vbo_exec_draw.c revision 7117f1b4 
1/*
2 * Mesa 3-D graphics library
3 * Version:  5.1
4 *
5 * Copyright (C) 1999-2003  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 "glheader.h"
29#include "context.h"
30#include "enums.h"
31#include "state.h"
32#include "macros.h"
33
34#include "vbo_context.h"
35
36
37static void vbo_exec_debug_verts( struct vbo_exec_context *exec )
38{
39   GLuint count = exec->vtx.vert_count;
40   GLuint i;
41
42   _mesa_printf("%s: %u vertices %d primitives, %d vertsize\n",
43		__FUNCTION__,
44		count,
45		exec->vtx.prim_count,
46		exec->vtx.vertex_size);
47
48   for (i = 0 ; i < exec->vtx.prim_count ; i++) {
49      struct _mesa_prim *prim = &exec->vtx.prim[i];
50      _mesa_printf("   prim %d: %s%s %d..%d %s %s\n",
51		   i,
52		   _mesa_lookup_enum_by_nr(prim->mode),
53		   prim->weak ? " (weak)" : "",
54		   prim->start,
55		   prim->start + prim->count,
56		   prim->begin ? "BEGIN" : "(wrap)",
57		   prim->end ? "END" : "(wrap)");
58   }
59}
60
61
62/*
63 * NOTE: Need to have calculated primitives by this point -- do it on the fly.
64 * NOTE: Old 'parity' issue is gone.
65 */
66static GLuint vbo_copy_vertices( struct vbo_exec_context *exec )
67{
68   GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
69   GLuint ovf, i;
70   GLuint sz = exec->vtx.vertex_size;
71   GLfloat *dst = exec->vtx.copied.buffer;
72   GLfloat *src = ((GLfloat *)exec->vtx.buffer_map +
73		   exec->vtx.prim[exec->vtx.prim_count-1].start *
74		   exec->vtx.vertex_size);
75
76
77   switch( exec->ctx->Driver.CurrentExecPrimitive )
78   {
79   case GL_POINTS:
80      return 0;
81   case GL_LINES:
82      ovf = nr&1;
83      for (i = 0 ; i < ovf ; i++)
84	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
85      return i;
86   case GL_TRIANGLES:
87      ovf = nr%3;
88      for (i = 0 ; i < ovf ; i++)
89	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
90      return i;
91   case GL_QUADS:
92      ovf = nr&3;
93      for (i = 0 ; i < ovf ; i++)
94	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
95      return i;
96   case GL_LINE_STRIP:
97      if (nr == 0)
98	 return 0;
99      else {
100	 _mesa_memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
101	 return 1;
102      }
103   case GL_LINE_LOOP:
104   case GL_TRIANGLE_FAN:
105   case GL_POLYGON:
106      if (nr == 0)
107	 return 0;
108      else if (nr == 1) {
109	 _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
110	 return 1;
111      } else {
112	 _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
113	 _mesa_memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
114	 return 2;
115      }
116   case GL_TRIANGLE_STRIP:
117      /* no parity issue, but need to make sure the tri is not drawn twice */
118      if (nr & 1) {
119	 exec->vtx.prim[exec->vtx.prim_count-1].count--;
120      }
121      /* fallthrough */
122   case GL_QUAD_STRIP:
123      switch (nr) {
124      case 0: ovf = 0; break;
125      case 1: ovf = 1; break;
126      default: ovf = 2 + (nr&1); break;
127      }
128      for (i = 0 ; i < ovf ; i++)
129	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
130      return i;
131   case GL_POLYGON+1:
132      return 0;
133   default:
134      assert(0);
135      return 0;
136   }
137}
138
139
140
141/* TODO: populate these as the vertex is defined:
142 */
143static void vbo_exec_bind_arrays( GLcontext *ctx )
144{
145   struct vbo_context *vbo = vbo_context(ctx);
146   struct vbo_exec_context *exec = &vbo->exec;
147   struct gl_client_array *arrays = exec->vtx.arrays;
148   GLuint count = exec->vtx.vert_count;
149   GLubyte *data = exec->vtx.buffer_map;
150   const GLuint *map;
151   GLuint attr;
152
153   /* Install the default (ie Current) attributes first, then overlay
154    * all active ones.
155    */
156   switch (get_program_mode(exec->ctx)) {
157   case VP_NONE:
158      memcpy(arrays,      vbo->legacy_currval, 16 * sizeof(arrays[0]));
159      memcpy(arrays + 16, vbo->mat_currval,    MAT_ATTRIB_MAX * sizeof(arrays[0]));
160      map = vbo->map_vp_none;
161      break;
162   case VP_NV:
163   case VP_ARB:
164      /* The aliasing of attributes for NV vertex programs has already
165       * occurred.  NV vertex programs cannot access material values,
166       * nor attributes greater than VERT_ATTRIB_TEX7.
167       */
168      memcpy(arrays,      vbo->legacy_currval,  16 * sizeof(arrays[0]));
169      memcpy(arrays + 16, vbo->generic_currval, 16 * sizeof(arrays[0]));
170      map = vbo->map_vp_arb;
171      break;
172   }
173
174   /* Make all active attributes (including edgeflag) available as
175    * arrays of floats.
176    */
177   for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
178      GLuint src = map[attr];
179
180      if (exec->vtx.attrsz[src]) {
181	 arrays[attr].Ptr = (void *)data;
182	 arrays[attr].Size = exec->vtx.attrsz[src];
183	 arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
184	 arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
185	 arrays[attr].Type = GL_FLOAT;
186	 arrays[attr].Enabled = 1;
187	 arrays[attr].BufferObj = exec->vtx.bufferobj; /* NullBufferObj */
188	 arrays[attr]._MaxElement = count; /* ??? */
189
190	 data += exec->vtx.attrsz[attr] * sizeof(GLfloat);
191      }
192   }
193}
194
195
196/**
197 * Execute the buffer and save copied verts.
198 */
199void vbo_exec_vtx_flush( struct vbo_exec_context *exec )
200{
201   if (0)
202      vbo_exec_debug_verts( exec );
203
204
205   if (exec->vtx.prim_count &&
206       exec->vtx.vert_count) {
207
208      exec->vtx.copied.nr = vbo_copy_vertices( exec );
209
210      if (exec->vtx.copied.nr != exec->vtx.vert_count) {
211	 GLcontext *ctx = exec->ctx;
212
213	 vbo_exec_bind_arrays( ctx );
214
215	 vbo_context(ctx)->draw_prims( ctx,
216				       exec->vtx.inputs,
217				       exec->vtx.prim,
218				       exec->vtx.prim_count,
219				       NULL,
220				       0,
221				       exec->vtx.vert_count - 1);
222      }
223   }
224
225   exec->vtx.prim_count = 0;
226   exec->vtx.vert_count = 0;
227   exec->vtx.vbptr = (GLfloat *)exec->vtx.buffer_map;
228}
229