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/bufferobj.h"
  30 #include "main/condrender.h"
  31 #include "main/context.h"
  32 #include "main/imports.h"
  33 #include "main/mtypes.h"
  34 #include "main/macros.h"
  35 #include "main/enums.h"
  36
  37 #include "t_context.h"
  38 #include "tnl.h"
  39
  40
  41
  42 static GLubyte *get_space(struct gl_context *ctx, GLuint bytes)
  43 {
  44    TNLcontext *tnl = TNL_CONTEXT(ctx);
  45    GLubyte *space = malloc(bytes);
  46
  47    tnl->block[tnl->nr_blocks++] = space;
  48    return space;
  49 }
  50
  51
  52 static void free_space(struct gl_context *ctx)
  53 {
  54    TNLcontext *tnl = TNL_CONTEXT(ctx);
  55    GLuint i;
  56    for (i = 0; i < tnl->nr_blocks; i++)
  57       free(tnl->block[i]);
  58    tnl->nr_blocks = 0;
  59 }
  60
  61
  62 /* Convert the incoming array to GLfloats.  Understands the
  63  * array->Normalized flag and selects the correct conversion method.
  64  */
  65 #define CONVERT( TYPE, MACRO ) do {             \
  66    GLuint i, j;                                 \
  67    if (input->Normalized) {                     \
  68       for (i = 0; i < count; i++) {             \
  69          const TYPE *in = (TYPE *)ptr;          \
  70          for (j = 0; j < sz; j++) {             \
  71             *fptr++ = MACRO(*in);               \
  72             in++;                               \
  73          }                                      \
  74          ptr += input->StrideB;                 \
  75       }                                         \
  76    } else {                                     \
  77       for (i = 0; i < count; i++) {             \
  78          const TYPE *in = (TYPE *)ptr;          \
  79          for (j = 0; j < sz; j++) {             \
  80             *fptr++ = (GLfloat)(*in);           \
  81             in++;                               \
  82          }                                      \
  83          ptr += input->StrideB;                 \
  84       }                                         \
  85    }                                            \
  86 } while (0)
  87
  88
  89 /**
  90  * Convert array of BGRA/GLubyte[4] values to RGBA/float[4]
  91  * \param ptr  input/ubyte array
  92  * \param fptr  output/float array
  93  */
  94 static void
  95 convert_bgra_to_float(const struct gl_client_array *input,
  96                       const GLubyte *ptr, GLfloat *fptr,
  97                       GLuint count )
  98 {
  99    GLuint i;
 100    assert(input->Normalized);
 101    assert(input->Size == 4);
 102    for (i = 0; i < count; i++) {
 103       const GLubyte *in = (GLubyte *) ptr;  /* in is in BGRA order */
 104       *fptr++ = UBYTE_TO_FLOAT(in[2]);  /* red */
 105       *fptr++ = UBYTE_TO_FLOAT(in[1]);  /* green */
 106       *fptr++ = UBYTE_TO_FLOAT(in[0]);  /* blue */
 107       *fptr++ = UBYTE_TO_FLOAT(in[3]);  /* alpha */
 108       ptr += input->StrideB;
 109    }
 110 }
 111
 112 static void
 113 convert_half_to_float(const struct gl_client_array *input,
 114                       const GLubyte *ptr, GLfloat *fptr,
 115                       GLuint count, GLuint sz)
 116 {
 117    GLuint i, j;
 118
 119    for (i = 0; i < count; i++) {
 120       GLhalfARB *in = (GLhalfARB *)ptr;
 121
 122       for (j = 0; j < sz; j++) {
 123          *fptr++ = _mesa_half_to_float(in[j]);
 124       }
 125       ptr += input->StrideB;
 126    }
 127 }
 128
 129 /**
 130  * \brief Convert fixed-point to floating-point.
 131  *
 132  * In OpenGL, a fixed-point number is a "signed 2's complement 16.16 scaled
 133  * integer" (Table 2.2 of the OpenGL ES 2.0 spec).
