format srcFormat, unsigned srcColor,
  47               enum pipe_format dstFormat)
  48 {
  49    ubyte r, g, b, a;
  50    unsigned dstColor;
  51
  52    util_unpack_color_ub(srcFormat, &srcColor, &r, &g, &b, &a);
  53    util_pack_color_ub(r, g, b, a, dstFormat, &dstColor);
  54
  55    return dstColor;
  56 }
  57
  58
  59
  60 /**
  61  * Clear the given surface to the specified value.
  62  * No masking, no scissor (clear entire buffer).
  63  * Note: when clearing a color buffer, the clearValue is always
  64  * encoded as PIPE_FORMAT_A8R8G8B8_UNORM.
  65  */
  66 void
  67 softpipe_clear(struct pipe_context *pipe, struct pipe_surface *ps,
  68                unsigned clearValue)
  69 {
  70    struct softpipe_context *softpipe = softpipe_context(pipe);
  71    uint i;
  72
  73    if (softpipe->no_rast)
  74       return;
  75
  76 #if 0
  77    softpipe_update_derived(softpipe); /* not needed?? */
  78 #endif
  79
  80    if (ps == sp_tile_cache_get_surface(softpipe->zsbuf_cache)) {
  81       sp_tile_cache_clear(softpipe->zsbuf_cache, clearValue);
  82       softpipe->framebuffer.zsbuf->status = PIPE_SURFACE_STATUS_CLEAR;
  83 #if TILE_CLEAR_OPTIMIZATION
  84       return;
  85 #endif
  86    }
  87
  88    for (i = 0; i < softpipe->framebuffer.num_cbufs; i++) {
  89       if (ps == sp_tile_cache_get_surface(softpipe->cbuf_cache[i])) {
  90          unsigned cv;
  91          if (ps->format != PIPE_FORMAT_A8R8G8B8_UNORM) {
  92             cv = convert_color(PIPE_FORMAT_A8R8G8B8_UNORM, clearValue,
  93                                ps->format);
  94          }
  95          else {
  96             cv = clearValue;
  97          }
  98          sp_tile_cache_clear(softpipe->cbuf_cache[i], cv);
  99          softpipe->framebuffer.cbufs[i]->status = PIPE_SURFACE_STATUS_CLEAR;
 100       }
 101    }
 102
 103 #if !TILE_CLEAR_OPTIMIZATION
 104    /* non-cached surface */
 105    pipe->surface_fill(pipe, ps, 0, 0, ps->width, ps->height, clearValue);
 106 #endif
 107 }