70 lines
2.1 KiB
GLSL
70 lines
2.1 KiB
GLSL
#version 330
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// Entrées (de Raylib)
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in vec2 fragTexCoord;
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in vec4 fragColor;
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out vec4 finalColor;
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uniform vec2 center;
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uniform float screenHeight;
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uniform vec2 resolution;
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uniform float d1;
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uniform float d2;
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uniform float lambda;
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uniform float angleM1;
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uniform float zoom;
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const float PI = 3.14159265359;
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vec3 WavelengthToRGB(float l) {
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float r = 0.0; float g = 0.0; float b = 0.0;
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if (l >= 380.0 && l < 440.0) { r = -(l - 440.0) / (440.0 - 380.0); b = 1.0; }
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else if (l >= 440.0 && l < 490.0) { g = (l - 440.0) / (490.0 - 440.0); b = 1.0; }
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else if (l >= 490.0 && l < 510.0) { g = 1.0; b = -(l - 510.0) / (510.0 - 490.0); }
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else if (l >= 510.0 && l < 580.0) { r = (l - 510.0) / (580.0 - 510.0); g = 1.0; }
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else if (l >= 580.0 && l < 645.0) { r = 1.0; g = -(l - 645.0) / (645.0 - 580.0); }
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else if (l >= 645.0 && l <= 780.0) { r = 1.0; }
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float factor = 1.0;
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if (l >= 380.0 && l < 420.0) factor = 0.3 + 0.7 * (l - 380.0) / (420.0 - 380.0);
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else if (l >= 380.0 && l <= 645.0) factor = 1.0;
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else if (l > 700.0 && l <= 780.0) factor = 0.3 + 0.7 * (780.0 - l) / (780.0 - 700.0);
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return vec3(r * factor, g * factor, b * factor);
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}
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void main() {
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float pixelX = gl_FragCoord.x;
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float pixelY = screenHeight - gl_FragCoord.y;
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// Diff de marche du à l'axe (2 * e) + micro -> nano
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float deltaLnm = 2.0 * (d1 - d2) * 1000.0;
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float relX = (pixelX - center.x) * zoom;
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float relY = (pixelY - center.y) * zoom;
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vec3 baseColorVec = WavelengthToRGB(lambda);
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// r^2
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float radiusSq = relX * relX + relY * relY;
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// Diff de marche lamme d'air 2 * e cos(i) mais petits angles => cos(i) ~ 1 - i^2/2 mais i ~ r/f et r^2 = x^2 + y^2
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float ringFactor = radiusSq * 0.065;
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// Diff de marche du au coin d'air
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float wDelta = relX * angleM1 * 200.0;
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float currDelta = deltaLnm - ringFactor + wDelta;
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// Formule de Fresnel : I = I_0 * cos^2(phi)
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float K = PI / lambda;
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float phase = currDelta * K;
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float intensity = cos(phase);
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intensity = intensity * intensity;
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vec3 finalVec = baseColorVec * intensity;
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finalColor = vec4(finalVec, 1.0);
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}
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