func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
var framebuffer Framebuffer
var f uint32
if err := c.runOnContextThread(func() error {
gl.GenFramebuffers(1, &f)
// TODO: Use gl.IsFramebuffer
if f <= 0 {
return errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false")
}
return nil
}); err != nil {
return 0, err
}
if err := c.bindFramebuffer(Framebuffer(f)); err != nil {
return 0, err
}
if err := c.runOnContextThread(func() error {
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0)
s := gl.CheckFramebufferStatus(gl.FRAMEBUFFER)
if s != gl.FRAMEBUFFER_COMPLETE {
if s != 0 {
return fmt.Errorf("opengl: creating framebuffer failed: %v", s)
}
if e := gl.GetError(); e != gl.NO_ERROR {
return fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
}
return fmt.Errorf("opengl: creating framebuffer failed: unknown error")
}
framebuffer = Framebuffer(f)
return nil
}); err != nil {
return 0, err
}
return framebuffer, nil
}
func (c *Context) SetViewport(f Framebuffer, width, height int) error {
gl.Flush()
gl.BindFramebuffer(gl.FRAMEBUFFER, uint32(f))
if err := gl.CheckFramebufferStatus(gl.FRAMEBUFFER); err != gl.FRAMEBUFFER_COMPLETE {
if e := gl.GetError(); e != 0 {
return errors.New(fmt.Sprintf("glBindFramebuffer failed: %d", e))
}
return errors.New("glBindFramebuffer failed: the context is different?")
}
gl.Viewport(0, 0, int32(width), int32(height))
return nil
}
func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
var f uint32
gl.GenFramebuffers(1, &f)
gl.BindFramebuffer(gl.FRAMEBUFFER, f)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0)
if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
return 0, errors.New("creating framebuffer failed")
}
return Framebuffer(f), nil
}
// CheckFramebufferStatus reports the completeness status of the
// active framebuffer.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glCheckFramebufferStatus.xhtml
func CheckFramebufferStatus(target Enum) Enum {
return Enum(gl.CheckFramebufferStatus(uint32(target)))
}