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 #ifdef PIPE_ARCH_X86
  68    if (!draw_vs_init( draw ))
  69       goto fail;
  70 #endif
  71
  72    return draw;
  73
  74 fail:
  75    draw_destroy( draw );
  76    return NULL;
  77 }
  78
  79
  80 void draw_destroy( struct draw_context *draw )
  81 {
  82    if (!draw)
  83       return;
  84
  85
  86
  87    /* Not so fast -- we're just borrowing this at the moment.
  88     *
  89    if (draw->render)
  90       draw->render->destroy( draw->render );
  91    */
  92
  93    draw_pipeline_destroy( draw );
  94    draw_pt_destroy( draw );
  95    draw_vs_destroy( draw );
  96
  97    FREE( draw );
  98 }
  99
 100
 101
 102 void draw_flush( struct draw_context *draw )
 103 {
 104    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 105 }
 106
 107
 108
 109 /**
 110  * Register new primitive rasterization/rendering state.
 111  * This causes the drawing pipeline to be rebuilt.
 112  */
 113 void draw_set_rasterizer_state( struct draw_context *draw,
 114                                 const struct pipe_rasterizer_state *raster )
 115 {
 116    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 117
 118    draw->rasterizer = raster;
 119    draw->bypass_clipping =
 120       ((draw->rasterizer && draw->rasterizer->bypass_clipping) ||
 121        draw->driver.bypass_clipping);
 122 }
 123
 124
 125 void draw_set_driver_clipping( struct draw_context *draw,
 126                                boolean bypass_clipping )
 127 {
 128    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 129
 130    draw->driver.bypass_clipping = bypass_clipping;
 131    draw->bypass_clipping = (draw->rasterizer->bypass_clipping ||
 132                             draw->driver.bypass_clipping);
 133 }
 134
 135
 136 /**
 137  * Plug in the primitive rendering/rasterization stage (which is the last
 138  * stage in the drawing pipeline).
 139  * This is provided by the device driver.
 140  */
 141 void draw_set_rasterize_stage( struct draw_context *draw,
 142                                struct draw_stage *stage )
 143 {
 144    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 145
 146    draw->pipeline.rasterize = stage;
 147 }
 148
 149
 150 /**
 151  * Set the draw module's clipping state.
 152  */
 153 void draw_set_clip_state( struct draw_context *draw,
 154                           const struct pipe_clip_state *clip )
 155 {
 156    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 157
 158    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 159    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 160    draw->nr_planes = 6 + clip->nr;
 161 }
 162
 163
 164 /**
 165  * Set the draw module's viewport state.
 166  */
 167 void draw_set_viewport_state( struct draw_context *draw,
 168                               const struct pipe_viewport_state *viewport )
 169 {
 170    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 171    draw->viewport = *viewport; /* struct copy */
 172    draw->identity_viewport = (viewport->scale[0] == 1.0f &&
 173                               viewport->scale[1] == 1.0f &&
 174                               viewport->scale[2] == 1.0f &&
 175                               viewport->scale[3] == 1.0f &&
 176                               viewport->translate[0] == 0.0f &&
 177                               viewport->translate[1] == 0.0f &&
 178                               viewport->translate[2] == 0.0f &&
 179                               viewport->translate[3] == 0.0f);
 180
 181    draw_vs_set_viewport( draw, viewport );
 182 }
 183
 184
 185
 186 void
 187 draw_set_vertex_buffers(struct draw_context *draw,
 188                         unsigned count,
 189                         const struct pipe_vertex_buffer *buffers)
 190 {
 191    assert(count <= PIPE_MAX_ATTRIBS);
 192
 193    memcpy(draw->pt.vertex_buffer, buffers, count * sizeof(buffers[0]));
 194    draw->pt.nr_vertex_buffers = count;
 195 }
 196
 197
 198 void
 199 draw_set_vertex_elements(struct draw_context *draw,
 200                          unsigned count,
 201                          const struct pipe_vertex_element *elements)
 202 {
 203    assert(count <= PIPE_MAX_ATTRIBS);
 204
 205    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 206    draw->pt.nr_vertex_elements = count;
 207 }
 208
 209
 210 /**
 211  * Tell drawing context where to find mapped vertex buffers.
 212  */
 213 void
 214 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 215                               unsigned attr, const void *buffer)
 216 {
 217    draw->pt.user.vbuffer[attr] = buffer;
 218 }
 219
 220
 221 void
 222 draw_set_mapped_constant_buffer(struct draw_context *draw,
 223                                 const void *buffer,
 224                                 unsigned size )
 225 {
 226    draw->pt.user.constants = buffer;
 227    draw_vs_set_constants( draw, (const float (*)[4])buffer, size );
 228 }
 229
 230
 231 /**
 232  * Tells the draw module to draw points with triangles if their size
 233  * is greater than this threshold.
