src/gallium/auxiliary/draw/draw_pipe_validate.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  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->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->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    else if (reduced_prim == PIPE_PRIM_TRIANGLES) {
 105       /* polygon stipple */
 106       if (rasterizer->poly_stipple_enable && draw->pipeline.pstipple)
 107          return TRUE;
 108
 109       /* unfilled polygons */
 110       if (rasterizer->fill_front != PIPE_POLYGON_MODE_FILL ||
 111           rasterizer->fill_back != PIPE_POLYGON_MODE_FILL)
 112          return TRUE;
 113
 114       /* polygon offset */
 115       if (rasterizer->offset_point ||
 116           rasterizer->offset_line ||
 117           rasterizer->offset_tri)
 118          return TRUE;
 119
 120       /* two-side lighting */
 121       if (rasterizer->light_twoside)
 122          return TRUE;
 123
 124       if (draw_current_shader_num_written_culldistances(draw))
 125          return TRUE;
 126    }
 127
 128    /* polygon cull - this is difficult - hardware can cull just fine
 129     * most of the time (though sometimes CULL_NEITHER is unsupported.
 130     *
 131     * Generally this isn't a reason to require the pipeline, though.
 132     *
 133    if (rasterizer->cull_mode)
 134       return TRUE;
 135    */
 136
 137    return FALSE;
 138 }
 139
 140
 141
 142 /**
 143  * Rebuild the rendering pipeline.
 144  */
 145 static struct draw_stage *validate_pipeline( struct draw_stage *stage )
 146 {
 147    struct draw_context *draw = stage->draw;
 148    struct draw_stage *next = draw->pipeline.rasterize;
 149    boolean need_det = FALSE;
 150    boolean precalc_flat = FALSE;
 151    boolean wide_lines, wide_points;
 152    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 153
 154    /* Set the validate's next stage to the rasterize stage, so that it
 155     * can be found later if needed for flushing.
 156     */
 157    stage->next = next;
 158
 159    /* drawing wide lines? */
 160    wide_lines = (roundf(rast->line_width) > draw->pipeline.wide_line_threshold
 161                  && !rast->line_smooth);
 162
 163    /* drawing large/sprite points (but not AA points)? */
 164    if (rast->sprite_coord_enable && draw->pipeline.point_sprite)
 165       wide_points = TRUE;
 166    else if (rast->point_smooth && draw->pipeline.aapoint)
 167       wide_points = FALSE;
 168    else if (rast->point_size > draw->pipeline.wide_point_threshold)
 169       wide_points = TRUE;
 170    else if (rast->point_quad_rasterization && draw->pipeline.wide_point_sprites)
 171       wide_points = TRUE;
 172    else
 173       wide_points = FALSE;
 174
 175    /*
 176     * NOTE: we build up the pipeline in end-to-start order.
 177     *
 178     * TODO: make the current primitive part of the state and build
 179     * shorter pipelines for lines & points.
 180     */
 181
 182    if (rast->line_smooth && draw->pipeline.aaline) {
 183       draw->pipeline.aaline->next = next;
 184       next = draw->pipeline.aaline;
 185       precalc_flat = TRUE;
 186    }
 187
 188    if (rast->point_smooth && draw->pipeline.aapoint) {
 189       draw->pipeline.aapoint->next = next;
 190       next = draw->pipeline.aapoint;
 191    }
 192
 193    if (wide_lines) {
 194       draw->pipeline.wide_line->next = next;
 195       next = draw->pipeline.wide_line;
 196       precalc_flat = TRUE;
 197    }
 198
 199    if (wide_points) {
 200       draw->pipeline.wide_point->next = next;
 201       next = draw->pipeline.wide_point;
 202    }
 203
 204    if (rast->line_stipple_enable && draw->pipeline.line_stipple) {
 205       draw->pipeline.stipple->next = next;
 206       next = draw->pipeline.stipple;
 207       precalc_flat = TRUE;              /* only needed for lines really */
 208    }
 209
 210    if (rast->poly_stipple_enable
 211        && draw->pipeline.pstipple) {
 212       draw->pipeline.pstipple->next = next;
 213       next = draw->pipeline.pstipple;
 214    }
 215
 216    if (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
 217        rast->fill_back != PIPE_POLYGON_MODE_FILL) {
 218       draw->pipeline.unfilled->next = next;
 219       next = draw->pipeline.unfilled;
 220       precalc_flat = TRUE;              /* only needed for triangles really */
 221       need_det = TRUE;
 222    }
 223
 224    if (precalc_flat) {
 225       /*
 226        * could only run the stage if either rast->flatshade is true
 227        * or there's constant interpolated values.
