Re-import bgm as ogg, fix teleport bug (hopefully)

GameLogic/Main.gdshader

@@ -0,0 +1,22 @@
+shader_type sky;
+
+uniform vec3 color_top : source_color = vec3(0.91, 0.14, 1);
+uniform vec3 color_horizon : source_color = vec3(1, 0.4, 0.42);
+uniform vec3 color_bottom : source_color = vec3(1, 0.74, 0.39);
+
+uniform float exponent_factor_top : hint_range(0, 100) = 1.0;
+uniform float exponent_factor_bottom : hint_range(0, 100) = 1.0;
+uniform float intensity_amp : hint_range(0, 1) = 1.0;
+
+void sky() {
+	float p = EYEDIR.y;
+	float p1 = 1.0f - pow(min(1.0f, 1.0f - p), exponent_factor_top);
+	float p3 = 1.0f - pow(min(1.0f, 1.0f + p), exponent_factor_bottom);
+	float p2 = 1.0f - p1 - p3;
+	
+	COLOR = (
+		color_top * p1 +
+		color_horizon * p2 +
+		color_bottom * p3
+	) * intensity_amp;
+}