src/mesa/vbo/vbo_exec_draw.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com>
  26  */
  27
  28 #include <stdio.h>
  29 #include "main/glheader.h"
  30 #include "main/bufferobj.h"
  31 #include "main/compiler.h"
  32 #include "main/context.h"
  33 #include "main/enums.h"
  34 #include "main/state.h"
  35 #include "main/vtxfmt.h"
  36
  37 #include "vbo_context.h"
  38 #include "vbo_noop.h"
  39
  40
  41 static void
  42 vbo_exec_debug_verts( struct vbo_exec_context *exec )
  43 {
  44    GLuint count = exec->vtx.vert_count;
  45    GLuint i;
  46
  47    printf("%s: %u vertices %d primitives, %d vertsize\n",
  48           __func__,
  49           count,
  50           exec->vtx.prim_count,
  51           exec->vtx.vertex_size);
  52
  53    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  54       struct _mesa_prim *prim = &exec->vtx.prim[i];
  55       printf("   prim %d: %s%s %d..%d %s %s\n",
  56              i,
  57              _mesa_lookup_prim_by_nr(prim->mode),
  58              prim->weak ? " (weak)" : "",
  59              prim->start,
  60              prim->start + prim->count,
  61              prim->begin ? "BEGIN" : "(wrap)",
  62              prim->end ? "END" : "(wrap)");
  63    }
  64 }
  65
  66
  67 /**
  68  * Copy zero, one or two vertices from the current vertex buffer into
  69  * the temporary "copy" buffer.
  70  * This is used when a single primitive overflows a vertex buffer and
  71  * we need to continue the primitive in a new vertex buffer.
  72  * The temporary "copy" buffer holds the vertices which need to get
  73  * copied from the old buffer to the new one.
  74  */
  75 static GLuint
  76 vbo_copy_vertices( struct vbo_exec_context *exec )
  77 {
  78    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
  79    GLuint ovf, i;
  80    GLuint sz = exec->vtx.vertex_size;
  81    fi_type *dst = exec->vtx.copied.buffer;
  82    const fi_type *src = (exec->vtx.buffer_map +
  83                          exec->vtx.prim[exec->vtx.prim_count-1].start *
  84                          exec->vtx.vertex_size);
  85
  86    switch (exec->ctx->Driver.CurrentExecPrimitive) {
  87    case GL_POINTS:
  88       return 0;
  89    case GL_LINES:
  90       ovf = nr&1;
  91       for (i = 0 ; i < ovf ; i++)
  92          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  93       return i;
  94    case GL_TRIANGLES:
  95       ovf = nr%3;
  96       for (i = 0 ; i < ovf ; i++)
  97          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  98       return i;
  99    case GL_QUADS:
 100       ovf = nr&3;
 101       for (i = 0 ; i < ovf ; i++)
 102          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 103       return i;
 104    case GL_LINE_STRIP:
 105       if (nr == 0) {
 106          return 0;
 107       }
 108       else {
 109          memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 110          return 1;
 111       }
 112    case GL_LINE_LOOP:
 113    case GL_TRIANGLE_FAN:
 114    case GL_POLYGON:
 115       if (nr == 0) {
 116          return 0;
 117       }
 118       else if (nr == 1) {
 119          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 120          return 1;
 121       }
 122       else {
 123          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 124          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 125          return 2;
 126       }
 127    case GL_TRIANGLE_STRIP:
 128       /* no parity issue, but need to make sure the tri is not drawn twice */
 129       if (nr & 1) {
 130          exec->vtx.prim[exec->vtx.prim_count-1].count--;
 131       }
 132       /* fallthrough */
 133    case GL_QUAD_STRIP:
 134       switch (nr) {
 135       case 0:
 136          ovf = 0;
 137          break;
 138       case 1:
 139          ovf = 1;
 140          break;
 141       default:
 142          ovf = 2 + (nr & 1);
 143          break;
 144       }
 145       for (i = 0 ; i < ovf ; i++)
 146          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 147       return i;
 148    case PRIM_OUTSIDE_BEGIN_END:
 149       return 0;
 150    default:
 151       assert(0);
 152       return 0;
 153    }
 154 }
 155
 156
 157
 158 /* TODO: populate these as the vertex is defined:
 159  */
 160 static void
 161 vbo_exec_bind_arrays( struct gl_context *ctx )
 162 {
 163    struct vbo_context *vbo = vbo_context(ctx);
 164    struct vbo_exec_context *exec = &vbo->exec;
 165    struct gl_client_array *arrays = exec->vtx.arrays;
 166    const GLuint *map;
 167    GLuint attr;
 168    GLbitfield64 varying_inputs = 0x0;
 169
 170    /* Install the default (ie Current) attributes first, then overlay
 171     * all active ones.
