first commit

stairs.gdshader

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+shader_type canvas_item;
+uniform int step_count = 168;
+uniform int inner = 101;
+uniform int pixel_size = 121;
+uniform int highlight = 0;
+uniform float grid_thickness = 0.125;
+uniform float offset = 0.0;
+
+float mask(float inner_radius, float outer_radius, vec2 p) {
+	if (inner_radius < length(p) && length(p) < outer_radius) {
+		return 1.0;
+	} else {
+		return 0.0;
+	}
+}
+
+float f(vec2 uv, vec2 p) {
+	
+	float angle = atan(p.y, p.x) / PI / 2.0 + 0.5 + offset/float(step_count);
+	float color = round(angle * float(step_count)) / float(step_count);
+
+
+	return color;
+}
+
+float grid_mask(vec2 uv) {
+	float x = mod(uv.x*float(pixel_size), 1.0);
+	float y = mod(uv.y*float(pixel_size), 1.0);
+	return step(grid_thickness, x)* step(grid_thickness, y);
+}
+
+void fragment() {
+	vec2 p = UV - vec2(0.5, 0.5);
+	p = round(p * float(pixel_size)) / float(pixel_size);
+	
+	float color = f(UV, p);
+	//color *= edge_mask(UV, vec2(0.002, 0.002));
+	vec3 chroma = vec3(color, color, color);
+	int i = int(color * float(step_count));
+	if (i == highlight) {
+		chroma = vec3(0.0, 1.0, 0.0);
+	} else if (i % 2 == 0) {
+		chroma = vec3(0.3, 0.3, 0.3);
+	} else if (i % 2 == 1) {
+		chroma = vec3(0.6, 0.6, 0.6);
+	}
+	chroma *= grid_mask(UV);
+	chroma *= mask(float(inner) / float(pixel_size * 2), 0.5, p);
+	COLOR = vec4(chroma, 1.0);
+	
+}
+
+//void light() {
+//	// Called for every pixel for every light affecting the CanvasItem.
+//	// Uncomment to replace the default light processing function with this one.
+//}