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-rw-r--r--dev/a6-harold/shaders/outline.vert23
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);
+}