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 static GLuint
  69 vbo_exec_copy_vertices(struct vbo_exec_context *exec)
  70 {
  71    struct _mesa_prim *last_prim = &exec->vtx.prim[exec->vtx.prim_count - 1];
  72    const GLuint sz = exec->vtx.vertex_size;
  73    fi_type *dst = exec->vtx.copied.buffer;
  74    const fi_type *src = exec->vtx.buffer_map + last_prim->start * sz;
  75
  76    return vbo_copy_vertices(exec->ctx, exec->ctx->Driver.CurrentExecPrimitive,
  77                             last_prim, sz, false, dst, src);
  78 }
  79
  80
  81
  82 /* TODO: populate these as the vertex is defined:
  83  */
  84 static void
  85 vbo_exec_bind_arrays(struct gl_context *ctx)
  86 {
  87    struct vbo_context *vbo = vbo_context(ctx);
  88    struct gl_vertex_array_object *vao = vbo->VAO;
  89    struct vbo_exec_context *exec = &vbo->exec;
  90
  91    GLintptr buffer_offset;
  92    if (exec->vtx.bufferobj) {
  93       assert(exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Pointer);
  94       buffer_offset = exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset +
  95                       exec->vtx.buffer_offset;
  96    } else {
  97       /* Ptr into ordinary app memory */
  98       buffer_offset = (GLbyte *)exec->vtx.buffer_map - (GLbyte *)NULL;
  99    }
 100
 101    const gl_vertex_processing_mode mode = ctx->VertexProgram._VPMode;
 102
 103    /* Compute the bitmasks of vao_enabled arrays */
 104    GLbitfield vao_enabled = _vbo_get_vao_enabled_from_vbo(mode, exec->vtx.enabled);
 105
 106    /* At first disable arrays no longer needed */
 107    _mesa_disable_vertex_array_attribs(ctx, vao, VERT_BIT_ALL & ~vao_enabled);
 108    assert((~vao_enabled & vao->Enabled) == 0);
 109
 110    /* Bind the buffer object */
 111    const GLuint stride = exec->vtx.vertex_size*sizeof(GLfloat);
 112    _mesa_bind_vertex_buffer(ctx, vao, 0, exec->vtx.bufferobj, buffer_offset,
 113                             stride, false, false);
 114
 115    /* Retrieve the mapping from VBO_ATTRIB to VERT_ATTRIB space
 116     * Note that the position/generic0 aliasing is done in the VAO.
 117     */
 118    const GLubyte *const vao_to_vbo_map = _vbo_attribute_alias_map[mode];
 119    /* Now set the enabled arrays */
 120    GLbitfield mask = vao_enabled;
 121    while (mask) {
 122       const int vao_attr = u_bit_scan(&mask);
 123       const GLubyte vbo_attr = vao_to_vbo_map[vao_attr];
 124
 125       const GLubyte size = exec->vtx.attr[vbo_attr].size;
 126       const GLenum16 type = exec->vtx.attr[vbo_attr].type;
 127       const GLuint offset = (GLuint)((GLbyte *)exec->vtx.attrptr[vbo_attr] -
 128                                      (GLbyte *)exec->vtx.vertex);
 129       assert(offset <= ctx->Const.MaxVertexAttribRelativeOffset);
 130
 131       /* Set and enable */
 132       _vbo_set_attrib_format(ctx, vao, vao_attr, buffer_offset,
 133                              size, type, offset);
 134
 135       /* The vao is initially created with all bindings set to 0. */
 136       assert(vao->VertexAttrib[vao_attr].BufferBindingIndex == 0);
 137    }
 138    _mesa_enable_vertex_array_attribs(ctx, vao, vao_enabled);
 139    assert(vao_enabled == vao->Enabled);
 140    assert(!exec->vtx.bufferobj ||
 141           (vao_enabled & ~vao->VertexAttribBufferMask) == 0);
 142
 143    _mesa_set_draw_vao(ctx, vao, _vbo_get_vao_filter(mode));
 144 }
 145
 146
 147 /**
 148  * Unmap the VBO.  This is called before drawing.
