src/gallium/auxiliary/draw/draw_context.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  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33
  34 #include "pipe/p_util.h"
  35 #include "draw_context.h"
  36 #include "draw_private.h"
  37 #include "draw_vbuf.h"
  38
  39
  40
  41 struct draw_context *draw_create( void )
  42 {
  43    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  44
  45 #if defined(__i386__) || defined(__386__)
  46    draw->use_sse = GETENV( "GALLIUM_NOSSE" ) == NULL;
  47 #else
  48    draw->use_sse = FALSE;
  49 #endif
  50
  51    /* create pipeline stages */
  52    draw->pipeline.wide_line  = draw_wide_line_stage( draw );
  53    draw->pipeline.wide_point = draw_wide_point_stage( draw );
  54    draw->pipeline.stipple   = draw_stipple_stage( draw );
  55    draw->pipeline.unfilled  = draw_unfilled_stage( draw );
  56    draw->pipeline.twoside   = draw_twoside_stage( draw );
  57    draw->pipeline.offset    = draw_offset_stage( draw );
  58    draw->pipeline.clip      = draw_clip_stage( draw );
  59    draw->pipeline.flatshade = draw_flatshade_stage( draw );
  60    draw->pipeline.cull      = draw_cull_stage( draw );
  61    draw->pipeline.validate  = draw_validate_stage( draw );
  62    draw->pipeline.first     = draw->pipeline.validate;
  63
  64    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
  65    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
  66    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
  67    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
  68    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
  69    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
  70    draw->nr_planes = 6;
  71
  72    /* Statically allocate maximum sized vertices for the cache - could be cleverer...
  73     */
  74    {
  75       uint i;
  76       const unsigned size = (MAX_VERTEX_SIZE + 0x0f) & ~0x0f;
  77       char *tmp = align_malloc(Elements(draw->vs.queue) * size, 16);
  78
  79       for (i = 0; i < Elements(draw->vs.queue); i++)
  80          draw->vs.queue[i].vertex = (struct vertex_header *)(tmp + i * size);
  81    }
  82
  83    draw->shader_queue_flush = draw_vertex_shader_queue_flush;
  84
  85    /* these defaults are oriented toward the needs of softpipe */
  86    draw->wide_point_threshold = 1000000.0; /* infinity */
  87    draw->wide_line_threshold = 1.0;
  88    draw->line_stipple = TRUE;
  89
  90    draw->reduced_prim = ~0; /* != any of PIPE_PRIM_x */
  91
  92    draw_vertex_cache_invalidate( draw );
  93    draw_set_mapped_element_buffer( draw, 0, NULL );
  94
  95    return draw;
  96 }
  97
  98
  99 void draw_destroy( struct draw_context *draw )
 100 {
 101    draw->pipeline.wide_line->destroy( draw->pipeline.wide_line );
 102    draw->pipeline.wide_point->destroy( draw->pipeline.wide_point );
 103    draw->pipeline.stipple->destroy( draw->pipeline.stipple );
 104    draw->pipeline.unfilled->destroy( draw->pipeline.unfilled );
 105    draw->pipeline.twoside->destroy( draw->pipeline.twoside );
 106    draw->pipeline.offset->destroy( draw->pipeline.offset );
 107    draw->pipeline.clip->destroy( draw->pipeline.clip );
 108    draw->pipeline.flatshade->destroy( draw->pipeline.flatshade );
 109    draw->pipeline.cull->destroy( draw->pipeline.cull );
 110    draw->pipeline.validate->destroy( draw->pipeline.validate );
 111    if (draw->pipeline.aaline)
 112       draw->pipeline.aaline->destroy( draw->pipeline.aaline );
 113    if (draw->pipeline.aapoint)
 114       draw->pipeline.aapoint->destroy( draw->pipeline.aapoint );
 115    if (draw->pipeline.rasterize)
 116       draw->pipeline.rasterize->destroy( draw->pipeline.rasterize );
 117    tgsi_exec_machine_free_data(&draw->machine);
 118    align_free( draw->vs.queue[0].vertex ); /* Frees all the vertices. */
 119
 120    /* Not so fast -- we're just borrowing this at the moment.
 121     *
 122    if (draw->render)
 123       draw->render->destroy( draw->render );
 124    */
 125
 126    FREE( draw );
 127 }
 128
 129
 130
 131 void draw_flush( struct draw_context *draw )
 132 {
 133    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 134 }
 135
 136
 137
 138 /**
 139  * Register new primitive rasterization/rendering state.
 140  * This causes the drawing pipeline to be rebuilt.
 141  */
 142 void draw_set_rasterizer_state( struct draw_context *draw,
 143                                 const struct pipe_rasterizer_state *raster )
 144 {
 145    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 146
 147    draw->rasterizer = raster;
 148 }
 149
 150
 151 /**
 152  * Plug in the primitive rendering/rasterization stage (which is the last
 153  * stage in the drawing pipeline).
 154  * This is provided by the device driver.
 155  */
 156 void draw_set_rasterize_stage( struct draw_context *draw,
 157                                struct draw_stage *stage )
 158 {
 159    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 160
 161    draw->pipeline.rasterize = stage;
 162 }
 163
 164
 165 /**
 166  * Set the draw module's clipping state.
 167  */
 168 void draw_set_clip_state( struct draw_context *draw,
 169                           const struct pipe_clip_state *clip )
 170 {
 171    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 172
 173    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 174    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 175    draw->nr_planes = 6 + clip->nr;
 176 }
 177
 178
 179 /**
 180  * Set the draw module's viewport state.
