src/mesa/tnl/t_draw.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  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  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/imports.h"
  31 #include "main/state.h"
  32 #include "main/mtypes.h"
  33 #include "main/macros.h"
  34 #include "main/enums.h"
  35
  36 #include "t_context.h"
  37 #include "t_pipeline.h"
  38 #include "t_vp_build.h"
  39 #include "t_vertex.h"
  40 #include "tnl.h"
  41
  42
  43
  44 static GLubyte *get_space(GLcontext *ctx, GLuint bytes)
  45 {
  46    TNLcontext *tnl = TNL_CONTEXT(ctx);
  47    GLubyte *space = _mesa_malloc(bytes);
  48
  49    tnl->block[tnl->nr_blocks++] = space;
  50    return space;
  51 }
  52
  53
  54 static void free_space(GLcontext *ctx)
  55 {
  56    TNLcontext *tnl = TNL_CONTEXT(ctx);
  57    GLuint i;
  58    for (i = 0; i < tnl->nr_blocks; i++)
  59       _mesa_free(tnl->block[i]);
  60    tnl->nr_blocks = 0;
  61 }
  62
  63
  64 /* Convert the incoming array to GLfloats.  Understands the
  65  * array->Normalized flag and selects the correct conversion method.
  66  */
  67 #define CONVERT( TYPE, MACRO ) do {             \
  68    GLuint i, j;                                 \
  69    if (input->Normalized) {                     \
  70       for (i = 0; i < count; i++) {             \
  71          const TYPE *in = (TYPE *)ptr;          \
  72          for (j = 0; j < sz; j++) {             \
  73             *fptr++ = MACRO(*in);               \
  74             in++;                               \
  75          }                                      \
  76          ptr += input->StrideB;                 \
  77       }                                         \
  78    } else {                                     \
  79       for (i = 0; i < count; i++) {             \
  80          const TYPE *in = (TYPE *)ptr;          \
  81          for (j = 0; j < sz; j++) {             \
  82             *fptr++ = (GLfloat)(*in);           \
  83             in++;                               \
  84          }                                      \
  85          ptr += input->StrideB;                 \
  86       }                                         \
  87    }                                            \
  88 } while (0)
  89
  90
  91 /**
  92  * Convert array of BGRA/GLubyte[4] values to RGBA/float[4]
  93  * \param ptr  input/ubyte array
  94  * \param fptr  output/float array
  95  */
  96 static void
  97 convert_bgra_to_float(const struct gl_client_array *input,
  98                       const GLubyte *ptr, GLfloat *fptr,
  99                       GLuint count )
 100 {
 101    GLuint i;
 102    assert(input->Normalized);
 103    assert(input->Size == 4);
 104    for (i = 0; i < count; i++) {
 105       const GLubyte *in = (GLubyte *) ptr;  /* in is in BGRA order */
 106       *fptr++ = UBYTE_TO_FLOAT(in[2]);  /* red */
 107       *fptr++ = UBYTE_TO_FLOAT(in[1]);  /* green */
 108       *fptr++ = UBYTE_TO_FLOAT(in[0]);  /* blue */
 109       *fptr++ = UBYTE_TO_FLOAT(in[3]);  /* alpha */
 110       ptr += input->StrideB;
 111    }
 112 }
 113
 114
 115 /* Adjust pointer to point at first requested element, convert to
 116  * floating point, populate VB->AttribPtr[].
