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    struct _mesa_prim *last_prim = &exec->vtx.prim[exec->vtx.prim_count - 1];
  79    const GLuint nr = last_prim->count;
  80    GLuint ovf, i;
  81    const GLuint sz = exec->vtx.vertex_size;
  82    fi_type *dst = exec->vtx.copied.buffer;
  83    const fi_type *src = exec->vtx.buffer_map + last_prim->start * sz;
  84
  85    switch (exec->ctx->Driver.CurrentExecPrimitive) {
  86    case GL_POINTS:
  87       return 0;
  88    case GL_LINES:
  89       ovf = nr&1;
  90       for (i = 0 ; i < ovf ; i++)
  91          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  92       return i;
  93    case GL_TRIANGLES:
  94       ovf = nr%3;
  95       for (i = 0 ; i < ovf ; i++)
  96          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  97       return i;
  98    case GL_QUADS:
  99       ovf = nr&3;
 100       for (i = 0 ; i < ovf ; i++)
 101          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 102       return i;
 103    case GL_LINE_STRIP:
 104       if (nr == 0) {
 105          return 0;
 106       }
 107       else {
 108          memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 109          return 1;
 110       }
 111    case GL_LINE_LOOP:
 112       if (last_prim->begin == 0) {
 113          /* We're dealing with the second or later section of a split/wrapped
 114           * GL_LINE_LOOP.  Since we're converting line loops to line strips,
 115           * we've already increment the last_prim->start counter by one to
 116           * skip the 0th vertex in the loop.  We need to undo that (effectively
 117           * subtract one from last_prim->start) so that we copy the 0th vertex
 118           * to the next vertex buffer.
 119           */
 120          src -= sz;
 121       }
 122       /* fall-through */
 123    case GL_TRIANGLE_FAN:
 124    case GL_POLYGON:
 125       if (nr == 0) {
 126          return 0;
 127       }
 128       else if (nr == 1) {
 129          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 130          return 1;
 131       }
 132       else {
 133          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 134          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 135          return 2;
 136       }
 137    case GL_TRIANGLE_STRIP:
 138       /* no parity issue, but need to make sure the tri is not drawn twice */
 139       if (nr & 1) {
 140          last_prim->count--;
 141       }
 142       /* fallthrough */
 143    case GL_QUAD_STRIP:
 144       switch (nr) {
 145       case 0:
 146          ovf = 0;
 147          break;
 148       case 1:
 149          ovf = 1;
 150          break;
 151       default:
 152          ovf = 2 + (nr & 1);
 153          break;
 154       }
 155       for (i = 0 ; i < ovf ; i++)
 156          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 157       return i;
 158    case PRIM_OUTSIDE_BEGIN_END:
 159       return 0;
 160    default:
 161       assert(0);
 162       return 0;
 163    }
 164 }
 165
 166
 167
 168 /* TODO: populate these as the vertex is defined:
 169  */
 170 static void
 171 vbo_exec_bind_arrays( struct gl_context *ctx )
 172 {
 173    struct vbo_context *vbo = vbo_context(ctx);
 174    struct vbo_exec_context *exec = &vbo->exec;
 175    struct gl_client_array *arrays = exec->vtx.arrays;
 176    const GLuint *map;
 177    GLuint attr;
 178    GLbitfield64 varying_inputs = 0x0;
 179
 180    /* Install the default (ie Current) attributes first, then overlay
 181     * all active ones.
 182     */
 183    switch (get_program_mode(exec->ctx)) {
 184    case VP_NONE:
 185       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 186          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 187       }
 188       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 189          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 190          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 191             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 192       }
 193       map = vbo->map_vp_none;
 194       break;
 195    case VP_ARB:
 196       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 197          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 198       }
 199       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 200          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 201          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 202             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 203       }
 204       map = vbo->map_vp_arb;
 205
 206       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 207        * In that case we effectively need to route the data from
 208        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 209        */
 210       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 211           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 212          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 213          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 214          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 215          exec->vtx.attrsz[0] = 0;
 216       }
 217       break;
 218    default:
 219       assert(0);
 220    }
 221
 222    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 223       const GLuint src = map[attr];
 224
 225       if (exec->vtx.attrsz[src]) {
 226          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 227             (GLbyte *)exec->vtx.vertex;
 228
 229          /* override the default array set above */
 230          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 231          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 232          exec->vtx.inputs[attr] = &arrays[attr];
 233
 234          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 235             /* a real buffer obj: Ptr is an offset, not a pointer */
 236             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 237             assert(offset >= 0);
 238             arrays[attr].Ptr = (GLubyte *)
 239                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 240          }
 241          else {
 242             /* Ptr into ordinary app memory */
 243             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 244          }
 245          arrays[attr].Size = exec->vtx.attrsz[src];
 246          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 247          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 248          arrays[attr].Type = exec->vtx.attrtype[src];
 249          arrays[attr].Integer =
 250                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 251          arrays[attr].Format = GL_RGBA;
 252          arrays[attr].Enabled = 1;
 253          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 254          _mesa_reference_buffer_object(ctx,
 255                                        &arrays[attr].BufferObj,
 256                                        exec->vtx.bufferobj);
 257
 258          varying_inputs |= VERT_BIT(attr);
 259       }
 260    }
 261
 262    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 263    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 264 }
 265
 266
 267 /**
 268  * Unmap the VBO.  This is called before drawing.