 172     */
 173    switch (get_program_mode(exec->ctx)) {
 174    case VP_NONE:
 175       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 176          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 177       }
 178       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 179          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 180          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 181             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 182       }
 183       map = vbo->map_vp_none;
 184       break;
 185    case VP_ARB:
 186       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 187          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 188       }
 189       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 190          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 191          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 192             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 193       }
 194       map = vbo->map_vp_arb;
 195
 196       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 197        * In that case we effectively need to route the data from
 198        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 199        */
 200       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 201           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 202          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 203          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 204          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 205          exec->vtx.attrsz[0] = 0;
 206       }
 207       break;
 208    default:
 209       assert(0);
 210    }
 211
 212    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 213       const GLuint src = map[attr];
 214
 215       if (exec->vtx.attrsz[src]) {
 216          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 217             (GLbyte *)exec->vtx.vertex;
 218
 219          /* override the default array set above */
 220          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 221          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 222          exec->vtx.inputs[attr] = &arrays[attr];
 223
 224          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 225             /* a real buffer obj: Ptr is an offset, not a pointer */
 226             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 227             assert(offset >= 0);
 228             arrays[attr].Ptr = (GLubyte *)
 229                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 230          }
 231          else {
 232             /* Ptr into ordinary app memory */
 233             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 234          }
 235          arrays[attr].Size = exec->vtx.attrsz[src];
 236          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 237          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 238          arrays[attr].Type = exec->vtx.attrtype[src];
 239          arrays[attr].Integer =
 240                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 241          arrays[attr].Format = GL_RGBA;
 242          arrays[attr].Enabled = 1;
 243          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 244          _mesa_reference_buffer_object(ctx,
 245                                        &arrays[attr].BufferObj,
 246                                        exec->vtx.bufferobj);
 247
 248          varying_inputs |= VERT_BIT(attr);
 249       }
 250    }
 251
 252    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 253    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 254 }
 255
 256
 257 /**
 258  * Unmap the VBO.  This is called before drawing.
 259  */
 260 static void
 261 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 262 {
 263    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 264       struct gl_context *ctx = exec->ctx;
 265
 266       if (ctx->Driver.FlushMappedBufferRange) {
 267          GLintptr offset = exec->vtx.buffer_used -
 268                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 269          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 270                              sizeof(float);
 271
 272          if (length)
 273             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 274                                                exec->vtx.bufferobj,
 275                                                MAP_INTERNAL);
 276       }
 277
 278       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 279                                 exec->vtx.buffer_map) * sizeof(float);
 280
 281       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 282       assert(exec->vtx.buffer_ptr != NULL);
 283
 284       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 285       exec->vtx.buffer_map = NULL;
 286       exec->vtx.buffer_ptr = NULL;
 287       exec->vtx.max_vert = 0;
 288    }
 289 }
 290
 291
 292 /**
 293  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 294  */
 295 void
 296 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 297 {
 298    struct gl_context *ctx = exec->ctx;
 299    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 300                               GL_MAP_INVALIDATE_RANGE_BIT |
 301                               GL_MAP_UNSYNCHRONIZED_BIT |
 302                               GL_MAP_FLUSH_EXPLICIT_BIT |
 303                               MESA_MAP_NOWAIT_BIT;