 149  */
 150 static void
 151 vbo_exec_vtx_unmap(struct vbo_exec_context *exec)
 152 {
 153    if (exec->vtx.bufferobj) {
 154       struct gl_context *ctx = exec->ctx;
 155
 156       if (ctx->Driver.FlushMappedBufferRange &&
 157           !ctx->Extensions.ARB_buffer_storage) {
 158          GLintptr offset = exec->vtx.buffer_used -
 159                            exec->vtx.bufferobj->Mappings[MAP_INTERNAL].Offset;
 160          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 161                              sizeof(float);
 162
 163          if (length)
 164             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
 165                                                exec->vtx.bufferobj,
 166                                                MAP_INTERNAL);
 167       }
 168
 169       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
 170                                 exec->vtx.buffer_map) * sizeof(float);
 171
 172       assert(exec->vtx.buffer_used <= exec->ctx->Const.glBeginEndBufferSize);
 173       assert(exec->vtx.buffer_ptr != NULL);
 174
 175       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj, MAP_INTERNAL);
 176       exec->vtx.buffer_map = NULL;
 177       exec->vtx.buffer_ptr = NULL;
 178       exec->vtx.max_vert = 0;
 179    }
 180 }
 181
 182 static bool
 183 vbo_exec_buffer_has_space(struct vbo_exec_context *exec)
 184 {
 185    return exec->ctx->Const.glBeginEndBufferSize > exec->vtx.buffer_used + 1024;
 186 }
 187
 188
 189 /**
 190  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
 191  */
 192 void
 193 vbo_exec_vtx_map(struct vbo_exec_context *exec)
 194 {
 195    struct gl_context *ctx = exec->ctx;
 196    const GLenum usage = GL_STREAM_DRAW_ARB;
 197    GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
 198                         GL_MAP_UNSYNCHRONIZED_BIT;
 199
 200    if (ctx->Extensions.ARB_buffer_storage) {
 201       /* We sometimes read from the buffer, so map it for read too.
 202        * Only the persistent mapping can do that, because the non-persistent
 203        * mapping uses flags that are incompatible with GL_MAP_READ_BIT.
 204        */
 205       accessRange |= GL_MAP_PERSISTENT_BIT |
 206                      GL_MAP_COHERENT_BIT |
 207                      GL_MAP_READ_BIT;
 208    } else {
 209       accessRange |= GL_MAP_INVALIDATE_RANGE_BIT |
 210                      GL_MAP_FLUSH_EXPLICIT_BIT |
 211                      MESA_MAP_NOWAIT_BIT;
 212    }
 213
 214    if (!exec->vtx.bufferobj)
 215       return;
 216
 217    assert(!exec->vtx.buffer_map);
 218    assert(!exec->vtx.buffer_ptr);
 219
 220    if (vbo_exec_buffer_has_space(exec)) {
 221       /* The VBO exists and there's room for more */
 222       if (exec->vtx.bufferobj->Size > 0) {
 223          exec->vtx.buffer_map = (fi_type *)
 224             ctx->Driver.MapBufferRange(ctx,
 225                                        exec->vtx.buffer_used,
 226                                        ctx->Const.glBeginEndBufferSize
 227                                        - exec->vtx.buffer_used,
 228                                        accessRange,
 229                                        exec->vtx.bufferobj,
 230                                        MAP_INTERNAL);
 231          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 232       }
 233       else {
 234          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
 235       }
 236    }
 237
 238    if (!exec->vtx.buffer_map) {
 239       /* Need to allocate a new VBO */
 240       exec->vtx.buffer_used = 0;
 241
 242       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
 243                                  ctx->Const.glBeginEndBufferSize,
 244                                  NULL, usage,
 245                                  GL_MAP_WRITE_BIT |
 246                                  (ctx->Extensions.ARB_buffer_storage ?
