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 <stdbool.h>
  29 #include <stdio.h>
  30 #include "main/arrayobj.h"
  31 #include "main/glheader.h"
  32 #include "main/bufferobj.h"
  33 #include "main/context.h"
  34 #include "main/enums.h"
  35 #include "main/state.h"
  36 #include "main/varray.h"
  37 #include "main/vtxfmt.h"
  38
  39 #include "vbo_noop.h"
  40 #include "vbo_private.h"
  41
  42
  43 static void
  44 vbo_exec_debug_verts(struct vbo_exec_context *exec)
  45 {
  46    GLuint count = exec->vtx.vert_count;
  47    GLuint i;
  48
  49    printf("%s: %u vertices %d primitives, %d vertsize\n",
  50           __func__,
  51           count,
  52           exec->vtx.prim_count,
  53           exec->vtx.vertex_size);
  54
  55    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  56       struct _mesa_prim *prim = &exec->vtx.prim[i];
  57       printf("   prim %d: %s %d..%d %s %s\n",
  58              i,
  59              _mesa_lookup_prim_by_nr(prim->mode),
  60              prim->start,
  61              prim->start + prim->count,
  62              prim->begin ? "BEGIN" : "(wrap)",
  63              prim->end ? "END" : "(wrap)");
  64    }
  65 }
  66
  67
  68 /**
  69  * Copy zero, one or two vertices from the current vertex buffer into
  70  * the temporary "copy" buffer.
  71  * This is used when a single primitive overflows a vertex buffer and
  72  * we need to continue the primitive in a new vertex buffer.
  73  * The temporary "copy" buffer holds the vertices which need to get
  74  * copied from the old buffer to the new one.
  75  */
  76 static GLuint
  77 vbo_copy_vertices(struct vbo_exec_context *exec)
  78 {
  79    struct _mesa_prim *last_prim = &exec->vtx.prim[exec->vtx.prim_count - 1];
  80    const GLuint nr = last_prim->count;
  81    GLuint ovf, i;
  82    const GLuint sz = exec->vtx.vertex_size;
  83    fi_type *dst = exec->vtx.copied.buffer;
  84    const fi_type *src = exec->vtx.buffer_map + last_prim->start * sz;
  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       if (last_prim->begin == 0) {
 114          /* We're dealing with the second or later section of a split/wrapped
 115           * GL_LINE_LOOP.  Since we're converting line loops to line strips,
 116           * we've already increment the last_prim->start counter by one to
 117           * skip the 0th vertex in the loop.  We need to undo that (effectively
 118           * subtract one from last_prim->start) so that we copy the 0th vertex
 119           * to the next vertex buffer.
 120           */
 121          assert(last_prim->start > 0);
 122          src -= sz;
 123       }
 124       /* fall-through */
 125    case GL_TRIANGLE_FAN:
 126    case GL_POLYGON:
 127       if (nr == 0) {
 128          return 0;
 129       }
 130       else if (nr == 1) {
 131          memcpy(dst, src+0, sz * sizeof(GLfloat));
 132          return 1;
 133       }
 134       else {
 135          memcpy(dst, src+0, sz * sizeof(GLfloat));
 136          memcpy(dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat));
 137          return 2;
 138       }
 139    case GL_TRIANGLE_STRIP:
 140       /* no parity issue, but need to make sure the tri is not drawn twice */
 141       if (nr & 1) {
 142          last_prim->count--;
 143       }
 144       /* fallthrough */
 145    case GL_QUAD_STRIP:
 146       switch (nr) {
 147       case 0:
 148          ovf = 0;
 149          break;
 150       case 1:
 151          ovf = 1;
 152          break;
 153       default:
 154          ovf = 2 + (nr & 1);
 155          break;
 156       }
 157       for (i = 0 ; i < ovf ; i++)
 158          memcpy(dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat));
 159       return i;
 160    case PRIM_OUTSIDE_BEGIN_END:
 161       return 0;
 162    default:
 163       unreachable("Unexpected primitive type");
 164       return 0;
 165    }
 166 }
 167
 168
 169
 170 /* TODO: populate these as the vertex is defined:
 171  */
 172 static void
 173 vbo_exec_bind_arrays(struct gl_context *ctx)
 174 {
 175    struct vbo_context *vbo = vbo_context(ctx);
 176    struct gl_vertex_array_object *vao = vbo->VAO;
 177    struct vbo_exec_context *exec = &vbo->exec;
 178
 179    GLintptr buffer_offset;
 180    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 181       assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 182       buffer_offset = exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset +
 183                       exec->vtx.buffer_offset;
 184    } else {
 185       /* Ptr into ordinary app memory */
 186       buffer_offset = (GLbyte *)exec->vtx.buffer_map - (GLbyte *)NULL;
 187    }
 188
 189    const gl_vertex_processing_mode mode = ctx->VertexProgram._VPMode;
 190
 191    /* Compute the bitmasks of vao_enabled arrays */
 192    GLbitfield vao_enabled = _vbo_get_vao_enabled_from_vbo(mode, exec->vtx.enabled);
 193
 194    /* At first disable arrays no longer needed */
 195    _mesa_disable_vertex_array_attribs(ctx, vao, VERT_BIT_ALL & ~vao_enabled);
 196    assert((~vao_enabled & vao->Enabled) == 0);
 197
 198    /* Bind the buffer object */
 199    const GLuint stride = exec->vtx.vertex_size*sizeof(GLfloat);
 200    _mesa_bind_vertex_buffer(ctx, vao, 0, exec->vtx.bufferobj, buffer_offset,
 201                             stride);
 202
 203    /* Retrieve the mapping from VBO_ATTRIB to VERT_ATTRIB space
 204     * Note that the position/generic0 aliasing is done in the VAO.
