gltut / Tut 02 OpenGLs Moving Triangle / data / tut2d.vert

#version 150

in vec4 position;
uniform float loopDuration;
uniform float time;

void main()
{
	float timeScale = 3.14159f * 2.0f / loopDuration;
	
	float currTime = mod(time, loopDuration);
	vec4 totalOffset = vec4(
		cos(currTime * timeScale) * 0.5f,
		sin(currTime * timeScale) * 0.5f,
		0.0f,
		0.0f);

	gl_Position = position + totalOffset;
}
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