mirror of
https://github.com/bailwillharr/engine.git
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71 lines
2.0 KiB
GLSL
71 lines
2.0 KiB
GLSL
#version 450
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layout(location = 0) in vec3 fragPos;
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layout(location = 1) in vec3 fragNorm;
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layout(location = 2) in vec2 fragUV;
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layout(location = 3) in vec3 fragLightPos;
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layout(location = 4) in vec3 fragColor;
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layout(location = 0) out vec4 outColor;
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float snoise(vec2 v);
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void main() {
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// constants
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vec3 lightColor = vec3(1.0, 1.0, 1.0);
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vec3 ambientColor = vec3(1.0, 1.0, 1.0);
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float ambientStrength = 0.1;
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vec3 baseColor = vec3(fragColor.x * snoise(fragUV * 10.0), mod(fragUV.x, 1.0), mod(fragUV.y, 1.0));
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vec3 emission = vec3(0.0, 0.0, 0.0);
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// code
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vec3 norm = normalize(fragNorm);
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vec3 lightDir = normalize(fragLightPos - fragPos);
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vec3 diffuse = max(dot(norm, lightDir), 0.0) * lightColor;
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vec3 ambient = ambientColor * ambientStrength;
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vec3 viewDir = normalize(-fragPos);
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vec3 reflectDir = reflect(-lightDir, norm);
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float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
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vec3 specular = 0.5 * spec * lightColor;
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vec3 lighting = min(diffuse + ambient + specular, 1.0);
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outColor = min( ( vec4(baseColor, 1.0) ) * vec4(lighting + emission, 1.0), vec4(1.0));
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}
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// Simplex 2D noise
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//
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vec3 permute(vec3 x) { return mod(((x*34.0)+1.0)*x, 289.0); }
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float snoise(vec2 v){
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const vec4 C = vec4(0.211324865405187, 0.366025403784439,
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-0.577350269189626, 0.024390243902439);
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vec2 i = floor(v + dot(v, C.yy) );
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vec2 x0 = v - i + dot(i, C.xx);
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vec2 i1;
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i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
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vec4 x12 = x0.xyxy + C.xxzz;
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x12.xy -= i1;
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i = mod(i, 289.0);
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vec3 p = permute( permute( i.y + vec3(0.0, i1.y, 1.0 ))
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+ i.x + vec3(0.0, i1.x, 1.0 ));
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vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy),
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dot(x12.zw,x12.zw)), 0.0);
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m = m*m ;
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m = m*m ;
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vec3 x = 2.0 * fract(p * C.www) - 1.0;
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vec3 h = abs(x) - 0.5;
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vec3 ox = floor(x + 0.5);
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vec3 a0 = x - ox;
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m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h );
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vec3 g;
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g.x = a0.x * x0.x + h.x * x0.y;
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g.yz = a0.yz * x12.xz + h.yz * x12.yw;
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return 130.0 * dot(m, g);
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} |