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_vs.h"
  38 #include "draw_gs.h"
  39
  40
  41 struct draw_context *draw_create( void )
  42 {
  43    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  44    if (draw == NULL)
  45       goto fail;
  46
  47    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
  48    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
  49    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
  50    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
  51    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
  52    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
  53    draw->nr_planes = 6;
  54
  55
  56    draw->reduced_prim = ~0; /* != any of PIPE_PRIM_x */
  57
  58
  59    if (!draw_pipeline_init( draw ))
  60       goto fail;
  61
  62    if (!draw_pt_init( draw ))
  63       goto fail;
  64
  65    if (!draw_vs_init( draw ))
  66       goto fail;
  67
  68    if (!draw_gs_init( draw ))
  69       goto fail;
  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    draw_gs_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  * Specify the Minimum Resolvable Depth factor for polygon offset.
 110  * This factor potentially depends on the number of Z buffer bits,
 111  * the rasterization algorithm and the arithmetic performed on Z
 112  * values between vertex shading and rasterization.  It will vary
 113  * from one driver to another.
 114  */
 115 void draw_set_mrd(struct draw_context *draw, double mrd)
 116 {
 117    draw->mrd = mrd;
 118 }
 119
 120
 121 /**
 122  * Register new primitive rasterization/rendering state.
 123  * This causes the drawing pipeline to be rebuilt.
 124  */
 125 void draw_set_rasterizer_state( struct draw_context *draw,
 126                                 const struct pipe_rasterizer_state *raster )
 127 {
 128    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 129
 130    draw->rasterizer = raster;
 131    draw->bypass_clipping =
 132       ((draw->rasterizer && draw->rasterizer->bypass_vs_clip_and_viewport) ||
 133        draw->driver.bypass_clipping);
 134 }
 135
 136
 137 void draw_set_driver_clipping( struct draw_context *draw,
 138                                boolean bypass_clipping )
 139 {
 140    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 141
 142    draw->driver.bypass_clipping = bypass_clipping;
 143    draw->bypass_clipping =
 144       ((draw->rasterizer && draw->rasterizer->bypass_vs_clip_and_viewport) ||
 145        draw->driver.bypass_clipping);
 146 }
 147
 148
 149 /**
 150  * Plug in the primitive rendering/rasterization stage (which is the last
 151  * stage in the drawing pipeline).
 152  * This is provided by the device driver.
 153  */
 154 void draw_set_rasterize_stage( struct draw_context *draw,
 155                                struct draw_stage *stage )
 156 {
 157    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 158
 159    draw->pipeline.rasterize = stage;
 160 }
 161
 162
 163 /**
 164  * Set the draw module's clipping state.
 165  */
 166 void draw_set_clip_state( struct draw_context *draw,
 167                           const struct pipe_clip_state *clip )
 168 {
 169    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 170
 171    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 172    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 173    draw->nr_planes = 6 + clip->nr;
 174 }
 175
 176
 177 /**
 178  * Set the draw module's viewport state.
 179  */
 180 void draw_set_viewport_state( struct draw_context *draw,
 181                               const struct pipe_viewport_state *viewport )
 182 {
 183    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 184    draw->viewport = *viewport; /* struct copy */
 185    draw->identity_viewport = (viewport->scale[0] == 1.0f &&
 186                               viewport->scale[1] == 1.0f &&
 187                               viewport->scale[2] == 1.0f &&
 188                               viewport->scale[3] == 1.0f &&
 189                               viewport->translate[0] == 0.0f &&
 190                               viewport->translate[1] == 0.0f &&
 191                               viewport->translate[2] == 0.0f &&
 192                               viewport->translate[3] == 0.0f);
 193
 194    draw_vs_set_viewport( draw, viewport );
 195 }
 196
 197
 198
 199 void
 200 draw_set_vertex_buffers(struct draw_context *draw,
 201                         unsigned count,
 202                         const struct pipe_vertex_buffer *buffers)
 203 {
 204    assert(count <= PIPE_MAX_ATTRIBS);
 205
 206    memcpy(draw->pt.vertex_buffer, buffers, count * sizeof(buffers[0]));
 207    draw->pt.nr_vertex_buffers = count;
 208 }
 209
 210
 211 void
 212 draw_set_vertex_elements(struct draw_context *draw,
 213                          unsigned count,
 214                          const struct pipe_vertex_element *elements)
 215 {
 216    assert(count <= PIPE_MAX_ATTRIBS);
 217
 218    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 219    draw->pt.nr_vertex_elements = count;
 220 }
 221
 222
 223 /**
 224  * Tell drawing context where to find mapped vertex buffers.
