private void Build(int width, int height, bool mipMap,
RSurfaceFormat preferredFormat, RDepthFormat preferredDepthFormat, int preferredMultiSampleCount, bool shared)
{
var depth = 0;
var stencil = 0;
BackBuffer = new RTexture2D();
BackBuffer.Create(width, height, RPixelFormat.Rgba, preferredFormat);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2D, BackBuffer.Id, 0);
if (preferredDepthFormat != RDepthFormat.None)
{
DepthBuffer = new RTexture2D();
if (preferredDepthFormat == RDepthFormat.Depth24Stencil8 || preferredDepthFormat == RDepthFormat.Depth32Stencil8)
{
DepthBuffer.CreateDepth(width, height, RPixelFormat.DepthStencil, preferredDepthFormat);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthStencilAttachment, TextureTarget.Texture2D, DepthBuffer.Id, 0);
}
else
{
DepthBuffer.CreateDepth(width, height, RPixelFormat.DepthComponent, preferredDepthFormat);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, TextureTarget.Texture2D, DepthBuffer.Id, 0);
}
REngine.CheckGLError();
}
if (GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer) != FramebufferErrorCode.FramebufferComplete)
{
throw new Exception("Error creating frame buffer: framebuffer is not complete");
}
}
public void CreateDepth(int width, int height, RPixelFormat format, RDepthFormat depthFormat)
{
GL.GenTextures(1, out Id);
textureTarget = TextureTarget.Texture2D;
GL.BindTexture(textureTarget, Id);
REngine.CheckGLError();
GL.TexImage2D(textureTarget, 0, GetPixelInternalForDepth(depthFormat), width, height, 0, (PixelFormat)format, GetPixelTypeForDepth(depthFormat), IntPtr.Zero);
REngine.CheckGLError();
CreateProperties(textureTarget, false);
REngine.CheckGLError();
}
PixelType GetPixelTypeForDepth(RDepthFormat depthFormat)
{
switch (depthFormat)
{
case RDepthFormat.Depth16:
case RDepthFormat.Depth24:
return(PixelType.UnsignedInt);
case RDepthFormat.Depth24Stencil8:
case RDepthFormat.Depth32Stencil8:
return(PixelType.UnsignedInt248);
default:
return(PixelType.UnsignedInt);
}
}
public RFrameBuffer(int width, int height, bool mipMap, RSurfaceFormat preferredFormat, RDepthFormat preferredDepthFormat, int preferredMultiSampleCount, bool shared)
{
Width = width;
Height = height;
DepthStencilFormat = preferredDepthFormat;
SurfaceFormat = preferredFormat;
MultiSampleCount = preferredMultiSampleCount;
var id = 0;
GL.GenFramebuffers(1, out id);
REngine.CheckGLError();
Id = id;
Bind();
Build(width, height, mipMap, preferredFormat, preferredDepthFormat, preferredMultiSampleCount, shared);
Unbind();
}
PixelInternalFormat GetPixelInternalForDepth(RDepthFormat depthFormat)
{
switch (depthFormat)
{
case RDepthFormat.Depth16:
return(PixelInternalFormat.DepthComponent16);
case RDepthFormat.Depth24:
return(PixelInternalFormat.DepthComponent24);
case RDepthFormat.Depth24Stencil8:
return(PixelInternalFormat.Depth24Stencil8);
case RDepthFormat.Depth32Stencil8:
return(PixelInternalFormat.Depth32fStencil8);
default:
return(PixelInternalFormat.DepthStencil);
}
}
public RFrameBuffer(int width, int height, bool mipMap, RSurfaceFormat preferredFormat, RDepthFormat preferredDepthFormat)
: this(width, height, mipMap, preferredFormat, preferredDepthFormat, 0)
{
}
public RFrameBuffer(int width, int height, bool mipMap, RSurfaceFormat preferredFormat, RDepthFormat preferredDepthFormat, int preferredMultiSampleCount)
: this(width, height, mipMap, preferredFormat, preferredDepthFormat, preferredMultiSampleCount, false)
{
}
