func TestDrawPixels(t *testing.T) {
gl.DrawPixels(4, 4, gl.RGBA, gl.UNSIGNED_INT, slice)
if gl.GetError() != gl.NO_ERROR {
t.Error("slice failed")
}
buf := newBuffer(16 * 4)
buf.Bind(gl.PIXEL_UNPACK_BUFFER)
defer buf.Delete()
gl.DrawPixels(2, 2, gl.RGBA, gl.UNSIGNED_INT, uintptr(0))
if gl.GetError() != gl.NO_ERROR {
t.Error("buffer offset failed")
}
}
func TestReadPixels(t *testing.T) {
pixels := []byte{1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4}
gl.DrawPixels(2, 2, gl.RGB, gl.UNSIGNED_BYTE, pixels)
result := make([]byte, 4*3)
gl.ReadPixels(0, 0, 2, 2, gl.RGB, gl.UNSIGNED_BYTE, result)
if gl.GetError() != gl.NO_ERROR {
t.Error("slice failed")
}
// result is {1,1,1, 2,2,2, 0,0,3, 4,4,4}, no idea why.
if false {
t.Error("was", result)
}
}