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  * NOTE: Need to have calculated primitives by this point -- do it on the fly.
  69  * NOTE: Old 'parity' issue is gone.
  70  */
  71 static GLuint
  72 vbo_copy_vertices( struct vbo_exec_context *exec )
  73 {
  74    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
  75    GLuint ovf, i;
  76    GLuint sz = exec->vtx.vertex_size;
  77    fi_type *dst = exec->vtx.copied.buffer;
  78    const fi_type *src = (exec->vtx.buffer_map +
  79                          exec->vtx.prim[exec->vtx.prim_count-1].start *
  80                          exec->vtx.vertex_size);
  81
  82    switch (exec->ctx->Driver.CurrentExecPrimitive) {
  83    case GL_POINTS:
  84       return 0;
  85    case GL_LINES:
  86       ovf = nr&1;
  87       for (i = 0 ; i < ovf ; i++)
  88          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  89       return i;
  90    case GL_TRIANGLES:
  91       ovf = nr%3;
  92       for (i = 0 ; i < ovf ; i++)
  93          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  94       return i;
  95    case GL_QUADS:
  96       ovf = nr&3;
  97       for (i = 0 ; i < ovf ; i++)
  98          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  99       return i;
 100    case GL_LINE_STRIP:
 101       if (nr == 0) {
 102          return 0;
 103       }
 104       else {
 105          memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 106          return 1;
 107       }
 108    case GL_LINE_LOOP:
 109    case GL_TRIANGLE_FAN:
 110    case GL_POLYGON:
 111       if (nr == 0) {
 112          return 0;
 113       }
 114       else if (nr == 1) {
 115          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 116          return 1;
 117       }
 118       else {
 119          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 120          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 121          return 2;
 122       }
 123    case GL_TRIANGLE_STRIP:
 124       /* no parity issue, but need to make sure the tri is not drawn twice */
 125       if (nr & 1) {
 126          exec->vtx.prim[exec->vtx.prim_count-1].count--;
 127       }
 128       /* fallthrough */
 129    case GL_QUAD_STRIP:
 130       switch (nr) {
 131       case 0:
 132          ovf = 0;
 133          break;
 134       case 1:
 135          ovf = 1;
 136          break;
 137       default:
 138          ovf = 2 + (nr & 1);
 139          break;
 140       }
 141       for (i = 0 ; i < ovf ; i++)
 142          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 143       return i;
 144    case PRIM_OUTSIDE_BEGIN_END:
 145       return 0;
 146    default:
 147       assert(0);
 148       return 0;
 149    }
 150 }
 151
 152
 153
 154 /* TODO: populate these as the vertex is defined:
 155  */
 156 static void
 157 vbo_exec_bind_arrays( struct gl_context *ctx )
 158 {
 159    struct vbo_context *vbo = vbo_context(ctx);
 160    struct vbo_exec_context *exec = &vbo->exec;
 161    struct gl_client_array *arrays = exec->vtx.arrays;
 162    const GLuint *map;
 163    GLuint attr;
 164    GLbitfield64 varying_inputs = 0x0;
 165
 166    /* Install the default (ie Current) attributes first, then overlay
 167     * all active ones.
 168     */
 169    switch (get_program_mode(exec->ctx)) {
 170    case VP_NONE:
 171       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 172          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 173       }
 174       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 175          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 176          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 177             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 178       }
 179       map = vbo->map_vp_none;
 180       break;
 181    case VP_ARB:
 182       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 183          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 184       }
 185       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 186          assert(VERT_ATTRIB_GENERIC(attr) < ARRAY_SIZE(exec->vtx.inputs));
 187          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 188             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 189       }
 190       map = vbo->map_vp_arb;
 191
 192       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 193        * In that case we effectively need to route the data from
 194        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 195        */
 196       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 197           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 198          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 199          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 200          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 201          exec->vtx.attrsz[0] = 0;
 202       }
 203       break;
 204    default:
 205       assert(0);
 206    }
 207
 208    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 209       const GLuint src = map[attr];
 210
 211       if (exec->vtx.attrsz[src]) {
 212          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 213             (GLbyte *)exec->vtx.vertex;
 214
 215          /* override the default array set above */
 216          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 217          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 218          exec->vtx.inputs[attr] = &arrays[attr];
 219
 220          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 221             /* a real buffer obj: Ptr is an offset, not a pointer */
 222             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 223             assert(offset >= 0);
 224             arrays[attr].Ptr = (GLubyte *)
 225                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 226          }
 227          else {
 228             /* Ptr into ordinary app memory */
 229             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 230          }
 231          arrays[attr].Size = exec->vtx.attrsz[src];
 232          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 233          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 234          arrays[attr].Type = exec->vtx.attrtype[src];
 235          arrays[attr].Integer =
 236                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
 237          arrays[attr].Format = GL_RGBA;
 238          arrays[attr].Enabled = 1;
 239          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 240          _mesa_reference_buffer_object(ctx,
 241                                        &arrays[attr].BufferObj,
 242                                        exec->vtx.bufferobj);
 243
 244          varying_inputs |= VERT_BIT(attr);
 245       }
 246    }
 247
 248    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 249    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 250 }
 251
 252
 253 /**
 254  * Unmap the VBO.  This is called before drawing.
