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 /**
 145  * Fallback for when a driver does not call vbo_set_indirect_draw_func().
 146  */
 147 static void
 148 vbo_draw_indirect_prims(struct gl_context *ctx,
 149                         GLuint mode,
 150                         struct gl_buffer_object *indirect_buffer,
 151                         GLsizeiptr indirect_offset,
 152                         unsigned draw_count,
 153                         unsigned stride,
 154                         struct gl_buffer_object *indirect_draw_count_buffer,
 155                         GLsizeiptr indirect_draw_count_offset,
 156                         const struct _mesa_index_buffer *ib)
 157 {
 158    struct vbo_context *vbo = vbo_context(ctx);
 159    struct _mesa_prim *prim;
 160    GLsizei i;
 161
 162    prim = calloc(draw_count, sizeof(*prim));
 163    if (prim == NULL) {
 164       _mesa_error(ctx, GL_OUT_OF_MEMORY, "gl%sDraw%sIndirect%s",
 165                   (draw_count > 1) ? "Multi" : "",
 166                   ib ? "Elements" : "Arrays",
 167                   indirect_buffer ? "CountARB" : "");
 168       return;
 169    }
 170
 171    prim[0].begin = 1;
 172    prim[draw_count - 1].end = 1;
 173    for (i = 0; i < draw_count; ++i, indirect_offset += stride) {
 174       prim[i].mode = mode;
 175       prim[i].indexed = !!ib;
 176       prim[i].indirect_offset = indirect_offset;
 177       prim[i].is_indirect = 1;
 178       prim[i].draw_id = i;
 179    }
 180
 181    /* This should always be true at this time */
 182    assert(indirect_buffer == ctx->DrawIndirectBuffer);
 183
 184    vbo->draw_prims(ctx, prim, draw_count,
 185                    ib, false, 0, ~0,
 186                    NULL, 0,
 187                    indirect_buffer);
 188
 189    free(prim);
 190 }
 191
 192
 193 void
 194 _vbo_install_exec_vtxfmt(struct gl_context *ctx)
 195 {
 196    struct vbo_context *vbo = vbo_context(ctx);
 197
 198    _mesa_install_exec_vtxfmt(ctx, &vbo->exec.vtxfmt);
 199 }
 200
 201
 202 void
 203 vbo_exec_invalidate_state(struct gl_context *ctx)
 204 {
 205    struct vbo_context *vbo = vbo_context(ctx);
 206    struct vbo_exec_context *exec = &vbo->exec;
 207
 208    if (ctx->NewState & (_NEW_PROGRAM | _NEW_ARRAY)) {
 209       exec->array.recalculate_inputs = GL_TRUE;
 210
 211       _ae_invalidate_state(ctx);
 212    }
 213    /* If _mesa_update_state is called in a non draw code path,
 214     * changes in the VAO need to be captured.
 215     */
 216    if (ctx->Array.VAO->NewArrays)
 217       exec->array.recalculate_inputs = GL_TRUE;
 218
 219    if (ctx->NewState & _NEW_EVAL)
 220       exec->eval.recalculate_maps = GL_TRUE;
 221 }
 222
 223
 224 GLboolean
 225 _vbo_CreateContext(struct gl_context *ctx)
 226 {
 227    struct vbo_context *vbo = CALLOC_STRUCT(vbo_context);
 228
 229    ctx->vbo_context = vbo;
 230
 231    /* Initialize the arrayelt helper
 232     */
 233    if (!ctx->aelt_context &&
 234        !_ae_create_context(ctx)) {
 235       return GL_FALSE;
 236    }
 237
 238    vbo->binding.Offset = 0;
 239    vbo->binding.Stride = 0;
 240    vbo->binding.InstanceDivisor = 0;
 241    _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj,
 242                                  ctx->Shared->NullBufferObj);
 243    init_legacy_currval(ctx);
 244    init_generic_currval(ctx);
 245    init_mat_currval(ctx);
 246    _vbo_init_inputs(&vbo->draw_arrays);
 247    vbo_set_indirect_draw_func(ctx, vbo_draw_indirect_prims);
 248
 249    /* make sure all VBO_ATTRIB_ values can fit in an unsigned byte */
 250    STATIC_ASSERT(VBO_ATTRIB_MAX <= 255);
 251
 252    /* Hook our functions into exec and compile dispatch tables.  These
 253     * will pretty much be permanently installed, which means that the
 254     * vtxfmt mechanism can be removed now.
