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    case GL_TRIANGLE_FAN:
 113    case GL_POLYGON:
 114       if (nr == 0) {
 115          return 0;
 116       }
 117       else if (nr == 1) {
 118          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 119          return 1;
 120       }
 121       else {
 122          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 123          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 124          return 2;
 125       }
 126    case GL_TRIANGLE_STRIP:
 127       /* no parity issue, but need to make sure the tri is not drawn twice */
 128       if (nr & 1) {
 129          last_prim->count--;
 130       }
 131       /* fallthrough */
 132    case GL_QUAD_STRIP:
 133       switch (nr) {
 134       case 0:
 135          ovf = 0;
 136          break;
 137       case 1:
 138          ovf = 1;
 139          break;
 140       default:
 141          ovf = 2 + (nr & 1);
 142          break;
 143       }
 144       for (i = 0 ; i < ovf ; i++)
 145          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 146       return i;
 147    case PRIM_OUTSIDE_BEGIN_END:
 148       return 0;
 149    default:
 150       assert(0);
 151       return 0;
 152    }
 153 }
 154
 155
 156
 157 /* TODO: populate these as the vertex is defined:
 158  */
 159 static void
 160 vbo_exec_bind_arrays( struct gl_context *ctx )
 161 {
 162    struct vbo_context *vbo = vbo_context(ctx);
 163    struct vbo_exec_context *exec = &vbo->exec;
 164    struct gl_client_array *arrays = exec->vtx.arrays;
 165    const GLuint *map;
 166    GLuint attr;
 167    GLbitfield64 varying_inputs = 0x0;
 168
 169    /* Install the default (ie Current) attributes first, then overlay
 170     * all active ones.
 171     */
 172    switch (get_program_mode(exec->ctx)) {
 173    case VP_NONE:
 174       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 175          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 176       }
 177       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 178          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 179          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 180             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 181       }
 182       map = vbo->map_vp_none;
 183       break;
 184    case VP_ARB:
 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 < VERT_ATTRIB_GENERIC_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_GENERIC0+attr];
 192       }
 193       map = vbo->map_vp_arb;
 194
 195       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 196        * In that case we effectively need to route the data from
 197        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 198        */
 199       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 200           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 201          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 202          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 203          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 204          exec->vtx.attrsz[0] = 0;
 205       }
 206       break;
 207    default:
 208       assert(0);
 209    }
 210
 211    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 212       const GLuint src = map[attr];
 213
 214       if (exec->vtx.attrsz[src]) {
 215          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 216             (GLbyte *)exec->vtx.vertex;
 217
 218          /* override the default array set above */
 219          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 220          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 221          exec->vtx.inputs[attr] = &arrays[attr];
 222
 223          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 224             /* a real buffer obj: Ptr is an offset, not a pointer */
 225             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 226             assert(offset >= 0);
 227             arrays[attr].Ptr = (GLubyte *)
 228                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 229          }
 230          else {
 231             /* Ptr into ordinary app memory */
 232             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 233          }
 234          arrays[attr].Size = exec->vtx.attrsz[src];
 235          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 236          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 237          arrays[attr].Type = exec->vtx.attrtype[src];
 238          arrays[attr].Integer =
 239                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 240          arrays[attr].Format = GL_RGBA;
 241          arrays[attr].Enabled = 1;
 242          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 243          _mesa_reference_buffer_object(ctx,
 244                                        &arrays[attr].BufferObj,
 245                                        exec->vtx.bufferobj);
 246
 247          varying_inputs |= VERT_BIT(attr);
 248       }
 249    }
 250
 251    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 252    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 253 }
 254
 255
 256 /**
 257  * Unmap the VBO.  This is called before drawing.
