vbo_exec_draw.c revision e97681c7f551a2a2a6bd5eff0f4192a870c816c0 
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/context.h"
31#include "main/enums.h"
32#include "main/state.h"
33#include "main/macros.h"
34
35#include "vbo_context.h"
36
37
38static void vbo_exec_debug_verts( struct vbo_exec_context *exec )
39{
40   GLuint count = exec->vtx.vert_count;
41   GLuint i;
42
43   _mesa_printf("%s: %u vertices %d primitives, %d vertsize\n",
44		__FUNCTION__,
45		count,
46		exec->vtx.prim_count,
47		exec->vtx.vertex_size);
48
49   for (i = 0 ; i < exec->vtx.prim_count ; i++) {
50      struct _mesa_prim *prim = &exec->vtx.prim[i];
51      _mesa_printf("   prim %d: %s%s %d..%d %s %s\n",
52		   i,
53		   _mesa_lookup_enum_by_nr(prim->mode),
54		   prim->weak ? " (weak)" : "",
55		   prim->start,
56		   prim->start + prim->count,
57		   prim->begin ? "BEGIN" : "(wrap)",
58		   prim->end ? "END" : "(wrap)");
59   }
60}
61
62
63/*
64 * NOTE: Need to have calculated primitives by this point -- do it on the fly.
65 * NOTE: Old 'parity' issue is gone.
66 */
67static GLuint vbo_copy_vertices( struct vbo_exec_context *exec )
68{
69   GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
70   GLuint ovf, i;
71   GLuint sz = exec->vtx.vertex_size;
72   GLfloat *dst = exec->vtx.copied.buffer;
73   GLfloat *src = ((GLfloat *)exec->vtx.buffer_map +
74		   exec->vtx.prim[exec->vtx.prim_count-1].start *
75		   exec->vtx.vertex_size);
76
77
78   switch( exec->ctx->Driver.CurrentExecPrimitive )
79   {
80   case GL_POINTS:
81      return 0;
82   case GL_LINES:
83      ovf = nr&1;
84      for (i = 0 ; i < ovf ; i++)
85	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
86      return i;
87   case GL_TRIANGLES:
88      ovf = nr%3;
89      for (i = 0 ; i < ovf ; i++)
90	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
91      return i;
92   case GL_QUADS:
93      ovf = nr&3;
94      for (i = 0 ; i < ovf ; i++)
95	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
96      return i;
97   case GL_LINE_STRIP:
98      if (nr == 0)
99	 return 0;
100      else {
101	 _mesa_memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
102	 return 1;
103      }
104   case GL_LINE_LOOP:
105   case GL_TRIANGLE_FAN:
106   case GL_POLYGON:
107      if (nr == 0)
108	 return 0;
109      else if (nr == 1) {
110	 _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
111	 return 1;
112      } else {
113	 _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
114	 _mesa_memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
115	 return 2;
116      }
117   case GL_TRIANGLE_STRIP:
118      /* no parity issue, but need to make sure the tri is not drawn twice */
119      if (nr & 1) {
120	 exec->vtx.prim[exec->vtx.prim_count-1].count--;
121      }
122      /* fallthrough */
123   case GL_QUAD_STRIP:
124      switch (nr) {
125      case 0: ovf = 0; break;
126      case 1: ovf = 1; break;
127      default: ovf = 2 + (nr&1); break;
128      }
129      for (i = 0 ; i < ovf ; i++)
130	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
131      return i;
132   case PRIM_OUTSIDE_BEGIN_END:
133      return 0;
134   default:
135      assert(0);
136      return 0;
137   }
138}
139
140
141
142/* TODO: populate these as the vertex is defined:
143 */
144static void vbo_exec_bind_arrays( GLcontext *ctx )
145{
146   struct vbo_context *vbo = vbo_context(ctx);
147   struct vbo_exec_context *exec = &vbo->exec;
148   struct gl_client_array *arrays = exec->vtx.arrays;
149   GLuint count = exec->vtx.vert_count;
150   GLubyte *data = exec->vtx.buffer_map;
151   const GLuint *map;
152   GLuint attr;
153   GLbitfield varying_inputs = 0x0;
154
155   /* Install the default (ie Current) attributes first, then overlay
156    * all active ones.
157    */
158   switch (get_program_mode(exec->ctx)) {
159   case VP_NONE:
160      for (attr = 0; attr < 16; attr++) {
161         exec->vtx.inputs[attr] = &vbo->legacy_currval[attr];
162      }
163      for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
164         exec->vtx.inputs[attr + 16] = &vbo->mat_currval[attr];
165      }
166      map = vbo->map_vp_none;
167      break;
168   case VP_NV:
169   case VP_ARB:
170      /* The aliasing of attributes for NV vertex programs has already
171       * occurred.  NV vertex programs cannot access material values,
172       * nor attributes greater than VERT_ATTRIB_TEX7.
