80 lines
2.5 KiB
GLSL
80 lines
2.5 KiB
GLSL
#version 450
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#include "compiled.inc" // bloomKnee, bloomThreshold
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#include "std/resample.glsl"
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uniform sampler2D tex;
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uniform vec2 screenSizeInv;
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uniform int currentMipLevel;
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#ifdef _CPostprocess
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uniform vec4 BloomThresholdData; // Only filled with data if currentMipLevel == 0
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#endif
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in vec2 texCoord;
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out vec4 fragColor;
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const float epsilon = 6.2e-5; // see https://github.com/keijiro/KinoBloom/issues/15
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#ifdef _BloomAntiFlicker
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const bool antiFlicker = true;
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#else
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const bool antiFlicker = false;
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#endif
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void main() {
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if (antiFlicker && currentMipLevel == 0) {
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#ifdef _BloomQualityHigh
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fragColor.rgb = downsample_13_tap_anti_flicker(tex, texCoord, screenSizeInv);
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#else
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#ifdef _BloomQualityMedium
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fragColor.rgb = downsample_dual_filter_anti_flicker(tex, texCoord, screenSizeInv);
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#else // _BloomQualityLow
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fragColor.rgb = downsample_box_filter_anti_flicker(tex, texCoord, screenSizeInv);
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#endif
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#endif
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}
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else {
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#ifdef _BloomQualityHigh
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fragColor.rgb = downsample_13_tap(tex, texCoord, screenSizeInv);
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#else
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#ifdef _BloomQualityMedium
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fragColor.rgb = downsample_dual_filter(tex, texCoord, screenSizeInv);
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#else // _BloomQualityLow
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fragColor.rgb = downsample_box_filter(tex, texCoord, screenSizeInv);
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#endif
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#endif
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}
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if (currentMipLevel == 0) {
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// https://catlikecoding.com/unity/tutorials/advanced-rendering/bloom/#3.2
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// https://catlikecoding.com/unity/tutorials/advanced-rendering/bloom/#3.4
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float brightness = max(fragColor.r, max(fragColor.g, fragColor.b));
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#ifdef _CPostprocess
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// Only apply precalculation optimization if _CPostprocess, otherwise
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// the compiler is able to do the same optimization for the constant
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// values from compiled.inc without the need to pass a uniform
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float softeningCurve = brightness - BloomThresholdData.y;
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softeningCurve = clamp(softeningCurve, 0.0, BloomThresholdData.z); // "connect" to hard knee curve
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softeningCurve = softeningCurve * softeningCurve * BloomThresholdData.w;
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float contributionFactor = max(softeningCurve, brightness - BloomThresholdData.x);
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#else
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float softeningCurve = brightness - bloomThreshold + bloomKnee;
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softeningCurve = clamp(softeningCurve, 0.0, 2.0 * bloomKnee);
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softeningCurve = softeningCurve * softeningCurve / (4 * bloomKnee + epsilon);
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float contributionFactor = max(softeningCurve, brightness - bloomThreshold);
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#endif
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contributionFactor /= max(epsilon, brightness);
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fragColor.rgb *= contributionFactor;
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}
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fragColor.a = 1.0;
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}
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