draw_context.c revision 82605d7bcd533d7c96cc619c45970efd7229dc3b 
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
42struct 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
60   if (!draw_pipeline_init( draw ))
61      goto fail;
62
63   if (!draw_pt_init( draw ))
64      goto fail;
65
66   if (!draw_vs_init( draw ))
67      goto fail;
68
69   return draw;
70
71fail:
72   draw_destroy( draw );
73   return NULL;
74}
75
76
77void draw_destroy( struct draw_context *draw )
78{
79   if (!draw)
80      return;
81
82
83
84   /* Not so fast -- we're just borrowing this at the moment.
85    *
86   if (draw->render)
87      draw->render->destroy( draw->render );
88   */
89
90   draw_pipeline_destroy( draw );
91   draw_pt_destroy( draw );
92   draw_vs_destroy( draw );
93
94   FREE( draw );
95}
96
97
98
99void draw_flush( struct draw_context *draw )
100{
101   draw_do_flush( draw, DRAW_FLUSH_BACKEND );
102}
103
104
105
106/**
107 * Register new primitive rasterization/rendering state.
108 * This causes the drawing pipeline to be rebuilt.
109 */
110void draw_set_rasterizer_state( struct draw_context *draw,
111                                const struct pipe_rasterizer_state *raster )
112{
113   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
114
115   draw->rasterizer = raster;
116   draw->bypass_clipping =
117      ((draw->rasterizer && draw->rasterizer->bypass_clipping) ||
118       draw->driver.bypass_clipping);
119}
120
121
122void draw_set_driver_clipping( struct draw_context *draw,
123                               boolean bypass_clipping )
124{
125   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
126
127   draw->driver.bypass_clipping = bypass_clipping;
128   draw->bypass_clipping = (draw->rasterizer->bypass_clipping ||
129                            draw->driver.bypass_clipping);
130}
131
132
133/**
134 * Plug in the primitive rendering/rasterization stage (which is the last
135 * stage in the drawing pipeline).
136 * This is provided by the device driver.
137 */
138void draw_set_rasterize_stage( struct draw_context *draw,
139                               struct draw_stage *stage )
140{
141   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
142
143   draw->pipeline.rasterize = stage;
144}
145
146
147/**
148 * Set the draw module's clipping state.
149 */
150void draw_set_clip_state( struct draw_context *draw,
151                          const struct pipe_clip_state *clip )
152{
153   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
154
155   assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
156   memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
157   draw->nr_planes = 6 + clip->nr;
158}
159
160
161/**
162 * Set the draw module's viewport state.
163 */
164void draw_set_viewport_state( struct draw_context *draw,
165                              const struct pipe_viewport_state *viewport )
166{
167   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
168   draw->viewport = *viewport; /* struct copy */
169   draw->identity_viewport = (viewport->scale[0] == 1.0f &&
170                              viewport->scale[1] == 1.0f &&
171                              viewport->scale[2] == 1.0f &&
172                              viewport->scale[3] == 1.0f &&
173                              viewport->translate[0] == 0.0f &&
174                              viewport->translate[1] == 0.0f &&
175                              viewport->translate[2] == 0.0f &&
176                              viewport->translate[3] == 0.0f);
177
178   draw_vs_set_viewport( draw, viewport );
179}
180
181
182
183void
184draw_set_vertex_buffers(struct draw_context *draw,
185                        unsigned count,
186                        const struct pipe_vertex_buffer *buffers)
187{
188   assert(count <= PIPE_MAX_ATTRIBS);
189
190   memcpy(draw->pt.vertex_buffer, buffers, count * sizeof(buffers[0]));
191   draw->pt.nr_vertex_buffers = count;
192}
193
194
195void
196draw_set_vertex_elements(struct draw_context *draw,
197                         unsigned count,
198                         const struct pipe_vertex_element *elements)
199{
200   assert(count <= PIPE_MAX_ATTRIBS);
201
202   memcpy(draw->pt.vertex_element, elements, count * sizeof(elements[0]));
203   draw->pt.nr_vertex_elements = count;
204}
205
206
207/**
208 * Tell drawing context where to find mapped vertex buffers.
209 */
210void
211draw_set_mapped_vertex_buffer(struct draw_context *draw,
212                              unsigned attr, const void *buffer)
213{
214   draw->pt.user.vbuffer[attr] = buffer;
215}
216
217
218void
219draw_set_mapped_constant_buffer(struct draw_context *draw,
220                                const void *buffer)
221{
222   draw->pt.user.constants = buffer;
223   draw_vs_set_constants( draw, (const float (*)[4])buffer );
224}
225
226
227/**
228 * Tells the draw module to draw points with triangles if their size
229 * is greater than this threshold.
