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#version 450
#extension GL_ARB_separate_shader_objects : enable
layout(location = 0) in vec3 normal;
layout(location = 1) in vec3 fragPos;
layout(location = 0) out vec4 outColor;
float tubeIntegral(const float a, const float b, const float c, const float d, const float t)
{
return (b*(c*t + d) - a*(c + t))/((c*c - d)*sqrt(t*(2*c + t) + d));
}
/* l0: vector to the center of the light from the fragment
* n: normalized surface normal of the fragment
* w: normalized basis vector for the width axis of the light
* halfWidth: half the width of the light
*/
float tubeLight(const vec3 l0, const vec3 n, const vec3 w, const float halfWidth)
{
const float a = dot(n, l0);
const float b = dot(n, w);
const float c = dot(l0, w);
const float d = dot(l0, l0);
const float m = sign(b + max(0.0, a)*max(0.0, b));
const float zeroBound = -a/b;
const float lowerBound = clamp(zeroBound, -halfWidth, halfWidth);
const float upperBound = m*halfWidth;
return m*(tubeIntegral(a, b, c, d, upperBound) - tubeIntegral(a, b, c, d, lowerBound));
}
void main() {
const vec3 lightPos = vec3(1.0, 2.0, -0.0);
const vec3 lightDir = lightPos - fragPos;
//const vec3 lightW = normalize(vec3(1.0, 0.0, 0.0));
const float strength = 4.0;
const float invFalloff = strength/dot(lightDir, lightDir);
outColor = vec4(max(0.0, dot(normalize(normal), normalize(lightDir)))*invFalloff*vec3(1.0), 1.0);
//outColor = vec4(tubeLight(lightDir, normalize(normal), lightW, 5)*fragColor, 1.0);
//outColor.xyz += vec3(0.0625)*fragColor;
//const vec3 viewPos = -fragPos;
//const vec3 halfway = normalize(normalize(lightDir) - normalize(fragPos));
//const float specular = pow(max(0.0, dot(normalize(normal), halfway))*invFalloff, 20.0);
//const float specular = pow(tubeLight(lightDir, halfway, lightW, 5), 100.0);
//outColor = vec4(specular*vec3(1.0), 1.0);
//outColor = vec4(1.0, 1.0, 1.0, 1.0);
}
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