Alpha channel support, don't use inventory cubes

Add alpha channel support for latest git clients/servers
(should still work fine on old clients/servers too).

Requires that the client use shaders to see the effect.

Also, removes the calls that create rendered inventory cubes - those
calls are obsolete and should not be used in production, as they prevent
the engine from rendering an actual cube when an item is dropped.

init.lua

@@ -144,9 +144,9 @@ for h = 1, 12 do
 				description = "Stained Glass - " .. bright .. hues .. sat,
 				drawtype = "glasslike",
 				tiles = {"stained_glass_" .. bright .. hues .. sat .. ".png"},
-				inventory_image = minetest.inventorycube("stained_glass_" .. bright .. hues .. sat .. ".png"),
 				paramtype = "light",
 				sunlight_propagates = true,
+				use_texture_alpha = true,
 				light_source = 14,
 				is_ground_content = true,
 				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
@@ -187,9 +187,9 @@ for h = 1, 12 do
 				description = "Stained Glass - light_" .. hues,
 				drawtype = "glasslike",
 				tiles = {"stained_glass_light_" .. hues .. ".png"},
-				inventory_image = minetest.inventorycube("stained_glass_light_" .. hues .. ".png"),
 				paramtype = "light",
 				sunlight_propagates = true,
+				use_texture_alpha = true,
 				light_source = 14,
 				is_ground_content = true,
 				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
@@ -231,9 +231,9 @@ for h = 1, 12 do
 				description = "Stained Glass - pastel_" .. hues,
 				drawtype = "glasslike",
 				tiles = {"stained_glass_pastel_" .. hues .. ".png"},
-				inventory_image = minetest.inventorycube("stained_glass_pastel_" .. hues .. ".png"),
 				paramtype = "light",
 				sunlight_propagates = true,
+				use_texture_alpha = true,
 				light_source = 14,
 				is_ground_content = true,
 				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
@@ -276,9 +276,9 @@ for h = 1, 12 do
 				description = "Stained Glass - faint_" .. hues,
 				drawtype = "glasslike",
 				tiles = {"stained_glass_faint_" .. hues .. ".png"},
-				inventory_image = minetest.inventorycube("stained_glass_faint_" .. hues .. ".png"),
 				paramtype = "light",
 				sunlight_propagates = true,
+				use_texture_alpha = true,
 				light_source = 14,
 				is_ground_content = true,
 				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},

