src/mesa/vbo/vbo_context.c

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