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_vbuf.h"
  37 #include "draw_vs.h"
  38 #include "draw_pt.h"
  39 #include "draw_pipe.h"
  40
  41
  42 struct draw_context *draw_create( void )
  43 {
  44    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  45    if (draw == NULL)
  46       goto fail;
  47
  48    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
  49    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
  50    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
  51    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
  52    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
  53    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
  54    draw->nr_planes = 6;
  55
  56
  57    draw->reduced_prim = ~0; /* != any of PIPE_PRIM_x */
  58
  59
  60    if (!draw_pipeline_init( draw ))
  61       goto fail;
  62
  63    if (!draw_pt_init( draw ))
  64       goto fail;
  65
  66 #ifdef PIPE_ARCH_X86
  67    if (!draw_vs_init( draw ))
  68       goto fail;
  69 #endif
  70
  71    return draw;
  72
  73 fail:
  74    draw_destroy( draw );
  75    return NULL;
  76 }
  77
  78
  79 void draw_destroy( struct draw_context *draw )
  80 {
  81    if (!draw)
  82       return;
  83
  84
  85
  86    /* Not so fast -- we're just borrowing this at the moment.
  87     *
  88    if (draw->render)
  89       draw->render->destroy( draw->render );
  90    */
  91
  92    draw_pipeline_destroy( draw );
  93    draw_pt_destroy( draw );
  94    draw_vs_destroy( draw );
  95
  96    FREE( draw );
  97 }
  98
  99
 100
 101 void draw_flush( struct draw_context *draw )
 102 {
 103    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 104 }
 105
 106
 107
 108 /**
 109  * Register new primitive rasterization/rendering state.
 110  * This causes the drawing pipeline to be rebuilt.
 111  */
 112 void draw_set_rasterizer_state( struct draw_context *draw,
 113                                 const struct pipe_rasterizer_state *raster )
 114 {
 115    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 116
 117    draw->rasterizer = raster;
 118    draw->bypass_clipping =
 119       ((draw->rasterizer && draw->rasterizer->bypass_clipping) ||
 120        draw->driver.bypass_clipping);
 121 }
 122
 123
 124 void draw_set_driver_clipping( struct draw_context *draw,
 125                                boolean bypass_clipping )
 126 {
 127    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 128
 129    draw->driver.bypass_clipping = bypass_clipping;
 130    draw->bypass_clipping = (draw->rasterizer->bypass_clipping ||
 131                             draw->driver.bypass_clipping);
 132 }
 133
 134
 135 /**
 136  * Plug in the primitive rendering/rasterization stage (which is the last
 137  * stage in the drawing pipeline).
 138  * This is provided by the device driver.
 139  */
 140 void draw_set_rasterize_stage( struct draw_context *draw,
 141                                struct draw_stage *stage )
 142 {
 143    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 144
 145    draw->pipeline.rasterize = stage;
 146 }
 147
 148
 149 /**
 150  * Set the draw module's clipping state.
 151  */
 152 void draw_set_clip_state( struct draw_context *draw,
 153                           const struct pipe_clip_state *clip )
 154 {
 155    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 156
 157    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 158    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 159    draw->nr_planes = 6 + clip->nr;
 160 }
 161
 162
 163 /**
 164  * Set the draw module's viewport state.
 165  */
 166 void draw_set_viewport_state( struct draw_context *draw,
 167                               const struct pipe_viewport_state *viewport )
 168 {
 169    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 170    draw->viewport = *viewport; /* struct copy */
 171    draw->identity_viewport = (viewport->scale[0] == 1.0f &&
 172                               viewport->scale[1] == 1.0f &&
 173                               viewport->scale[2] == 1.0f &&
 174                               viewport->scale[3] == 1.0f &&
 175                               viewport->translate[0] == 0.0f &&
 176                               viewport->translate[1] == 0.0f &&
 177                               viewport->translate[2] == 0.0f &&
 178                               viewport->translate[3] == 0.0f);
 179
 180    draw_vs_set_viewport( draw, viewport );
 181 }
 182
 183
 184
 185 void
 186 draw_set_vertex_buffers(struct draw_context *draw,
 187                         unsigned count,
 188                         const struct pipe_vertex_buffer *buffers)
 189 {
 190    assert(count <= PIPE_MAX_ATTRIBS);
 191
 192    memcpy(draw->pt.vertex_buffer, buffers, count * sizeof(buffers[0]));
 193    draw->pt.nr_vertex_buffers = count;
 194 }
 195
 196
 197 void
 198 draw_set_vertex_elements(struct draw_context *draw,
 199                          unsigned count,
 200                          const struct pipe_vertex_element *elements)
 201 {
 202    assert(count <= PIPE_MAX_ATTRIBS);
 203
 204    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 205    draw->pt.nr_vertex_elements = count;
 206 }
 207
 208
 209 /**
 210  * Tell drawing context where to find mapped vertex buffers.
