1 files changed, 69 insertions, 0 deletions
diff --git a/res/sdr/mdl_lit.fs b/res/sdr/mdl_lit.fs
new file mode 100644
index 0000000..f3a51c6
--- /dev/null
+++ b/res/sdr/mdl_lit.fs
@@ -0,0 +1,69 @@
+#version 330
+
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+uniform vec3 sun_direction;
+uniform vec3 sun_colour;
+uniform float sun_intensity;
+
+uniform vec3 moon_direction;
+uniform vec3 moon_colour;
+uniform float moon_intensity;
+
+uniform vec3 ambient_colour;
+uniform float ambient_intensity;
+
+in vec2 frag_texcoord;
+in vec4 frag_colour;
+in vec3 frag_world_normal;
+
+out vec4 finalColor;
+
+void
+main()
+{
+	vec3 normal = normalize(frag_world_normal);
+
+	// float sun_diffuse = max(
+	// 	dot(normal, sun_direction),
+	// 	0.0
+	// );
+
+	// half lambert
+	float sun_diffuse = dot(normal, sun_direction) * 0.5 + 0.5;
+	sun_diffuse *= sun_diffuse;
+
+	float moon_diffuse = max(
+		dot(normal, moon_direction),
+		0.0
+	);
+
+	vec3 ambient_light =
+		ambient_colour * ambient_intensity;
+
+	vec3 sun_light =
+		sun_colour *
+		sun_intensity *
+		sun_diffuse;
+
+	vec3 moon_light =
+		moon_colour *
+		moon_intensity *
+		moon_diffuse;
+
+	vec3 lighting =
+		ambient_light +
+		sun_light +
+		moon_light;
+
+	vec4 texel =
+		texture(texture0, frag_texcoord) *
+		colDiffuse *
+		frag_colour;
+
+	finalColor = vec4(
+		texel.rgb * max(lighting, vec3(0.0)),
+		texel.a
+	);
+}