 134  *
 135  * If the buffer has the \c normalized flag set, the formula
 136  *     \code normalize(x) := (2*x + 1) / (2^16 - 1) \endcode
 137  * is used to map the fixed-point numbers into the range [-1, 1].
 138  */
 139 static void
 140 convert_fixed_to_float(const struct gl_client_array *input,
 141                        const GLubyte *ptr, GLfloat *fptr,
 142                        GLuint count)
 143 {
 144    GLuint i, j;
 145    const GLint size = input->Size;
 146
 147    if (input->Normalized) {
 148       for (i = 0; i < count; ++i) {
 149          const GLfixed *in = (GLfixed *) ptr;
 150          for (j = 0; j < size; ++j) {
 151             *fptr++ = (GLfloat) (2 * in[j] + 1) / (GLfloat) ((1 << 16) - 1);
 152          }
 153          ptr += input->StrideB;
 154       }
 155    } else {
 156       for (i = 0; i < count; ++i) {
 157          const GLfixed *in = (GLfixed *) ptr;
 158          for (j = 0; j < size; ++j) {
 159             *fptr++ = in[j] / (GLfloat) (1 << 16);
 160          }
 161          ptr += input->StrideB;
 162       }
 163    }
 164 }
 165
 166 /* Adjust pointer to point at first requested element, convert to
 167  * floating point, populate VB->AttribPtr[].
 168  */
 169 static void _tnl_import_array( struct gl_context *ctx,
 170                                GLuint attrib,
 171                                GLuint count,
 172                                const struct gl_client_array *input,
 173                                const GLubyte *ptr )
 174 {
 175    TNLcontext *tnl = TNL_CONTEXT(ctx);
 176    struct vertex_buffer *VB = &tnl->vb;
 177    GLuint stride = input->StrideB;
 178
 179    if (input->Type != GL_FLOAT) {
 180       const GLuint sz = input->Size;
 181       GLubyte *buf = get_space(ctx, count * sz * sizeof(GLfloat));
 182       GLfloat *fptr = (GLfloat *)buf;
 183
 184       switch (input->Type) {
 185       case GL_BYTE:
 186          CONVERT(GLbyte, BYTE_TO_FLOAT);
 187          break;
 188       case GL_UNSIGNED_BYTE:
 189          if (input->Format == GL_BGRA) {
 190             /* See GL_EXT_vertex_array_bgra */
 191             convert_bgra_to_float(input, ptr, fptr, count);
 192          }
 193          else {
 194             CONVERT(GLubyte, UBYTE_TO_FLOAT);
 195          }
 196          break;
 197       case GL_SHORT:
 198          CONVERT(GLshort, SHORT_TO_FLOAT);
 199          break;
 200       case GL_UNSIGNED_SHORT:
 201          CONVERT(GLushort, USHORT_TO_FLOAT);
 202          break;
 203       case GL_INT:
 204          CONVERT(GLint, INT_TO_FLOAT);
 205          break;
 206       case GL_UNSIGNED_INT:
 207          CONVERT(GLuint, UINT_TO_FLOAT);
 208          break;
 209       case GL_DOUBLE:
 210          CONVERT(GLdouble, (GLfloat));
 211          break;
 212       case GL_HALF_FLOAT:
 213          convert_half_to_float(input, ptr, fptr, count, sz);
 214          break;
 215       case GL_FIXED:
 216          convert_fixed_to_float(input, ptr, fptr, count);
 217          break;
 218       default:
 219          assert(0);
 220          break;
 221       }
 222
 223       ptr = buf;
 224       stride = sz * sizeof(GLfloat);
 225    }
 226
 227    VB->AttribPtr[attrib] = &tnl->tmp_inputs[attrib];
 228    VB->AttribPtr[attrib]->data = (GLfloat (*)[4])ptr;
 229    VB->AttribPtr[attrib]->start = (GLfloat *)ptr;
 230    VB->AttribPtr[attrib]->count = count;
 231    VB->AttribPtr[attrib]->stride = stride;
 232    VB->AttribPtr[attrib]->size = input->Size;
 233
