Generate TGA type 3 test textures using loops

tools/generate_test_textures.lua

@@ -28,46 +28,108 @@ local pixels_colormapped_tb = {
 	{ _, _, _, _, _, B, _, B, },
 }
 
-image_colormapped_bt = tga_encoder.image(pixels_colormapped_bt)
+local pixels_colormapped_by_scanline_order = {
-image_colormapped_tb = tga_encoder.image(pixels_colormapped_tb)
+	["bottom-top"] = pixels_colormapped_bt,
+	["top-bottom"] = pixels_colormapped_tb,
+}
 
-colormap_32bpp = {
+local _ = { 0 }
+local R = { 127 }
+local G = { 255 }
+local B = { 191 }
+
+local pixels_grayscale_bt = {
+	{ _, _, _, _, _, B, _, B, },
+	{ _, _, _, _, _, B, B, B, },
+	{ _, _, G, G, G, B, _, B, },
+	{ _, _, G, _, G, B, B, B, },
+	{ _, R, G, _, _, _, _, _, },
+	{ _, R, G, G, G, _, _, _, },
+	{ _, R, _, _, _, _, _, _, },
+	{ R, R, R, _, _, _, _, _, },
+}
+
+local pixels_grayscale_tb = {
+	{ R, R, R, _, _, _, _, _, },
+	{ _, R, _, _, _, _, _, _, },
+	{ _, R, G, G, G, _, _, _, },
+	{ _, R, G, _, _, _, _, _, },
+	{ _, _, G, _, G, B, B, B, },
+	{ _, _, G, G, G, B, _, B, },
+	{ _, _, _, _, _, B, B, B, },
+	{ _, _, _, _, _, B, _, B, },
+}
+
+local pixels_grayscale_by_scanline_order = {
+	["bottom-top"] = pixels_grayscale_bt,
+	["top-bottom"] = pixels_grayscale_tb,
+}
+
+local colormap_32bpp = {
 	{    0,   0,   0, 128 },
 	{ 255,    0,   0, 255 },
 	{    0, 255,   0, 255 },
 	{    0,   0, 255, 255 },
 }
-image_colormapped_bt:save(
-	"type1_32bpp_bt.tga",
-	{ colormap = colormap_32bpp, color_format = "B8G8R8A8", scanline_order = "bottom-top" }
-)
-image_colormapped_tb:save(
-	"type1_32bpp_tb.tga",
-	{ colormap = colormap_32bpp, color_format = "B8G8R8A8", scanline_order = "top-bottom" }
-)
-image_colormapped_bt:save(
-	"type1_16bpp_bt.tga",
-	{ colormap = colormap_32bpp, color_format = "A1R5G5B5", scanline_order = "bottom-top" }
-)
-image_colormapped_tb:save(
-	"type1_16bpp_tb.tga",
-	{ colormap = colormap_32bpp, color_format = "A1R5G5B5", scanline_order = "top-bottom" }
-)
 
-colormap_24bpp = {
+local colormap_24bpp = {
 	{    0,   0,   0 },
 	{ 255,    0,   0 },
 	{    0, 255,   0 },
 	{    0,   0, 255 },
 }
-image_colormapped_bt:save(
+
-	"type1_24bpp_bt.tga",
+local colormap_16bpp = {
-	{ colormap = colormap_32bpp, color_format = "B8G8R8", scanline_order = "bottom-top" }
+	{    0,   0,   0,   0 },
-)
+	{ 255,    0,   0, 255 },
-image_colormapped_tb:save(
+	{    0, 255,   0, 255 },
-	"type1_24bpp_tb.tga",
+	{    0,   0, 255, 255 },
-	{ colormap = colormap_32bpp, color_format = "B8G8R8", scanline_order = "top-bottom" }
+}
-)
+
+local colormap_by_color_format = {
+	["A1R5G5B5"] = colormap_16bpp,
+	["B8G8R8"]   = colormap_24bpp,
+	["B8G8R8A8"] = colormap_32bpp,
+}
+
+for _, color_format in ipairs(
+	tga_encoder.features.color_format
+) do
+	for _, scanline_order in ipairs(
+		tga_encoder.features.scanline_order
+	) do
+		local filename
+		local pixels
+		if ("Y8" == color_format) then
+			filename = "type3" ..
+				'_' .. color_format ..
+				'_' .. scanline_order ..
+				'.tga'
+			pixels = pixels_grayscale_by_scanline_order[
+				scanline_order
+			]
+		else
+			filename = "type1" ..
+				'_' .. color_format ..
+				'_' .. scanline_order ..
+				'.tga'
+			pixels = pixels_colormapped_by_scanline_order[
+				scanline_order
+			]
+		end
+		local colormap = colormap_by_color_format[
+			color_format
+		]
+		local properties = {
+			colormap = colormap,
+			color_format = color_format,
+			scanline_order = scanline_order,
+		}
+		print(filename)
+		local image = tga_encoder.image(pixels)
+		image:save(filename, properties)
+	end
+end
 
 local _ = {    0,   0,   0, 128 }
 local R = { 255,    0,   0, 255 }