src/mesa/tnl/t_array_api.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.0
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file t_array_api.c
  27  * \brief Vertex array API functions (glDrawArrays, etc)
  28  * \author Keith Whitwell
  29  */
  30
  31 #include "glheader.h"
  32 #include "api_validate.h"
  33 #include "context.h"
  34 #include "imports.h"
  35 #include "macros.h"
  36 #include "mtypes.h"
  37 #include "state.h"
  38
  39 #include "array_cache/acache.h"
  40
  41 #include "t_array_api.h"
  42 #include "t_array_import.h"
  43 #include "t_save_api.h"
  44 #include "t_context.h"
  45 #include "t_pipeline.h"
  46
  47 static void fallback_drawarrays( GLcontext *ctx, GLenum mode, GLint start,
  48                                  GLsizei count )
  49 {
  50    GLint i;
  51
  52    assert(!ctx->CompileFlag);
  53    assert(ctx->Driver.CurrentExecPrimitive == GL_POLYGON+1);
  54
  55    glBegin(mode);
  56    for (i = start; i < count; i++)
  57       glArrayElement( i );
  58    glEnd();
  59 }
  60
  61
  62 static void fallback_drawelements( GLcontext *ctx, GLenum mode, GLsizei count,
  63                                    const GLuint *indices)
  64 {
  65    GLint i;
  66
  67    assert(!ctx->CompileFlag);
  68    assert(ctx->Driver.CurrentExecPrimitive == GL_POLYGON+1);
  69
  70    /* Here, indices will already reflect the buffer object if active */
  71
  72    glBegin(mode);
  73    for (i = 0 ; i < count ; i++) {
  74       glArrayElement( indices[i] );
  75    }
  76    glEnd();
  77 }
  78
  79
  80 static void _tnl_draw_range_elements( GLcontext *ctx, GLenum mode,
  81                                       GLuint start, GLuint end,
  82                                       GLsizei count, GLuint *indices )
  83
  84 {
  85    TNLcontext *tnl = TNL_CONTEXT(ctx);
  86    struct tnl_prim prim;
  87    int i;
  88    FLUSH_CURRENT( ctx, 0 );
  89
  90    if (tnl->pipeline.build_state_changes)
  91       _tnl_validate_pipeline( ctx );
  92
  93    /* XXX is "end" correct?  Looking at the implementation of
  94     * _tnl_vb_bind_arrays(), perhaps we should pass end-start.
  95     */
  96    _tnl_vb_bind_arrays( ctx, start, end );
  97
  98    tnl->vb.Primitive = &prim;
  99    tnl->vb.Primitive[0].mode = mode | PRIM_BEGIN | PRIM_END;
 100    tnl->vb.Primitive[0].start = 0;
 101    tnl->vb.Primitive[0].count = count;
 102    tnl->vb.PrimitiveCount = 1;
 103
 104    tnl->vb.Elts = (GLuint *)indices;
 105
 106    if (start)
 107       for (i = 0 ; i < count ; i++)
 108          indices[i] -= start;
 109
 110    if (ctx->Array.LockCount)
 111       tnl->Driver.RunPipeline( ctx );
 112    else {
 113       /* The lower 16 bits represent the conventional arrays while the
 114        * upper 16 bits represent the generic arrays.  OR those bits
 115        * together to indicate which vertex attribs are in effect.
 116        */
 117       GLuint enabledArrays = ctx->Array._Enabled | (ctx->Array._Enabled >> 16);
 118       /* Note that arrays may have changed before/after execution.
 119        */
 120       tnl->pipeline.run_input_changes |= enabledArrays;
 121       tnl->Driver.RunPipeline( ctx );
 122       tnl->pipeline.run_input_changes |= enabledArrays;
 123    }
 124
 125    if (start)
 126       for (i = 0 ; i < count ; i++)
 127          indices[i] += start;
 128 }
 129
 130
 131
 132 /**
 133  * Called via the GL API dispatcher.
