1 files changed, 47 insertions, 0 deletions
diff --git a/vk-cube/vk-cube-fs.glsl b/vk-cube/vk-cube-fs.glsl
new file mode 100644
index 0000000..622d2bd
--- /dev/null
+++ b/vk-cube/vk-cube-fs.glsl
@@ -0,0 +1,47 @@
+#version 450
+// ================================================================================================
+// Fragment shader, basic Phong shading
+//
+// Build:
+//     $ glslc -o vk-cube-fs.spv -fshader-stage=fragment vk-cube-fs.glsl
+//
+// Changelog:
+//     5/31/2026: Initial release
+//
+// License:
+//     Copyright (c) 2026 Hunter Kvalevog
+//
+//     Permission to use, copy, modify, and/or distribute this software for any
+//     purpose with or without fee is hereby granted.
+//
+//     THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+//     WITH REGARD TO THIS SOFTWARE.
+// ================================================================================================
+
+layout (location = 0) in vec3 f_c;
+layout (location = 1) in vec3 f_n;
+layout (location = 2) in vec3 f_p;
+
+layout (location = 0) out vec4 out_color;
+
+void main()
+{
+    vec3 light_pos = vec3(0.0f, 0.0f, -2.0f);
+    vec3 light_dir = normalize(light_pos - f_p);
+    vec3 view_dir  = normalize(-f_p);
+
+    // ambient
+    float ambient = 0.15f;
+
+    // diffuse
+    float diffuse = max(dot(f_n, light_dir), 0.0f);
+
+    // specular
+    vec3 reflect_dir = reflect(-light_dir, f_n);
+    float spec = pow(max(dot(view_dir, reflect_dir), 0.0f), 32.0f);
+
+    vec3 result = (ambient + diffuse + 0.5 * spec) * f_c;
+
+    out_color = vec4(result, 1.0f);
+}
+