st_draw.c revision aa44efb04504fb6f8a1a2ff9d99388d173f7181a 
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#include "main/macros.h"
36#include "shader/prog_uniform.h"
37
38#include "vbo/vbo.h"
39
40#include "st_context.h"
41#include "st_atom.h"
42#include "st_cb_bufferobjects.h"
43#include "st_draw.h"
44#include "st_program.h"
45
46#include "pipe/p_context.h"
47#include "pipe/p_defines.h"
48#include "pipe/p_inlines.h"
49
50
51static GLuint double_types[4] = {
52   PIPE_FORMAT_R64_FLOAT,
53   PIPE_FORMAT_R64G64_FLOAT,
54   PIPE_FORMAT_R64G64B64_FLOAT,
55   PIPE_FORMAT_R64G64B64A64_FLOAT
56};
57
58static GLuint float_types[4] = {
59   PIPE_FORMAT_R32_FLOAT,
60   PIPE_FORMAT_R32G32_FLOAT,
61   PIPE_FORMAT_R32G32B32_FLOAT,
62   PIPE_FORMAT_R32G32B32A32_FLOAT
63};
64
65static GLuint uint_types_norm[4] = {
66   PIPE_FORMAT_R32_UNORM,
67   PIPE_FORMAT_R32G32_UNORM,
68   PIPE_FORMAT_R32G32B32_UNORM,
69   PIPE_FORMAT_R32G32B32A32_UNORM
70};
71
72static GLuint uint_types_scale[4] = {
73   PIPE_FORMAT_R32_USCALED,
74   PIPE_FORMAT_R32G32_USCALED,
75   PIPE_FORMAT_R32G32B32_USCALED,
76   PIPE_FORMAT_R32G32B32A32_USCALED
77};
78
79static GLuint int_types_norm[4] = {
80   PIPE_FORMAT_R32_SNORM,
81   PIPE_FORMAT_R32G32_SNORM,
82   PIPE_FORMAT_R32G32B32_SNORM,
83   PIPE_FORMAT_R32G32B32A32_SNORM
84};
85
86static GLuint int_types_scale[4] = {
87   PIPE_FORMAT_R32_SSCALED,
88   PIPE_FORMAT_R32G32_SSCALED,
89   PIPE_FORMAT_R32G32B32_SSCALED,
90   PIPE_FORMAT_R32G32B32A32_SSCALED
91};
92
93static GLuint ushort_types_norm[4] = {
94   PIPE_FORMAT_R16_UNORM,
95   PIPE_FORMAT_R16G16_UNORM,
96   PIPE_FORMAT_R16G16B16_UNORM,
97   PIPE_FORMAT_R16G16B16A16_UNORM
98};
99
100static GLuint ushort_types_scale[4] = {
101   PIPE_FORMAT_R16_USCALED,
102   PIPE_FORMAT_R16G16_USCALED,
103   PIPE_FORMAT_R16G16B16_USCALED,
104   PIPE_FORMAT_R16G16B16A16_USCALED
105};
106
107static GLuint short_types_norm[4] = {
108   PIPE_FORMAT_R16_SNORM,
109   PIPE_FORMAT_R16G16_SNORM,
110   PIPE_FORMAT_R16G16B16_SNORM,
111   PIPE_FORMAT_R16G16B16A16_SNORM
112};
113
114static GLuint short_types_scale[4] = {
115   PIPE_FORMAT_R16_SSCALED,
116   PIPE_FORMAT_R16G16_SSCALED,
117   PIPE_FORMAT_R16G16B16_SSCALED,
118   PIPE_FORMAT_R16G16B16A16_SSCALED
119};
120
121static GLuint ubyte_types_norm[4] = {
122   PIPE_FORMAT_R8_UNORM,
123   PIPE_FORMAT_R8G8_UNORM,
124   PIPE_FORMAT_R8G8B8_UNORM,
125   PIPE_FORMAT_R8G8B8A8_UNORM
126};
127
128static GLuint ubyte_types_scale[4] = {
129   PIPE_FORMAT_R8_USCALED,
130   PIPE_FORMAT_R8G8_USCALED,
131   PIPE_FORMAT_R8G8B8_USCALED,
132   PIPE_FORMAT_R8G8B8A8_USCALED
133};
134
135static GLuint byte_types_norm[4] = {
136   PIPE_FORMAT_R8_SNORM,
137   PIPE_FORMAT_R8G8_SNORM,
138   PIPE_FORMAT_R8G8B8_SNORM,
139   PIPE_FORMAT_R8G8B8A8_SNORM
140};
141
142static GLuint byte_types_scale[4] = {
143   PIPE_FORMAT_R8_SSCALED,
144   PIPE_FORMAT_R8G8_SSCALED,
145   PIPE_FORMAT_R8G8B8_SSCALED,
146   PIPE_FORMAT_R8G8B8A8_SSCALED
147};
148
149static GLuint fixed_types[4] = {
150   PIPE_FORMAT_R32_FIXED,
151   PIPE_FORMAT_R32G32_FIXED,
152   PIPE_FORMAT_R32G32B32_FIXED,
153   PIPE_FORMAT_R32G32B32A32_FIXED
154};
155
156
157
158/**
159 * Return a PIPE_FORMAT_x for the given GL datatype and size.
