src/gallium/auxiliary/draw/draw_pipe_validate.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
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   7  * copy of this software and associated documentation files (the
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  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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Authors:  Keith Whitwell <keithw@vmware.com>
  29  */
  30
  31 #include "util/u_memory.h"
  32 #include "util/u_math.h"
  33 #include "util/u_prim.h"
  34 #include "pipe/p_defines.h"
  35 #include "draw_private.h"
  36 #include "draw_pipe.h"
  37 #include "draw_context.h"
  38 #include "draw_vbuf.h"
  39
  40
  41 /**
  42  * Default version of a function to check if we need any special
  43  * pipeline stages, or whether prims/verts can go through untouched.
  44  * Don't test for bypass clipping or vs modes, this function is just
  45  * about the primitive pipeline stages.
  46  *
  47  * This can be overridden by the driver.
  48  */
  49 boolean
  50 draw_need_pipeline(const struct draw_context *draw,
  51                    const struct pipe_rasterizer_state *rasterizer,
  52                    unsigned int prim )
  53 {
  54    unsigned reduced_prim = u_reduced_prim(prim);
  55
  56    /* If the driver has overridden this, use that version:
  57     */
  58    if (draw->render &&
  59        draw->render->need_pipeline)
  60    {
  61       return draw->render->need_pipeline( draw->render,
  62                                           rasterizer,
  63                                           prim );
  64    }
  65
  66    /* Don't have to worry about triangles turning into lines/points
  67     * and triggering the pipeline, because we have to trigger the
  68     * pipeline *anyway* if unfilled mode is active.
  69     */
  70    if (reduced_prim == PIPE_PRIM_LINES) {
  71       /* line stipple */
  72       if (rasterizer->line_stipple_enable && draw->pipeline.line_stipple)
  73          return TRUE;
  74
  75       /* wide lines */
  76       if (roundf(rasterizer->line_width) > draw->pipeline.wide_line_threshold)
  77          return TRUE;
  78
  79       /* AA lines */
  80       if ((!rasterizer->multisample && rasterizer->line_smooth) && draw->pipeline.aaline)
  81          return TRUE;
  82
  83       if (draw_current_shader_num_written_culldistances(draw))
  84          return TRUE;
  85    }
  86    else if (reduced_prim == PIPE_PRIM_POINTS) {
  87       /* large points */
  88       if (rasterizer->point_size > draw->pipeline.wide_point_threshold)
  89          return TRUE;
  90
  91       /* sprite points */
  92       if (rasterizer->point_quad_rasterization
  93           && draw->pipeline.wide_point_sprites)
  94          return TRUE;
  95
  96       /* AA points */
  97       if ((!rasterizer->multisample && rasterizer->point_smooth) && draw->pipeline.aapoint)
  98          return TRUE;
  99
 100       /* point sprites */
 101       if (rasterizer->sprite_coord_enable && draw->pipeline.point_sprite)
 102          return TRUE;
 103
 104       if (draw_current_shader_num_written_culldistances(draw))
 105          return TRUE;
 106    }
 107    else if (reduced_prim == PIPE_PRIM_TRIANGLES) {
 108       /* polygon stipple */
 109       if (rasterizer->poly_stipple_enable && draw->pipeline.pstipple)
 110          return TRUE;
 111
 112       /* unfilled polygons */
 113       if (rasterizer->fill_front != PIPE_POLYGON_MODE_FILL ||
 114           rasterizer->fill_back != PIPE_POLYGON_MODE_FILL)
 115          return TRUE;
 116
 117       /* polygon offset */
 118       if (rasterizer->offset_point ||
 119           rasterizer->offset_line ||
 120           rasterizer->offset_tri)
 121          return TRUE;
 122
 123       /* two-side lighting */
 124       if (rasterizer->light_twoside)
 125          return TRUE;
 126
 127       if (draw_current_shader_num_written_culldistances(draw))
 128          return TRUE;
 129    }
 130
 131    /* polygon cull - this is difficult - hardware can cull just fine
 132     * most of the time (though sometimes CULL_NEITHER is unsupported.
 133     *
 134     * Generally this isn't a reason to require the pipeline, though.
 135     *
 136    if (rasterizer->cull_mode)
 137       return TRUE;
 138    */
 139
 140    return FALSE;
 141 }
 142
 143
 144
 145 /**
 146  * Rebuild the rendering pipeline.
 147  */
 148 static struct draw_stage *validate_pipeline( struct draw_stage *stage )
 149 {
 150    struct draw_context *draw = stage->draw;
 151    struct draw_stage *next = draw->pipeline.rasterize;
 152    boolean need_det = FALSE;
 153    boolean precalc_flat = FALSE;
 154    boolean wide_lines, wide_points;
 155    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 156
 157    /* Set the validate's next stage to the rasterize stage, so that it
 158     * can be found later if needed for flushing.
 159     */
 160    stage->next = next;
 161
 162    /* drawing wide, non-AA lines? */
 163    wide_lines = rast->line_width != 1.0f &&
 164                 roundf(rast->line_width) > draw->pipeline.wide_line_threshold &&
 165                 (!rast->line_smooth || rast->multisample);
 166
 167    /* drawing large/sprite points (but not AA points)? */
 168    if (rast->sprite_coord_enable && draw->pipeline.point_sprite)
 169       wide_points = TRUE;
 170    else if ((!rast->multisample && rast->point_smooth) && draw->pipeline.aapoint)
 171       wide_points = FALSE;
 172    else if (rast->point_size > draw->pipeline.wide_point_threshold)
 173       wide_points = TRUE;
 174    else if (rast->point_quad_rasterization && draw->pipeline.wide_point_sprites)
 175       wide_points = TRUE;
 176    else
 177       wide_points = FALSE;
 178
 179    /*
 180     * NOTE: we build up the pipeline in end-to-start order.