230 */
231void
232draw_wide_point_threshold(struct draw_context *draw, float threshold)
233{
234   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
235   draw->pipeline.wide_point_threshold = threshold;
236}
237
238
239/**
240 * Tells the draw module to draw lines with triangles if their width
241 * is greater than this threshold.
242 */
243void
244draw_wide_line_threshold(struct draw_context *draw, float threshold)
245{
246   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
247   draw->pipeline.wide_line_threshold = threshold;
248}
249
250
251/**
252 * Tells the draw module whether or not to implement line stipple.
253 */
254void
255draw_enable_line_stipple(struct draw_context *draw, boolean enable)
256{
257   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
258   draw->pipeline.line_stipple = enable;
259}
260
261
262/**
263 * Tells draw module whether to convert points to quads for sprite mode.
264 */
265void
266draw_enable_point_sprites(struct draw_context *draw, boolean enable)
267{
268   draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
269   draw->pipeline.point_sprite = enable;
270}
271
272
273/**
274 * Ask the draw module for the location/slot of the given vertex attribute in
275 * a post-transformed vertex.
276 *
277 * With this function, drivers that use the draw module should have no reason
278 * to track the current vertex shader.
279 *
280 * Note that the draw module may sometimes generate vertices with extra
281 * attributes (such as texcoords for AA lines).  The driver can call this
282 * function to find those attributes.
283 *
284 * Zero is returned if the attribute is not found since this is
285 * a don't care / undefined situtation.  Returning -1 would be a bit more
286 * work for the drivers.
287 */
288int
289draw_find_vs_output(struct draw_context *draw,
290                    uint semantic_name, uint semantic_index)
291{
292   const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
293   uint i;
294   for (i = 0; i < vs->info.num_outputs; i++) {
295      if (vs->info.output_semantic_name[i] == semantic_name &&
296          vs->info.output_semantic_index[i] == semantic_index)
297         return i;
298   }
299
300   /* XXX there may be more than one extra vertex attrib.
301    * For example, simulated gl_FragCoord and gl_PointCoord.
302    */
303   if (draw->extra_vp_outputs.semantic_name == semantic_name &&
304       draw->extra_vp_outputs.semantic_index == semantic_index) {
305      return draw->extra_vp_outputs.slot;
306   }
307   return 0;
308}
309
310
311/**
312 * Return number of vertex shader outputs.
313 */
314uint
315draw_num_vs_outputs(struct draw_context *draw)
316{
317   uint count = draw->vs.vertex_shader->info.num_outputs;
318   if (draw->extra_vp_outputs.slot > 0)
319      count++;
320   return count;
321}
322
323
324
325void draw_set_render( struct draw_context *draw,
326		      struct vbuf_render *render )
327{
328   draw->render = render;
329}
330
331void draw_set_edgeflags( struct draw_context *draw,
332                         const unsigned *edgeflag )
333{
334   draw->pt.user.edgeflag = edgeflag;
335}
336
337
338
339
340/**
341 * Tell the drawing context about the index/element buffer to use
342 * (ala glDrawElements)
343 * If no element buffer is to be used (i.e. glDrawArrays) then this
344 * should be called with eltSize=0 and elements=NULL.
345 *
346 * \param draw  the drawing context
347 * \param eltSize  size of each element (1, 2 or 4 bytes)
348 * \param elements  the element buffer ptr
349 */
350void
351draw_set_mapped_element_buffer_range( struct draw_context *draw,
352                                      unsigned eltSize,
353                                      unsigned min_index,
354                                      unsigned max_index,
355                                      void *elements )
356{
357   draw->pt.user.elts = elements;
358   draw->pt.user.eltSize = eltSize;
359   draw->pt.user.min_index = min_index;
360   draw->pt.user.max_index = max_index;
361}
362
363
364void
365draw_set_mapped_element_buffer( struct draw_context *draw,
366                                unsigned eltSize,
367                                void *elements )
368{
369   draw->pt.user.elts = elements;
370   draw->pt.user.eltSize = eltSize;
371   draw->pt.user.min_index = 0;
372   draw->pt.user.max_index = 0xffffffff;
373}
374
375
376/* Revamp me please:
377 */
378void draw_do_flush( struct draw_context *draw, unsigned flags )
379{
380   if (!draw->suspend_flushing)
381   {
382      assert(!draw->flushing); /* catch inadvertant recursion */
383
384      draw->flushing = TRUE;
385
386      draw_pipeline_flush( draw, flags );
387
388      draw->reduced_prim = ~0; /* is reduced_prim needed any more? */
389
390      draw->flushing = FALSE;
391   }
392}
393