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/glheader.h"
  31 #include "main/bufferobj.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_noop.h"
  38 #include "vbo_private.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       unreachable("Unexpected primitive type");
 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_vertex_array *arrays = exec->vtx.arrays;
 177    const GLubyte *map;
 178    GLuint attr;
 179    GLbitfield varying_inputs = 0x0;
 180    bool swap_pos = false;
 181
 182    /* Install the default (ie Current) attributes first */
 183    for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 184       exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 185    }
 186
 187    /* Overlay other active attributes */
 188    switch (get_program_mode(exec->ctx)) {
 189    case VP_NONE:
 190       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 191          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 192          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 193             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 194       }
 195       map = vbo->map_vp_none;
 196       break;
 197    case VP_ARB:
 198       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 199          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 200          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 201             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 202       }
 203       map = vbo->map_vp_arb;
 204
 205       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 206        * In that case we effectively need to route the data from
 207        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 208        * The original state gets essentially restored below.
 209        */
 210       const GLbitfield64 inputs_read =
 211          ctx->VertexProgram._Current->info.inputs_read;
 212       if ((inputs_read & VERT_BIT_POS) == 0 &&
 213           (inputs_read & VERT_BIT_GENERIC0)) {
 214          swap_pos = true;
 215          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 216          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 217          exec->vtx.attrtype[VERT_ATTRIB_GENERIC0] = exec->vtx.attrtype[0];
 218          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 219          exec->vtx.attrsz[0] = 0;
 220       }
 221       break;
 222    default:
 223       unreachable("Bad vertex program mode");
 224    }
 225
 226    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 227       const GLuint src = map[attr];
 228
 229       if (exec->vtx.attrsz[src]) {
 230          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 231             (GLbyte *)exec->vtx.vertex;
 232
 233          /* override the default array set above */
 234          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 235          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 236          exec->vtx.inputs[attr] = &arrays[attr];
 237
 238          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 239             /* a real buffer obj: Ptr is an offset, not a pointer */
 240             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 241             assert(offset >= 0);
 242             arrays[attr].Ptr = (GLubyte *)
 243                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 244          }
 245          else {
 246             /* Ptr into ordinary app memory */
 247             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 248          }
 249          arrays[attr].Size = exec->vtx.attrsz[src];
 250          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 251          arrays[attr].Type = exec->vtx.attrtype[src];
 252          arrays[attr].Integer =
 253                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 254          arrays[attr].Format = GL_RGBA;
 255          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 256          _mesa_reference_buffer_object(ctx,
 257                                        &arrays[attr].BufferObj,
 258                                        exec->vtx.bufferobj);
 259
 260          varying_inputs |= VERT_BIT(attr);
 261       }
 262    }
 263
 264    /* In case we swapped the position and generic0 attribute.
 265     * Restore the original setting of the vtx.* variables.
 266     * They are still needed with the original order and settings in case
 267     * of a split primitive.
 268     */
 269    if (swap_pos) {
 270       exec->vtx.attrsz[0] = exec->vtx.attrsz[VERT_ATTRIB_GENERIC0];
 271       exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = 0;
 272    }
 273
 274    _mesa_set_varying_vp_inputs(ctx, varying_inputs);
 275    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 276 }
 277
 278
 279 /**
 280  * Unmap the VBO.  This is called before drawing.
