src/mesa/pipe/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_SSE") != NULL;
  46 #else
  47    draw->use_sse = false;
  48 #endif
  49
  50    /* create pipeline stages */
  51    draw->pipeline.unfilled  = draw_unfilled_stage( draw );
  52    draw->pipeline.twoside   = draw_twoside_stage( draw );
  53    draw->pipeline.offset    = draw_offset_stage( draw );
  54    draw->pipeline.clip      = draw_clip_stage( draw );
  55    draw->pipeline.flatshade = draw_flatshade_stage( draw );
  56    draw->pipeline.cull      = draw_cull_stage( draw );
  57    draw->pipeline.feedback  = draw_feedback_stage( draw );
  58    draw->pipeline.validate  = draw_validate_stage( draw );
  59    draw->pipeline.first     = draw->pipeline.validate;
  60
  61    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
  62    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
  63    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
  64    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
  65    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
  66    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
  67    draw->nr_planes = 6;
  68
  69    /* Statically allocate maximum sized vertices for the cache - could be cleverer...
  70     */
  71    {
  72       int i;
  73       char *tmp = malloc(Elements(draw->vcache.vertex) * MAX_VERTEX_SIZE);
  74
  75       for (i = 0; i < Elements(draw->vcache.vertex); i++)
  76          draw->vcache.vertex[i] = (struct vertex_header *)(tmp + i * MAX_VERTEX_SIZE);
  77    }
  78
  79    draw->attrib_front0 = -1;
  80    draw->attrib_back0 = -1;
  81    draw->attrib_front1 = -1;
  82    draw->attrib_back1 = -1;
  83
  84    draw->prim = ~0; /* != any of PIPE_PRIM_x */
  85
  86    draw_vertex_cache_invalidate( draw );
  87
  88    return draw;
  89 }
  90
  91
  92 void draw_destroy( struct draw_context *draw )
  93 {
  94    free( draw->vcache.vertex[0] ); /* Frees all the vertices. */
  95    free( draw );
  96 }
  97
  98
  99
 100 void draw_flush( struct draw_context *draw )
 101 {
 102    if (draw->drawing)
 103       draw_do_flush( draw, DRAW_FLUSH_DRAW );
 104 }
 105
 106
 107 void draw_set_feedback_state( struct draw_context *draw,
 108                               const struct pipe_feedback_state *feedback )
 109 {
 110    draw_flush( draw );
 111    draw->feedback = *feedback;
 112 }
 113
 114
 115 /**
 116  * Register new primitive rasterization/rendering state.
 117  * This causes the drawing pipeline to be rebuilt.
 118  */
 119 void draw_set_rasterizer_state( struct draw_context *draw,
 120                                 const struct pipe_rasterizer_state *raster )
 121 {
 122    draw_flush( draw );
 123    draw->rasterizer = raster;
 124 }
 125
 126
 127 /**
 128  * Plug in the primitive rendering/rasterization stage.
 129  * This is provided by the device driver.
 130  */
 131 void draw_set_rasterize_stage( struct draw_context *draw,
 132                                struct draw_stage *stage )
 133 {
 134    draw_flush( draw );
 135    draw->pipeline.rasterize = stage;
 136 }
 137
 138
 139 /**
 140  * Set the draw module's clipping state.
 141  */
 142 void draw_set_clip_state( struct draw_context *draw,
 143                           const struct pipe_clip_state *clip )
 144 {
 145    draw_flush( draw );
 146
 147    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 148    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 149    draw->nr_planes = 6 + clip->nr;
 150 }
 151
 152
 153 /**
 154  * Set the draw module's viewport state.
 155  */
 156 void draw_set_viewport_state( struct draw_context *draw,
 157                               const struct pipe_viewport_state *viewport )
 158 {
 159    draw_flush( draw );
 160    draw->viewport = *viewport; /* struct copy */
 161 }
 162
 163
 164
 165 void
 166 draw_set_vertex_buffer(struct draw_context *draw,
 167                        unsigned attr,
 168                        const struct pipe_vertex_buffer *buffer)
 169 {
 170    draw_flush( draw );
 171
 172    assert(attr < PIPE_ATTRIB_MAX);
 173    draw->vertex_buffer[attr] = *buffer;
 174 }
 175
 176
 177 void
 178 draw_set_vertex_element(struct draw_context *draw,
 179                         unsigned attr,
 180                         const struct pipe_vertex_element *element)
 181 {
 182    draw_flush( draw );
 183
 184    assert(attr < PIPE_ATTRIB_MAX);
 185    draw->vertex_element[attr] = *element;
 186 }
 187
 188
 189 /**
 190  * Tell drawing context where to find mapped vertex buffers.
 191  */
 192 void
 193 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 194                               unsigned attr, const void *buffer)
 195 {
 196    draw_flush( draw );
 197
 198    draw->mapped_vbuffer[attr] = buffer;
 199 }
 200
 201
 202 void
 203 draw_set_mapped_constant_buffer(struct draw_context *draw,
 204                                 const void *buffer)
 205 {
 206    draw_flush( draw );
 207
 208    draw->mapped_constants = buffer;
 209 }
 210
 211
 212 void
 213 draw_set_mapped_feedback_buffer(struct draw_context *draw, uint index,
 214                                 void *buffer, uint size)
 215 {
 216    draw_flush( draw );
 217
 218    assert(index < PIPE_MAX_FEEDBACK_ATTRIBS);
 219    draw->mapped_feedback_buffer[index] = buffer;
 220    draw->mapped_feedback_buffer_size[index] = size; /* in bytes */
 221 }
 222
 223
 224
 225
 226
 227 /**
 228  * Allocate space for temporary post-transform vertices, such as for clipping.
 229  */
 230 void draw_alloc_tmps( struct draw_stage *stage, unsigned nr )
 231 {
 232    stage->nr_tmps = nr;
 233
 234    if (nr) {
 235       ubyte *store = (ubyte *) malloc(MAX_VERTEX_SIZE * nr);
 236       unsigned i;
 237
 238       stage->tmp = (struct vertex_header **) malloc(sizeof(struct vertex_header *) * nr);
 239
 240       for (i = 0; i < nr; i++)
 241          stage->tmp[i] = (struct vertex_header *)(store + i * MAX_VERTEX_SIZE);
 242    }
 243 }
 244
 245 void draw_free_tmps( struct draw_stage *stage )
 246 {
 247    if (stage->tmp) {
 248       free(stage->tmp[0]);
 249       free(stage->tmp);
 250    }
 251 }
 252
 253 boolean draw_use_sse(struct draw_context *draw)
 254 {
 255    return draw->use_sse;
 256 }
 257
 258