Setting for laser patterns (for colorblindness)

mods/lzr_laser/laser.lua

@@ -1,22 +1,79 @@
 local S = minetest.get_translator("lzr_laser")
 
+-- List of laser hex codes. Affects the actual laser color in the game!
+lzr_laser.DEFAULT_LASER_COLORS = {
+	[lzr_globals.COLOR_RED] = "#FF0000",
+	[lzr_globals.COLOR_GREEN] = "#00FF00",
+	[lzr_globals.COLOR_BLUE] = "#0000FF",
+	[lzr_globals.COLOR_YELLOW] = "#FFFF00",
+	[lzr_globals.COLOR_CYAN] = "#00FFFF",
+	[lzr_globals.COLOR_MAGENTA] = "#FF00FF",
+	[lzr_globals.COLOR_WHITE] = "#FFFFFF",
+}
+
+-- List of patterns to apply on lasers to distinguish them by some other
+-- way than just color. Implemented to deal with colorblindness.
+local LASER_PATTERNS = {
+	[lzr_globals.COLOR_RED] = nil, -- no pattern, use a solid line
+	[lzr_globals.COLOR_GREEN] = { name = "lzr_laser_pattern_lines.png", size = 16 },
+	[lzr_globals.COLOR_BLUE] = { name = "lzr_laser_pattern_dots.png", size = 16 },
+	[lzr_globals.COLOR_YELLOW] = { name = "lzr_laser_pattern_checkers.png", size = 16 },
+	[lzr_globals.COLOR_CYAN] = { name = "lzr_laser_pattern_long_checkers.png", size = 16 },
+	[lzr_globals.COLOR_MAGENTA] = { name = "lzr_laser_pattern_alternating.png", size = 16 },
+	[lzr_globals.COLOR_WHITE] = { name = "lzr_laser_pattern_holes.png", size = 32 },
+}
+
+
+-- Hex alpha value for translucent lasers, as a string
+local LALPHA = "EE"
+
+
+-- Shorthand to generate a laser tile. We don't use texture files,
+-- we generate them on the fly!
+local maketile = function(colorcode, alpha)
+	local use_patterns = minetest.settings:get_bool("lzr_patterned_lasers", false)
+	local alpha_append = ""
+	local pattern_append = ""
+	if alpha then
+		alpha_append = LALPHA
+	end
+	local texsize = 16
+	if use_patterns then
+		local pattern = LASER_PATTERNS[colorcode]
+		if pattern ~= nil then
+			pattern_append = "^[mask:"..pattern.name
+			texsize = pattern.size
+		end
+	end
+	local texture = 
+		-- Generate the texture base color
+		"([fill:"..texsize.."x"..texsize..":"..
+			lzr_laser.DEFAULT_LASER_COLORS[colorcode]..alpha_append..")"
+		-- Apply a pattern on the laser, if enabled (allows to distinguish
+		-- lasers other than by color to circumvent colorblindness)
+		.. pattern_append
+
+	return { name = texture, backface_culling = true }
+end
+
+-- List of all possible laser tiles
 if lzr_globals.OPAQUE_LASERS then
-	lzr_laser.TILE_LASER_R = { name = "lzr_laser_laser_opaque.png", backface_culling = true }
-	lzr_laser.TILE_LASER_G = { name = "lzr_laser_laser_green_opaque.png", backface_culling = true }
-	lzr_laser.TILE_LASER_B = { name = "lzr_laser_laser_blue_opaque.png", backface_culling = true }
-	lzr_laser.TILE_LASER_Y = { name = "lzr_laser_laser_yellow_opaque.png", backface_culling = true }
-	lzr_laser.TILE_LASER_C = { name = "lzr_laser_laser_cyan_opaque.png", backface_culling = true }
-	lzr_laser.TILE_LASER_M = { name = "lzr_laser_laser_magenta_opaque.png", backface_culling = true }
-	lzr_laser.TILE_LASER_W = { name = "lzr_laser_laser_white_opaque.png", backface_culling = true }
+	lzr_laser.TILE_LASER_R = maketile(lzr_globals.COLOR_RED)
+	lzr_laser.TILE_LASER_G = maketile(lzr_globals.COLOR_GREEN)
+	lzr_laser.TILE_LASER_B = maketile(lzr_globals.COLOR_BLUE)
+	lzr_laser.TILE_LASER_Y = maketile(lzr_globals.COLOR_YELLOW)
+	lzr_laser.TILE_LASER_C = maketile(lzr_globals.COLOR_CYAN)
+	lzr_laser.TILE_LASER_M = maketile(lzr_globals.COLOR_MAGENTA)
+	lzr_laser.TILE_LASER_W = maketile(lzr_globals.COLOR_WHITE)
 	lzr_laser.ALPHA_LASER = "clip"
 else
-	lzr_laser.TILE_LASER_R = { name = "lzr_laser_laser.png", backface_culling = true }
-	lzr_laser.TILE_LASER_G = { name = "lzr_laser_laser_green.png", backface_culling = true }
-	lzr_laser.TILE_LASER_B = { name = "lzr_laser_laser_blue.png", backface_culling = true }
-	lzr_laser.TILE_LASER_Y = { name = "lzr_laser_laser_yellow.png", backface_culling = true }
-	lzr_laser.TILE_LASER_C = { name = "lzr_laser_laser_cyan.png", backface_culling = true }
-	lzr_laser.TILE_LASER_M = { name = "lzr_laser_laser_magenta.png", backface_culling = true }
-	lzr_laser.TILE_LASER_W = { name = "lzr_laser_laser_white.png", backface_culling = true }
+	lzr_laser.TILE_LASER_R = maketile(lzr_globals.COLOR_RED, true)
+	lzr_laser.TILE_LASER_G = maketile(lzr_globals.COLOR_GREEN, true)
+	lzr_laser.TILE_LASER_B = maketile(lzr_globals.COLOR_BLUE, true)
+	lzr_laser.TILE_LASER_Y = maketile(lzr_globals.COLOR_YELLOW, true)
+	lzr_laser.TILE_LASER_C = maketile(lzr_globals.COLOR_CYAN, true)
+	lzr_laser.TILE_LASER_M = maketile(lzr_globals.COLOR_MAGENTA, true)
+	lzr_laser.TILE_LASER_W = maketile(lzr_globals.COLOR_WHITE, true)
 	lzr_laser.ALPHA_LASER = "blend"
 end
 

settingtypes.txt

@@ -1,6 +1,12 @@
 # If true, laser beams are opaque instead of translucent.
 lzr_opaque_lasers (Opaque lasers) bool false
 
+# If true, each laser color will be represented by an unique pattern
+# so they can be distinguished not just by color alone.
+# If false, lasers will be flat and smooth.
+# This should be helpful in case of colorblindness.
+lzr_patterned_lasers (Represent laser colors by patterns [colorblind support]) bool false
+
 # If true, background ambience sounds will be played.
 # Note: You can always toggle ambience sounds in-game with the '/ambience' command.
 lzr_ambience_start_with_ambience (Ambience sounds) bool true