void EnsureDepthBufferAttachment(GlInterface gl)
{
var size = GetPixelSize();
if (size == _depthBufferSize && _depthBuffer != 0)
{
return;
}
gl.GetIntegerv(GL_RENDERBUFFER_BINDING, out var oldRenderBuffer);
if (_depthBuffer != 0)
{
gl.DeleteRenderbuffers(1, new[] { _depthBuffer });
}
var oneArr = new int[1];
gl.GenRenderbuffers(1, oneArr);
_depthBuffer = oneArr[0];
gl.BindRenderbuffer(GL_RENDERBUFFER, _depthBuffer);
gl.RenderbufferStorage(GL_RENDERBUFFER,
GlVersion.Type == GlProfileType.OpenGLES ? GL_DEPTH_COMPONENT16 : GL_DEPTH_COMPONENT,
size.Width, size.Height);
gl.FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, _depthBuffer);
gl.BindRenderbuffer(GL_RENDERBUFFER, oldRenderBuffer);
}
public static LayerFbo TryCreate(EAGLContext context, GlInterface gl, CAEAGLLayer layer)
{
if (context != EAGLContext.CurrentContext)
{
return(null);
}
var fb = new int[2];
var rb = new int[2];
var db = new int[2];
gl.GenRenderbuffers(1, rb);
gl.BindRenderbuffer(GlConsts.GL_RENDERBUFFER, rb[0]);
context.RenderBufferStorage(GlConsts.GL_RENDERBUFFER, layer);
gl.GenFramebuffers(1, fb);
gl.BindFramebuffer(GlConsts.GL_FRAMEBUFFER, fb[0]);
gl.FramebufferRenderbuffer(GlConsts.GL_FRAMEBUFFER, GlConsts.GL_COLOR_ATTACHMENT0, GlConsts.GL_RENDERBUFFER, rb[0]);
int[] w = new int[1];
int[] h = new int[1];
gl.GetRenderbufferParameteriv(GlConsts.GL_RENDERBUFFER, GlConsts.GL_RENDERBUFFER_WIDTH, w);
gl.GetRenderbufferParameteriv(GlConsts.GL_RENDERBUFFER, GlConsts.GL_RENDERBUFFER_HEIGHT, h);
gl.GenRenderbuffers(1, db);
//GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, depthBuffer);
//GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferInternalFormat.DepthComponent16, w, h);
gl.FramebufferRenderbuffer(GlConsts.GL_FRAMEBUFFER, GlConsts.GL_DEPTH_ATTACHMENT, GlConsts.GL_RENDERBUFFER, db[0]);
var frameBufferError = gl.CheckFramebufferStatus(GlConsts.GL_FRAMEBUFFER);
if (frameBufferError != GlConsts.GL_FRAMEBUFFER_COMPLETE)
{
gl.DeleteFramebuffers(1, fb);
gl.DeleteRenderbuffers(1, db);
gl.DeleteRenderbuffers(1, rb);
return(null);
}
return(new LayerFbo(context, gl, layer, fb, rb, db)
{
Width = w[0],
Height = h[0]
});
}