 134  */
 135 void GLAPIENTRY
 136 _tnl_DrawArrays(GLenum mode, GLint start, GLsizei count)
 137 {
 138    GET_CURRENT_CONTEXT(ctx);
 139    TNLcontext *tnl = TNL_CONTEXT(ctx);
 140    GLuint thresh = (ctx->Driver.NeedFlush & FLUSH_STORED_VERTICES) ? 30 : 10;
 141    GLuint enabledArrays;
 142
 143    if (MESA_VERBOSE & VERBOSE_API)
 144       _mesa_debug(NULL, "_tnl_DrawArrays %d %d\n", start, count);
 145
 146    /* Check arguments, etc.
 147     */
 148    if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))
 149       return;
 150
 151    if (tnl->pipeline.build_state_changes)
 152       _tnl_validate_pipeline( ctx );
 153
 154    assert(!ctx->CompileFlag);
 155
 156    if (!ctx->Array.LockCount && (GLuint) count < thresh) {
 157       /* Small primitives: attempt to share a vb (at the expense of
 158        * using the immediate interface).
 159       */
 160       fallback_drawarrays( ctx, mode, start, start + count );
 161    }
 162    else if (ctx->Array.LockCount &&
 163             count <= (GLint) ctx->Const.MaxArrayLockSize) {
 164
 165       struct tnl_prim prim;
 166
 167       /* Locked primitives which can fit in a single vertex buffer:
 168        */
 169       FLUSH_CURRENT( ctx, 0 );
 170
 171       if (start < (GLint) ctx->Array.LockFirst)
 172          start = ctx->Array.LockFirst;
 173       if (start + count > (GLint) ctx->Array.LockCount)
 174          count = ctx->Array.LockCount - start;
 175
 176       /* Locked drawarrays.  Reuse any previously transformed data.
 177        */
 178       _tnl_vb_bind_arrays( ctx, ctx->Array.LockFirst, ctx->Array.LockCount );
 179
 180       tnl->vb.Primitive = &prim;
 181       tnl->vb.Primitive[0].mode = mode | PRIM_BEGIN | PRIM_END;
 182       tnl->vb.Primitive[0].start = start;
 183       tnl->vb.Primitive[0].count = count;
 184       tnl->vb.PrimitiveCount = 1;
 185
 186       tnl->Driver.RunPipeline( ctx );
 187    }
 188    else {
 189       int bufsz = 256;          /* Use a small buffer for cache goodness */
 190       int j, nr;
 191       int minimum, modulo, skip;
 192
 193       /* Large primitives requiring decomposition to multiple vertex
 194        * buffers:
 195        */
 196       switch (mode) {
 197       case GL_POINTS:
 198          minimum = 0;
 199          modulo = 1;
 200          skip = 0;
 201          break;
 202       case GL_LINES:
 203          minimum = 1;
 204          modulo = 2;
 205          skip = 1;
 206          break;
 207       case GL_LINE_STRIP:
 208          minimum = 1;
 209          modulo = 1;
 210          skip = 0;
 211          break;
 212       case GL_TRIANGLES:
 213          minimum = 2;
 214          modulo = 3;
 215          skip = 2;
 216          break;
 217       case GL_TRIANGLE_STRIP:
 218          minimum = 2;
 219          modulo = 1;
 220          skip = 0;
 221          break;
 222       case GL_QUADS:
 223          minimum = 3;
 224          modulo = 4;
 225          skip = 3;
 226          break;
 227       case GL_QUAD_STRIP:
 228          minimum = 3;
 229          modulo = 2;
 230          skip = 0;
 231          break;
 232       case GL_LINE_LOOP:
 233       case GL_TRIANGLE_FAN:
 234       case GL_POLYGON:
 235       default:
 236          /* Primitives requiring a copied vertex (fan-like primitives)
 237           * must use the slow path if they cannot fit in a single
 238           * vertex buffer.
