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/arrayobj.h"
  31 #include "main/glheader.h"
  32 #include "main/bufferobj.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_noop.h"
  39 #include "vbo_private.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       unreachable("Unexpected primitive type");
 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    GLuint attr;
 179    GLbitfield varying_inputs = 0x0;
 180
 181    const enum vp_mode program_mode = get_vp_mode(exec->ctx);
 182    const GLubyte * const map = _vbo_attribute_alias_map[program_mode];
 183
 184    /* Grab VERT_ATTRIB_{POS,GENERIC0} from VBO_ATTRIB_POS */
 185    const gl_attribute_map_mode mode = ATTRIBUTE_MAP_MODE_POSITION;
 186    const GLubyte *const array_map = _mesa_vao_attribute_map[mode];
 187    for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
 188       const GLuint src = map[array_map[attr]];
 189       const GLubyte size = exec->vtx.attrsz[src];
 190
 191       if (size == 0) {
 192          exec->vtx.inputs[attr] = &vbo->currval[map[attr]];
 193       } else {
 194          GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 195             (GLbyte *)exec->vtx.vertex;
 196
 197          /* override the default array set above */
 198          assert(attr < ARRAY_SIZE(exec->vtx.inputs));
 199          assert(attr < ARRAY_SIZE(exec->vtx.arrays)); /* arrays[] */
 200          exec->vtx.inputs[attr] = &arrays[attr];
 201
 202          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 203             /* a real buffer obj: Ptr is an offset, not a pointer */
 204             assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 205             assert(offset >= 0);
 206             arrays[attr].Ptr = (GLubyte *)
 207                exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset + offset;
 208          }
 209          else {
 210             /* Ptr into ordinary app memory */
 211             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
 212          }
 213          arrays[attr].Size = size;
 214          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 215          const GLenum16 type = exec->vtx.attrtype[src];
 216          arrays[attr].Type = type;
 217          arrays[attr].Integer = vbo_attrtype_to_integer_flag(type);
 218          arrays[attr].Format = GL_RGBA;
 219          arrays[attr]._ElementSize = size * sizeof(GLfloat);
 220          _mesa_reference_buffer_object(ctx,
 221                                        &arrays[attr].BufferObj,
 222                                        exec->vtx.bufferobj);
 223
 224          varying_inputs |= VERT_BIT(attr);
 225       }
 226    }
 227
 228    _mesa_set_varying_vp_inputs(ctx, varying_inputs);
 229    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 230 }
 231
 232
 233 /**
 234  * Unmap the VBO.  This is called before drawing.
 235  */
 236 static void
 237 vbo_exec_vtx_unmap(struct vbo_exec_context *exec)
 238 {
 239    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 240       struct gl_context *ctx = exec->ctx;
 241
 242       if (ctx->Driver.FlushMappedBufferRange) {
 243          GLintptr offset = exec->vtx.buffer_used -
 244                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 245          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 246                              sizeof(float);
 247
 248          if (length)
 249             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 250                                                exec->vtx.bufferobj,
 251                                                MAP_INTERNAL);
 252       }
 253
 254       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 255                                 exec->vtx.buffer_map) * sizeof(float);
 256
 257       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 258       assert(exec->vtx.buffer_ptr != NULL);
 259
 260       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 261       exec->vtx.buffer_map = NULL;
 262       exec->vtx.buffer_ptr = NULL;
 263       exec->vtx.max_vert = 0;
 264    }
 265 }
 266
 267
 268 /**
 269  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 270  */
 271 void
 272 vbo_exec_vtx_map(struct vbo_exec_context *exec)
 273 {
 274    struct gl_context *ctx = exec->ctx;
 275    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 276                               GL_MAP_INVALIDATE_RANGE_BIT |
 277                               GL_MAP_UNSYNCHRONIZED_BIT |
 278                               GL_MAP_FLUSH_EXPLICIT_BIT |
 279                               MESA_MAP_NOWAIT_BIT;
 280    const GLenum usage = GL_STREAM_DRAW_ARB;
 281
 282    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 283       return;
 284
 285    assert(!exec->vtx.buffer_map);
 286    assert(!exec->vtx.buffer_ptr);
