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          assert(last_prim->start > 0);
 121          src -= sz;
 122       }
 123       /* fall-through */
 124    case GL_TRIANGLE_FAN:
 125    case GL_POLYGON:
 126       if (nr == 0) {
 127          return 0;
 128       }
 129       else if (nr == 1) {
 130          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 131          return 1;
 132       }
 133       else {
 134          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 135          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 136          return 2;
 137       }
 138    case GL_TRIANGLE_STRIP:
 139       /* no parity issue, but need to make sure the tri is not drawn twice */
 140       if (nr & 1) {
 141          last_prim->count--;
 142       }
 143       /* fallthrough */
 144    case GL_QUAD_STRIP:
 145       switch (nr) {
 146       case 0:
 147          ovf = 0;
 148          break;
 149       case 1:
 150          ovf = 1;
 151          break;
 152       default:
 153          ovf = 2 + (nr & 1);
 154          break;
 155       }
 156       for (i = 0 ; i < ovf ; i++)
 157          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 158       return i;
 159    case PRIM_OUTSIDE_BEGIN_END:
 160       return 0;
 161    default:
 162       assert(0);
 163       return 0;
 164    }
 165 }
 166
 167
 168
 169 /* TODO: populate these as the vertex is defined:
 170  */
 171 static void
 172 vbo_exec_bind_arrays( struct gl_context *ctx )
 173 {
 174    struct vbo_context *vbo = vbo_context(ctx);
 175    struct vbo_exec_context *exec = &vbo->exec;
 176    struct gl_client_array *arrays = exec->vtx.arrays;
 177    const GLuint *map;
 178    GLuint attr;
 179    GLbitfield64 varying_inputs = 0x0;
 180
 181    /* Install the default (ie Current) attributes first, then overlay
 182     * all active ones.
 183     */
 184    switch (get_program_mode(exec->ctx)) {
 185    case VP_NONE:
 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 < MAT_ATTRIB_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_MAT_FRONT_AMBIENT+attr];
 193       }
 194       map = vbo->map_vp_none;
 195       break;
 196    case VP_ARB:
 197       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 198          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 199       }
 200       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 201          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 202          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 203             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 204       }
 205       map = vbo->map_vp_arb;
 206
 207       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 208        * In that case we effectively need to route the data from
 209        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 210        */
 211       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 212           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 213          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 214          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 215          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 216          exec->vtx.attrsz[0] = 0;
 217       }
 218       break;
 219    default:
 220       assert(0);
 221    }
 222
 223    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 224       const GLuint src = map[attr];
 225
 226       if (exec->vtx.attrsz[src]) {
 227          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 228             (GLbyte *)exec->vtx.vertex;
 229
 230          /* override the default array set above */
 231          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 232          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 233          exec->vtx.inputs[attr] = &arrays[attr];
 234
 235          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 236             /* a real buffer obj: Ptr is an offset, not a pointer */
 237             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 238             assert(offset >= 0);
 239             arrays[attr].Ptr = (GLubyte *)
 240                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 241          }
 242          else {
 243             /* Ptr into ordinary app memory */
 244             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 245          }
 246          arrays[attr].Size = exec->vtx.attrsz[src];
 247          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 248          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 249          arrays[attr].Type = exec->vtx.attrtype[src];
 250          arrays[attr].Integer =
 251                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 252          arrays[attr].Format = GL_RGBA;
 253          arrays[attr].Enabled = 1;
 254          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 255          _mesa_reference_buffer_object(ctx,
 256                                        &arrays[attr].BufferObj,
 257                                        exec->vtx.bufferobj);
 258
 259          varying_inputs |= VERT_BIT(attr);
 260       }
 261    }
 262
 263    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 264    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 265 }
 266
 267
 268 /**
 269  * Unmap the VBO.  This is called before drawing.
