From 1bbe0db68dad190d619e362794b7b2bb047dbd21 Mon Sep 17 00:00:00 2001
From: unknown <sonofgrendel@gmail.com>
Date: Fri, 23 May 2014 17:00:57 -0430
Subject: [PATCH] Added modified directional light shader.

---
 .../directionalPerPixel_frag.glsl             | 60 ++++++++++++++++
 .../directionalPerPixel_vert.glsl             | 70 +++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_frag.glsl
 create mode 100644 assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_vert.glsl

diff --git a/assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_frag.glsl b/assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_frag.glsl
new file mode 100644
index 0000000..02c8fa3
--- /dev/null
+++ b/assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_frag.glsl
@@ -0,0 +1,60 @@
+/*
+ * 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
+
+// Ambient light color.
+uniform vec4 u_ambient;
+
+// Specular light color.
+uniform vec4 u_specular;
+
+// Shininess.
+uniform float u_shiny;
+
+// Fragment normal.
+varying vec3 v_normal;
+
+// Fragment shaded diffuse color.
+varying vec4 v_diffuse;
+
+// Vector from the fragment to the light source.
+varying vec3 v_lightVector;
+
+// Vector from the fragment to the camera.
+varying vec3 v_eyeVector;
+
+// The light vector reflected around the fragment normal.
+varying vec3 v_reflectedVector;
+
+void main(){
+	// Normalize the input varyings.
+	vec3 normal = normalize(v_normal);
+	vec3 lightVector = normalize(v_lightVector);
+	vec3 eyeVector = normalize(v_eyeVector);
+	vec3 reflectedVector = normalize(v_reflectedVector);
+
+	// Specular Term:
+	vec4 specular = u_specular * pow(max(dot(reflectedVector, eyeVector), 0.0), u_shiny);
+
+	// Aggregate light color.
+	vec4 finalColor = clamp(vec4(u_ambient.rgb + v_diffuse.rgb + specular.rgb, 1.0), 0.0, 1.0);
+
+	// Final color.
+	gl_FragColor = finalColor;
+}
diff --git a/assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_vert.glsl b/assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_vert.glsl
new file mode 100644
index 0000000..e15b749
--- /dev/null
+++ b/assets/shaders/directionalPerPixelSingleLight/directionalPerPixel_vert.glsl
@@ -0,0 +1,70 @@
+/*
+ * 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;
+
+// The world space geometric transformation to apply to this vertex.
+uniform mat4 u_geomTrans;
+
+// Light source position
+uniform vec3 u_lightPos;
+
+// Diffuse light color.
+uniform vec4 u_lightDiffuse;
+
+// Camera world space position.
+uniform vec3 u_cameraPos;
+
+// Vertex color.
+uniform vec4 u_materialDiffuse;
+
+// Vertex position in world coordinates.
+attribute vec4 a_position;
+
+// Vertex normal.
+attribute vec4 a_normal;
+
+// Fragment normal.
+varying vec3 v_normal;
+
+// Diffuse shaded color to pass to the fragment shader.
+varying vec4 v_diffuse;
+
+// 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(){
+	// Apply the geometric transformation to the original position of the vertex.
+	vec4 transformedPosition = u_geomTrans * a_position;
+
+	// Set the varyings.
+	v_normal = normalize(a_normal.xyz);
+	v_lightVector = normalize(transformedPosition.xyz - u_lightPos.xyz);
+	v_eyeVector = normalize(u_cameraPos.xyz - transformedPosition.xyz);
+	v_reflectedVector = normalize(reflect(-v_lightVector, a_normal.xyz));
+
+	// Diffuse Term.
+	v_diffuse = u_lightDiffuse * u_materialDiffuse * max(dot(a_normal.xyz, v_lightVector), 0.0);
+
+	gl_Position = u_projTrans * transformedPosition;
+}