160 */
161GLuint
162st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
163                      GLboolean normalized)
164{
165   assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
166          type == GL_FIXED);
167   assert(size >= 1);
168   assert(size <= 4);
169   assert(format == GL_RGBA || format == GL_BGRA);
170
171   if (format == GL_BGRA) {
172      /* this is an odd-ball case */
173      assert(type == GL_UNSIGNED_BYTE);
174      assert(normalized);
175      return PIPE_FORMAT_B8G8R8A8_UNORM;
176   }
177
178   if (normalized) {
179      switch (type) {
180      case GL_DOUBLE: return double_types[size-1];
181      case GL_FLOAT: return float_types[size-1];
182      case GL_INT: return int_types_norm[size-1];
183      case GL_SHORT: return short_types_norm[size-1];
184      case GL_BYTE: return byte_types_norm[size-1];
185      case GL_UNSIGNED_INT: return uint_types_norm[size-1];
186      case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
187      case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
188      case GL_FIXED: return fixed_types[size-1];
189      default: assert(0); return 0;
190      }
191   }
192   else {
193      switch (type) {
194      case GL_DOUBLE: return double_types[size-1];
195      case GL_FLOAT: return float_types[size-1];
196      case GL_INT: return int_types_scale[size-1];
197      case GL_SHORT: return short_types_scale[size-1];
198      case GL_BYTE: return byte_types_scale[size-1];
199      case GL_UNSIGNED_INT: return uint_types_scale[size-1];
200      case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
201      case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
202      case GL_FIXED: return fixed_types[size-1];
203      default: assert(0); return 0;
204      }
205   }
206   return 0; /* silence compiler warning */
207}
208
209
210/*
211 * If edge flags are needed, setup an bitvector of flags and call
212 * pipe->set_edgeflags().
213 * XXX memleak: need to free the returned pointer at some point
214 */
215static void *
216setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
217                const struct gl_client_array *array)
218{
219   struct pipe_context *pipe = ctx->st->pipe;
220
221   if ((primMode == GL_TRIANGLES ||
222        primMode == GL_QUADS ||
223        primMode == GL_POLYGON) &&
224       (ctx->Polygon.FrontMode != GL_FILL ||
225        ctx->Polygon.BackMode != GL_FILL)) {
226      /* need edge flags */
227      GLint i;
228      unsigned *vec;
229      struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
230      ubyte *map;
231
232      if (!stobj || stobj->Base.Name == 0) {
233         /* edge flags are not in a VBO */
234         return NULL;
235      }
236
237      vec = (unsigned *) _mesa_calloc(sizeof(unsigned) * ((count + 31) / 32));
238      if (!vec)
239         return NULL;
240
241      map = pipe_buffer_map(pipe->screen, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
242      map = ADD_POINTERS(map, array->Ptr);
243
244      for (i = 0; i < count; i++) {
245         if (*((float *) map))
246            vec[i/32] |= 1 << (i % 32);
247
248         map += array->StrideB;
249      }
250
251      pipe_buffer_unmap(pipe->screen, stobj->buffer);
252
253      pipe->set_edgeflags(pipe, vec);
254
255      return vec;
256   }
257   else {
258      /* edge flags not needed */
259      pipe->set_edgeflags(pipe, NULL);
260      return NULL;
261   }
262}
263
264
265/**
266 * Examine the active arrays to determine if we have interleaved
267 * vertex arrays all living in one VBO, or all living in user space.
268 * \param userSpace  returns whether the arrays are in user space.
269 */
270static GLboolean
271is_interleaved_arrays(const struct st_vertex_program *vp,
272                      const struct gl_client_array **arrays,
273                      GLboolean *userSpace)
274{
275   GLuint attr;
276   const struct gl_buffer_object *firstBufObj = NULL;
277   GLint firstStride = -1;
278   GLuint num_client_arrays = 0;
279   const GLubyte *client_addr = NULL;
280
281   for (attr = 0; attr < vp->num_inputs; attr++) {
282      const GLuint mesaAttr = vp->index_to_input[attr];
283      const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
284      const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
285
286      if (firstStride < 0) {
287         firstStride = stride;
288      }
289      else if (firstStride != stride) {
290         return GL_FALSE;
291      }
292
293      if (!bufObj || !bufObj->Name) {
294         num_client_arrays++;
295         /* Try to detect if the client-space arrays are
296          * "close" to each other.