 234    /* This should die, but so should the whole GLvector4f concept:
 235     */
 236    VB->AttribPtr[attrib]->flags = (((1<<input->Size)-1) |
 237                                    VEC_NOT_WRITEABLE |
 238                                    (stride == 4*sizeof(GLfloat) ? 0 : VEC_BAD_STRIDE));
 239
 240    VB->AttribPtr[attrib]->storage = NULL;
 241 }
 242
 243 #define CLIPVERTS  ((6 + MAX_CLIP_PLANES) * 2)
 244
 245
 246 static GLboolean *_tnl_import_edgeflag( struct gl_context *ctx,
 247                                         const GLvector4f *input,
 248                                         GLuint count)
 249 {
 250    const GLubyte *ptr = (const GLubyte *)input->data;
 251    const GLuint stride = input->stride;
 252    GLboolean *space = (GLboolean *)get_space(ctx, count + CLIPVERTS);
 253    GLboolean *bptr = space;
 254    GLuint i;
 255
 256    for (i = 0; i < count; i++) {
 257       *bptr++ = ((GLfloat *)ptr)[0] == 1.0;
 258       ptr += stride;
 259    }
 260
 261    return space;
 262 }
 263
 264
 265 static void bind_inputs( struct gl_context *ctx,
 266                          const struct gl_client_array *inputs[],
 267                          GLint count,
 268                          struct gl_buffer_object **bo,
 269                          GLuint *nr_bo )
 270 {
 271    TNLcontext *tnl = TNL_CONTEXT(ctx);
 272    struct vertex_buffer *VB = &tnl->vb;
 273    GLuint i;
 274
 275    /* Map all the VBOs
 276     */
 277    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 278       const void *ptr;
 279
 280       if (inputs[i]->BufferObj->Name) {
 281          if (!inputs[i]->BufferObj->Pointer) {
 282             bo[*nr_bo] = inputs[i]->BufferObj;
 283             (*nr_bo)++;
 284             ctx->Driver.MapBufferRange(ctx, 0, inputs[i]->BufferObj->Size,
 285                                        GL_MAP_READ_BIT,
 286                                        inputs[i]->BufferObj);
 287
 288             assert(inputs[i]->BufferObj->Pointer);
 289          }
 290
 291          ptr = ADD_POINTERS(inputs[i]->BufferObj->Pointer,
 292                             inputs[i]->Ptr);
 293       }
 294       else
 295          ptr = inputs[i]->Ptr;
 296
 297       /* Just make sure the array is floating point, otherwise convert to
 298        * temporary storage.
 299        *
 300        * XXX: remove the GLvector4f type at some stage and just use
 301        * client arrays.
 302        */
 303       _tnl_import_array(ctx, i, count, inputs[i], ptr);
 304    }
 305
 306    /* We process only the vertices between min & max index:
 307     */
 308    VB->Count = count;
 309
 310    /* These should perhaps be part of _TNL_ATTRIB_* */
 311    VB->BackfaceColorPtr = NULL;
 312    VB->BackfaceIndexPtr = NULL;
 313    VB->BackfaceSecondaryColorPtr = NULL;
 314
 315    /* Clipping and drawing code still requires this to be a packed
 316     * array of ubytes which can be written into.  TODO: Fix and
 317     * remove.
 318     */
 319    if (ctx->Polygon.FrontMode != GL_FILL ||
 320        ctx->Polygon.BackMode != GL_FILL)
 321    {
 322       VB->EdgeFlag = _tnl_import_edgeflag( ctx,
 323                                            VB->AttribPtr[_TNL_ATTRIB_EDGEFLAG],
 324                                            VB->Count );
 325    }
 326    else {
 327       /* the data previously pointed to by EdgeFlag may have been freed */
 328       VB->EdgeFlag = NULL;
 329    }
 330 }
 331
 332
 333 /* Translate indices to GLuints and store in VB->Elts.
