diff --git a/libs/gfx/include/psemek/gfx/renderer/deferred.hpp b/libs/gfx/include/psemek/gfx/renderer/deferred.hpp
index d3084898..8184c65a 100644
--- a/libs/gfx/include/psemek/gfx/renderer/deferred.hpp
+++ b/libs/gfx/include/psemek/gfx/renderer/deferred.hpp
@@ -38,7 +38,6 @@ namespace psemek::gfx
 			bool blooming = false;
 			bool casts_shadow = true;
 
-			float diffuse = 1.f;
 			struct
 			{
 				// specular highlight is calculated as
diff --git a/libs/gfx/source/renderer/deferred.cpp b/libs/gfx/source/renderer/deferred.cpp
index d58732c3..3e54578e 100644
--- a/libs/gfx/source/renderer/deferred.cpp
+++ b/libs/gfx/source/renderer/deferred.cpp
@@ -99,7 +99,7 @@ R"(
 
 uniform vec4 u_color;
 uniform sampler2D u_texture;
-uniform vec3 u_material;
+uniform vec2 u_material;
 uniform float u_max_intensity;
 
 in vec3 position;
@@ -110,7 +110,7 @@ in vec3 normal;
 layout (location = 0) out vec3 out0;
 layout (location = 1) out vec4 out1;
 layout (location = 2) out uint out2;
-layout (location = 3) out vec3 out3;
+layout (location = 3) out vec2 out3;
 
 uint pack_normal(vec3 n)
 {
@@ -390,7 +390,7 @@ void main()
 
 	vec3 position = texture(u_g0, texcoord).xyz;
 	vec3 normal = unpack_normal(texture(u_g2, texcoord).r);
-	vec3 material = texture(u_g3, texcoord).xyz;
+	vec2 material = texture(u_g3, texcoord).xy;
 
 	vec3 view = normalize(u_camera_position - position);
 
@@ -398,7 +398,7 @@ void main()
 
 	vec3 refl = 2.0 * normal * d - u_light_direction;
 
-	float l = max(0.0, d) * material.x + pow(max(0.0, dot(view, refl)), material.z) * material.y;
+	float l = max(0.0, d) + pow(max(0.0, dot(view, refl)), material.y) * material.x;
 
 	vec3 color = l * albedo.rgb * u_light_color;
 
@@ -447,7 +447,7 @@ void main()
 
 	vec3 position = texture(u_g0, texcoord).xyz;
 	vec3 normal = unpack_normal(texture(u_g2, texcoord).r);
-	vec3 material = texture(u_g3, texcoord).xyz;
+	vec2 material = texture(u_g3, texcoord).xy;
 
 	vec3 view = normalize(u_camera_position - position);
 
@@ -461,7 +461,7 @@ void main()
 
 	vec3 refl = 2.0 * normal * d - light_n;
 
-	float l = max(0.0, d) * material.x + pow(max(0.0, dot(view, refl)), material.z) * material.y;
+	float l = max(0.0, d) + pow(max(0.0, dot(view, refl)), material.y) * material.x;
 
 	vec3 color = l * albedo.rgb * u_light_color / (u_light_attenuation.x + r * (u_light_attenuation.y + r * u_light_attenuation.z));
 
@@ -985,7 +985,7 @@ void main()
 					if (mask & O_POST_TRANSFORM)
 						program["u_post_transform"] = *o.post_transform;
 
-					program["u_material"] = geom::vector<float, 3>{o.mat->diffuse, o.mat->specular.intensity, o.mat->specular.shininess};
+					program["u_material"] = geom::vector<float, 2>{o.mat->specular.intensity, o.mat->specular.shininess};
 
 					o.mesh->draw();
 				}
@@ -1007,7 +1007,7 @@ void main()
 			{
 				impl().g_buffer_texture[1].load<geom::vector<std::uint16_t, 4>>(buffer_size);
 				impl().g_buffer_texture[2].load<gfx::integer<std::uint32_t>>(buffer_size);
-				impl().g_buffer_texture[3].load<geom::vector<gfx::float16, 3>>(buffer_size);
+				impl().g_buffer_texture[3].load<geom::vector<gfx::float16, 2>>(buffer_size);
 				impl().g_buffer_depth.load<gfx::depth24_pixel>(buffer_size);
 			}