Adding procedural textures to the ground

scripts/shaders/TextureSplit.gdshader

@@ -0,0 +1,57 @@
+shader_type canvas_item;
+
+#define pow2(x) (x * x)
+#define iResolution 1.0/SCREEN_PIXEL_SIZE
+
+uniform sampler2D data_texture;
+uniform vec2 data_texture_size;
+uniform sampler2D texture_low : filter_nearest, repeat_enable;
+uniform float texture_low_threshold : hint_range(0, 1) = 0.3;
+uniform sampler2D texture_medium : filter_nearest, repeat_enable;
+uniform sampler2D texture_high : filter_nearest, repeat_enable;
+uniform float texture_high_threshold : hint_range(0, 1) = 0.7;
+
+uniform int dimension;
+uniform vec2 texture_size = vec2(100,100);
+
+uniform float smooth_change_range = 0.15;
+
+varying vec2 vert;
+
+void vertex() {
+	vert = VERTEX;
+}
+
+void fragment() {
+	vec4 pixel_color = texture(data_texture, vert/data_texture_size);
+	float value = pixel_color.x;
+	if (dimension == 1) value = pixel_color.y;
+	if (dimension == 2) value = pixel_color.z;
+	
+	vec4 color = texture(texture_medium, vert/texture_size);
+	
+	if (value < texture_low_threshold)
+		color = 
+			min(
+				(texture_low_threshold - value) / smooth_change_range, 
+				1.0
+			) * texture(texture_low, vert/texture_size) 
+			+ (1.0 - min(
+					(texture_low_threshold - value) / smooth_change_range, 
+					1.0
+				)
+			) * texture(texture_medium, vert/texture_size);
+	if (value > texture_high_threshold)
+		color = 
+			min(
+				(value - texture_high_threshold) / smooth_change_range, 
+				1.0
+			) * texture(texture_high, vert/texture_size) 
+			+ (1.0 - min(
+					(value - texture_high_threshold) / smooth_change_range, 
+					1.0
+				)
+			) * texture(texture_medium, vert/texture_size);
+	
+	COLOR = color;
+}