100 lines
3.0 KiB
Lua
100 lines
3.0 KiB
Lua
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")
|
||
|
||
-- 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
|
||
tga_encoder.image(pixels):save("gradient_8bpp_raw.tga", {color_format="Y8", compression="RAW"})
|
||
|
||
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)
|
||
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"})
|
||
|
||
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
|
||
gradients:save("gradients_32bpp_raw.tga", {color_format="B8G8R8A8", compression="RAW"})
|
||
|
||
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
|
||
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"})
|