Difference between revisions of "love.graphics.newPixelEffect"
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| − | {{ | + | {{newinoldin|[[0.8.0]]|080|[[0.9.0]]|090|type=function|text=It has been renamed to [[love.graphics.newShader]]}} |
Creates a new PixelEffect object for hardware-accelerated pixel level effects. | Creates a new PixelEffect object for hardware-accelerated pixel level effects. | ||
| + | |||
| + | A PixelEffect contains at least one function, named <code>effect</code>, which is the effect itself, but it can contain additional functions. | ||
== Function == | == Function == | ||
| Line 11: | Line 13: | ||
=== Returns === | === Returns === | ||
{{param|PixelEffect|pixeleffect|A PixelEffect object for use in drawing operations.}} | {{param|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 [http://www.opengl.org/sdk/docs/manglsl/ GLSL 1.20] ([http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.20.8.pdf specs]) with a few aliases added for existing types: | ||
| + | |||
| + | {|cellpadding="5" | ||
| + | !GLSL || Effect language | ||
| + | |- | ||
| + | |float || number | ||
| + | |- | ||
| + | |sampler2D || Image | ||
| + | |- | ||
| + | |uniform || extern | ||
| + | |- | ||
| + | |texture2D(tex, uv) || Texel(tex, uv) | ||
| + | |} | ||
| + | |||
| + | == Effect Function == | ||
| + | === Synopsis === | ||
| + | <source lang="glsl"> | ||
| + | vec4 effect( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords ) | ||
| + | </source> | ||
| + | === Arguments === | ||
| + | {{param|vec4|color|The drawing color set with [[love.graphics.setColor]].}} | ||
| + | {{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|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 === | ||
| + | {{param|vec4|output_color|The color of the pixel.}} | ||
| + | |||
== See Also == | == See Also == | ||
| Line 17: | Line 48: | ||
* [[love.graphics.setPixelEffect]] | * [[love.graphics.setPixelEffect]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
| + | [[Sub-Category::Object Creation| ]] | ||
{{#set:Description=Creates a new [[PixelEffect]].}} | {{#set:Description=Creates a new [[PixelEffect]].}} | ||
== Other Languages == | == Other Languages == | ||
{{i18n|love.graphics.newPixelEffect}} | {{i18n|love.graphics.newPixelEffect}} | ||
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.
See Also
Other Languages
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