love.graphics.newPixelEffect
Available since LÖVE 0.8.0 and removed in LÖVE 0.9.0
It has been renamed to love.graphics.newShader.
Creates a new PixelEffect object for hardware-accelerated pixel level effects.
A PixelEffect contains at least one function, named effect
, which is the effect itself, but it can contain additional functions.
Function
Synopsis
pixeleffect = love.graphics.newPixelEffect( code )
Arguments
string code
- The pixel effect code.
Returns
PixelEffect pixeleffect
- A PixelEffect object for use in drawing operations.
Effect Language
Pixel effects are not programmed in Lua, but by using a special effect language instead. The effect language is basically GLSL 1.20 (specs) with a few aliases added for existing types:
GLSL | Effect language |
---|---|
float | number |
sampler2D | Image |
uniform | extern |
texture2D(tex, uv) | Texel(tex, uv) |
Effect Function
Synopsis
vec4 effect( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords )
Arguments
vec4 color
- The drawing color set with love.graphics.setColor.
Image texture
- The texture of the image or canvas being drawn.
vec2 texture_coords
- Coordinates of the pixel relative to the texture. The y-axis of canvases are inverted. Coordinates (1,1) would be the top right corner of the canvas.
vec2 screen_coords
- Coordinates of the pixel on the screen. Pixel coordinates are not normalized (unlike texture coordinates). (0.5, 0.5) is the bottom left of the screen.
Returns
vec4 output_color
- The color of the pixel.
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