st_draw.c revision c31416971e4eac148f8e82d6c4392bd6f9cbc05d 
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#include "main/imports.h"
34#include "main/image.h"
35
36#include "vbo/vbo.h"
37
38#include "st_atom.h"
39#include "st_cache.h"
40#include "st_context.h"
41#include "st_cb_bufferobjects.h"
42#include "st_draw.h"
43#include "st_program.h"
44
45#include "pipe/p_context.h"
46#include "pipe/p_defines.h"
47#include "pipe/p_winsys.h"
48
49#include "pipe/draw/draw_private.h"
50#include "pipe/draw/draw_context.h"
51
52
53static GLuint double_types[4] = {
54   PIPE_FORMAT_R64_FLOAT,
55   PIPE_FORMAT_R64G64_FLOAT,
56   PIPE_FORMAT_R64G64B64_FLOAT,
57   PIPE_FORMAT_R64G64B64A64_FLOAT
58};
59
60static GLuint float_types[4] = {
61   PIPE_FORMAT_R32_FLOAT,
62   PIPE_FORMAT_R32G32_FLOAT,
63   PIPE_FORMAT_R32G32B32_FLOAT,
64   PIPE_FORMAT_R32G32B32A32_FLOAT
65};
66
67static GLuint uint_types_norm[4] = {
68   PIPE_FORMAT_R32_UNORM,
69   PIPE_FORMAT_R32G32_UNORM,
70   PIPE_FORMAT_R32G32B32_UNORM,
71   PIPE_FORMAT_R32G32B32A32_UNORM
72};
73
74static GLuint uint_types_scale[4] = {
75   PIPE_FORMAT_R32_USCALED,
76   PIPE_FORMAT_R32G32_USCALED,
77   PIPE_FORMAT_R32G32B32_USCALED,
78   PIPE_FORMAT_R32G32B32A32_USCALED
79};
80
81static GLuint int_types_norm[4] = {
82   PIPE_FORMAT_R32_SNORM,
83   PIPE_FORMAT_R32G32_SNORM,
84   PIPE_FORMAT_R32G32B32_SNORM,
85   PIPE_FORMAT_R32G32B32A32_SNORM
86};
87
88static GLuint int_types_scale[4] = {
89   PIPE_FORMAT_R32_SSCALED,
90   PIPE_FORMAT_R32G32_SSCALED,
91   PIPE_FORMAT_R32G32B32_SSCALED,
92   PIPE_FORMAT_R32G32B32A32_SSCALED
93};
94
95static GLuint ushort_types_norm[4] = {
96   PIPE_FORMAT_R16_UNORM,
97   PIPE_FORMAT_R16G16_UNORM,
98   PIPE_FORMAT_R16G16B16_UNORM,
99   PIPE_FORMAT_R16G16B16A16_UNORM
100};
101
102static GLuint ushort_types_scale[4] = {
103   PIPE_FORMAT_R16_USCALED,
104   PIPE_FORMAT_R16G16_USCALED,
105   PIPE_FORMAT_R16G16B16_USCALED,
106   PIPE_FORMAT_R16G16B16A16_USCALED
107};
108
109static GLuint short_types_norm[4] = {
110   PIPE_FORMAT_R16_SNORM,
111   PIPE_FORMAT_R16G16_SNORM,
112   PIPE_FORMAT_R16G16B16_SNORM,
113   PIPE_FORMAT_R16G16B16A16_SNORM
114};
115
116static GLuint short_types_scale[4] = {
117   PIPE_FORMAT_R16_SSCALED,
118   PIPE_FORMAT_R16G16_SSCALED,
119   PIPE_FORMAT_R16G16B16_SSCALED,
120   PIPE_FORMAT_R16G16B16A16_SSCALED
121};
122
123static GLuint ubyte_types_norm[4] = {
124   PIPE_FORMAT_R8_UNORM,
125   PIPE_FORMAT_R8G8_UNORM,
126   PIPE_FORMAT_R8G8B8_UNORM,
127   PIPE_FORMAT_R8G8B8A8_UNORM
128};
129
130static GLuint ubyte_types_scale[4] = {
131   PIPE_FORMAT_R8_USCALED,
132   PIPE_FORMAT_R8G8_USCALED,
133   PIPE_FORMAT_R8G8B8_USCALED,
134   PIPE_FORMAT_R8G8B8A8_USCALED
135};
136
137static GLuint byte_types_norm[4] = {
138   PIPE_FORMAT_R8_SNORM,
139   PIPE_FORMAT_R8G8_SNORM,
140   PIPE_FORMAT_R8G8B8_SNORM,
141   PIPE_FORMAT_R8G8B8A8_SNORM
142};
143
144static GLuint byte_types_scale[4] = {
145   PIPE_FORMAT_R8_SSCALED,
146   PIPE_FORMAT_R8G8_SSCALED,
147   PIPE_FORMAT_R8G8B8_SSCALED,
148   PIPE_FORMAT_R8G8B8A8_SSCALED
149};
150
151
152/**
153 * Return a PIPE_FORMAT_x for the given GL datatype and size.
