src/mesa/vbo/vbo_exec_array.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * 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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/state.h"
  31 #include "main/api_validate.h"
  32 #include "main/api_noop.h"
  33 #include "main/varray.h"
  34 #include "main/bufferobj.h"
  35 #include "glapi/dispatch.h"
  36
  37 #include "vbo_context.h"
  38
  39 /* Compute min and max elements for drawelements calls.
  40  */
  41 static void get_minmax_index( GLuint count, GLuint type,
  42                               const GLvoid *indices,
  43                               GLuint *min_index,
  44                               GLuint *max_index)
  45 {
  46    GLuint i;
  47
  48    switch(type) {
  49    case GL_UNSIGNED_INT: {
  50       const GLuint *ui_indices = (const GLuint *)indices;
  51       GLuint max_ui = ui_indices[count-1];
  52       GLuint min_ui = ui_indices[0];
  53       for (i = 0; i < count; i++) {
  54          if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
  55          if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
  56       }
  57       *min_index = min_ui;
  58       *max_index = max_ui;
  59       break;
  60    }
  61    case GL_UNSIGNED_SHORT: {
  62       const GLushort *us_indices = (const GLushort *)indices;
  63       GLuint max_us = us_indices[count-1];
  64       GLuint min_us = us_indices[0];
  65       for (i = 0; i < count; i++) {
  66          if (us_indices[i] > max_us) max_us = us_indices[i];
  67          if (us_indices[i] < min_us) min_us = us_indices[i];
  68       }
  69       *min_index = min_us;
  70       *max_index = max_us;
  71       break;
  72    }
  73    case GL_UNSIGNED_BYTE: {
  74       const GLubyte *ub_indices = (const GLubyte *)indices;
  75       GLuint max_ub = ub_indices[count-1];
  76       GLuint min_ub = ub_indices[0];
  77       for (i = 0; i < count; i++) {
  78          if (ub_indices[i] > max_ub) max_ub = ub_indices[i];
  79          if (ub_indices[i] < min_ub) min_ub = ub_indices[i];
  80       }
  81       *min_index = min_ub;
  82       *max_index = max_ub;
  83       break;
  84    }
  85    default:
  86       assert(0);
  87       break;
  88    }
  89 }
  90
  91
  92 /* Just translate the arrayobj into a sane layout.
  93  */
  94 static void bind_array_obj( GLcontext *ctx )
  95 {
  96    struct vbo_context *vbo = vbo_context(ctx);
  97    struct vbo_exec_context *exec = &vbo->exec;
  98    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  99    GLuint i;
 100
 101    /* TODO: Fix the ArrayObj struct to keep legacy arrays in an array
 102     * rather than as individual named arrays.  Then this function can
 103     * go away.
 104     */
 105    exec->array.legacy_array[VERT_ATTRIB_POS] = &arrayObj->Vertex;
 106    exec->array.legacy_array[VERT_ATTRIB_WEIGHT] = &vbo->legacy_currval[VERT_ATTRIB_WEIGHT];
 107    exec->array.legacy_array[VERT_ATTRIB_NORMAL] = &arrayObj->Normal;
 108    exec->array.legacy_array[VERT_ATTRIB_COLOR0] = &arrayObj->Color;
 109    exec->array.legacy_array[VERT_ATTRIB_COLOR1] = &arrayObj->SecondaryColor;
 110    exec->array.legacy_array[VERT_ATTRIB_FOG] = &arrayObj->FogCoord;
 111    exec->array.legacy_array[VERT_ATTRIB_COLOR_INDEX] = &arrayObj->Index;
 112    if (arrayObj->PointSize.Enabled) {
 113       /* this aliases COLOR_INDEX */
 114       exec->array.legacy_array[VERT_ATTRIB_POINT_SIZE] = &arrayObj->PointSize;
 115    }
 116    exec->array.legacy_array[VERT_ATTRIB_EDGEFLAG] = &arrayObj->EdgeFlag;
 117
 118    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
 119       exec->array.legacy_array[VERT_ATTRIB_TEX0 + i] = &arrayObj->TexCoord[i];
 120
 121    for (i = 0; i < MAX_VERTEX_GENERIC_ATTRIBS; i++) {
 122       assert(i < Elements(arrayObj->VertexAttrib));
 123       assert(i < Elements(exec->array.generic_array));
 124       exec->array.generic_array[i] = &arrayObj->VertexAttrib[i];
 125    }
 126
 127    exec->array.array_obj = arrayObj->Name;
 128 }
 129
 130 static void recalculate_input_bindings( GLcontext *ctx )
 131 {
 132    struct vbo_context *vbo = vbo_context(ctx);
 133    struct vbo_exec_context *exec = &vbo->exec;
 134    const struct gl_client_array **inputs = &exec->array.inputs[0];
 135    GLbitfield const_inputs = 0x0;
 136    GLuint i;
 137
 138    exec->array.program_mode = get_program_mode(ctx);
 139    exec->array.enabled_flags = ctx->Array.ArrayObj->_Enabled;
 140
 141    switch (exec->array.program_mode) {
 142    case VP_NONE:
 143       /* When no vertex program is active, we put the material values
 144        * into the generic slots.  This is the only situation where
 145        * material values are available as per-vertex attributes.
