Working shadows, however ugly they are.

src/Shaders/Fragment.glsl

@@ -1,22 +1,36 @@
 #version 430
 
 layout (binding=0) uniform sampler2D DiffuseTexture;
+layout (binding=1) uniform sampler2D ShadowTexture;
 
 in VertexData
 {
 	vec3 Position;
 	vec3 Normal;
 	vec2 TextureCoord;
+	vec4 ShadowCoord;
 } Input;
 
 out vec4 frag_Diffuse;
 out vec4 frag_Position;
 out vec4 frag_Normal;
 
+float Shadow(vec4 ShadowCoord)
+{
+	if( texture(ShadowTexture, Input.ShadowCoord.xy).z < ShadowCoord.z )
+	{
+		return 0.3;
+	}
+	else 
+	{
+		return 1.0;
+	}
+}
+
 void main()
 {
 	// Diffuse Texture
-	frag_Diffuse = texture(DiffuseTexture, Input.TextureCoord);
+	frag_Diffuse = texture(DiffuseTexture, Input.TextureCoord) * Shadow(Input.ShadowCoord);
 
 	// G-buffer Position
 	frag_Position = vec4(Input.Position.xyz, 1.0);