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    }
  88
  89    if (wide_points || draw->rasterizer->point_sprite) {
  90       draw->pipeline.wide_point->next = next;
  91       next = draw->pipeline.wide_point;
  92    }
  93
  94    if (draw->rasterizer->line_stipple_enable) {
  95       draw->pipeline.stipple->next = next;
  96       next = draw->pipeline.stipple;
  97       precalc_flat = 1;         /* only needed for lines really */
  98    }
  99
 100    if (draw->rasterizer->poly_stipple_enable
 101        && draw->pipeline.pstipple) {
 102       draw->pipeline.pstipple->next = next;
 103       next = draw->pipeline.pstipple;
 104    }
 105
 106    if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 107        draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL) {
 108       draw->pipeline.unfilled->next = next;
 109       next = draw->pipeline.unfilled;
 110       precalc_flat = 1;         /* only needed for triangles really */
 111       need_det = 1;
 112    }
 113
 114    if (draw->rasterizer->flatshade && precalc_flat) {
 115       draw->pipeline.flatshade->next = next;
 116       next = draw->pipeline.flatshade;
 117    }
 118
 119    if (draw->rasterizer->offset_cw ||
 120        draw->rasterizer->offset_ccw) {
 121       draw->pipeline.offset->next = next;
 122       next = draw->pipeline.offset;
 123       need_det = 1;
 124    }
 125
 126    if (draw->rasterizer->light_twoside) {
 127       draw->pipeline.twoside->next = next;
 128       next = draw->pipeline.twoside;
 129       need_det = 1;
 130    }
 131
 132    /* Always run the cull stage as we calculate determinant there
 133     * also.
 134     *
 135     * This can actually be a win as culling out the triangles can lead
 136     * to less work emitting vertices, smaller vertex buffers, etc.
 137     * It's difficult to say whether this will be true in general.
 138     */
 139    if (need_det || draw->rasterizer->cull_mode) {
 140       draw->pipeline.cull->next = next;
 141       next = draw->pipeline.cull;
 142    }
 143
 144    /* Clip stage
 145     */
 146    if (!draw->rasterizer->bypass_clipping)
 147    {
 148       draw->pipeline.clip->next = next;
 149       next = draw->pipeline.clip;
 150    }
 151
 152
 153    draw->pipeline.first = next;
 154    return next;
 155 }
 156
 157 static void validate_tri( struct draw_stage *stage,
 158                           struct prim_header *header )
 159 {
 160    struct draw_stage *pipeline = validate_pipeline( stage );
 161    pipeline->tri( pipeline, header );
 162 }
 163
 164 static void validate_line( struct draw_stage *stage,
 165                            struct prim_header *header )
 166 {
 167    struct draw_stage *pipeline = validate_pipeline( stage );
 168    pipeline->line( pipeline, header );
 169 }
 170
 171 static void validate_point( struct draw_stage *stage,
 172                             struct prim_header *header )
 173 {
 174    struct draw_stage *pipeline = validate_pipeline( stage );
 175    pipeline->point( pipeline, header );
 176 }
 177
 178 static void validate_reset_stipple_counter( struct draw_stage *stage )
 179 {
 180    struct draw_stage *pipeline = validate_pipeline( stage );
 181    pipeline->reset_stipple_counter( pipeline );
 182 }
 183
 184 static void validate_flush( struct draw_stage *stage,
 185                             unsigned flags )
 186 {
 187    /* May need to pass a backend flush on to the rasterize stage.
 188     */
 189    if (stage->next)
 190       stage->next->flush( stage->next, flags );
 191 }
 192
 193
 194 static void validate_destroy( struct draw_stage *stage )
 195 {
 196    FREE( stage );
 197 }
 198
 199
 200 /**
 201  * Create validate pipeline stage.
 202  */
 203 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 204 {
 205    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 206
 207    stage->draw = draw;
 208    stage->next = NULL;
 209    stage->point = validate_point;
 210    stage->line = validate_line;
 211    stage->tri = validate_tri;
 212    stage->flush = validate_flush;
 213    stage->reset_stipple_counter = validate_reset_stipple_counter;
 214    stage->destroy = validate_destroy;
 215
 216    return stage;
 217 }