154 */
155static GLuint
156pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
157{
158   assert(type >= GL_BYTE);
159   assert(type <= GL_DOUBLE);
160   assert(size >= 1);
161   assert(size <= 4);
162
163   if (normalized) {
164      switch (type) {
165      case GL_DOUBLE: return double_types[size-1];
166      case GL_FLOAT: return float_types[size-1];
167      case GL_INT: return int_types_norm[size-1];
168      case GL_SHORT: return short_types_norm[size-1];
169      case GL_BYTE: return byte_types_norm[size-1];
170      case GL_UNSIGNED_INT: return uint_types_norm[size-1];
171      case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
172      case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
173      default: assert(0); return 0;
174      }
175   }
176   else {
177      switch (type) {
178      case GL_DOUBLE: return double_types[size-1];
179      case GL_FLOAT: return float_types[size-1];
180      case GL_INT: return int_types_scale[size-1];
181      case GL_SHORT: return short_types_scale[size-1];
182      case GL_BYTE: return byte_types_scale[size-1];
183      case GL_UNSIGNED_INT: return uint_types_scale[size-1];
184      case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
185      case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
186      default: assert(0); return 0;
187      }
188   }
189   return 0; /* silence compiler warning */
190}
191
192
193/**
194 * The default attribute buffer is basically a copy of the
195 * ctx->Current.Attrib[] array.  It's used when the vertex program
196 * references an attribute for which we don't have a VBO/array.
197 */
198static void
199create_default_attribs_buffer(struct st_context *st)
200{
201   struct pipe_context *pipe = st->pipe;
202   /* XXX don't hardcode magic 32 here */
203   st->default_attrib_buffer = pipe->winsys->buffer_create( pipe->winsys, 32, 0, 0 );
204}
205
206
207static void
208destroy_default_attribs_buffer(struct st_context *st)
209{
210   struct pipe_context *pipe = st->pipe;
211   pipe->winsys->buffer_reference(pipe->winsys,
212                                  &st->default_attrib_buffer, NULL);
213}
214
215
216/**
217 * This function gets plugged into the VBO module and is called when
218 * we have something to render.
219 * Basically, translate the information into the format expected by pipe.
220 */
221void
222st_draw_vbo(GLcontext *ctx,
223            const struct gl_client_array **arrays,
224            const struct _mesa_prim *prims,
225            GLuint nr_prims,
226            const struct _mesa_index_buffer *ib,
227            GLuint min_index,
228            GLuint max_index)
229{
230   struct pipe_context *pipe = ctx->st->pipe;
231   struct pipe_winsys *winsys = pipe->winsys;
232   const struct st_vertex_program *vp;
233   const struct pipe_shader_state *vs;
234   struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
235   GLuint attr;
236
237   /* sanity check for pointer arithmetic below */
238   assert(sizeof(arrays[0]->Ptr[0]) == 1);
239
240   st_validate_state(ctx->st);
241
242   /* must get these after state validation! */
243   vp = ctx->st->vp;
244   vs = &ctx->st->state.vs->state;
245
246   /* loop over TGSI shader inputs to determine vertex buffer
247    * and attribute info
248    */
249   for (attr = 0; attr < vs->num_inputs; attr++) {
250      const GLuint mesaAttr = vp->index_to_input[attr];
251      struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
252      struct pipe_vertex_element velement;
253
254      if (bufobj && bufobj->Name) {
255         /* Attribute data is in a VBO.
256          * Recall that for VBOs, the gl_client_array->Ptr field is
257          * really an offset from the start of the VBO, not a pointer.
