func NewRenderer(bufferSize int) (r *Renderer, err error) {
var (
instance renderInstance
instanceStride = unsafe.Sizeof(instance)
)
r = &Renderer{
shader: core.NewProgram(),
bufferSize: bufferSize,
buffer: make([]renderInstance, bufferSize),
stride: instanceStride,
}
if err = r.shader.Load(VERTEX, FRAGMENT); err != nil {
return
}
r.shader.Bind()
r.vbo = core.NewArrayBuffer()
r.shader.Attrib("f_InstanceFrame", instanceStride).Float(unsafe.Offsetof(instance.frame), 1)
r.shader.Attrib("m_Model", instanceStride).Mat4(unsafe.Offsetof(instance.model), 1)
r.shader.Attrib("v_Color", instanceStride).Vec4(unsafe.Offsetof(instance.color), 1)
r.textureData = r.shader.UniformBlock("TextureData", 1)
r.uView = r.shader.Uniform("m_View")
r.uProj = r.shader.Uniform("m_Projection")
if e := gl.GetError(); e != 0 {
err = fmt.Errorf("ERROR: OpenGL error %X", e)
}
return
}
func NewGeometry(capacity int) (out *Geometry) {
var (
point Point
stride uintptr = unsafe.Sizeof(point)
)
out = &Geometry{
Points: make([]Point, 0, capacity),
Dirty: true,
stride: stride,
vbo: core.NewArrayBuffer(),
}
return
}
