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 "glapi/dispatch.h"
  35
  36 #include "vbo_context.h"
  37
  38 /* Compute min and max elements for drawelements calls.
  39  */
  40 static void get_minmax_index( GLuint count, GLuint type,
  41                               const GLvoid *indices,
  42                               GLuint *min_index,
  43                               GLuint *max_index)
  44 {
  45    GLuint i;
  46
  47    switch(type) {
  48    case GL_UNSIGNED_INT: {
  49       const GLuint *ui_indices = (const GLuint *)indices;
  50       GLuint max_ui = ui_indices[count-1];
  51       GLuint min_ui = ui_indices[0];
  52       for (i = 0; i < count; i++) {
  53          if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
  54          if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
  55       }
  56       *min_index = min_ui;
  57       *max_index = max_ui;
  58       break;
  59    }
  60    case GL_UNSIGNED_SHORT: {
  61       const GLushort *us_indices = (const GLushort *)indices;
  62       GLuint max_us = us_indices[count-1];
  63       GLuint min_us = us_indices[0];
  64       for (i = 0; i < count; i++) {
  65          if (us_indices[i] > max_us) max_us = us_indices[i];
  66          if (us_indices[i] < min_us) min_us = us_indices[i];
  67       }
  68       *min_index = min_us;
  69       *max_index = max_us;
  70       break;
  71    }
  72    case GL_UNSIGNED_BYTE: {
  73       const GLubyte *ub_indices = (const GLubyte *)indices;
  74       GLuint max_ub = ub_indices[count-1];
  75       GLuint min_ub = ub_indices[0];
  76       for (i = 0; i < count; i++) {
  77          if (ub_indices[i] > max_ub) max_ub = ub_indices[i];
  78          if (ub_indices[i] < min_ub) min_ub = ub_indices[i];
  79       }
  80       *min_index = min_ub;
  81       *max_index = max_ub;
  82       break;
  83    }
  84    default:
  85       assert(0);
  86       break;
  87    }
  88 }
  89
  90
  91 /* Just translate the arrayobj into a sane layout.
  92  */
  93 static void bind_array_obj( GLcontext *ctx )
  94 {
  95    struct vbo_context *vbo = vbo_context(ctx);
  96    struct vbo_exec_context *exec = &vbo->exec;
  97    GLuint i;
  98
  99    /* TODO: Fix the ArrayObj struct to keep legacy arrays in an array
 100     * rather than as individual named arrays.  Then this function can
 101     * go away.
 102     */
 103    exec->array.legacy_array[VERT_ATTRIB_POS] = &ctx->Array.ArrayObj->Vertex;
 104    exec->array.legacy_array[VERT_ATTRIB_WEIGHT] = &vbo->legacy_currval[VERT_ATTRIB_WEIGHT];
 105    exec->array.legacy_array[VERT_ATTRIB_NORMAL] = &ctx->Array.ArrayObj->Normal;
 106    exec->array.legacy_array[VERT_ATTRIB_COLOR0] = &ctx->Array.ArrayObj->Color;
 107    exec->array.legacy_array[VERT_ATTRIB_COLOR1] = &ctx->Array.ArrayObj->SecondaryColor;
 108    exec->array.legacy_array[VERT_ATTRIB_FOG] = &ctx->Array.ArrayObj->FogCoord;
 109    exec->array.legacy_array[VERT_ATTRIB_COLOR_INDEX] = &ctx->Array.ArrayObj->Index;
 110    if (ctx->Array.ArrayObj->PointSize.Enabled) {
 111       /* this aliases COLOR_INDEX */
 112       exec->array.legacy_array[VERT_ATTRIB_POINT_SIZE] = &ctx->Array.ArrayObj->PointSize;
 113    }
 114    exec->array.legacy_array[VERT_ATTRIB_EDGEFLAG] = &ctx->Array.ArrayObj->EdgeFlag;
 115
 116    for (i = 0; i < 8; i++)
 117       exec->array.legacy_array[VERT_ATTRIB_TEX0 + i] = &ctx->Array.ArrayObj->TexCoord[i];
 118
 119    for (i = 0; i < VERT_ATTRIB_MAX; i++)
 120       exec->array.generic_array[i] = &ctx->Array.ArrayObj->VertexAttrib[i];
 121
 122    exec->array.array_obj = ctx->Array.ArrayObj->Name;
 123 }
 124
 125 static void recalculate_input_bindings( GLcontext *ctx )
 126 {
 127    struct vbo_context *vbo = vbo_context(ctx);
 128    struct vbo_exec_context *exec = &vbo->exec;
 129    const struct gl_client_array **inputs = &exec->array.inputs[0];
 130    GLbitfield const_inputs = 0x0;
 131    GLuint i;
 132
 133    exec->array.program_mode = get_program_mode(ctx);
 134    exec->array.enabled_flags = ctx->Array.ArrayObj->_Enabled;
 135
 136    switch (exec->array.program_mode) {
 137    case VP_NONE:
 138       /* When no vertex program is active, we put the material values
 139        * into the generic slots.  This is the only situation where
 140        * material values are available as per-vertex attributes.
