SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/sp_grass_shadow.vert

@@ -0,0 +1,24 @@
+uniform int layer;
+uniform vec3 wind_direction;
+
+layout(location = 0) in vec3 i_position;
+layout(location = 2) in vec4 i_color;
+layout(location = 3) in vec2 i_uv;
+layout(location = 8) in vec3 i_origin;
+layout(location = 9) in vec4 i_rotation;
+layout(location = 10) in vec4 i_scale;
+
+#stk_include "utils/get_world_location.vert"
+
+out vec2 uv;
+
+void main()
+{
+    vec3 test = sin(wind_direction * (i_position.y * 0.1));
+    test += cos(wind_direction) * 0.7;
+    vec4 world_position = getWorldPosition(i_origin + test * i_color.r,
+        i_rotation, i_scale.xyz, i_position);
+
+    uv = i_uv;
+    gl_Position = u_shadow_projection_view_matrices[layer] * world_position;
+}