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/mtypes.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    attrib->Size = size;
  62    attrib->Type = GL_FLOAT;
  63    attrib->Format = GL_RGBA;
  64    attrib->Stride = 0;
  65    attrib->_ElementSize = size * sizeof(GLfloat);
  66    attrib->Ptr = pointer;
  67 }
  68
  69
  70 /**
  71  * Set up the vbo->currval arrays to point at the context's current
  72  * vertex attributes (with strides = 0).
  73  */
  74 static void
  75 init_legacy_currval(struct gl_context *ctx)
  76 {
  77    struct vbo_context *vbo = vbo_context(ctx);
  78    GLuint i;
  79
  80    /* Set up a constant (Stride == 0) array for each current
  81     * attribute:
  82     */
  83    for (i = 0; i < VERT_ATTRIB_FF_MAX; i++) {
  84       const unsigned attr = VERT_ATTRIB_FF(i);
  85       struct gl_array_attributes *attrib = &vbo->current[attr];
  86
  87       init_array(ctx, attrib, check_size(ctx->Current.Attrib[attr]),
  88                  ctx->Current.Attrib[attr]);
  89    }
  90 }
  91
  92
  93 static void
  94 init_generic_currval(struct gl_context *ctx)
  95 {
  96    struct vbo_context *vbo = vbo_context(ctx);
  97    GLuint i;
  98
  99    for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
 100       const unsigned attr = VBO_ATTRIB_GENERIC0 + i;
 101       struct gl_array_attributes *attrib = &vbo->current[attr];
 102
 103       init_array(ctx, attrib, 1, ctx->Current.Attrib[attr]);
 104    }
 105 }
 106
 107
 108 static void
 109 init_mat_currval(struct gl_context *ctx)
 110 {
 111    struct vbo_context *vbo = vbo_context(ctx);
 112    GLuint i;
 113
 114    /* Set up a constant (StrideB == 0) array for each current
 115     * attribute:
 116     */
 117    for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 118       const unsigned attr = VBO_ATTRIB_MAT_FRONT_AMBIENT + i;
 119       struct gl_array_attributes *attrib = &vbo->current[attr];
 120       unsigned size;
 121
 122       /* Size is fixed for the material attributes, for others will
 123        * be determined at runtime:
 124        */
 125       switch (i) {
 126       case MAT_ATTRIB_FRONT_SHININESS:
 127       case MAT_ATTRIB_BACK_SHININESS:
 128          size = 1;
 129          break;
 130       case MAT_ATTRIB_FRONT_INDEXES:
 131       case MAT_ATTRIB_BACK_INDEXES:
 132          size = 3;
 133          break;
 134       default:
 135          size = 4;
 136          break;
 137       }
 138
 139       init_array(ctx, attrib, size, ctx->Light.Material.Attrib[i]);
 140    }
 141 }
 142
 143
 144 void
 145 _vbo_install_exec_vtxfmt(struct gl_context *ctx)
 146 {
 147    struct vbo_context *vbo = vbo_context(ctx);
 148
 149    _mesa_install_exec_vtxfmt(ctx, &vbo->exec.vtxfmt);
 150 }
 151
 152
 153 void
 154 vbo_exec_invalidate_state(struct gl_context *ctx)
 155 {
 156    struct vbo_context *vbo = vbo_context(ctx);
 157    struct vbo_exec_context *exec = &vbo->exec;
 158
 159    if (ctx->NewState & (_NEW_PROGRAM | _NEW_ARRAY)) {
 160       _ae_invalidate_state(ctx);
 161    }
 162    if (ctx->NewState & _NEW_EVAL)
 163       exec->eval.recalculate_maps = GL_TRUE;
 164 }
 165
 166
 167 GLboolean
 168 _vbo_CreateContext(struct gl_context *ctx)
 169 {
 170    struct vbo_context *vbo = CALLOC_STRUCT(vbo_context);
 171
 172    ctx->vbo_context = vbo;
 173
 174    /* Initialize the arrayelt helper
 175     */
 176    if (!ctx->aelt_context &&
 177        !_ae_create_context(ctx)) {
 178       return GL_FALSE;
 179    }
 180
 181    vbo->binding.Offset = 0;
 182    vbo->binding.Stride = 0;
 183    vbo->binding.InstanceDivisor = 0;
 184    _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj,
 185                                  ctx->Shared->NullBufferObj);
 186    init_legacy_currval(ctx);
 187    init_generic_currval(ctx);
 188    init_mat_currval(ctx);
 189
 190    /* make sure all VBO_ATTRIB_ values can fit in an unsigned byte */
 191    STATIC_ASSERT(VBO_ATTRIB_MAX <= 255);
 192
 193    /* Hook our functions into exec and compile dispatch tables.  These
 194     * will pretty much be permanently installed, which means that the
 195     * vtxfmt mechanism can be removed now.
