init

src/lib/shaders/poly_shadow.glsl

@@ -0,0 +1,41 @@
+#define PI 3.1415926535897932384626433832795
+
+extern vec3 lightPosition;
+extern vec3 lightColor;
+extern float lightRange;
+extern float lightSmooth;
+extern vec2 lightGlow;
+extern float lightDirection;
+extern float lightAngle;
+
+vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords){
+	vec4 pixel = Texel(texture, texture_coords);
+	vec3 lightToPixel = vec3(pixel_coords.x, pixel_coords.y, 0.0) - lightPosition;
+	float distance = length(lightToPixel);
+	float att = 1 - distance / lightRange;
+
+	if(lightAngle > 0.0) {
+		float angle2 = atan(lightPosition.x - pixel_coords.x, pixel_coords.y - lightPosition.y) + PI;
+		if(lightDirection - lightAngle > 0 && lightDirection + lightAngle < PI * 2) {
+			if(angle2 < mod(lightDirection + lightAngle, PI * 2) && angle2 > mod(lightDirection - lightAngle, PI * 2)) {
+				return vec4(0.0, 0.0, 0.0, 1.0);
+			}
+		} else {
+			if(angle2 < mod(lightDirection + lightAngle, PI * 2) || angle2 > mod(lightDirection - lightAngle, PI * 2)) {
+				return vec4(0.0, 0.0, 0.0, 1.0);
+			}
+		}
+	}
+
+	if (distance <= lightRange) {
+		if (lightGlow.x < 1.0 && lightGlow.y > 0.0) {
+			pixel.rgb = clamp(lightColor * pow(att, lightSmooth) + pow(smoothstep(lightGlow.x, 1.0, att), lightSmooth) * lightGlow.y, 0.0, 1.0);
+		} else {
+			pixel.rgb = lightColor * pow(att, lightSmooth);
+		}
+	} else {
+		return vec4(0.0, 0.0, 0.0, 1.0);
+	}
+
+	return pixel;
+}