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/compiler.h"
  33 #include "main/context.h"
  34 #include "main/enums.h"
  35 #include "main/state.h"
  36 #include "main/vtxfmt.h"
  37
  38 #include "vbo_context.h"
  39 #include "vbo_noop.h"
  40
  41
  42 static void
  43 vbo_exec_debug_verts( struct vbo_exec_context *exec )
  44 {
  45    GLuint count = exec->vtx.vert_count;
  46    GLuint i;
  47
  48    printf("%s: %u vertices %d primitives, %d vertsize\n",
  49           __func__,
  50           count,
  51           exec->vtx.prim_count,
  52           exec->vtx.vertex_size);
  53
  54    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  55       struct _mesa_prim *prim = &exec->vtx.prim[i];
  56       printf("   prim %d: %s%s %d..%d %s %s\n",
  57              i,
  58              _mesa_lookup_prim_by_nr(prim->mode),
  59              prim->weak ? " (weak)" : "",
  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       assert(0);
 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 vbo_exec_context *exec = &vbo->exec;
 177    struct gl_vertex_array *arrays = exec->vtx.arrays;
 178    const GLubyte *map;
 179    GLuint attr;
 180    GLbitfield varying_inputs = 0x0;
 181    bool swap_pos = false;
 182
 183    /* Install the default (ie Current) attributes first */
 184    for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 185       exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 186    }
 187
 188    /* Overlay other active attributes */
 189    switch (get_program_mode(exec->ctx)) {
 190    case VP_NONE:
 191       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 192          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 193          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 194             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 195       }
 196       map = vbo->map_vp_none;
 197       break;
 198    case VP_ARB:
 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        * The original state gets essentially restored below.
 210        */
 211       const GLbitfield64 inputs_read =
 212          ctx->VertexProgram._Current->info.inputs_read;
 213       if ((inputs_read & VERT_BIT_POS) == 0 &&
 214           (inputs_read & VERT_BIT_GENERIC0)) {
 215          swap_pos = true;
 216          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 217          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 218          exec->vtx.attrtype[VERT_ATTRIB_GENERIC0] = exec->vtx.attrtype[0];
 219          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 220          exec->vtx.attrsz[0] = 0;
 221       }
 222       break;
 223    default:
 224       assert(0);
 225    }
 226
 227    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 228       const GLuint src = map[attr];
 229
 230       if (exec->vtx.attrsz[src]) {
 231          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 232             (GLbyte *)exec->vtx.vertex;
 233
 234          /* override the default array set above */
 235          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 236          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 237          exec->vtx.inputs[attr] = &arrays[attr];
 238
 239          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 240             /* a real buffer obj: Ptr is an offset, not a pointer */
 241             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 242             assert(offset >= 0);
 243             arrays[attr].Ptr = (GLubyte *)
 244                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 245          }
 246          else {
 247             /* Ptr into ordinary app memory */
 248             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 249          }
 250          arrays[attr].Size = exec->vtx.attrsz[src];
 251          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 252          arrays[attr].Type = exec->vtx.attrtype[src];
 253          arrays[attr].Integer =
 254                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 255          arrays[attr].Format = GL_RGBA;
 256          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 257          _mesa_reference_buffer_object(ctx,
 258                                        &arrays[attr].BufferObj,
 259                                        exec->vtx.bufferobj);
 260
 261          varying_inputs |= VERT_BIT(attr);
 262       }
 263    }
 264
 265    /* In case we swapped the position and generic0 attribute.
 266     * Restore the original setting of the vtx.* variables.
 267     * They are still needed with the original order and settings in case
 268     * of a split primitive.
 269     */
 270    if (swap_pos) {
 271       exec->vtx.attrsz[0] = exec->vtx.attrsz[VERT_ATTRIB_GENERIC0];
 272       exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = 0;
 273    }
 274
 275    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 276    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 277 }
 278
 279
 280 /**
 281  * Unmap the VBO.  This is called before drawing.
