Blog Draws Webs Games Miscs

Dev Log: Distortion Shaders

I should be working on this example game for my framework, but instead I'm extending my stay in shader town to try and figure out some other stuff. I managed to get a basic distortion map going which looked like this:

And then after that I played around with my old friends sine and cosine and was able to make a cool animated wave effect on the screen:

Here's the code for the first shader:

uniform sampler2D texture;



uniform sampler2D anothertexture;



void main() {

	

	vec2 coord = gl_TexCoord[0].xy;

	vec4 other_color = texture2D(anothertexture, coord);



	vec4 pixel_color = texture2D(texture, coord + other_color.rg - 0.5);

	vec4 final_color = pixel_color;



	final_color.rgb += other_color.rgb;

	final_color.rgb /= 2;



	gl_FragColor = pixel_color;



}

And the second:

uniform sampler2D texture;



uniform float timer;



void main() {

	vec2 coord = gl_TexCoord[0].xy;

	coord.x += sin(radians(timer + coord.y * 500)) * 0.07;

	coord.y += cos(radians(timer + coord.x * 250)) * 0.03;

	vec4 pixel_color = texture2D(texture, coord);



	gl_FragColor = pixel_color;

}