source: opengl-game/explosion.vert@ db06984

feature/imgui-sdl points-test
Last change on this file since db06984 was db06984, checked in by Dmitry Portnoy <dmp1488@…>, 6 years ago

Create a particle system that will later be used to render exploding asteroids
  • Property mode set to 100644
File size: 537 bytes
Line 
1#version 410 core
2
3uniform float elapsed_system_time;
4
5layout (location = 0) in vec3 v_i; // initial velocity
6layout (location = 1) in float start_time;
7
8out float opacity;
9
10void main() {
11 float t = elapsed_system_time - start_time;
12 t = mod(t, 3.0); // allow time to loop around so particle emitter keeps going
13
14 vec3 p = vec3(0.0, 0.0, 0.0);
15 vec3 a = vec3(0.0, -1.0, 0.0); // gravity
16 p += v_i * t + 0.5 * a * t * t;
17
18 opacity = 1.0 - (t / 3.0);
19
20 gl_Position = vec4(p, 1.0);
21 gl_PointSize = 15.0; // size in pixels
22}
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