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%s %d..%d %s %s\n",
  58              i,
  59              _mesa_lookup_prim_by_nr(prim->mode),
  60              prim->weak ? " (weak)" : "",
  61              prim->start,
  62              prim->start + prim->count,
  63              prim->begin ? "BEGIN" : "(wrap)",
  64              prim->end ? "END" : "(wrap)");
  65    }
  66 }
  67
  68
  69 /**
  70  * Copy zero, one or two vertices from the current vertex buffer into
  71  * the temporary "copy" buffer.
  72  * This is used when a single primitive overflows a vertex buffer and
  73  * we need to continue the primitive in a new vertex buffer.
  74  * The temporary "copy" buffer holds the vertices which need to get
  75  * copied from the old buffer to the new one.
  76  */
  77 static GLuint
  78 vbo_copy_vertices(struct vbo_exec_context *exec)
  79 {
  80    struct _mesa_prim *last_prim = &exec->vtx.prim[exec->vtx.prim_count - 1];
  81    const GLuint nr = last_prim->count;
  82    GLuint ovf, i;
  83    const GLuint sz = exec->vtx.vertex_size;
  84    fi_type *dst = exec->vtx.copied.buffer;
  85    const fi_type *src = exec->vtx.buffer_map + last_prim->start * sz;
  86
  87    switch (exec->ctx->Driver.CurrentExecPrimitive) {
  88    case GL_POINTS:
  89       return 0;
  90    case GL_LINES:
  91       ovf = nr&1;
  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_TRIANGLES:
  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_QUADS:
 101       ovf = nr&3;
 102       for (i = 0 ; i < ovf ; i++)
 103          memcpy(dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat));
 104       return i;
 105    case GL_LINE_STRIP:
 106       if (nr == 0) {
 107          return 0;
 108       }
 109       else {
 110          memcpy(dst, src+(nr-1)*sz, sz * sizeof(GLfloat));
 111          return 1;
 112       }
 113    case GL_LINE_LOOP:
 114       if (last_prim->begin == 0) {
 115          /* We're dealing with the second or later section of a split/wrapped
 116           * GL_LINE_LOOP.  Since we're converting line loops to line strips,
 117           * we've already increment the last_prim->start counter by one to
 118           * skip the 0th vertex in the loop.  We need to undo that (effectively
 119           * subtract one from last_prim->start) so that we copy the 0th vertex
 120           * to the next vertex buffer.
 121           */
 122          assert(last_prim->start > 0);
 123          src -= sz;
 124       }
 125       /* fall-through */
 126    case GL_TRIANGLE_FAN:
 127    case GL_POLYGON:
 128       if (nr == 0) {
 129          return 0;
 130       }
 131       else if (nr == 1) {
 132          memcpy(dst, src+0, sz * sizeof(GLfloat));
 133          return 1;
 134       }
 135       else {
 136          memcpy(dst, src+0, sz * sizeof(GLfloat));
 137          memcpy(dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat));
 138          return 2;
 139       }
 140    case GL_TRIANGLE_STRIP:
 141       /* no parity issue, but need to make sure the tri is not drawn twice */
 142       if (nr & 1) {
 143          last_prim->count--;
 144       }
 145       /* fallthrough */
 146    case GL_QUAD_STRIP:
 147       switch (nr) {
 148       case 0:
 149          ovf = 0;
 150          break;
 151       case 1:
 152          ovf = 1;
 153          break;
 154       default:
 155          ovf = 2 + (nr & 1);
 156          break;
 157       }
