simple tile heights

src/scenes/shader/tile_frag.glsl

@@ -0,0 +1,28 @@
+#version 150
+
+in vec2 v_uv;
+flat in uint v_tileidx;
+out vec4 pixcolor;
+uniform sampler2D t_atlas;
+uniform b_constants {
+  //uvec4 animdata;
+  uint animdata;
+  float R1;
+  float R2;
+};
+uniform b_locals {
+  mat4 camera;
+  uint millis;
+  float treadmill_x;
+  float treadmill_y;
+};
+
+void main() {
+  vec2 anim_uv = v_uv;
+  //if (v_tileidx < 128u && bool(animdata[0 /*v_tileidx / 32u*/] & 1u << v_tileidx % 32u)) {
+  if (v_tileidx < 32u && bool(animdata & 1u << v_tileidx)) {
+    anim_uv = vec2(v_uv.x, float((uint(v_uv.y * 1000.0) + millis / 4u) % 1000u) / 1000.0);
+  }
+  vec2 uv = vec2(anim_uv.x, float(v_tileidx) / 256.0 + (1.0 - anim_uv.y) / 256.0);
+  pixcolor = texture(t_atlas, uv);
+}