 247                                     GL_MAP_PERSISTENT_BIT |
 248                                     GL_MAP_COHERENT_BIT |
 249                                     GL_MAP_READ_BIT : 0) |
 250                                  GL_DYNAMIC_STORAGE_BIT |
 251                                  GL_CLIENT_STORAGE_BIT,
 252                                  exec->vtx.bufferobj)) {
 253          /* buffer allocation worked, now map the buffer */
 254          exec->vtx.buffer_map =
 255             (fi_type *)ctx->Driver.MapBufferRange(ctx,
 256                                                   0, ctx->Const.glBeginEndBufferSize,
 257                                                   accessRange,
 258                                                   exec->vtx.bufferobj,
 259                                                   MAP_INTERNAL);
 260       }
 261       else {
 262          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
 263          exec->vtx.buffer_map = NULL;
 264       }
 265    }
 266
 267    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 268    exec->vtx.buffer_offset = 0;
 269
 270    if (!exec->vtx.buffer_map) {
 271       /* out of memory */
 272       _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt_noop);
 273    }
 274    else {
 275       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
 276          /* The no-op functions are installed so switch back to regular
 277           * functions.  We do this test just to avoid frequent and needless
 278           * calls to _mesa_install_exec_vtxfmt().
 279           */
 280          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
 281       }
 282    }
 283
 284    if (0)
 285       printf("map %d..\n", exec->vtx.buffer_used);
 286 }
 287
 288
 289
 290 /**
 291  * Execute the buffer and save copied verts.
 292  */
 293 void
 294 vbo_exec_vtx_flush(struct vbo_exec_context *exec)
 295 {
 296    /* Only unmap if persistent mappings are unsupported. */
 297    bool persistent_mapping = exec->ctx->Extensions.ARB_buffer_storage &&
 298                              exec->vtx.bufferobj &&
 299                              exec->vtx.buffer_map;
 300
 301    if (0)
 302       vbo_exec_debug_verts(exec);
 303
 304    if (exec->vtx.prim_count &&
 305        exec->vtx.vert_count) {
 306
 307       exec->vtx.copied.nr = vbo_exec_copy_vertices(exec);
 308
 309       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 310          struct gl_context *ctx = exec->ctx;
 311
 312          /* Prepare and set the exec draws internal VAO for drawing. */
 313          vbo_exec_bind_arrays(ctx);
 314
 315          if (ctx->NewState)
 316             _mesa_update_state(ctx);
 317
 318          if (!persistent_mapping)
 319             vbo_exec_vtx_unmap(exec);
 320
 321          assert(ctx->NewState == 0);
 322
 323          if (0)
 324             printf("%s %d %d\n", __func__, exec->vtx.prim_count,
 325                    exec->vtx.vert_count);
 326
 327          ctx->Driver.Draw(ctx, exec->vtx.prim, exec->vtx.prim_count,
 328                           NULL, GL_TRUE, 0, exec->vtx.vert_count - 1, 1, 0,
 329                           NULL, 0);
 330
 331          /* Get new storage -- unless asked not to. */
 332          if (!persistent_mapping)
 333             vbo_exec_vtx_map(exec);
 334       }
 335    }
 336
 337    if (persistent_mapping) {
 338       exec->vtx.buffer_used += (exec->vtx.buffer_ptr - exec->vtx.buffer_map) *
 339                                sizeof(float);
 340       exec->vtx.buffer_map = exec->vtx.buffer_ptr;
 341
 342       /* Set the buffer offset for the next draw. */
 343       exec->vtx.buffer_offset = exec->vtx.buffer_used;
 344
 345       if (!vbo_exec_buffer_has_space(exec)) {
 346          /* This will allocate a new buffer. */
 347          vbo_exec_vtx_unmap(exec);
 348          vbo_exec_vtx_map(exec);
 349       }
 350    }
 351
 352    if (exec->vtx.vertex_size == 0)
 353       exec->vtx.max_vert = 0;
 354    else
 355       exec->vtx.max_vert = vbo_compute_max_verts(exec);
 356
 357    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
 358    exec->vtx.prim_count = 0;
 359    exec->vtx.vert_count = 0;
 360 }