isleward/src/client/js/rendering/shaders/outline/vert.js

define([
	
], function (
	
) {
	return `
		attribute vec2 aVertexPosition;

		uniform mat3 projectionMatrix;

		varying vec2 vTextureCoord;

		uniform vec4 inputSize;
		uniform vec4 outputFrame;

		vec4 filterVertexPosition( void )
		{
		    vec2 position = aVertexPosition * max(outputFrame.zw, vec2(0.)) + outputFrame.xy;

		    return vec4((projectionMatrix * vec3(position, 1.0)).xy, 0.0, 1.0);
		}

		vec2 filterTextureCoord( void )
		{
		    return aVertexPosition * (outputFrame.zw * inputSize.zw);
		}

		void main(void)
		{
		    gl_Position = filterVertexPosition();
		    vTextureCoord = filterTextureCoord();
		}
	`;	
});