private static (ovrTextureSwapChain, Texture[]) CreateSwapchainD3D11(
ovrSession session,
GraphicsDevice gd,
ovrTextureSwapChainDesc desc)
{
ovrTextureSwapChain otsc;
Texture[] textures;
ovrResult result = ovr_CreateTextureSwapChainDX(session, gd.GetD3D11Info().Device, &desc, &otsc);
if (result != ovrResult.Success)
{
throw new VeldridException($"Failed to call ovr_CreateTextureSwapChainDX: {result}");
}
int textureCount = 0;
ovr_GetTextureSwapChainLength(session, otsc, &textureCount);
textures = new Texture[textureCount];
for (int i = 0; i < textureCount; ++i)
{
IntPtr nativeTexture;
ovr_GetTextureSwapChainBufferDX(session, otsc, i, s_d3d11Tex2DGuid, &nativeTexture);
textures[i] = gd.ResourceFactory.CreateTexture(
(ulong)nativeTexture,
OculusUtil.GetVeldridTextureDescription(desc));
}
return(otsc, textures);
}
public static TextureDescription GetVeldridTextureDescription(ovrTextureSwapChainDesc desc)
{
return(TextureDescription.Texture2D(
(uint)desc.Width, (uint)desc.Height,
(uint)desc.MipLevels,
(uint)desc.ArraySize,
GetVeldridPixelFormat(desc.Format),
GetVeldridTextureUsage(desc.BindFlags),
GetSampleCount(desc.SampleCount)));
}
public OculusSwapchain(GraphicsDevice gd, ovrSession session, int sizeW, int sizeH, int sampleCount, bool createDepth)
{
_session = session;
Texture[] colorTextures;
Texture[] depthTextures = null;
ovrTextureSwapChainDesc colorDesc = new ovrTextureSwapChainDesc();
colorDesc.Type = ovrTextureType.Texture2D;
colorDesc.ArraySize = 1;
colorDesc.Width = sizeW;
colorDesc.Height = sizeH;
colorDesc.MipLevels = 1;
colorDesc.SampleCount = sampleCount;
colorDesc.Format = ovrTextureFormat.R8G8B8A8_UNORM_SRGB;
colorDesc.MiscFlags = ovrTextureMiscFlags.DX_Typeless | ovrTextureMiscFlags.AllowGenerateMips;
colorDesc.BindFlags = ovrTextureBindFlags.DX_RenderTarget;
colorDesc.StaticImage = false;
(ColorChain, colorTextures) = CreateSwapchain(session, gd, colorDesc);
// if requested, then create depth swap chain
if (createDepth)
{
ovrTextureSwapChainDesc depthDesc = new ovrTextureSwapChainDesc();
depthDesc.Type = ovrTextureType.Texture2D;
depthDesc.ArraySize = 1;
depthDesc.Width = sizeW;
depthDesc.Height = sizeH;
depthDesc.MipLevels = 1;
depthDesc.SampleCount = sampleCount;
depthDesc.Format = ovrTextureFormat.D32_FLOAT;
depthDesc.MiscFlags = ovrTextureMiscFlags.None;
depthDesc.BindFlags = ovrTextureBindFlags.DX_DepthStencil;
depthDesc.StaticImage = false;
(DepthChain, depthTextures) = CreateSwapchain(session, gd, depthDesc);
}
Framebuffers = new Framebuffer[colorTextures.Length];
for (int i = 0; i < Framebuffers.Length; i++)
{
Framebuffers[i] = gd.ResourceFactory.CreateFramebuffer(new FramebufferDescription(
depthTextures?[i],
colorTextures[i]));
}
CommandList = gd.ResourceFactory.CreateCommandList();
}
private static (ovrTextureSwapChain, Texture[]) CreateSwapchainGL(
ovrSession session,
GraphicsDevice gd,
ovrTextureSwapChainDesc desc)
{
ovrTextureSwapChain otsc = default;
Texture[] textures = default;
ovrResult result = ovrResult.Success;
gd.GetOpenGLInfo().ExecuteOnGLThread(() =>
{
ovrTextureSwapChainDesc localDesc = desc;
localDesc.MiscFlags = localDesc.MiscFlags & ~(ovrTextureMiscFlags.DX_Typeless | ovrTextureMiscFlags.AllowGenerateMips);
localDesc.BindFlags = ovrTextureBindFlags.None;
ovrTextureSwapChain sc;
result = ovr_CreateTextureSwapChainGL(session, &localDesc, &sc);
if (result != ovrResult.Success)
{
return;
}
otsc = sc;
});
if (otsc.IsNull)
{
throw new VeldridException($"Failed to call ovr_CreateTextureSwapChainGL: {result}");
}
int textureCount = 0;
ovr_GetTextureSwapChainLength(session, otsc, &textureCount);
textures = new Texture[textureCount];
for (int i = 0; i < textureCount; ++i)
{
uint glID;
ovr_GetTextureSwapChainBufferGL(session, otsc, i, &glID);
textures[i] = gd.ResourceFactory.CreateTexture(
glID,
OculusUtil.GetVeldridTextureDescription(desc));
}
return(otsc, textures);
}
private (ovrTextureSwapChain, Texture[]) CreateSwapchain(
ovrSession session,
GraphicsDevice gd,
ovrTextureSwapChainDesc desc)
{
switch (gd.BackendType)
{
case GraphicsBackend.Direct3D11:
return(CreateSwapchainD3D11(session, gd, desc));
case GraphicsBackend.OpenGL:
case GraphicsBackend.OpenGLES:
return(CreateSwapchainGL(session, gd, desc));
case GraphicsBackend.Vulkan:
return(CreateSwapchainVk(session, gd, desc));
case GraphicsBackend.Metal:
throw new PlatformNotSupportedException("Using Oculus with the Metal backend is not supported.");
default:
throw new NotImplementedException();
}
}
