add missing shaders

shaders/celestial.frag

@@ -0,0 +1,25 @@
+in vec2 f_coord;
+
+#texture (tex1, 0, sRGB_A)
+uniform sampler2D tex1;
+
+#include <common>
+#include <tonemapping.glsl>
+
+layout(location = 0) out vec4 out_color;
+#if MOTIONBLUR_ENABLED
+layout(location = 1) out vec4 out_motion;
+#endif
+
+void main()
+{
+	vec4 tex_color = texture(tex1, f_coord);
+#if POSTFX_ENABLED
+	out_color = tex_color * param[0];
+#else
+    out_color = tonemap(tex_color * param[0]);
+#endif
+#if MOTIONBLUR_ENABLED
+	out_motion = vec4(0.0f);
+#endif
+}