vbo_exec_draw.c revision 038d654bcb4e9d88eab420cefc3169d4845db4c9 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.2
4 *
5 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *    Keith Whitwell <keith@tungstengraphics.com>
26 */
27
28#include "main/glheader.h"
29#include "main/bufferobj.h"
30#include "main/compiler.h"
31#include "main/enums.h"
32#include "main/mfeatures.h"
33#include "main/state.h"
34
35#include "vbo_context.h"
36
37
38#if FEATURE_beginend
39
40
41static void
42vbo_exec_debug_verts( struct vbo_exec_context *exec )
43{
44   GLuint count = exec->vtx.vert_count;
45   GLuint i;
46
47   printf("%s: %u vertices %d primitives, %d vertsize\n",
48	  __FUNCTION__,
49	  count,
50	  exec->vtx.prim_count,
51	  exec->vtx.vertex_size);
52
53   for (i = 0 ; i < exec->vtx.prim_count ; i++) {
54      struct _mesa_prim *prim = &exec->vtx.prim[i];
55      printf("   prim %d: %s%s %d..%d %s %s\n",
56	     i,
57	     _mesa_lookup_prim_by_nr(prim->mode),
58	     prim->weak ? " (weak)" : "",
59	     prim->start,
60	     prim->start + prim->count,
61	     prim->begin ? "BEGIN" : "(wrap)",
62	     prim->end ? "END" : "(wrap)");
63   }
64}
65
66
67/*
68 * NOTE: Need to have calculated primitives by this point -- do it on the fly.
69 * NOTE: Old 'parity' issue is gone.
70 */
71static GLuint
72vbo_copy_vertices( struct vbo_exec_context *exec )
73{
74   GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
75   GLuint ovf, i;
76   GLuint sz = exec->vtx.vertex_size;
77   GLfloat *dst = exec->vtx.copied.buffer;
78   const GLfloat *src = (exec->vtx.buffer_map +
79                         exec->vtx.prim[exec->vtx.prim_count-1].start *
80                         exec->vtx.vertex_size);
81
82
83   switch (exec->ctx->Driver.CurrentExecPrimitive) {
84   case GL_POINTS:
85      return 0;
86   case GL_LINES:
87      ovf = nr&1;
88      for (i = 0 ; i < ovf ; i++)
89	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
90      return i;
91   case GL_TRIANGLES:
92      ovf = nr%3;
93      for (i = 0 ; i < ovf ; i++)
94	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
95      return i;
96   case GL_QUADS:
97      ovf = nr&3;
98      for (i = 0 ; i < ovf ; i++)
99	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
100      return i;
101   case GL_LINE_STRIP:
102      if (nr == 0) {
103	 return 0;
104      }
105      else {
106	 memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
107	 return 1;
108      }
109   case GL_LINE_LOOP:
110   case GL_TRIANGLE_FAN:
111   case GL_POLYGON:
112      if (nr == 0) {
113	 return 0;
114      }
115      else if (nr == 1) {
116	 memcpy( dst, src+0, sz * sizeof(GLfloat) );
117	 return 1;
118      }
119      else {
120	 memcpy( dst, src+0, sz * sizeof(GLfloat) );
121	 memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
122	 return 2;
123      }
124   case GL_TRIANGLE_STRIP:
125      /* no parity issue, but need to make sure the tri is not drawn twice */
126      if (nr & 1) {
127	 exec->vtx.prim[exec->vtx.prim_count-1].count--;
128      }
129      /* fallthrough */
130   case GL_QUAD_STRIP:
131      switch (nr) {
132      case 0:
133         ovf = 0;
134         break;
135      case 1:
136         ovf = 1;
137         break;
138      default:
139         ovf = 2 + (nr & 1);
140         break;
141      }
142      for (i = 0 ; i < ovf ; i++)
143	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
144      return i;
145   case PRIM_OUTSIDE_BEGIN_END:
146      return 0;
147   default:
148      assert(0);
149      return 0;
150   }
151}
152
153
154
155/* TODO: populate these as the vertex is defined:
156 */
157static void
158vbo_exec_bind_arrays( struct gl_context *ctx )
159{
160   struct vbo_context *vbo = vbo_context(ctx);
161   struct vbo_exec_context *exec = &vbo->exec;
162   struct gl_client_array *arrays = exec->vtx.arrays;
163   const GLuint count = exec->vtx.vert_count;
164   const GLuint *map;
165   GLuint attr;
166   GLbitfield varying_inputs = 0x0;
167
168   /* Install the default (ie Current) attributes first, then overlay
169    * all active ones.
