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 "util/u_math.h"
  33 #include "pipe/p_defines.h"
  34 #include "draw_private.h"
  35 #include "draw_pipe.h"
  36 #include "draw_context.h"
  37 #include "draw_vbuf.h"
  38
  39 static boolean points( unsigned prim )
  40 {
  41    return (prim == PIPE_PRIM_POINTS);
  42 }
  43
  44 static boolean lines( unsigned prim )
  45 {
  46    return (prim == PIPE_PRIM_LINES ||
  47            prim == PIPE_PRIM_LINE_STRIP ||
  48            prim == PIPE_PRIM_LINE_LOOP);
  49 }
  50
  51 static boolean triangles( unsigned prim )
  52 {
  53    return prim >= PIPE_PRIM_TRIANGLES;
  54 }
  55
  56 /**
  57  * Default version of a function to check if we need any special
  58  * pipeline stages, or whether prims/verts can go through untouched.
  59  * Don't test for bypass clipping or vs modes, this function is just
  60  * about the primitive pipeline stages.
  61  *
  62  * This can be overridden by the driver.
  63  */
  64 boolean
  65 draw_need_pipeline(const struct draw_context *draw,
  66                    const struct pipe_rasterizer_state *rasterizer,
  67                    unsigned int prim )
  68 {
  69    /* If the driver has overridden this, use that version:
  70     */
  71    if (draw->render &&
  72        draw->render->need_pipeline)
  73    {
  74       return draw->render->need_pipeline( draw->render,
  75                                           rasterizer,
  76                                           prim );
  77    }
  78
  79    /* Don't have to worry about triangles turning into lines/points
  80     * and triggering the pipeline, because we have to trigger the
  81     * pipeline *anyway* if unfilled mode is active.
  82     */
  83    if (lines(prim))
  84    {
  85       /* line stipple */
  86       if (rasterizer->line_stipple_enable && draw->pipeline.line_stipple)
  87          return TRUE;
  88
  89       /* wide lines */
  90       if (roundf(rasterizer->line_width) > draw->pipeline.wide_line_threshold)
  91          return TRUE;
  92
  93       /* AA lines */
  94       if (rasterizer->line_smooth && draw->pipeline.aaline)
  95          return TRUE;
  96    }
  97
  98    if (points(prim))
  99    {
 100       /* large points */
 101       if (rasterizer->point_size > draw->pipeline.wide_point_threshold)
 102          return TRUE;
 103
 104       /* sprite points */
 105       if (rasterizer->point_quad_rasterization
 106           && draw->pipeline.wide_point_sprites)
 107          return TRUE;
 108
 109       /* AA points */
 110       if (rasterizer->point_smooth && draw->pipeline.aapoint)
 111          return TRUE;
 112
 113       /* point sprites */
 114       if (rasterizer->sprite_coord_enable && draw->pipeline.point_sprite)
 115          return TRUE;
 116    }
 117
 118
 119    if (triangles(prim))
 120    {
 121       /* polygon stipple */
 122       if (rasterizer->poly_stipple_enable && draw->pipeline.pstipple)
 123          return TRUE;
 124
 125       /* unfilled polygons */
 126       if (rasterizer->fill_front != PIPE_POLYGON_MODE_FILL ||
 127           rasterizer->fill_back != PIPE_POLYGON_MODE_FILL)
 128          return TRUE;
 129
 130       /* polygon offset */
 131       if (rasterizer->offset_point ||
 132           rasterizer->offset_line ||
 133           rasterizer->offset_tri)
 134          return TRUE;
 135
 136       /* two-side lighting */
 137       if (rasterizer->light_twoside)
 138          return TRUE;
 139    }
 140
 141    /* polygon cull - this is difficult - hardware can cull just fine
 142     * most of the time (though sometimes CULL_NEITHER is unsupported.
 143     *
 144     * Generally this isn't a reason to require the pipeline, though.
 145     *
 146    if (rasterizer->cull_mode)
 147       return TRUE;
 148     */
 149
 150    return FALSE;
 151 }
 152
 153
 154
 155 /**
 156  * Rebuild the rendering pipeline.
 157  */
 158 static struct draw_stage *validate_pipeline( struct draw_stage *stage )
 159 {
 160    struct draw_context *draw = stage->draw;
 161    struct draw_stage *next = draw->pipeline.rasterize;
 162    boolean need_det = FALSE;
 163    boolean precalc_flat = FALSE;
 164    boolean wide_lines, wide_points;
 165    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 166
 167    /* Set the validate's next stage to the rasterize stage, so that it
 168     * can be found later if needed for flushing.
 169     */
 170    stage->next = next;
 171
 172    /* drawing wide lines? */
 173    wide_lines = (roundf(rast->line_width) > draw->pipeline.wide_line_threshold
 174                  && !rast->line_smooth);
 175
 176    /* drawing large/sprite points (but not AA points)? */
 177    if (rast->sprite_coord_enable && draw->pipeline.point_sprite)
 178       wide_points = TRUE;
 179    else if (rast->point_smooth && draw->pipeline.aapoint)
 180       wide_points = FALSE;
 181    else if (rast->point_size > draw->pipeline.wide_point_threshold)
 182       wide_points = TRUE;
 183    else if (rast->point_quad_rasterization && draw->pipeline.wide_point_sprites)
 184       wide_points = TRUE;
 185    else
 186       wide_points = FALSE;
 187
 188    /*
 189     * NOTE: we build up the pipeline in end-to-start order.
