From 8b7d2d6c1a9e61585a34e411c10dd267bf45888f Mon Sep 17 00:00:00 2001
From: Stefan Dresselhaus <sdressel@techfak.uni-bielefeld.de>
Date: Tue, 21 Jan 2014 16:19:07 +0100
Subject: [PATCH] forgot shaders -.-

---
 shaders/tessControl.shader | 26 +++++++++++++++++++++++
 shaders/tessEval.shader    | 42 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 shaders/tessControl.shader
 create mode 100644 shaders/tessEval.shader

diff --git a/shaders/tessControl.shader b/shaders/tessControl.shader
new file mode 100644
index 0000000..36bae7f
--- /dev/null
+++ b/shaders/tessControl.shader
@@ -0,0 +1,26 @@
+#version 400
+
+layout(vertices = 3) out;
+in vec3 vPosition[];
+in vec4 vColor[];
+in vec3 vNormal[];
+out vec3 tcPosition[];
+out vec4 tcColor[];
+out vec3 tcNormal[];
+uniform float TessLevelInner = 1.0; // controlled by keyboard buttons
+uniform float TessLevelOuter = 1.0; // controlled by keyboard buttons
+
+#define ID gl_InvocationID
+
+void main()
+{
+    tcPosition[ID] = vPosition[ID];
+    tcColor[ID] = vColor[ID];
+    tcNormal[ID] = vNormal[ID];
+    if (ID == 0) {
+        gl_TessLevelInner[0] = TessLevelInner;
+        gl_TessLevelOuter[0] = TessLevelOuter;
+        gl_TessLevelOuter[1] = TessLevelOuter;
+        gl_TessLevelOuter[2] = TessLevelOuter;
+    }
+}
\ No newline at end of file
diff --git a/shaders/tessEval.shader b/shaders/tessEval.shader
new file mode 100644
index 0000000..35ae2d7
--- /dev/null
+++ b/shaders/tessEval.shader
@@ -0,0 +1,42 @@
+#version 400
+
+layout(triangles, equal_spacing, cw) in;
+in vec3 tcPosition[];
+in vec4 tcColor[];
+in vec3 tcNormal[];
+//out vec3 tePosition;
+out vec4 teColor;
+smooth out vec3 teNormal;
+//out vec3 tePatchDistance;
+//constant projection matrix
+uniform mat4 ProjectionMatrix;
+uniform mat4 ViewMatrix;
+uniform mat3 NormalMatrix;
+
+void main()
+{
+    vec3 p0 = gl_TessCoord.x * tcPosition[0];
+    vec3 p1 = gl_TessCoord.y * tcPosition[1];
+    vec3 p2 = gl_TessCoord.z * tcPosition[2];
+    //tePatchDistance = gl_TessCoord;
+    vec3 tePosition = p0 + p1 + p2;
+
+    vec3 n0 = gl_TessCoord.x * tcNormal[0];
+    vec3 n1 = gl_TessCoord.y * tcNormal[1];
+    vec3 n2 = gl_TessCoord.z * tcNormal[2];
+    vec3 tessNormal = normalize(n0 + n1 + n2);
+    teNormal = NormalMatrix * tessNormal;
+
+    //sin(a,b) = length(cross(a,b))
+    float i0 = (1-gl_TessCoord.x)*gl_TessCoord.x * length(cross(tcNormal[0],tessNormal));
+    float i1 = (1-gl_TessCoord.y)*gl_TessCoord.y * length(cross(tcNormal[1],tessNormal));
+    float i2 = (1-gl_TessCoord.z)*gl_TessCoord.z * length(cross(tcNormal[2],tessNormal));
+    float standout = i0+i1+i2;
+
+    vec4 c0 = gl_TessCoord.x * tcColor[0];
+    vec4 c1 = gl_TessCoord.y * tcColor[1];
+    vec4 c2 = gl_TessCoord.z * tcColor[2];
+    teColor = c0 + c1 + c2;
+
+    gl_Position = ProjectionMatrix * ViewMatrix * vec4(tePosition+tessNormal*standout, 1);
+}
\ No newline at end of file