 334  */
 335 static void bind_indices( struct gl_context *ctx,
 336                           const struct _mesa_index_buffer *ib,
 337                           struct gl_buffer_object **bo,
 338                           GLuint *nr_bo)
 339 {
 340    TNLcontext *tnl = TNL_CONTEXT(ctx);
 341    struct vertex_buffer *VB = &tnl->vb;
 342    GLuint i;
 343    const void *ptr;
 344
 345    if (!ib) {
 346       VB->Elts = NULL;
 347       return;
 348    }
 349
 350    if (_mesa_is_bufferobj(ib->obj) && !_mesa_bufferobj_mapped(ib->obj)) {
 351       /* if the buffer object isn't mapped yet, map it now */
 352       bo[*nr_bo] = ib->obj;
 353       (*nr_bo)++;
 354       ptr = ctx->Driver.MapBufferRange(ctx, (GLsizeiptr) ib->ptr,
 355                                        ib->count * vbo_sizeof_ib_type(ib->type),
 356                                        GL_MAP_READ_BIT, ib->obj);
 357       assert(ib->obj->Pointer);
 358    } else {
 359       /* user-space elements, or buffer already mapped */
 360       ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
 361    }
 362
 363    if (ib->type == GL_UNSIGNED_INT && VB->Primitive[0].basevertex == 0) {
 364       VB->Elts = (GLuint *) ptr;
 365    }
 366    else {
 367       GLuint *elts = (GLuint *)get_space(ctx, ib->count * sizeof(GLuint));
 368       VB->Elts = elts;
 369
 370       if (ib->type == GL_UNSIGNED_INT) {
 371          const GLuint *in = (GLuint *)ptr;
 372          for (i = 0; i < ib->count; i++)
 373             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 374       }
 375       else if (ib->type == GL_UNSIGNED_SHORT) {
 376          const GLushort *in = (GLushort *)ptr;
 377          for (i = 0; i < ib->count; i++)
 378             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 379       }
 380       else {
 381          const GLubyte *in = (GLubyte *)ptr;
 382          for (i = 0; i < ib->count; i++)
 383             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 384       }
 385    }
 386 }
 387
 388 static void bind_prims( struct gl_context *ctx,
 389                         const struct _mesa_prim *prim,
 390                         GLuint nr_prims )
 391 {
 392    TNLcontext *tnl = TNL_CONTEXT(ctx);
 393    struct vertex_buffer *VB = &tnl->vb;
 394
 395    VB->Primitive = prim;
 396    VB->PrimitiveCount = nr_prims;
 397 }
 398
 399 static void unmap_vbos( struct gl_context *ctx,
 400                         struct gl_buffer_object **bo,
 401                         GLuint nr_bo )
 402 {
 403    GLuint i;
 404    for (i = 0; i < nr_bo; i++) {
 405       ctx->Driver.UnmapBuffer(ctx, bo[i]);
 406    }
 407 }
 408
 409
 410 void _tnl_vbo_draw_prims(struct gl_context *ctx,
 411                          const struct _mesa_prim *prim,
 412                          GLuint nr_prims,
 413                          const struct _mesa_index_buffer *ib,
 414                          GLboolean index_bounds_valid,
 415                          GLuint min_index,
 416                          GLuint max_index,
 417                          struct gl_transform_feedback_object *tfb_vertcount)
 418 {
 419    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 420
 421    if (!index_bounds_valid)
 422       vbo_get_minmax_indices(ctx, prim, ib, &min_index, &max_index, nr_prims);
 423
 424    _tnl_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);
 425 }
 426
 427 /* This is the main entrypoint into the slimmed-down software tnl
 428  * module.  In a regular swtnl driver, this can be plugged straight
 429  * into the vbo->Driver.DrawPrims() callback.