 141        */
 142       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 143          if (exec->array.legacy_array[i]->Enabled)
 144             inputs[i] = exec->array.legacy_array[i];
 145          else {
 146             inputs[i] = &vbo->legacy_currval[i];
 147             const_inputs |= 1 << i;
 148          }
 149       }
 150
 151       for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 152          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->mat_currval[i];
 153          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 154       }
 155
 156       /* Could use just about anything, just to fill in the empty
 157        * slots:
 158        */
 159       for (i = MAT_ATTRIB_MAX; i < VERT_ATTRIB_MAX - VERT_ATTRIB_GENERIC0; i++) {
 160          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 161          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 162       }
 163
 164       break;
 165    case VP_NV:
 166       /* NV_vertex_program - attribute arrays alias and override
 167        * conventional, legacy arrays.  No materials, and the generic
 168        * slots are vacant.
 169        */
 170       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 171          if (exec->array.generic_array[i]->Enabled)
 172             inputs[i] = exec->array.generic_array[i];
 173          else if (exec->array.legacy_array[i]->Enabled)
 174             inputs[i] = exec->array.legacy_array[i];
 175          else {
 176             inputs[i] = &vbo->legacy_currval[i];
 177             const_inputs |= 1 << i;
 178          }
 179       }
 180
 181       /* Could use just about anything, just to fill in the empty
 182        * slots:
 183        */
 184       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 185          inputs[i] = &vbo->generic_currval[i - VERT_ATTRIB_GENERIC0];
 186          const_inputs |= 1 << i;
 187       }
 188
 189       break;
 190    case VP_ARB:
 191       /* ARB_vertex_program - Only the attribute zero (position) array
 192        * aliases and overrides the legacy position array.
 193        *
 194        * Otherwise, legacy attributes available in the legacy slots,
 195        * generic attributes in the generic slots and materials are not
 196        * available as per-vertex attributes.
