/// <summary>
/// Initializes a new instance of the OpenGLRenderBuffer2D class.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <param name="format">The render buffer's format.</param>
/// <param name="width">The render buffer's width in pixels.</param>
/// <param name="height">The render buffer's height in pixels.</param>
/// <param name="options">The render buffer's configuration options.</param>
public OpenGLRenderBuffer2D(UltravioletContext uv, RenderBufferFormat format, Int32 width, Int32 height, RenderBufferOptions options)
: base(uv)
{
Contract.EnsureRange(width > 0, nameof(width));
Contract.EnsureRange(height > 0, nameof(height));
var isSrgb = (options & RenderBufferOptions.SrgbColor) == RenderBufferOptions.SrgbColor;
var isLinear = (options & RenderBufferOptions.LinearColor) == RenderBufferOptions.LinearColor;
if (isSrgb && isLinear)
{
throw new ArgumentException(UltravioletStrings.BuffersCannotHaveMultipleEncodings);
}
if ((isSrgb || isLinear) && format != RenderBufferFormat.Color)
{
throw new ArgumentException(UltravioletStrings.EncodingSpecifiedForNonColorBuffer);
}
var caps = uv.GetGraphics().Capabilities;
var srgbEncoded = (isLinear ? false : (isSrgb ? true : uv.Properties.SrgbDefaultForRenderBuffer2D)) && caps.SrgbEncodingEnabled;
this.format = format;
this.width = width;
this.height = height;
this.immutable = (options & RenderBufferOptions.ImmutableStorage) == RenderBufferOptions.ImmutableStorage;
this.willNotBeSampled = (options & RenderBufferOptions.WillNotBeSampled) == RenderBufferOptions.WillNotBeSampled;
if (willNotBeSampled)
{
using (var state = OpenGLState.ScopedCreateRenderbuffer(out renderbuffer))
{
AllocateRenderbufferStorage(width, height);
}
}
else
{
switch (format)
{
case RenderBufferFormat.Color:
{
var texformat = OpenGLTextureUtil.GetFormatFromBytesPerPixel(4);
var texinternalformat = OpenGLTextureUtil.GetInternalFormatFromBytesPerPixel(4, srgbEncoded);
this.texture = new OpenGLTexture2D(uv, texinternalformat, width, height, texformat, gl.GL_UNSIGNED_BYTE, IntPtr.Zero, immutable, true);
this.SrgbEncoded = this.texture.SrgbEncoded;
}
break;
case RenderBufferFormat.Depth24Stencil8:
this.texture = new OpenGLTexture2D(uv, gl.GL_DEPTH24_STENCIL8, width, height, gl.GL_DEPTH_STENCIL, gl.GL_UNSIGNED_INT_24_8, IntPtr.Zero, immutable, true);
break;
case RenderBufferFormat.Depth32:
this.texture = new OpenGLTexture2D(uv, gl.GL_DEPTH_COMPONENT32, width, height, gl.GL_DEPTH_COMPONENT, gl.GL_UNSIGNED_INT, IntPtr.Zero, immutable, true);
break;
case RenderBufferFormat.Depth16:
this.texture = new OpenGLTexture2D(uv, gl.GL_DEPTH_COMPONENT16, width, height, gl.GL_DEPTH_COMPONENT, gl.GL_UNSIGNED_SHORT, IntPtr.Zero, immutable, true);
break;
case RenderBufferFormat.Stencil8:
this.texture = new OpenGLTexture2D(uv, gl.GL_STENCIL_INDEX8, width, height, gl.GL_STENCIL, gl.GL_UNSIGNED_INT, IntPtr.Zero, immutable, true);
break;
default:
throw new NotSupportedException(nameof(format));
}
}
}