297          */
298         if (!client_addr) {
299            client_addr = arrays[mesaAttr]->Ptr;
300         }
301         else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
302            /* arrays start too far apart */
303            return GL_FALSE;
304         }
305      }
306      else if (!firstBufObj) {
307         firstBufObj = bufObj;
308      }
309      else if (bufObj != firstBufObj) {
310         return GL_FALSE;
311      }
312   }
313
314   *userSpace = (num_client_arrays == vp->num_inputs);
315   /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
316
317   return GL_TRUE;
318}
319
320
321/**
322 * Compute the memory range occupied by the arrays.
323 */
324static void
325get_arrays_bounds(const struct st_vertex_program *vp,
326                       const struct gl_client_array **arrays,
327                       GLuint max_index,
328                       const GLubyte **low, const GLubyte **high)
329{
330   const GLubyte *low_addr = NULL;
331   const GLubyte *high_addr = NULL;
332   GLuint attr;
333
334   for (attr = 0; attr < vp->num_inputs; attr++) {
335      const GLuint mesaAttr = vp->index_to_input[attr];
336      const GLint stride = arrays[mesaAttr]->StrideB;
337      const GLubyte *start = arrays[mesaAttr]->Ptr;
338      const unsigned sz = (arrays[mesaAttr]->Size *
339                           _mesa_sizeof_type(arrays[mesaAttr]->Type));
340      const GLubyte *end = start + (max_index * stride) + sz;
341
342      if (attr == 0) {
343         low_addr = start;
344         high_addr = end;
345      }
346      else {
347         low_addr = MIN2(low_addr, start);
348         high_addr = MAX2(high_addr, end);
349      }
350   }
351
352   *low = low_addr;
353   *high = high_addr;
354}
355
356
357/**
358 * Set up for drawing interleaved arrays that all live in one VBO
359 * or all live in user space.
360 * \param vbuffer  returns vertex buffer info
361 * \param velements  returns vertex element info
362 */
363static void
364setup_interleaved_attribs(GLcontext *ctx,
365                          const struct st_vertex_program *vp,
366                          const struct gl_client_array **arrays,
367                          GLuint max_index,
368                          GLboolean userSpace,
369                          struct pipe_vertex_buffer *vbuffer,
370                          struct pipe_vertex_element velements[])
371{
372   struct pipe_context *pipe = ctx->st->pipe;
373   GLuint attr;
374   const GLubyte *offset0 = NULL;
375
376   for (attr = 0; attr < vp->num_inputs; attr++) {
377      const GLuint mesaAttr = vp->index_to_input[attr];
378      struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
379      struct st_buffer_object *stobj = st_buffer_object(bufobj);
380      GLsizei stride = arrays[mesaAttr]->StrideB;
381
382      /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
383
384      if (attr == 0) {
385         const GLubyte *low, *high;
386
387         get_arrays_bounds(vp, arrays, max_index, &low, &high);
388         /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
389
390         offset0 = low;
391         if (userSpace) {
392            vbuffer->buffer =
393               pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
394            vbuffer->buffer_offset = 0;
395         }
396         else {
397            vbuffer->buffer = NULL;
398            pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
399            vbuffer->buffer_offset = pointer_to_offset(low);
400         }
401         vbuffer->stride = stride; /* in bytes */
402         vbuffer->max_index = max_index;
403      }
404
405      velements[attr].src_offset =
406         (unsigned) (arrays[mesaAttr]->Ptr - offset0);
407      velements[attr].vertex_buffer_index = 0;
408      velements[attr].nr_components = arrays[mesaAttr]->Size;
409      velements[attr].src_format =
410         st_pipe_vertex_format(arrays[mesaAttr]->Type,
411                               arrays[mesaAttr]->Size,
412                               arrays[mesaAttr]->Format,
413                               arrays[mesaAttr]->Normalized);
414      assert(velements[attr].src_format);
415   }
416}
417
418
419/**
420 * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
421 * vertex attribute.
