stuff

shaders/bloom_extract.frag

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+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+uniform float threshold;
+
+void main()
+{
+    // Averaged, since a quarter size target would otherwise skip most of the screen's pixels
+    vec2 texel = 1.0 / vec2(textureSize(screenTexture, 0));
+    vec3 color = (texture(screenTexture, TexCoords + texel * vec2(-1.0, -1.0)).rgb
+        + texture(screenTexture, TexCoords + texel * vec2(1.0, -1.0)).rgb
+        + texture(screenTexture, TexCoords + texel * vec2(-1.0, 1.0)).rgb
+        + texture(screenTexture, TexCoords + texel * vec2(1.0, 1.0)).rgb) * 0.25;
+
+    // A single blown out specular pixel would otherwise flash a huge glow
+    color = min(color, vec3(20.0));
+
+    // Keeps the hue of whatever is over the threshold, and fades in instead of cutting off
+    float brightness = max(color.r, max(color.g, color.b));
+    float contribution = max(brightness - threshold, 0.0) / max(brightness, 1e-4);
+
+    FragColor = vec4(color * contribution, 1.0);
+}