Difference between revisions of "love.graphics.newPixelEffect"
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Creates a new PixelEffect object for hardware-accelerated pixel level effects. | Creates a new PixelEffect object for hardware-accelerated pixel level effects. | ||
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{{param|Image|texture|The texture of the image or canvas being drawn.}} | {{param|Image|texture|The texture of the image or canvas being drawn.}} | ||
{{param|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.}} | {{param|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.}} | ||
| − | {{param|vec2|screen_coords|Coordinates of the pixel on the screen. Pixel coordinates are not normalized (unlike texture coordinates)}} | + | {{param|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 === | === Returns === | ||
{{param|vec4|output_color|The color of the pixel.}} | {{param|vec4|output_color|The color of the pixel.}} | ||
Latest revision as of 21:50, 27 October 2016
| 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.
Contents
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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