422 * \param vbuffer  returns vertex buffer info
423 * \param velements  returns vertex element info
424 */
425static void
426setup_non_interleaved_attribs(GLcontext *ctx,
427                              const struct st_vertex_program *vp,
428                              const struct gl_client_array **arrays,
429                              GLuint max_index,
430                              GLboolean *userSpace,
431                              struct pipe_vertex_buffer vbuffer[],
432                              struct pipe_vertex_element velements[])
433{
434   struct pipe_context *pipe = ctx->st->pipe;
435   GLuint attr;
436
437   for (attr = 0; attr < vp->num_inputs; attr++) {
438      const GLuint mesaAttr = vp->index_to_input[attr];
439      struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
440      GLsizei stride = arrays[mesaAttr]->StrideB;
441
442      *userSpace = GL_FALSE;
443
444      if (bufobj && bufobj->Name) {
445         /* Attribute data is in a VBO.
446          * Recall that for VBOs, the gl_client_array->Ptr field is
447          * really an offset from the start of the VBO, not a pointer.
448          */
449         struct st_buffer_object *stobj = st_buffer_object(bufobj);
450         assert(stobj->buffer);
451         /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
452
453         vbuffer[attr].buffer = NULL;
454         pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
455         vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
456         velements[attr].src_offset = 0;
457      }
458      else {
459         /* attribute data is in user-space memory, not a VBO */
460         uint bytes;
461         /*printf("user-space array %d stride %d\n", attr, stride);*/
462
463         *userSpace = GL_TRUE;
464
465         /* wrap user data */
466         if (arrays[mesaAttr]->Ptr) {
467            /* user's vertex array */
468            if (arrays[mesaAttr]->StrideB) {
469               bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
470            }
471            else {
472               bytes = arrays[mesaAttr]->Size
473                  * _mesa_sizeof_type(arrays[mesaAttr]->Type);
474            }
475            vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
476                           (void *) arrays[mesaAttr]->Ptr, bytes);
477         }
478         else {
479            /* no array, use ctx->Current.Attrib[] value */
480            bytes = sizeof(ctx->Current.Attrib[0]);
481            vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
482                           (void *) ctx->Current.Attrib[mesaAttr], bytes);
483            stride = 0;
484         }
485
486         vbuffer[attr].buffer_offset = 0;
487         velements[attr].src_offset = 0;
488      }
489
490      assert(velements[attr].src_offset <= 2048); /* 11-bit field */
491
492      /* common-case setup */
493      vbuffer[attr].stride = stride; /* in bytes */
494      vbuffer[attr].max_index = max_index;
495      velements[attr].vertex_buffer_index = attr;
496      velements[attr].nr_components = arrays[mesaAttr]->Size;
497      velements[attr].src_format
498         = st_pipe_vertex_format(arrays[mesaAttr]->Type,
499                                 arrays[mesaAttr]->Size,
500                                 arrays[mesaAttr]->Format,
501                                 arrays[mesaAttr]->Normalized);
502      assert(velements[attr].src_format);
503   }
504}
505
506
507
508/**
509 * Prior to drawing, check that any uniforms referenced by the
510 * current shader have been set.  If a uniform has not been set,
511 * issue a warning.
512 */
513static void
514check_uniforms(GLcontext *ctx)
515{
516   const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
517   if (shProg && shProg->LinkStatus) {
518      GLuint i;
519      for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
520         const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
521         if (!u->Initialized) {
522            _mesa_warning(ctx,
523                          "Using shader with uninitialized uniform: %s",
524                          u->Name);
525         }
526      }
527   }
528}
529
530
531/**
532 * This function gets plugged into the VBO module and is called when
533 * we have something to render.
534 * Basically, translate the information into the format expected by gallium.
535 */
536void
537st_draw_vbo(GLcontext *ctx,
538            const struct gl_client_array **arrays,
539            const struct _mesa_prim *prims,
540            GLuint nr_prims,
541            const struct _mesa_index_buffer *ib,
542	    GLboolean index_bounds_valid,
543            GLuint min_index,
544            GLuint max_index)
545{
546   struct pipe_context *pipe = ctx->st->pipe;
547   const struct st_vertex_program *vp;
548   const struct pipe_shader_state *vs;
549   struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
550   GLuint attr;
551   struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
552   unsigned num_vbuffers, num_velements;
553   GLboolean userSpace = GL_FALSE;
554
555   /* Gallium probably doesn't want this in some cases. */
556   if (!index_bounds_valid)
557      vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
558
559   /* sanity check for pointer arithmetic below */
560   assert(sizeof(arrays[0]->Ptr[0]) == 1);
561
562   st_validate_state(ctx->st);
563
564   /* must get these after state validation! */
565   vp = ctx->st->vp;
566   vs = &ctx->st->vp->state;
567
568#if 0
569   if (MESA_VERBOSE & VERBOSE_GLSL) {
570      check_uniforms(ctx);
571   }
572#else
573   (void) check_uniforms;
574#endif
575
576   /*
577    * Setup the vbuffer[] and velements[] arrays.
