Moved the diffuse color calculation to the vertex shader.

assets/shaders/singleDiffuseLight/singleDiffuseLight_frag.glsl

@@ -1,16 +1,23 @@
+/*
+ * Copyright (C) 2014 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 #ifdef GL_ES
 precision mediump float;
 #endif
 
-// Camera world space position.
-uniform vec3 u_cameraPos;
-
-// Light source position
-uniform vec4 u_lightPos;
-
-// Diffuse light color.
-uniform vec4 u_lightDiffuse;
-
 // Ambient light color.
 uniform vec4 u_ambient;
 
@@ -26,25 +33,24 @@ varying vec3 v_normal;
 // Fragment color received from the vertex shader.
 varying vec4 v_color;
 
+// Fragment shaded diffuse color.
+varying vec4 v_diffuse;
+
+varying vec3 v_lightVector;
+varying vec3 v_eyeVector;
+varying vec3 v_reflectedVector;
+
 void main(){
-	vec3 normal = normalize(v_normal);
-	vec3 lightVector = normalize(u_lightPos.xyz - v_position.xyz);
-	vec3 eyeVector = normalize(u_cameraPos.xyz - v_position.xyz);
-	vec3 reflectedVector = normalize(-reflect(lightVector, normal));
-
-	// Ambient Term.
-	vec4 ambient = u_ambient;
-
-	// Diffuse Term.
-	vec4 diffuse = u_lightDiffuse * max(dot(normal, lightVector), 0.0);
-	diffuse = clamp(diffuse, 0.0, 1.0);
+	// Normalize the input varyings.
+	vec3 lightVector = normalize(v_lightVector);
+	vec3 eyeVector = normalize(v_eyeVector);
+	vec3 reflectedVector = normalize(v_reflectedVector);
 
 	// Specular Term:
 	vec4 specular = vec4(1.0) * pow(max(dot(reflectedVector, eyeVector), 0.0), 0.3 * u_shiny);
-	specular = clamp(specular, 0.0, 1.0);
 
 	// Aggregate light color.
-	vec4 lightColor = vec4(ambient.rgb + diffuse.rgb + specular.rgb, 1.0);
+	vec4 lightColor = clamp(vec4(u_ambient.rgb + v_diffuse.rgb + specular.rgb, 1.0), 0.0, 1.0);
 
 	// Final color.
 	gl_FragColor = clamp(lightColor * v_color, 0.0, 1.0);

assets/shaders/singleDiffuseLight/singleDiffuseLight_vert.glsl

@@ -1,8 +1,30 @@
+/*
+ * Copyright (C) 2014 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 // Model-view matrix.
 uniform mat4 u_projTrans;
 
-// Normal matrix.
-uniform mat4 u_normalMat;
+// Light source position
+uniform vec4 u_lightPos;
+
+// Diffuse light color.
+uniform vec4 u_lightDiffuse;
+
+// Camera world space position.
+uniform vec3 u_cameraPos;
 
 // Vertex position in world coordinates.
 attribute vec4 a_position;
@@ -13,19 +35,30 @@ attribute vec4 a_normal;
 // Vertex color.
 attribute vec4 a_color;
 
-// Vertex position to pass to the fragment shader.
-varying vec4 v_position;
-
-// Vertex normal to pass to the fragment shader.
-varying vec3 v_normal;
-
 // Vertex color to pass to the fragment shader.
 varying vec4 v_color;
 
-void main(){
-	v_position = u_projTrans * a_position;
-	v_color = a_color;
-	v_normal = vec3(u_normalMat * a_normal);
+// Diffuse shaded color to pass to the fragment shader.
+varying vec4 v_diffuse;
 
-	gl_Position = v_position;
+// The vector from the vertex to the light source.
+varying vec3 v_lightVector;
+
+// The vector from the vertex to the camera.
+varying vec3 v_eyeVector;
+
+// The light vector reflected around the vertex normal.
+varying vec3 v_reflectedVector;
+
+void main(){
+	// Set the varyings.
+	v_lightVector = normalize(u_lightPos.xyz - a_position.xyz);
+	v_eyeVector = normalize(u_cameraPos.xyz - a_position.xyz);
+	v_reflectedVector = normalize(-reflect(v_lightVector, a_normal.xyz));
+	v_color = a_color;
+
+	// Diffuse Term.
+	v_diffuse = u_lightDiffuse * max(dot(a_normal.xyz, v_lightVector), 0.0);
+
+	gl_Position = u_projTrans * a_position;
 }