 158       for (i = 0 ; i < ovf ; i++)
 159          memcpy(dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat));
 160       return i;
 161    case PRIM_OUTSIDE_BEGIN_END:
 162       return 0;
 163    default:
 164       unreachable("Unexpected primitive type");
 165       return 0;
 166    }
 167 }
 168
 169
 170
 171 /* TODO: populate these as the vertex is defined:
 172  */
 173 static void
 174 vbo_exec_bind_arrays(struct gl_context *ctx)
 175 {
 176    struct vbo_context *vbo = vbo_context(ctx);
 177    struct gl_vertex_array_object *vao = vbo->VAO;
 178    struct vbo_exec_context *exec = &vbo->exec;
 179
 180    GLintptr buffer_offset;
 181    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 182       assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
 183       buffer_offset = exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 184    } else {
 185       /* Ptr into ordinary app memory */
 186       buffer_offset = (GLbyte *)exec->vtx.buffer_map - (GLbyte *)NULL;
 187    }
 188
 189    const gl_vertex_processing_mode mode = ctx->VertexProgram._VPMode;
 190
 191    /* Compute the bitmasks of vao_enabled arrays */
 192    GLbitfield vao_enabled = _vbo_get_vao_enabled_from_vbo(mode, exec->vtx.enabled);
 193
 194    /* At first disable arrays no longer needed */
 195    GLbitfield mask = vao->_Enabled & ~vao_enabled;
 196    while (mask) {
 197       const int vao_attr = u_bit_scan(&mask);
 198       _mesa_disable_vertex_array_attrib(ctx, vao, vao_attr);
 199    }
 200    assert((~vao_enabled & vao->_Enabled) == 0);
 201
 202    /* Bind the buffer object */
 203    const GLuint stride = exec->vtx.vertex_size*sizeof(GLfloat);
 204    assert(stride <= ctx->Const.MaxVertexAttribStride);
 205    _mesa_bind_vertex_buffer(ctx, vao, 0, exec->vtx.bufferobj, buffer_offset,
 206                             stride);
 207
 208    /* Retrieve the mapping from VBO_ATTRIB to VERT_ATTRIB space
 209     * Note that the position/generic0 aliasing is done in the VAO.
 210     */
 211    const GLubyte *const vao_to_vbo_map = _vbo_attribute_alias_map[mode];
 212    /* Now set the enabled arrays */
 213    mask = vao_enabled;
 214    while (mask) {
 215       const int vao_attr = u_bit_scan(&mask);
 216       const GLubyte vbo_attr = vao_to_vbo_map[vao_attr];
 217
 218       const GLubyte size = exec->vtx.attrsz[vbo_attr];
 219       const GLenum16 type = exec->vtx.attrtype[vbo_attr];
 220       const GLuint offset = (GLuint)((GLbyte *)exec->vtx.attrptr[vbo_attr] -
 221                                      (GLbyte *)exec->vtx.vertex);
 222       assert(offset <= ctx->Const.MaxVertexAttribRelativeOffset);
 223
 224       /* Set and enable */
 225       _vbo_set_attrib_format(ctx, vao, vao_attr, buffer_offset,
 226                              size, type, offset);
 227       if ((vao->_Enabled & VERT_BIT(vao_attr)) == 0)
 228          _mesa_enable_vertex_array_attrib(ctx, vao, vao_attr);
 229
 230       /* The vao is initially created with all bindings set to 0. */
 231       assert(vao->VertexAttrib[vao_attr].BufferBindingIndex == 0);
 232    }
 233    assert(vao_enabled == vao->_Enabled);
 234    assert(!_mesa_is_bufferobj(exec->vtx.bufferobj) ||
 235           (vao_enabled & ~vao->VertexAttribBufferMask) == 0);
 236
 237    _mesa_set_draw_vao(ctx, vao, _vbo_get_vao_filter(mode));
 238 }
 239
 240
 241 /**
 242  * Unmap the VBO.  This is called before drawing.
