src/mesa/pipe/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 "sp_clear.h"
  35 #include "sp_context.h"
  36 #include "sp_surface.h"
  37 #include "sp_state.h"
  38 #include "colormac.h"
  39
  40
  41 static GLuint
  42 color_value(GLuint format, const GLfloat color[4])
  43 {
  44    GLubyte r, g, b, a;
  45
  46    UNCLAMPED_FLOAT_TO_UBYTE(r, color[0]);
  47    UNCLAMPED_FLOAT_TO_UBYTE(g, color[1]);
  48    UNCLAMPED_FLOAT_TO_UBYTE(b, color[2]);
  49    UNCLAMPED_FLOAT_TO_UBYTE(a, color[3]);
  50
  51    switch (format) {
  52    case PIPE_FORMAT_U_R8_G8_B8_A8:
  53       return (r << 24) | (g << 16) | (b << 8) | a;
  54    case PIPE_FORMAT_U_A8_R8_G8_B8:
  55       return (a << 24) | (r << 16) | (g << 8) | b;
  56    case PIPE_FORMAT_U_R5_G6_B5:
  57       return ((r & 0xf8) << 8) | ((g & 0xfc) << 3) | (b >> 3);
  58    default:
  59       return 0;
  60    }
  61 }
  62
  63
  64 void
  65 softpipe_clear(struct pipe_context *pipe, GLboolean color, GLboolean depth,
  66                GLboolean stencil, GLboolean accum)
  67 {
  68    struct softpipe_context *softpipe = softpipe_context(pipe);
  69    GLint x, y, w, h;
  70
  71    softpipe_update_derived(softpipe); /* not needed?? */
  72
  73    x = 0;
  74    y = 0;
  75    w = softpipe->framebuffer.cbufs[0]->width;
  76    h = softpipe->framebuffer.cbufs[0]->height;
  77
  78    if (color) {
  79       GLuint i;
  80       for (i = 0; i < softpipe->framebuffer.num_cbufs; i++) {
  81          struct pipe_surface *ps = softpipe->framebuffer.cbufs[i];
  82          GLuint clearVal = color_value(ps->format,
  83                                        softpipe->clear_color.color);
  84          pipe->region_fill(pipe, ps->region, 0, x, y, w, h, clearVal, ~0);
  85       }
  86    }
  87
  88    if (depth && stencil &&
  89        softpipe->framebuffer.zbuf == softpipe->framebuffer.sbuf) {
  90       /* clear Z and stencil together */
  91       struct pipe_surface *ps = softpipe->framebuffer.zbuf;
  92       if (ps->format == PIPE_FORMAT_S8_Z24) {
  93          GLuint mask = (softpipe->stencil.write_mask[0] << 8) | 0xffffff;
  94          GLuint clearVal = (GLuint) (softpipe->depth_test.clear * 0xffffff);
  95
  96          assert (mask == ~0);
  97
  98          clearVal |= (softpipe->stencil.clear_value << 24);
  99          pipe->region_fill(pipe, ps->region, 0, x, y, w, h, clearVal, ~0);
 100       }
 101       else {
 102          /* XXX Z24_S8 format? */
 103          assert(0);
 104       }
 105    }
 106    else {
 107       /* separate Z and stencil */
 108       if (depth) {
 109          struct pipe_surface *ps = softpipe->framebuffer.zbuf;
 110          GLuint clearVal;
 111
 112          switch (ps->format) {
 113          case PIPE_FORMAT_U_Z16:
 114             clearVal = (GLuint) (softpipe->depth_test.clear * 65535.0);
 115             break;
 116          case PIPE_FORMAT_U_Z32:
 117             clearVal = (GLuint) (softpipe->depth_test.clear * 0xffffffff);
 118             break;
 119          case PIPE_FORMAT_S8_Z24:
 120             clearVal = (GLuint) (softpipe->depth_test.clear * 0xffffff);
 121             break;
 122          default:
 123             assert(0);
 124          }
 125
 126          pipe->region_fill(pipe, ps->region, 0, x, y, w, h, clearVal, ~0);
 127       }
 128
 129       if (stencil) {
 130          struct pipe_surface *ps = softpipe->framebuffer.sbuf;
 131          GLuint clearVal = softpipe->stencil.clear_value;
 132
 133          /* If this is not ~0, we shouldn't get here - clear should be
 134           * done with geometry instead.
 135           */
 136          GLuint mask = softpipe->stencil.write_mask[0];
 137
 138          assert((mask & 0xff) == 0xff);
 139
 140          switch (ps->format) {
 141          case PIPE_FORMAT_S8_Z24:
 142             clearVal = clearVal << 24;
 143             mask = mask << 24;
 144             break;
 145          case PIPE_FORMAT_U_S8:
 146             /* nothing */
 147             break;
 148          default:
 149             assert(0);
 150          }
 151
 152          pipe->region_fill(pipe, ps->region, 0, x, y, w, h, clearVal, mask);
 153       }
 154    }
 155
 156    if (accum) {
 157       /* XXX there might be no notion of accum buffers in 'pipe'.
 158        * Just implement them with a deep RGBA surface format...
 159        */
 160       struct pipe_surface *ps = softpipe->framebuffer.abuf;
 161       GLuint clearVal = 0x0; /* XXX FIX */
 162       GLuint mask = ~0;
 163       assert(ps);
 164       pipe->region_fill(pipe, ps->region, 0, x, y, w, h, clearVal, mask);
 165    }
 166 }