173       */
174      for (attr = 0; attr < 16; attr++) {
175         exec->vtx.inputs[attr] = &vbo->legacy_currval[attr];
176         exec->vtx.inputs[attr + 16] = &vbo->generic_currval[attr];
177      }
178      map = vbo->map_vp_arb;
179
180      /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
181       * In that case we effectively need to route the data from
182       * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
183       */
184      if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
185          (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
186         exec->vtx.inputs[16] = exec->vtx.inputs[0];
187         exec->vtx.attrsz[16] = exec->vtx.attrsz[0];
188         exec->vtx.attrsz[0] = 0;
189      }
190      break;
191   default:
192      assert(0);
193   }
194
195   /* Make all active attributes (including edgeflag) available as
196    * arrays of floats.
197    */
198   for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
199      const GLuint src = map[attr];
200
201      if (exec->vtx.attrsz[src]) {
202         /* override the default array set above */
203         exec->vtx.inputs[attr] = &arrays[attr];
204
205         if (exec->vtx.bufferobj->Name) {
206            /* a real buffer obj: Ptr is an offset, not a pointer*/
207            int offset;
208            assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
209            offset = (GLbyte *) data - (GLbyte *) exec->vtx.bufferobj->Pointer;
210            assert(offset >= 0);
211            arrays[attr].Ptr = (void *) offset;
212         }
213         else {
214            /* Ptr into ordinary app memory */
215            arrays[attr].Ptr = (void *) data;
216         }
217	 arrays[attr].Size = exec->vtx.attrsz[src];
218	 arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
219	 arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
220	 arrays[attr].Type = GL_FLOAT;
221         arrays[attr].Format = GL_RGBA;
222	 arrays[attr].Enabled = 1;
223         _mesa_reference_buffer_object(ctx,
224                                       &arrays[attr].BufferObj,
225                                       exec->vtx.bufferobj);
226	 arrays[attr]._MaxElement = count; /* ??? */
227
228	 data += exec->vtx.attrsz[src] * sizeof(GLfloat);
229         varying_inputs |= 1<<attr;
230      }
231   }
232
233   _mesa_set_varying_vp_inputs( ctx, varying_inputs );
234}
235
236
237/**
238 * Execute the buffer and save copied verts.
239 */
240void vbo_exec_vtx_flush( struct vbo_exec_context *exec )
241{
242   if (0)
243      vbo_exec_debug_verts( exec );
244
245
246   if (exec->vtx.prim_count &&
247       exec->vtx.vert_count) {
248
249      exec->vtx.copied.nr = vbo_copy_vertices( exec );
250
251      if (exec->vtx.copied.nr != exec->vtx.vert_count) {
252	 GLcontext *ctx = exec->ctx;
253
254	 GLenum target = GL_ARRAY_BUFFER_ARB;
255	 GLenum access = GL_READ_WRITE_ARB;
256	 GLenum usage = GL_STREAM_DRAW_ARB;
257	 GLsizei size = VBO_VERT_BUFFER_SIZE * sizeof(GLfloat);
258
259	 /* Before the unmap (why?)
260	  */
261	 vbo_exec_bind_arrays( ctx );
262
263         if (ctx->NewState)
264            _mesa_update_state( ctx );
265
266         /* if using a real VBO, unmap it before drawing */
267         if (exec->vtx.bufferobj->Name) {
268            ctx->Driver.UnmapBuffer(ctx, target, exec->vtx.bufferobj);
269            exec->vtx.buffer_map = NULL;
270         }
271
272	 vbo_context(ctx)->draw_prims( ctx,
273				       exec->vtx.inputs,
274				       exec->vtx.prim,
275				       exec->vtx.prim_count,
276				       NULL,
277				       0,
278				       exec->vtx.vert_count - 1);
279
280	 /* If using a real VBO, get new storage */
281         if (exec->vtx.bufferobj->Name) {
282            ctx->Driver.BufferData(ctx, target, size, NULL, usage, exec->vtx.bufferobj);
283            exec->vtx.buffer_map =
284               ctx->Driver.MapBuffer(ctx, target, access, exec->vtx.bufferobj);
285         }
286      }
287   }
288
289   exec->vtx.prim_count = 0;
290   exec->vtx.vert_count = 0;
291   exec->vtx.vbptr = (GLfloat *)exec->vtx.buffer_map;
292}
293