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  * BRIAN PAUL 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/mfeatures.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 #if FEATURE_beginend
  42
  43
  44 static void
  45 vbo_exec_debug_verts( struct vbo_exec_context *exec )
  46 {
  47    GLuint count = exec->vtx.vert_count;
  48    GLuint i;
  49
  50    printf("%s: %u vertices %d primitives, %d vertsize\n",
  51           __FUNCTION__,
  52           count,
  53           exec->vtx.prim_count,
  54           exec->vtx.vertex_size);
  55
  56    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  57       struct _mesa_prim *prim = &exec->vtx.prim[i];
  58       printf("   prim %d: %s%s %d..%d %s %s\n",
  59              i,
  60              _mesa_lookup_prim_by_nr(prim->mode),
  61              prim->weak ? " (weak)" : "",
  62              prim->start,
  63              prim->start + prim->count,
  64              prim->begin ? "BEGIN" : "(wrap)",
  65              prim->end ? "END" : "(wrap)");
  66    }
  67 }
  68
  69
  70 /*
  71  * NOTE: Need to have calculated primitives by this point -- do it on the fly.
  72  * NOTE: Old 'parity' issue is gone.
  73  */
  74 static GLuint
  75 vbo_copy_vertices( struct vbo_exec_context *exec )
  76 {
  77    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
  78    GLuint ovf, i;
  79    GLuint sz = exec->vtx.vertex_size;
  80    GLfloat *dst = exec->vtx.copied.buffer;
  81    const GLfloat *src = (exec->vtx.buffer_map +
  82                          exec->vtx.prim[exec->vtx.prim_count-1].start *
  83                          exec->vtx.vertex_size);
  84
  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    case GL_TRIANGLE_FAN:
 114    case GL_POLYGON:
 115       if (nr == 0) {
 116          return 0;
 117       }
 118       else if (nr == 1) {
 119          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 120          return 1;
 121       }
 122       else {
 123          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 124          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 125          return 2;
 126       }
 127    case GL_TRIANGLE_STRIP:
 128       /* no parity issue, but need to make sure the tri is not drawn twice */
 129       if (nr & 1) {
 130          exec->vtx.prim[exec->vtx.prim_count-1].count--;
 131       }
 132       /* fallthrough */
 133    case GL_QUAD_STRIP:
 134       switch (nr) {
 135       case 0:
 136          ovf = 0;
 137          break;
 138       case 1:
 139          ovf = 1;
 140          break;
 141       default:
 142          ovf = 2 + (nr & 1);
 143          break;
 144       }
 145       for (i = 0 ; i < ovf ; i++)
 146          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 147       return i;
 148    case PRIM_OUTSIDE_BEGIN_END:
 149       return 0;
 150    default:
 151       assert(0);
 152       return 0;
 153    }
 154 }
 155
 156
 157
 158 /* TODO: populate these as the vertex is defined:
 159  */
 160 static void
 161 vbo_exec_bind_arrays( struct gl_context *ctx )
 162 {
 163    struct vbo_context *vbo = vbo_context(ctx);
 164    struct vbo_exec_context *exec = &vbo->exec;
 165    struct gl_client_array *arrays = exec->vtx.arrays;
 166    const GLuint count = exec->vtx.vert_count;
 167    const GLuint *map;
 168    GLuint attr;
 169    GLbitfield64 varying_inputs = 0x0;
 170
 171    /* Install the default (ie Current) attributes first, then overlay
 172     * all active ones.
 173     */
 174    switch (get_program_mode(exec->ctx)) {
 175    case VP_NONE:
 176       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 177          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 178       }
 179       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 180          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
 181          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] = &vbo->mat_currval[attr];
 182       }
 183       map = vbo->map_vp_none;
 184       break;
 185    case VP_NV:
 186    case VP_ARB:
 187       /* The aliasing of attributes for NV vertex programs has already
 188        * occurred.  NV vertex programs cannot access material values,
 189        * nor attributes greater than VERT_ATTRIB_TEX7.
 190        */
 191       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 192          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 193       }
 194       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 195          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
 196          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 197             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 198       }
 199       map = vbo->map_vp_arb;
 200
 201       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 202        * In that case we effectively need to route the data from
 203        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 204        */
 205       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 206           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 207          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 208          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 209          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 210          exec->vtx.attrsz[0] = 0;
 211       }
 212       break;
 213    default:
 214       assert(0);
 215    }
 216
 217    /* Make all active attributes (including edgeflag) available as
 218     * arrays of floats.
 219     */
 220    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 221       const GLuint src = map[attr];
 222
 223       if (exec->vtx.attrsz[src]) {
 224          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 225             (GLbyte *)exec->vtx.vertex;
 226
 227          /* override the default array set above */
 228          ASSERT(attr < Elements(exec->vtx.inputs));
 229          ASSERT(attr < Elements(exec->vtx.arrays)); /* arrays[] */
 230          exec->vtx.inputs[attr] = &arrays[attr];
 231
 232          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 233             /* a real buffer obj: Ptr is an offset, not a pointer*/
 234             assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
 235             assert(offset >= 0);
 236             arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->Offset + offset;
 237          }
 238          else {
 239             /* Ptr into ordinary app memory */
 240             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 241          }
 242          arrays[attr].Size = exec->vtx.attrsz[src];
 243          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 244          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 245          arrays[attr].Type = GL_FLOAT;
 246          arrays[attr].Format = GL_RGBA;
 247          arrays[attr].Enabled = 1;
 248          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 249          _mesa_reference_buffer_object(ctx,
 250                                        &arrays[attr].BufferObj,
 251                                        exec->vtx.bufferobj);
 252          arrays[attr]._MaxElement = count; /* ??? */
 253
 254          varying_inputs |= VERT_BIT(attr);
 255          ctx->NewState |= _NEW_ARRAY;
 256       }
 257    }
 258
 259    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 260 }
 261
 262
 263 /**
 264  * Unmap the VBO.  This is called before drawing.
