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using OpenTK.Graphics.OpenGL;
using Ryujinx.Graphics.GAL;
using System;
using System.Collections.Generic;
namespace Ryujinx.Graphics.OpenGL
{
class Window : IWindow
{
private const int NativeWidth = 1280;
private const int NativeHeight = 720;
private int _width = 1280;
private int _height = 720;
private int _blitFramebufferHandle;
private int _copyFramebufferHandle;
private int _screenTextureHandle;
private TextureReleaseCallback _release;
private struct PresentationTexture
{
public TextureView Texture { get; }
public ImageCrop Crop { get; }
public object Context { get; }
public PresentationTexture(TextureView texture, ImageCrop crop, object context)
{
Texture = texture;
Crop = crop;
Context = context;
}
}
private Queue<PresentationTexture> _textures;
public Window()
{
_textures = new Queue<PresentationTexture>();
}
public void Present()
{
GL.Disable(EnableCap.FramebufferSrgb);
CopyTextureFromQueue();
int oldReadFramebufferHandle = GL.GetInteger(GetPName.ReadFramebufferBinding);
int oldDrawFramebufferHandle = GL.GetInteger(GetPName.DrawFramebufferBinding);
GL.BindFramebuffer(FramebufferTarget.DrawFramebuffer, 0);
GL.BindFramebuffer(FramebufferTarget.ReadFramebuffer, GetCopyFramebufferHandleLazy());
GL.ReadBuffer(ReadBufferMode.ColorAttachment0);
GL.Clear(ClearBufferMask.ColorBufferBit);
GL.BlitFramebuffer(
0,
0,
1280,
720,
0,
0,
1280,
720,
ClearBufferMask.ColorBufferBit,
BlitFramebufferFilter.Linear);
GL.BindFramebuffer(FramebufferTarget.ReadFramebuffer, oldReadFramebufferHandle);
GL.BindFramebuffer(FramebufferTarget.DrawFramebuffer, oldDrawFramebufferHandle);
GL.Enable(EnableCap.FramebufferSrgb);
}
private void CopyTextureFromQueue()
{
if (!_textures.TryDequeue(out PresentationTexture presentationTexture))
{
return;
}
TextureView texture = presentationTexture.Texture;
ImageCrop crop = presentationTexture.Crop;
object context = presentationTexture.Context;
int oldReadFramebufferHandle = GL.GetInteger(GetPName.ReadFramebufferBinding);
int oldDrawFramebufferHandle = GL.GetInteger(GetPName.DrawFramebufferBinding);
GL.BindFramebuffer(FramebufferTarget.DrawFramebuffer, GetCopyFramebufferHandleLazy());
GL.BindFramebuffer(FramebufferTarget.ReadFramebuffer, GetBlitFramebufferHandleLazy());
GL.FramebufferTexture(
FramebufferTarget.ReadFramebuffer,
FramebufferAttachment.ColorAttachment0,
texture.Handle,
0);
GL.ReadBuffer(ReadBufferMode.ColorAttachment0);
GL.Clear(ClearBufferMask.ColorBufferBit);
int srcX0, srcX1, srcY0, srcY1;
if (crop.Left == 0 && crop.Right == 0)
{
srcX0 = 0;
srcX1 = texture.Width;
}
else
{
srcX0 = crop.Left;
srcX1 = crop.Right;
}
if (crop.Top == 0 && crop.Bottom == 0)
{
srcY0 = 0;
srcY1 = texture.Height;
}
else
{
srcY0 = crop.Top;
srcY1 = crop.Bottom;
}
float ratioX = MathF.Min(1f, (_height * (float)NativeWidth) / ((float)NativeHeight * _width));
float ratioY = MathF.Min(1f, (_width * (float)NativeHeight) / ((float)NativeWidth * _height));
int dstWidth = (int)(_width * ratioX);
int dstHeight = (int)(_height * ratioY);
int dstPaddingX = (_width - dstWidth) / 2;
int dstPaddingY = (_height - dstHeight) / 2;
int dstX0 = crop.FlipX ? _width - dstPaddingX : dstPaddingX;
int dstX1 = crop.FlipX ? dstPaddingX : _width - dstPaddingX;
int dstY0 = crop.FlipY ? dstPaddingY : _height - dstPaddingY;
int dstY1 = crop.FlipY ? _height - dstPaddingY : dstPaddingY;
GL.BlitFramebuffer(
srcX0,
srcY0,
srcX1,
srcY1,
dstX0,
dstY0,
dstX1,
dstY1,
ClearBufferMask.ColorBufferBit,
BlitFramebufferFilter.Linear);
GL.BindFramebuffer(FramebufferTarget.ReadFramebuffer, oldReadFramebufferHandle);
GL.BindFramebuffer(FramebufferTarget.DrawFramebuffer, oldDrawFramebufferHandle);
texture.Release();
Release(context);
}
public void QueueTexture(ITexture texture, ImageCrop crop, object context)
{
if (texture == null)
{
Release(context);
return;
}
TextureView textureView = (TextureView)texture;
textureView.Acquire();
_textures.Enqueue(new PresentationTexture(textureView, crop, context));
}
public void RegisterTextureReleaseCallback(TextureReleaseCallback callback)
{
_release = callback;
}
private void Release(object context)
{
if (_release != null)
{
_release(context);
}
}
private int GetBlitFramebufferHandleLazy()
{
int handle = _blitFramebufferHandle;
if (handle == 0)
{
handle = GL.GenFramebuffer();
_blitFramebufferHandle = handle;
}
return handle;
}
private int GetCopyFramebufferHandleLazy()
{
int handle = _copyFramebufferHandle;
if (handle == 0)
{
int textureHandle = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, textureHandle);
GL.TexImage2D(
TextureTarget.Texture2D,
0,
PixelInternalFormat.Rgba8,
1280,
720,
0,
PixelFormat.Rgba,
PixelType.UnsignedByte,
IntPtr.Zero);
handle = GL.GenFramebuffer();
GL.BindFramebuffer(FramebufferTarget.Framebuffer, handle);
GL.FramebufferTexture(
FramebufferTarget.Framebuffer,
FramebufferAttachment.ColorAttachment0,
textureHandle,
0);
_screenTextureHandle = textureHandle;
_copyFramebufferHandle = handle;
}
return handle;
}
}
}
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