 205     */
 206    const GLubyte *const vao_to_vbo_map = _vbo_attribute_alias_map[mode];
 207    /* Now set the enabled arrays */
 208    GLbitfield mask = vao_enabled;
 209    while (mask) {
 210       const int vao_attr = u_bit_scan(&mask);
 211       const GLubyte vbo_attr = vao_to_vbo_map[vao_attr];
 212
 213       const GLubyte size = exec->vtx.attrsz[vbo_attr];
 214       const GLenum16 type = exec->vtx.attrtype[vbo_attr];
 215       const GLuint offset = (GLuint)((GLbyte *)exec->vtx.attrptr[vbo_attr] -
 216                                      (GLbyte *)exec->vtx.vertex);
 217       assert(offset <= ctx->Const.MaxVertexAttribRelativeOffset);
 218
 219       /* Set and enable */
 220       _vbo_set_attrib_format(ctx, vao, vao_attr, buffer_offset,
 221                              size, type, offset);
 222
 223       /* The vao is initially created with all bindings set to 0. */
 224       assert(vao->VertexAttrib[vao_attr].BufferBindingIndex == 0);
 225    }
 226    _mesa_enable_vertex_array_attribs(ctx, vao, vao_enabled);
 227    assert(vao_enabled == vao->Enabled);
 228    assert(!_mesa_is_bufferobj(exec->vtx.bufferobj) ||
 229           (vao_enabled & ~vao->VertexAttribBufferMask) == 0);
 230
 231    _mesa_set_draw_vao(ctx, vao, _vbo_get_vao_filter(mode));
 232 }
 233
 234
 235 /**
 236  * Unmap the VBO.  This is called before drawing.
 237  */
 238 static void
 239 vbo_exec_vtx_unmap(struct vbo_exec_context *exec)
 240 {
 241    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 242       struct gl_context *ctx = exec->ctx;
 243
 244       if (ctx->Driver.FlushMappedBufferRange &&
 245           !ctx->Extensions.ARB_buffer_storage) {
 246          GLintptr offset = exec->vtx.buffer_used -
 247                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 248          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 249                              sizeof(float);
 250
 251          if (length)
 252             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 253                                                exec->vtx.bufferobj,
 254                                                MAP_INTERNAL);
 255       }
 256
 257       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 258                                 exec->vtx.buffer_map) * sizeof(float);
 259
 260       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 261       assert(exec->vtx.buffer_ptr != NULL);
 262
 263       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 264       exec->vtx.buffer_map = NULL;
 265       exec->vtx.buffer_ptr = NULL;
 266       exec->vtx.max_vert = 0;
 267    }
 268 }
 269
 270 static bool
 271 vbo_exec_buffer_has_space(struct vbo_exec_context *exec)
 272 {
 273    return VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024;
 274 }
 275
 276
 277 /**
 278  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 279  */
 280 void
 281 vbo_exec_vtx_map(struct vbo_exec_context *exec)
 282 {
 283    struct gl_context *ctx = exec->ctx;
 284    const GLenum usage = GL_STREAM_DRAW_ARB;
 285    GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 286                         GL_MAP_UNSYNCHRONIZED_BIT;
 287
 288    if (ctx->Extensions.ARB_buffer_storage) {
 289       accessRange |= GL_MAP_PERSISTENT_BIT |
 290                      GL_MAP_COHERENT_BIT;
 291    } else {
 292       accessRange |= GL_MAP_INVALIDATE_RANGE_BIT |
 293                      GL_MAP_FLUSH_EXPLICIT_BIT |
 294                      MESA_MAP_NOWAIT_BIT;
 295    }
 296
 297    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 298       return;
 299
 300    assert(!exec->vtx.buffer_map);
 301    assert(!exec->vtx.buffer_ptr);
 302
 303    if (vbo_exec_buffer_has_space(exec)) {
 304       /* The VBO exists and there's room for more */
 305       if (exec->vtx.bufferobj->Size > 0) {
 306          exec->vtx.buffer_map = (fi_type *)
 307             ctx->Driver.MapBufferRange(ctx,
 308                                        exec->vtx.buffer_used,
 309                                        VBO_VERT_BUFFER_SIZE
 310                                        - exec->vtx.buffer_used,
 311                                        accessRange,
 312                                        exec->vtx.bufferobj,
 313                                        MAP_INTERNAL);
 314          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 315       }
 316       else {
 317          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 318       }
 319    }
 320
 321    if (!exec->vtx.buffer_map) {
 322       /* Need to allocate a new VBO */
 323       exec->vtx.buffer_used = 0;
 324
 325       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 326                                  VBO_VERT_BUFFER_SIZE,
 327                                  NULL, usage,
 328                                  GL_MAP_WRITE_BIT |
 329                                  (ctx->Extensions.ARB_buffer_storage ?
