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    tgsi_exec_machine_init(&draw->machine);
  60
  61    /* FIXME: give this machine thing a proper constructor:
  62     */
  63    draw->machine.Inputs = align_malloc(PIPE_MAX_ATTRIBS * sizeof(struct tgsi_exec_vector), 16);
  64    draw->machine.Outputs = align_malloc(PIPE_MAX_ATTRIBS * sizeof(struct tgsi_exec_vector), 16);
  65
  66    if (!draw_pipeline_init( draw ))
  67       goto fail;
  68
  69    if (!draw_pt_init( draw ))
  70       goto fail;
  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    if (draw->machine.Inputs)
  87       align_free(draw->machine.Inputs);
  88
  89    if (draw->machine.Outputs)
  90       align_free(draw->machine.Outputs);
  91
  92    tgsi_exec_machine_free_data(&draw->machine);
  93
  94    /* Not so fast -- we're just borrowing this at the moment.
  95     *
  96    if (draw->render)
  97       draw->render->destroy( draw->render );
  98    */
  99
 100    draw_pipeline_destroy( draw );
 101    draw_pt_destroy( draw );
 102
 103    FREE( draw );
 104 }
 105
 106
 107
 108 void draw_flush( struct draw_context *draw )
 109 {
 110    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 111 }
 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_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 123
 124    draw->rasterizer = raster;
 125    draw->bypass_clipping =
 126       ((draw->rasterizer && draw->rasterizer->bypass_clipping) ||
 127        draw->driver.bypass_clipping);
 128 }
 129
 130
 131 void draw_set_driver_clipping( struct draw_context *draw,
 132                                boolean bypass_clipping )
 133 {
 134    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 135
 136    draw->driver.bypass_clipping = bypass_clipping;
 137    draw->bypass_clipping = (draw->rasterizer->bypass_clipping ||
 138                             draw->driver.bypass_clipping);
 139 }
 140
 141
 142 /**
 143  * Plug in the primitive rendering/rasterization stage (which is the last
 144  * stage in the drawing pipeline).
 145  * This is provided by the device driver.
 146  */
 147 void draw_set_rasterize_stage( struct draw_context *draw,
 148                                struct draw_stage *stage )
 149 {
 150    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 151
 152    draw->pipeline.rasterize = stage;
 153 }
 154
 155
 156 /**
 157  * Set the draw module's clipping state.
 158  */
 159 void draw_set_clip_state( struct draw_context *draw,
 160                           const struct pipe_clip_state *clip )
 161 {
 162    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 163
 164    assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
 165    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 166    draw->nr_planes = 6 + clip->nr;
 167 }
 168
 169
 170 /**
 171  * Set the draw module's viewport state.
 172  */
 173 void draw_set_viewport_state( struct draw_context *draw,
 174                               const struct pipe_viewport_state *viewport )
 175 {
 176    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 177    draw->viewport = *viewport; /* struct copy */
 178    draw->identity_viewport = (viewport->scale[0] == 1.0f &&
 179                               viewport->scale[1] == 1.0f &&
 180                               viewport->scale[2] == 1.0f &&
 181                               viewport->scale[3] == 1.0f &&
 182                               viewport->translate[0] == 0.0f &&
 183                               viewport->translate[1] == 0.0f &&
 184                               viewport->translate[2] == 0.0f &&
 185                               viewport->translate[3] == 0.0f);
 186 }
 187
 188
 189
 190 void
 191 draw_set_vertex_buffers(struct draw_context *draw,
 192                         unsigned count,
 193                         const struct pipe_vertex_buffer *buffers)
 194 {
 195    assert(count <= PIPE_MAX_ATTRIBS);
 196
 197    memcpy(draw->pt.vertex_buffer, buffers, count * sizeof(buffers[0]));
 198    draw->pt.nr_vertex_buffers = count;
 199 }
 200
 201
 202 void
 203 draw_set_vertex_elements(struct draw_context *draw,
 204                          unsigned count,
 205                          const struct pipe_vertex_element *elements)
 206 {
 207    assert(count <= PIPE_MAX_ATTRIBS);
 208
 209    memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
 210    draw->pt.nr_vertex_elements = count;
 211 }
 212
 213
 214 /**
 215  * Tell drawing context where to find mapped vertex buffers.
 216  */
 217 void
 218 draw_set_mapped_vertex_buffer(struct draw_context *draw,
 219                               unsigned attr, const void *buffer)
 220 {
 221    draw->pt.user.vbuffer[attr] = buffer;
 222 }
 223
 224
 225 void
 226 draw_set_mapped_constant_buffer(struct draw_context *draw,
 227                                 const void *buffer)
 228 {
 229    draw->pt.user.constants = buffer;
 230 }
 231
 232
 233 /**
 234  * Tells the draw module to draw points with triangles if their size
 235  * is greater than this threshold.