 181  */
 182 void draw_set_viewport_state( struct draw_context *draw,
 183                               const struct pipe_viewport_state *viewport )
 184 {
 185    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 186    draw->viewport = *viewport; /* struct copy */
 187 }
 188
 189
 190
 191 void
 192 draw_set_vertex_buffer(struct draw_context *draw,
 193                        unsigned attr,
 194                        const struct pipe_vertex_buffer *buffer)
 195 {
 196    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 197    assert(attr < PIPE_ATTRIB_MAX);
 198    draw->vertex_buffer[attr] = *buffer;
 199 }
 200
 201
 202 void
 203 draw_set_vertex_element(struct draw_context *draw,
 204                         unsigned attr,
 205                         const struct pipe_vertex_element *element)
 206 {
 207    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 208    assert(attr < PIPE_ATTRIB_MAX);
 209    draw->vertex_element[attr] = *element;
 210 }
 211
 212
 213 /**
 214  * Tell drawing context where to find mapped vertex buffers.
 215  */
 216 void
 217 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 218                               unsigned attr, const void *buffer)
 219 {
 220    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 221    draw->user.vbuffer[attr] = buffer;
 222 }
 223
 224
 225 void
 226 draw_set_mapped_constant_buffer(struct draw_context *draw,
 227                                 const void *buffer)
 228 {
 229    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 230    draw->user.constants = buffer;
 231 }
 232
 233
 234 /**
 235  * Tells the draw module to draw points with triangles if their size
 236  * is greater than this threshold.
 237  */
 238 void
 239 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 240 {
 241    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 242    draw->wide_point_threshold = threshold;
 243 }
 244
 245
 246 /**
 247  * Tells the draw module to draw lines with triangles if their width
 248  * is greater than this threshold.
 249  */
 250 void
 251 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 252 {
 253    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 254    draw->wide_line_threshold = threshold;
 255 }
 256
 257
 258 /**
 259  * Tells the draw module whether or not to implement line stipple.
 260  */
 261 void
 262 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 263 {
 264    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 265    draw->line_stipple = enable;
 266 }
 267
 268
 269 /**
 270  * Ask the draw module for the location/slot of the given vertex attribute in
 271  * a post-transformed vertex.
 272  *
 273  * With this function, drivers that use the draw module should have no reason
 274  * to track the current vertex shader.
 275  *
 276  * Note that the draw module may sometimes generate vertices with extra
 277  * attributes (such as texcoords for AA lines).  The driver can call this
 278  * function to find those attributes.
 279  *
 280  * Zero is returned if the attribute is not found since this is
 281  * a don't care / undefined situtation.  Returning -1 would be a bit more
 282  * work for the drivers.
 283  */
 284 int
 285 draw_find_vs_output(struct draw_context *draw,
 286                     uint semantic_name, uint semantic_index)
 287 {
 288    const struct draw_vertex_shader *vs = draw->vertex_shader;
 289    uint i;
 290    for (i = 0; i < vs->info.num_outputs; i++) {
 291       if (vs->info.output_semantic_name[i] == semantic_name &&
 292           vs->info.output_semantic_index[i] == semantic_index)
 293          return i;
 294    }
 295
 296    /* XXX there may be more than one extra vertex attrib.
 297     * For example, simulated gl_FragCoord and gl_PointCoord.
 298     */
 299    if (draw->extra_vp_outputs.semantic_name == semantic_name &&
 300        draw->extra_vp_outputs.semantic_index == semantic_index) {
 301       return draw->extra_vp_outputs.slot;
 302    }
 303    return 0;
 304 }
 305
 306
 307 /**
 308  * Return number of vertex shader outputs.
 309  */
 310 uint
 311 draw_num_vs_outputs(struct draw_context *draw)
 312 {
 313    uint count = draw->vertex_shader->info.num_outputs;
 314    if (draw->extra_vp_outputs.slot >= 0)
 315       count++;
 316    return count;
 317 }
 318
 319
 320 /**
 321  * Allocate space for temporary post-transform vertices, such as for clipping.
 322  */
 323 void draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr )
 324 {
 325    assert(!stage->tmp);
 326
 327    stage->nr_tmps = nr;
 328
 329    if (nr) {
 330       ubyte *store = (ubyte *) MALLOC( MAX_VERTEX_SIZE * nr );
 331       unsigned i;
 332
 333       stage->tmp = (struct vertex_header **) MALLOC( sizeof(struct vertex_header *) * nr );
 334
 335       for (i = 0; i < nr; i++)
 336          stage->tmp[i] = (struct vertex_header *)(store + i * MAX_VERTEX_SIZE);
 337    }
 338 }
 339
 340
 341 void draw_free_temp_verts( struct draw_stage *stage )
 342 {
 343    if (stage->tmp) {
 344       FREE( stage->tmp[0] );
 345       FREE( stage->tmp );
 346       stage->tmp = NULL;
 347    }
 348 }
 349
 350
 351 boolean draw_use_sse(struct draw_context *draw)
 352 {
 353    return (boolean) draw->use_sse;
 354 }
 355
 356
 357 void draw_reset_vertex_ids(struct draw_context *draw)
 358 {
 359    struct draw_stage *stage = draw->pipeline.first;
 360
 361    while (stage) {
 362       unsigned i;
 363
 364       for (i = 0; i < stage->nr_tmps; i++)
 365          stage->tmp[i]->vertex_id = UNDEFINED_VERTEX_ID;
 366
 367       stage = stage->next;
 368    }
 369
 370    draw_vertex_cache_reset_vertex_ids(draw);
 371 }
 372
 373
 374 void draw_set_render( struct draw_context *draw,
 375                       struct vbuf_render *render )
 376 {
 377    draw->render = render;
 378 }