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
  89    draw->reduced_prim = ~0; /* != any of PIPE_PRIM_x */
  90
  91    draw_vertex_cache_invalidate( draw );
  92    draw_set_mapped_element_buffer( draw, 0, NULL );
  93
  94    return draw;
  95 }
  96
  97
  98 void draw_destroy( struct draw_context *draw )
  99 {
 100    draw->pipeline.wide_line->destroy( draw->pipeline.wide_line );
 101    draw->pipeline.wide_point->destroy( draw->pipeline.wide_point );
 102    draw->pipeline.stipple->destroy( draw->pipeline.stipple );
 103    draw->pipeline.unfilled->destroy( draw->pipeline.unfilled );
 104    draw->pipeline.twoside->destroy( draw->pipeline.twoside );
 105    draw->pipeline.offset->destroy( draw->pipeline.offset );
 106    draw->pipeline.clip->destroy( draw->pipeline.clip );
 107    draw->pipeline.flatshade->destroy( draw->pipeline.flatshade );
 108    draw->pipeline.cull->destroy( draw->pipeline.cull );
 109    draw->pipeline.validate->destroy( draw->pipeline.validate );
 110    if (draw->pipeline.aaline)
 111       draw->pipeline.aaline->destroy( draw->pipeline.aaline );
 112    if (draw->pipeline.aapoint)
 113       draw->pipeline.aapoint->destroy( draw->pipeline.aapoint );
 114    if (draw->pipeline.rasterize)
 115       draw->pipeline.rasterize->destroy( draw->pipeline.rasterize );
 116    tgsi_exec_machine_free_data(&draw->machine);
 117    align_free( draw->vs.queue[0].vertex ); /* Frees all the vertices. */
 118
 119    /* Not so fast -- we're just borrowing this at the moment.
 120     *
 121    if (draw->render)
 122       draw->render->destroy( draw->render );
 123    */
 124
 125    FREE( draw );
 126 }
 127
 128
 129
 130 void draw_flush( struct draw_context *draw )
 131 {
 132    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 133 }
 134
 135
 136
 137 /**
 138  * Register new primitive rasterization/rendering state.
 139  * This causes the drawing pipeline to be rebuilt.
 140  */
 141 void draw_set_rasterizer_state( struct draw_context *draw,
 142                                 const struct pipe_rasterizer_state *raster )
 143 {
 144    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 145
 146    draw->rasterizer = raster;
 147 }
 148
 149
 150 /**
 151  * Plug in the primitive rendering/rasterization stage (which is the last
 152  * stage in the drawing pipeline).
 153  * This is provided by the device driver.
 154  */
 155 void draw_set_rasterize_stage( struct draw_context *draw,
 156                                struct draw_stage *stage )
 157 {
 158    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 159
 160    draw->pipeline.rasterize = stage;
 161 }
 162
 163
 164 /**
 165  * Set the draw module's clipping state.
 166  */
 167 void draw_set_clip_state( struct draw_context *draw,
 168                           const struct pipe_clip_state *clip )
 169 {
 170    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 171
 172    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 173    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 174    draw->nr_planes = 6 + clip->nr;
 175 }
 176
 177
 178 /**
 179  * Set the draw module's viewport state.
 180  */
 181 void draw_set_viewport_state( struct draw_context *draw,
 182                               const struct pipe_viewport_state *viewport )
 183 {
 184    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 185    draw->viewport = *viewport; /* struct copy */
 186 }
 187
 188
 189
 190 void
 191 draw_set_vertex_buffer(struct draw_context *draw,
 192                        unsigned attr,
 193                        const struct pipe_vertex_buffer *buffer)
 194 {
 195    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 196    assert(attr < PIPE_ATTRIB_MAX);
 197    draw->vertex_buffer[attr] = *buffer;
 198 }
 199
 200
 201 void
 202 draw_set_vertex_element(struct draw_context *draw,
 203                         unsigned attr,
 204                         const struct pipe_vertex_element *element)
 205 {
 206    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 207    assert(attr < PIPE_ATTRIB_MAX);
 208    draw->vertex_element[attr] = *element;
 209 }
 210
 211
 212 /**
 213  * Tell drawing context where to find mapped vertex buffers.