 196     */
 197    vbo_exec_init(ctx);
 198    if (ctx->API == API_OPENGL_COMPAT)
 199       vbo_save_init(ctx);
 200
 201    vbo->VAO = _mesa_new_vao(ctx, ~((GLuint)0));
 202    /* The exec VAO assumes to have all arributes bound to binding 0 */
 203    for (unsigned i = 0; i < VERT_ATTRIB_MAX; ++i)
 204       _mesa_vertex_attrib_binding(ctx, vbo->VAO, i, 0, false);
 205
 206    _math_init_eval();
 207
 208    return GL_TRUE;
 209 }
 210
 211
 212 void
 213 _vbo_DestroyContext(struct gl_context *ctx)
 214 {
 215    struct vbo_context *vbo = vbo_context(ctx);
 216
 217    if (ctx->aelt_context) {
 218       _ae_destroy_context(ctx);
 219       ctx->aelt_context = NULL;
 220    }
 221
 222    if (vbo) {
 223
 224       _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj, NULL);
 225
 226       vbo_exec_destroy(ctx);
 227       if (ctx->API == API_OPENGL_COMPAT)
 228          vbo_save_destroy(ctx);
 229       _mesa_reference_vao(ctx, &vbo->VAO, NULL);
 230       free(vbo);
 231       ctx->vbo_context = NULL;
 232    }
 233 }
 234
 235
 236 /*
 237  * Helper function for _vbo_draw_indirect below that additionally takes a zero
 238  * initialized array of _mesa_prim scratch space memory as the last argument.
 239  */
 240 static void
 241 draw_indirect(struct gl_context *ctx, GLuint mode,
 242               struct gl_buffer_object *indirect_data,
 243               GLsizeiptr indirect_offset, unsigned draw_count,
 244               unsigned stride,
 245               struct gl_buffer_object *indirect_draw_count_buffer,
 246               GLsizeiptr indirect_draw_count_offset,
 247               const struct _mesa_index_buffer *ib,
 248               struct _mesa_prim *prim)
 249 {
 250    prim[0].begin = 1;
 251    prim[draw_count - 1].end = 1;
 252    for (unsigned i = 0; i < draw_count; ++i, indirect_offset += stride) {
 253       prim[i].mode = mode;
 254       prim[i].indexed = !!ib;
 255       prim[i].indirect_offset = indirect_offset;
 256       prim[i].is_indirect = 1;
 257       prim[i].draw_id = i;
 258    }
 259
 260    /* This should always be true at this time */
 261    assert(indirect_data == ctx->DrawIndirectBuffer);
 262
 263    ctx->Driver.Draw(ctx, prim, draw_count, ib, false, 0u, ~0u,
 264                     NULL, 0, indirect_data);
 265 }
 266
 267
 268 /*
 269  * Function to be put into dd_function_table::DrawIndirect as fallback.
 270  * Calls into dd_function_table::Draw past adapting call arguments.
 271  * See dd_function_table::DrawIndirect for call argument documentation.
 272  */
 273 void
 274 _vbo_draw_indirect(struct gl_context *ctx, GLuint mode,
 275                    struct gl_buffer_object *indirect_data,
 276                    GLsizeiptr indirect_offset, unsigned draw_count,
 277                    unsigned stride,
 278                    struct gl_buffer_object *indirect_draw_count_buffer,
 279                    GLsizeiptr indirect_draw_count_offset,
 280                    const struct _mesa_index_buffer *ib)
 281 {
 282    /* Use alloca for the prim space if we are somehow in bounds. */
 283    if (draw_count*sizeof(struct _mesa_prim) < 1024) {
 284       struct _mesa_prim *space = alloca(draw_count*sizeof(struct _mesa_prim));
 285       memset(space, 0, draw_count*sizeof(struct _mesa_prim));
 286
 287       draw_indirect(ctx, mode, indirect_data, indirect_offset, draw_count,
 288                     stride, indirect_draw_count_buffer,
 289                     indirect_draw_count_offset, ib, space);
 290    } else {
 291       struct _mesa_prim *space = calloc(draw_count, sizeof(struct _mesa_prim));
 292       if (space == NULL) {
 293          _mesa_error(ctx, GL_OUT_OF_MEMORY, "gl%sDraw%sIndirect%s",
 294                      (draw_count > 1) ? "Multi" : "",
 295                      ib ? "Elements" : "Arrays",
 296                      indirect_data ? "CountARB" : "");
 297          return;
 298       }
 299
 300       draw_indirect(ctx, mode, indirect_data, indirect_offset, draw_count,
 301                     stride, indirect_draw_count_buffer,
 302                     indirect_draw_count_offset, ib, space);
 303
 304       free(space);
 305    }
 306 }