work

1 files changed, 14 insertions, 2 deletions

diff --git a/src/shaders/land.vert b/src/shaders/land.vert
index 2004ab3..1c9b9f3 100644
--- a/src/shaders/land.vert
+++ b/src/shaders/land.vert
@@ -1,14 +1,26 @@
 precision highp float;
 attribute vec3 land;
-uniform float time; //used for noise
+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;
-	gl_Position = P * MV * vec4(land.x - world_x, land.y - world_y, 0., 1.0);
+	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);
 }