 236  */
 237 void
 238 draw_wide_point_threshold(struct draw_context *draw, float threshold)
 239 {
 240    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 241    draw->pipeline.wide_point_threshold = threshold;
 242 }
 243
 244
 245 /**
 246  * Tells the draw module to draw lines with triangles if their width
 247  * is greater than this threshold.
 248  */
 249 void
 250 draw_wide_line_threshold(struct draw_context *draw, float threshold)
 251 {
 252    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 253    draw->pipeline.wide_line_threshold = threshold;
 254 }
 255
 256
 257 /**
 258  * Tells the draw module whether or not to implement line stipple.
 259  */
 260 void
 261 draw_enable_line_stipple(struct draw_context *draw, boolean enable)
 262 {
 263    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 264    draw->pipeline.line_stipple = enable;
 265 }
 266
 267
 268 /**
 269  * Tells draw module whether to convert points to quads for sprite mode.
 270  */
 271 void
 272 draw_enable_point_sprites(struct draw_context *draw, boolean enable)
 273 {
 274    draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 275    draw->pipeline.point_sprite = enable;
 276 }
 277
 278
 279 /**
 280  * Ask the draw module for the location/slot of the given vertex attribute in
 281  * a post-transformed vertex.
 282  *
 283  * With this function, drivers that use the draw module should have no reason
 284  * to track the current vertex shader.
 285  *
 286  * Note that the draw module may sometimes generate vertices with extra
 287  * attributes (such as texcoords for AA lines).  The driver can call this
 288  * function to find those attributes.
 289  *
 290  * Zero is returned if the attribute is not found since this is
 291  * a don't care / undefined situtation.  Returning -1 would be a bit more
 292  * work for the drivers.
 293  */
 294 int
 295 draw_find_vs_output(struct draw_context *draw,
 296                     uint semantic_name, uint semantic_index)
 297 {
 298    const struct draw_vertex_shader *vs = draw->vertex_shader;
 299    uint i;
 300    for (i = 0; i < vs->info.num_outputs; i++) {
 301       if (vs->info.output_semantic_name[i] == semantic_name &&
 302           vs->info.output_semantic_index[i] == semantic_index)
 303          return i;
 304    }
 305
 306    /* XXX there may be more than one extra vertex attrib.
 307     * For example, simulated gl_FragCoord and gl_PointCoord.
 308     */
 309    if (draw->extra_vp_outputs.semantic_name == semantic_name &&
 310        draw->extra_vp_outputs.semantic_index == semantic_index) {
 311       return draw->extra_vp_outputs.slot;
 312    }
 313    return 0;
 314 }
 315
 316
 317 /**
 318  * Return number of vertex shader outputs.
 319  */
 320 uint
 321 draw_num_vs_outputs(struct draw_context *draw)
 322 {
 323    uint count = draw->vertex_shader->info.num_outputs;
 324    if (draw->extra_vp_outputs.slot > 0)
 325       count++;
 326    return count;
 327 }
 328
 329
 330
 331 void draw_set_render( struct draw_context *draw,
 332                       struct vbuf_render *render )
 333 {
 334    draw->render = render;
 335 }
 336
 337 void draw_set_edgeflags( struct draw_context *draw,
 338                          const unsigned *edgeflag )
 339 {
 340    draw->pt.user.edgeflag = edgeflag;
 341 }
 342
 343
 344
 345
 346 /**
 347  * Tell the drawing context about the index/element buffer to use
 348  * (ala glDrawElements)
 349  * If no element buffer is to be used (i.e. glDrawArrays) then this
 350  * should be called with eltSize=0 and elements=NULL.
 351  *
 352  * \param draw  the drawing context
 353  * \param eltSize  size of each element (1, 2 or 4 bytes)
 354  * \param elements  the element buffer ptr
 355  */
 356 void
 357 draw_set_mapped_element_buffer( struct draw_context *draw,
 358                                 unsigned eltSize, void *elements )
 359 {
 360    draw->pt.user.elts = elements;
 361    draw->pt.user.eltSize = eltSize;
 362 }
 363
 364
 365
 366 /* Revamp me please:
 367  */
 368 void draw_do_flush( struct draw_context *draw, unsigned flags )
 369 {
 370    if (!draw->flushing && !draw->vcache_flushing)
 371    {
 372       draw->flushing = TRUE;
 373
 374       draw_pipeline_flush( draw, flags );
 375
 376       draw->reduced_prim = ~0; /* is reduced_prim needed any more? */
 377
 378       draw->flushing = FALSE;
 379    }
 380 }