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.

See Also

• love.graphics
• PixelEffect
• love.graphics.setPixelEffect