 146        */
 147       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 148          if (exec->array.legacy_array[i]->Enabled)
 149             inputs[i] = exec->array.legacy_array[i];
 150          else {
 151             inputs[i] = &vbo->legacy_currval[i];
 152             const_inputs |= 1 << i;
 153          }
 154       }
 155
 156       for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 157          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->mat_currval[i];
 158          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 159       }
 160
 161       /* Could use just about anything, just to fill in the empty
 162        * slots:
 163        */
 164       for (i = MAT_ATTRIB_MAX; i < VERT_ATTRIB_MAX - VERT_ATTRIB_GENERIC0; i++) {
 165          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 166          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 167       }
 168
 169       break;
 170    case VP_NV:
 171       /* NV_vertex_program - attribute arrays alias and override
 172        * conventional, legacy arrays.  No materials, and the generic
 173        * slots are vacant.
 174        */
 175       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 176          if (exec->array.generic_array[i]->Enabled)
 177             inputs[i] = exec->array.generic_array[i];
 178          else if (exec->array.legacy_array[i]->Enabled)
 179             inputs[i] = exec->array.legacy_array[i];
 180          else {
 181             inputs[i] = &vbo->legacy_currval[i];
 182             const_inputs |= 1 << i;
 183          }
 184       }
 185
 186       /* Could use just about anything, just to fill in the empty
 187        * slots:
 188        */
 189       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 190          inputs[i] = &vbo->generic_currval[i - VERT_ATTRIB_GENERIC0];
 191          const_inputs |= 1 << i;
 192       }
 193
 194       break;
 195    case VP_ARB:
 196       /* ARB_vertex_program - Only the attribute zero (position) array
 197        * aliases and overrides the legacy position array.
 198        *
 199        * Otherwise, legacy attributes available in the legacy slots,
 200        * generic attributes in the generic slots and materials are not
 201        * available as per-vertex attributes.
 202        */
 203       if (exec->array.generic_array[0]->Enabled)
 204          inputs[0] = exec->array.generic_array[0];
 205       else if (exec->array.legacy_array[0]->Enabled)
 206          inputs[0] = exec->array.legacy_array[0];
 207       else {
 208          inputs[0] = &vbo->legacy_currval[0];
 209          const_inputs |= 1 << 0;
 210       }
 211
 212
 213       for (i = 1; i <= VERT_ATTRIB_TEX7; i++) {
 214          if (exec->array.legacy_array[i]->Enabled)
 215             inputs[i] = exec->array.legacy_array[i];
 216          else {
 217             inputs[i] = &vbo->legacy_currval[i];
 218             const_inputs |= 1 << i;
 219          }
 220       }
 221
 222       for (i = 0; i < MAX_VERTEX_GENERIC_ATTRIBS; i++) {
 223          if (exec->array.generic_array[i]->Enabled)
 224             inputs[VERT_ATTRIB_GENERIC0 + i] = exec->array.generic_array[i];
 225          else {
 226             inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 227             const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 228          }
 229
 230       }
 231       break;
 232    }
 233
 234    _mesa_set_varying_vp_inputs( ctx, ~const_inputs );
 235 }
 236
 237 static void bind_arrays( GLcontext *ctx )
 238 {
 239 #if 0
 240    if (ctx->Array.ArrayObj.Name != exec->array.array_obj) {
 241       bind_array_obj(ctx);
 242       recalculate_input_bindings(ctx);
 243    }
 244    else if (exec->array.program_mode != get_program_mode(ctx) ||
 245             exec->array.enabled_flags != ctx->Array.ArrayObj->_Enabled) {
 246
 247       recalculate_input_bindings(ctx);
 248    }
 249 #else
 250    bind_array_obj(ctx);
 251    recalculate_input_bindings(ctx);
 252 #endif
 253 }
 254
 255
 256
 257 /***********************************************************************
 258  * API functions.
