More work on combat

shaders/nonvariant_sprite.gdshader

@@ -0,0 +1,26 @@
+shader_type canvas_item;
+render_mode blend_mix;
+
+uniform bool flash;
+uniform float flash_strength = 0.4;
+uniform vec4 highlight : source_color = vec4(1,1,1,0);
+
+
+void vertex() {
+}
+
+void fragment() {
+	vec4 col = texture(TEXTURE, UV);
+
+	vec4 h = highlight;
+	if(flash){
+		h.a = flash_strength * (sin(TIME * 10.0) + 1.0)/2.0;
+	}
+	//COLOR.r *= col.r;
+	//COLOR.g *= col.g;
+	//COLOR.b *= col.b;
+	COLOR.rgb = mix(COLOR.rgb, h.rgb, h.a);
+	COLOR.a = col.a * COLOR.a;
+
+
+}