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[journal] Don't resize a singlton VBO; create and destroy a VBO each flush

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This simplifies the vertex data uploading in the journal, and could improve
performance.  Modifying a VBO mid-scene could reqire synchronizing with the
GPU or some form of shadowing/copying to avoid modifying data that the GPU
is currently processing; the buffer was also being marked as GL_STATIC_DRAW
which could have made things worse.

Now we simply create a GL_STATIC_DRAW VBO for each flush and and delete it
when we are finished.
This commit is contained in:
Robert Bragg 2009-06-22 00:11:41 +01:00
parent 1ecfd72936
commit a7974f8e6f
1 changed files with 12 additions and 28 deletions
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28
common/cogl-primitives.c
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@ -473,10 +473,6 @@ _cogl_journal_flush_vbo_offsets_and_entries (CoglJournalEntry *batch_start,
_cogl_journal_flush_texcoord_vbo_offsets_and_entries,
data);
#ifndef HAVE_COGL_GL
GE (glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0));
#endif
/* progress forward through the VBO containing all our vertices */
state->vbo_offset += (stride * 4 * batch_len);
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_JOURNAL))
@ -507,30 +503,15 @@ upload_vertices_to_vbo (GArray *vertices, CoglJournalFlushState *state)
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
needed_vbo_len = vertices->len * sizeof (GLfloat);
if (ctx->journal_vbo_len < needed_vbo_len)
{
GE (glDeleteBuffers (1, &ctx->journal_vbo));
g_assert (ctx->journal_vbo == 0);
g_assert (needed_vbo_len);
GE (glGenBuffers (1, &ctx->journal_vbo));
GE (glBindBuffer (GL_ARRAY_BUFFER, ctx->journal_vbo));
GE (glBufferData (GL_ARRAY_BUFFER,
needed_vbo_len,
vertices->data,
GL_STATIC_DRAW));
ctx->journal_vbo_len = needed_vbo_len;
}
else
{
GE (glBindBuffer (GL_ARRAY_BUFFER, ctx->journal_vbo));
GE (glBufferData (GL_ARRAY_BUFFER,
needed_vbo_len,
NULL,
GL_STATIC_DRAW));
GE (glBufferSubData (GL_ARRAY_BUFFER,
0,
needed_vbo_len,
vertices->data));
}
/* As we flush the journal entries in batches we walk forward through the
* above VBO starting at offset 0... */
@ -613,7 +594,10 @@ _cogl_journal_flush (void)
}
if (!vbo_fallback)
GE (glBindBuffer (GL_ARRAY_BUFFER, 0));
{
GE (glDeleteBuffers (1, &ctx->journal_vbo));
ctx->journal_vbo = 0;
}
g_array_set_size (ctx->journal, 0);
g_array_set_size (ctx->logged_vertices, 0);