Gamemaker Studio 2: Cool Shield Shader EASIEST WAY TUTORIAL

Published: 06 May 2021
on channel: GreenCream

954

raising the bar for gamemaker tutorials
// Fragment shader
varying vec2 v_vTexcoord;
varying vec4 v_vColour;

uniform float time;
uniform bool smooth;
uniform float thickness;
uniform float stripes;

void main()
{
float mask = texture2D( gm_BaseTexture, v_vTexcoord ).a;
float pointInTime = 1.0 - texture2D( gm_BaseTexture, v_vTexcoord ).r;

vec4 outColour = vec4(1.0, 1.0, 1.0, 0.0);

if (mask BIGGER_THAN 0.0) {
float _distance = abs(mod(pointInTime * stripes, 1.0) - mod(time, 1.0)) * 2.0;
if (_distance BIGGER_THAN 1.0) {
_distance = 1.0 - (_distance - 1.0);
}

float _distance2 = _distance / stripes;

if (_distance2 SMALLER_THAN thickness) {
float _normalizedDistance = (_distance2 / thickness);
float _alpha = smooth ? (1.0 - _normalizedDistance) : 1.0;

outColour.a = _alpha;
}
}

gl_FragColor = v_vColour * outColour;
}

// utility script:
function shader_set_shield(time, smooth, thickness, stripes){
var uni_time = shader_get_uniform(Shader1, "time");
var uni_smooth = shader_get_uniform(Shader1, "smooth");
var uni_thickness = shader_get_uniform(Shader1, "thickness");
var uni_stripes = shader_get_uniform(Shader1, "stripes");

shader_set(Shader1);

shader_set_uniform_f(uni_time, time);
shader_set_uniform_i(uni_smooth, smooth);
shader_set_uniform_f(uni_thickness, thickness);
shader_set_uniform_f(uni_stripes, stripes);
}

// how to use example:
shader_set_shield((current_time * 0.0005), true, 0.1, 3.33);
draw_self();
shader_reset();

00:00 - intro
0:27 - tldw version
0:44 - impress your friends (with lyrics)
2:21 - features
2:50 - bonus blender tutorial for making a shield gradient
3:24 - implementing for noob
4:38 - uniform time bb
6:08 - mask out the stripes
10:03 - how to loop it gorgeously
10:42 - how to multiple stripes
12:07 - making it convenient for later (since you will forget everything)
13:17 - ok wow that was easy

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