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    /*
  56     * NOTE: we build up the pipeline in end-to-start order.
  57     *
  58     * TODO: make the current primitive part of the state and build
  59     * shorter pipelines for lines & points.
  60     */
  61
  62    if (draw->rasterizer->line_smooth && draw->pipeline.aaline) {
  63       draw->pipeline.aaline->next = next;
  64       next = draw->pipeline.aaline;
  65    }
  66
  67    if (draw->rasterizer->point_smooth && draw->pipeline.aapoint) {
  68       draw->pipeline.aapoint->next = next;
  69       next = draw->pipeline.aapoint;
  70    }
  71
  72    /* drawing wide lines? */
  73    wide_lines = (draw->rasterizer->line_width != 1.0
  74                  && draw->convert_wide_lines
  75                  && !draw->rasterizer->line_smooth);
  76
  77    /* drawing large points? */
  78    wide_points = (draw->rasterizer->point_size != 1.0
  79                   && draw->convert_wide_points
  80                   && !draw->pipeline.aapoint);
  81
  82    if (wide_lines ||
  83        wide_points ||
  84        draw->rasterizer->point_sprite) {
  85       draw->pipeline.wide->next = next;
  86       next = draw->pipeline.wide;
  87    }
  88
  89    if (draw->rasterizer->line_stipple_enable) {
  90       draw->pipeline.stipple->next = next;
  91       next = draw->pipeline.stipple;
  92       precalc_flat = 1;         /* only needed for lines really */
  93    }
  94
  95    if (draw->rasterizer->poly_stipple_enable
  96        && draw->pipeline.pstipple) {
  97       draw->pipeline.pstipple->next = next;
  98       next = draw->pipeline.pstipple;
  99    }
 100
 101    if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 102        draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) {
 103       draw->pipeline.unfilled->next = next;
 104       next = draw->pipeline.unfilled;
 105       precalc_flat = 1;         /* only needed for triangles really */
 106       need_det = 1;
 107    }
 108
 109    if (draw->rasterizer->flatshade && precalc_flat) {
 110       draw->pipeline.flatshade->next = next;
 111       next = draw->pipeline.flatshade;
 112    }
 113
 114    if (draw->rasterizer->offset_cw ||
 115        draw->rasterizer->offset_ccw) {
 116       draw->pipeline.offset->next = next;
 117       next = draw->pipeline.offset;
 118       need_det = 1;
 119    }
 120
 121    if (draw->rasterizer->light_twoside) {
 122       draw->pipeline.twoside->next = next;
 123       next = draw->pipeline.twoside;
 124       need_det = 1;
 125    }
 126
 127    /* Always run the cull stage as we calculate determinant there
 128     * also.
 129     *
 130     * This can actually be a win as culling out the triangles can lead
 131     * to less work emitting vertices, smaller vertex buffers, etc.
 132     * It's difficult to say whether this will be true in general.
 133     */
 134    if (need_det || draw->rasterizer->cull_mode) {
 135       draw->pipeline.cull->next = next;
 136       next = draw->pipeline.cull;
 137    }
 138
 139    /* Clip stage
 140     */
 141    if (!draw->rasterizer->bypass_clipping)
 142    {
 143       draw->pipeline.clip->next = next;
 144       next = draw->pipeline.clip;
 145    }
 146
 147
 148    draw->pipeline.first = next;
 149    return next;
 150 }
 151
 152 static void validate_tri( struct draw_stage *stage,
 153                           struct prim_header *header )
 154 {
 155    struct draw_stage *pipeline = validate_pipeline( stage );
 156    pipeline->tri( pipeline, header );
 157 }
 158
 159 static void validate_line( struct draw_stage *stage,
 160                            struct prim_header *header )
 161 {
 162    struct draw_stage *pipeline = validate_pipeline( stage );
 163    pipeline->line( pipeline, header );
 164 }
 165
 166 static void validate_point( struct draw_stage *stage,
 167                             struct prim_header *header )
 168 {
 169    struct draw_stage *pipeline = validate_pipeline( stage );
 170    pipeline->point( pipeline, header );
 171 }
 172
 173 static void validate_reset_stipple_counter( struct draw_stage *stage )
 174 {
 175    struct draw_stage *pipeline = validate_pipeline( stage );
 176    pipeline->reset_stipple_counter( pipeline );
 177 }
 178
 179 static void validate_flush( struct draw_stage *stage,
 180                             unsigned flags )
 181 {
 182    /* May need to pass a backend flush on to the rasterize stage.
 183     */
 184    if (stage->next)
 185       stage->next->flush( stage->next, flags );
 186 }
 187
 188
 189 static void validate_destroy( struct draw_stage *stage )
 190 {
 191    FREE( stage );
 192 }
 193
 194
 195 /**
 196  * Create validate pipeline stage.
 197  */
 198 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 199 {
 200    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 201
 202    stage->draw = draw;
 203    stage->next = NULL;
 204    stage->point = validate_point;
 205    stage->line = validate_line;
 206    stage->tri = validate_tri;
 207    stage->flush = validate_flush;
 208    stage->reset_stipple_counter = validate_reset_stipple_counter;
 209    stage->destroy = validate_destroy;
 210
 211    return stage;
 212 }