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