 239           */
 240          if (count <= (GLint) ctx->Const.MaxArrayLockSize) {
 241             bufsz = ctx->Const.MaxArrayLockSize;
 242             minimum = 0;
 243             modulo = 1;
 244             skip = 0;
 245          }
 246          else {
 247             fallback_drawarrays( ctx, mode, start, start + count );
 248             return;
 249          }
 250       }
 251
 252       FLUSH_CURRENT( ctx, 0 );
 253
 254       bufsz -= bufsz % modulo;
 255       bufsz -= minimum;
 256       count += start;
 257
 258       for (j = start + minimum ; j < count ; j += nr + skip ) {
 259
 260          struct tnl_prim prim;
 261
 262          nr = MIN2( bufsz, count - j );
 263
 264          /* XXX is the last parameter a count or index into the array??? */
 265          _tnl_vb_bind_arrays( ctx, j - minimum, j + nr );
 266
 267          tnl->vb.Primitive = &prim;
 268          tnl->vb.Primitive[0].mode = mode;
 269
 270          if (j == start + minimum)
 271             tnl->vb.Primitive[0].mode |= PRIM_BEGIN;
 272
 273          if (j + nr + skip >= count)
 274             tnl->vb.Primitive[0].mode |= PRIM_END;
 275
 276          tnl->vb.Primitive[0].start = 0;
 277          tnl->vb.Primitive[0].count = nr + minimum;
 278          tnl->vb.PrimitiveCount = 1;
 279
 280          /* The lower 16 bits represent the conventional arrays while the
 281           * upper 16 bits represent the generic arrays.  OR those bits
 282           * together to indicate which vertex attribs are in effect.
 283           */
 284          enabledArrays = ctx->Array._Enabled | (ctx->Array._Enabled >> 16);
 285          /* Note that arrays may have changed before/after execution.
 286           */
 287          tnl->pipeline.run_input_changes |= enabledArrays;
 288          tnl->Driver.RunPipeline( ctx );
 289          tnl->pipeline.run_input_changes |= enabledArrays;
 290       }
 291    }
 292 }
 293
 294
 295 /**
 296  * Called via the GL API dispatcher.
 297  */
 298 void GLAPIENTRY
 299 _tnl_DrawRangeElements(GLenum mode,
 300                        GLuint start, GLuint end,
 301                        GLsizei count, GLenum type, const GLvoid *indices)
 302 {
 303    GET_CURRENT_CONTEXT(ctx);
 304    GLuint *ui_indices;
 305
 306    if (MESA_VERBOSE & VERBOSE_API)
 307       _mesa_debug(NULL, "_tnl_DrawRangeElements %d %d %d\n", start, end, count);
 308
 309    if (ctx->Array.ElementArrayBufferObj->Name) {
 310       /* use indices in the buffer object */
 311       if (!ctx->Array.ElementArrayBufferObj->Data) {
 312          _mesa_warning(ctx,
 313                        "DrawRangeElements with empty vertex elements buffer!");
 314          return;
 315       }
 316       /* actual address is the sum of pointers */
 317       indices = (const GLvoid *)
 318          ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
 319                       (const GLubyte *) indices);
 320    }
 321
 322    /* Check arguments, etc.
 323     */
 324    if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count,
 325                                           type, indices ))
 326       return;
 327
 328    ui_indices = (GLuint *)_ac_import_elements( ctx, GL_UNSIGNED_INT,
 329                                                count, type, indices );
 330
 331
 332    assert(!ctx->CompileFlag);
 333
 334    if (ctx->Array.LockCount) {
 335       /* Are the arrays already locked?  If so we currently have to look
 336        * at the whole locked range.
 337        */
 338       if (start >= ctx->Array.LockFirst && end <= ctx->Array.LockCount)
 339          _tnl_draw_range_elements( ctx, mode,
 340                                    ctx->Array.LockFirst,
 341                                    ctx->Array.LockCount,
 342                                    count, ui_indices );
 343       else {
 344          /* The spec says referencing elements outside the locked
 345           * range is undefined.  I'm going to make it a noop this time
 346           * round, maybe come up with something beter before 3.6.
 347           *
 348           * May be able to get away with just setting LockCount==0,
 349           * though this raises the problems of dependent state.  May
 350           * have to call glUnlockArrays() directly?
 351           *
 352           * Or scan the list and replace bad indices?
