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glsl-blend

1.0.3 • Public • Published

glsl-blend

Photoshop blending modes in glsl for use with glslify. Blending modes include Screen, Multiply, Soft Light, Vivid Light, Overlay, etc. Implementations sourced from this article on Photoshop math.

Demo

http://jamieowen.github.io/glsl-blend

Installation

npm install glsl-blend

NPM

stable

Standard Usage

Blend modes can be imported individually using the standard glslify preprocessor syntax.

#pragma glslify: blendAdd require(glsl-blend/add) 
#pragma glslify: blendAverage require(glsl-blend/average) 
#pragma glslify: blendColorBurn require(glsl-blend/color-burn) 
#pragma glslify: blendColorDodge require(glsl-blend/color-dodge) 
#pragma glslify: blendDarken require(glsl-blend/darken) 
#pragma glslify: blendDifference require(glsl-blend/difference) 
#pragma glslify: blendExclusion require(glsl-blend/exclusion) 
#pragma glslify: blendGlow require(glsl-blend/glow) 
#pragma glslify: blendHardLight require(glsl-blend/hard-light) 
#pragma glslify: blendHardMix require(glsl-blend/hard-mix) 
#pragma glslify: blendLighten require(glsl-blend/lighten) 
#pragma glslify: blendLinearBurn require(glsl-blend/linear-burn) 
#pragma glslify: blendLinearDodge require(glsl-blend/linear-dodge) 
#pragma glslify: blendLinearLight require(glsl-blend/linear-light) 
#pragma glslify: blendMultiply require(glsl-blend/multiply) 
#pragma glslify: blendNegation require(glsl-blend/negation) 
#pragma glslify: blendNormal require(glsl-blend/normal) 
#pragma glslify: blendOverlay require(glsl-blend/overlay) 
#pragma glslify: blendPhoenix require(glsl-blend/phoenix) 
#pragma glslify: blendPinLight require(glsl-blend/pin-light) 
#pragma glslify: blendReflect require(glsl-blend/reflect) 
#pragma glslify: blendScreen require(glsl-blend/screen) 
#pragma glslify: blendSoftLight require(glsl-blend/soft-light) 
#pragma glslify: blendSubtract require(glsl-blend/subtract) 
#pragma glslify: blendVividLight require(glsl-blend/vivid-light) 

A foreground and background color is needed to perform a blend operation.

#pragma glslify: blend require(glsl-blend/screen) 
 
void main() {
    vec4 bgColor = texture2D(bg, vUv);
    vec4 fgColor = texture2D(foreground, vUv);
 
    vec3 color = blend(bgColor.rgb, fgColor.rgb);
    gl_FragColor = vec4(color, 1.0);
}

Blend modes can also specify an additional opacity parameter.

float opacity = 0.75;
vec3 color = blend(bgColor.rgb, fgColor.rgb, opacity );

Modal Usage

The demo shows all blend modes switchable via a drop down.

For this, there is an additional 'all' glsl function that can be required to import all blend mode functions at once and specify which one to use via an integer. Integers for each blend mode can be imported using the javascript modes module, and passed as a uniform to the shader.

// javascript
var modes = require( 'glsl-blend/modes' );
 
// using stackgl
myShader.uniforms.blendMode = modes.HARD_LIGHT;
// glsl 
#pragma glslify: blend require(glsl-blend/all) 
uniform int blendMode;
 
// ... 
 
vec3 color = blend( blendMode, bgColor.rgb, fgColor.rgb0.75 );

Todo

  • Add Hue, Luminance, Saturation & Color Modes.
  • Implement color conversion functions for the above as separate glsl modules.

Contributing

See stackgl/contributing.

License

MIT. See LICENSE.md for details.

Keywords

none

install

npm i glsl-blend

Downloadsweekly downloads

92

version

1.0.3

license

MIT

homepage

github.com

repository

Gitgithub

last publish

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