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);
}
protected override void OnRenderFrame(FrameEventArgs e)
{
base.OnRenderFrame(e);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
Vector3 camPos = new Vector3(0, 2, 5);
Quaternion camOri = Quaternion.Identity;
#if RENDER_OCULUS
for (int i = 0; i < 2; i++)
{
//zoom field of view
var fov = new FovPort
{
DownTan = eyes[i].desc.Fov.DownTan / zoomFactor,
UpTan = eyes[i].desc.Fov.UpTan / zoomFactor,
LeftTan = eyes[i].desc.Fov.LeftTan / zoomFactor,
RightTan = eyes[i].desc.Fov.RightTan / zoomFactor
};
eyes[i].proj = OvrDLL.ovrMatrix4f_Projection(fov, 0.1f, 1000.0f, ProjectionModifier.ClipRangeOpenGL);
//bind eye fbo
bindFbo(eyes[i]);
//combine the "camera" position/rotation with the position/rotation of the eye
Vector3 finalPos = camPos + (camOri * eyes[i].pose.Position);
Matrix4 finalRot = Matrix4.CreateFromQuaternion(camOri * eyes[i].pose.Orientation);
//create the view matrix with a lookat basis vectors
Vector3 up = eyes[i].pose.Orientation * Vector3.UnitY;
Vector3 fwd = eyes[i].pose.Orientation * -Vector3.UnitZ;
Matrix4 view = Matrix4.LookAt(finalPos, finalPos + fwd, up);
//draw the scene
drawScene(view, eyes[i].proj);
//commit the swapchain
OvrDLL.ovr_CommitTextureSwapChain(session, eyes[i].swapChain);
}
//send to Oculus
LayerEyeFov eyeFov = layers[0] as LayerEyeFov;
eyeFov.Header.Flags = LayerFlags.TextureOriginAtBottomLeft;
eyeFov.ColorTexture[0] = eyes[0].swapChain;
eyeFov.ColorTexture[1] = eyes[1].swapChain;
eyeFov.Fov[0] = eyes[0].desc.Fov;
eyeFov.Fov[1] = eyes[1].desc.Fov;
eyeFov.Viewport[0] = new Recti(new Vector2i(0,0), eyes[0].renderTargetSize);
eyeFov.Viewport[1] = new Recti(new Vector2i(0, 0), eyes[1].renderTargetSize);
eyeFov.RenderPose[0] = eyes[0].pose;
eyeFov.RenderPose[1] = eyes[1].pose;
ViewScaleDesc viewScale = new ViewScaleDesc();
result = OvrDLL.ovr_SubmitFrame(session, 0, ref viewScale, layers.GetUnmanagedLayers(), 1);
if (result < 0)
{
Console.WriteLine("Error submitting frame");
OvrDLL.ovr_GetLastErrorInfo(ref error);
Console.WriteLine("Last Error Info: {0}-{1}", error.result, error.ErrorString);
}
//blit mirror to fbo
OvrDLL.ovr_GetMirrorTextureBufferGL(session, mirror, ref myMirrorTexture);
blitMirror((int)myMirrorTexture);
#else
Matrix4 view = Matrix4.CreateTranslation(-camPos);
Matrix4 proj = Matrix4.CreatePerspectiveFieldOfView(MathHelper.DegreesToRadians(60.0f), 1.0f, 0.1f, 1000.0f);
drawScene(view, proj);
#endif
SwapBuffers();
}