 228        */
 229       draw->pipeline.flatshade->next = next;
 230       next = draw->pipeline.flatshade;
 231    }
 232
 233    if (rast->offset_point ||
 234        rast->offset_line ||
 235        rast->offset_tri) {
 236       draw->pipeline.offset->next = next;
 237       next = draw->pipeline.offset;
 238       need_det = TRUE;
 239    }
 240
 241    if (rast->light_twoside) {
 242       draw->pipeline.twoside->next = next;
 243       next = draw->pipeline.twoside;
 244       need_det = TRUE;
 245    }
 246
 247    /* Always run the cull stage as we calculate determinant there
 248     * also.
 249     *
 250     * This can actually be a win as culling out the triangles can lead
 251     * to less work emitting vertices, smaller vertex buffers, etc.
 252     * It's difficult to say whether this will be true in general.
 253     */
 254    if (need_det || rast->cull_face != PIPE_FACE_NONE ||
 255        draw_current_shader_num_written_culldistances(draw)) {
 256       draw->pipeline.cull->next = next;
 257       next = draw->pipeline.cull;
 258    }
 259
 260    /* Clip stage
 261     */
 262    if (draw->clip_xy || draw->clip_z || draw->clip_user)
 263    {
 264       draw->pipeline.clip->next = next;
 265       next = draw->pipeline.clip;
 266    }
 267
 268    draw->pipeline.first = next;
 269
 270    if (0) {
 271       debug_printf("draw pipeline:\n");
 272       for (next = draw->pipeline.first; next ; next = next->next )
 273          debug_printf("   %s\n", next->name);
 274       debug_printf("\n");
 275    }
 276
 277    return draw->pipeline.first;
 278 }
 279
 280 static void validate_tri( struct draw_stage *stage,
 281                           struct prim_header *header )
 282 {
 283    struct draw_stage *pipeline = validate_pipeline( stage );
 284    pipeline->tri( pipeline, header );
 285 }
 286
 287 static void validate_line( struct draw_stage *stage,
 288                            struct prim_header *header )
 289 {
 290    struct draw_stage *pipeline = validate_pipeline( stage );
 291    pipeline->line( pipeline, header );
 292 }
 293
 294 static void validate_point( struct draw_stage *stage,
 295                             struct prim_header *header )
 296 {
 297    struct draw_stage *pipeline = validate_pipeline( stage );
 298    pipeline->point( pipeline, header );
 299 }
 300
 301 static void validate_reset_stipple_counter( struct draw_stage *stage )
 302 {
 303    struct draw_stage *pipeline = validate_pipeline( stage );
 304    pipeline->reset_stipple_counter( pipeline );
 305 }
 306
 307 static void validate_flush( struct draw_stage *stage,
 308                             unsigned flags )
 309 {
 310    /* May need to pass a backend flush on to the rasterize stage.
 311     */
 312    if (stage->next)
 313       stage->next->flush( stage->next, flags );
 314 }
 315
 316
 317 static void validate_destroy( struct draw_stage *stage )
 318 {
 319    FREE( stage );
 320 }
 321
 322
 323 /**
 324  * Create validate pipeline stage.
 325  */
 326 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 327 {
 328    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 329    if (stage == NULL)
 330       return NULL;
 331
 332    stage->draw = draw;
 333    stage->name = "validate";
 334    stage->next = NULL;
 335    stage->point = validate_point;
 336    stage->line = validate_line;
 337    stage->tri = validate_tri;
 338    stage->flush = validate_flush;
 339    stage->reset_stipple_counter = validate_reset_stipple_counter;
 340    stage->destroy = validate_destroy;
 341
 342    return stage;
 343 }