func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]uint8, error) {
gl.Flush()
gl.BindFramebuffer(gl.FRAMEBUFFER, uint32(f))
pixels := make([]uint8, 4*width*height)
gl.ReadPixels(0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(pixels))
if e := gl.GetError(); e != gl.NO_ERROR {
return nil, errors.New(fmt.Sprintf("glReadPixels: %d", e))
}
return pixels, nil
}
func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]uint8, error) {
var pixels []uint8
if err := c.runOnContextThread(func() error {
gl.Flush()
return nil
}); err != nil {
return nil, err
}
if err := c.bindFramebuffer(f); err != nil {
return nil, err
}
if err := c.runOnContextThread(func() error {
pixels = make([]uint8, 4*width*height)
gl.ReadPixels(0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(pixels))
if e := gl.GetError(); e != gl.NO_ERROR {
pixels = nil
return fmt.Errorf("opengl: glReadPixels: %d", e)
}
return nil
}); err != nil {
return nil, err
}
return pixels, nil
}
// ReadPixels returns pixel data from a buffer.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glReadPixels.xhtml
func ReadPixels(dst []byte, x, y, width, height int, format, ty Enum) {
gl.ReadPixels(int32(x), int32(y), int32(width), int32(height), uint32(format), uint32(ty), gl.Ptr(&dst[0]))
}