Difference between revisions of "love.graphics.newPixelEffect"

(Pixel shaders! Probably needs detail and examples)
 
(Note placement of origin)
 
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{{newin|[[0.8.0]]|080|type=function}}
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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.
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A PixelEffect contains at least one function, named <code>effect</code>, which is the effect itself, but it can contain additional functions.
  
 
== Function ==
 
== Function ==
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</source>
 
</source>
 
=== Arguments ===
 
=== Arguments ===
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{{param|string|code|The GLSL pixel shader code.}}
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{{param|string|code|The pixel effect code.}}
 
=== Returns ===
 
=== Returns ===
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{{param|PixelEffect|pixeleffect|A PixelEffect object containing a GLSL pixel shader.}}
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{{param|PixelEffect|pixeleffect|A PixelEffect object for use in drawing operations.}}
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== Effect Language ==
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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:
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{|cellpadding="5"
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!GLSL               || Effect language
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|-
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|float              || number
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|-
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|sampler2D          || Image
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|-
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|uniform            || extern
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|-
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|texture2D(tex, uv) || Texel(tex, uv)
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|}
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== Effect Function ==
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=== Synopsis ===
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<source lang="glsl">
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vec4 effect( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords )
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</source>
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=== Arguments ===
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{{param|vec4|color|The drawing color set with [[love.graphics.setColor]].}}
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{{param|Image|texture|The texture of the image or canvas being drawn.}}
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{{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.}}
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{{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.}}
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=== Returns ===
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{{param|vec4|output_color|The color of the pixel.}}
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== See Also ==
 
== See Also ==
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* [[love.graphics.setPixelEffect]]
 
* [[love.graphics.setPixelEffect]]
 
[[Category:Functions]]
 
[[Category:Functions]]
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[[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.

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


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More info

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