 243  */
 244 static void
 245 vbo_exec_vtx_unmap(struct vbo_exec_context *exec)
 246 {
 247    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
 248       struct gl_context *ctx = exec->ctx;
 249
 250       if (ctx->Driver.FlushMappedBufferRange) {
 251          GLintptr offset = exec->vtx.buffer_used -
 252                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 253          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 254                              sizeof(float);
 255
 256          if (length)
 257             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 258                                                exec->vtx.bufferobj,
 259                                                MAP_INTERNAL);
 260       }
 261
 262       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 263                                 exec->vtx.buffer_map) * sizeof(float);
 264
 265       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
 266       assert(exec->vtx.buffer_ptr != NULL);
 267
 268       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 269       exec->vtx.buffer_map = NULL;
 270       exec->vtx.buffer_ptr = NULL;
 271       exec->vtx.max_vert = 0;
 272    }
 273 }
 274
 275
 276 /**
 277  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 278  */
 279 void
 280 vbo_exec_vtx_map(struct vbo_exec_context *exec)
 281 {
 282    struct gl_context *ctx = exec->ctx;
 283    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 284                               GL_MAP_INVALIDATE_RANGE_BIT |
 285                               GL_MAP_UNSYNCHRONIZED_BIT |
 286                               GL_MAP_FLUSH_EXPLICIT_BIT |
 287                               MESA_MAP_NOWAIT_BIT;
 288    const GLenum usage = GL_STREAM_DRAW_ARB;
 289
 290    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
 291       return;
 292
 293    assert(!exec->vtx.buffer_map);
 294    assert(!exec->vtx.buffer_ptr);
 295
 296    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
 297       /* The VBO exists and there's room for more */
 298       if (exec->vtx.bufferobj->Size > 0) {
 299          exec->vtx.buffer_map = (fi_type *)
 300             ctx->Driver.MapBufferRange(ctx,
 301                                        exec->vtx.buffer_used,
 302                                        VBO_VERT_BUFFER_SIZE
 303                                        - exec->vtx.buffer_used,
 304                                        accessRange,
 305                                        exec->vtx.bufferobj,
 306                                        MAP_INTERNAL);
 307          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 308       }
 309       else {
 310          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 311       }
 312    }
 313
 314    if (!exec->vtx.buffer_map) {
 315       /* Need to allocate a new VBO */
 316       exec->vtx.buffer_used = 0;
 317
 318       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 319                                  VBO_VERT_BUFFER_SIZE,
 320                                  NULL, usage,
 321                                  GL_MAP_WRITE_BIT |
 322                                  GL_DYNAMIC_STORAGE_BIT |
 323                                  GL_CLIENT_STORAGE_BIT,
 324                                  exec->vtx.bufferobj)) {
 325          /* buffer allocation worked, now map the buffer */
 326          exec->vtx.buffer_map =
 327             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 328                                                   0, VBO_VERT_BUFFER_SIZE,
 329                                                   accessRange,
 330                                                   exec->vtx.bufferobj,
 331                                                   MAP_INTERNAL);
 332       }
 333       else {
 334          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 335          exec->vtx.buffer_map = NULL;
 336       }
 337    }
 338
 339    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 340
 341    if (!exec->vtx.buffer_map) {
 342       /* out of memory */
 343       _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt_noop);
 344    }
 345    else {
 346       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 347          /* The no-op functions are installed so switch back to regular
 348           * functions.  We do this test just to avoid frequent and needless
 349           * calls to _mesa_install_exec_vtxfmt().
 350           */
 351          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 352       }
 353    }
 354
 355    if (0)
 356       printf("map %d..\n", exec->vtx.buffer_used);
 357 }
 358
 359
 360
 361 /**
 362  * Execute the buffer and save copied verts.
 363  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
 364  */
 365 void
 366 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 367 {
 368    if (0)
 369       vbo_exec_debug_verts(exec);
 370
 371    if (exec->vtx.prim_count &&
 372        exec->vtx.vert_count) {
 373
 374       exec->vtx.copied.nr = vbo_copy_vertices(exec);
 375
 376       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 377          struct gl_context *ctx = exec->ctx;
 378
 379          /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
 380           * from _mesa_set_varying_vp_inputs().
 381           */
 382          vbo_exec_bind_arrays(ctx);
 383
 384          if (ctx->NewState)
 385             _mesa_update_state(ctx);
 386
 387          vbo_exec_vtx_unmap(exec);
 388
 389          assert(ctx->NewState == 0);
 390
 391          if (0)
 392             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 393                    exec->vtx.vert_count);
 394
 395          ctx->Driver.Draw(ctx, exec->vtx.prim, exec->vtx.prim_count,
 396                           NULL, GL_TRUE, 0, exec->vtx.vert_count - 1,
 397                           NULL, 0, NULL);
 398
 399          /* Get new storage -- unless asked not to. */
 400          if (!keepUnmapped)
 401             vbo_exec_vtx_map(exec);
 402       }
 403    }
 404
 405    /* May have to unmap explicitly if we didn't draw:
 406     */
 407    if (keepUnmapped && exec->vtx.buffer_map) {
 408       vbo_exec_vtx_unmap(exec);
 409    }
 410
 411    if (keepUnmapped || exec->vtx.vertex_size == 0)
 412       exec->vtx.max_vert = 0;
 413    else
 414       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 415
 416    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 417    exec->vtx.prim_count = 0;
 418    exec->vtx.vert_count = 0;
 419 }