258          */
259         struct st_buffer_object *stobj = st_buffer_object(bufobj);
260         assert(stobj->buffer);
261
262         vbuffer[attr].buffer = NULL;
263         winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
264         vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
265         velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
266         assert(velement.src_offset <= 2048); /* 11-bit field */
267      }
268      else {
269         /* attribute data is in user-space memory, not a VBO */
270         uint bytes;
271
272         if (!arrays[mesaAttr]->StrideB) {
273            bytes = arrays[mesaAttr]->Size
274                    * _mesa_sizeof_type(arrays[mesaAttr]->Type);
275         } else {
276            bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
277         }
278
279         /* wrap user data */
280         vbuffer[attr].buffer
281            = winsys->user_buffer_create(winsys,
282                                         (void *) arrays[mesaAttr]->Ptr,
283                                         bytes);
284         vbuffer[attr].buffer_offset = 0;
285         velement.src_offset = 0;
286      }
287
288      /* common-case setup */
289      vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
290      vbuffer[attr].max_index = 0;  /* need this? */
291      velement.vertex_buffer_index = attr;
292      velement.nr_components = arrays[mesaAttr]->Size;
293      velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
294                                               arrays[mesaAttr]->Size,
295                                               arrays[mesaAttr]->Normalized);
296      assert(velement.src_format);
297
298      /* tell pipe about this attribute */
299      pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
300      pipe->set_vertex_element(pipe, attr, &velement);
301   }
302
303
304   /* do actual drawing */
305   if (ib) {
306      /* indexed primitive */
307      struct gl_buffer_object *bufobj = ib->obj;
308      struct pipe_buffer_handle *indexBuf = NULL;
309      unsigned indexSize, indexOffset, i;
310
311      switch (ib->type) {
312      case GL_UNSIGNED_INT:
313         indexSize = 4;
314         break;
315      case GL_UNSIGNED_SHORT:
316         indexSize = 2;
317         break;
318      case GL_UNSIGNED_BYTE:
319         indexSize = 1;
320         break;
321      default:
322         assert(0);
323      }
324
325      /* get/create the index buffer object */
326      if (bufobj && bufobj->Name) {
327         /* elements/indexes are in a real VBO */
328         struct st_buffer_object *stobj = st_buffer_object(bufobj);
329         winsys->buffer_reference(winsys, &indexBuf, stobj->buffer);
330         indexOffset = (unsigned) ib->ptr / indexSize;
331      }
332      else {
333         /* element/indicies are in user space memory */
334         indexBuf = winsys->user_buffer_create(winsys,
335                                               (void *) ib->ptr,
336                                               ib->count * indexSize);
337         indexOffset = 0;
338      }
339
340      /* draw */
341      for (i = 0; i < nr_prims; i++) {
342         pipe->draw_elements(pipe, indexBuf, indexSize,
343                             prims[i].mode,
344                             prims[i].start + indexOffset, prims[i].count);
345      }
346
347      winsys->buffer_reference(winsys, &indexBuf, NULL);
348   }
349   else {
350      /* non-indexed */
351      GLuint i;
352      for (i = 0; i < nr_prims; i++) {
353         pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
354      }
355   }
356
357   /* unreference buffers (frees wrapped user-space buffer objects) */
358   for (attr = 0; attr < vs->num_inputs; attr++) {
359      winsys->buffer_reference(winsys, &vbuffer[attr].buffer, NULL);
360      assert(!vbuffer[attr].buffer);
361      pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
362   }
363}
364
365
366
367/**
368 * Utility function for drawing simple primitives (such as quads for
369 * glClear and glDrawPixels).  Coordinates are in screen space.
