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