src/gallium/auxiliary/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_smooth && draw->pipeline.aaline) {
  62       draw->pipeline.aaline->next = next;
  63       next = draw->pipeline.aaline;
  64    }
  65
  66    if (draw->rasterizer->point_smooth && draw->pipeline.aapoint) {
  67       draw->pipeline.aapoint->next = next;
  68       next = draw->pipeline.aapoint;
  69    }
  70
  71    if ((draw->rasterizer->line_width != 1.0 && draw->convert_wide_lines
  72         && !draw->rasterizer->line_smooth) ||
  73        (draw->rasterizer->point_size != 1.0 && draw->convert_wide_points) ||
  74        draw->rasterizer->point_sprite) {
  75       draw->pipeline.wide->next = next;
  76       next = draw->pipeline.wide;
  77    }
  78
  79    if (draw->rasterizer->line_stipple_enable) {
  80       draw->pipeline.stipple->next = next;
  81       next = draw->pipeline.stipple;
  82       precalc_flat = 1;         /* only needed for lines really */
  83    }
  84
  85    if (draw->rasterizer->poly_stipple_enable
  86        && draw->pipeline.pstipple) {
  87       draw->pipeline.pstipple->next = next;
  88       next = draw->pipeline.pstipple;
  89    }
  90
  91    if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
  92        draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) {
  93       draw->pipeline.unfilled->next = next;
  94       next = draw->pipeline.unfilled;
  95       precalc_flat = 1;         /* only needed for triangles really */
  96       need_det = 1;
  97    }
  98
  99    if (draw->rasterizer->flatshade && precalc_flat) {
 100       draw->pipeline.flatshade->next = next;
 101       next = draw->pipeline.flatshade;
 102    }
 103
 104    if (draw->rasterizer->offset_cw ||
 105        draw->rasterizer->offset_ccw) {
 106       draw->pipeline.offset->next = next;
 107       next = draw->pipeline.offset;
 108       need_det = 1;
 109    }
 110
 111    if (draw->rasterizer->light_twoside) {
 112       draw->pipeline.twoside->next = next;
 113       next = draw->pipeline.twoside;
 114       need_det = 1;
 115    }
 116
 117    /* Always run the cull stage as we calculate determinant there
 118     * also.
 119     *
 120     * This can actually be a win as culling out the triangles can lead
 121     * to less work emitting vertices, smaller vertex buffers, etc.
 122     * It's difficult to say whether this will be true in general.
 123     */
 124    if (need_det || draw->rasterizer->cull_mode) {
 125       draw->pipeline.cull->next = next;
 126       next = draw->pipeline.cull;
 127    }
 128
 129    /* Clip stage
 130     */
 131    if (!draw->rasterizer->bypass_clipping)
 132    {
 133       draw->pipeline.clip->next = next;
 134       next = draw->pipeline.clip;
 135    }
 136
 137
 138    draw->pipeline.first = next;
 139    return next;
 140 }
 141
 142 static void validate_tri( struct draw_stage *stage,
 143                           struct prim_header *header )
 144 {
 145    struct draw_stage *pipeline = validate_pipeline( stage );
 146    pipeline->tri( pipeline, header );
 147 }
 148
 149 static void validate_line( struct draw_stage *stage,
 150                            struct prim_header *header )
 151 {
 152    struct draw_stage *pipeline = validate_pipeline( stage );
 153    pipeline->line( pipeline, header );
 154 }
 155
 156 static void validate_point( struct draw_stage *stage,
 157                             struct prim_header *header )
 158 {
 159    struct draw_stage *pipeline = validate_pipeline( stage );
 160    pipeline->point( pipeline, header );
 161 }
 162
 163 static void validate_reset_stipple_counter( struct draw_stage *stage )
 164 {
 165    struct draw_stage *pipeline = validate_pipeline( stage );
 166    pipeline->reset_stipple_counter( pipeline );
 167 }
 168
 169 static void validate_flush( struct draw_stage *stage,
 170                             unsigned flags )
 171 {
 172    /* May need to pass a backend flush on to the rasterize stage.
 173     */
 174    if (stage->next)
 175       stage->next->flush( stage->next, flags );
 176 }
 177
 178
 179 static void validate_destroy( struct draw_stage *stage )
 180 {
 181    FREE( stage );
 182 }
 183
 184
 185 /**
 186  * Create validate pipeline stage.
 187  */
 188 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 189 {
 190    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 191
 192    stage->draw = draw;
 193    stage->next = NULL;
 194    stage->point = validate_point;
 195    stage->line = validate_line;
 196    stage->tri = validate_tri;
 197    stage->flush = validate_flush;
 198    stage->reset_stipple_counter = validate_reset_stipple_counter;
 199    stage->destroy = validate_destroy;
 200
 201    return stage;
 202 }