79 lines
1.7 KiB
Markdown
79 lines
1.7 KiB
Markdown
# glsl-inject-defines
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[](http://github.com/badges/stability-badges)
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Safely inject `#define` statements into a shader source.
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If the shader contains any `#version` or `#extension` statements, the defines are added after them.
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## Example
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```glsl
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// Your cool shader
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#version 330
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#extension GL_OES_standard_derivatives : enable
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void main() {
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#ifdef BLUE
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gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0);
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#else
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gl_FragColor = vec4(0.0);
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#endif
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}
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```
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You can process it at runtime, like so:
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```js
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var injectDefines = require('glsl-inject-defines')
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var fs = require('fs')
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var source = fs.readFileSync(__dirname + '/shader.glsl', 'utf8')
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var transformed = injectDefines(source, {
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PI: 3.14,
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BLUE: ''
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})
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console.log(transformed)
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```
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The resulting shader:
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```glsl
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// Your cool shader
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#version 330
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#extension GL_OES_standard_derivatives : enable
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#define PI 3.14
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#define BLUE
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void main() {
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#ifdef BLUE
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gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0);
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#else
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gl_FragColor = vec4(0.0);
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#endif
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}
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```
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Works in the browser with browserify and [glslify](https://www.npmjs.com/package/glslify).
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## Install
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```sh
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npm install glsl-inject-defines
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```
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## Usage
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[](https://www.npmjs.com/package/glsl-inject-defines)
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#### `newSource = injectDefines(source, defines)`
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Injects the set of `defines`, an object with `<name, value>` pairs that will get turned into strings for the shader source.
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Returns the transformed source, with defines injected after extension and version statements.
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## License
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MIT. See [LICENSE.md](http://github.com/stackgl/glsl-inject-defines/blob/master/LICENSE.md) for details.
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