func NewRenderable(verts []float32) *Renderable {
r := &Renderable{
VboPosition: G.Renderer.NewVboPosition(verts),
Length: len(verts),
}
gl.BindBuffer(gl.ARRAY_BUFFER, r.VboPosition.Vbo.Id)
gl.BufferSubData(gl.ARRAY_BUFFER, int(r.VboPosition.Index*4), len(verts)*4, gl.Ptr(verts))
return r
}
func (buffer *Buffer) Update(offset int, idata interface{}) {
data, err := resolveData(idata)
if err != nil {
panic(err)
}
if data.typ != buffer.data.typ {
panic(fmt.Errorf("buffer data type mismatch: %04X and %04X", buffer.data.typ, data.typ))
}
gl.BindBuffer(buffer.bindpoint, buffer.id)
defer gl.BindBuffer(buffer.bindpoint, 0)
gl.BufferSubData(buffer.bindpoint, offset*data.siz, data.length*data.siz, data.ptr)
}
func CreateQuad(opts QuadOpts) *GameObject {
halfWidth := opts.Width / 2
halfHeight := opts.Height / 2
verts := []float32{
-halfWidth, -halfHeight,
-halfWidth, halfHeight,
halfWidth, halfHeight,
halfWidth, -halfHeight,
}
g := &GameObject{
Transform: NewTransform(nil),
VboPosition: G.Renderer.GetNewVboPosition(verts),
Vertices: verts,
}
gl.BindBuffer(gl.ARRAY_BUFFER, g.VboPosition.Vbo.Id)
gl.BufferSubData(gl.ARRAY_BUFFER, int(g.VboPosition.Index*4), len(g.Vertices)*4, gl.Ptr(g.Vertices))
G.Renderer.GameObjects = append(G.Renderer.GameObjects, g)
return g
}
// BufferSubData sets some of data in the bound buffer object.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glBufferSubData.xhtml
func BufferSubData(target Enum, offset, size int, data unsafe.Pointer) {
gl.BufferSubData(uint32(target), offset, size, data)
}
// BufferSubData sets some of data in the bound buffer object.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glBufferSubData.xhtml
func BufferSubData(target Enum, offset int, data []byte) {
gl.BufferSubData(uint32(target), offset, int(len(data)), gl.Ptr(&data[0]))
}
func (c *Context) BufferSubData(bufferType BufferType, data []int16) {
const int16Size = 2
gl.BufferSubData(uint32(bufferType), 0, int16Size*len(data), gl.Ptr(data))
}
func (c *Context) BufferSubData(target int, offset int, data interface{}) {
size := uintptr(reflect.ValueOf(data).Len()) * reflect.TypeOf(data).Elem().Size()
gl.BufferSubData(uint32(target), offset, int(size), gl.Ptr(data))
}
func (c *Context) BufferSubData(bufferType BufferType, data []float32) {
_ = c.runOnContextThread(func() error {
gl.BufferSubData(uint32(bufferType), 0, len(data)*4, gl.Ptr(data))
return nil
})
}