@phaserjs/phaser/renderer/webgl1/glsl/SINGLE_QUAD_FRAG.js

Phaser 4

export const SINGLE_QUAD_FRAG = `#define SHADER_NAME SINGLE_QUAD_FRAG

precision highp float;

varying vec2 vTextureCoord;
varying float vTextureId;
varying vec4 vTintColor;

uniform sampler2D uTexture;
uniform mat4 uColorMatrix;
uniform vec4 uColorOffset;

void main (void)
{
    vec4 color = texture2D(uTexture, vTextureCoord);

    //  Un pre-mult alpha
    if (color.a > 0.0)
    {
        color.rgb /= color.a;
    }

    vec4 result = color * uColorMatrix + (uColorOffset / 255.0);

    //  Pre-mult alpha
    result.rgb *= result.a;

    gl_FragColor = vec4(result.rgb, result.a);
}`;