init

assets/shaders/bloom_up.frag

@@ -0,0 +1,18 @@
+#version 450 core
+// 3x3 tent upsample, additively blended into the next larger mip.
+
+in vec2 vUV;
+layout(binding = 0) uniform sampler2D uSrc;
+uniform vec2 uSrcTexel;
+uniform float uRadius;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    vec2 t = uSrcTexel * uRadius;
+    vec3 s = texture(uSrc, vUV).rgb * 4.0;
+    s += (texture(uSrc, vUV + vec2(-t.x, 0)).rgb + texture(uSrc, vUV + vec2(t.x, 0)).rgb +
+          texture(uSrc, vUV + vec2(0, -t.y)).rgb + texture(uSrc, vUV + vec2(0, t.y)).rgb) * 2.0;
+    s += texture(uSrc, vUV + vec2(-t.x, -t.y)).rgb + texture(uSrc, vUV + vec2(t.x, -t.y)).rgb +
+         texture(uSrc, vUV + vec2(-t.x, t.y)).rgb + texture(uSrc, vUV + vec2(t.x, t.y)).rgb;
+    fragColor = vec4(s / 16.0, 1.0);
+}