578    */
579   if (is_interleaved_arrays(vp, arrays, &userSpace)) {
580      /*printf("Draw interleaved\n");*/
581      setup_interleaved_attribs(ctx, vp, arrays, max_index, userSpace,
582                                vbuffer, velements);
583      num_vbuffers = 1;
584      num_velements = vp->num_inputs;
585      if (num_velements == 0)
586         num_vbuffers = 0;
587   }
588   else {
589      /*printf("Draw non-interleaved\n");*/
590      setup_non_interleaved_attribs(ctx, vp, arrays, max_index,
591                                    &userSpace, vbuffer, velements);
592      num_vbuffers = vp->num_inputs;
593      num_velements = vp->num_inputs;
594   }
595
596#if 0
597   {
598      GLuint i;
599      for (i = 0; i < num_vbuffers; i++) {
600         printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
601         printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
602         printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
603         printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
604      }
605      for (i = 0; i < num_velements; i++) {
606         printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
607         printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
608         printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
609         printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
610      }
611   }
612#endif
613
614   pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
615   pipe->set_vertex_elements(pipe, num_velements, velements);
616
617   if (num_vbuffers == 0 || num_velements == 0)
618      return;
619
620   /* do actual drawing */
621   if (ib) {
622      /* indexed primitive */
623      struct gl_buffer_object *bufobj = ib->obj;
624      struct pipe_buffer *indexBuf = NULL;
625      unsigned indexSize, indexOffset, i;
626
627      switch (ib->type) {
628      case GL_UNSIGNED_INT:
629         indexSize = 4;
630         break;
631      case GL_UNSIGNED_SHORT:
632         indexSize = 2;
633         break;
634      case GL_UNSIGNED_BYTE:
635         indexSize = 1;
636         break;
637      default:
638         assert(0);
639	 return;
640      }
641
642      /* get/create the index buffer object */
643      if (bufobj && bufobj->Name) {
644         /* elements/indexes are in a real VBO */
645         struct st_buffer_object *stobj = st_buffer_object(bufobj);
646         pipe_buffer_reference(&indexBuf, stobj->buffer);
647         indexOffset = pointer_to_offset(ib->ptr) / indexSize;
648      }
649      else {
650         /* element/indicies are in user space memory */
651         indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
652                                            ib->count * indexSize);
653         indexOffset = 0;
654      }
655
656      /* draw */
657      if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
658         i = 0;
659
660         /* XXX: exercise temporary path to pass min/max directly
661          * through to driver & draw module.  These interfaces still
662          * need a bit of work...
663          */
664         setup_edgeflags(ctx, prims[i].mode,
665                         prims[i].start + indexOffset, prims[i].count,
666                         arrays[VERT_ATTRIB_EDGEFLAG]);
667
668         pipe->draw_range_elements(pipe, indexBuf, indexSize,
669                                   min_index,
670                                   max_index,
671                                   prims[i].mode,
672                                   prims[i].start + indexOffset, prims[i].count);
673      }
674      else {
675         for (i = 0; i < nr_prims; i++) {
676            setup_edgeflags(ctx, prims[i].mode,
677                            prims[i].start + indexOffset, prims[i].count,
678                            arrays[VERT_ATTRIB_EDGEFLAG]);
679
680            pipe->draw_elements(pipe, indexBuf, indexSize,
681                                prims[i].mode,
682                                prims[i].start + indexOffset, prims[i].count);
683         }
684      }
685
686      pipe_buffer_reference(&indexBuf, NULL);
687   }
688   else {
689      /* non-indexed */
690      GLuint i;
691      for (i = 0; i < nr_prims; i++) {
692         setup_edgeflags(ctx, prims[i].mode,
693                         prims[i].start, prims[i].count,
694                         arrays[VERT_ATTRIB_EDGEFLAG]);
695
696         pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
697      }
698   }
699
700   /* unreference buffers (frees wrapped user-space buffer objects) */
701   for (attr = 0; attr < num_vbuffers; attr++) {
702      pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
703      assert(!vbuffer[attr].buffer);
704   }
705
706   if (userSpace)
707   {
708      pipe->set_vertex_buffers(pipe, 0, NULL);
709   }
710}
711
712
713void st_init_draw( struct st_context *st )
714{
715   GLcontext *ctx = st->ctx;
716
717   vbo_set_draw_func(ctx, st_draw_vbo);
718}
719
720
721void st_destroy_draw( struct st_context *st )
722{
723}
724
725
726