 225  */
 226 void
 227 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 228                               unsigned attr, const void *buffer)
 229 {
 230    draw->pt.user.vbuffer[attr] = buffer;
 231 }
 232
 233
 234 void
 235 draw_set_mapped_constant_buffer(struct draw_context *draw,
 236                                 unsigned shader_type,
 237                                 const void *buffer,
 238                                 unsigned size )
 239 {
 240    debug_assert(shader_type == PIPE_SHADER_VERTEX ||
 241                 shader_type == PIPE_SHADER_GEOMETRY);
 242    if (shader_type == PIPE_SHADER_VERTEX) {
 243       draw->pt.user.vs_constants = buffer;
 244       draw_vs_set_constants( draw, (const float (*)[4])buffer, size );
 245    } else if (shader_type == PIPE_SHADER_GEOMETRY) {
 246       draw->pt.user.gs_constants = buffer;
 247       draw_gs_set_constants( draw, (const float (*)[4])buffer, size );
 248    }
 249 }
 250
 251
 252 /**
 253  * Tells the draw module to draw points with triangles if their size
 254  * is greater than this threshold.
 255  */
 256 void
 257 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 258 {
 259    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 260    draw->pipeline.wide_point_threshold = threshold;
 261 }
 262
 263
 264 /**
 265  * Tells the draw module to draw lines with triangles if their width
 266  * is greater than this threshold.
 267  */
 268 void
 269 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 270 {
 271    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 272    draw->pipeline.wide_line_threshold = threshold;
 273 }
 274
 275
 276 /**
 277  * Tells the draw module whether or not to implement line stipple.
 278  */
 279 void
 280 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 281 {
 282    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 283    draw->pipeline.line_stipple = enable;
 284 }
 285
 286
 287 /**
 288  * Tells draw module whether to convert points to quads for sprite mode.
 289  */
 290 void
 291 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 292 {
 293    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 294    draw->pipeline.point_sprite = enable;
 295 }
 296
 297
 298 void
 299 draw_set_force_passthrough( struct draw_context *draw, boolean enable )
 300 {
 301    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 302    draw->force_passthrough = enable;
 303 }
 304
 305
 306 /**
 307  * Ask the draw module for the location/slot of the given vertex attribute in
 308  * a post-transformed vertex.
 309  *
 310  * With this function, drivers that use the draw module should have no reason
 311  * to track the current vertex/geometry shader.
 312  *
 313  * Note that the draw module may sometimes generate vertices with extra
 314  * attributes (such as texcoords for AA lines).  The driver can call this
 315  * function to find those attributes.
 316  *
 317  * Zero is returned if the attribute is not found since this is
 318  * a don't care / undefined situtation.  Returning -1 would be a bit more
 319  * work for the drivers.
 320  */
 321 int
 322 draw_find_shader_output(const struct draw_context *draw,
 323                         uint semantic_name, uint semantic_index)
 324 {
 325    const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
 326    const struct draw_geometry_shader *gs = draw->gs.geometry_shader;
 327    uint i;
 328    const struct tgsi_shader_info *info = &vs->info;
 329
 330    if (gs)
 331       info = &gs->info;
 332
 333    for (i = 0; i < info->num_outputs; i++) {
 334       if (info->output_semantic_name[i] == semantic_name &&
 335           info->output_semantic_index[i] == semantic_index)
 336          return i;
 337    }
 338
 339    /* XXX there may be more than one extra vertex attrib.
 340     * For example, simulated gl_FragCoord and gl_PointCoord.
