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) 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
}
func (canvas *Canvas) attacheExtra(canvases []*Canvas) {
if canvases != nil && len(canvases) > 0 {
// Attach the canvas textures to the active FBO and set up MRTs.
drawbuffers := []uint32{gl.COLOR_ATTACHMENT0}
// Attach the canvas textures to the currently bound framebuffer.
for i := 0; i < len(canvases); i++ {
buf := gl.COLOR_ATTACHMENT1 + uint32(i)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, buf, gl.TEXTURE_2D, canvases[i].getHandle().Value, 0)
drawbuffers = append(drawbuffers, buf)
}
// set up multiple render targets
gl.DrawBuffers(int32(len(drawbuffers)), &drawbuffers[0])
} else {
// Make sure the FBO is only using a single draw buffer.
gl.DrawBuffer(gl.COLOR_ATTACHMENT0)
}
}
// FramebufferTexture2D attaches the t to the current frame buffer.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glFramebufferTexture2D.xhtml
func FramebufferTexture2D(target, attachment, texTarget Enum, t Texture, level int) {
gl.FramebufferTexture2D(uint32(target), uint32(attachment), uint32(texTarget), t.Value, int32(level))
}