src/gallium/auxiliary/draw/draw_pipe_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 "util/u_memory.h"
  32 #include "pipe/p_defines.h"
  33 #include "draw_private.h"
  34 #include "draw_pipe.h"
  35 #include "draw_context.h"
  36 #include "draw_vbuf.h"
  37
  38 static boolean points( unsigned prim )
  39 {
  40    return (prim == PIPE_PRIM_POINTS);
  41 }
  42
  43 static boolean lines( unsigned prim )
  44 {
  45    return (prim == PIPE_PRIM_LINES ||
  46            prim == PIPE_PRIM_LINE_STRIP ||
  47            prim == PIPE_PRIM_LINE_LOOP);
  48 }
  49
  50 static boolean triangles( unsigned prim )
  51 {
  52    return prim >= PIPE_PRIM_TRIANGLES;
  53 }
  54
  55 /**
  56  * Default version of a function to check if we need any special
  57  * pipeline stages, or whether prims/verts can go through untouched.
  58  * Don't test for bypass clipping or vs modes, this function is just
  59  * about the primitive pipeline stages.
  60  *
  61  * This can be overridden by the driver.
  62  */
  63 boolean
  64 draw_need_pipeline(const struct draw_context *draw,
  65                    const struct pipe_rasterizer_state *rasterizer,
  66                    unsigned int prim )
  67 {
  68    /* If the driver has overridden this, use that version:
  69     */
  70    if (draw->render &&
  71        draw->render->need_pipeline)
  72    {
  73       return draw->render->need_pipeline( draw->render,
  74                                           rasterizer,
  75                                           prim );
  76    }
  77
  78    /* Don't have to worry about triangles turning into lines/points
  79     * and triggering the pipeline, because we have to trigger the
  80     * pipeline *anyway* if unfilled mode is active.
  81     */
  82    if (lines(prim))
  83    {
  84       /* line stipple */
  85       if (rasterizer->line_stipple_enable && draw->pipeline.line_stipple)
  86          return TRUE;
  87
  88       /* wide lines */
  89       if (rasterizer->line_width > draw->pipeline.wide_line_threshold)
  90          return TRUE;
  91
  92       /* AA lines */
  93       if (rasterizer->line_smooth && draw->pipeline.aaline)
  94          return TRUE;
  95    }
  96
  97    if (points(prim))
  98    {
  99       /* large points */
 100       if (rasterizer->point_size > draw->pipeline.wide_point_threshold)
 101          return TRUE;
 102
 103       /* sprite points */
 104       if (rasterizer->point_quad_rasterization
 105           && draw->pipeline.wide_point_sprites)
 106          return TRUE;
 107
 108       /* AA points */
 109       if (rasterizer->point_smooth && draw->pipeline.aapoint)
 110          return TRUE;
 111
 112       /* point sprites */
 113       if (rasterizer->sprite_coord_enable && draw->pipeline.point_sprite)
 114          return TRUE;
 115    }
 116
 117
 118    if (triangles(prim))
 119    {
 120       /* polygon stipple */
 121       if (rasterizer->poly_stipple_enable && draw->pipeline.pstipple)
 122          return TRUE;
 123
 124       /* unfilled polygons */
 125       if (rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 126           rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL)
 127          return TRUE;
 128
 129       /* polygon offset */
 130       if (rasterizer->offset_cw || rasterizer->offset_ccw)
 131          return TRUE;
 132
 133       /* two-side lighting */
 134       if (rasterizer->light_twoside)
 135          return TRUE;
 136    }
 137
 138    /* polygon cull - this is difficult - hardware can cull just fine
 139     * most of the time (though sometimes CULL_NEITHER is unsupported.
 140     *
 141     * Generally this isn't a reason to require the pipeline, though.
 142     *
 143    if (rasterizer->cull_mode)
 144       return TRUE;
 145     */
 146
 147    return FALSE;
 148 }
 149
 150
 151
 152 /**
 153  * Rebuild the rendering pipeline.
 154  */
 155 static struct draw_stage *validate_pipeline( struct draw_stage *stage )
 156 {
 157    struct draw_context *draw = stage->draw;
 158    struct draw_stage *next = draw->pipeline.rasterize;
 159    boolean need_det = FALSE;
 160    boolean precalc_flat = FALSE;
 161    boolean wide_lines, wide_points;
 162    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 163
 164    /* Set the validate's next stage to the rasterize stage, so that it
 165     * can be found later if needed for flushing.
 166     */
 167    stage->next = next;
 168
 169    /* drawing wide lines? */
 170    wide_lines = (rast->line_width > draw->pipeline.wide_line_threshold
 171                  && !rast->line_smooth);
 172
 173    /* drawing large points? */
 174    if (rast->sprite_coord_enable && draw->pipeline.point_sprite)
 175       wide_points = TRUE;
 176    else if (rast->point_smooth && draw->pipeline.aapoint)
 177       wide_points = FALSE;
 178    else if (rast->point_size > draw->pipeline.wide_point_threshold)
 179       wide_points = TRUE;
 180    else if (rast->point_quad_rasterization && draw->pipeline.wide_point_sprites)
 181       wide_points = TRUE;
 182    else
 183       wide_points = FALSE;
 184
 185    /*
 186     * NOTE: we build up the pipeline in end-to-start order.
