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       /* AA points */
 104       if (rasterizer->point_smooth && draw->pipeline.aapoint)
 105          return TRUE;
 106
 107       /* point sprites */
 108       if (rasterizer->point_sprite && draw->pipeline.point_sprite)
 109          return TRUE;
 110    }
 111
 112
 113    if (triangles(prim))
 114    {
 115       /* polygon stipple */
 116       if (rasterizer->poly_stipple_enable && draw->pipeline.pstipple)
 117          return TRUE;
 118
 119       /* unfilled polygons */
 120       if (rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 121           rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL)
 122          return TRUE;
 123
 124       /* polygon offset */
 125       if (rasterizer->offset_cw || rasterizer->offset_ccw)
 126          return TRUE;
 127
 128       /* two-side lighting */
 129       if (rasterizer->light_twoside)
 130          return TRUE;
 131    }
 132
 133    /* polygon cull - this is difficult - hardware can cull just fine
 134     * most of the time (though sometimes CULL_NEITHER is unsupported.
 135     *
 136     * Generally this isn't a reason to require the pipeline, though.
 137     *
 138    if (rasterizer->cull_mode)
 139       return TRUE;
 140     */
 141
 142    return FALSE;
 143 }
 144
 145
 146
 147 /**
 148  * Rebuild the rendering pipeline.
 149  */
 150 static struct draw_stage *validate_pipeline( struct draw_stage *stage )
 151 {
 152    struct draw_context *draw = stage->draw;
 153    struct draw_stage *next = draw->pipeline.rasterize;
 154    boolean need_det = FALSE;
 155    boolean precalc_flat = FALSE;
 156    boolean wide_lines, wide_points;
 157
 158    /* Set the validate's next stage to the rasterize stage, so that it
 159     * can be found later if needed for flushing.
 160     */
 161    stage->next = next;
 162
 163    /* drawing wide lines? */
 164    wide_lines = (draw->rasterizer->line_width > draw->pipeline.wide_line_threshold
 165                  && !draw->rasterizer->line_smooth);
 166
 167    /* drawing large points? */
 168    if (draw->rasterizer->point_sprite && draw->pipeline.point_sprite)
 169       wide_points = TRUE;
 170    else if (draw->rasterizer->point_smooth && draw->pipeline.aapoint)
 171       wide_points = FALSE;
 172    else if (draw->rasterizer->point_size > draw->pipeline.wide_point_threshold)
 173       wide_points = TRUE;
 174    else
 175       wide_points = FALSE;
 176
 177    /*
 178     * NOTE: we build up the pipeline in end-to-start order.
 179     *
 180     * TODO: make the current primitive part of the state and build
 181     * shorter pipelines for lines & points.
 182     */
 183
 184    if (draw->rasterizer->line_smooth && draw->pipeline.aaline) {
 185       draw->pipeline.aaline->next = next;
 186       next = draw->pipeline.aaline;
 187    }
 188
 189    if (draw->rasterizer->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 || draw->rasterizer->point_sprite) {
 201       draw->pipeline.wide_point->next = next;
 202       next = draw->pipeline.wide_point;
 203    }
 204
 205    if (draw->rasterizer->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 (draw->rasterizer->poly_stipple_enable
 212        && draw->pipeline.pstipple) {
 213       draw->pipeline.pstipple->next = next;
 214       next = draw->pipeline.pstipple;
 215    }
 216
 217    if (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
 218        draw->rasterizer->fill_ccw != 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 (draw->rasterizer->flatshade && precalc_flat) {
 226       draw->pipeline.flatshade->next = next;
 227       next = draw->pipeline.flatshade;
 228    }
 229
 230    if (draw->rasterizer->offset_cw ||
 231        draw->rasterizer->offset_ccw) {
 232       draw->pipeline.offset->next = next;
 233       next = draw->pipeline.offset;
 234       need_det = TRUE;
 235    }
 236
 237    if (draw->rasterizer->light_twoside) {
 238       draw->pipeline.twoside->next = next;
 239       next = draw->pipeline.twoside;
 240       need_det = TRUE;
 241    }
 242
 243    /* Always run the cull stage as we calculate determinant there
 244     * also.
 245     *
 246     * This can actually be a win as culling out the triangles can lead
 247     * to less work emitting vertices, smaller vertex buffers, etc.
 248     * It's difficult to say whether this will be true in general.
 249     */
 250    if (need_det || draw->rasterizer->cull_mode) {
 251       draw->pipeline.cull->next = next;
 252       next = draw->pipeline.cull;
 253    }
 254
 255    /* Clip stage
 256     */
 257    if (!draw->bypass_clipping)
 258    {
 259       draw->pipeline.clip->next = next;
 260       next = draw->pipeline.clip;
 261    }
 262
 263
 264    draw->pipeline.first = next;
 265
 266    if (0) {
 267       debug_printf("draw pipeline:\n");
 268       for (next = draw->pipeline.first; next ; next = next->next )
 269          debug_printf("   %s\n", next->name);
 270       debug_printf("\n");
 271    }
 272
 273    return draw->pipeline.first;
 274 }
 275
 276 static void validate_tri( struct draw_stage *stage,
 277                           struct prim_header *header )
 278 {
 279    struct draw_stage *pipeline = validate_pipeline( stage );
 280    pipeline->tri( pipeline, header );
 281 }
 282
 283 static void validate_line( struct draw_stage *stage,
 284                            struct prim_header *header )
 285 {
 286    struct draw_stage *pipeline = validate_pipeline( stage );
 287    pipeline->line( pipeline, header );
 288 }
 289
 290 static void validate_point( struct draw_stage *stage,
 291                             struct prim_header *header )
 292 {
 293    struct draw_stage *pipeline = validate_pipeline( stage );
 294    pipeline->point( pipeline, header );
 295 }
 296
 297 static void validate_reset_stipple_counter( struct draw_stage *stage )
 298 {
 299    struct draw_stage *pipeline = validate_pipeline( stage );
 300    pipeline->reset_stipple_counter( pipeline );
 301 }
 302
 303 static void validate_flush( struct draw_stage *stage,
 304                             unsigned flags )
 305 {
 306    /* May need to pass a backend flush on to the rasterize stage.
 307     */
 308    if (stage->next)
 309       stage->next->flush( stage->next, flags );
 310 }
 311
 312
 313 static void validate_destroy( struct draw_stage *stage )
 314 {
 315    FREE( stage );
 316 }
 317
 318
 319 /**
 320  * Create validate pipeline stage.
 321  */
 322 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 323 {
 324    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 325    if (stage == NULL)
 326       return NULL;
 327
 328    stage->draw = draw;
 329    stage->name = "validate";
 330    stage->next = NULL;
 331    stage->point = validate_point;
 332    stage->line = validate_line;
 333    stage->tri = validate_tri;
 334    stage->flush = validate_flush;
 335    stage->reset_stipple_counter = validate_reset_stipple_counter;
 336    stage->destroy = validate_destroy;
 337
 338    return stage;
 339 }