 214  */
 215 void
 216 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 217                               unsigned attr, const void *buffer)
 218 {
 219    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 220    draw->user.vbuffer[attr] = buffer;
 221 }
 222
 223
 224 void
 225 draw_set_mapped_constant_buffer(struct draw_context *draw,
 226                                 const void *buffer)
 227 {
 228    draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE/*STATE_CHANGE*/ );
 229    draw->user.constants = buffer;
 230 }
 231
 232
 233 /**
 234  * Tells the draw module to draw points with triangles if their size
 235  * is greater than this threshold.
 236  */
 237 void
 238 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 239 {
 240    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 241    draw->wide_point_threshold = threshold;
 242 }
 243
 244
 245 /**
 246  * Tells the draw module to draw lines with triangles if their width
 247  * is greater than this threshold.
 248  */
 249 void
 250 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 251 {
 252    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 253    draw->wide_line_threshold = threshold;
 254 }
 255
 256
 257 /**
 258  * Ask the draw module for the location/slot of the given vertex attribute in
 259  * a post-transformed vertex.
 260  *
 261  * With this function, drivers that use the draw module should have no reason
 262  * to track the current vertex shader.
 263  *
 264  * Note that the draw module may sometimes generate vertices with extra
 265  * attributes (such as texcoords for AA lines).  The driver can call this
 266  * function to find those attributes.
 267  *
 268  * Zero is returned if the attribute is not found since this is
 269  * a don't care / undefined situtation.  Returning -1 would be a bit more
 270  * work for the drivers.
 271  */
 272 int
 273 draw_find_vs_output(struct draw_context *draw,
 274                     uint semantic_name, uint semantic_index)
 275 {
 276    const struct draw_vertex_shader *vs = draw->vertex_shader;
 277    uint i;
 278    for (i = 0; i < vs->info.num_outputs; i++) {
 279       if (vs->info.output_semantic_name[i] == semantic_name &&
 280           vs->info.output_semantic_index[i] == semantic_index)
 281          return i;
 282    }
 283
 284    /* XXX there may be more than one extra vertex attrib.
 285     * For example, simulated gl_FragCoord and gl_PointCoord.
 286     */
 287    if (draw->extra_vp_outputs.semantic_name == semantic_name &&
 288        draw->extra_vp_outputs.semantic_index == semantic_index) {
 289       return draw->extra_vp_outputs.slot;
 290    }
 291    return 0;
 292 }
 293
 294
 295 /**
 296  * Return number of vertex shader outputs.
 297  */
 298 uint
 299 draw_num_vs_outputs(struct draw_context *draw)
 300 {
 301    uint count = draw->vertex_shader->info.num_outputs;
 302    if (draw->extra_vp_outputs.slot >= 0)
 303       count++;
 304    return count;
 305 }
 306
 307
 308 /**
 309  * Allocate space for temporary post-transform vertices, such as for clipping.
 310  */
 311 void draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr )
 312 {
 313    assert(!stage->tmp);
 314
 315    stage->nr_tmps = nr;
 316
 317    if (nr) {
 318       ubyte *store = (ubyte *) MALLOC( MAX_VERTEX_SIZE * nr );
 319       unsigned i;
 320
 321       stage->tmp = (struct vertex_header **) MALLOC( sizeof(struct vertex_header *) * nr );
 322
 323       for (i = 0; i < nr; i++)
 324          stage->tmp[i] = (struct vertex_header *)(store + i * MAX_VERTEX_SIZE);
 325    }
 326 }
 327
 328
 329 void draw_free_temp_verts( struct draw_stage *stage )
 330 {
 331    if (stage->tmp) {
 332       FREE( stage->tmp[0] );
 333       FREE( stage->tmp );
 334       stage->tmp = NULL;
 335    }
 336 }
 337
 338
 339 boolean draw_use_sse(struct draw_context *draw)
 340 {
 341    return (boolean) draw->use_sse;
 342 }
 343
 344
 345 void draw_reset_vertex_ids(struct draw_context *draw)
 346 {
 347    struct draw_stage *stage = draw->pipeline.first;
 348
 349    while (stage) {
 350       unsigned i;
 351
 352       for (i = 0; i < stage->nr_tmps; i++)
 353          stage->tmp[i]->vertex_id = UNDEFINED_VERTEX_ID;
 354
 355       stage = stage->next;
 356    }
 357
 358    draw_vertex_cache_reset_vertex_ids(draw);
 359 }
 360
 361
 362 void draw_set_render( struct draw_context *draw,
 363                       struct vbuf_render *render )
 364 {
 365    draw->render = render;
 366 }