 117  */
 118 static void _tnl_import_array( GLcontext *ctx,
 119                                GLuint attrib,
 120                                GLuint count,
 121                                const struct gl_client_array *input,
 122                                const GLubyte *ptr )
 123 {
 124    TNLcontext *tnl = TNL_CONTEXT(ctx);
 125    struct vertex_buffer *VB = &tnl->vb;
 126    GLuint stride = input->StrideB;
 127
 128    if (input->Type != GL_FLOAT) {
 129       const GLuint sz = input->Size;
 130       GLubyte *buf = get_space(ctx, count * sz * sizeof(GLfloat));
 131       GLfloat *fptr = (GLfloat *)buf;
 132
 133       switch (input->Type) {
 134       case GL_BYTE:
 135          CONVERT(GLbyte, BYTE_TO_FLOAT);
 136          break;
 137       case GL_UNSIGNED_BYTE:
 138          if (input->Format == GL_BGRA) {
 139             /* See GL_EXT_vertex_array_bgra */
 140             convert_bgra_to_float(input, ptr, fptr, count);
 141          }
 142          else {
 143             CONVERT(GLubyte, UBYTE_TO_FLOAT);
 144          }
 145          break;
 146       case GL_SHORT:
 147          CONVERT(GLshort, SHORT_TO_FLOAT);
 148          break;
 149       case GL_UNSIGNED_SHORT:
 150          CONVERT(GLushort, USHORT_TO_FLOAT);
 151          break;
 152       case GL_INT:
 153          CONVERT(GLint, INT_TO_FLOAT);
 154          break;
 155       case GL_UNSIGNED_INT:
 156          CONVERT(GLuint, UINT_TO_FLOAT);
 157          break;
 158       case GL_DOUBLE:
 159          CONVERT(GLdouble, (GLfloat));
 160          break;
 161       default:
 162          assert(0);
 163          break;
 164       }
 165
 166       ptr = buf;
 167       stride = sz * sizeof(GLfloat);
 168    }
 169
 170    VB->AttribPtr[attrib] = &tnl->tmp_inputs[attrib];
 171    VB->AttribPtr[attrib]->data = (GLfloat (*)[4])ptr;
 172    VB->AttribPtr[attrib]->start = (GLfloat *)ptr;
 173    VB->AttribPtr[attrib]->count = count;
 174    VB->AttribPtr[attrib]->stride = stride;
 175    VB->AttribPtr[attrib]->size = input->Size;
 176
 177    /* This should die, but so should the whole GLvector4f concept:
 178     */
 179    VB->AttribPtr[attrib]->flags = (((1<<input->Size)-1) |
 180                                    VEC_NOT_WRITEABLE |
 181                                    (stride == 4*sizeof(GLfloat) ? 0 : VEC_BAD_STRIDE));
 182
 183    VB->AttribPtr[attrib]->storage = NULL;
 184 }
 185
 186 #define CLIPVERTS  ((6 + MAX_CLIP_PLANES) * 2)
 187
 188
 189 static GLboolean *_tnl_import_edgeflag( GLcontext *ctx,
 190                                         const GLvector4f *input,
 191                                         GLuint count)
 192 {
 193    const GLubyte *ptr = (const GLubyte *)input->data;
 194    const GLuint stride = input->stride;
 195    GLboolean *space = (GLboolean *)get_space(ctx, count + CLIPVERTS);
 196    GLboolean *bptr = space;
 197    GLuint i;
 198
 199    for (i = 0; i < count; i++) {
 200       *bptr++ = ((GLfloat *)ptr)[0] == 1.0;
 201       ptr += stride;
 202    }
 203
 204    return space;
 205 }
 206
 207
 208 static void bind_inputs( GLcontext *ctx,
 209                          const struct gl_client_array *inputs[],
 210                          GLint count,
 211                          struct gl_buffer_object **bo,
 212                          GLuint *nr_bo )
 213 {
 214    TNLcontext *tnl = TNL_CONTEXT(ctx);
 215    struct vertex_buffer *VB = &tnl->vb;
 216    GLuint i;
 217
 218    /* Map all the VBOs
 219     */
 220    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 221       const void *ptr;
 222
 223       if (inputs[i]->BufferObj->Name) {
 224          if (!inputs[i]->BufferObj->Pointer) {
 225             bo[*nr_bo] = inputs[i]->BufferObj;
 226             (*nr_bo)++;
 227             ctx->Driver.MapBuffer(ctx,
 228                                   GL_ARRAY_BUFFER,
 229                                   GL_READ_ONLY_ARB,
 230                                   inputs[i]->BufferObj);
 231
 232             assert(inputs[i]->BufferObj->Pointer);
 233          }
 234
 235          ptr = ADD_POINTERS(inputs[i]->BufferObj->Pointer,
 236                             inputs[i]->Ptr);
 237       }
 238       else
 239          ptr = inputs[i]->Ptr;
 240
 241       /* Just make sure the array is floating point, otherwise convert to
 242        * temporary storage.
 243        *
 244        * XXX: remove the GLvector4f type at some stage and just use
 245        * client arrays.