 341     */
 342    if (draw->extra_shader_outputs.semantic_name == semantic_name &&
 343        draw->extra_shader_outputs.semantic_index == semantic_index) {
 344       return draw->extra_shader_outputs.slot;
 345    }
 346
 347    return 0;
 348 }
 349
 350
 351 /**
 352  * Return number of the shader outputs.
 353  *
 354  * If geometry shader is present, its output will be returned,
 355  * if not vertex shader is used.
 356  */
 357 uint
 358 draw_num_shader_outputs(const struct draw_context *draw)
 359 {
 360    uint count = draw->vs.vertex_shader->info.num_outputs;
 361
 362    /* if geometry shader is present, its outputs go to te
 363     * driver, not the vertex shaders */
 364    if (draw->gs.geometry_shader)
 365       count = draw->gs.geometry_shader->info.num_outputs;
 366
 367    if (draw->extra_shader_outputs.slot > 0)
 368       count++;
 369    return count;
 370 }
 371
 372
 373 /**
 374  * Provide TGSI sampler objects for vertex/geometry shaders that use texture fetches.
 375  * This might only be used by software drivers for the time being.
 376  */
 377 void
 378 draw_texture_samplers(struct draw_context *draw,
 379                       uint num_samplers,
 380                       struct tgsi_sampler **samplers)
 381 {
 382    draw->vs.num_samplers = num_samplers;
 383    draw->vs.samplers = samplers;
 384    draw->gs.num_samplers = num_samplers;
 385    draw->gs.samplers = samplers;
 386 }
 387
 388
 389
 390
 391 void draw_set_render( struct draw_context *draw,
 392                       struct vbuf_render *render )
 393 {
 394    draw->render = render;
 395 }
 396
 397
 398
 399 /**
 400  * Tell the drawing context about the index/element buffer to use
 401  * (ala glDrawElements)
 402  * If no element buffer is to be used (i.e. glDrawArrays) then this
 403  * should be called with eltSize=0 and elements=NULL.
 404  *
 405  * \param draw  the drawing context
 406  * \param eltSize  size of each element (1, 2 or 4 bytes)
 407  * \param elements  the element buffer ptr
 408  */
 409 void
 410 draw_set_mapped_element_buffer_range( struct draw_context *draw,
 411                                       unsigned eltSize,
 412                                       unsigned min_index,
 413                                       unsigned max_index,
 414                                       const void *elements )
 415 {
 416    draw->pt.user.elts = elements;
 417    draw->pt.user.eltSize = eltSize;
 418    draw->pt.user.min_index = min_index;
 419    draw->pt.user.max_index = max_index;
 420 }
 421
 422
 423 void
 424 draw_set_mapped_element_buffer( struct draw_context *draw,
 425                                 unsigned eltSize,
 426                                 const void *elements )
 427 {
 428    draw->pt.user.elts = elements;
 429    draw->pt.user.eltSize = eltSize;
 430    draw->pt.user.min_index = 0;
 431    draw->pt.user.max_index = 0xffffffff;
 432 }
 433
 434
 435 /* Revamp me please:
 436  */
 437 void draw_do_flush( struct draw_context *draw, unsigned flags )
 438 {
 439    if (!draw->suspend_flushing)
 440    {
 441       assert(!draw->flushing); /* catch inadvertant recursion */
 442
 443       draw->flushing = TRUE;
 444
 445       draw_pipeline_flush( draw, flags );
 446
 447       draw->reduced_prim = ~0; /* is reduced_prim needed any more? */
 448
 449       draw->flushing = FALSE;
 450    }
 451 }
 452
 453
 454 int draw_current_shader_outputs(struct draw_context *draw)
 455 {
 456    if (draw->gs.geometry_shader)
 457       return draw->gs.num_gs_outputs;
 458    return draw->vs.num_vs_outputs;
 459 }
 460
 461 int draw_current_shader_position_output(struct draw_context *draw)
 462 {
 463    if (draw->gs.geometry_shader)
 464       return draw->gs.position_output;
 465    return draw->vs.position_output;
 466 }