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 "vbo.h"
  36 #include "vbo_private.h"
  37
  38
  39 static GLuint
  40 check_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  */
  55 static void
  56 init_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  */
  71 static void
  72 init_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
  90 static void
  91 init_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
 105 static void
 106 init_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
 141 void
 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
 150 void
 151 vbo_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
 161 GLboolean
 162 _vbo_CreateContext(struct gl_context *ctx, bool use_buffer_objects)
 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, use_buffer_objects);
 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
 199 void
 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
 218 const 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
 227 const 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 }