 255  */
 256 static void
 257 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 258 {
 259    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 260       struct gl_context *ctx = exec->ctx;
 261
 262       if (ctx->Driver.FlushMappedBufferRange) {
 263          GLintptr offset = exec->vtx.buffer_used -
 264                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 265          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 266                              sizeof(float);
 267
 268          if (length)
 269             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 270                                                exec->vtx.bufferobj,
 271                                                MAP_INTERNAL);
 272       }
 273
 274       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 275                                 exec->vtx.buffer_map) * sizeof(float);
 276
 277       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 278       assert(exec->vtx.buffer_ptr != NULL);
 279
 280       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 281       exec->vtx.buffer_map = NULL;
 282       exec->vtx.buffer_ptr = NULL;
 283       exec->vtx.max_vert = 0;
 284    }
 285 }
 286
 287
 288 /**
 289  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 290  */
 291 void
 292 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 293 {
 294    struct gl_context *ctx = exec->ctx;
 295    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 296                               GL_MAP_INVALIDATE_RANGE_BIT |
 297                               GL_MAP_UNSYNCHRONIZED_BIT |
 298                               GL_MAP_FLUSH_EXPLICIT_BIT |
 299                               MESA_MAP_NOWAIT_BIT;
 300    const GLenum usage = GL_STREAM_DRAW_ARB;
 301
 302    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 303       return;
 304
 305    assert(!exec->vtx.buffer_map);
 306    assert(!exec->vtx.buffer_ptr);
 307
 308    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 309       /* The VBO exists and there's room for more */
 310       if (exec->vtx.bufferobj->Size > 0) {
 311          exec->vtx.buffer_map =
 312             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 313                                                   exec->vtx.buffer_used,
 314                                                   (VBO_VERT_BUFFER_SIZE -
 315                                                    exec->vtx.buffer_used),
 316                                                   accessRange,
 317                                                   exec->vtx.bufferobj,
 318                                                   MAP_INTERNAL);
 319          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 320       }
 321       else {
 322          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 323       }
 324    }
 325
 326    if (!exec->vtx.buffer_map) {
 327       /* Need to allocate a new VBO */
 328       exec->vtx.buffer_used = 0;
 329
 330       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 331                                  VBO_VERT_BUFFER_SIZE,
 332                                  NULL, usage,
 333                                  GL_MAP_WRITE_BIT |
 334                                  GL_DYNAMIC_STORAGE_BIT |
 335                                  GL_CLIENT_STORAGE_BIT,
 336                                  exec->vtx.bufferobj)) {
 337          /* buffer allocation worked, now map the buffer */
 338          exec->vtx.buffer_map =
 339             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 340                                                   0, VBO_VERT_BUFFER_SIZE,
 341                                                   accessRange,
 342                                                   exec->vtx.bufferobj,
 343                                                   MAP_INTERNAL);
 344       }
 345       else {
 346          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 347          exec->vtx.buffer_map = NULL;
 348       }
 349    }
 350
 351    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 352
 353    if (!exec->vtx.buffer_map) {
 354       /* out of memory */
 355       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 356    }
 357    else {
 358       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 359          /* The no-op functions are installed so switch back to regular
 360           * functions.  We do this test just to avoid frequent and needless
 361           * calls to _mesa_install_exec_vtxfmt().
 362           */
 363          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 364       }
 365    }
 366
 367    if (0)
 368       printf("map %d..\n", exec->vtx.buffer_used);
 369 }
 370
 371
 372
 373 /**
 374  * Execute the buffer and save copied verts.
 375  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 376  */
 377 void
 378 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 379 {
 380    if (0)
 381       vbo_exec_debug_verts( exec );
 382
 383    if (exec->vtx.prim_count &&
 384        exec->vtx.vert_count) {
 385
 386       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 387
 388       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 389          struct gl_context *ctx = exec->ctx;
 390
 391          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 392           * from _mesa_set_varying_vp_inputs().
 393           */
 394          vbo_exec_bind_arrays( ctx );
 395
 396          if (ctx->NewState)
 397             _mesa_update_state( ctx );
 398
 399          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 400             vbo_exec_vtx_unmap( exec );
 401          }
 402
 403          if (0)
 404             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 405                    exec->vtx.vert_count);
 406
 407          vbo_context(ctx)->draw_prims( ctx,
 408                                        exec->vtx.prim,
 409                                        exec->vtx.prim_count,
 410                                        NULL,
 411                                        GL_TRUE,
 412                                        0,
 413                                        exec->vtx.vert_count - 1,
 414                                        NULL, 0, NULL);
 415
 416          /* If using a real VBO, get new storage -- unless asked not to.
 417           */
 418          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 419             vbo_exec_vtx_map( exec );
 420          }
 421       }
 422    }
 423
 424    /* May have to unmap explicitly if we didn't draw:
 425     */
 426    if (keepUnmapped &&
 427        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 428        exec->vtx.buffer_map) {
 429       vbo_exec_vtx_unmap( exec );
 430    }
 431
 432    if (keepUnmapped || exec->vtx.vertex_size == 0)
 433       exec->vtx.max_vert = 0;
 434    else
 435       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 436                             (exec->vtx.vertex_size * sizeof(GLfloat)));
 437
 438    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 439    exec->vtx.prim_count = 0;
 440    exec->vtx.vert_count = 0;
 441 }