 281  */
 282 static void
 283 vbo_exec_vtx_unmap(struct vbo_exec_context *exec)
 284 {
 285    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 286       struct gl_context *ctx = exec->ctx;
 287
 288       if (ctx->Driver.FlushMappedBufferRange) {
 289          GLintptr offset = exec->vtx.buffer_used -
 290                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 291          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 292                              sizeof(float);
 293
 294          if (length)
 295             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 296                                                exec->vtx.bufferobj,
 297                                                MAP_INTERNAL);
 298       }
 299
 300       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 301                                 exec->vtx.buffer_map) * sizeof(float);
 302
 303       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 304       assert(exec->vtx.buffer_ptr != NULL);
 305
 306       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 307       exec->vtx.buffer_map = NULL;
 308       exec->vtx.buffer_ptr = NULL;
 309       exec->vtx.max_vert = 0;
 310    }
 311 }
 312
 313
 314 /**
 315  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 316  */
 317 void
 318 vbo_exec_vtx_map(struct vbo_exec_context *exec)
 319 {
 320    struct gl_context *ctx = exec->ctx;
 321    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 322                               GL_MAP_INVALIDATE_RANGE_BIT |
 323                               GL_MAP_UNSYNCHRONIZED_BIT |
 324                               GL_MAP_FLUSH_EXPLICIT_BIT |
 325                               MESA_MAP_NOWAIT_BIT;
 326    const GLenum usage = GL_STREAM_DRAW_ARB;
 327
 328    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 329       return;
 330
 331    assert(!exec->vtx.buffer_map);
 332    assert(!exec->vtx.buffer_ptr);
 333
 334    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 335       /* The VBO exists and there's room for more */
 336       if (exec->vtx.bufferobj->Size > 0) {
 337          exec->vtx.buffer_map = (fi_type *)
 338             ctx->Driver.MapBufferRange(ctx,
 339                                        exec->vtx.buffer_used,
 340                                        VBO_VERT_BUFFER_SIZE
 341                                        - exec->vtx.buffer_used,
 342                                        accessRange,
 343                                        exec->vtx.bufferobj,
 344                                        MAP_INTERNAL);
 345          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 346       }
 347       else {
 348          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 349       }
 350    }
 351
 352    if (!exec->vtx.buffer_map) {
 353       /* Need to allocate a new VBO */
 354       exec->vtx.buffer_used = 0;
 355
 356       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 357                                  VBO_VERT_BUFFER_SIZE,
 358                                  NULL, usage,
 359                                  GL_MAP_WRITE_BIT |
 360                                  GL_DYNAMIC_STORAGE_BIT |
 361                                  GL_CLIENT_STORAGE_BIT,
 362                                  exec->vtx.bufferobj)) {
 363          /* buffer allocation worked, now map the buffer */
 364          exec->vtx.buffer_map =
 365             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 366                                                   0, VBO_VERT_BUFFER_SIZE,
 367                                                   accessRange,
 368                                                   exec->vtx.bufferobj,
 369                                                   MAP_INTERNAL);
 370       }
 371       else {
 372          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 373          exec->vtx.buffer_map = NULL;
 374       }
 375    }
 376
 377    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 378
 379    if (!exec->vtx.buffer_map) {
 380       /* out of memory */
 381       _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt_noop);
 382    }
 383    else {
 384       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 385          /* The no-op functions are installed so switch back to regular
 386           * functions.  We do this test just to avoid frequent and needless
 387           * calls to _mesa_install_exec_vtxfmt().
 388           */
 389          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 390       }
 391    }
 392
 393    if (0)
 394       printf("map %d..\n", exec->vtx.buffer_used);
 395 }
 396
 397
 398
 399 /**
 400  * Execute the buffer and save copied verts.
 401  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 402  */
 403 void
 404 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 405 {
 406    if (0)
 407       vbo_exec_debug_verts(exec);
 408
 409    if (exec->vtx.prim_count &&
 410        exec->vtx.vert_count) {
 411
 412       exec->vtx.copied.nr = vbo_copy_vertices(exec);
 413
 414       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 415          struct gl_context *ctx = exec->ctx;
 416
 417          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 418           * from _mesa_set_varying_vp_inputs().
 419           */
 420          vbo_exec_bind_arrays(ctx);
 421
 422          if (ctx->NewState)
 423             _mesa_update_state(ctx);
 424
 425          vbo_exec_vtx_unmap(exec);
 426
 427          if (0)
 428             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 429                    exec->vtx.vert_count);
 430
 431          vbo_context(ctx)->draw_prims(ctx,
 432                                       exec->vtx.prim,
 433                                       exec->vtx.prim_count,
 434                                       NULL,
 435                                       GL_TRUE,
 436                                       0,
 437                                       exec->vtx.vert_count - 1,
 438                                       NULL, 0, NULL);
 439
 440          /* Get new storage -- unless asked not to. */
 441          if (!keepUnmapped)
 442             vbo_exec_vtx_map(exec);
 443       }
 444    }
 445
 446    /* May have to unmap explicitly if we didn't draw:
 447     */
 448    if (keepUnmapped && exec->vtx.buffer_map) {
 449       vbo_exec_vtx_unmap(exec);
 450    }
 451
 452    if (keepUnmapped || exec->vtx.vertex_size == 0)
 453       exec->vtx.max_vert = 0;
 454    else
 455       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 456
 457    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 458    exec->vtx.prim_count = 0;
 459    exec->vtx.vert_count = 0;
 460 }