src/gallium/aux/draw/draw_validate.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 /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29  */
  30
  31 #include "pipe/p_util.h"
  32 #include "pipe/p_defines.h"
  33 #include "draw_private.h"
  34
  35
  36
  37
  38
  39 /**
  40  * Rebuild the rendering pipeline.
  41  */
  42 static struct draw_stage *validate_pipeline( struct draw_stage *stage )
  43 {
  44    struct draw_context *draw = stage->draw;
  45    struct draw_stage *next = draw->pipeline.rasterize;
  46    int need_det = 0;
  47    int precalc_flat = 0;
  48
  49    /* Set the validate's next stage to the rasterize stage, so that it
  50     * can be found later if needed for flushing.
  51     */
  52    stage->next = next;
  53
  54    /*
  55     * NOTE: we build up the pipeline in end-to-start order.
  56     *
  57     * TODO: make the current primitive part of the state and build
  58     * shorter pipelines for lines & points.
  59     */
  60
  61    if ((draw->rasterizer->line_width != 1.0 && draw->convert_wide_lines) ||
  62        (draw->rasterizer->point_size != 1.0 && draw->convert_wide_points) ||
  63        draw->rasterizer->point_sprite) {
  64       draw->pipeline.wide->next = next;
  65       next = draw->pipeline.wide;
  66    }
  67
  68    if (draw->rasterizer->line_stipple_enable) {
  69       draw->pipeline.stipple->next = next;
  70       next = draw->pipeline.stipple;
  71       precalc_flat = 1;         /* only needed for lines really */
  72    }
  73
  74    if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
  75        draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) {
  76       draw->pipeline.unfilled->next = next;
  77       next = draw->pipeline.unfilled;
  78       precalc_flat = 1;         /* only needed for triangles really */
  79       need_det = 1;
  80    }
  81
  82    if (draw->rasterizer->flatshade && precalc_flat) {
  83       draw->pipeline.flatshade->next = next;
  84       next = draw->pipeline.flatshade;
  85    }
  86
  87    if (draw->rasterizer->offset_cw ||
  88        draw->rasterizer->offset_ccw) {
  89       draw->pipeline.offset->next = next;
  90       next = draw->pipeline.offset;
  91       need_det = 1;
  92    }
  93
  94    if (draw->rasterizer->light_twoside) {
  95       draw->pipeline.twoside->next = next;
  96       next = draw->pipeline.twoside;
  97       need_det = 1;
  98    }
  99
 100    /* Always run the cull stage as we calculate determinant there
 101     * also.
 102     *
 103     * This can actually be a win as culling out the triangles can lead
 104     * to less work emitting vertices, smaller vertex buffers, etc.
 105     * It's difficult to say whether this will be true in general.
 106     */
 107    if (need_det || draw->rasterizer->cull_mode) {
 108       draw->pipeline.cull->next = next;
 109       next = draw->pipeline.cull;
 110    }
 111
 112    /* Clip stage
 113     */
 114    if (!draw->rasterizer->bypass_clipping)
 115    {
 116       draw->pipeline.clip->next = next;
 117       next = draw->pipeline.clip;
 118    }
 119
 120
 121    draw->pipeline.first = next;
 122    return next;
 123 }
 124
 125 static void validate_tri( struct draw_stage *stage,
 126                           struct prim_header *header )
 127 {
 128    struct draw_stage *pipeline = validate_pipeline( stage );
 129    pipeline->tri( pipeline, header );
 130 }
 131
 132 static void validate_line( struct draw_stage *stage,
 133                            struct prim_header *header )
 134 {
 135    struct draw_stage *pipeline = validate_pipeline( stage );
 136    pipeline->line( pipeline, header );
 137 }
 138
 139 static void validate_point( struct draw_stage *stage,
 140                             struct prim_header *header )
 141 {
 142    struct draw_stage *pipeline = validate_pipeline( stage );
 143    pipeline->point( pipeline, header );
 144 }
 145
 146 static void validate_reset_stipple_counter( struct draw_stage *stage )
 147 {
 148    struct draw_stage *pipeline = validate_pipeline( stage );
 149    pipeline->reset_stipple_counter( pipeline );
 150 }
 151
 152 static void validate_flush( struct draw_stage *stage,
 153                             unsigned flags )
 154 {
 155    /* May need to pass a backend flush on to the rasterize stage.
 156     */
 157    if (stage->next)
 158       stage->next->flush( stage->next, flags );
 159 }
 160
 161
 162 static void validate_destroy( struct draw_stage *stage )
 163 {
 164    FREE( stage );
 165 }
 166
 167
 168 /**
 169  * Create validate pipeline stage.
 170  */
 171 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 172 {
 173    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 174
 175    stage->draw = draw;
 176    stage->next = NULL;
 177    stage->point = validate_point;
 178    stage->line = validate_line;
 179    stage->tri = validate_tri;
 180    stage->flush = validate_flush;
 181    stage->reset_stipple_counter = validate_reset_stipple_counter;
 182    stage->destroy = validate_destroy;
 183
 184    return stage;
 185 }