 353           */
 354          _mesa_problem( ctx,
 355                      "DrawRangeElements references "
 356                      "elements outside locked range.");
 357       }
 358    }
 359    else if (end - start + 1 <= ctx->Const.MaxArrayLockSize) {
 360       /* The arrays aren't locked but we can still fit them inside a
 361        * single vertexbuffer.
 362        */
 363       _tnl_draw_range_elements( ctx, mode, start, end + 1, count, ui_indices );
 364    }
 365    else {
 366       /* Range is too big to optimize:
 367        */
 368       fallback_drawelements( ctx, mode, count, ui_indices );
 369    }
 370 }
 371
 372
 373
 374 /**
 375  * Called via the GL API dispatcher.
 376  */
 377 void GLAPIENTRY
 378 _tnl_DrawElements(GLenum mode, GLsizei count, GLenum type,
 379                   const GLvoid *indices)
 380 {
 381    GET_CURRENT_CONTEXT(ctx);
 382    GLuint *ui_indices;
 383
 384    if (MESA_VERBOSE & VERBOSE_API)
 385       _mesa_debug(NULL, "_tnl_DrawElements %d\n", count);
 386
 387    /* Check arguments, etc. */
 388    if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))
 389       return;
 390
 391    if (ctx->Array.ElementArrayBufferObj->Name) {
 392       /* actual address is the sum of pointers */
 393       indices = (const GLvoid *)
 394          ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
 395                       (const GLubyte *) indices);
 396    }
 397
 398    ui_indices = (GLuint *)_ac_import_elements( ctx, GL_UNSIGNED_INT,
 399                                                count, type, indices );
 400
 401    assert(!ctx->CompileFlag);
 402
 403    if (ctx->Array.LockCount) {
 404       _tnl_draw_range_elements( ctx, mode,
 405                                 ctx->Array.LockFirst,
 406                                 ctx->Array.LockCount,
 407                                 count, ui_indices );
 408    }
 409    else {
 410       /* Scan the index list and see if we can use the locked path anyway.
 411        */
 412       GLuint max_elt = 0;
 413       GLint i;
 414
 415       for (i = 0 ; i < count ; i++)
 416          if (ui_indices[i] > max_elt)
 417             max_elt = ui_indices[i];
 418
 419       /* XXX should this < really be <= ??? */
 420       if (max_elt < ctx->Const.MaxArrayLockSize && /* can we use it? */
 421           max_elt < (GLuint) count)                /* do we want to use it? */
 422          _tnl_draw_range_elements( ctx, mode, 0, max_elt+1, count, ui_indices );
 423       else
 424          fallback_drawelements( ctx, mode, count, ui_indices );
 425    }
 426 }
 427
 428
 429 /**
 430  * Initialize context's vertex array fields.  Called during T 'n L context
 431  * creation.
 432  */
 433 void _tnl_array_init( GLcontext *ctx )
 434 {
 435    TNLcontext *tnl = TNL_CONTEXT(ctx);
 436    struct tnl_vertex_arrays *tmp = &tnl->array_inputs;
 437    GLvertexformat *vfmt = &(TNL_CONTEXT(ctx)->exec_vtxfmt);
 438    GLuint i;
 439
 440    vfmt->DrawArrays = _tnl_DrawArrays;
 441    vfmt->DrawElements = _tnl_DrawElements;
 442    vfmt->DrawRangeElements = _tnl_DrawRangeElements;
 443
 444    /* Setup vector pointers that will be used to bind arrays to VB's.
 445     */
 446    _mesa_vector4f_init( &tmp->Obj, 0, 0 );
 447    _mesa_vector4f_init( &tmp->Normal, 0, 0 );
 448    _mesa_vector4f_init( &tmp->FogCoord, 0, 0 );
 449    _mesa_vector4f_init( &tmp->Index, 0, 0 );
 450
 451    for (i = 0; i < ctx->Const.MaxTextureUnits; i++)
 452       _mesa_vector4f_init( &tmp->TexCoord[i], 0, 0);
 453 }
 454
 455
 456 /**
 457  * Destroy the context's vertex array stuff.
 458  * Called during T 'n L context destruction.
 459  */
 460 void _tnl_array_destroy( GLcontext *ctx )
 461 {
 462 }