vbo_context.c revision 8a1362ad 
1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2005  Brian Paul   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 "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *    Keith Whitwell <keithw@vmware.com>
26 */
27
28#include "main/errors.h"
29#include "main/bufferobj.h"
30#include "math/m_eval.h"
31#include "main/vtxfmt.h"
32#include "main/api_arrayelt.h"
33#include "main/arrayobj.h"
34#include "main/varray.h"
35#include "vbo.h"
36#include "vbo_private.h"
37
38
39static GLuint
40check_size(const GLfloat *attr)
41{
42   if (attr[3] != 1.0F)
43      return 4;
44   if (attr[2] != 0.0F)
45      return 3;
46   if (attr[1] != 0.0F)
47      return 2;
48   return 1;
49}
50
51
52/**
53 * Helper for initializing a vertex array.
54 */
55static void
56init_array(struct gl_context *ctx, struct gl_array_attributes *attrib,
57           unsigned size, const void *pointer)
58{
59   memset(attrib, 0, sizeof(*attrib));
60
61   vbo_set_vertex_format(&attrib->Format, size, GL_FLOAT);
62   attrib->Stride = 0;
63   attrib->Ptr = pointer;
64}
65
66
67/**
68 * Set up the vbo->currval arrays to point at the context's current
69 * vertex attributes (with strides = 0).
70 */
71static void
72init_legacy_currval(struct gl_context *ctx)
73{
74   struct vbo_context *vbo = vbo_context(ctx);
75   GLuint i;
76
77   /* Set up a constant (Stride == 0) array for each current
78    * attribute:
79    */
80   for (i = 0; i < VERT_ATTRIB_FF_MAX; i++) {
81      const unsigned attr = VERT_ATTRIB_FF(i);
82      struct gl_array_attributes *attrib = &vbo->current[attr];
83
84      init_array(ctx, attrib, check_size(ctx->Current.Attrib[attr]),
85                 ctx->Current.Attrib[attr]);
86   }
87}
88
89
90static void
91init_generic_currval(struct gl_context *ctx)
92{
93   struct vbo_context *vbo = vbo_context(ctx);
94   GLuint i;
95
96   for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
97      const unsigned attr = VBO_ATTRIB_GENERIC0 + i;
98      struct gl_array_attributes *attrib = &vbo->current[attr];
99
100      init_array(ctx, attrib, 1, ctx->Current.Attrib[attr]);
101   }
102}
103
104
105static void
106init_mat_currval(struct gl_context *ctx)
107{
108   struct vbo_context *vbo = vbo_context(ctx);
109   GLuint i;
110
111   /* Set up a constant (StrideB == 0) array for each current
112    * attribute:
113    */
114   for (i = 0; i < MAT_ATTRIB_MAX; i++) {
115      const unsigned attr = VBO_ATTRIB_MAT_FRONT_AMBIENT + i;
116      struct gl_array_attributes *attrib = &vbo->current[attr];
117      unsigned size;
118
119      /* Size is fixed for the material attributes, for others will
120       * be determined at runtime:
121       */
122      switch (i) {
123      case MAT_ATTRIB_FRONT_SHININESS:
124      case MAT_ATTRIB_BACK_SHININESS:
125         size = 1;
126         break;
127      case MAT_ATTRIB_FRONT_INDEXES:
128      case MAT_ATTRIB_BACK_INDEXES:
129         size = 3;
130         break;
131      default:
132         size = 4;
133         break;
134      }
135
136      init_array(ctx, attrib, size, ctx->Light.Material.Attrib[i]);
137   }
138}
139
140
141void
142_vbo_install_exec_vtxfmt(struct gl_context *ctx)
143{
144   struct vbo_context *vbo = vbo_context(ctx);
145
146   _mesa_install_exec_vtxfmt(ctx, &vbo->exec.vtxfmt);
147}
148
149
150void
151vbo_exec_invalidate_state(struct gl_context *ctx)
152{
153   struct vbo_context *vbo = vbo_context(ctx);
154   struct vbo_exec_context *exec = &vbo->exec;
155
156   if (ctx->NewState & _NEW_EVAL)
157      exec->eval.recalculate_maps = GL_TRUE;
158}
159
160
161GLboolean
162_vbo_CreateContext(struct gl_context *ctx)
163{
164   struct vbo_context *vbo = CALLOC_STRUCT(vbo_context);
165
166   ctx->vbo_context = vbo;
167
168   vbo->binding.Offset = 0;
169   vbo->binding.Stride = 0;
170   vbo->binding.InstanceDivisor = 0;
171   _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj,
172                                 ctx->Shared->NullBufferObj);
173   init_legacy_currval(ctx);
174   init_generic_currval(ctx);
175   init_mat_currval(ctx);
176
177   /* make sure all VBO_ATTRIB_ values can fit in an unsigned byte */
178   STATIC_ASSERT(VBO_ATTRIB_MAX <= 255);
179
180   /* Hook our functions into exec and compile dispatch tables.  These
181    * will pretty much be permanently installed, which means that the
182    * vtxfmt mechanism can be removed now.
183    */
184   vbo_exec_init(ctx);
185   if (ctx->API == API_OPENGL_COMPAT)
186      vbo_save_init(ctx);
187
188   vbo->VAO = _mesa_new_vao(ctx, ~((GLuint)0));
189   /* The exec VAO assumes to have all arributes bound to binding 0 */
190   for (unsigned i = 0; i < VERT_ATTRIB_MAX; ++i)
191      _mesa_vertex_attrib_binding(ctx, vbo->VAO, i, 0);
192
193   _math_init_eval();
194
195   return GL_TRUE;
196}
197
198
199void
200_vbo_DestroyContext(struct gl_context *ctx)
201{
202   struct vbo_context *vbo = vbo_context(ctx);
203
204   if (vbo) {
205
206      _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj, NULL);
207
208      vbo_exec_destroy(ctx);
209      if (ctx->API == API_OPENGL_COMPAT)
210         vbo_save_destroy(ctx);
211      _mesa_reference_vao(ctx, &vbo->VAO, NULL);
212      free(vbo);
213      ctx->vbo_context = NULL;
214   }
215}
216
217
218const struct gl_array_attributes *
219_vbo_current_attrib(const struct gl_context *ctx, gl_vert_attrib attr)
220{
221   const struct vbo_context *vbo = vbo_context_const(ctx);
222   const gl_vertex_processing_mode vmp = ctx->VertexProgram._VPMode;
223   return &vbo->current[_vbo_attribute_alias_map[vmp][attr]];
224}
225
226
227const struct gl_vertex_buffer_binding *
228_vbo_current_binding(const struct gl_context *ctx)
229{
230   const struct vbo_context *vbo = vbo_context_const(ctx);
231   return &vbo->binding;
232}
233