 258  */
 259 static void
 260 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 261 {
 262    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 263       struct gl_context *ctx = exec->ctx;
 264
 265       if (ctx->Driver.FlushMappedBufferRange) {
 266          GLintptr offset = exec->vtx.buffer_used -
 267                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 268          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 269                              sizeof(float);
 270
 271          if (length)
 272             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 273                                                exec->vtx.bufferobj,
 274                                                MAP_INTERNAL);
 275       }
 276
 277       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 278                                 exec->vtx.buffer_map) * sizeof(float);
 279
 280       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 281       assert(exec->vtx.buffer_ptr != NULL);
 282
 283       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 284       exec->vtx.buffer_map = NULL;
 285       exec->vtx.buffer_ptr = NULL;
 286       exec->vtx.max_vert = 0;
 287    }
 288 }
 289
 290
 291 /**
 292  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 293  */
 294 void
 295 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 296 {
 297    struct gl_context *ctx = exec->ctx;
 298    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 299                               GL_MAP_INVALIDATE_RANGE_BIT |
 300                               GL_MAP_UNSYNCHRONIZED_BIT |
 301                               GL_MAP_FLUSH_EXPLICIT_BIT |
 302                               MESA_MAP_NOWAIT_BIT;
 303    const GLenum usage = GL_STREAM_DRAW_ARB;
 304
 305    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 306       return;
 307
 308    assert(!exec->vtx.buffer_map);
 309    assert(!exec->vtx.buffer_ptr);
 310
 311    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 312       /* The VBO exists and there's room for more */
 313       if (exec->vtx.bufferobj->Size > 0) {
 314          exec->vtx.buffer_map =
 315             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 316                                                   exec->vtx.buffer_used,
 317                                                   (VBO_VERT_BUFFER_SIZE -
 318                                                    exec->vtx.buffer_used),
 319                                                   accessRange,
 320                                                   exec->vtx.bufferobj,
 321                                                   MAP_INTERNAL);
 322          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 323       }
 324       else {
 325          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 326       }
 327    }
 328
 329    if (!exec->vtx.buffer_map) {
 330       /* Need to allocate a new VBO */
 331       exec->vtx.buffer_used = 0;
 332
 333       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 334                                  VBO_VERT_BUFFER_SIZE,
 335                                  NULL, usage,
 336                                  GL_MAP_WRITE_BIT |
 337                                  GL_DYNAMIC_STORAGE_BIT |
 338                                  GL_CLIENT_STORAGE_BIT,
 339                                  exec->vtx.bufferobj)) {
 340          /* buffer allocation worked, now map the buffer */
 341          exec->vtx.buffer_map =
 342             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 343                                                   0, VBO_VERT_BUFFER_SIZE,
 344                                                   accessRange,
 345                                                   exec->vtx.bufferobj,
 346                                                   MAP_INTERNAL);
 347       }
 348       else {
 349          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 350          exec->vtx.buffer_map = NULL;
 351       }
 352    }
 353
 354    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 355
 356    if (!exec->vtx.buffer_map) {
 357       /* out of memory */
 358       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 359    }
 360    else {
 361       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 362          /* The no-op functions are installed so switch back to regular
 363           * functions.  We do this test just to avoid frequent and needless
 364           * calls to _mesa_install_exec_vtxfmt().
 365           */
 366          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 367       }
 368    }
 369
 370    if (0)
 371       printf("map %d..\n", exec->vtx.buffer_used);
 372 }
 373
 374
 375
 376 /**
 377  * Execute the buffer and save copied verts.
 378  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 379  */
 380 void
 381 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 382 {
 383    if (0)
 384       vbo_exec_debug_verts( exec );
 385
 386    if (exec->vtx.prim_count &&
 387        exec->vtx.vert_count) {
 388
 389       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 390
 391       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 392          struct gl_context *ctx = exec->ctx;
 393
 394          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 395           * from _mesa_set_varying_vp_inputs().
 396           */
 397          vbo_exec_bind_arrays( ctx );
 398
 399          if (ctx->NewState)
 400             _mesa_update_state( ctx );
 401
 402          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 403             vbo_exec_vtx_unmap( exec );
 404          }
 405
 406          if (0)
 407             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 408                    exec->vtx.vert_count);
 409
 410          vbo_context(ctx)->draw_prims( ctx,
 411                                        exec->vtx.prim,
 412                                        exec->vtx.prim_count,
 413                                        NULL,
 414                                        GL_TRUE,
 415                                        0,
 416                                        exec->vtx.vert_count - 1,
 417                                        NULL, 0, NULL);
 418
 419          /* If using a real VBO, get new storage -- unless asked not to.
 420           */
 421          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 422             vbo_exec_vtx_map( exec );
 423          }
 424       }
 425    }
 426
 427    /* May have to unmap explicitly if we didn't draw:
 428     */
 429    if (keepUnmapped &&
 430        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 431        exec->vtx.buffer_map) {
 432       vbo_exec_vtx_unmap( exec );
 433    }
 434
 435    if (keepUnmapped || exec->vtx.vertex_size == 0)
 436       exec->vtx.max_vert = 0;
 437    else
 438       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 439                             (exec->vtx.vertex_size * sizeof(GLfloat)));
 440
 441    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 442    exec->vtx.prim_count = 0;
 443    exec->vtx.vert_count = 0;
 444 }