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

#version 450 core

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

const GlowArgs GLOW_ARGS = {
    /* step0      */ 0.480,
    /* step1      */ 0.975,
    /* pulseSize0 */ 0.010,
    /* pulseSize1 */ 0.050,
    /* pulseTime  */ 2.000,
};

     in FragmentData fragmentData;
flat in int          textureId;

uniform sampler2D uTexture[2];

out vec4 outColor;

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

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