 246        */
 247       _tnl_import_array(ctx, i, count, inputs[i], ptr);
 248    }
 249
 250    /* We process only the vertices between min & max index:
 251     */
 252    VB->Count = count;
 253
 254    /* These should perhaps be part of _TNL_ATTRIB_* */
 255    VB->BackfaceColorPtr = NULL;
 256    VB->BackfaceIndexPtr = NULL;
 257    VB->BackfaceSecondaryColorPtr = NULL;
 258
 259    /* Clipping and drawing code still requires this to be a packed
 260     * array of ubytes which can be written into.  TODO: Fix and
 261     * remove.
 262     */
 263    if (ctx->Polygon.FrontMode != GL_FILL ||
 264        ctx->Polygon.BackMode != GL_FILL)
 265    {
 266       VB->EdgeFlag = _tnl_import_edgeflag( ctx,
 267                                            VB->AttribPtr[_TNL_ATTRIB_EDGEFLAG],
 268                                            VB->Count );
 269    }
 270    else {
 271       /* the data previously pointed to by EdgeFlag may have been freed */
 272       VB->EdgeFlag = NULL;
 273    }
 274 }
 275
 276
 277 /* Translate indices to GLuints and store in VB->Elts.
 278  */
 279 static void bind_indices( GLcontext *ctx,
 280                           const struct _mesa_index_buffer *ib,
 281                           struct gl_buffer_object **bo,
 282                           GLuint *nr_bo)
 283 {
 284    TNLcontext *tnl = TNL_CONTEXT(ctx);
 285    struct vertex_buffer *VB = &tnl->vb;
 286    GLuint i;
 287    void *ptr;
 288
 289    if (!ib) {
 290       VB->Elts = NULL;
 291       return;
 292    }
 293
 294    if (ib->obj->Name && !ib->obj->Pointer) {
 295       bo[*nr_bo] = ib->obj;
 296       (*nr_bo)++;
 297       ctx->Driver.MapBuffer(ctx,
 298                             GL_ELEMENT_ARRAY_BUFFER,
 299                             GL_READ_ONLY_ARB,
 300                             ib->obj);
 301
 302       assert(ib->obj->Pointer);
 303    }
 304
 305    ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
 306
 307    if (ib->type == GL_UNSIGNED_INT && VB->Primitive[0].basevertex == 0) {
 308       VB->Elts = (GLuint *) ptr;
 309    }
 310    else {
 311       GLuint *elts = (GLuint *)get_space(ctx, ib->count * sizeof(GLuint));
 312       VB->Elts = elts;
 313
 314       if (ib->type == GL_UNSIGNED_INT) {
 315          const GLuint *in = (GLuint *)ptr;
 316          for (i = 0; i < ib->count; i++)
 317             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 318       }
 319       else if (ib->type == GL_UNSIGNED_SHORT) {
 320          const GLushort *in = (GLushort *)ptr;
 321          for (i = 0; i < ib->count; i++)
 322             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 323       }
 324       else {
 325          const GLubyte *in = (GLubyte *)ptr;
 326          for (i = 0; i < ib->count; i++)
 327             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 328       }
 329    }
 330 }
 331
 332 static void bind_prims( GLcontext *ctx,
 333                         const struct _mesa_prim *prim,
 334                         GLuint nr_prims )
 335 {
 336    TNLcontext *tnl = TNL_CONTEXT(ctx);
 337    struct vertex_buffer *VB = &tnl->vb;
 338
 339    VB->Primitive = prim;
 340    VB->PrimitiveCount = nr_prims;
 341 }
 342
 343 static void unmap_vbos( GLcontext *ctx,
 344                         struct gl_buffer_object **bo,
 345                         GLuint nr_bo )
 346 {
 347    GLuint i;
 348    for (i = 0; i < nr_bo; i++) {
 349       ctx->Driver.UnmapBuffer(ctx,
 350                               0, /* target -- I don't see why this would be needed */
 351                               bo[i]);
 352    }
 353 }
 354
 355
 356 void _tnl_vbo_draw_prims(GLcontext *ctx,
 357                          const struct gl_client_array *arrays[],
 358                          const struct _mesa_prim *prim,
 359                          GLuint nr_prims,
 360                          const struct _mesa_index_buffer *ib,
 361                          GLboolean index_bounds_valid,
 362                          GLuint min_index,
 363                          GLuint max_index)
 364 {
 365    if (!index_bounds_valid)
 366       vbo_get_minmax_index(ctx, prim, ib, &min_index, &max_index);
 367
 368    _tnl_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);
 369 }
 370
 371 /* This is the main entrypoint into the slimmed-down software tnl
 372  * module.  In a regular swtnl driver, this can be plugged straight
 373  * into the vbo->Driver.DrawPrims() callback.