 197        */
 198       if (exec->array.generic_array[0]->Enabled)
 199          inputs[0] = exec->array.generic_array[0];
 200       else if (exec->array.legacy_array[0]->Enabled)
 201          inputs[0] = exec->array.legacy_array[0];
 202       else {
 203          inputs[0] = &vbo->legacy_currval[0];
 204          const_inputs |= 1 << 0;
 205       }
 206
 207
 208       for (i = 1; i <= VERT_ATTRIB_TEX7; i++) {
 209          if (exec->array.legacy_array[i]->Enabled)
 210             inputs[i] = exec->array.legacy_array[i];
 211          else {
 212             inputs[i] = &vbo->legacy_currval[i];
 213             const_inputs |= 1 << i;
 214          }
 215       }
 216
 217       for (i = 0; i < 16; i++) {
 218          if (exec->array.generic_array[i]->Enabled)
 219             inputs[VERT_ATTRIB_GENERIC0 + i] = exec->array.generic_array[i];
 220          else {
 221             inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 222             const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 223          }
 224
 225       }
 226       break;
 227    }
 228
 229    _mesa_set_varying_vp_inputs( ctx, ~const_inputs );
 230 }
 231
 232 static void bind_arrays( GLcontext *ctx )
 233 {
 234 #if 0
 235    if (ctx->Array.ArrayObj.Name != exec->array.array_obj) {
 236       bind_array_obj(ctx);
 237       recalculate_input_bindings(ctx);
 238    }
 239    else if (exec->array.program_mode != get_program_mode(ctx) ||
 240             exec->array.enabled_flags != ctx->Array.ArrayObj->_Enabled) {
 241
 242       recalculate_input_bindings(ctx);
 243    }
 244 #else
 245    bind_array_obj(ctx);
 246    recalculate_input_bindings(ctx);
 247 #endif
 248 }
 249
 250
 251
 252 /***********************************************************************
 253  * API functions.
 254  */
 255
 256 static void GLAPIENTRY
 257 vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
 258 {
 259    GET_CURRENT_CONTEXT(ctx);
 260    struct vbo_context *vbo = vbo_context(ctx);
 261    struct vbo_exec_context *exec = &vbo->exec;
 262    struct _mesa_prim prim[1];
 263
 264    if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))
 265       return;
 266
 267    FLUSH_CURRENT( ctx, 0 );
 268
 269    if (ctx->NewState)
 270       _mesa_update_state( ctx );
 271
 272    if (!vbo_validate_shaders(ctx)) {
 273       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawArrays(bad shader)");
 274       return;
 275    }
 276
 277    bind_arrays( ctx );
 278
 279    /* Again...
 280     */
 281    if (ctx->NewState)
 282       _mesa_update_state( ctx );
 283
 284    prim[0].begin = 1;
 285    prim[0].end = 1;
 286    prim[0].weak = 0;
 287    prim[0].pad = 0;
 288    prim[0].mode = mode;
 289    prim[0].start = start;
 290    prim[0].count = count;
 291    prim[0].indexed = 0;
 292
 293    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, NULL, start, start + count - 1 );
 294 }
 295
 296
 297
 298 static void GLAPIENTRY
 299 vbo_exec_DrawRangeElements(GLenum mode,
 300                            GLuint start, GLuint end,
 301                            GLsizei count, GLenum type, const GLvoid *indices)
 302 {
 303    GET_CURRENT_CONTEXT(ctx);
 304    struct vbo_context *vbo = vbo_context(ctx);
 305    struct vbo_exec_context *exec = &vbo->exec;
 306    struct _mesa_index_buffer ib;
 307    struct _mesa_prim prim[1];
 308
 309    if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count, type, indices ))
 310       return;
 311
 312    FLUSH_CURRENT( ctx, 0 );
 313
 314    if (ctx->NewState)
 315       _mesa_update_state( ctx );
 316
 317    if (!vbo_validate_shaders(ctx)) {
 318       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawRangeElements(bad shader)");
 319       return;
 320    }
 321
 322    bind_arrays( ctx );
 323
 324    if (ctx->NewState)
 325       _mesa_update_state( ctx );
 326
 327    ib.count = count;
 328    ib.type = type;
 329    ib.obj = ctx->Array.ElementArrayBufferObj;
 330    ib.ptr = indices;
 331
 332    prim[0].begin = 1;
 333    prim[0].end = 1;
 334    prim[0].weak = 0;
 335    prim[0].pad = 0;
 336    prim[0].mode = mode;
 337    prim[0].start = 0;
 338    prim[0].count = count;
 339    prim[0].indexed = 1;
 340
 341    /* Need to give special consideration to rendering a range of
 342     * indices starting somewhere above zero.  Typically the
 343     * application is issuing multiple DrawRangeElements() to draw
 344     * successive primitives layed out linearly in the vertex arrays.
