src/gallium/drivers/softpipe/sp_quad_pipe.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
  29 #include "sp_context.h"
  30 #include "sp_state.h"
  31 #include "pipe/p_shader_tokens.h"
  32
  33 static void
  34 sp_push_quad_first( struct softpipe_context *sp,
  35                     struct quad_stage *quad )
  36 {
  37    quad->next = sp->quad.first;
  38    sp->quad.first = quad;
  39 }
  40
  41
  42 void
  43 sp_build_quad_pipeline(struct softpipe_context *sp)
  44 {
  45    boolean early_depth_test =
  46       sp->depth_stencil->depth.enabled &&
  47       sp->framebuffer.zsbuf &&
  48       !sp->depth_stencil->alpha.enabled &&
  49       !sp->fs->info.uses_kill &&
  50       !sp->fs->info.writes_z;
  51
  52    sp->quad.first = sp->quad.blend;
  53
  54    if (early_depth_test) {
  55       sp_push_quad_first( sp, sp->quad.shade );
  56       sp_push_quad_first( sp, sp->quad.depth_test );
  57    }
  58    else {
  59       sp_push_quad_first( sp, sp->quad.depth_test );
  60       sp_push_quad_first( sp, sp->quad.shade );
  61    }
  62 }
  63