 269  */
 270 static void
 271 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 272 {
 273    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 274       struct gl_context *ctx = exec->ctx;
 275
 276       if (ctx->Driver.FlushMappedBufferRange) {
 277          GLintptr offset = exec->vtx.buffer_used -
 278                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 279          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 280                              sizeof(float);
 281
 282          if (length)
 283             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 284                                                exec->vtx.bufferobj,
 285                                                MAP_INTERNAL);
 286       }
 287
 288       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 289                                 exec->vtx.buffer_map) * sizeof(float);
 290
 291       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 292       assert(exec->vtx.buffer_ptr != NULL);
 293
 294       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 295       exec->vtx.buffer_map = NULL;
 296       exec->vtx.buffer_ptr = NULL;
 297       exec->vtx.max_vert = 0;
 298    }
 299 }
 300
 301
 302 /**
 303  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 304  */
 305 void
 306 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 307 {
 308    struct gl_context *ctx = exec->ctx;
 309    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 310                               GL_MAP_INVALIDATE_RANGE_BIT |
 311                               GL_MAP_UNSYNCHRONIZED_BIT |
 312                               GL_MAP_FLUSH_EXPLICIT_BIT |
 313                               MESA_MAP_NOWAIT_BIT;
 314    const GLenum usage = GL_STREAM_DRAW_ARB;
 315
 316    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 317       return;
 318
 319    assert(!exec->vtx.buffer_map);
 320    assert(!exec->vtx.buffer_ptr);
 321
 322    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 323       /* The VBO exists and there's room for more */
 324       if (exec->vtx.bufferobj->Size > 0) {
 325          exec->vtx.buffer_map =
 326             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 327                                                   exec->vtx.buffer_used,
 328                                                   (VBO_VERT_BUFFER_SIZE -
 329                                                    exec->vtx.buffer_used),
 330                                                   accessRange,
 331                                                   exec->vtx.bufferobj,
 332                                                   MAP_INTERNAL);
 333          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 334       }
 335       else {
 336          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 337       }
 338    }
 339
 340    if (!exec->vtx.buffer_map) {
 341       /* Need to allocate a new VBO */
 342       exec->vtx.buffer_used = 0;
 343
 344       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 345                                  VBO_VERT_BUFFER_SIZE,
 346                                  NULL, usage,
 347                                  GL_MAP_WRITE_BIT |
 348                                  GL_DYNAMIC_STORAGE_BIT |
 349                                  GL_CLIENT_STORAGE_BIT,
 350                                  exec->vtx.bufferobj)) {
 351          /* buffer allocation worked, now map the buffer */
 352          exec->vtx.buffer_map =
 353             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 354                                                   0, VBO_VERT_BUFFER_SIZE,
 355                                                   accessRange,
 356                                                   exec->vtx.bufferobj,
 357                                                   MAP_INTERNAL);
 358       }
 359       else {
 360          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 361          exec->vtx.buffer_map = NULL;
 362       }
 363    }
 364
 365    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 366
 367    if (!exec->vtx.buffer_map) {
 368       /* out of memory */
 369       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 370    }
 371    else {
 372       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 373          /* The no-op functions are installed so switch back to regular
 374           * functions.  We do this test just to avoid frequent and needless
 375           * calls to _mesa_install_exec_vtxfmt().
 376           */
 377          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 378       }
 379    }
 380
 381    if (0)
 382       printf("map %d..\n", exec->vtx.buffer_used);
 383 }
 384
 385
 386
 387 /**
 388  * Execute the buffer and save copied verts.
 389  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 390  */
 391 void
 392 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 393 {
 394    if (0)
 395       vbo_exec_debug_verts( exec );
 396
 397    if (exec->vtx.prim_count &&
 398        exec->vtx.vert_count) {
 399
 400       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 401
 402       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 403          struct gl_context *ctx = exec->ctx;
 404
 405          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 406           * from _mesa_set_varying_vp_inputs().
 407           */
 408          vbo_exec_bind_arrays( ctx );
 409
 410          if (ctx->NewState)
 411             _mesa_update_state( ctx );
 412
 413          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 414             vbo_exec_vtx_unmap( exec );
 415          }
 416
 417          if (0)
 418             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 419                    exec->vtx.vert_count);
 420
 421          vbo_context(ctx)->draw_prims( ctx,
 422                                        exec->vtx.prim,
 423                                        exec->vtx.prim_count,
 424                                        NULL,
 425                                        GL_TRUE,
 426                                        0,
 427                                        exec->vtx.vert_count - 1,
 428                                        NULL, 0, NULL);
 429
 430          /* If using a real VBO, get new storage -- unless asked not to.
 431           */
 432          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 433             vbo_exec_vtx_map( exec );
 434          }
 435       }
 436    }
 437
 438    /* May have to unmap explicitly if we didn't draw:
 439     */
 440    if (keepUnmapped &&
 441        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 442        exec->vtx.buffer_map) {
 443       vbo_exec_vtx_unmap( exec );
 444    }
 445
 446    if (keepUnmapped || exec->vtx.vertex_size == 0)
 447       exec->vtx.max_vert = 0;
 448    else
 449       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 450
 451    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 452    exec->vtx.prim_count = 0;
 453    exec->vtx.vert_count = 0;
 454 }