 282  */
 283 static void
 284 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 285 {
 286    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 287       struct gl_context *ctx = exec->ctx;
 288
 289       if (ctx->Driver.FlushMappedBufferRange) {
 290          GLintptr offset = exec->vtx.buffer_used -
 291                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 292          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 293                              sizeof(float);
 294
 295          if (length)
 296             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 297                                                exec->vtx.bufferobj,
 298                                                MAP_INTERNAL);
 299       }
 300
 301       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 302                                 exec->vtx.buffer_map) * sizeof(float);
 303
 304       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 305       assert(exec->vtx.buffer_ptr != NULL);
 306
 307       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 308       exec->vtx.buffer_map = NULL;
 309       exec->vtx.buffer_ptr = NULL;
 310       exec->vtx.max_vert = 0;
 311    }
 312 }
 313
 314
 315 /**
 316  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 317  */
 318 void
 319 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 320 {
 321    struct gl_context *ctx = exec->ctx;
 322    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 323                               GL_MAP_INVALIDATE_RANGE_BIT |
 324                               GL_MAP_UNSYNCHRONIZED_BIT |
 325                               GL_MAP_FLUSH_EXPLICIT_BIT |
 326                               MESA_MAP_NOWAIT_BIT;
 327    const GLenum usage = GL_STREAM_DRAW_ARB;
 328
 329    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 330       return;
 331
 332    assert(!exec->vtx.buffer_map);
 333    assert(!exec->vtx.buffer_ptr);
 334
 335    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 336       /* The VBO exists and there's room for more */
 337       if (exec->vtx.bufferobj->Size > 0) {
 338          exec->vtx.buffer_map =
 339             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 340                                                   exec->vtx.buffer_used,
 341                                                   (VBO_VERT_BUFFER_SIZE -
 342                                                    exec->vtx.buffer_used),
 343                                                   accessRange,
 344                                                   exec->vtx.bufferobj,
 345                                                   MAP_INTERNAL);
 346          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 347       }
 348       else {
 349          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 350       }
 351    }
 352
 353    if (!exec->vtx.buffer_map) {
 354       /* Need to allocate a new VBO */
 355       exec->vtx.buffer_used = 0;
 356
 357       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 358                                  VBO_VERT_BUFFER_SIZE,
 359                                  NULL, usage,
 360                                  GL_MAP_WRITE_BIT |
 361                                  GL_DYNAMIC_STORAGE_BIT |
 362                                  GL_CLIENT_STORAGE_BIT,
 363                                  exec->vtx.bufferobj)) {
 364          /* buffer allocation worked, now map the buffer */
 365          exec->vtx.buffer_map =
 366             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 367                                                   0, VBO_VERT_BUFFER_SIZE,
 368                                                   accessRange,
 369                                                   exec->vtx.bufferobj,
 370                                                   MAP_INTERNAL);
 371       }
 372       else {
 373          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 374          exec->vtx.buffer_map = NULL;
 375       }
 376    }
 377
 378    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 379
 380    if (!exec->vtx.buffer_map) {
 381       /* out of memory */
 382       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 383    }
 384    else {
 385       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 386          /* The no-op functions are installed so switch back to regular
 387           * functions.  We do this test just to avoid frequent and needless
 388           * calls to _mesa_install_exec_vtxfmt().
 389           */
 390          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 391       }
 392    }
 393
 394    if (0)
 395       printf("map %d..\n", exec->vtx.buffer_used);
 396 }
 397
 398
 399
 400 /**
 401  * Execute the buffer and save copied verts.
 402  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 403  */
 404 void
 405 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 406 {
 407    if (0)
 408       vbo_exec_debug_verts( exec );
 409
 410    if (exec->vtx.prim_count &&
 411        exec->vtx.vert_count) {
 412
 413       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 414
 415       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 416          struct gl_context *ctx = exec->ctx;
 417
 418          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 419           * from _mesa_set_varying_vp_inputs().
 420           */
 421          vbo_exec_bind_arrays( ctx );
 422
 423          if (ctx->NewState)
 424             _mesa_update_state( ctx );
 425
 426          vbo_exec_vtx_unmap(exec);
 427
 428          if (0)
 429             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 430                    exec->vtx.vert_count);
 431
 432          vbo_context(ctx)->draw_prims( ctx,
 433                                        exec->vtx.prim,
 434                                        exec->vtx.prim_count,
 435                                        NULL,
 436                                        GL_TRUE,
 437                                        0,
 438                                        exec->vtx.vert_count - 1,
 439                                        NULL, 0, NULL);
 440
 441          /* Get new storage -- unless asked not to. */
 442          if (!keepUnmapped)
 443             vbo_exec_vtx_map( exec );
 444       }
 445    }
 446
 447    /* May have to unmap explicitly if we didn't draw:
 448     */
 449    if (keepUnmapped && exec->vtx.buffer_map) {
 450       vbo_exec_vtx_unmap( exec );
 451    }
 452
 453    if (keepUnmapped || exec->vtx.vertex_size == 0)
 454       exec->vtx.max_vert = 0;
 455    else
 456       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 457
 458    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 459    exec->vtx.prim_count = 0;
 460    exec->vtx.vert_count = 0;
 461 }