src/gallium/auxiliary/draw/draw_pipe_validate.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  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, non-AA lines? */
 160    wide_lines = rast->line_width != 1.0f &&
 161                 roundf(rast->line_width) > draw->pipeline.wide_line_threshold &&
 162                 !rast->line_smooth;
 163
 164    /* drawing large/sprite points (but not AA points)? */
 165    if (rast->sprite_coord_enable && draw->pipeline.point_sprite)
 166       wide_points = TRUE;
 167    else if (rast->point_smooth && draw->pipeline.aapoint)
 168       wide_points = FALSE;
 169    else if (rast->point_size > draw->pipeline.wide_point_threshold)
 170       wide_points = TRUE;
 171    else if (rast->point_quad_rasterization && draw->pipeline.wide_point_sprites)
 172       wide_points = TRUE;
 173    else
 174       wide_points = FALSE;
 175
 176    /*
 177     * NOTE: we build up the pipeline in end-to-start order.
 178     *
 179     * TODO: make the current primitive part of the state and build
 180     * shorter pipelines for lines & points.
 181     */
 182
 183    if (rast->line_smooth && draw->pipeline.aaline) {
 184       draw->pipeline.aaline->next = next;
 185       next = draw->pipeline.aaline;
 186       precalc_flat = TRUE;
 187    }
 188
 189    if (rast->point_smooth && draw->pipeline.aapoint) {
 190       draw->pipeline.aapoint->next = next;
 191       next = draw->pipeline.aapoint;
 192    }
 193
 194    if (wide_lines) {
 195       draw->pipeline.wide_line->next = next;
 196       next = draw->pipeline.wide_line;
 197       precalc_flat = TRUE;
 198    }
 199
 200    if (wide_points) {
 201       draw->pipeline.wide_point->next = next;
 202       next = draw->pipeline.wide_point;
 203    }
 204
 205    if (rast->line_stipple_enable && draw->pipeline.line_stipple) {
 206       draw->pipeline.stipple->next = next;
 207       next = draw->pipeline.stipple;
 208       precalc_flat = TRUE;              /* only needed for lines really */
 209    }
 210
 211    if (rast->poly_stipple_enable
 212        && draw->pipeline.pstipple) {
 213       draw->pipeline.pstipple->next = next;
 214       next = draw->pipeline.pstipple;
 215    }
 216
 217    if (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
 218        rast->fill_back != PIPE_POLYGON_MODE_FILL) {
 219       draw->pipeline.unfilled->next = next;
 220       next = draw->pipeline.unfilled;
 221       precalc_flat = TRUE;              /* only needed for triangles really */
 222       need_det = TRUE;
 223    }
 224
 225    if (precalc_flat) {
 226       /*
 227        * could only run the stage if either rast->flatshade is true
 228        * or there's constant interpolated values.
 229        */
 230       draw->pipeline.flatshade->next = next;
 231       next = draw->pipeline.flatshade;
 232    }
 233
 234    if (rast->offset_point ||
 235        rast->offset_line ||
 236        rast->offset_tri) {
 237       draw->pipeline.offset->next = next;
 238       next = draw->pipeline.offset;
 239       need_det = TRUE;
 240    }
 241
 242    if (rast->light_twoside) {
 243       draw->pipeline.twoside->next = next;
 244       next = draw->pipeline.twoside;
 245       need_det = TRUE;
 246    }
 247
 248    /* Always run the cull stage as we calculate determinant there
 249     * also.
 250     *
 251     * This can actually be a win as culling out the triangles can lead
 252     * to less work emitting vertices, smaller vertex buffers, etc.
 253     * It's difficult to say whether this will be true in general.
 254     */
 255    if (need_det || rast->cull_face != PIPE_FACE_NONE ||
 256        draw_current_shader_num_written_culldistances(draw)) {
 257       draw->pipeline.cull->next = next;
 258       next = draw->pipeline.cull;
 259    }
 260
 261    /* Clip stage
 262     */
 263    if (draw->clip_xy || draw->clip_z || draw->clip_user)
 264    {
 265       draw->pipeline.clip->next = next;
 266       next = draw->pipeline.clip;
 267    }
 268
 269    draw->pipeline.first = next;
 270
 271    if (0) {
 272       debug_printf("draw pipeline:\n");
 273       for (next = draw->pipeline.first; next ; next = next->next )
 274          debug_printf("   %s\n", next->name);
 275       debug_printf("\n");
 276    }
 277
 278    return draw->pipeline.first;
 279 }
 280
 281 static void validate_tri( struct draw_stage *stage,
 282                           struct prim_header *header )
 283 {
 284    struct draw_stage *pipeline = validate_pipeline( stage );
 285    pipeline->tri( pipeline, header );
 286 }
 287
 288 static void validate_line( struct draw_stage *stage,
 289                            struct prim_header *header )
 290 {
 291    struct draw_stage *pipeline = validate_pipeline( stage );
 292    pipeline->line( pipeline, header );
 293 }
 294
 295 static void validate_point( struct draw_stage *stage,
 296                             struct prim_header *header )
 297 {
 298    struct draw_stage *pipeline = validate_pipeline( stage );
 299    pipeline->point( pipeline, header );
 300 }
 301
 302 static void validate_reset_stipple_counter( struct draw_stage *stage )
 303 {
 304    struct draw_stage *pipeline = validate_pipeline( stage );
 305    pipeline->reset_stipple_counter( pipeline );
 306 }
 307
 308 static void validate_flush( struct draw_stage *stage,
 309                             unsigned flags )
 310 {
 311    /* May need to pass a backend flush on to the rasterize stage.
 312     */
 313    if (stage->next)
 314       stage->next->flush( stage->next, flags );
 315 }
 316
 317
 318 static void validate_destroy( struct draw_stage *stage )
 319 {
 320    FREE( stage );
 321 }
 322
 323
 324 /**
 325  * Create validate pipeline stage.
 326  */
 327 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 328 {
 329    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 330    if (!stage)
 331       return NULL;
 332
 333    stage->draw = draw;
 334    stage->name = "validate";
 335    stage->next = NULL;
 336    stage->point = validate_point;
 337    stage->line = validate_line;
 338    stage->tri = validate_tri;
 339    stage->flush = validate_flush;
 340    stage->reset_stipple_counter = validate_reset_stipple_counter;
 341    stage->destroy = validate_destroy;
 342
 343    return stage;
 344 }