 287
 288    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 289       /* The VBO exists and there's room for more */
 290       if (exec->vtx.bufferobj->Size > 0) {
 291          exec->vtx.buffer_map = (fi_type *)
 292             ctx->Driver.MapBufferRange(ctx,
 293                                        exec->vtx.buffer_used,
 294                                        VBO_VERT_BUFFER_SIZE
 295                                        - exec->vtx.buffer_used,
 296                                        accessRange,
 297                                        exec->vtx.bufferobj,
 298                                        MAP_INTERNAL);
 299          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 300       }
 301       else {
 302          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 303       }
 304    }
 305
 306    if (!exec->vtx.buffer_map) {
 307       /* Need to allocate a new VBO */
 308       exec->vtx.buffer_used = 0;
 309
 310       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 311                                  VBO_VERT_BUFFER_SIZE,
 312                                  NULL, usage,
 313                                  GL_MAP_WRITE_BIT |
 314                                  GL_DYNAMIC_STORAGE_BIT |
 315                                  GL_CLIENT_STORAGE_BIT,
 316                                  exec->vtx.bufferobj)) {
 317          /* buffer allocation worked, now map the buffer */
 318          exec->vtx.buffer_map =
 319             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 320                                                   0, VBO_VERT_BUFFER_SIZE,
 321                                                   accessRange,
 322                                                   exec->vtx.bufferobj,
 323                                                   MAP_INTERNAL);
 324       }
 325       else {
 326          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 327          exec->vtx.buffer_map = NULL;
 328       }
 329    }
 330
 331    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 332
 333    if (!exec->vtx.buffer_map) {
 334       /* out of memory */
 335       _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt_noop);
 336    }
 337    else {
 338       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 339          /* The no-op functions are installed so switch back to regular
 340           * functions.  We do this test just to avoid frequent and needless
 341           * calls to _mesa_install_exec_vtxfmt().
 342           */
 343          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 344       }
 345    }
 346
 347    if (0)
 348       printf("map %d..\n", exec->vtx.buffer_used);
 349 }
 350
 351
 352
 353 /**
 354  * Execute the buffer and save copied verts.
 355  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 356  */
 357 void
 358 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 359 {
 360    if (0)
 361       vbo_exec_debug_verts(exec);
 362
 363    if (exec->vtx.prim_count &&
 364        exec->vtx.vert_count) {
 365
 366       exec->vtx.copied.nr = vbo_copy_vertices(exec);
 367
 368       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 369          struct gl_context *ctx = exec->ctx;
 370
 371          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 372           * from _mesa_set_varying_vp_inputs().
 373           */
 374          vbo_exec_bind_arrays(ctx);
 375
 376          if (ctx->NewState)
 377             _mesa_update_state(ctx);
 378
 379          vbo_exec_vtx_unmap(exec);
 380
 381          if (0)
 382             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 383                    exec->vtx.vert_count);
 384
 385          vbo_context(ctx)->draw_prims(ctx,
 386                                       exec->vtx.prim,
 387                                       exec->vtx.prim_count,
 388                                       NULL,
 389                                       GL_TRUE,
 390                                       0,
 391                                       exec->vtx.vert_count - 1,
 392                                       NULL, 0, NULL);
 393
 394          /* Get new storage -- unless asked not to. */
 395          if (!keepUnmapped)
 396             vbo_exec_vtx_map(exec);
 397       }
 398    }
 399
 400    /* May have to unmap explicitly if we didn't draw:
 401     */
 402    if (keepUnmapped && exec->vtx.buffer_map) {
 403       vbo_exec_vtx_unmap(exec);
 404    }
 405
 406    if (keepUnmapped || exec->vtx.vertex_size == 0)
 407       exec->vtx.max_vert = 0;
 408    else
 409       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 410
 411    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 412    exec->vtx.prim_count = 0;
 413    exec->vtx.vert_count = 0;
 414 }