uniform sampler2D colorTexture;
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uniform sampler2D blurTexture;
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uniform sampler2D depthTexture;
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uniform float focalDistance;
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varying vec2 v_textureCoordinates;
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vec4 toEye(vec2 uv, float depth)
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{
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vec2 xy = vec2((uv.x * 2.0 - 1.0), ((1.0 - uv.y) * 2.0 - 1.0));
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vec4 posInCamera = czm_inverseProjection * vec4(xy, depth, 1.0);
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posInCamera = posInCamera / posInCamera.w;
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return posInCamera;
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}
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float computeDepthBlur(float depth)
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{
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float f;
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if (depth < focalDistance)
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{
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f = (focalDistance - depth) / (focalDistance - czm_currentFrustum.x);
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}
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else
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{
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f = (depth - focalDistance) / (czm_currentFrustum.y - focalDistance);
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f = pow(f, 0.1);
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}
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f *= f;
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f = clamp(f, 0.0, 1.0);
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return pow(f, 0.5);
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}
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void main(void)
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{
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float depth = czm_readDepth(depthTexture, v_textureCoordinates);
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vec4 posInCamera = toEye(v_textureCoordinates, depth);
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float d = computeDepthBlur(-posInCamera.z);
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gl_FragColor = mix(texture2D(colorTexture, v_textureCoordinates), texture2D(blurTexture, v_textureCoordinates), d);
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}
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