46 lines
1.3 KiB
GLSL
46 lines
1.3 KiB
GLSL
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#version 450
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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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in vec2 texCoord;
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out vec4 fragColor;
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const float bloomKnee = 0.5;
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const float bloomThreshold = 0.8;
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const float epsilon = 6.2e-5;
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vec3 downsample_dual_filter(const sampler2D tex, const vec2 texCoord, const vec2 texelSize) {
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vec3 delta = texelSize.xyx * vec3(0.5, 0.5, -0.5);
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vec3 result;
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result = textureLod(tex, texCoord, 0.0).rgb * 4.0;
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result += textureLod(tex, texCoord - delta.xy, 0.0).rgb;
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result += textureLod(tex, texCoord - delta.zy, 0.0).rgb;
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result += textureLod(tex, texCoord + delta.zy, 0.0).rgb;
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result += textureLod(tex, texCoord + delta.xy, 0.0).rgb;
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return result * (1.0 / 8.0);
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}
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void main() {
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fragColor.rgb = downsample_dual_filter(tex, texCoord, screenSizeInv);
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if (currentMipLevel == 0) {
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float brightness = max(fragColor.r, max(fragColor.g, fragColor.b));
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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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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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