 304    const GLenum usage = GL_STREAM_DRAW_ARB;
 305
 306    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 307       return;
 308
 309    assert(!exec->vtx.buffer_map);
 310    assert(!exec->vtx.buffer_ptr);
 311
 312    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 313       /* The VBO exists and there's room for more */
 314       if (exec->vtx.bufferobj->Size > 0) {
 315          exec->vtx.buffer_map =
 316             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 317                                                   exec->vtx.buffer_used,
 318                                                   (VBO_VERT_BUFFER_SIZE -
 319                                                    exec->vtx.buffer_used),
 320                                                   accessRange,
 321                                                   exec->vtx.bufferobj,
 322                                                   MAP_INTERNAL);
 323          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 324       }
 325       else {
 326          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 327       }
 328    }
 329
 330    if (!exec->vtx.buffer_map) {
 331       /* Need to allocate a new VBO */
 332       exec->vtx.buffer_used = 0;
 333
 334       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 335                                  VBO_VERT_BUFFER_SIZE,
 336                                  NULL, usage,
 337                                  GL_MAP_WRITE_BIT |
 338                                  GL_DYNAMIC_STORAGE_BIT |
 339                                  GL_CLIENT_STORAGE_BIT,
 340                                  exec->vtx.bufferobj)) {
 341          /* buffer allocation worked, now map the buffer */
 342          exec->vtx.buffer_map =
 343             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 344                                                   0, VBO_VERT_BUFFER_SIZE,
 345                                                   accessRange,
 346                                                   exec->vtx.bufferobj,
 347                                                   MAP_INTERNAL);
 348       }
 349       else {
 350          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 351          exec->vtx.buffer_map = NULL;
 352       }
 353    }
 354
 355    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 356
 357    if (!exec->vtx.buffer_map) {
 358       /* out of memory */
 359       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 360    }
 361    else {
 362       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 363          /* The no-op functions are installed so switch back to regular
 364           * functions.  We do this test just to avoid frequent and needless
 365           * calls to _mesa_install_exec_vtxfmt().
 366           */
 367          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 368       }
 369    }
 370
 371    if (0)
 372       printf("map %d..\n", exec->vtx.buffer_used);
 373 }
 374
 375
 376
 377 /**
 378  * Execute the buffer and save copied verts.
 379  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 380  */
 381 void
 382 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 383 {
 384    if (0)
 385       vbo_exec_debug_verts( exec );
 386
 387    if (exec->vtx.prim_count &&
 388        exec->vtx.vert_count) {
 389
 390       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 391
 392       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 393          struct gl_context *ctx = exec->ctx;
 394
 395          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 396           * from _mesa_set_varying_vp_inputs().
 397           */
 398          vbo_exec_bind_arrays( ctx );
 399
 400          if (ctx->NewState)
 401             _mesa_update_state( ctx );
 402
 403          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 404             vbo_exec_vtx_unmap( exec );
 405          }
 406
 407          if (0)
 408             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 409                    exec->vtx.vert_count);
 410
 411          vbo_context(ctx)->draw_prims( ctx,
 412                                        exec->vtx.prim,
 413                                        exec->vtx.prim_count,
 414                                        NULL,
 415                                        GL_TRUE,
 416                                        0,
 417                                        exec->vtx.vert_count - 1,
 418                                        NULL, 0, NULL);
 419
 420          /* If using a real VBO, get new storage -- unless asked not to.
 421           */
 422          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 423             vbo_exec_vtx_map( exec );
 424          }
 425       }
 426    }
 427
 428    /* May have to unmap explicitly if we didn't draw:
 429     */
 430    if (keepUnmapped &&
 431        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 432        exec->vtx.buffer_map) {
 433       vbo_exec_vtx_unmap( exec );
 434    }
 435
 436    if (keepUnmapped || exec->vtx.vertex_size == 0)
 437       exec->vtx.max_vert = 0;
 438    else
 439       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 440                             (exec->vtx.vertex_size * sizeof(GLfloat)));
 441
 442    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 443    exec->vtx.prim_count = 0;
 444    exec->vtx.vert_count = 0;
 445 }