 187     *
 188     * TODO: make the current primitive part of the state and build
 189     * shorter pipelines for lines & points.
 190     */
 191
 192    if (rast->line_smooth && draw->pipeline.aaline) {
 193       draw->pipeline.aaline->next = next;
 194       next = draw->pipeline.aaline;
 195    }
 196
 197    if (rast->point_smooth && draw->pipeline.aapoint) {
 198       draw->pipeline.aapoint->next = next;
 199       next = draw->pipeline.aapoint;
 200    }
 201
 202    if (wide_lines) {
 203       draw->pipeline.wide_line->next = next;
 204       next = draw->pipeline.wide_line;
 205       precalc_flat = TRUE;
 206    }
 207
 208    if (wide_points || rast->sprite_coord_enable) {
 209       draw->pipeline.wide_point->next = next;
 210       next = draw->pipeline.wide_point;
 211    }
 212
 213    if (rast->line_stipple_enable && draw->pipeline.line_stipple) {
 214       draw->pipeline.stipple->next = next;
 215       next = draw->pipeline.stipple;
 216       precalc_flat = TRUE;              /* only needed for lines really */
 217    }
 218
 219    if (rast->poly_stipple_enable
 220        && draw->pipeline.pstipple) {
 221       draw->pipeline.pstipple->next = next;
 222       next = draw->pipeline.pstipple;
 223    }
 224
 225    if (rast->fill_cw != PIPE_POLYGON_MODE_FILL ||
 226        rast->fill_ccw != PIPE_POLYGON_MODE_FILL) {
 227       draw->pipeline.unfilled->next = next;
 228       next = draw->pipeline.unfilled;
 229       precalc_flat = TRUE;              /* only needed for triangles really */
 230       need_det = TRUE;
 231    }
 232
 233    if (rast->flatshade && precalc_flat) {
 234       draw->pipeline.flatshade->next = next;
 235       next = draw->pipeline.flatshade;
 236    }
 237
 238    if (rast->offset_cw ||
 239        rast->offset_ccw) {
 240       draw->pipeline.offset->next = next;
 241       next = draw->pipeline.offset;
 242       need_det = TRUE;
 243    }
 244
 245    if (rast->light_twoside) {
 246       draw->pipeline.twoside->next = next;
 247       next = draw->pipeline.twoside;
 248       need_det = TRUE;
 249    }
 250
 251    /* Always run the cull stage as we calculate determinant there
 252     * also.
 253     *
 254     * This can actually be a win as culling out the triangles can lead
 255     * to less work emitting vertices, smaller vertex buffers, etc.
 256     * It's difficult to say whether this will be true in general.
 257     */
 258    if (need_det || rast->cull_mode) {
 259       draw->pipeline.cull->next = next;
 260       next = draw->pipeline.cull;
 261    }
 262
 263    /* Clip stage
 264     */
 265    if (!draw->bypass_clipping)
 266    {
 267       draw->pipeline.clip->next = next;
 268       next = draw->pipeline.clip;
 269    }
 270
 271
 272    draw->pipeline.first = next;
 273
 274    if (0) {
 275       debug_printf("draw pipeline:\n");
 276       for (next = draw->pipeline.first; next ; next = next->next )
 277          debug_printf("   %s\n", next->name);
 278       debug_printf("\n");
 279    }
 280
 281    return draw->pipeline.first;
 282 }
 283
 284 static void validate_tri( struct draw_stage *stage,
 285                           struct prim_header *header )
 286 {
 287    struct draw_stage *pipeline = validate_pipeline( stage );
 288    pipeline->tri( pipeline, header );
 289 }
 290
 291 static void validate_line( struct draw_stage *stage,
 292                            struct prim_header *header )
 293 {
 294    struct draw_stage *pipeline = validate_pipeline( stage );
 295    pipeline->line( pipeline, header );
 296 }
 297
 298 static void validate_point( struct draw_stage *stage,
 299                             struct prim_header *header )
 300 {
 301    struct draw_stage *pipeline = validate_pipeline( stage );
 302    pipeline->point( pipeline, header );
 303 }
 304
 305 static void validate_reset_stipple_counter( struct draw_stage *stage )
 306 {
 307    struct draw_stage *pipeline = validate_pipeline( stage );
 308    pipeline->reset_stipple_counter( pipeline );
 309 }
 310
 311 static void validate_flush( struct draw_stage *stage,
 312                             unsigned flags )
 313 {
 314    /* May need to pass a backend flush on to the rasterize stage.
 315     */
 316    if (stage->next)
 317       stage->next->flush( stage->next, flags );
 318 }
 319
 320
 321 static void validate_destroy( struct draw_stage *stage )
 322 {
 323    FREE( stage );
 324 }
 325
 326
 327 /**
 328  * Create validate pipeline stage.
 329  */
 330 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 331 {
 332    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 333    if (stage == NULL)
 334       return NULL;
 335
 336    stage->draw = draw;
 337    stage->name = "validate";
 338    stage->next = NULL;
 339    stage->point = validate_point;
 340    stage->line = validate_line;
 341    stage->tri = validate_tri;
 342    stage->flush = validate_flush;
 343    stage->reset_stipple_counter = validate_reset_stipple_counter;
 344    stage->destroy = validate_destroy;
 345
 346    return stage;
 347 }