 181     *
 182     * TODO: make the current primitive part of the state and build
 183     * shorter pipelines for lines & points.
 184     */
 185
 186    if ((!rast->multisample && rast->line_smooth) && draw->pipeline.aaline) {
 187       draw->pipeline.aaline->next = next;
 188       next = draw->pipeline.aaline;
 189       precalc_flat = TRUE;
 190    }
 191
 192    if ((!rast->multisample && rast->point_smooth) && draw->pipeline.aapoint) {
 193       draw->pipeline.aapoint->next = next;
 194       next = draw->pipeline.aapoint;
 195    }
 196
 197    if (wide_lines) {
 198       draw->pipeline.wide_line->next = next;
 199       next = draw->pipeline.wide_line;
 200       precalc_flat = TRUE;
 201    }
 202
 203    if (wide_points) {
 204       draw->pipeline.wide_point->next = next;
 205       next = draw->pipeline.wide_point;
 206    }
 207
 208    if (rast->line_stipple_enable && draw->pipeline.line_stipple) {
 209       draw->pipeline.stipple->next = next;
 210       next = draw->pipeline.stipple;
 211       precalc_flat = TRUE;              /* only needed for lines really */
 212    }
 213
 214    if (rast->poly_stipple_enable
 215        && draw->pipeline.pstipple) {
 216       draw->pipeline.pstipple->next = next;
 217       next = draw->pipeline.pstipple;
 218    }
 219
 220    if (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
 221        rast->fill_back != PIPE_POLYGON_MODE_FILL) {
 222       draw->pipeline.unfilled->next = next;
 223       next = draw->pipeline.unfilled;
 224       precalc_flat = TRUE;              /* only needed for triangles really */
 225       need_det = TRUE;
 226    }
 227
 228    if (precalc_flat) {
 229       /*
 230        * could only run the stage if either rast->flatshade is true
 231        * or there's constant interpolated values.
 232        */
 233       draw->pipeline.flatshade->next = next;
 234       next = draw->pipeline.flatshade;
 235    }
 236
 237    if (rast->offset_point ||
 238        rast->offset_line ||
 239        rast->offset_tri) {
 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_face != PIPE_FACE_NONE) {
 259       draw->pipeline.cull->next = next;
 260       next = draw->pipeline.cull;
 261    }
 262
 263    /* Clip stage
 264     */
 265    if (draw->clip_xy || draw->clip_z || draw->clip_user)
 266    {
 267       draw->pipeline.clip->next = next;
 268       next = draw->pipeline.clip;
 269    }
 270
 271    if (draw_current_shader_num_written_culldistances(draw)) {
 272       draw->pipeline.user_cull->next = next;
 273       next = draw->pipeline.user_cull;
 274    }
 275
 276    draw->pipeline.first = next;
 277
 278    if (0) {
 279       debug_printf("draw pipeline:\n");
 280       for (next = draw->pipeline.first; next ; next = next->next )
 281          debug_printf("   %s\n", next->name);
 282       debug_printf("\n");
 283    }
 284
 285    return draw->pipeline.first;
 286 }
 287
 288 static void validate_tri( struct draw_stage *stage,
 289                           struct prim_header *header )
 290 {
 291    struct draw_stage *pipeline = validate_pipeline( stage );
 292    pipeline->tri( pipeline, header );
 293 }
 294
 295 static void validate_line( struct draw_stage *stage,
 296                            struct prim_header *header )
 297 {
 298    struct draw_stage *pipeline = validate_pipeline( stage );
 299    pipeline->line( pipeline, header );
 300 }
 301
 302 static void validate_point( struct draw_stage *stage,
 303                             struct prim_header *header )
 304 {
 305    struct draw_stage *pipeline = validate_pipeline( stage );
 306    pipeline->point( pipeline, header );
 307 }
 308
 309 static void validate_reset_stipple_counter( struct draw_stage *stage )
 310 {
 311    struct draw_stage *pipeline = validate_pipeline( stage );
 312    pipeline->reset_stipple_counter( pipeline );
 313 }
 314
 315 static void validate_flush( struct draw_stage *stage,
 316                             unsigned flags )
 317 {
 318    /* May need to pass a backend flush on to the rasterize stage.
 319     */
 320    if (stage->next)
 321       stage->next->flush( stage->next, flags );
 322 }
 323
 324
 325 static void validate_destroy( struct draw_stage *stage )
 326 {
 327    FREE( stage );
 328 }
 329
 330
 331 /**
 332  * Create validate pipeline stage.
 333  */
 334 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 335 {
 336    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 337    if (!stage)
 338       return NULL;
 339
 340    stage->draw = draw;
 341    stage->name = "validate";
 342    stage->next = NULL;
 343    stage->point = validate_point;
 344    stage->line = validate_line;
 345    stage->tri = validate_tri;
 346    stage->flush = validate_flush;
 347    stage->reset_stipple_counter = validate_reset_stipple_counter;
 348    stage->destroy = validate_destroy;
 349
 350    return stage;
 351 }