src/mesa/vbo/vbo_exec_draw.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.2
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/bufferobj.h"
  30 #include "main/compiler.h"
  31 #include "main/context.h"
  32 #include "main/enums.h"
  33 #include "main/state.h"
  34 #include "main/vtxfmt.h"
  35
  36 #include "vbo_context.h"
  37 #include "vbo_noop.h"
  38
  39
  40 static void
  41 vbo_exec_debug_verts( struct vbo_exec_context *exec )
  42 {
  43    GLuint count = exec->vtx.vert_count;
  44    GLuint i;
  45
  46    printf("%s: %u vertices %d primitives, %d vertsize\n",
  47           __FUNCTION__,
  48           count,
  49           exec->vtx.prim_count,
  50           exec->vtx.vertex_size);
  51
  52    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  53       struct _mesa_prim *prim = &exec->vtx.prim[i];
  54       printf("   prim %d: %s%s %d..%d %s %s\n",
  55              i,
  56              _mesa_lookup_prim_by_nr(prim->mode),
  57              prim->weak ? " (weak)" : "",
  58              prim->start,
  59              prim->start + prim->count,
  60              prim->begin ? "BEGIN" : "(wrap)",
  61              prim->end ? "END" : "(wrap)");
  62    }
  63 }
  64
  65
  66 /*
  67  * NOTE: Need to have calculated primitives by this point -- do it on the fly.
  68  * NOTE: Old 'parity' issue is gone.
  69  */
  70 static GLuint
  71 vbo_copy_vertices( struct vbo_exec_context *exec )
  72 {
  73    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
  74    GLuint ovf, i;
  75    GLuint sz = exec->vtx.vertex_size;
  76    GLfloat *dst = exec->vtx.copied.buffer;
  77    const GLfloat *src = (exec->vtx.buffer_map +
  78                          exec->vtx.prim[exec->vtx.prim_count-1].start *
  79                          exec->vtx.vertex_size);
  80
  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 count = exec->vtx.vert_count;
 163    const GLuint *map;
 164    GLuint attr;
 165    GLbitfield64 varying_inputs = 0x0;
 166
 167    /* Install the default (ie Current) attributes first, then overlay
 168     * all active ones.
 169     */
 170    switch (get_program_mode(exec->ctx)) {
 171    case VP_NONE:
 172       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 173          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 174       }
 175       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 176          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
 177          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 178             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 179       }
 180       map = vbo->map_vp_none;
 181       break;
 182    case VP_ARB:
 183       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 184          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 185       }
 186       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 187          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
 188          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 189             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 190       }
 191       map = vbo->map_vp_arb;
 192
 193       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 194        * In that case we effectively need to route the data from
 195        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 196        */
 197       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 198           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 199          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 200          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 201          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 202          exec->vtx.attrsz[0] = 0;
 203       }
 204       break;
 205    default:
 206       assert(0);
 207    }
 208
 209    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 210       const GLuint src = map[attr];
 211
 212       if (exec->vtx.attrsz[src]) {
 213          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 214             (GLbyte *)exec->vtx.vertex;
 215
 216          /* override the default array set above */
 217          ASSERT(attr < Elements(exec->vtx.inputs));
 218          ASSERT(attr < Elements(exec->vtx.arrays)); /* arrays[] */
 219          exec->vtx.inputs[attr] = &arrays[attr];
 220
 221          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 222             /* a real buffer obj: Ptr is an offset, not a pointer*/
 223             assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
 224             assert(offset >= 0);
 225             arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->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          arrays[attr]._MaxElement = count; /* ??? */
 244
 245          varying_inputs |= VERT_BIT(attr);
 246       }
 247    }
 248
 249    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 250    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 251 }
 252
 253
 254 /**
 255  * Unmap the VBO.  This is called before drawing.