 270  */
 271 static void
 272 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 273 {
 274    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 275       struct gl_context *ctx = exec->ctx;
 276
 277       if (ctx->Driver.FlushMappedBufferRange) {
 278          GLintptr offset = exec->vtx.buffer_used -
 279                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 280          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 281                              sizeof(float);
 282
 283          if (length)
 284             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 285                                                exec->vtx.bufferobj,
 286                                                MAP_INTERNAL);
 287       }
 288
 289       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 290                                 exec->vtx.buffer_map) * sizeof(float);
 291
 292       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 293       assert(exec->vtx.buffer_ptr != NULL);
 294
 295       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 296       exec->vtx.buffer_map = NULL;
 297       exec->vtx.buffer_ptr = NULL;
 298       exec->vtx.max_vert = 0;
 299    }
 300 }
 301
 302
 303 /**
 304  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 305  */
 306 void
 307 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 308 {
 309    struct gl_context *ctx = exec->ctx;
 310    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 311                               GL_MAP_INVALIDATE_RANGE_BIT |
 312                               GL_MAP_UNSYNCHRONIZED_BIT |
 313                               GL_MAP_FLUSH_EXPLICIT_BIT |
 314                               MESA_MAP_NOWAIT_BIT;
 315    const GLenum usage = GL_STREAM_DRAW_ARB;
 316
 317    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 318       return;
 319
 320    assert(!exec->vtx.buffer_map);
 321    assert(!exec->vtx.buffer_ptr);
 322
 323    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 324       /* The VBO exists and there's room for more */
 325       if (exec->vtx.bufferobj->Size > 0) {
 326          exec->vtx.buffer_map =
 327             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 328                                                   exec->vtx.buffer_used,
 329                                                   (VBO_VERT_BUFFER_SIZE -
 330                                                    exec->vtx.buffer_used),
 331                                                   accessRange,
 332                                                   exec->vtx.bufferobj,
 333                                                   MAP_INTERNAL);
 334          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 335       }
 336       else {
 337          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 338       }
 339    }
 340
 341    if (!exec->vtx.buffer_map) {
 342       /* Need to allocate a new VBO */
 343       exec->vtx.buffer_used = 0;
 344
 345       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 346                                  VBO_VERT_BUFFER_SIZE,
 347                                  NULL, usage,
 348                                  GL_MAP_WRITE_BIT |
 349                                  GL_DYNAMIC_STORAGE_BIT |
 350                                  GL_CLIENT_STORAGE_BIT,
 351                                  exec->vtx.bufferobj)) {
 352          /* buffer allocation worked, now map the buffer */
 353          exec->vtx.buffer_map =
 354             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 355                                                   0, VBO_VERT_BUFFER_SIZE,
 356                                                   accessRange,
 357                                                   exec->vtx.bufferobj,
 358                                                   MAP_INTERNAL);
 359       }
 360       else {
 361          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 362          exec->vtx.buffer_map = NULL;
 363       }
 364    }
 365
 366    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 367
 368    if (!exec->vtx.buffer_map) {
 369       /* out of memory */
 370       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 371    }
 372    else {
 373       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 374          /* The no-op functions are installed so switch back to regular
 375           * functions.  We do this test just to avoid frequent and needless
 376           * calls to _mesa_install_exec_vtxfmt().
 377           */
 378          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 379       }
 380    }
 381
 382    if (0)
 383       printf("map %d..\n", exec->vtx.buffer_used);
 384 }
 385
 386
 387
 388 /**
 389  * Execute the buffer and save copied verts.
 390  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 391  */
 392 void
 393 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 394 {
 395    if (0)
 396       vbo_exec_debug_verts( exec );
 397
 398    if (exec->vtx.prim_count &&
 399        exec->vtx.vert_count) {
 400
 401       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 402
 403       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 404          struct gl_context *ctx = exec->ctx;
 405
 406          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 407           * from _mesa_set_varying_vp_inputs().
 408           */
 409          vbo_exec_bind_arrays( ctx );
 410
 411          if (ctx->NewState)
 412             _mesa_update_state( ctx );
 413
 414          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 415             vbo_exec_vtx_unmap( exec );
 416          }
 417
 418          if (0)
 419             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 420                    exec->vtx.vert_count);
 421
 422          vbo_context(ctx)->draw_prims( ctx,
 423                                        exec->vtx.prim,
 424                                        exec->vtx.prim_count,
 425                                        NULL,
 426                                        GL_TRUE,
 427                                        0,
 428                                        exec->vtx.vert_count - 1,
 429                                        NULL, 0, NULL);
 430
 431          /* If using a real VBO, get new storage -- unless asked not to.
 432           */
 433          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 434             vbo_exec_vtx_map( exec );
 435          }
 436       }
 437    }
 438
 439    /* May have to unmap explicitly if we didn't draw:
 440     */
 441    if (keepUnmapped &&
 442        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 443        exec->vtx.buffer_map) {
 444       vbo_exec_vtx_unmap( exec );
 445    }
 446
 447    if (keepUnmapped || exec->vtx.vertex_size == 0)
 448       exec->vtx.max_vert = 0;
 449    else
 450       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 451
 452    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 453    exec->vtx.prim_count = 0;
 454    exec->vtx.vert_count = 0;
 455 }