370 * \param mode  one of PIPE_PRIM_x
371 * \param numVertex  number of vertices
372 * \param verts  vertex data (all attributes are float[4])
373 * \param numAttribs  number of attributes per vertex
374 */
375void
376st_draw_vertices(GLcontext *ctx, unsigned prim,
377                 unsigned numVertex, float *verts,
378                 unsigned numAttribs)
379{
380   const float width = ctx->DrawBuffer->Width;
381   const float height = ctx->DrawBuffer->Height;
382   const unsigned vertex_bytes = numVertex * numAttribs * 4 * sizeof(float);
383   struct pipe_context *pipe = ctx->st->pipe;
384   struct pipe_buffer_handle *vbuf;
385   struct pipe_vertex_buffer vbuffer;
386   struct pipe_vertex_element velement;
387   unsigned i;
388
389   assert(numAttribs > 0);
390
391   /* convert to clip coords */
392   for (i = 0; i < numVertex; i++) {
393      float x = verts[i * numAttribs * 4 + 0];
394      float y = verts[i * numAttribs * 4 + 1];
395      x = x / width * 2.0 - 1.0;
396      y = y / height * 2.0 - 1.0;
397      verts[i * numAttribs * 4 + 0] = x;
398      verts[i * numAttribs * 4 + 1] = y;
399   }
400
401   /* XXX create one-time */
402   vbuf = pipe->winsys->buffer_create(pipe->winsys, 32, 0, 0);
403   pipe->winsys->buffer_data(pipe->winsys, vbuf,
404                             vertex_bytes, verts,
405                             PIPE_BUFFER_USAGE_VERTEX);
406
407   /* tell pipe about the vertex buffer */
408   vbuffer.buffer = vbuf;
409   vbuffer.pitch = numAttribs * 4 * sizeof(float);  /* vertex size */
410   vbuffer.buffer_offset = 0;
411   pipe->set_vertex_buffer(pipe, 0, &vbuffer);
412
413   /* tell pipe about the vertex attributes */
414   for (i = 0; i < numAttribs; i++) {
415      velement.src_offset = i * 4 * sizeof(GLfloat);
416      velement.vertex_buffer_index = 0;
417      velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
418      velement.nr_components = 4;
419      pipe->set_vertex_element(pipe, i, &velement);
420   }
421
422   /* draw */
423   pipe->draw_arrays(pipe, prim, 0, numVertex);
424
425   /* XXX: do one-time */
426   pipe->winsys->buffer_reference(pipe->winsys, &vbuf, NULL);
427}
428
429
430/**
431 * Set the (private) draw module's post-transformed vertex format when in
432 * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
433 */
434static void
435set_feedback_vertex_format(GLcontext *ctx)
436{
437   struct st_context *st = ctx->st;
438   struct vertex_info vinfo;
439   GLuint i;
440
441   if (ctx->RenderMode == GL_SELECT) {
442      assert(ctx->RenderMode == GL_SELECT);
443      vinfo.num_attribs = 1;
444      vinfo.format[0] = FORMAT_4F;
445      vinfo.interp_mode[0] = INTERP_NONE;
446   }
447   else {
448      /* GL_FEEDBACK, or glRasterPos */
449      /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
450      vinfo.num_attribs = st->state.vs->state.num_outputs;
451      for (i = 0; i < vinfo.num_attribs; i++) {
452         vinfo.format[i] = FORMAT_4F;
453         vinfo.interp_mode[i] = INTERP_LINEAR;
454      }
455   }
456
457   draw_set_vertex_info(st->draw, &vinfo);
458}
459
460
461/**
462 * Called by VBO to draw arrays when in selection or feedback mode and
463 * to implement glRasterPos.
464 * This is very much like the normal draw_vbo() function above.
465 * Look at code refactoring some day.
466 * Might move this into the failover module some day.
467 */
468void
469st_feedback_draw_vbo(GLcontext *ctx,
470                     const struct gl_client_array **arrays,
471                     const struct _mesa_prim *prims,
472                     GLuint nr_prims,
473                     const struct _mesa_index_buffer *ib,
474                     GLuint min_index,
475                     GLuint max_index)
476{
477   struct st_context *st = ctx->st;
478   struct pipe_context *pipe = st->pipe;
479   struct draw_context *draw = st->draw;
480   struct pipe_winsys *winsys = pipe->winsys;
481   const struct st_vertex_program *vp;
482   const struct pipe_shader_state *vs;
483   struct pipe_buffer_handle *index_buffer_handle = 0;
484   struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
485   GLuint attr, i;
486   ubyte *mapped_constants;
487
488   assert(draw);
489
490   st_validate_state(ctx->st);
491
492   /* must get these after state validation! */
493   vp = ctx->st->vp;
494   vs = &ctx->st->state.vs->state;
495
496   /*
497    * Set up the draw module's state.
498    *
499    * We'd like to do this less frequently, but the normal state-update
500    * code sends state updates to the pipe, not to our private draw module.
501    */
502   assert(draw);
503   draw_set_viewport_state(draw, &st->state.viewport);
504   draw_set_clip_state(draw, &st->state.clip);
505   draw_set_rasterizer_state(draw, &st->state.rasterizer->state);
506   draw_bind_vertex_shader(draw, st->state.vs->data);
507   set_feedback_vertex_format(ctx);
508
509   /* loop over TGSI shader inputs to determine vertex buffer
510    * and attribute info
511    */
512   for (attr = 0; attr < vs->num_inputs; attr++) {
513      const GLuint mesaAttr = vp->index_to_input[attr];
514      struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
515      struct pipe_vertex_element velement;
516      void *map;
517
518      if (bufobj && bufobj->Name) {
519         /* Attribute data is in a VBO.
