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			32 lines
		
	
	
	
		
			792 B
		
	
	
	
		
			GLSL
		
	
	
	
	
	
			
		
		
	
	
			32 lines
		
	
	
	
		
			792 B
		
	
	
	
		
			GLSL
		
	
	
	
	
	
| uniform float near;
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| uniform float far;
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| uniform sampler2D opaqueDepthTex;
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| uniform vec2 screenRes;
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| uniform float particleSize;
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| 
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| float viewDepth(float depth)
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| {
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| #if @reverseZ
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|     depth = 1.0 - depth;
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| #endif
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|     return (near * far) / ((far - near) * depth - far);
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| }
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| 
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| float calcSoftParticleFade()
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| {
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|     const float falloffMultiplier = 0.33;
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|     const float contrast = 1.30;
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| 
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|     vec2 screenCoords = gl_FragCoord.xy / screenRes;
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|     float sceneDepth = viewDepth(texture2D(opaqueDepthTex, screenCoords).x);
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|     float particleDepth = viewDepth(gl_FragCoord.z);
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|     float falloff = particleSize * falloffMultiplier;
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|     float delta = particleDepth - sceneDepth;
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| 
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|     if (delta < 0.0)
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|         discard;
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| 
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|     const float shift = 0.845;
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| 
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|     return shift * pow(clamp(delta/falloff, 0.0, 1.0), contrast);
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| }
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