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/varray.h"
  37 #include "main/vtxfmt.h"
  38
  39 #include "vbo_noop.h"
  40 #include "vbo_private.h"
  41
  42
  43 static void
  44 vbo_exec_debug_verts(struct vbo_exec_context *exec)
  45 {
  46    GLuint count = exec->vtx.vert_count;
  47    GLuint i;
  48
  49    printf("%s: %u vertices %d primitives, %d vertsize\n",
  50           __func__,
  51           count,
  52           exec->vtx.prim_count,
  53           exec->vtx.vertex_size);
  54
  55    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  56       struct _mesa_prim *prim = &exec->vtx.prim[i];
  57       printf("   prim %d: %s %d..%d %s %s\n",
  58              i,
  59              _mesa_lookup_prim_by_nr(prim->mode),
  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 gl_vertex_array_object *vao = vbo->VAO;
 177    struct vbo_exec_context *exec = &vbo->exec;
 178
 179    GLintptr buffer_offset;
 180    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 181       assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 182       buffer_offset = exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 183    } else {
 184       /* Ptr into ordinary app memory */
 185       buffer_offset = (GLbyte *)exec->vtx.buffer_map - (GLbyte *)NULL;
 186    }
 187
 188    const gl_vertex_processing_mode mode = ctx->VertexProgram._VPMode;
 189
 190    /* Compute the bitmasks of vao_enabled arrays */
 191    GLbitfield vao_enabled = _vbo_get_vao_enabled_from_vbo(mode, exec->vtx.enabled);
 192
 193    /* At first disable arrays no longer needed */
 194    GLbitfield mask = vao->_Enabled & ~vao_enabled;
 195    while (mask) {
 196       const int vao_attr = u_bit_scan(&mask);
 197       _mesa_disable_vertex_array_attrib(ctx, vao, vao_attr);
 198    }
 199    assert((~vao_enabled & vao->_Enabled) == 0);
 200
 201    /* Bind the buffer object */
 202    const GLuint stride = exec->vtx.vertex_size*sizeof(GLfloat);
 203    _mesa_bind_vertex_buffer(ctx, vao, 0, exec->vtx.bufferobj, buffer_offset,
 204                             stride);
 205
 206    /* Retrieve the mapping from VBO_ATTRIB to VERT_ATTRIB space
 207     * Note that the position/generic0 aliasing is done in the VAO.
 208     */
 209    const GLubyte *const vao_to_vbo_map = _vbo_attribute_alias_map[mode];
 210    /* Now set the enabled arrays */
 211    mask = vao_enabled;
 212    while (mask) {
 213       const int vao_attr = u_bit_scan(&mask);
 214       const GLubyte vbo_attr = vao_to_vbo_map[vao_attr];
 215
 216       const GLubyte size = exec->vtx.attrsz[vbo_attr];
 217       const GLenum16 type = exec->vtx.attrtype[vbo_attr];
 218       const GLuint offset = (GLuint)((GLbyte *)exec->vtx.attrptr[vbo_attr] -
 219                                      (GLbyte *)exec->vtx.vertex);
 220       assert(offset <= ctx->Const.MaxVertexAttribRelativeOffset);
 221
 222       /* Set and enable */
 223       _vbo_set_attrib_format(ctx, vao, vao_attr, buffer_offset,
 224                              size, type, offset);
 225       if ((vao->_Enabled & VERT_BIT(vao_attr)) == 0)
 226          _mesa_enable_vertex_array_attrib(ctx, vao, vao_attr);
 227
 228       /* The vao is initially created with all bindings set to 0. */
 229       assert(vao->VertexAttrib[vao_attr].BufferBindingIndex == 0);
 230    }
 231    assert(vao_enabled == vao->_Enabled);
 232    assert(!_mesa_is_bufferobj(exec->vtx.bufferobj) ||
 233           (vao_enabled & ~vao->VertexAttribBufferMask) == 0);
 234
 235    _mesa_set_draw_vao(ctx, vao, _vbo_get_vao_filter(mode));
 236 }
 237
 238
 239 /**
 240  * Unmap the VBO.  This is called before drawing.
