29 lines
907 B
Forth
29 lines
907 B
Forth
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precision mediump float;
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varying vec4 clipSpace;
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uniform sampler2D reflectionTexture;
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uniform sampler2D refractionTexture;
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uniform sampler2D dudvMap;
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varying vec2 uv;
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const float waveStrength = 0.002;
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void main() {
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vec2 ndc = (clipSpace.xy / clipSpace.w) / 2.0 + 0.5;
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vec2 refractTexCoords = vec2(ndc.x, ndc.y);
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vec2 reflectTexCoords = vec2(ndc.x, 1.0 - ndc.y);
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vec2 distortion1 = texture2D(dudvMap, uv).xy * 2.0 - 1.0 * waveStrength;
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refractTexCoords += distortion1;
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refractTexCoords = clamp(refractTexCoords, 0.001, 0.999);
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reflectTexCoords += distortion1;
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reflectTexCoords.x = clamp(reflectTexCoords.x, 0.001, 0.999);
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reflectTexCoords.y = clamp(reflectTexCoords.y, -0.999, -0.001);
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vec4 reflectColor = texture2D(reflectionTexture, reflectTexCoords);
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vec4 refractColor = texture2D(refractionTexture, refractTexCoords);
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gl_FragColor = mix(reflectColor, refractColor, 0.5);
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}
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