public TextureBuffer(Wrap oculus, Hmd hmd, bool rendertarget, bool displayableOnHmd, OVRTypes.Sizei size, int mipLevels, IntPtr data, int sampleCount)
{
wrap = oculus;
texSize = size;
OVRTypes.Result result;
Debug.Assert(sampleCount <= 1); // The code doesn't currently handle MSAA textures.
if (displayableOnHmd)
{
// This texture isn't necessarily going to be a rendertarget, but it usually is.
Debug.Assert(hmd != null); // No HMD? A little odd.
// It looks like that in order to disable sRGB we have to
// set the texture format to sRGB but omit the call the
// enabling sRGB in the framebuffer. Info here:
// https://forums.oculus.com/community/discussion/24347/srgb-and-sdk-0-6-0-0
OVRTypes.TextureSwapChainDesc desc = new OVRTypes.TextureSwapChainDesc();
desc.Type = OVRTypes.TextureType.Texture2D;
desc.ArraySize = 1;
desc.Width = size.Width;
desc.Height = size.Height;
desc.MipLevels = mipLevels;
desc.Format = OVRTypes.TextureFormat.R8G8B8A8_UNORM_SRGB; //Remember to call GL.Disable(EnableCap.FramebufferSrgb) later
desc.SampleCount = sampleCount;
desc.StaticImage = 0;
if (mipLevels > 1)
desc.MiscFlags = OVRTypes.TextureMiscFlags.AllowGenerateMips;
result = hmd.CreateTextureSwapChainGL(desc, out textureChain);
WriteErrorDetails(wrap, result, "Failed to create swap chain.");
int length = 0;
result = TextureChain.GetLength(out length);
WriteErrorDetails(wrap, result, "Failed to retrieve the number of buffers of the created swap chain.");
if (result >= OVRTypes.Result.Success)
{
for (int i = 0; i < length; ++i)
{
uint chainTexId;
// Retrieve the OpenGL texture contained in the Oculus TextureSwapChainBuffer.
result = TextureChain.GetBufferGL(i, out chainTexId);
WriteErrorDetails(wrap, result, "Failed to retrieve a texture from the created swap chain.");
GL.BindTexture(TextureTarget.Texture2D, chainTexId);
if (rendertarget)
{
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
}
else
{
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.LinearMipmapLinear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Repeat);
}
}
}
}
else
{
GL.GenTextures(1, out texId);
GL.BindTexture(TextureTarget.Texture2D, texId);
if (rendertarget)
{
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
}
else
{
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.LinearMipmapLinear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Repeat);
}
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Srgb8Alpha8, texSize.Width, texSize.Height, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
}
if (mipLevels > 1)
{
GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);
}
GL.GenFramebuffers(1, out fboId);
}