 190     *
 191     * TODO: make the current primitive part of the state and build
 192     * shorter pipelines for lines & points.
 193     */
 194
 195    if (rast->line_smooth && draw->pipeline.aaline) {
 196       draw->pipeline.aaline->next = next;
 197       next = draw->pipeline.aaline;
 198       precalc_flat = TRUE;
 199    }
 200
 201    if (rast->point_smooth && draw->pipeline.aapoint) {
 202       draw->pipeline.aapoint->next = next;
 203       next = draw->pipeline.aapoint;
 204    }
 205
 206    if (wide_lines) {
 207       draw->pipeline.wide_line->next = next;
 208       next = draw->pipeline.wide_line;
 209       precalc_flat = TRUE;
 210    }
 211
 212    if (wide_points) {
 213       draw->pipeline.wide_point->next = next;
 214       next = draw->pipeline.wide_point;
 215    }
 216
 217    if (rast->line_stipple_enable && draw->pipeline.line_stipple) {
 218       draw->pipeline.stipple->next = next;
 219       next = draw->pipeline.stipple;
 220       precalc_flat = TRUE;              /* only needed for lines really */
 221    }
 222
 223    if (rast->poly_stipple_enable
 224        && draw->pipeline.pstipple) {
 225       draw->pipeline.pstipple->next = next;
 226       next = draw->pipeline.pstipple;
 227    }
 228
 229    if (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
 230        rast->fill_back != PIPE_POLYGON_MODE_FILL) {
 231       draw->pipeline.unfilled->next = next;
 232       next = draw->pipeline.unfilled;
 233       precalc_flat = TRUE;              /* only needed for triangles really */
 234       need_det = TRUE;
 235    }
 236
 237    if (rast->flatshade && precalc_flat) {
 238       draw->pipeline.flatshade->next = next;
 239       next = draw->pipeline.flatshade;
 240    }
 241
 242    if (rast->offset_point ||
 243        rast->offset_line ||
 244        rast->offset_tri) {
 245       draw->pipeline.offset->next = next;
 246       next = draw->pipeline.offset;
 247       need_det = TRUE;
 248    }
 249
 250    if (rast->light_twoside) {
 251       draw->pipeline.twoside->next = next;
 252       next = draw->pipeline.twoside;
 253       need_det = TRUE;
 254    }
 255
 256    /* Always run the cull stage as we calculate determinant there
 257     * also.
 258     *
 259     * This can actually be a win as culling out the triangles can lead
 260     * to less work emitting vertices, smaller vertex buffers, etc.
 261     * It's difficult to say whether this will be true in general.
 262     */
 263    if (need_det || rast->cull_face != PIPE_FACE_NONE) {
 264       draw->pipeline.cull->next = next;
 265       next = draw->pipeline.cull;
 266    }
 267
 268    /* Clip stage
 269     */
 270    if (draw->clip_xy || draw->clip_z || draw->clip_user)
 271    {
 272       draw->pipeline.clip->next = next;
 273       next = draw->pipeline.clip;
 274    }
 275
 276
 277    draw->pipeline.first = next;
 278
 279    if (0) {
 280       debug_printf("draw pipeline:\n");
 281       for (next = draw->pipeline.first; next ; next = next->next )
 282          debug_printf("   %s\n", next->name);
 283       debug_printf("\n");
 284    }
 285
 286    return draw->pipeline.first;
 287 }
 288
 289 static void validate_tri( struct draw_stage *stage,
 290                           struct prim_header *header )
 291 {
 292    struct draw_stage *pipeline = validate_pipeline( stage );
 293    pipeline->tri( pipeline, header );
 294 }
 295
 296 static void validate_line( struct draw_stage *stage,
 297                            struct prim_header *header )
 298 {
 299    struct draw_stage *pipeline = validate_pipeline( stage );
 300    pipeline->line( pipeline, header );
 301 }
 302
 303 static void validate_point( struct draw_stage *stage,
 304                             struct prim_header *header )
 305 {
 306    struct draw_stage *pipeline = validate_pipeline( stage );
 307    pipeline->point( pipeline, header );
 308 }
 309
 310 static void validate_reset_stipple_counter( struct draw_stage *stage )
 311 {
 312    struct draw_stage *pipeline = validate_pipeline( stage );
 313    pipeline->reset_stipple_counter( pipeline );
 314 }
 315
 316 static void validate_flush( struct draw_stage *stage,
 317                             unsigned flags )
 318 {
 319    /* May need to pass a backend flush on to the rasterize stage.
 320     */
 321    if (stage->next)
 322       stage->next->flush( stage->next, flags );
 323 }
 324
 325
 326 static void validate_destroy( struct draw_stage *stage )
 327 {
 328    FREE( stage );
 329 }
 330
 331
 332 /**
 333  * Create validate pipeline stage.
 334  */
 335 struct draw_stage *draw_validate_stage( struct draw_context *draw )
 336 {
 337    struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
 338    if (stage == NULL)
 339       return NULL;
 340
 341    stage->draw = draw;
 342    stage->name = "validate";
 343    stage->next = NULL;
 344    stage->point = validate_point;
 345    stage->line = validate_line;
 346    stage->tri = validate_tri;
 347    stage->flush = validate_flush;
 348    stage->reset_stipple_counter = validate_reset_stipple_counter;
 349    stage->destroy = validate_destroy;
 350
 351    return stage;
 352 }