 259  */
 260
 261 static void GLAPIENTRY
 262 vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
 263 {
 264    GET_CURRENT_CONTEXT(ctx);
 265    struct vbo_context *vbo = vbo_context(ctx);
 266    struct vbo_exec_context *exec = &vbo->exec;
 267    struct _mesa_prim prim[1];
 268
 269    if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))
 270       return;
 271
 272    FLUSH_CURRENT( ctx, 0 );
 273
 274    if (ctx->NewState)
 275       _mesa_update_state( ctx );
 276
 277    if (!vbo_validate_shaders(ctx)) {
 278       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawArrays(bad shader)");
 279       return;
 280    }
 281
 282    bind_arrays( ctx );
 283
 284    /* Again...
 285     */
 286    if (ctx->NewState)
 287       _mesa_update_state( ctx );
 288
 289    prim[0].begin = 1;
 290    prim[0].end = 1;
 291    prim[0].weak = 0;
 292    prim[0].pad = 0;
 293    prim[0].mode = mode;
 294    prim[0].start = start;
 295    prim[0].count = count;
 296    prim[0].indexed = 0;
 297
 298    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, NULL, start, start + count - 1 );
 299
 300 #if 0
 301    {
 302       int i;
 303
 304       _mesa_printf("vbo_exec_DrawArrays(mode 0x%x, start %d, count %d):\n",
 305                    mode, start, count);
 306
 307       for (i = 0; i < 32; i++) {
 308          GLuint bufName = exec->array.inputs[i]->BufferObj->Name;
 309          GLint stride = exec->array.inputs[i]->Stride;
 310          _mesa_printf("attr %2d: size %d stride %d  enabled %d  "
 311                       "ptr %p  Bufobj %u\n",
 312                       i,
 313                       exec->array.inputs[i]->Size,
 314                       stride,
 315                       /*exec->array.inputs[i]->Enabled,*/
 316                       exec->array.legacy_array[i]->Enabled,
 317                       exec->array.inputs[i]->Ptr,
 318                       bufName);
 319
 320          if (bufName) {
 321             struct gl_buffer_object *buf = _mesa_lookup_bufferobj(ctx, bufName);
 322             GLubyte *p = ctx->Driver.MapBuffer(ctx, GL_ARRAY_BUFFER_ARB,
 323                                             GL_READ_ONLY_ARB, buf);
 324             int offset = (int) exec->array.inputs[i]->Ptr;
 325             float *f = (float *) (p + offset);
 326             int *k = (int *) f;
 327             int i;
 328             int n = (count * stride) / 4;
 329             if (n > 32)
 330                n = 32;
 331             _mesa_printf("  Data at offset %d:\n", offset);
 332             for (i = 0; i < n; i++) {
 333                _mesa_printf("    float[%d] = 0x%08x %f\n", i, k[i], f[i]);
 334             }
 335             ctx->Driver.UnmapBuffer(ctx, GL_ARRAY_BUFFER_ARB, buf);
 336          }
 337       }
 338    }
 339 #endif
 340 }
 341
 342
 343
 344 static void GLAPIENTRY
 345 vbo_exec_DrawRangeElements(GLenum mode,
 346                            GLuint start, GLuint end,
 347                            GLsizei count, GLenum type, const GLvoid *indices)
 348 {
 349    GET_CURRENT_CONTEXT(ctx);
 350    struct vbo_context *vbo = vbo_context(ctx);
 351    struct vbo_exec_context *exec = &vbo->exec;
 352    struct _mesa_index_buffer ib;
 353    struct _mesa_prim prim[1];
 354
 355    if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count, type, indices ))
 356       return;
 357
 358    FLUSH_CURRENT( ctx, 0 );
 359
 360    if (ctx->NewState)
 361       _mesa_update_state( ctx );
 362
 363    if (!vbo_validate_shaders(ctx)) {
 364       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawRangeElements(bad shader)");
 365       return;
 366    }
 367
 368    bind_arrays( ctx );
 369
 370    if (ctx->NewState)
 371       _mesa_update_state( ctx );
 372
 373    ib.count = count;
 374    ib.type = type;
 375    ib.obj = ctx->Array.ElementArrayBufferObj;
 376    ib.ptr = indices;
 377
 378    prim[0].begin = 1;
 379    prim[0].end = 1;
 380    prim[0].weak = 0;
 381    prim[0].pad = 0;
 382    prim[0].mode = mode;
 383    prim[0].start = 0;
 384    prim[0].count = count;
 385    prim[0].indexed = 1;
 386
 387    /* Need to give special consideration to rendering a range of
 388     * indices starting somewhere above zero.  Typically the
 389     * application is issuing multiple DrawRangeElements() to draw
 390     * successive primitives layed out linearly in the vertex arrays.
