1 files changed, 23 insertions, 0 deletions
diff --git a/dev/a6-harold/shaders/outline.vert b/dev/a6-harold/shaders/outline.vert
new file mode 100644
index 0000000..a6073e5
--- /dev/null
+++ b/dev/a6-harold/shaders/outline.vert
@@ -0,0 +1,23 @@
+#version 330
+
+uniform mat4 modelViewMatrix;
+uniform mat4 normalMatrix;
+uniform mat4 projectionMatrix;
+uniform float thickness;
+
+layout(location = 0) in vec3 vertex;
+layout(location = 1) in vec3 normal;
+layout(location = 2) in vec3 leftNormal;
+layout(location = 3) in vec3 rightNormal;
+
+void main() {
+    vec3 p = (modelViewMatrix * vec4(vertex,1)).xyz;
+    vec3 e = -p;
+    vec3 nl = (normalMatrix * vec4(leftNormal,0)).xyz;
+    vec3 nr = (normalMatrix * vec4(rightNormal,0)).xyz;
+    vec3 v = vertex;
+    if (dot(e,nl) * dot(e,nr) < 0.0) {
+       v += thickness*normal;
+    }
+    gl_Position = projectionMatrix * modelViewMatrix * vec4(v,1);
+}