 256  */
 257 static void
 258 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 259 {
 260    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 261       struct gl_context *ctx = exec->ctx;
 262
 263       if (ctx->Driver.FlushMappedBufferRange) {
 264          GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
 265          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);
 266
 267          if (length)
 268             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 269                                                exec->vtx.bufferobj);
 270       }
 271
 272       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 273                                 exec->vtx.buffer_map) * sizeof(float);
 274
 275       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 276       assert(exec->vtx.buffer_ptr != NULL);
 277
 278       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
 279       exec->vtx.buffer_map = NULL;
 280       exec->vtx.buffer_ptr = NULL;
 281       exec->vtx.max_vert = 0;
 282    }
 283 }
 284
 285
 286 /**
 287  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 288  */
 289 void
 290 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 291 {
 292    struct gl_context *ctx = exec->ctx;
 293    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 294                               GL_MAP_INVALIDATE_RANGE_BIT |
 295                               GL_MAP_UNSYNCHRONIZED_BIT |
 296                               GL_MAP_FLUSH_EXPLICIT_BIT |
 297                               MESA_MAP_NOWAIT_BIT;
 298    const GLenum usage = GL_STREAM_DRAW_ARB;
 299
 300    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 301       return;
 302
 303    assert(!exec->vtx.buffer_map);
 304    assert(!exec->vtx.buffer_ptr);
 305
 306    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 307       /* The VBO exists and there's room for more */
 308       if (exec->vtx.bufferobj->Size > 0) {
 309          exec->vtx.buffer_map =
 310             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
 311                                                   exec->vtx.buffer_used,
 312                                                   (VBO_VERT_BUFFER_SIZE -
 313                                                    exec->vtx.buffer_used),
 314                                                   accessRange,
 315                                                   exec->vtx.bufferobj);
 316          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 317       }
 318       else {
 319          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 320       }
 321    }
 322
 323    if (!exec->vtx.buffer_map) {
 324       /* Need to allocate a new VBO */
 325       exec->vtx.buffer_used = 0;
 326
 327       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 328                                   VBO_VERT_BUFFER_SIZE,
 329                                   NULL, usage, exec->vtx.bufferobj)) {
 330          /* buffer allocation worked, now map the buffer */
 331          exec->vtx.buffer_map =
 332             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
 333                                                   0, VBO_VERT_BUFFER_SIZE,
 334                                                   accessRange,
 335                                                   exec->vtx.bufferobj);
 336       }
 337       else {
 338          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 339          exec->vtx.buffer_map = NULL;
 340       }
 341    }
 342
 343    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 344
 345    if (!exec->vtx.buffer_map) {
 346       /* out of memory */
 347       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 348    }
 349    else {
 350       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 351          /* The no-op functions are installed so switch back to regular
 352           * functions.  We do this test just to avoid frequent and needless
 353           * calls to _mesa_install_exec_vtxfmt().
 354           */
 355          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 356       }
 357    }
 358
 359    if (0)
 360       printf("map %d..\n", exec->vtx.buffer_used);
 361 }
 362
 363
 364
 365 /**
 366  * Execute the buffer and save copied verts.
 367  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 368  */
 369 void
 370 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 371 {
 372    if (0)
 373       vbo_exec_debug_verts( exec );
 374
 375    if (exec->vtx.prim_count &&
 376        exec->vtx.vert_count) {
 377
 378       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 379
 380       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 381          struct gl_context *ctx = exec->ctx;
 382
 383          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 384           * from _mesa_set_varying_vp_inputs().
 385           */
 386          vbo_exec_bind_arrays( ctx );
 387
 388          if (ctx->NewState)
 389             _mesa_update_state( ctx );
 390
 391          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 392             vbo_exec_vtx_unmap( exec );
 393          }
 394
 395          if (0)
 396             printf("%s %d %d\n", __FUNCTION__, exec->vtx.prim_count,
 397                    exec->vtx.vert_count);
 398
 399          vbo_context(ctx)->draw_prims( ctx,
 400                                        exec->vtx.prim,
 401                                        exec->vtx.prim_count,
 402                                        NULL,
 403                                        GL_TRUE,
 404                                        0,
 405                                        exec->vtx.vert_count - 1,
 406                                        NULL);
 407
 408          /* If using a real VBO, get new storage -- unless asked not to.
 409           */
 410          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 411             vbo_exec_vtx_map( exec );
 412          }
 413       }
 414    }
 415
 416    /* May have to unmap explicitly if we didn't draw:
 417     */
 418    if (keepUnmapped &&
 419        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 420        exec->vtx.buffer_map) {
 421       vbo_exec_vtx_unmap( exec );
 422    }
 423
 424    if (keepUnmapped || exec->vtx.vertex_size == 0)
 425       exec->vtx.max_vert = 0;
 426    else
 427       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 428                             (exec->vtx.vertex_size * sizeof(GLfloat)));
 429
 430    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 431    exec->vtx.prim_count = 0;
 432    exec->vtx.vert_count = 0;
 433 }