Open source Star Ruler 2 source code!

data/shaders/source/pl_normal_vs.txt

@@ -0,0 +1,40 @@
+attribute vec4 in_position;
+attribute vec3 in_normal;
+attribute vec2 in_uv;
+
+varying vec3 npos;
+varying vec3 normal, binormal, tangent;
+varying vec2 uv;
+
+uniform float flipState;
+
+void main()
+{
+	normal = normalize(gl_NormalMatrix * in_normal);
+	binormal = normalize(cross(normal, gl_NormalMatrix * vec3(0.0,0.999,0.04471017781)));
+	tangent = normalize(cross(normal, binormal));
+	
+	vec4 pos = gl_ModelViewMatrix * in_position;
+	npos = -pos.xyz;
+	
+	vec2 baseUV = in_uv;
+	if(flipState < 0.5) {
+		if(flipState < 0.25) {
+			baseUV.x = 1.0 - baseUV.x;
+			binormal = -binormal;
+		}
+	}
+	else {
+		if(flipState < 0.75) {
+			baseUV.y = 1.0 - baseUV.y;
+			tangent = -tangent;
+		}
+		else {
+			baseUV = vec2(1.0) - baseUV;
+			binormal = -binormal;
+			tangent = -tangent;
+		}
+	}
+	uv = baseUV;
+	gl_Position = gl_ProjectionMatrix * pos;
+}