170    */
171   switch (get_program_mode(exec->ctx)) {
172   case VP_NONE:
173      for (attr = 0; attr < 16; attr++) {
174         exec->vtx.inputs[attr] = &vbo->legacy_currval[attr];
175      }
176      for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
177         ASSERT(attr + 16 < Elements(exec->vtx.inputs));
178         exec->vtx.inputs[attr + 16] = &vbo->mat_currval[attr];
179      }
180      map = vbo->map_vp_none;
181      break;
182   case VP_NV:
183   case VP_ARB:
184      /* The aliasing of attributes for NV vertex programs has already
185       * occurred.  NV vertex programs cannot access material values,
186       * nor attributes greater than VERT_ATTRIB_TEX7.
187       */
188      for (attr = 0; attr < 16; attr++) {
189         exec->vtx.inputs[attr] = &vbo->legacy_currval[attr];
190         ASSERT(attr + 16 < Elements(exec->vtx.inputs));
191         exec->vtx.inputs[attr + 16] = &vbo->generic_currval[attr];
192      }
193      map = vbo->map_vp_arb;
194
195      /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
196       * In that case we effectively need to route the data from
197       * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
198       */
199      if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
200          (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
201         exec->vtx.inputs[16] = exec->vtx.inputs[0];
202         exec->vtx.attrsz[16] = exec->vtx.attrsz[0];
203         exec->vtx.attrptr[16] = exec->vtx.attrptr[0];
204         exec->vtx.attrsz[0] = 0;
205      }
206      break;
207   default:
208      assert(0);
209   }
210
211   /* Make all active attributes (including edgeflag) available as
212    * arrays of floats.
213    */
214   for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
215      const GLuint src = map[attr];
216
217      if (exec->vtx.attrsz[src]) {
218	 GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
219	    (GLbyte *)exec->vtx.vertex;
220
221         /* override the default array set above */
222         ASSERT(attr < Elements(exec->vtx.inputs));
223         ASSERT(attr < Elements(exec->vtx.arrays)); /* arrays[] */
224         exec->vtx.inputs[attr] = &arrays[attr];
225
226         if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
227            /* a real buffer obj: Ptr is an offset, not a pointer*/
228            assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
229            assert(offset >= 0);
230            arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->Offset + offset;
231         }
232         else {
233            /* Ptr into ordinary app memory */
234            arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
235         }
236	 arrays[attr].Size = exec->vtx.attrsz[src];
237	 arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
238	 arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
239	 arrays[attr].Type = GL_FLOAT;
240         arrays[attr].Format = GL_RGBA;
241	 arrays[attr].Enabled = 1;
242         arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
243         _mesa_reference_buffer_object(ctx,
244                                       &arrays[attr].BufferObj,
245                                       exec->vtx.bufferobj);
246	 arrays[attr]._MaxElement = count; /* ??? */
247
248         varying_inputs |= 1 << attr;
249         ctx->NewState |= _NEW_ARRAY;
250      }
251   }
252
253   _mesa_set_varying_vp_inputs( ctx, varying_inputs );
254}
255
256
257/**
258 * Unmap the VBO.  This is called before drawing.
259 */
260static void
261vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
262{
263   if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
264      struct gl_context *ctx = exec->ctx;
265
266      if (ctx->Driver.FlushMappedBufferRange) {
267         GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
268         GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);
269
270         if (length)
271            ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
272                                               exec->vtx.bufferobj);
273      }
274
275      exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
276                                exec->vtx.buffer_map) * sizeof(float);
277
278      assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
279      assert(exec->vtx.buffer_ptr != NULL);
280
281      ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
282      exec->vtx.buffer_map = NULL;
283      exec->vtx.buffer_ptr = NULL;
284      exec->vtx.max_vert = 0;
285   }
286}
287
288
289/**
290 * Map the vertex buffer to begin storing glVertex, glColor, etc data.
