From 3a975db66a3711f34e8b64bb27a8eaca79fdeca9 Mon Sep 17 00:00:00 2001 From: Alex Pickering Date: Sun, 1 Feb 2026 13:14:32 -0600 Subject: Initial commit --- src/shaders/land.vert | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 src/shaders/land.vert (limited to 'src/shaders/land.vert') 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); +} -- cgit v1.2.3-70-g09d2