X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=builtin_data%2F_sky_transmittance.glsl;fp=builtin_data%2F_sky_transmittance.glsl;h=9d7b719a93aafc3b37c93a1ce437735053c61c95;hb=06d83c11e10208478487dea864ddd7822630c391;hp=0000000000000000000000000000000000000000;hpb=e98956208676c77e74462f17932ac530077a0540;p=libs%2Fgl.git

diff --git a/builtin_data/_sky_transmittance.glsl b/builtin_data/_sky_transmittance.glsl
new file mode 100644
index 00000000..9d7b719a
--- /dev/null
+++ b/builtin_data/_sky_transmittance.glsl
@@ -0,0 +1,13 @@
+import flat_effect;
+import _sky;
+
+#pragma MSP stage(fragment)
+layout(location=0) out vec3 frag_color;
+void main()
+{
+	float height = texcoord.x*texcoord.x*atmosphere_thickness;
+	float z = texcoord.y;
+	float r = sqrt(1.0-z*z);
+	vec3 look_dir = vec3(r, 0.0, z);
+	frag_color = exp(-raymarch_path(height, look_dir).optical_depth);
+}