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 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           __FUNCTION__,
  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    GLfloat *dst = exec->vtx.copied.buffer;
  78    const GLfloat *src = (exec->vtx.buffer_map +
  79                          exec->vtx.prim[exec->vtx.prim_count-1].start *
  80                          exec->vtx.vertex_size);
  81
  82
  83    switch (exec->ctx->Driver.CurrentExecPrimitive) {
  84    case GL_POINTS:
  85       return 0;
  86    case GL_LINES:
  87       ovf = nr&1;
  88       for (i = 0 ; i < ovf ; i++)
  89          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  90       return i;
  91    case GL_TRIANGLES:
  92       ovf = nr%3;
  93       for (i = 0 ; i < ovf ; i++)
  94          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  95       return i;
  96    case GL_QUADS:
  97       ovf = nr&3;
  98       for (i = 0 ; i < ovf ; i++)
  99          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 100       return i;
 101    case GL_LINE_STRIP:
 102       if (nr == 0) {
 103          return 0;
 104       }
 105       else {
 106          memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 107          return 1;
 108       }
 109    case GL_LINE_LOOP:
 110    case GL_TRIANGLE_FAN:
 111    case GL_POLYGON:
 112       if (nr == 0) {
 113          return 0;
 114       }
 115       else if (nr == 1) {
 116          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 117          return 1;
 118       }
 119       else {
 120          memcpy( dst, src+0, sz * sizeof(GLfloat) );
 121          memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 122          return 2;
 123       }
 124    case GL_TRIANGLE_STRIP:
 125       /* no parity issue, but need to make sure the tri is not drawn twice */
 126       if (nr & 1) {
 127          exec->vtx.prim[exec->vtx.prim_count-1].count--;
 128       }
 129       /* fallthrough */
 130    case GL_QUAD_STRIP:
 131       switch (nr) {
 132       case 0:
 133          ovf = 0;
 134          break;
 135       case 1:
 136          ovf = 1;
 137          break;
 138       default:
 139          ovf = 2 + (nr & 1);
 140          break;
 141       }
 142       for (i = 0 ; i < ovf ; i++)
 143          memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 144       return i;
 145    case PRIM_OUTSIDE_BEGIN_END:
 146       return 0;
 147    default:
 148       assert(0);
 149       return 0;
 150    }
 151 }
 152
 153
 154
 155 /* TODO: populate these as the vertex is defined:
 156  */
 157 static void
 158 vbo_exec_bind_arrays( struct gl_context *ctx )
 159 {
 160    struct vbo_context *vbo = vbo_context(ctx);
 161    struct vbo_exec_context *exec = &vbo->exec;
 162    struct gl_client_array *arrays = exec->vtx.arrays;
 163    const GLuint count = exec->vtx.vert_count;
 164    const GLuint *map;
 165    GLuint attr;
 166    GLbitfield64 varying_inputs = 0x0;
 167
 168    /* Install the default (ie Current) attributes first, then overlay
 169     * all active ones.
 170     */
 171    switch (get_program_mode(exec->ctx)) {
 172    case VP_NONE:
 173       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 174          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 175       }
 176       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 177          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
 178          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 179             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
 180       }
 181       map = vbo->map_vp_none;
 182       break;
 183    case VP_NV:
 184    case VP_ARB:
 185       /* The aliasing of attributes for NV vertex programs has already
 186        * occurred.  NV vertex programs cannot access material values,
 187        * nor attributes greater than VERT_ATTRIB_TEX7.
 188        */
 189       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
 190          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
 191       }
 192       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
 193          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
 194          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
 195             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
 196       }
 197       map = vbo->map_vp_arb;
 198
 199       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
 200        * In that case we effectively need to route the data from
 201        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
 202        */
 203       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
 204           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
 205          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
 206          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
 207          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
 208          exec->vtx.attrsz[0] = 0;
 209       }
 210       break;
 211    default:
 212       assert(0);
 213    }
 214
 215    /* Make all active attributes (including edgeflag) available as
 216     * arrays of floats.
 217     */
 218    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 219       const GLuint src = map[attr];
 220
 221       if (exec->vtx.attrsz[src]) {
 222          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 223             (GLbyte *)exec->vtx.vertex;
 224
 225          /* override the default array set above */
 226          ASSERT(attr < Elements(exec->vtx.inputs));
 227          ASSERT(attr < Elements(exec->vtx.arrays)); /* arrays[] */
 228          exec->vtx.inputs[attr] = &arrays[attr];
 229
 230          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 231             /* a real buffer obj: Ptr is an offset, not a pointer*/
 232             assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
 233             assert(offset >= 0);
 234             arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->Offset + offset;
 235          }
 236          else {
 237             /* Ptr into ordinary app memory */
 238             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 239          }
 240          arrays[attr].Size = exec->vtx.attrsz[src];
 241          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 242          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 243          arrays[attr].Type = GL_FLOAT;
 244          arrays[attr].Format = GL_RGBA;
 245          arrays[attr].Enabled = 1;
 246          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
 247          _mesa_reference_buffer_object(ctx,
 248                                        &arrays[attr].BufferObj,
 249                                        exec->vtx.bufferobj);
 250          arrays[attr]._MaxElement = count; /* ??? */
 251
 252          varying_inputs |= VERT_BIT(attr);
 253       }
 254    }
 255
 256    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 257    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 258 }
 259
 260
 261 /**
 262  * Unmap the VBO.  This is called before drawing.
