Dear all,
I'm using clutter 1.2 with OpenGLES 2.0 as backend on a linux based ARM
(freescale iMX51) embedded system and would like to use some shaders.
Unfortunately I encountered some problems and really strange behavior.
I'm using the following code, which I think is pretty basic and in my
understanding should work:
#define FRAG_SHADER \
"void main(void) { gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0);}"
int main (int argc, char *argv[])
{
ClutterActor *stage;
ClutterActor *rect;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
rect = clutter_rectangle_new_with_color(clutter_color_new(255,0,0,255));
clutter_actor_set_size(rect, 300,300);
clutter_container_add (CLUTTER_CONTAINER(stage), rect, NULL);
ClutterActor *tex = clutter_texture_new_from_file ("redhand.png", NULL);
ClutterShader *shader = clutter_shader_new();
clutter_shader_set_fragment_source(shader, FRAG_SHADER, strlen(FRAG_SHADER));
// clutter_shader_compile(shader, NULL);
if (clutter_actor_set_shader(tex, shader)) g_print("shader applied\n");
clutter_container_add (CLUTTER_CONTAINER (stage), tex, NULL);
clutter_actor_show_all (CLUTTER_ACTOR (stage));
clutter_main();
return EXIT_SUCCESS;
}
Now, if I execute this little piece of code, i get the following result:
- the texture to which the shader should be applied (tex) remains unchanged
- the rectangle which should be red is blue, which i guess means, the shader
gets applied to the rectangle.
If I use two rectangles instead of "one texture and one rectangle" and apply
the shader to a rectangle, the shader has no effect at all.
It even gets stranger: if I execute this example with debug outputs enabled
(e.g. "./shader_test --clutter-debug=shader or "--clutter-debug=actor") i get a
critical error in the method "cogl_gles2_wrapper_get_program", BUT if i execute
the program with "--clutter-debug=all" or no debug output I get the same
behavior as described above without any errors.
I would really appreciate it if somebody has some hints, why I get this strange
behavior.
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