 391     * Unless the vertex arrays are all in a VBO (or locked as with
 392     * CVA), the OpenGL semantics imply that we need to re-read or
 393     * re-upload the vertex data on each draw call.
 394     *
 395     * In the case of hardware tnl, we want to avoid starting the
 396     * upload at zero, as it will mean every draw call uploads an
 397     * increasing amount of not-used vertex data.  Worse - in the
 398     * software tnl module, all those vertices might be transformed and
 399     * lit but never rendered.
 400     *
 401     * If we just upload or transform the vertices in start..end,
 402     * however, the indices will be incorrect.
 403     *
 404     * At this level, we don't know exactly what the requirements of
 405     * the backend are going to be, though it will likely boil down to
 406     * either:
 407     *
 408     * 1) Do nothing, everything is in a VBO and is processed once
 409     *       only.
 410     *
 411     * 2) Adjust the indices and vertex arrays so that start becomes
 412     *    zero.
 413     *
 414     * Rather than doing anything here, I'll provide a helper function
 415     * for the latter case elsewhere.
 416     */
 417
 418    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib, start, end );
 419 }
 420
 421 static void GLAPIENTRY
 422 vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices)
 423 {
 424    GET_CURRENT_CONTEXT(ctx);
 425    GLuint min_index = 0;
 426    GLuint max_index = 0;
 427
 428    if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))
 429       return;
 430
 431    if (!vbo_validate_shaders(ctx)) {
 432       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawElements(bad shader)");
 433       return;
 434    }
 435
 436    if (ctx->Array.ElementArrayBufferObj->Name) {
 437       const GLvoid *map = ctx->Driver.MapBuffer(ctx,
 438                                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
 439                                                  GL_READ_ONLY,
 440                                                  ctx->Array.ElementArrayBufferObj);
 441
 442       get_minmax_index(count, type, ADD_POINTERS(map, indices), &min_index, &max_index);
 443
 444       ctx->Driver.UnmapBuffer(ctx,
 445                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 446                               ctx->Array.ElementArrayBufferObj);
 447    }
 448    else {
 449       get_minmax_index(count, type, indices, &min_index, &max_index);
 450    }
 451
 452    vbo_exec_DrawRangeElements(mode, min_index, max_index, count, type, indices);
 453 }
 454
 455
 456 /***********************************************************************
 457  * Initialization
 458  */
 459
 460
 461
 462
 463 void vbo_exec_array_init( struct vbo_exec_context *exec )
 464 {
 465 #if 1
 466    exec->vtxfmt.DrawArrays = vbo_exec_DrawArrays;
 467    exec->vtxfmt.DrawElements = vbo_exec_DrawElements;
 468    exec->vtxfmt.DrawRangeElements = vbo_exec_DrawRangeElements;
 469 #else
 470    exec->vtxfmt.DrawArrays = _mesa_noop_DrawArrays;
 471    exec->vtxfmt.DrawElements = _mesa_noop_DrawElements;
 472    exec->vtxfmt.DrawRangeElements = _mesa_noop_DrawRangeElements;
 473 #endif
 474 }
 475
 476
 477 void vbo_exec_array_destroy( struct vbo_exec_context *exec )
 478 {
 479    /* nothing to do */
 480 }
 481
 482
 483 /* This API entrypoint is not ordinarily used */
 484 void GLAPIENTRY
 485 _mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
 486 {
 487    vbo_exec_DrawArrays(mode, first, count);
 488 }
 489
 490
 491 /* This API entrypoint is not ordinarily used */
 492 void GLAPIENTRY
 493 _mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
 494                    const GLvoid *indices)
 495 {
 496    vbo_exec_DrawElements(mode, count, type, indices);
 497 }
 498
 499
 500 /* This API entrypoint is not ordinarily used */
 501 void GLAPIENTRY
 502 _mesa_DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count,
 503                         GLenum type, const GLvoid *indices)
 504 {
 505    vbo_exec_DrawRangeElements(mode, start, end, count, type, indices);
 506 }