Migration to Codeberg

2024-father-and-son/shaders/radial_light.fs

@@ -0,0 +1,41 @@
+#version 330           // Adjust version if needed
+
+// Our uniforms (variables passed from the CPU code):
+uniform vec2 lightPos;  // Torch position in *screen* coordinates
+uniform float radius;   // How far the torch reaches
+uniform float intensity; // Brightness at the center
+
+// Varyings from raylib's default vertex shader
+in vec2 fragTexCoord;   // [0..1] texture coordinates
+in vec4 fragColor;      // Not often needed here
+
+// The texture(s) we read from
+uniform sampler2D texture0;
+
+// Final color we output
+out vec4 finalColor;
+
+void main()
+{
+    // Grab whatever is in the render texture at this pixel:
+    vec4 color = texture(texture0, fragTexCoord);
+
+    // Convert fragTexCoord from [0..1] range into actual screen coords.
+    // If your screen is 1280x720, for example:
+    vec2 screenCoord = vec2(fragTexCoord.x * 1280.0,
+                            fragTexCoord.y * 720.0);
+
+    // Distance from this pixel to the torch center:
+    float dist = distance(screenCoord, lightPos);
+
+    // Basic “1 - distance/radius” falloff. 
+    // Then clamp so it won’t go below 0 or above 1.
+    float factor = 1.0 - (dist / radius);
+    factor = clamp(factor, 0.0, 1.0);
+
+    // Multiply by intensity if you want the center brighter or dimmer.
+    factor *= intensity;
+
+    // Multiply the original color by our factor:
+    finalColor = vec4(color.rgb * factor, color.a);
+}