src/gallium/drivers/softpipe/sp_quad.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(
  35    struct softpipe_context *sp,
  36    struct quad_stage       *quad )
  37 {
  38    quad->next = sp->quad.first;
  39    sp->quad.first = quad;
  40 }
  41
  42 static void
  43 sp_build_depth_stencil(
  44    struct softpipe_context *sp )
  45 {
  46    if (sp->depth_stencil->stencil[0].enabled ||
  47        sp->depth_stencil->stencil[1].enabled) {
  48       sp_push_quad_first( sp, sp->quad.stencil_test );
  49    }
  50    else if (sp->depth_stencil->depth.enabled &&
  51             sp->framebuffer.zsbuf) {
  52       sp_push_quad_first( sp, sp->quad.depth_test );
  53    }
  54 }
  55
  56 void
  57 sp_build_quad_pipeline(struct softpipe_context *sp)
  58 {
  59    boolean early_depth_test =
  60                sp->depth_stencil->depth.enabled &&
  61                sp->framebuffer.zsbuf &&
  62                !sp->depth_stencil->alpha.enabled &&
  63                !sp->fs->uses_kill &&
  64                !sp->fs->info.writes_z;
  65
  66    /* build up the pipeline in reverse order... */
  67
  68    sp->quad.first = sp->quad.output;
  69
  70    if (sp->blend->colormask != 0xf) {
  71       sp_push_quad_first( sp, sp->quad.colormask );
  72    }
  73
  74    if (sp->blend->blend_enable ||
  75        sp->blend->logicop_enable) {
  76       sp_push_quad_first( sp, sp->quad.blend );
  77    }
  78
  79    if (sp->framebuffer.num_cbufs == 1) {
  80       /* the usual case: write to exactly one colorbuf */
  81       sp->current_cbuf = 0;
  82    }
  83    else {
  84       /* insert bufloop stage */
  85       sp_push_quad_first( sp, sp->quad.bufloop );
  86    }
  87
  88    if (sp->depth_stencil->depth.occlusion_count) {
  89       sp_push_quad_first( sp, sp->quad.occlusion );
  90    }
  91
  92    if (sp->rasterizer->poly_smooth ||
  93        sp->rasterizer->line_smooth ||
  94        sp->rasterizer->point_smooth) {
  95       sp_push_quad_first( sp, sp->quad.coverage );
  96    }
  97
  98    if (!early_depth_test) {
  99       sp_build_depth_stencil( sp );
 100    }
 101
 102    if (sp->depth_stencil->alpha.enabled) {
 103       sp_push_quad_first( sp, sp->quad.alpha_test );
 104    }
 105
 106    /* XXX always enable shader? */
 107    if (1) {
 108       sp_push_quad_first( sp, sp->quad.shade );
 109    }
 110
 111    if (early_depth_test) {
 112       sp_build_depth_stencil( sp );
 113       sp_push_quad_first( sp, sp->quad.earlyz );
 114    }
 115
 116 #if !USE_DRAW_STAGE_PSTIPPLE
 117    if (sp->rasterizer->poly_stipple_enable) {
 118       sp_push_quad_first( sp, sp->quad.polygon_stipple );
 119    }
 120 #endif
 121 }