Initial commit

extracted/assets/soupapi/shaders/post-process/outline.frag

@@ -0,0 +1,52 @@
+#version 330 core
+
+in vec2 v_TexCoord;
+in vec2 v_OneTexel;
+
+uniform sampler2D u_Texture;
+uniform int u_Width;
+uniform float u_FillOpacity;
+uniform int u_ShapeMode;
+uniform float u_GlowMultiplier;
+
+out vec4 color;
+
+void main() {
+    vec4 center = texture(u_Texture, v_TexCoord);
+
+    if (center.a != 0.0) {
+        if (u_ShapeMode == 0) discard;
+        center = vec4(center.rgb, center.a * u_FillOpacity);
+    }
+    else {
+        if (u_ShapeMode == 1) discard;
+
+        float dist = u_Width * u_Width * 4.0;
+
+        for (int x = -u_Width; x <= u_Width; x++) {
+            for (int y = -u_Width; y <= u_Width; y++) {
+                vec4 offset = texture(u_Texture, v_TexCoord + v_OneTexel * vec2(x, y));
+
+                if (offset.a != 0) {
+                    float ndist = x * x + y * y - 1.0;
+                    dist = min(ndist, dist);
+                    center = offset;
+                }
+            }
+        }
+
+        float minDist = u_Width * u_Width;
+
+        float falloff = clamp(1.0 - (dist / minDist), 0.0, 1.0);
+
+        if (dist > minDist || u_GlowMultiplier <= 0.0) {
+            center.a = 0.0;
+        } else {
+            // Use gamma-style amplification to keep the full multiplier range meaningful.
+            float exponent = 1.0 / max(u_GlowMultiplier, 0.0001);
+            center.a = pow(falloff, exponent);
+        }
+    }
+
+    color = center;
+}