Beginner Problem on Shaders

[Neihra]

Hey all !

I'm quite new about using shaders and i know that my problem is really simple but i can't find how to use my shader... I think that tere is something i didn't understand.

Here is my shader:



I can apply it to the application_surface:

And it gives me that:

But when i try to apply only on the liquid (the linked sprite is the liquid (or potion as you want)):

And it gives me that:

Any idea?

 

[Neihra]

Well Okay i failed here are the linked screen in the order:

 

[Neihra]

Sorry for spamming -_-"

 

[basement ape]

You'll probably get more help if you post the code as text and not images. Otherwise people will have to type it out themselves just to be able to test it

 

[Neihra]

I think i'm tired x)

Shader:

varying vec2 v_vTexcoord;
varying vec4 v_vColour;

varying vec2 fragCoord;

uniform vec3      iResolution;           // viewport resolution (in pixels)
uniform float     iTime;                 // shader playback time (in seconds)

void main()
{

vec2 uv = fragCoord.xy / iResolution.xy;

float w = (0.5 - (uv.x)) * (iResolution.x / iResolution.y);
    float h = 0.5 - uv.y;
float distanceFromCenter = sqrt(w * w + h * h);

float sinArg = distanceFromCenter * 100.0 - iTime * 10.0;
float slope = cos(sinArg) ;
vec4 colors = texture2D(gm_BaseTexture, uv + normalize(vec2(w, h)) * slope * 0.02);

gl_FragColor = colors;

}

Create event:

application_surface_draw_enable(false);

u_resolution = shader_get_uniform(sha_test, "iResolution");

u_time = shader_get_uniform(sha_test, "iTime");

sec = 0;

Step event:

sec += 1/60;

Post Draw event:

shader_set(sha_test);

shader_set_uniform_f(u_resolution, room_width, room_height);

shader_set_uniform_f(u_time, sec);

draw_self();

shader_reset();