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