init.lua~

@@ -0,0 +1,299 @@
+--[[
+
+Stained Glass 1.1
+
+This mod provides luminescent stained glass blocks for Minetest 0.4.x.
+
+Depends:
+[moreblocks] by Calinou
+[unifieddyes] by VanessaE
+
+==============================================================================
+Sun 24 Feb 2013 11:52:27 AM EST    
+
+Copyright (C) 2013, Eli Innis
+Email: doyousketch2 @ yahoo.com
+
+Unified Dyes was released under GNU-GPL 2.0, see LICENSE for info.
+More Blocks was released under zlib/libpng for code and CC BY-SA 3.0 Unported for textures, see LICENSE.txt for info.
+
+==============================================================================
+
+
+Recipe for standard colors:
+
+dye
+super glow glass
+super glow glass
+super glow glass
+
+
+Recipe for pastel colors:
+
+light dye
+white paint
+super glow glass
+super glow glass
+super glow glass
+
+
+Recipe for faint colors:
+
+light dye
+white paint
+white paint
+super glow glass
+super glow glass
+super glow glass
+
+
+All recipes produce three glowing stained glass blocks.
+Pastel blocks give back an empty bucket.
+Faint blocks give back two empty buckets.
+
+==============================================================================
+]]--
+
+
+-- HUES includes all colors for the various shades
+--  I'm trying to get it to sort by color in the game, tho it sorts alpha-numerically...
+--   so with 12 colors, it's sorting 10, 11, 12, 1, 2, 3, 4...
+
+HUES = {
+	"yellow",
+	"lime",
+	"green",
+	"aqua",
+	"cyan",
+	"skyblue",
+	"blue",
+	"violet",
+	"magenta",
+	"redviolet",
+	"red",
+	"orange"
+}
+
+
+-- Brightness levels in the textures are 33% ("dark"), 66% ("medium"),
+-- 100% ("full"), 150% ("light"), 200% ("pastel").
+-- 1x and 2x are simply placeholders to fill in so numbers start at 3.
+
+BRIGHT = {
+	"1x",
+	"2x",
+	"dark_",
+	"medium_",
+	"",		--(full)
+}
+
+
+-- Saturation - "s50" in a file/item name means "saturation: 50%".
+-- 1x - 5x are simply placeholders so numbers start at 6.
+
+
+SAT = {
+	"1x",
+	"2x",
+	"3x",
+	"4x",
+	"5x",
+	"_s50",
+	""	--(full)
+}
+
+
+--main loop for all 12 hues
+
+for h = 1, 12 do
+
+	hues = HUES[h]
+
+
+	--nested loop for brightness
+	--starts at 3 to hopefully keep colors in order
+
+	for b = 3, 5 do
+
+	bright = BRIGHT[b]
+
+
+		--sub loop for saturation
+		--starts at 6 to keep colors in order
+		for s = 6, 7 do
+
+			sat = SAT[s]
+
+
+				--register recipes
+
+				minetest.register_craft({
+				type = "shapeless",
+				output = "stained_glass:" .. (h) .. "_" .. (b) .. "_" .. (s) .." 3",
+				recipe = {
+					"unifieddyes:" .. bright .. hues .. sat,
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					},
+				})
+
+				--register item attributes
+
+				minetest.register_node("stained_glass:" .. (h) .. "_" .. (b) .. "_" .. (s), {
+				description = "Stained Glass - " .. bright .. hues .. sat,
+				drawtype = "glasslike",
+				tiles = {"stained_glass_" .. bright .. hues .. sat .. ".png"},
+				inventory_image = minetest.inventorycube("stained_glass_" .. bright .. hues .. sat .. ".png"),
+				paramtype = "light",
+				sunlight_propagates = true,
+				use_texture_alpha = true,
+				light_source = 14,
+				is_ground_content = true,
+				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
+				sounds = default.node_sound_glass_defaults()
+				})
+		end  --sat
+
+	end  --bright
+
+end  --hues
+
+
+--secondary loop for light blocks 
+--(as they don't have 50% saturation blocks to go along with 'em)
+
+
+for h = 1, 12 do
+
+
+	hues = HUES[h]
+
+				--register recipes (set at 8 to keep colors in order)
+
+				minetest.register_craft({
+				type = "shapeless",
+				output = "stained_glass:" .. (h) .. "_8 3",
+				recipe = {
+					"unifieddyes:light_" .. hues,
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					},
+				})
+
+				--register item attributes
+
+				minetest.register_node("stained_glass:" .. (h) .. "_8_", {
+				description = "Stained Glass - light_" .. hues,
+				drawtype = "glasslike",
+				tiles = {"stained_glass_light_" .. hues .. ".png"},
+				inventory_image = minetest.inventorycube("stained_glass_light_" .. hues .. ".png"),
+				paramtype = "light",
+				sunlight_propagates = true,
+				use_texture_alpha = true,
+				light_source = 14,
+				is_ground_content = true,
+				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
+				sounds = default.node_sound_glass_defaults()
+				})
+
+
+end  --hues
+
+
+--third loop for pastel blocks 
+--(as they don't have 50% saturation blocks to go along with 'em)
+--(plus they have a diff recipe to create.)
+
+
+for h = 1, 12 do
+
+
+	hues = HUES[h]
+
+				--register recipes (set at 9 to keep colors in order)
+
+				minetest.register_craft({
+				type = "shapeless",
+				output = "stained_glass:" .. (h) .. "_9 3",
+				recipe = {
+					"unifieddyes:white_paint",
+					"unifieddyes:light_" .. hues,
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					},
+					replacements = { {'unifieddyes:white_paint', 'bucket:bucket_empty'}, },
+				})
+
+				--register item attributes
+
+				minetest.register_node("stained_glass:" .. (h) .. "_9", {
+				description = "Stained Glass - pastel_" .. hues,
+				drawtype = "glasslike",
+				tiles = {"stained_glass_pastel_" .. hues .. ".png"},
+				inventory_image = minetest.inventorycube("stained_glass_pastel_" .. hues .. ".png"),
+				paramtype = "light",
+				sunlight_propagates = true,
+				use_texture_alpha = true,
+				light_source = 14,
+				is_ground_content = true,
+				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
+				sounds = default.node_sound_glass_defaults()
+				})
+
+
+end  --hues
+
+
+--last loop for faint blocks 
+--(as they don't have 50% saturation blocks to go along with 'em)
+--(plus they have a diff recipe to create.)
+
+
+for h = 1, 12 do
+
+
+	hues = HUES[h]
+
+				--register recipes (set at 91 to keep colors in order)
+
+				minetest.register_craft({
+				type = "shapeless",
+				output = "stained_glass:" .. (h) .. "_91 3",
+				recipe = {
+					"unifieddyes:white_paint",
+					"unifieddyes:white_paint",
+					"unifieddyes:light_" .. hues,
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					"moreblocks:superglowglass",
+					},
+					replacements = { {'unifieddyes:white_paint', 'bucket:bucket_empty 2'}, },
+				})
+
+				--register item attributes
+
+				minetest.register_node("stained_glass:" .. (h) .. "_91", {
+				description = "Stained Glass - faint_" .. hues,
+				drawtype = "glasslike",
+				tiles = {"stained_glass_faint_" .. hues .. ".png"},
+				inventory_image = minetest.inventorycube("stained_glass_faint_" .. hues .. ".png"),
+				paramtype = "light",
+				sunlight_propagates = true,
+				use_texture_alpha = true,
+				light_source = 14,
+				is_ground_content = true,
+				groups = {snappy=2,cracky=3,oddly_breakable_by_hand=3},
+				sounds = default.node_sound_glass_defaults()
+				})
+
+
+end  --hues
+
+
+print("[stained_glass] Loaded!")
+
+
+