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attributes: optimize validation of tex_coord%d_in names

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This avoids using sscanf to determine the texture_unit that a
tex_coord%d_in attribute name corresponds to since that was showing high
on profiles. Instead once we know we have a "tex_coord" name then we
can simply use strtoul which is much cheaper and use the returned endptr
we get to verify we have a "_in" suffix after the number.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2011-09-20 19:56:55 +01:00
parent d739892a5c
commit 77a7add50e
1 changed files with 4 additions and 1 deletions
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5
cogl/cogl-attribute.c
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@ -47,6 +47,7 @@
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
/* This isn't defined in the GLES headers */
#ifndef GL_UNSIGNED_INT
@ -163,7 +164,9 @@ validate_cogl_attribute (const char *name,
*name_id = COGL_ATTRIBUTE_NAME_ID_TEXTURE_COORD_ARRAY;
else if (strncmp (name, "tex_coord", strlen ("tex_coord")) == 0)
{
if (sscanf (name, "tex_coord%u_in", texture_unit) != 1)
char *endptr;
*texture_unit = strtoul (name + 9, &endptr, 10);
if (strcmp (endptr, "_in") != 0)
{
g_warning ("Texture coordinate attributes should either be named "
"\"cogl_tex_coord\" or named with a texture unit index "