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blur-effect: Use the texture size to work out the x/y step

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The blur effect needs to pass a uniform to the GLSL shader so that it
can know the texture coordinate offset from one texel to another. To
calculate this the blur effect was previously using the allocation
size of the actor rounded up to the next power of two. Presumably the
assumption was that Cogl would round up the size of the texture to the
next power of two when allocating the texture. However this is not be
true if the driver supports NPOT textures. Also it doesn't take into
account the paint volume of the actor which may cause the texture to
be a completely different size. This patch just changes to directly
use the size of the texture.

Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Neil Roberts 2012-02-13 15:11:44 +00:00
parent 041ac40056
commit b4887c3699
1 changed files with 15 additions and 26 deletions
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33
clutter/clutter-blur-effect.c
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@ -85,12 +85,6 @@ struct _ClutterBlurEffect
/* a back pointer to our actor, so that we can query it */
ClutterActor *actor;
/* the parameters; x_step and y_step depend on
* the actor's allocation
*/
gfloat x_step;
gfloat y_step;
CoglHandle shader;
CoglHandle program;
@ -110,17 +104,6 @@ G_DEFINE_TYPE (ClutterBlurEffect,
clutter_blur_effect,
CLUTTER_TYPE_OFFSCREEN_EFFECT);
static int
next_p2 (int a)
{
int rval = 1;
while (rval < a)
rval <<= 1;
return rval;
}
static gboolean
clutter_blur_effect_pre_paint (ClutterEffect *effect)
{
@ -151,9 +134,6 @@ clutter_blur_effect_pre_paint (ClutterEffect *effect)
clutter_actor_get_allocation_box (self->actor, &allocation);
clutter_actor_box_get_size (&allocation, &width, &height);
self->x_step = 1.0f / (float) next_p2 (width);
self->y_step = 1.0f / (float) next_p2 (height);
if (self->shader == COGL_INVALID_HANDLE)
{
self->shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
@ -216,22 +196,31 @@ clutter_blur_effect_paint_target (ClutterOffscreenEffect *effect)
ClutterBlurEffect *self = CLUTTER_BLUR_EFFECT (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
CoglHandle texture;
if (self->program == COGL_INVALID_HANDLE)
goto out;
texture = clutter_offscreen_effect_get_texture (effect);
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
if (self->x_step_uniform > -1)
{
int width = cogl_texture_get_width (texture);
cogl_program_set_uniform_1f (self->program,
self->x_step_uniform,
self->x_step);
1.0f / width);
}
if (self->y_step_uniform > -1)
{
int height = cogl_texture_get_height (texture);
cogl_program_set_uniform_1f (self->program,
self->y_step_uniform,
self->y_step);
1.0f / height);
}
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);