 241  */
 242 static void
 243 vbo_exec_vtx_unmap(struct vbo_exec_context *exec)
 244 {
 245    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 246       struct gl_context *ctx = exec->ctx;
 247
 248       if (ctx->Driver.FlushMappedBufferRange) {
 249          GLintptr offset = exec->vtx.buffer_used -
 250                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 251          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 252                              sizeof(float);
 253
 254          if (length)
 255             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 256                                                exec->vtx.bufferobj,
 257                                                MAP_INTERNAL);
 258       }
 259
 260       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 261                                 exec->vtx.buffer_map) * sizeof(float);
 262
 263       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 264       assert(exec->vtx.buffer_ptr != NULL);
 265
 266       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 267       exec->vtx.buffer_map = NULL;
 268       exec->vtx.buffer_ptr = NULL;
 269       exec->vtx.max_vert = 0;
 270    }
 271 }
 272
 273
 274 /**
 275  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 276  */
 277 void
 278 vbo_exec_vtx_map(struct vbo_exec_context *exec)
 279 {
 280    struct gl_context *ctx = exec->ctx;
 281    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 282                               GL_MAP_INVALIDATE_RANGE_BIT |
 283                               GL_MAP_UNSYNCHRONIZED_BIT |
 284                               GL_MAP_FLUSH_EXPLICIT_BIT |
 285                               MESA_MAP_NOWAIT_BIT;
 286    const GLenum usage = GL_STREAM_DRAW_ARB;
 287
 288    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 289       return;
 290
 291    assert(!exec->vtx.buffer_map);
 292    assert(!exec->vtx.buffer_ptr);
 293
 294    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 295       /* The VBO exists and there's room for more */
 296       if (exec->vtx.bufferobj->Size > 0) {
 297          exec->vtx.buffer_map = (fi_type *)
 298             ctx->Driver.MapBufferRange(ctx,
 299                                        exec->vtx.buffer_used,
 300                                        VBO_VERT_BUFFER_SIZE
 301                                        - exec->vtx.buffer_used,
 302                                        accessRange,
 303                                        exec->vtx.bufferobj,
 304                                        MAP_INTERNAL);
 305          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 306       }
 307       else {
 308          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 309       }
 310    }
 311
 312    if (!exec->vtx.buffer_map) {
 313       /* Need to allocate a new VBO */
 314       exec->vtx.buffer_used = 0;
 315
 316       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 317                                  VBO_VERT_BUFFER_SIZE,
 318                                  NULL, usage,
 319                                  GL_MAP_WRITE_BIT |
 320                                  GL_DYNAMIC_STORAGE_BIT |
 321                                  GL_CLIENT_STORAGE_BIT,
 322                                  exec->vtx.bufferobj)) {
 323          /* buffer allocation worked, now map the buffer */
 324          exec->vtx.buffer_map =
 325             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 326                                                   0, VBO_VERT_BUFFER_SIZE,
 327                                                   accessRange,
 328                                                   exec->vtx.bufferobj,
 329                                                   MAP_INTERNAL);
 330       }
 331       else {
 332          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 333          exec->vtx.buffer_map = NULL;
 334       }
 335    }
 336
 337    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 338
 339    if (!exec->vtx.buffer_map) {
 340       /* out of memory */
 341       _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt_noop);
 342    }
 343    else {
 344       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 345          /* The no-op functions are installed so switch back to regular
 346           * functions.  We do this test just to avoid frequent and needless
 347           * calls to _mesa_install_exec_vtxfmt().
 348           */
 349          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 350       }
 351    }
 352
 353    if (0)
 354       printf("map %d..\n", exec->vtx.buffer_used);
 355 }
 356
 357
 358
 359 /**
 360  * Execute the buffer and save copied verts.
 361  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 362  */
 363 void
 364 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 365 {
 366    if (0)
 367       vbo_exec_debug_verts(exec);
 368
 369    if (exec->vtx.prim_count &&
 370        exec->vtx.vert_count) {
 371
 372       exec->vtx.copied.nr = vbo_copy_vertices(exec);
 373
 374       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 375          struct gl_context *ctx = exec->ctx;
 376
 377          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 378           * from _mesa_set_varying_vp_inputs().
 379           */
 380          vbo_exec_bind_arrays(ctx);
 381
 382          if (ctx->NewState)
 383             _mesa_update_state(ctx);
 384
 385          vbo_exec_vtx_unmap(exec);
 386
 387          assert(ctx->NewState == 0);
 388
 389          if (0)
 390             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 391                    exec->vtx.vert_count);
 392
 393          ctx->Driver.Draw(ctx, exec->vtx.prim, exec->vtx.prim_count,
 394                           NULL, GL_TRUE, 0, exec->vtx.vert_count - 1,
 395                           NULL, 0, NULL);
 396
 397          /* Get new storage -- unless asked not to. */
 398          if (!keepUnmapped)
 399             vbo_exec_vtx_map(exec);
 400       }
 401    }
 402
 403    /* May have to unmap explicitly if we didn't draw:
 404     */
 405    if (keepUnmapped && exec->vtx.buffer_map) {
 406       vbo_exec_vtx_unmap(exec);
 407    }
 408
 409    if (keepUnmapped || exec->vtx.vertex_size == 0)
 410       exec->vtx.max_vert = 0;
 411    else
 412       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 413
 414    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 415    exec->vtx.prim_count = 0;
 416    exec->vtx.vert_count = 0;
 417 }