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src_render_shaders_TextureAtlasShader.ts.html
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<h1 class="file-heading">File: src\render\shaders\TextureAtlasShader.ts</h1>
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<pre class="code prettyprint linenums">
/**
*
* @module Kiwi
* @submodule Shaders
* @namespace Kiwi.Shaders
*/
module Kiwi.Shaders {
/**
* Shader wrapper for rendering Texture Atlases
* @class TextureAtlasShader
* @extends Kiwi.Shaders.ShaderPair
* @constructor
* @namespace Kiwi.Shaders
* @return {Kiwi.Shaders.TextureAtlasShader}
*/
export class TextureAtlasShader extends ShaderPair {
constructor() {
super();
}
/**
* Initialise the shaderPair
* @method init
* @param gl {WebGLRenderingCotext}
* @return {WebGLBuffer}
* @public
*/
public init(gl: WebGLRenderingContext) {
super.init(gl);
this.attributes.aXYUV = gl.getAttribLocation(this.shaderProgram, "aXYUV");
this.attributes.aAlpha = gl.getAttribLocation(this.shaderProgram, "aAlpha");
this.initUniforms(gl);
}
/**
* Shader attribute references
* @property attributes
* @type object
* @public
*/
public attributes: any = {
aXYUV: null,
aAlpha: null,
};
/**
* Shader uniform descriptors
* @property uniforms
* @type object
* @public
*/
public uniforms: any = {
uCamMatrix: {
type: "mat3",
},
uResolution: {
type: "2fv",
},
uTextureSize: {
type: "2fv",
},
uSampler: {
type: "1i",
}
}
/**
* The source for the GLSL fragment shader
* @property fragSource
* @type Array
* @public
*/
public fragSource: Array<string> = [
"precision mediump float;",
"varying vec2 vTextureCoord;",
"varying float vAlpha;",
"uniform sampler2D uSampler;",
"void main(void) {",
"gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.x, vTextureCoord.y));",
"gl_FragColor.a *= vAlpha;",
"}"
];
/**
* The source for the GLSL vertex shader
* @property vertSource
* @type Array
* @public
*/
public vertSource: Array<string> = [
"attribute vec4 aXYUV;",
"attribute float aAlpha;",
"uniform mat3 uCamMatrix;",
"uniform vec2 uResolution;",
"uniform vec2 uTextureSize;",
"varying vec2 vTextureCoord;",
"varying float vAlpha;",
"void main(void) {",
" vec2 pos = (uCamMatrix * vec3(aXYUV.xy,1)).xy; ",
" gl_Position = vec4((pos / uResolution * 2.0 - 1.0) * vec2(1, -1), 0, 1);",
" vTextureCoord = aXYUV.zw / uTextureSize;",
" vAlpha = aAlpha;",
"}"
];
}
}
</pre>
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