void bindFbo(EyeTarget eye)
{
UInt32 chainTexId = 0;
OvrDLL.ovr_GetTextureSwapChainBufferGL(session, eye.swapChain, -1, ref chainTexId); //-1 for the chain index is the next buffer
GL.BindFramebuffer(FramebufferTarget.Framebuffer, eye.fbo);
GL.FramebufferTexture(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, chainTexId, 0);
GL.Enable(EnableCap.FramebufferSrgb);
GL.Viewport(0, 0, eye.renderTargetSize.Width, eye.renderTargetSize.Height);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
}
void initEyeTarget(EyeType eye)
{
EyeTarget e = new EyeTarget();
e.eye = eye;
e.fbo = GL.GenFramebuffer();
e.depthTexture = GL.GenRenderbuffer();
e.desc = OvrDLL.ovr_GetRenderDesc(session, eye, eye == EyeType.Left ? hmdDesc.LeftDefaultEyeFov : hmdDesc.RightDefaultEyeFov);
e.renderTargetSize = OvrDLL.ovr_GetFovTextureSize(session, EyeType.Left, hmdDesc.LeftDefaultEyeFov, 1.0f);
e.proj = OvrDLL.ovrMatrix4f_Projection(e.desc.Fov, 0.1f, 1000.0f, ProjectionModifier.ClipRangeOpenGL);
//create the texture swap chain
TextureSwapChainDesc swapDesc = new TextureSwapChainDesc()
{
Type = TextureType.Texture2D,
ArraySize = 1,
Format = TextureFormat.R8G8B8A8_UNORM_SRGB,
Width = e.renderTargetSize.Width,
Height = e.renderTargetSize.Height,
MipLevels = 1,
SampleCount = 1,
StaticImage = 0
};
result = OvrDLL.ovr_CreateTextureSwapChainGL(session, ref swapDesc, ref e.swapChain);
if (result < 0)
{
Console.WriteLine("Error creating swap chain");
OvrDLL.ovr_GetLastErrorInfo(ref error);
Console.WriteLine("Last Error Info: {0}-{1}", error.result, error.ErrorString);
}
int swapChainLength = 0;
OvrDLL.ovr_GetTextureSwapChainLength(session, e.swapChain, ref swapChainLength);
Console.WriteLine("Swapchain length: {0}", swapChainLength);
for(int i = 0; i< swapChainLength; i++)
{
UInt32 texId = 0;
OvrDLL.ovr_GetTextureSwapChainBufferGL(session, e.swapChain, i, ref texId);
GL.BindTexture(TextureTarget.Texture2D, texId);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
}
int currentIndex = 0;
OvrDLL.ovr_GetTextureSwapChainCurrentIndex(session, e.swapChain, ref currentIndex);
Console.WriteLine("Swapchain current index: {0}", currentIndex);
UInt32 chainTexId = 0;
OvrDLL.ovr_GetTextureSwapChainBufferGL(session, e.swapChain, currentIndex, ref chainTexId);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, e.fbo);
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, e.depthTexture);
GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferStorage.DepthComponent32f, e.renderTargetSize.Width, e.renderTargetSize.Height);
GL.FramebufferRenderbuffer(FramebufferTarget.DrawFramebuffer, FramebufferAttachment.Depth, RenderbufferTarget.Renderbuffer, e.depthTexture);
GL.FramebufferTexture(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, chainTexId, 0);
DrawBuffersEnum[] drawBuffers = new DrawBuffersEnum[1] { DrawBuffersEnum.ColorAttachment0 };
GL.DrawBuffers(1, drawBuffers);
//check frame buffer completeness
FramebufferErrorCode err = GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if(err != FramebufferErrorCode.FramebufferComplete)
{
Console.WriteLine("Error in frame buffer: {0}", err);
}
eyes[(int)eye] = e;
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
}
