space-crush/space-crush-app/resources/shader/ship/frag.glsl

#version 450 core

#pragma include ./shared.glsl
#pragma include ../misc/glow.glsl
#pragma include ../misc/global.glsl

const float GLOW_ALPHA = 0.20;
const GlowArgs GLOW_ARGS = {
    /* step0      */ 0.100,
    /* step1      */ 0.900,
    /* pulseSize0 */ 0.050,
    /* pulseSize1 */ 0.100,
    /* pulseTime  */ 2.000,
};

     in FragmentData fragmentData;
flat in int          textureId;

uniform sampler2D uTexture[3];

out vec4 outColor;

void main() {
    float alpha     = glow(GLOW_ARGS, fragmentData.texCoords, uGlobal.time);
    vec4  glow      = vec4(fragmentData.color.rgb, fragmentData.color.a * alpha * GLOW_ALPHA);
    vec4  tex       = texture(uTexture[textureId], fragmentData.texCoords / SHIP_SIZE + vec2(0.5));

    outColor = tex * tex.a + glow * (1.0 - tex.a);
}