 265  */
 266 static void
 267 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 268 {
 269    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 270       struct gl_context *ctx = exec->ctx;
 271
 272       if (ctx->Driver.FlushMappedBufferRange) {
 273          GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
 274          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);
 275
 276          if (length)
 277             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 278                                                exec->vtx.bufferobj);
 279       }
 280
 281       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 282                                 exec->vtx.buffer_map) * sizeof(float);
 283
 284       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 285       assert(exec->vtx.buffer_ptr != NULL);
 286
 287       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
 288       exec->vtx.buffer_map = NULL;
 289       exec->vtx.buffer_ptr = NULL;
 290       exec->vtx.max_vert = 0;
 291    }
 292 }
 293
 294
 295 /**
 296  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 297  */
 298 void
 299 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 300 {
 301    struct gl_context *ctx = exec->ctx;
 302    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 303                               GL_MAP_INVALIDATE_RANGE_BIT |
 304                               GL_MAP_UNSYNCHRONIZED_BIT |
 305                               GL_MAP_FLUSH_EXPLICIT_BIT |
 306                               MESA_MAP_NOWAIT_BIT;
 307    const GLenum usage = GL_STREAM_DRAW_ARB;
 308
 309    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 310       return;
 311
 312    assert(!exec->vtx.buffer_map);
 313    assert(!exec->vtx.buffer_ptr);
 314
 315    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 316       /* The VBO exists and there's room for more */
 317       if (exec->vtx.bufferobj->Size > 0) {
 318          exec->vtx.buffer_map =
 319             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
 320                                                   exec->vtx.buffer_used,
 321                                                   (VBO_VERT_BUFFER_SIZE -
 322                                                    exec->vtx.buffer_used),
 323                                                   accessRange,
 324                                                   exec->vtx.bufferobj);
 325          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 326       }
 327       else {
 328          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 329       }
 330    }
 331
 332    if (!exec->vtx.buffer_map) {
 333       /* Need to allocate a new VBO */
 334       exec->vtx.buffer_used = 0;
 335
 336       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 337                                   VBO_VERT_BUFFER_SIZE,
 338                                   NULL, usage, exec->vtx.bufferobj)) {
 339          /* buffer allocation worked, now map the buffer */
 340          exec->vtx.buffer_map =
 341             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
 342                                                   0, VBO_VERT_BUFFER_SIZE,
 343                                                   accessRange,
 344                                                   exec->vtx.bufferobj);
 345       }
 346       else {
 347          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 348          exec->vtx.buffer_map = NULL;
 349       }
 350    }
 351
 352    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 353
 354    if (!exec->vtx.buffer_map) {
 355       /* out of memory */
 356       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 357    }
 358    else {
 359       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 360          /* The no-op functions are installed so switch back to regular
 361           * functions.  We do this test just to avoid frequent and needless
 362           * calls to _mesa_install_exec_vtxfmt().
 363           */
 364          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 365       }
 366    }
 367
 368    if (0)
 369       printf("map %d..\n", exec->vtx.buffer_used);
 370 }
 371
 372
 373
 374 /**
 375  * Execute the buffer and save copied verts.
 376  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 377  */
 378 void
 379 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 380 {
 381    if (0)
 382       vbo_exec_debug_verts( exec );
 383
 384    if (exec->vtx.prim_count &&
 385        exec->vtx.vert_count) {
 386
 387       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 388
 389       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 390          struct gl_context *ctx = exec->ctx;
 391
 392          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 393           * from _mesa_set_varying_vp_inputs().
 394           */
 395          vbo_exec_bind_arrays( ctx );
 396
 397          if (ctx->NewState)
 398             _mesa_update_state( ctx );
 399
 400          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 401             vbo_exec_vtx_unmap( exec );
 402          }
 403
 404          if (0)
 405             printf("%s %d %d\n", __FUNCTION__, exec->vtx.prim_count,
 406                    exec->vtx.vert_count);
 407
 408          vbo_context(ctx)->draw_prims( ctx,
 409                                        exec->vtx.inputs,
 410                                        exec->vtx.prim,
 411                                        exec->vtx.prim_count,
 412                                        NULL,
 413                                        GL_TRUE,
 414                                        0,
 415                                        exec->vtx.vert_count - 1,
 416                                        NULL);
 417
 418          /* If using a real VBO, get new storage -- unless asked not to.
 419           */
 420          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 421             vbo_exec_vtx_map( exec );
 422          }
 423       }
 424    }
 425
 426    /* May have to unmap explicitly if we didn't draw:
 427     */
 428    if (keepUnmapped &&
 429        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 430        exec->vtx.buffer_map) {
 431       vbo_exec_vtx_unmap( exec );
 432    }
 433
 434    if (keepUnmapped || exec->vtx.vertex_size == 0)
 435       exec->vtx.max_vert = 0;
 436    else
 437       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 438                             (exec->vtx.vertex_size * sizeof(GLfloat)));
 439
 440    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 441    exec->vtx.prim_count = 0;
 442    exec->vtx.vert_count = 0;
 443 }
 444
 445
 446 #endif /* FEATURE_beginend */