 255     */
 256    vbo_exec_init(ctx);
 257    if (ctx->API == API_OPENGL_COMPAT)
 258       vbo_save_init(ctx);
 259
 260    vbo->VAO = _mesa_new_vao(ctx, ~((GLuint)0));
 261    /* The exec VAO assumes to have all arributes bound to binding 0 */
 262    for (unsigned i = 0; i < VERT_ATTRIB_MAX; ++i)
 263       _mesa_vertex_attrib_binding(ctx, vbo->VAO, i, 0, false);
 264
 265    _math_init_eval();
 266
 267    return GL_TRUE;
 268 }
 269
 270
 271 void
 272 _vbo_DestroyContext(struct gl_context *ctx)
 273 {
 274    struct vbo_context *vbo = vbo_context(ctx);
 275
 276    if (ctx->aelt_context) {
 277       _ae_destroy_context(ctx);
 278       ctx->aelt_context = NULL;
 279    }
 280
 281    if (vbo) {
 282
 283       _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj, NULL);
 284
 285       vbo_exec_destroy(ctx);
 286       if (ctx->API == API_OPENGL_COMPAT)
 287          vbo_save_destroy(ctx);
 288       _mesa_reference_vao(ctx, &vbo->VAO, NULL);
 289       free(vbo);
 290       ctx->vbo_context = NULL;
 291    }
 292 }
 293
 294
 295 void
 296 vbo_set_draw_func(struct gl_context *ctx, vbo_draw_func func)
 297 {
 298    struct vbo_context *vbo = vbo_context(ctx);
 299    vbo->draw_prims = func;
 300 }
 301
 302
 303 void
 304 vbo_set_indirect_draw_func(struct gl_context *ctx,
 305                            vbo_indirect_draw_func func)
 306 {
 307    struct vbo_context *vbo = vbo_context(ctx);
 308    vbo->draw_indirect_prims = func;
 309 }
 310
 311
 312 /**
 313  * Examine the enabled vertex arrays to set the exec->array.inputs[] values.
 314  * These will point to the arrays to actually use for drawing.  Some will
 315  * be user-provided arrays, other will be zero-stride const-valued arrays.
 316  */
 317 static void
 318 vbo_bind_arrays(struct gl_context *ctx)
 319 {
 320    struct vbo_context *vbo = vbo_context(ctx);
 321    struct vbo_exec_context *exec = &vbo->exec;
 322
 323    _mesa_set_drawing_arrays(ctx, vbo->draw_arrays.inputs);
 324
 325    if (exec->array.recalculate_inputs) {
 326       /* Finally update the inputs array */
 327       _vbo_update_inputs(ctx, &vbo->draw_arrays);
 328       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 329       exec->array.recalculate_inputs = GL_FALSE;
 330    }
 331
 332    assert(ctx->NewState == 0);
 333    assert(ctx->Array._DrawVAO->NewArrays == 0);
 334 }
 335
 336
 337 void
 338 _vbo_draw(struct gl_context *ctx, const struct _mesa_prim *prims,
 339                GLuint nr_prims, const struct _mesa_index_buffer *ib,
 340                GLboolean index_bounds_valid, GLuint min_index, GLuint max_index,
 341                struct gl_transform_feedback_object *tfb_vertcount,
 342                unsigned tfb_stream, struct gl_buffer_object *indirect)
 343 {
 344    struct vbo_context *vbo = vbo_context(ctx);
 345    vbo_bind_arrays(ctx);
 346    vbo->draw_prims(ctx, prims, nr_prims, ib, index_bounds_valid,
 347                    min_index, max_index, tfb_vertcount, tfb_stream, indirect);
 348 }
 349
 350
 351 void
 352 _vbo_draw_indirect(struct gl_context *ctx, GLuint mode,
 353                         struct gl_buffer_object *indirect_data,
 354                         GLsizeiptr indirect_offset, unsigned draw_count,
 355                         unsigned stride,
 356                         struct gl_buffer_object *indirect_draw_count_buffer,
 357                         GLsizeiptr indirect_draw_count_offset,
 358                         const struct _mesa_index_buffer *ib)
 359 {
 360    struct vbo_context *vbo = vbo_context(ctx);
 361    vbo_bind_arrays(ctx);
 362    vbo->draw_indirect_prims(ctx, mode, indirect_data, indirect_offset,
 363                             draw_count, stride, indirect_draw_count_buffer,
 364                             indirect_draw_count_offset, ib);
 365 }