// Creates a new Framebuffer.
func NewFramebuffer(w int, h int) (fb *Framebuffer, err error) {
var (
buffer gl.Framebuffer
texture gl.Texture
)
buffer = gl.GenFramebuffer()
buffer.Bind()
texture = gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, w, h, 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0)
gl.DrawBuffer(gl.COLOR_ATTACHMENT0)
if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
err = fmt.Errorf("Framebuffer could not be set up")
return
}
fb = &Framebuffer{
Buffer: buffer,
Texture: texture,
Width: w,
Height: h,
}
return
}
func (b *Framebuffer) Enter() {
if b.fborbo == nil {
b.fborbo = getFBORBO(b.Texture)
}
b.fbo.Bind()
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D,
b.Texture.Texture, b.Level)
s := gl.CheckFramebufferStatus(gl.FRAMEBUFFER)
if s != gl.FRAMEBUFFER_COMPLETE {
log.Panicf("Incomplete framebuffer, reason: %x", s)
}
}
func (b *Framebuffer) Enter() {
if b.fborbo == nil {
maxW := 0
maxH := 0
for _, value := range b.Sizes {
maxW = max(maxW, value.Width)
maxH = max(maxH, value.Height)
}
b.fborbo = getFBORBO(maxW, maxH)
}
b.fbo.Bind()
s := gl.CheckFramebufferStatus(gl.FRAMEBUFFER)
if s != gl.FRAMEBUFFER_COMPLETE {
log.Panicf("Incomplete framebuffer, reason: %x (level %d)", s, 0)
}
}