 330                                     GL_MAP_PERSISTENT_BIT |
 331                                     GL_MAP_COHERENT_BIT : 0) |
 332                                  GL_DYNAMIC_STORAGE_BIT |
 333                                  GL_CLIENT_STORAGE_BIT,
 334                                  exec->vtx.bufferobj)) {
 335          /* buffer allocation worked, now map the buffer */
 336          exec->vtx.buffer_map =
 337             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 338                                                   0, VBO_VERT_BUFFER_SIZE,
 339                                                   accessRange,
 340                                                   exec->vtx.bufferobj,
 341                                                   MAP_INTERNAL);
 342       }
 343       else {
 344          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 345          exec->vtx.buffer_map = NULL;
 346       }
 347    }
 348
 349    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 350    exec->vtx.buffer_offset = 0;
 351
 352    if (!exec->vtx.buffer_map) {
 353       /* out of memory */
 354       _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt_noop);
 355    }
 356    else {
 357       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 358          /* The no-op functions are installed so switch back to regular
 359           * functions.  We do this test just to avoid frequent and needless
 360           * calls to _mesa_install_exec_vtxfmt().
 361           */
 362          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 363       }
 364    }
 365
 366    if (0)
 367       printf("map %d..\n", exec->vtx.buffer_used);
 368 }
 369
 370
 371
 372 /**
 373  * Execute the buffer and save copied verts.
 374  * \param unmap  if true, leave the VBO unmapped when we're done.
 375  */
 376 void
 377 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean unmap)
 378 {
 379    /* Only unmap if persistent mappings are unsupported. */
 380    bool persistent_mapping = exec->ctx->Extensions.ARB_buffer_storage &&
 381                              _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 382                              exec->vtx.buffer_map;
 383    unmap = unmap && !persistent_mapping;
 384
 385    if (0)
 386       vbo_exec_debug_verts(exec);
 387
 388    if (exec->vtx.prim_count &&
 389        exec->vtx.vert_count) {
 390
 391       exec->vtx.copied.nr = vbo_copy_vertices(exec);
 392
 393       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 394          struct gl_context *ctx = exec->ctx;
 395
 396          /* Prepare and set the exec draws internal VAO for drawing. */
 397          vbo_exec_bind_arrays(ctx);
 398
 399          if (ctx->NewState)
 400             _mesa_update_state(ctx);
 401
 402          if (!persistent_mapping)
 403             vbo_exec_vtx_unmap(exec);
 404
 405          assert(ctx->NewState == 0);
 406
 407          if (0)
 408             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 409                    exec->vtx.vert_count);
 410
 411          ctx->Driver.Draw(ctx, exec->vtx.prim, exec->vtx.prim_count,
 412                           NULL, GL_TRUE, 0, exec->vtx.vert_count - 1,
 413                           NULL, 0, NULL);
 414
 415          /* Get new storage -- unless asked not to. */
 416          if (!persistent_mapping && !unmap)
 417             vbo_exec_vtx_map(exec);
 418       }
 419    }
 420
 421    /* May have to unmap explicitly if we didn't draw:
 422     */
 423    if (unmap && exec->vtx.buffer_map) {
 424       vbo_exec_vtx_unmap(exec);
 425    }
 426
 427    if (persistent_mapping) {
 428       exec->vtx.buffer_used += (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 429                                sizeof(float);
 430       exec->vtx.buffer_map = exec->vtx.buffer_ptr;
 431
 432       /* Set the buffer offset for the next draw. */
 433       exec->vtx.buffer_offset = exec->vtx.buffer_used;
 434
 435       if (!vbo_exec_buffer_has_space(exec)) {
 436          /* This will allocate a new buffer. */
 437          vbo_exec_vtx_unmap(exec);
 438          vbo_exec_vtx_map(exec);
 439       }
 440    }
 441
 442    if (unmap || exec->vtx.vertex_size == 0)
 443       exec->vtx.max_vert = 0;
 444    else
 445       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 446
 447    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 448    exec->vtx.prim_count = 0;
 449    exec->vtx.vert_count = 0;
 450 }