 374  */
 375 void _tnl_draw_prims( GLcontext *ctx,
 376                       const struct gl_client_array *arrays[],
 377                       const struct _mesa_prim *prim,
 378                       GLuint nr_prims,
 379                       const struct _mesa_index_buffer *ib,
 380                       GLuint min_index,
 381                       GLuint max_index)
 382 {
 383    TNLcontext *tnl = TNL_CONTEXT(ctx);
 384    const GLuint TEST_SPLIT = 0;
 385    const GLint max = TEST_SPLIT ? 8 : tnl->vb.Size - MAX_CLIPPED_VERTICES;
 386    GLuint max_basevertex = prim->basevertex;
 387    GLuint i;
 388
 389    for (i = 1; i < nr_prims; i++)
 390       max_basevertex = MAX2(max_basevertex, prim[i].basevertex);
 391
 392    if (0)
 393    {
 394       _mesa_printf("%s %d..%d\n", __FUNCTION__, min_index, max_index);
 395       for (i = 0; i < nr_prims; i++)
 396          _mesa_printf("prim %d: %s start %d count %d\n", i,
 397                       _mesa_lookup_enum_by_nr(prim[i].mode),
 398                       prim[i].start,
 399                       prim[i].count);
 400    }
 401
 402    if (min_index) {
 403       /* We always translate away calls with min_index != 0.
 404        */
 405       vbo_rebase_prims( ctx, arrays, prim, nr_prims, ib,
 406                         min_index, max_index,
 407                         _tnl_vbo_draw_prims );
 408       return;
 409    }
 410    else if (max_index + max_basevertex > max) {
 411       /* The software TNL pipeline has a fixed amount of storage for
 412        * vertices and it is necessary to split incoming drawing commands
 413        * if they exceed that limit.
 414        */
 415       struct split_limits limits;
 416       limits.max_verts = max;
 417       limits.max_vb_size = ~0;
 418       limits.max_indices = ~0;
 419
 420       /* This will split the buffers one way or another and
 421        * recursively call back into this function.
 422        */
 423       vbo_split_prims( ctx, arrays, prim, nr_prims, ib,
 424                        0, max_index + prim->basevertex,
 425                        _tnl_vbo_draw_prims,
 426                        &limits );
 427    }
 428    else {
 429       /* May need to map a vertex buffer object for every attribute plus
 430        * one for the index buffer.
 431        */
 432       struct gl_buffer_object *bo[VERT_ATTRIB_MAX + 1];
 433       GLuint nr_bo = 0;
 434
 435       for (i = 0; i < nr_prims;) {
 436          GLuint this_nr_prims;
 437
 438          /* Our SW TNL pipeline doesn't handle basevertex yet, so bind_indices
 439           * will rebase the elements to the basevertex, and we'll only
 440           * emit strings of prims with the same basevertex in one draw call.
 441           */
 442          for (this_nr_prims = 1; i + this_nr_prims < nr_prims;
 443               this_nr_prims++) {
 444             if (prim[i].basevertex != prim[i + this_nr_prims].basevertex)
 445                break;
 446          }
 447
 448          /* Binding inputs may imply mapping some vertex buffer objects.
 449           * They will need to be unmapped below.
 450           */
 451          bind_prims(ctx, &prim[i], this_nr_prims);
 452          bind_inputs(ctx, arrays, max_index + prim[i].basevertex + 1,
 453                      bo, &nr_bo);
 454          bind_indices(ctx, ib, bo, &nr_bo);
 455
 456          TNL_CONTEXT(ctx)->Driver.RunPipeline(ctx);
 457
 458          unmap_vbos(ctx, bo, nr_bo);
 459          free_space(ctx);
 460
 461          i += this_nr_prims;
 462       }
 463    }
 464 }
 465