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#version 330 core
in vec2 constants;
in vec2 dir;
in vec2 tex;
in vec3 pos;
uniform float time;
uniform float phaseC; // phase constant
uniform sampler2D halftone_texture;
uniform sampler2D foam_texture;
uniform vec2 widthBounds;
uniform vec2 lengthBounds;
out vec4 fragColor;
float getSaturation(vec2 k, vec2 xzPos, float adjWaveLength, float phaseC){
//k = normalize(k);
float result = dot(k, xzPos) * 3.14f / adjWaveLength;
result = result + phaseC*time*.5f;
result = -tan(result + 1.57f);
result = exp(result) / 100.f;
return result;
}
void main() {
float height = pos.y;
float saturation = getSaturation(dir, vec2(pos.x,pos.z), 100.f, constants[0]);
vec4 m_uv = texture(halftone_texture, tex);
float m_threshold = m_uv.r * m_uv.g * m_uv.b;
// final rgba color at x,z pos
vec4 h = vec4(0,0,1,1);
if (saturation > m_threshold) h = vec4(1,1,1, 1);
// add fading effect to bubble popping
vec4 g = clamp(.5*saturation - m_threshold, 0, 1) * h;
// apply foam texture
vec4 foam = texture(foam_texture, tex*.3);
vec4 j = vec4(vec3(g*foam), 1);
//if (saturation > m_threshold) j = vec4(vec3(g*foam), 1);
fragColor = vec4(j);
}
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