1 files changed, 24 insertions, 0 deletions
diff --git a/src/core/render/shaders/diffuse.frag b/src/core/render/shaders/diffuse.frag
new file mode 100644
index 000000000..75b49820b
--- /dev/null
+++ b/src/core/render/shaders/diffuse.frag
@@ -0,0 +1,24 @@
+#version 330
+
+uniform vec4 lightPosition;
+uniform vec3 lightIntensity;
+uniform vec3 kd; // Diffuse reflectivity
+uniform vec3 ka; // Ambient reflectivity
+
+in vec3 position;
+in vec3 normal;
+
+layout (location = 0) out vec4 fragColor;
+
+void main()
+{
+    // Calculate the vector from the light to the fragment
+    vec3 s = normalize( vec3( lightPosition ) - position );
+
+    // Calculate the diffuse lighting factor
+    vec3 n = normalize( normal );
+    float diffuse = max( dot( s, n ), 0.0 );
+
+    // Multiply by incoming light intensity
+    fragColor = vec4( lightIntensity * (kd * diffuse + ka), 1.0 );
+}