func NewDynamicShape(glctx gl.Context, bufSize int) *DynamicShape {
shape := &DynamicShape{StaticShape{glctx: glctx}}
shape.VBO = glctx.CreateBuffer()
glctx.BindBuffer(gl.ARRAY_BUFFER, shape.VBO)
glctx.BufferInit(gl.ARRAY_BUFFER, bufSize, gl.DYNAMIC_DRAW)
return shape
}
func ParticleEmitter(glctx gl.Context, origin mgl.Vec3, num int, rate float32) Emitter {
bufSize := num * particleLen * vecSize
vbo := glctx.CreateBuffer()
glctx.BindBuffer(gl.ARRAY_BUFFER, vbo)
glctx.BufferInit(gl.ARRAY_BUFFER, bufSize, gl.DYNAMIC_DRAW)
return &particleEmitter{
glctx: glctx,
VBO: vbo,
origin: origin,
rate: rate,
particles: make([]*particle, 0, num),
num: num,
}
}