 430  */
 431 void _tnl_draw_prims( struct gl_context *ctx,
 432                       const struct gl_client_array *arrays[],
 433                       const struct _mesa_prim *prim,
 434                       GLuint nr_prims,
 435                       const struct _mesa_index_buffer *ib,
 436                       GLuint min_index,
 437                       GLuint max_index)
 438 {
 439    TNLcontext *tnl = TNL_CONTEXT(ctx);
 440    const GLuint TEST_SPLIT = 0;
 441    const GLint max = TEST_SPLIT ? 8 : tnl->vb.Size - MAX_CLIPPED_VERTICES;
 442    GLint max_basevertex = prim->basevertex;
 443    GLuint i;
 444
 445    /* Mesa core state should have been validated already */
 446    assert(ctx->NewState == 0x0);
 447
 448    if (!_mesa_check_conditional_render(ctx))
 449       return; /* don't draw */
 450
 451    for (i = 1; i < nr_prims; i++)
 452       max_basevertex = MAX2(max_basevertex, prim[i].basevertex);
 453
 454    if (0)
 455    {
 456       printf("%s %d..%d\n", __FUNCTION__, min_index, max_index);
 457       for (i = 0; i < nr_prims; i++)
 458          printf("prim %d: %s start %d count %d\n", i,
 459                 _mesa_lookup_enum_by_nr(prim[i].mode),
 460                 prim[i].start,
 461                 prim[i].count);
 462    }
 463
 464    if (min_index) {
 465       /* We always translate away calls with min_index != 0.
 466        */
 467       vbo_rebase_prims( ctx, arrays, prim, nr_prims, ib,
 468                         min_index, max_index,
 469                         _tnl_vbo_draw_prims );
 470       return;
 471    }
 472    else if ((GLint)max_index + max_basevertex > max) {
 473       /* The software TNL pipeline has a fixed amount of storage for
 474        * vertices and it is necessary to split incoming drawing commands
 475        * if they exceed that limit.
 476        */
 477       struct split_limits limits;
 478       limits.max_verts = max;
 479       limits.max_vb_size = ~0;
 480       limits.max_indices = ~0;
 481
 482       /* This will split the buffers one way or another and
 483        * recursively call back into this function.
 484        */
 485       vbo_split_prims( ctx, arrays, prim, nr_prims, ib,
 486                        0, max_index + prim->basevertex,
 487                        _tnl_vbo_draw_prims,
 488                        &limits );
 489    }
 490    else {
 491       /* May need to map a vertex buffer object for every attribute plus
 492        * one for the index buffer.
 493        */
 494       struct gl_buffer_object *bo[VERT_ATTRIB_MAX + 1];
 495       GLuint nr_bo = 0;
 496       GLuint inst;
 497
 498       for (i = 0; i < nr_prims;) {
 499          GLuint this_nr_prims;
 500
 501          /* Our SW TNL pipeline doesn't handle basevertex yet, so bind_indices
 502           * will rebase the elements to the basevertex, and we'll only
 503           * emit strings of prims with the same basevertex in one draw call.
 504           */
 505          for (this_nr_prims = 1; i + this_nr_prims < nr_prims;
 506               this_nr_prims++) {
 507             if (prim[i].basevertex != prim[i + this_nr_prims].basevertex)
 508                break;
 509          }
 510
 511          assert(prim[i].num_instances > 0);
 512
 513          /* Binding inputs may imply mapping some vertex buffer objects.
 514           * They will need to be unmapped below.
 515           */
 516          for (inst = 0; inst < prim[i].num_instances; inst++) {
 517
 518             bind_prims(ctx, &prim[i], this_nr_prims);
 519             bind_inputs(ctx, arrays, max_index + prim[i].basevertex + 1,
 520                         bo, &nr_bo);
 521             bind_indices(ctx, ib, bo, &nr_bo);
 522
 523             tnl->CurInstance = inst;
 524             TNL_CONTEXT(ctx)->Driver.RunPipeline(ctx);
 525
 526             unmap_vbos(ctx, bo, nr_bo);
 527             free_space(ctx);
 528          }
 529
 530          i += this_nr_prims;
 531       }
 532    }
 533 }
 534