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cogl: Cache the value for GL_MAX_TEXTURE_UNITS

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The function _cogl_get_max_texture_units is called quite often while
rendering and it returns a constant value so we might as well cache
the result. Calling glGetInteger on Mesa can be expensive because it
flushes a lot of state.
This commit is contained in:
Neil Roberts 2010-02-12 14:26:33 +00:00
parent e48b817b0a
commit fbe9e80a07
3 changed files with 15 additions and 3 deletions
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2
cogl/cogl-context.c
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@ -152,6 +152,8 @@ cogl_create_context (void)
_context->current_pbo = NULL;
_context->max_texture_units = -1;
return TRUE;
}

4
cogl/cogl-context.h
View File

@ -126,6 +126,10 @@ typedef struct
chances of getting the same colour during an animation */
guint8 journal_rectangles_color;
/* Cached value for GL_MAX_TEXTURE_UNITS to avoid calling
glGetInteger too often */
GLint max_texture_units;
CoglContextDriver drv;
} CoglContext;

12
cogl/cogl.c
View File

@ -854,11 +854,17 @@ _cogl_destroy_texture_units (void)
unsigned int
_cogl_get_max_texture_image_units (void)
{
GLint nb_texture_image_units;
_COGL_GET_CONTEXT (ctx, 0);
GE( glGetIntegerv(GL_MAX_TEXTURE_UNITS, &nb_texture_image_units) );
/* This function is called quite often so we cache the value to
avoid too many GL calls */
if (ctx->max_texture_units == -1)
{
ctx->max_texture_units = 1;
GE( glGetIntegerv (GL_MAX_TEXTURE_UNITS, &ctx->max_texture_units) );
}
return nb_texture_image_units;
return ctx->max_texture_units;
}
void