 211  */
 212 void
 213 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 214                               unsigned attr, const void *buffer)
 215 {
 216    draw->pt.user.vbuffer[attr] = buffer;
 217 }
 218
 219
 220 void
 221 draw_set_mapped_constant_buffer(struct draw_context *draw,
 222                                 const void *buffer,
 223                                 unsigned size )
 224 {
 225    draw->pt.user.constants = buffer;
 226    draw_vs_set_constants( draw, (const float (*)[4])buffer, size );
 227 }
 228
 229
 230 /**
 231  * Tells the draw module to draw points with triangles if their size
 232  * is greater than this threshold.
 233  */
 234 void
 235 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 236 {
 237    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 238    draw->pipeline.wide_point_threshold = threshold;
 239 }
 240
 241
 242 /**
 243  * Tells the draw module to draw lines with triangles if their width
 244  * is greater than this threshold.
 245  */
 246 void
 247 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 248 {
 249    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 250    draw->pipeline.wide_line_threshold = threshold;
 251 }
 252
 253
 254 /**
 255  * Tells the draw module whether or not to implement line stipple.
 256  */
 257 void
 258 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 259 {
 260    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 261    draw->pipeline.line_stipple = enable;
 262 }
 263
 264
 265 /**
 266  * Tells draw module whether to convert points to quads for sprite mode.
 267  */
 268 void
 269 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 270 {
 271    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 272    draw->pipeline.point_sprite = enable;
 273 }
 274
 275
 276 /**
 277  * Ask the draw module for the location/slot of the given vertex attribute in
 278  * a post-transformed vertex.
 279  *
 280  * With this function, drivers that use the draw module should have no reason
 281  * to track the current vertex shader.
 282  *
 283  * Note that the draw module may sometimes generate vertices with extra
 284  * attributes (such as texcoords for AA lines).  The driver can call this
 285  * function to find those attributes.
 286  *
 287  * Zero is returned if the attribute is not found since this is
 288  * a don't care / undefined situtation.  Returning -1 would be a bit more
 289  * work for the drivers.
 290  */
 291 int
 292 draw_find_vs_output(struct draw_context *draw,
 293                     uint semantic_name, uint semantic_index)
 294 {
 295    const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
 296    uint i;
 297    for (i = 0; i < vs->info.num_outputs; i++) {
 298       if (vs->info.output_semantic_name[i] == semantic_name &&
 299           vs->info.output_semantic_index[i] == semantic_index)
 300          return i;
 301    }
 302
 303    /* XXX there may be more than one extra vertex attrib.
 304     * For example, simulated gl_FragCoord and gl_PointCoord.
 305     */
 306    if (draw->extra_vp_outputs.semantic_name == semantic_name &&
 307        draw->extra_vp_outputs.semantic_index == semantic_index) {
 308       return draw->extra_vp_outputs.slot;
 309    }
 310    return 0;
 311 }
 312
 313
 314 /**
 315  * Return number of vertex shader outputs.
 316  */
 317 uint
 318 draw_num_vs_outputs(struct draw_context *draw)
 319 {
 320    uint count = draw->vs.vertex_shader->info.num_outputs;
 321    if (draw->extra_vp_outputs.slot > 0)
 322       count++;
 323    return count;
 324 }
 325
 326
 327
 328 void draw_set_render( struct draw_context *draw,
 329                       struct vbuf_render *render )
 330 {
 331    draw->render = render;
 332 }
 333
 334 void draw_set_edgeflags( struct draw_context *draw,
 335                          const unsigned *edgeflag )
 336 {
 337    draw->pt.user.edgeflag = edgeflag;
 338 }
 339
 340
 341
 342
 343 /**
 344  * Tell the drawing context about the index/element buffer to use
 345  * (ala glDrawElements)
 346  * If no element buffer is to be used (i.e. glDrawArrays) then this
 347  * should be called with eltSize=0 and elements=NULL.
 348  *
 349  * \param draw  the drawing context
 350  * \param eltSize  size of each element (1, 2 or 4 bytes)
 351  * \param elements  the element buffer ptr
 352  */
 353 void
 354 draw_set_mapped_element_buffer_range( struct draw_context *draw,
 355                                       unsigned eltSize,
 356                                       unsigned min_index,
 357                                       unsigned max_index,
 358                                       void *elements )
 359 {
 360    draw->pt.user.elts = elements;
 361    draw->pt.user.eltSize = eltSize;
 362    draw->pt.user.min_index = min_index;
 363    draw->pt.user.max_index = max_index;
 364 }
 365
 366
 367 void
 368 draw_set_mapped_element_buffer( struct draw_context *draw,
 369                                 unsigned eltSize,
 370                                 void *elements )
 371 {
 372    draw->pt.user.elts = elements;
 373    draw->pt.user.eltSize = eltSize;
 374    draw->pt.user.min_index = 0;
 375    draw->pt.user.max_index = 0xffffffff;
 376 }
 377
 378
 379 /* Revamp me please:
 380  */
 381 void draw_do_flush( struct draw_context *draw, unsigned flags )
 382 {
 383    if (!draw->suspend_flushing)
 384    {
 385       assert(!draw->flushing); /* catch inadvertant recursion */
 386
 387       draw->flushing = TRUE;
 388
 389       draw_pipeline_flush( draw, flags );
 390
 391       draw->reduced_prim = ~0; /* is reduced_prim needed any more? */
 392
 393       draw->flushing = FALSE;
 394    }
 395 }