VoxeLibre/examples.lua

131 lines
4.1 KiB
Lua
Raw Normal View History

2022-05-14 19:56:02 +02:00
dofile("init.lua")
-- encode a bitmap
local _ = { 0, 0, 0 }
local R = { 255, 127, 127 }
local pixels = {
{ _, _, _, _, _, _, _ },
{ _, _, _, R, _, _, _ },
{ _, _, R, R, R, _, _ },
{ _, R, R, R, R, R, _ },
{ _, R, R, R, R, R, _ },
{ _, _, R, _, R, _, _ },
{ _, _, _, _, _, _, _ },
}
tga_encoder.image(pixels):save("bitmap_small.tga")
-- change a single pixel, then rescale the bitmap
local pixels_orig = pixels
pixels_orig[4][4] = { 255, 255, 255 }
local pixels = {}
for x = 1,56,1 do
local x_orig = math.ceil(x/8)
for z = 1,56,1 do
local z_orig = math.ceil(z/8)
local color = pixels_orig[z_orig][x_orig]
pixels[z] = pixels[z] or {}
pixels[z][x] = color
end
end
tga_encoder.image(pixels):save("bitmap_large.tga")
2022-05-14 22:41:52 +02:00
-- note that the uncompressed grayscale TGA file written in this
-- example is 80 bytes but an optimized PNG file is 81 bytes …
local pixels = {}
for x = 1,6,1 do -- left to right
for z = 1,6,1 do -- bottom to top
local color = { math.min(x * z * 4 - 1, 255) }
pixels[z] = pixels[z] or {}
pixels[z][x] = color
end
end
2022-05-16 02:48:51 +02:00
tga_encoder.image(pixels):save("gradient_8bpp_raw.tga", {color_format="Y8", compression="RAW"})
2022-05-14 22:41:52 +02:00
2022-05-14 19:56:02 +02:00
local pixels = {}
for x = 1,16,1 do -- left to right
for z = 1,16,1 do -- bottom to top
local r = math.min(x * 32 - 1, 255)
local g = math.min(z * 32 - 1, 255)
local b = 0
-- blue rectangle in top right corner
if x > 8 and z > 8 then
r = 0
g = 0
b = math.min(z * 16 - 1, 255)
end
local color = { r, g, b }
pixels[z] = pixels[z] or {}
pixels[z][x] = color
end
end
local gradients = tga_encoder.image(pixels)
2022-05-16 02:48:51 +02:00
gradients:save("gradients_8bpp_raw.tga", {color_format="Y8", compression="RAW"})
gradients:save("gradients_16bpp_raw.tga", {color_format="A1R5G5B5", compression="RAW"})
gradients:save("gradients_16bpp_rle.tga", {color_format="A1R5G5B5", compression="RLE"})
gradients:save("gradients_24bpp_raw.tga", {color_format="B8G8R8", compression="RAW"})
gradients:save("gradients_24bpp_rle.tga", {color_format="B8G8R8", compression="RLE"})
2022-05-15 03:10:53 +02:00
2022-05-16 01:39:33 +02:00
for x = 1,16,1 do -- left to right
for z = 1,16,1 do -- bottom to top
local color = pixels[z][x]
color[#color+1] = ((x * x) + (z * z)) % 256
pixels[z][x] = color
end
end
2022-05-16 02:48:51 +02:00
gradients:save("gradients_32bpp_raw.tga", {color_format="B8G8R8A8", compression="RAW"})
2022-05-16 13:16:23 +02:00
-- the RLE-compressed file is larger than just dumping pixels because
-- the gradients in this picture can not be compressed well using RLE
gradients:save("gradients_32bpp_rle.tga", {color_format="B8G8R8A8", compression="RLE"})
2022-05-16 01:39:33 +02:00
2022-05-15 03:10:53 +02:00
local pixels = {}
for x = 1,512,1 do -- left to right
for z = 1,512,1 do -- bottom to top
local oz = (z - 256) / 256 + 0.75
local ox = (x - 256) / 256
local px, pz, i = 0, 0, 0
while (px * px) + (pz * pz) <= 4 and i < 128 do
px = (px * px) - (pz * pz) + oz
pz = (2 * px * pz) + ox
i = i + 1
end
local color = {
math.max(0, math.min(255, math.floor(px * 64))),
math.max(0, math.min(255, math.floor(pz * 64))),
math.max(0, math.min(255, math.floor(i))),
}
pixels[z] = pixels[z] or {}
pixels[z][x] = color
end
end
2022-05-16 02:48:51 +02:00
tga_encoder.image(pixels):save("fractal_8bpp.tga", {color_format="Y8"})
tga_encoder.image(pixels):save("fractal_16bpp.tga", {color_format="A1R5G5B5"})
tga_encoder.image(pixels):save("fractal_24bpp.tga", {color_format="B8G8R8"})
-- encode a colormapped bitmap
local K = { 0 }
local B = { 1 }
local R = { 2 }
local G = { 3 }
local W = { 4 }
local colormap = {
{ 1, 2, 3 }, -- K
{ 0, 0, 255 }, -- B
{ 255, 0, 0 }, -- R
{ 0, 255, 0 }, -- G
{ 253, 254, 255 }, -- W
}
local pixels = {
{ W, K, W, K, W, K, W },
{ R, G, B, R, G, B, K },
{ K, W, K, W, K, W, K },
{ G, B, R, G, B, R, W },
{ W, W, W, K, K, K, W },
{ B, R, G, B, R, G, K },
{ B, R, G, B, R, G, W },
}
-- note that the uncompressed colormapped TGA file written in this
-- example is 108 bytes but an optimized PNG file is 121 bytes …
2022-05-16 18:41:19 +02:00
tga_encoder.image(pixels):save("colormapped_B8G8R8.tga", {colormap=colormap})
-- encoding as A1R5G5B5 saves 1 byte per palette entry → 103 bytes
tga_encoder.image(pixels):save("colormapped_A1R5G5B5.tga", {colormap=colormap, color_format="A1R5G5B5"})