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    boolean wide_lines, wide_points;
  49
  50    /* Set the validate's next stage to the rasterize stage, so that it
  51     * can be found later if needed for flushing.
  52     */
  53    stage->next = next;
  54
  55    /* drawing wide lines? */
  56    wide_lines = (draw->rasterizer->line_width > draw->wide_line_threshold
  57                  && !draw->rasterizer->line_smooth);
  58
  59    /* drawing large points? */
  60    if (draw->rasterizer->point_smooth && draw->pipeline.aapoint)
  61       wide_points = FALSE;
  62    else if (draw->rasterizer->point_size > draw->wide_point_threshold)
  63       wide_points = TRUE;
  64    else
  65       wide_points = FALSE;
  66
  67    /*
  68     * NOTE: we build up the pipeline in end-to-start order.
  69     *
  70     * TODO: make the current primitive part of the state and build
  71     * shorter pipelines for lines & points.
  72     */
  73
  74    if (draw->rasterizer->line_smooth && draw->pipeline.aaline) {
  75       draw->pipeline.aaline->next = next;
  76       next = draw->pipeline.aaline;
  77    }
  78
  79    if (draw->rasterizer->point_smooth && draw->pipeline.aapoint) {
  80       draw->pipeline.aapoint->next = next;
  81       next = draw->pipeline.aapoint;
  82    }
  83
  84    if (wide_lines) {
  85       draw->pipeline.wide_line->next = next;
  86       next = draw->pipeline.wide_line;
  87       precalc_flat = 1;
  88    }
  89
  90    if (wide_points || draw->rasterizer->point_sprite) {
  91       draw->pipeline.wide_point->next = next;
  92       next = draw->pipeline.wide_point;
  93    }
  94
  95    if (draw->rasterizer->line_stipple_enable) {
  96       draw->pipeline.stipple->next = next;
  97       next = draw->pipeline.stipple;
  98       precalc_flat = 1;         /* only needed for lines really */
  99    }
 100
 101    if (draw->rasterizer->poly_stipple_enable
 102        && draw->pipeline.pstipple) {
 103       draw->pipeline.pstipple->next = next;
 104       next = draw->pipeline.pstipple;
 105    }
 106
 107    if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 108        draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) {
 109       draw->pipeline.unfilled->next = next;
 110       next = draw->pipeline.unfilled;
 111       precalc_flat = 1;         /* only needed for triangles really */
 112       need_det = 1;
 113    }
 114
 115    if (draw->rasterizer->flatshade && precalc_flat) {
 116       draw->pipeline.flatshade->next = next;
 117       next = draw->pipeline.flatshade;
 118    }
 119
 120    if (draw->rasterizer->offset_cw ||
 121        draw->rasterizer->offset_ccw) {
 122       draw->pipeline.offset->next = next;
 123       next = draw->pipeline.offset;
 124       need_det = 1;
 125    }
 126
 127    if (draw->rasterizer->light_twoside) {
 128       draw->pipeline.twoside->next = next;
 129       next = draw->pipeline.twoside;
 130       need_det = 1;
 131    }
 132
 133    /* Always run the cull stage as we calculate determinant there
 134     * also.
 135     *
 136     * This can actually be a win as culling out the triangles can lead
 137     * to less work emitting vertices, smaller vertex buffers, etc.
 138     * It's difficult to say whether this will be true in general.
 139     */
 140    if (need_det || draw->rasterizer->cull_mode) {
 141       draw->pipeline.cull->next = next;
 142       next = draw->pipeline.cull;
 143    }
 144
 145    /* Clip stage
 146     */
 147    if (!draw->rasterizer->bypass_clipping)
 148    {
 149       draw->pipeline.clip->next = next;
 150       next = draw->pipeline.clip;
 151    }
 152
 153
 154    draw->pipeline.first = next;
 155    return next;
 156 }
 157
 158 static void validate_tri( struct draw_stage *stage,
 159                           struct prim_header *header )
 160 {
 161    struct draw_stage *pipeline = validate_pipeline( stage );
 162    pipeline->tri( pipeline, header );
 163 }
 164
 165 static void validate_line( struct draw_stage *stage,
 166                            struct prim_header *header )
 167 {
 168    struct draw_stage *pipeline = validate_pipeline( stage );
 169    pipeline->line( pipeline, header );
 170 }
 171
 172 static void validate_point( struct draw_stage *stage,
 173                             struct prim_header *header )
 174 {
 175    struct draw_stage *pipeline = validate_pipeline( stage );
 176    pipeline->point( pipeline, header );
 177 }
 178
 179 static void validate_reset_stipple_counter( struct draw_stage *stage )
 180 {
 181    struct draw_stage *pipeline = validate_pipeline( stage );
 182    pipeline->reset_stipple_counter( pipeline );
 183 }
 184
 185 static void validate_flush( struct draw_stage *stage,
 186                             unsigned flags )
 187 {
 188    /* May need to pass a backend flush on to the rasterize stage.
 189     */
 190    if (stage->next)
 191       stage->next->flush( stage->next, flags );
 192 }
 193
 194
 195 static void validate_destroy( struct draw_stage *stage )
 196 {
 197    FREE( stage );
 198 }
 199
 200
 201 /**
 202  * Create validate pipeline stage.
 203  */
 204 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 205 {
 206    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 207
 208    stage->draw = draw;
 209    stage->next = NULL;
 210    stage->point = validate_point;
 211    stage->line = validate_line;
 212    stage->tri = validate_tri;
 213    stage->flush = validate_flush;
 214    stage->reset_stipple_counter = validate_reset_stipple_counter;
 215    stage->destroy = validate_destroy;
 216
 217    return stage;
 218 }