32 lines
1 KiB
GLSL
32 lines
1 KiB
GLSL
// Based on work by David Li(http://david.li/waves)
|
|
#version 450
|
|
|
|
#ifdef GL_ES
|
|
precision mediump float;
|
|
#endif
|
|
|
|
in vec2 texCoord;
|
|
out vec4 fragColor;
|
|
|
|
uniform sampler2D texDisplacement;
|
|
const float resolution = 512.0;
|
|
const float size = 250.0;
|
|
|
|
void main() {
|
|
float texel = 1.0 / resolution;
|
|
float texelSize = size / resolution;
|
|
|
|
vec3 center = texture(texDisplacement, texCoord).rgb;
|
|
vec3 right = vec3(texelSize, 0.0, 0.0) + texture(texDisplacement, texCoord + vec2(texel, 0.0)).rgb - center;
|
|
vec3 left = vec3(-texelSize, 0.0, 0.0) + texture(texDisplacement, texCoord + vec2(-texel, 0.0)).rgb - center;
|
|
vec3 top = vec3(0.0, 0.0, -texelSize) + texture(texDisplacement, texCoord + vec2(0.0, -texel)).rgb - center;
|
|
vec3 bottom = vec3(0.0, 0.0, texelSize) + texture(texDisplacement, texCoord + vec2(0.0, texel)).rgb - center;
|
|
|
|
vec3 topRight = cross(right, top);
|
|
vec3 topLeft = cross(top, left);
|
|
vec3 bottomLeft = cross(left, bottom);
|
|
vec3 bottomRight = cross(bottom, right);
|
|
|
|
fragColor = vec4(normalize(topRight + topLeft + bottomLeft + bottomRight), 1.0);
|
|
}
|