func NewDynamicShape(bufSize int) *DynamicShape {
shape := &DynamicShape{}
shape.VBO = gl.CreateBuffer()
gl.BindBuffer(gl.ARRAY_BUFFER, shape.VBO)
gl.BufferInit(gl.ARRAY_BUFFER, bufSize, gl.DYNAMIC_DRAW)
return shape
}
func (line *Line) Reset() {
gl.BindBuffer(gl.ARRAY_BUFFER, line.VBO)
gl.BufferInit(gl.ARRAY_BUFFER, line.bufSize, gl.DYNAMIC_DRAW)
line.height = 1.0
line.step = 3.0 // Per second
line.angle = 0
line.angleBuffer = 0
line.offset = 0
line.direction = mgl.Vec3{1, 0, 1} // angle=0
line.position = mgl.Vec3{0, 0, 0}
line.segments = []mgl.Vec3{line.position}
}
func ParticleEmitter(origin mgl.Vec3, num int, rate float32) Emitter {
bufSize := num * particleLen * vecSize
vbo := gl.CreateBuffer()
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferInit(gl.ARRAY_BUFFER, bufSize, gl.DYNAMIC_DRAW)
return &particleEmitter{
VBO: vbo,
origin: origin,
rate: rate,
particles: make([]*particle, 0, num),
num: num,
}
}