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#version 330 core
// Uniforms for shape information
//in vec3 worldSpace_pos;
//in vec3 worldSpace_norm;
in float visibility;
in vec4 clipSpace;
in vec2 tex_coord;
in vec3 toCameraVector;
// Camera uniform
uniform vec3 worldSpace_camPos;
uniform sampler2D reflect_texture;
uniform sampler2D refract_texture;
uniform sampler2D du_dv_map;
uniform float moveFactor; // offset that changes over time
out vec4 fragColor;
const float distortionStrength = .02f;
const vec4 waterColor = vec4(.06f, .49f, .59f, 1.f);
uniform vec3 skyColor;
void main() {
// screen space coords
vec2 ndc = (clipSpace.xy/clipSpace.w)/2.f + .5f;
vec2 refractTexCoords = ndc;
vec2 reflectTexCoords = vec2(ndc.x, ndc.y);
// get associated rg color in the range -1,1 from du_dv map
vec2 distortion1 = (texture(du_dv_map, vec2(tex_coord.x + moveFactor, tex_coord.y)).rg*2.f - 1.f) * distortionStrength;
vec2 distortion2 = (texture(du_dv_map, vec2(-tex_coord.x + moveFactor, tex_coord.y + moveFactor)).rg*2.f - 1.f) * distortionStrength;
vec2 totalDistortion = distortion1 + distortion2;
refractTexCoords += totalDistortion;
reflectTexCoords += totalDistortion;
refractTexCoords = clamp(refractTexCoords, 0.001f, .999f);
reflectTexCoords = clamp(reflectTexCoords, 0.001f, .999f);
// fresnel effect
vec3 viewVector = normalize(toCameraVector);
float refractiveFactor = dot(viewVector, vec3(0.f, 1.f, 0.f));
refractiveFactor = pow(refractiveFactor, 5.f); // changes how reflective water is
vec4 reflect = texture(reflect_texture, reflectTexCoords);
vec4 refract = texture(refract_texture, refractTexCoords);
// mix actual color with fog color
fragColor = mix(reflect, refract, refractiveFactor);
fragColor = mix(fragColor, waterColor, .2f);
fragColor = mix(vec4(skyColor, 1.f), fragColor, visibility);
}
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