/// <summary>
/// Attaches a color buffer to the render target.
/// </summary>
/// <param name="buffer">The color buffer to attach to the render target.</param>
private void AttachColorBuffer(OpenGLRenderBuffer2D buffer)
{
Contract.Ensure(colorAttachments < 16, OpenGLStrings.RenderBufferExceedsTargetCapacity);
if (colorAttachments > 0 && buffer.SrgbEncoded != hasSrgbEncodedColorBuffer)
{
throw new InvalidOperationException(UltravioletStrings.TargetsCannotHaveMultipleEncodings);
}
hasSrgbEncodedColorBuffer = buffer.SrgbEncoded;
if (buffer.WillNotBeSampled)
{
gl.NamedFramebufferRenderbuffer(framebuffer, gl.GL_FRAMEBUFFER,
(uint)(gl.GL_COLOR_ATTACHMENT0 + colorAttachments), gl.GL_RENDERBUFFER, buffer.OpenGLName);
gl.ThrowIfError();
}
else
{
if (!gl.IsFramebufferTextureAvailable)
{
gl.FramebufferTexture2D(gl.GL_FRAMEBUFFER,
(uint)(gl.GL_COLOR_ATTACHMENT0 + colorAttachments), gl.GL_TEXTURE_2D, buffer.OpenGLName, 0);
gl.ThrowIfError();
}
else
{
gl.NamedFramebufferTexture(framebuffer, gl.GL_FRAMEBUFFER,
(uint)(gl.GL_COLOR_ATTACHMENT0 + colorAttachments), buffer.OpenGLName, 0);
gl.ThrowIfError();
}
}
colorAttachments++;
}
/// <summary>
/// Attaches a stencil buffer to the render target.
/// </summary>
/// <param name="buffer">The stencil buffer to attach to the render target.</param>
private void AttachStencilBuffer(OpenGLRenderBuffer2D buffer)
{
Contract.Ensure(stencilAttachments == 0 && depthStencilAttachments == 0, OpenGLStrings.RenderBufferExceedsTargetCapacity);
if (buffer.WillNotBeSampled)
{
gl.NamedFramebufferRenderbuffer(framebuffer, gl.GL_FRAMEBUFFER, gl.GL_STENCIL_ATTACHMENT, gl.GL_RENDERBUFFER, buffer.OpenGLName);
gl.ThrowIfError();
}
else
{
if (!gl.IsFramebufferTextureAvailable)
{
gl.FramebufferTexture2D(gl.GL_FRAMEBUFFER, gl.GL_STENCIL_ATTACHMENT, gl.GL_TEXTURE_2D, buffer.OpenGLName, 0);
gl.ThrowIfError();
}
else
{
gl.NamedFramebufferTexture(framebuffer, gl.GL_FRAMEBUFFER, gl.GL_STENCIL_ATTACHMENT, buffer.OpenGLName, 0);
gl.ThrowIfError();
}
}
stencilAttachments++;
}
/// <summary>
/// Attaches a render buffer to the render target.
/// </summary>
/// <param name="buffer">The render buffer to attach to the render target.</param>
private void AttachRenderBuffer(OpenGLRenderBuffer2D buffer)
{
switch (buffer.Format)
{
case RenderBufferFormat.Color:
AttachColorBuffer(buffer);
break;
case RenderBufferFormat.Depth32:
case RenderBufferFormat.Depth16:
AttachDepthBuffer(buffer);
break;
case RenderBufferFormat.Stencil8:
AttachStencilBuffer(buffer);
break;
case RenderBufferFormat.Depth24Stencil8:
AttachDepthStencilBuffer(buffer);
break;
default:
throw new NotSupportedException();
}
UpdateDrawBuffers();
}