 345     * Unless the vertex arrays are all in a VBO (or locked as with
 346     * CVA), the OpenGL semantics imply that we need to re-read or
 347     * re-upload the vertex data on each draw call.
 348     *
 349     * In the case of hardware tnl, we want to avoid starting the
 350     * upload at zero, as it will mean every draw call uploads an
 351     * increasing amount of not-used vertex data.  Worse - in the
 352     * software tnl module, all those vertices might be transformed and
 353     * lit but never rendered.
 354     *
 355     * If we just upload or transform the vertices in start..end,
 356     * however, the indices will be incorrect.
 357     *
 358     * At this level, we don't know exactly what the requirements of
 359     * the backend are going to be, though it will likely boil down to
 360     * either:
 361     *
 362     * 1) Do nothing, everything is in a VBO and is processed once
 363     *       only.
 364     *
 365     * 2) Adjust the indices and vertex arrays so that start becomes
 366     *    zero.
 367     *
 368     * Rather than doing anything here, I'll provide a helper function
 369     * for the latter case elsewhere.
 370     */
 371
 372    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib, start, end );
 373 }
 374
 375 static void GLAPIENTRY
 376 vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices)
 377 {
 378    GET_CURRENT_CONTEXT(ctx);
 379    GLuint min_index = 0;
 380    GLuint max_index = 0;
 381
 382    if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))
 383       return;
 384
 385    if (!vbo_validate_shaders(ctx)) {
 386       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawElements(bad shader)");
 387       return;
 388    }
 389
 390    if (ctx->Array.ElementArrayBufferObj->Name) {
 391       const GLvoid *map = ctx->Driver.MapBuffer(ctx,
 392                                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
 393                                                  GL_READ_ONLY,
 394                                                  ctx->Array.ElementArrayBufferObj);
 395
 396       get_minmax_index(count, type, ADD_POINTERS(map, indices), &min_index, &max_index);
 397
 398       ctx->Driver.UnmapBuffer(ctx,
 399                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 400                               ctx->Array.ElementArrayBufferObj);
 401    }
 402    else {
 403       get_minmax_index(count, type, indices, &min_index, &max_index);
 404    }
 405
 406    vbo_exec_DrawRangeElements(mode, min_index, max_index, count, type, indices);
 407 }
 408
 409
 410 /***********************************************************************
 411  * Initialization
 412  */
 413
 414
 415
 416
 417 void vbo_exec_array_init( struct vbo_exec_context *exec )
 418 {
 419 #if 1
 420    exec->vtxfmt.DrawArrays = vbo_exec_DrawArrays;
 421    exec->vtxfmt.DrawElements = vbo_exec_DrawElements;
 422    exec->vtxfmt.DrawRangeElements = vbo_exec_DrawRangeElements;
 423 #else
 424    exec->vtxfmt.DrawArrays = _mesa_noop_DrawArrays;
 425    exec->vtxfmt.DrawElements = _mesa_noop_DrawElements;
 426    exec->vtxfmt.DrawRangeElements = _mesa_noop_DrawRangeElements;
 427 #endif
 428 }
 429
 430
 431 void vbo_exec_array_destroy( struct vbo_exec_context *exec )
 432 {
 433    /* nothing to do */
 434 }
 435
 436
 437 /* This API entrypoint is not ordinarily used */
 438 void GLAPIENTRY
 439 _mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
 440 {
 441    vbo_exec_DrawArrays(mode, first, count);
 442 }
 443
 444
 445 /* This API entrypoint is not ordinarily used */
 446 void GLAPIENTRY
 447 _mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
 448                    const GLvoid *indices)
 449 {
 450    vbo_exec_DrawElements(mode, count, type, indices);
 451 }
 452
 453
 454 /* This API entrypoint is not ordinarily used */
 455 void GLAPIENTRY
 456 _mesa_DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count,
 457                         GLenum type, const GLvoid *indices)
 458 {
 459    vbo_exec_DrawRangeElements(mode, start, end, count, type, indices);
 460 }