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glamor_render: Don't allocate buffer for vbo each time.

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We can reuse the last one if the last one is big enough
to contain current vertext data. In the meantime, Use
MapBufferRange instead of MapBuffer.

Testing shows, this patch brings some benefit for
aa10text/rgb10text. Not too much, but indeed faster.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>
This commit is contained in:
Zhigang Gong 2012-06-26 15:39:24 +08:00 committed by Eric Anholt
parent 682f5d2989
commit 3873d412f0
1 changed files with 16 additions and 5 deletions
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21
glamor/glamor_render.c
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@ -724,10 +724,17 @@ glamor_setup_composite_vbo(ScreenPtr screen, int n_verts)
glamor_screen_private *glamor_priv =
glamor_get_screen_private(screen);
glamor_gl_dispatch *dispatch;
int vert_size;
Bool need_new_buffer = FALSE;
glamor_priv->vbo_offset = 0;
glamor_priv->render_nr_verts = 0;
glamor_priv->vbo_size = n_verts * sizeof(float) * 2;
vert_size = n_verts * sizeof(float) * 2;
if (glamor_priv->vbo_size < vert_size) {
glamor_priv->vbo_size = vert_size;
need_new_buffer = TRUE;
}
glamor_priv->vb_stride = 2 * sizeof(float);
if (glamor_priv->has_source_coords)
@ -738,10 +745,14 @@ glamor_setup_composite_vbo(ScreenPtr screen, int n_verts)
dispatch = glamor_get_dispatch(glamor_priv);
dispatch->glBindBuffer(GL_ARRAY_BUFFER, glamor_priv->vbo);
if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP) {
dispatch->glBufferData(GL_ARRAY_BUFFER,
n_verts * sizeof(float) * 2,
NULL, GL_DYNAMIC_DRAW);
glamor_priv->vb = dispatch->glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
if (need_new_buffer)
dispatch->glBufferData(GL_ARRAY_BUFFER,
vert_size,
NULL, GL_DYNAMIC_DRAW);
glamor_priv->vb = dispatch->glMapBufferRange(GL_ARRAY_BUFFER, 0,
vert_size,
GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
assert(glamor_priv->vb != NULL);
}
dispatch->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, glamor_priv->ebo);