/// <summary>
/// Convert a <see cref="SurfaceFormat"/> to an OpenTK.Graphics.ColorFormat.
/// This is used for setting up the backbuffer format of the OpenGL context.
/// </summary>
/// <returns>An OpenTK.Graphics.ColorFormat instance.</returns>
/// <param name="format">The <see cref="SurfaceFormat"/> to convert.</param>
internal static ColorFormat GetColorFormat(this RSurfaceFormat format)
{
switch (format)
{
case RSurfaceFormat.Alpha8:
return(new ColorFormat(0, 0, 0, 8));
case RSurfaceFormat.Bgr565:
return(new ColorFormat(5, 6, 5, 0));
case RSurfaceFormat.Bgra4444:
return(new ColorFormat(4, 4, 4, 4));
case RSurfaceFormat.Bgra5551:
return(new ColorFormat(5, 5, 5, 1));
case RSurfaceFormat.Bgr32:
return(new ColorFormat(8, 8, 8, 0));
case RSurfaceFormat.Bgra32:
case RSurfaceFormat.Color:
return(new ColorFormat(8, 8, 8, 8));
case RSurfaceFormat.Rgba1010102:
return(new ColorFormat(10, 10, 10, 2));
default:
// Floating point backbuffers formats could be implemented
// but they are not typically used on the backbuffer. In
// those cases it is better to create a render target instead.
throw new NotSupportedException();
}
}
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 IEnumerable <RDisplayMode> this[RSurfaceFormat format]
{
get
{
List <RDisplayMode> list = new List <RDisplayMode>();
foreach (RDisplayMode mode in this.modes)
{
//if (mode.Format == format)
//{
list.Add(mode);
//}
}
return(list);
}
}
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();
}
static RenderbufferStorage GetStorageForFormat(RSurfaceFormat surfaceFormat)
{
switch (surfaceFormat)
{
case RSurfaceFormat.Alpha8:
return(RenderbufferStorage.Alpha8);
case RSurfaceFormat.Color:
return(RenderbufferStorage.Rgba8);
case RSurfaceFormat.HalfVector4:
case RSurfaceFormat.HdrBlendable:
return(RenderbufferStorage.Rgba16f);
default:
return(RenderbufferStorage.Rgba8);
}
}
PixelType GetPixelTypeForSurface(RSurfaceFormat surface)
{
switch (surface)
{
case RSurfaceFormat.HalfVector2:
case RSurfaceFormat.HalfVector4:
case RSurfaceFormat.HalfSingle:
case RSurfaceFormat.HdrBlendable:
return(PixelType.HalfFloat);
case RSurfaceFormat.Single:
case RSurfaceFormat.Vector2:
case RSurfaceFormat.Vector4:
return(PixelType.Float);
case RSurfaceFormat.Rgba64:
return(PixelType.UnsignedInt);
default:
return(PixelType.UnsignedByte);
}
}
public void Create(int width, int height, RPixelFormat format, RSurfaceFormat surfaceFormat, bool multisample = false)
{
GL.GenTextures(1, out Id);
if (multisample)
{
textureTarget = TextureTarget.Texture2DMultisample;
GL.BindTexture(TextureTarget.Texture2DMultisample, Id);
GL.TexImage2DMultisample(TextureTargetMultisample.Texture2DMultisample, 4, PixelInternalFormat.Rgba, width, height, true);
REngine.CheckGLError();
CreateProperties(TextureTarget.Texture2DMultisample, true);
REngine.CheckGLError();
}
else
{
textureTarget = TextureTarget.Texture2D;
GL.BindTexture(TextureTarget.Texture2D, Id);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, width, height, 0, (PixelFormat)format, GetPixelTypeForSurface(surfaceFormat), IntPtr.Zero);
REngine.CheckGLError();
CreateProperties(TextureTarget.Texture2D, false);
REngine.CheckGLError();
}
}
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)
{
}