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 "util/u_memory.h"
36#include "vbo.h"
37#include "vbo_private.h"
38
39
40static GLuint
41check_size(const GLfloat *attr)
42{
43   if (attr[3] != 1.0F)
44      return 4;
45   if (attr[2] != 0.0F)
46      return 3;
47   if (attr[1] != 0.0F)
48      return 2;
49   return 1;
50}
51
52
53/**
54 * Helper for initializing a vertex array.
55 */
56static void
57init_array(struct gl_context *ctx, struct gl_array_attributes *attrib,
58           unsigned size, const void *pointer)
59{
60   memset(attrib, 0, sizeof(*attrib));
61
62   vbo_set_vertex_format(&attrib->Format, size, GL_FLOAT);
63   attrib->Stride = 0;
64   attrib->Ptr = pointer;
65}
66
67
68/**
69 * Set up the vbo->currval arrays to point at the context's current
70 * vertex attributes (with strides = 0).
71 */
72static void
73init_legacy_currval(struct gl_context *ctx)
74{
75   struct vbo_context *vbo = vbo_context(ctx);
76
77   /* Set up a constant (Stride == 0) array for each current
78    * attribute:
79    */
80   for (int attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
81      if (VERT_BIT(attr) & VERT_BIT_GENERIC_ALL)
82         continue;
83
84      struct gl_array_attributes *attrib = &vbo->current[attr];
85
86      init_array(ctx, attrib, check_size(ctx->Current.Attrib[attr]),
87                 ctx->Current.Attrib[attr]);
88   }
89}
90
91
92static void
93init_generic_currval(struct gl_context *ctx)
94{
95   struct vbo_context *vbo = vbo_context(ctx);
96   GLuint i;
97
98   for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
99      const unsigned attr = VBO_ATTRIB_GENERIC0 + i;
100      struct gl_array_attributes *attrib = &vbo->current[attr];
101
102      init_array(ctx, attrib, 1, ctx->Current.Attrib[attr]);
103   }
104}
105
106
107static void
108init_mat_currval(struct gl_context *ctx)
109{
110   struct vbo_context *vbo = vbo_context(ctx);
111   GLuint i;
112
113   /* Set up a constant (StrideB == 0) array for each current
114    * attribute:
115    */
116   for (i = 0; i < MAT_ATTRIB_MAX; i++) {
117      const unsigned attr = VBO_ATTRIB_MAT_FRONT_AMBIENT + i;
118      struct gl_array_attributes *attrib = &vbo->current[attr];
119      unsigned size;
120
121      /* Size is fixed for the material attributes, for others will
122       * be determined at runtime:
123       */
124      switch (i) {
125      case MAT_ATTRIB_FRONT_SHININESS:
126      case MAT_ATTRIB_BACK_SHININESS:
127         size = 1;
128         break;
129      case MAT_ATTRIB_FRONT_INDEXES:
130      case MAT_ATTRIB_BACK_INDEXES:
131         size = 3;
132         break;
133      default:
134         size = 4;
135         break;
136      }
137
138      init_array(ctx, attrib, size, ctx->Light.Material.Attrib[i]);
139   }
140}
141
142
143void
144_vbo_install_exec_vtxfmt(struct gl_context *ctx)
145{
146   struct vbo_context *vbo = vbo_context(ctx);
147
148   _mesa_install_exec_vtxfmt(ctx, &vbo->exec.vtxfmt);
149}
150
151
152void
153vbo_exec_update_eval_maps(struct gl_context *ctx)
154{
155   struct vbo_context *vbo = vbo_context(ctx);
156
157   vbo->exec.eval.recalculate_maps = GL_TRUE;
158}
159
160
161GLboolean
162_vbo_CreateContext(struct gl_context *ctx, bool use_buffer_objects)
163{
164   struct vbo_context *vbo = &ctx->vbo_context;
165
166   memset(vbo, 0, sizeof(*vbo));
167
168   vbo->binding.Offset = 0;
169   vbo->binding.Stride = 0;
170   vbo->binding.InstanceDivisor = 0;
171
172   init_legacy_currval(ctx);
173   init_generic_currval(ctx);
174   init_mat_currval(ctx);
175
176   /* make sure all VBO_ATTRIB_ values can fit in an unsigned byte */
177   STATIC_ASSERT(VBO_ATTRIB_MAX <= 255);
178
179   /* Hook our functions into exec and compile dispatch tables.  These
180    * will pretty much be permanently installed, which means that the
181    * vtxfmt mechanism can be removed now.
182    */
183   vbo_exec_init(ctx, use_buffer_objects);
184   if (ctx->API == API_OPENGL_COMPAT)
185      vbo_save_init(ctx);
186
187   vbo->VAO = _mesa_new_vao(ctx, ~((GLuint)0));
188   /* The exec VAO assumes to have all arributes bound to binding 0 */
189   for (unsigned i = 0; i < VERT_ATTRIB_MAX; ++i)
190      _mesa_vertex_attrib_binding(ctx, vbo->VAO, i, 0);
191
192   _math_init_eval();
193
194   return GL_TRUE;
195}
196
197
198void
199_vbo_DestroyContext(struct gl_context *ctx)
200{
201   struct vbo_context *vbo = vbo_context(ctx);
202
203   if (vbo) {
204      _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj, NULL);
205
206      vbo_exec_destroy(ctx);
207      if (ctx->API == API_OPENGL_COMPAT)
208         vbo_save_destroy(ctx);
209      _mesa_reference_vao(ctx, &vbo->VAO, NULL);
210   }
211}
212
213
214const struct gl_array_attributes *
215_vbo_current_attrib(const struct gl_context *ctx, gl_vert_attrib attr)
216{
217   const struct vbo_context *vbo = vbo_context_const(ctx);
218   const gl_vertex_processing_mode vmp = ctx->VertexProgram._VPMode;
219   return &vbo->current[_vbo_attribute_alias_map[vmp][attr]];
220}
221
222
223const struct gl_vertex_buffer_binding *
224_vbo_current_binding(const struct gl_context *ctx)
225{
226   const struct vbo_context *vbo = vbo_context_const(ctx);
227   return &vbo->binding;
228}
229