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

Phaser 4

export const PHONG_TEXTURE_FRAG = `#define SHADER_NAME phong_texture_frag

precision highp float;

uniform float uShininess;
uniform vec3 uLightDirection;

uniform vec4 uLightAmbient;
uniform vec4 uLightDiffuse;
uniform vec4 uLightSpecular;

uniform vec4 uMaterialAmbient;
uniform vec4 uMaterialDiffuse;
uniform vec4 uMaterialSpecular;

varying vec3 vNormal;
varying vec3 vEyeVec;
varying vec4 vColor;

void main(void)
{
    vec3 L = normalize(uLightDirection);
    vec3 N = normalize(vNormal);

    float lambertTerm = dot(N, -L);

    vec4 Ia = uLightAmbient * uMaterialAmbient;
    vec4 Id = vec4(0.0, 0.0, 0.0, 1.0);
    vec4 Is = vec4(0.0, 0.0, 0.0, 1.0);

    if (lambertTerm > 0.0)
    {
        Id = uLightDiffuse * vColor * lambertTerm;

        vec3 E = normalize(vEyeVec);
        vec3 R = reflect(L, N);

        float specular = pow(max(dot(R, E), 0.0), uShininess);

        Is = uLightSpecular * uMaterialSpecular * specular;
    }

    vec4 finalColor = Ia + Id + Is;

    finalColor.a = 1.0;

    gl_FragColor = finalColor;
}
`;