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