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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

Rev	Line
[db06984]	1	#version 410 core
	2
	3	uniform float elapsed_system_time;
	4
	5	layout (location = 0) in vec3 v_i; // initial velocity
	6	layout (location = 1) in float start_time;
	7
	8	out float opacity;
	9
	10	void 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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