 263  */
 264 static void
 265 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 266 {
 267    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 268       struct gl_context *ctx = exec->ctx;
 269
 270       if (ctx->Driver.FlushMappedBufferRange) {
 271          GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
 272          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);
 273
 274          if (length)
 275             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 276                                                exec->vtx.bufferobj);
 277       }
 278
 279       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 280                                 exec->vtx.buffer_map) * sizeof(float);
 281
 282       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 283       assert(exec->vtx.buffer_ptr != NULL);
 284
 285       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
 286       exec->vtx.buffer_map = NULL;
 287       exec->vtx.buffer_ptr = NULL;
 288       exec->vtx.max_vert = 0;
 289    }
 290 }
 291
 292
 293 /**
 294  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 295  */
 296 void
 297 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 298 {
 299    struct gl_context *ctx = exec->ctx;
 300    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 301                               GL_MAP_INVALIDATE_RANGE_BIT |
 302                               GL_MAP_UNSYNCHRONIZED_BIT |
 303                               GL_MAP_FLUSH_EXPLICIT_BIT |
 304                               MESA_MAP_NOWAIT_BIT;
 305    const GLenum usage = GL_STREAM_DRAW_ARB;
 306
 307    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 308       return;
 309
 310    assert(!exec->vtx.buffer_map);
 311    assert(!exec->vtx.buffer_ptr);
 312
 313    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 314       /* The VBO exists and there's room for more */
 315       if (exec->vtx.bufferobj->Size > 0) {
 316          exec->vtx.buffer_map =
 317             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
 318                                                   exec->vtx.buffer_used,
 319                                                   (VBO_VERT_BUFFER_SIZE -
 320                                                    exec->vtx.buffer_used),
 321                                                   accessRange,
 322                                                   exec->vtx.bufferobj);
 323          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 324       }
 325       else {
 326          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 327       }
 328    }
 329
 330    if (!exec->vtx.buffer_map) {
 331       /* Need to allocate a new VBO */
 332       exec->vtx.buffer_used = 0;
 333
 334       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 335                                   VBO_VERT_BUFFER_SIZE,
 336                                   NULL, usage, exec->vtx.bufferobj)) {
 337          /* buffer allocation worked, now map the buffer */
 338          exec->vtx.buffer_map =
 339             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
 340                                                   0, VBO_VERT_BUFFER_SIZE,
 341                                                   accessRange,
 342                                                   exec->vtx.bufferobj);
 343       }
 344       else {
 345          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 346          exec->vtx.buffer_map = NULL;
 347       }
 348    }
 349
 350    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 351
 352    if (!exec->vtx.buffer_map) {
 353       /* out of memory */
 354       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
 355    }
 356    else {
 357       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 358          /* The no-op functions are installed so switch back to regular
 359           * functions.  We do this test just to avoid frequent and needless
 360           * calls to _mesa_install_exec_vtxfmt().
 361           */
 362          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 363       }
 364    }
 365
 366    if (0)
 367       printf("map %d..\n", exec->vtx.buffer_used);
 368 }
 369
 370
 371
 372 /**
 373  * Execute the buffer and save copied verts.
 374  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 375  */
 376 void
 377 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 378 {
 379    if (0)
 380       vbo_exec_debug_verts( exec );
 381
 382    if (exec->vtx.prim_count &&
 383        exec->vtx.vert_count) {
 384
 385       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 386
 387       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 388          struct gl_context *ctx = exec->ctx;
 389
 390          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 391           * from _mesa_set_varying_vp_inputs().
 392           */
 393          vbo_exec_bind_arrays( ctx );
 394
 395          if (ctx->NewState)
 396             _mesa_update_state( ctx );
 397
 398          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 399             vbo_exec_vtx_unmap( exec );
 400          }
 401
 402          if (0)
 403             printf("%s %d %d\n", __FUNCTION__, exec->vtx.prim_count,
 404                    exec->vtx.vert_count);
 405
 406          vbo_context(ctx)->draw_prims( ctx,
 407                                        exec->vtx.prim,
 408                                        exec->vtx.prim_count,
 409                                        NULL,
 410                                        GL_TRUE,
 411                                        0,
 412                                        exec->vtx.vert_count - 1,
 413                                        NULL);
 414
 415          /* If using a real VBO, get new storage -- unless asked not to.
 416           */
 417          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
 418             vbo_exec_vtx_map( exec );
 419          }
 420       }
 421    }
 422
 423    /* May have to unmap explicitly if we didn't draw:
 424     */
 425    if (keepUnmapped &&
 426        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
 427        exec->vtx.buffer_map) {
 428       vbo_exec_vtx_unmap( exec );
 429    }
 430
 431    if (keepUnmapped || exec->vtx.vertex_size == 0)
 432       exec->vtx.max_vert = 0;
 433    else
 434       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 435                             (exec->vtx.vertex_size * sizeof(GLfloat)));
 436
 437    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 438    exec->vtx.prim_count = 0;
 439    exec->vtx.vert_count = 0;
 440 }