291 */
292void
293vbo_exec_vtx_map( struct vbo_exec_context *exec )
294{
295   struct gl_context *ctx = exec->ctx;
296   const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
297                              GL_MAP_INVALIDATE_RANGE_BIT |
298                              GL_MAP_UNSYNCHRONIZED_BIT |
299                              GL_MAP_FLUSH_EXPLICIT_BIT |
300                              MESA_MAP_NOWAIT_BIT;
301   const GLenum usage = GL_STREAM_DRAW_ARB;
302
303   if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
304      return;
305
306   assert(!exec->vtx.buffer_map);
307   assert(!exec->vtx.buffer_ptr);
308
309   if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
310      /* The VBO exists and there's room for more */
311      exec->vtx.buffer_map =
312         (GLfloat *)ctx->Driver.MapBufferRange(ctx,
313                                               exec->vtx.buffer_used,
314                                               (VBO_VERT_BUFFER_SIZE -
315                                                exec->vtx.buffer_used),
316                                               accessRange,
317                                               exec->vtx.bufferobj);
318      exec->vtx.buffer_ptr = exec->vtx.buffer_map;
319   }
320
321   if (!exec->vtx.buffer_map) {
322      /* Need to allocate a new VBO */
323      exec->vtx.buffer_used = 0;
324
325      ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
326                             VBO_VERT_BUFFER_SIZE,
327                             NULL, usage, exec->vtx.bufferobj);
328
329
330      exec->vtx.buffer_map =
331	 (GLfloat *)ctx->Driver.MapBufferRange(ctx,
332					       0, VBO_VERT_BUFFER_SIZE,
333					       accessRange,
334					       exec->vtx.bufferobj);
335      assert(exec->vtx.buffer_map);
336      exec->vtx.buffer_ptr = exec->vtx.buffer_map;
337   }
338
339   if (0)
340      printf("map %d..\n", exec->vtx.buffer_used);
341}
342
343
344
345/**
346 * Execute the buffer and save copied verts.
347 * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
348 */
349void
350vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
351{
352   if (0)
353      vbo_exec_debug_verts( exec );
354
355   if (exec->vtx.prim_count &&
356       exec->vtx.vert_count) {
357
358      exec->vtx.copied.nr = vbo_copy_vertices( exec );
359
360      if (exec->vtx.copied.nr != exec->vtx.vert_count) {
361	 struct gl_context *ctx = exec->ctx;
362
363	 /* Before the update_state() as this may raise _NEW_ARRAY
364          * from _mesa_set_varying_vp_inputs().
365	  */
366	 vbo_exec_bind_arrays( ctx );
367
368         if (ctx->NewState)
369            _mesa_update_state( ctx );
370
371         if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
372            vbo_exec_vtx_unmap( exec );
373         }
374
375         if (0)
376            printf("%s %d %d\n", __FUNCTION__, exec->vtx.prim_count,
377		   exec->vtx.vert_count);
378
379	 vbo_context(ctx)->draw_prims( ctx,
380				       exec->vtx.inputs,
381				       exec->vtx.prim,
382				       exec->vtx.prim_count,
383				       NULL,
384				       GL_TRUE,
385				       0,
386				       exec->vtx.vert_count - 1);
387
388	 /* If using a real VBO, get new storage -- unless asked not to.
389          */
390         if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
391            vbo_exec_vtx_map( exec );
392         }
393      }
394   }
395
396   /* May have to unmap explicitly if we didn't draw:
397    */
398   if (keepUnmapped &&
399       _mesa_is_bufferobj(exec->vtx.bufferobj) &&
400       exec->vtx.buffer_map) {
401      vbo_exec_vtx_unmap( exec );
402   }
403
404   if (keepUnmapped || exec->vtx.vertex_size == 0)
405      exec->vtx.max_vert = 0;
406   else
407      exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
408                            (exec->vtx.vertex_size * sizeof(GLfloat)));
409
410   exec->vtx.buffer_ptr = exec->vtx.buffer_map;
411   exec->vtx.prim_count = 0;
412   exec->vtx.vert_count = 0;
413}
414
415
416#endif /* FEATURE_beginend */
417