1 files changed, 26 insertions, 0 deletions
diff --git a/src/shaders/land.vert b/src/shaders/land.vert
new file mode 100644
index 0000000..1c9b9f3
--- /dev/null
+++ b/src/shaders/land.vert
@@ -0,0 +1,26 @@
+precision highp float;
+attribute vec3 land;
+attribute vec2 landnormal;
+uniform float rot;
+uniform float world_x;
+uniform float world_y;
+uniform mat4 MV;
+uniform mat4 P;
+varying vec2 worldxy;
+varying mat4 pre;
+varying vec2 norm;
+void main() {
+	norm = landnormal;
+	mat2 rotate = mat2(
+		cos(rot), -sin(rot),
+		sin(rot), cos(rot)
+	);
+	worldxy = vec2(world_x, world_y);
+	pre = P * MV;
+	vec2 local = (land.xy - worldxy) * rotate;
+	float z_scale = 0.5;
+	// clamp so that everything becomes orthographic once we move away
+	float xoff = clamp(land.z * local.x * z_scale, -0.5, 0.5);
+	float yoff = clamp(land.z * local.y * z_scale, -0.5, 0.5);
+	gl_Position = P * MV * vec4(local.xy - vec2(xoff, yoff), land.z, 1.0);
+}