 234  */
 235 void
 236 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 237 {
 238    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 239    draw->pipeline.wide_point_threshold = threshold;
 240 }
 241
 242
 243 /**
 244  * Tells the draw module to draw lines with triangles if their width
 245  * is greater than this threshold.
 246  */
 247 void
 248 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 249 {
 250    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 251    draw->pipeline.wide_line_threshold = threshold;
 252 }
 253
 254
 255 /**
 256  * Tells the draw module whether or not to implement line stipple.
 257  */
 258 void
 259 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 260 {
 261    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 262    draw->pipeline.line_stipple = enable;
 263 }
 264
 265
 266 /**
 267  * Tells draw module whether to convert points to quads for sprite mode.
 268  */
 269 void
 270 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 271 {
 272    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 273    draw->pipeline.point_sprite = enable;
 274 }
 275
 276
 277 /**
 278  * Ask the draw module for the location/slot of the given vertex attribute in
 279  * a post-transformed vertex.
 280  *
 281  * With this function, drivers that use the draw module should have no reason
 282  * to track the current vertex shader.
 283  *
 284  * Note that the draw module may sometimes generate vertices with extra
 285  * attributes (such as texcoords for AA lines).  The driver can call this
 286  * function to find those attributes.
 287  *
 288  * Zero is returned if the attribute is not found since this is
 289  * a don't care / undefined situtation.  Returning -1 would be a bit more
 290  * work for the drivers.
 291  */
 292 int
 293 draw_find_vs_output(const struct draw_context *draw,
 294                     uint semantic_name, uint semantic_index)
 295 {
 296    const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
 297    uint i;
 298    for (i = 0; i < vs->info.num_outputs; i++) {
 299       if (vs->info.output_semantic_name[i] == semantic_name &&
 300           vs->info.output_semantic_index[i] == semantic_index)
 301          return i;
 302    }
 303
 304    /* XXX there may be more than one extra vertex attrib.
 305     * For example, simulated gl_FragCoord and gl_PointCoord.
 306     */
 307    if (draw->extra_vp_outputs.semantic_name == semantic_name &&
 308        draw->extra_vp_outputs.semantic_index == semantic_index) {
 309       return draw->extra_vp_outputs.slot;
 310    }
 311    return 0;
 312 }
 313
 314
 315 /**
 316  * Return number of vertex shader outputs.
 317  */
 318 uint
 319 draw_num_vs_outputs(const struct draw_context *draw)
 320 {
 321    uint count = draw->vs.vertex_shader->info.num_outputs;
 322    if (draw->extra_vp_outputs.slot > 0)
 323       count++;
 324    return count;
 325 }
 326
 327
 328
 329 void draw_set_render( struct draw_context *draw,
 330                       struct vbuf_render *render )
 331 {
 332    draw->render = render;
 333 }
 334
 335 void draw_set_edgeflags( struct draw_context *draw,
 336                          const unsigned *edgeflag )
 337 {
 338    draw->pt.user.edgeflag = edgeflag;
 339 }
 340
 341
 342
 343
 344 /**
 345  * Tell the drawing context about the index/element buffer to use
 346  * (ala glDrawElements)
 347  * If no element buffer is to be used (i.e. glDrawArrays) then this
 348  * should be called with eltSize=0 and elements=NULL.
 349  *
 350  * \param draw  the drawing context
 351  * \param eltSize  size of each element (1, 2 or 4 bytes)
 352  * \param elements  the element buffer ptr
 353  */
 354 void
 355 draw_set_mapped_element_buffer_range( struct draw_context *draw,
 356                                       unsigned eltSize,
 357                                       unsigned min_index,
 358                                       unsigned max_index,
 359                                       void *elements )
 360 {
 361    draw->pt.user.elts = elements;
 362    draw->pt.user.eltSize = eltSize;
 363    draw->pt.user.min_index = min_index;
 364    draw->pt.user.max_index = max_index;
 365 }
 366
 367
 368 void
 369 draw_set_mapped_element_buffer( struct draw_context *draw,
 370                                 unsigned eltSize,
 371                                 void *elements )
 372 {
 373    draw->pt.user.elts = elements;
 374    draw->pt.user.eltSize = eltSize;
 375    draw->pt.user.min_index = 0;
 376    draw->pt.user.max_index = 0xffffffff;
 377 }
 378
 379
 380 /* Revamp me please:
 381  */
 382 void draw_do_flush( struct draw_context *draw, unsigned flags )
 383 {
 384    if (!draw->suspend_flushing)
 385    {
 386       assert(!draw->flushing); /* catch inadvertant recursion */
 387
 388       draw->flushing = TRUE;
 389
 390       draw_pipeline_flush( draw, flags );
 391
 392       draw->reduced_prim = ~0; /* is reduced_prim needed any more? */
 393
 394       draw->flushing = FALSE;
 395    }
 396 }