520          * Recall that for VBOs, the gl_client_array->Ptr field is
521          * really an offset from the start of the VBO, not a pointer.
522          */
523         struct st_buffer_object *stobj = st_buffer_object(bufobj);
524         assert(stobj->buffer);
525
526         vbuffer[attr].buffer = NULL;
527         winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
528         vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
529         velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
530      }
531      else {
532         /* attribute data is in user-space memory, not a VBO */
533         uint bytes = (arrays[mesaAttr]->Size
534                       * _mesa_sizeof_type(arrays[mesaAttr]->Type)
535                       * (max_index + 1));
536
537         /* wrap user data */
538         vbuffer[attr].buffer
539            = winsys->user_buffer_create(winsys,
540                                         (void *) arrays[mesaAttr]->Ptr,
541                                         bytes);
542         vbuffer[attr].buffer_offset = 0;
543         velement.src_offset = 0;
544      }
545
546      /* common-case setup */
547      vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
548      vbuffer[attr].max_index = 0;  /* need this? */
549      velement.vertex_buffer_index = attr;
550      velement.nr_components = arrays[mesaAttr]->Size;
551      velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
552                                               arrays[mesaAttr]->Size,
553                                               arrays[mesaAttr]->Normalized);
554      assert(velement.src_format);
555
556      /* tell draw about this attribute */
557      draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
558      draw_set_vertex_element(draw, attr, &velement);
559
560      /* map the attrib buffer */
561      map = pipe->winsys->buffer_map(pipe->winsys,
562                                     vbuffer[attr].buffer,
563                                     PIPE_BUFFER_FLAG_READ);
564      draw_set_mapped_vertex_buffer(draw, attr, map);
565   }
566
567   if (ib) {
568      unsigned indexSize;
569      struct gl_buffer_object *bufobj = ib->obj;
570      struct st_buffer_object *stobj = st_buffer_object(bufobj);
571      index_buffer_handle = stobj->buffer;
572      void *map;
573
574      switch (ib->type) {
575      case GL_UNSIGNED_INT:
576         indexSize = 4;
577         break;
578      case GL_UNSIGNED_SHORT:
579         indexSize = 2;
580         break;
581      default:
582         assert(0);
583      }
584
585      map = pipe->winsys->buffer_map(pipe->winsys,
586                                     index_buffer_handle,
587                                     PIPE_BUFFER_FLAG_READ);
588      draw_set_mapped_element_buffer(draw, indexSize, map);
589   }
590   else {
591      /* no index/element buffer */
592      draw_set_mapped_element_buffer(draw, 0, NULL);
593   }
594
595
596   /* map constant buffers */
597   mapped_constants = winsys->buffer_map(winsys,
598                               st->state.constants[PIPE_SHADER_VERTEX].buffer,
599                               PIPE_BUFFER_FLAG_READ);
600   draw_set_mapped_constant_buffer(st->draw, mapped_constants);
601
602
603   /* draw here */
604   for (i = 0; i < nr_prims; i++) {
605      draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
606   }
607
608
609   /* unmap constant buffers */
610   winsys->buffer_unmap(winsys, st->state.constants[PIPE_SHADER_VERTEX].buffer);
611
612   /*
613    * unmap vertex/index buffers
614    */
615   for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
616      if (draw->vertex_buffer[i].buffer) {
617         pipe->winsys->buffer_unmap(pipe->winsys,
618                                    draw->vertex_buffer[i].buffer);
619         draw_set_mapped_vertex_buffer(draw, i, NULL);
620      }
621   }
622   if (ib) {
623      pipe->winsys->buffer_unmap(pipe->winsys, index_buffer_handle);
624      draw_set_mapped_element_buffer(draw, 0, NULL);
625   }
626}
627
628
629
630void st_init_draw( struct st_context *st )
631{
632   GLcontext *ctx = st->ctx;
633
634   /* actually, not used here, but elsewhere */
635   create_default_attribs_buffer(st);
636
637   vbo_set_draw_func(ctx, st_draw_vbo);
638}
639
640
641void st_destroy_draw( struct st_context *st )
642{
643   destroy_default_attribs_buffer(st);
644}
645
646
647