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using OpenTK;
using OpenTK.Graphics.OpenGL;
using System;
using System.Collections.Generic;
namespace Ryujinx.Graphics.Gal.OpenGL
{
class OGLFrameBuffer
{
private class FrameBuffer
{
public int Width { get; set; }
public int Height { get; set; }
public int Handle { get; private set; }
public int RbHandle { get; private set; }
public int TexHandle { get; private set; }
public FrameBuffer(int Width, int Height)
{
this.Width = Width;
this.Height = Height;
Handle = GL.GenFramebuffer();
RbHandle = GL.GenRenderbuffer();
TexHandle = GL.GenTexture();
}
}
private struct ShaderProgram
{
public int Handle;
public int VpHandle;
public int FpHandle;
}
private Dictionary<long, FrameBuffer> Fbs;
private ShaderProgram Shader;
private bool IsInitialized;
private int RawFbTexWidth;
private int RawFbTexHeight;
private int RawFbTexHandle;
private int CurrFbHandle;
private int CurrTexHandle;
private int VaoHandle;
private int VboHandle;
public OGLFrameBuffer()
{
Fbs = new Dictionary<long, FrameBuffer>();
Shader = new ShaderProgram();
}
public void Create(long Tag, int Width, int Height)
{
if (Fbs.TryGetValue(Tag, out FrameBuffer Fb))
{
if (Fb.Width != Width ||
Fb.Height != Height)
{
SetupTexture(Fb.TexHandle, Width, Height);
Fb.Width = Width;
Fb.Height = Height;
}
return;
}
Fb = new FrameBuffer(Width, Height);
SetupTexture(Fb.TexHandle, Width, Height);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, Fb.Handle);
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, Fb.RbHandle);
GL.RenderbufferStorage(
RenderbufferTarget.Renderbuffer,
RenderbufferStorage.Depth24Stencil8,
Width,
Height);
GL.FramebufferRenderbuffer(
FramebufferTarget.Framebuffer,
FramebufferAttachment.DepthStencilAttachment,
RenderbufferTarget.Renderbuffer,
Fb.RbHandle);
GL.FramebufferTexture(
FramebufferTarget.Framebuffer,
FramebufferAttachment.ColorAttachment0,
Fb.TexHandle,
0);
GL.DrawBuffer(DrawBufferMode.ColorAttachment0);
Fbs.Add(Tag, Fb);
}
public void Bind(long Tag)
{
if (Fbs.TryGetValue(Tag, out FrameBuffer Fb))
{
GL.BindFramebuffer(FramebufferTarget.Framebuffer, Fb.Handle);
CurrFbHandle = Fb.Handle;
}
}
public void BindTexture(long Tag, int Index)
{
if (Fbs.TryGetValue(Tag, out FrameBuffer Fb))
{
GL.ActiveTexture(TextureUnit.Texture0 + Index);
GL.BindTexture(TextureTarget.Texture2D, Fb.TexHandle);
}
}
public void Set(long Tag)
{
if (Fbs.TryGetValue(Tag, out FrameBuffer Fb))
{
CurrTexHandle = Fb.TexHandle;
}
}
public void Set(byte[] Data, int Width, int Height)
{
if (RawFbTexHandle == 0)
{
RawFbTexHandle = GL.GenTexture();
}
if (RawFbTexWidth != Width ||
RawFbTexHeight != Height)
{
SetupTexture(RawFbTexHandle, Width, Height);
RawFbTexWidth = Width;
RawFbTexHeight = Height;
}
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, RawFbTexHandle);
(PixelFormat Format, PixelType Type) = OGLEnumConverter.GetTextureFormat(GalTextureFormat.A8B8G8R8);
GL.TexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, Width, Height, Format, Type, Data);
CurrTexHandle = RawFbTexHandle;
}
public void SetTransform(Matrix2 Transform, Vector2 Offs)
{
EnsureInitialized();
int CurrentProgram = GL.GetInteger(GetPName.CurrentProgram);
GL.UseProgram(Shader.Handle);
int TransformUniformLocation = GL.GetUniformLocation(Shader.Handle, "transform");
GL.UniformMatrix2(TransformUniformLocation, false, ref Transform);
int OffsetUniformLocation = GL.GetUniformLocation(Shader.Handle, "offset");
GL.Uniform2(OffsetUniformLocation, ref Offs);
GL.UseProgram(CurrentProgram);
}
public void Render()
{
if (CurrTexHandle != 0)
{
EnsureInitialized();
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, CurrTexHandle);
int CurrentProgram = GL.GetInteger(GetPName.CurrentProgram);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
GL.BindVertexArray(VaoHandle);
GL.UseProgram(Shader.Handle);
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
//Restore the original state.
GL.BindFramebuffer(FramebufferTarget.Framebuffer, CurrFbHandle);
GL.UseProgram(CurrentProgram);
}
}
private void EnsureInitialized()
{
if (!IsInitialized)
{
IsInitialized = true;
SetupShader();
SetupVertex();
}
}
private void SetupShader()
{
Shader.VpHandle = GL.CreateShader(ShaderType.VertexShader);
Shader.FpHandle = GL.CreateShader(ShaderType.FragmentShader);
string VpSource = EmbeddedResource.GetString("GlFbVtxShader");
string FpSource = EmbeddedResource.GetString("GlFbFragShader");
GL.ShaderSource(Shader.VpHandle, VpSource);
GL.ShaderSource(Shader.FpHandle, FpSource);
GL.CompileShader(Shader.VpHandle);
GL.CompileShader(Shader.FpHandle);
Shader.Handle = GL.CreateProgram();
GL.AttachShader(Shader.Handle, Shader.VpHandle);
GL.AttachShader(Shader.Handle, Shader.FpHandle);
GL.LinkProgram(Shader.Handle);
GL.UseProgram(Shader.Handle);
Matrix2 Transform = Matrix2.Identity;
int TexUniformLocation = GL.GetUniformLocation(Shader.Handle, "tex");
GL.Uniform1(TexUniformLocation, 0);
int WindowSizeUniformLocation = GL.GetUniformLocation(Shader.Handle, "window_size");
GL.Uniform2(WindowSizeUniformLocation, new Vector2(1280.0f, 720.0f));
int TransformUniformLocation = GL.GetUniformLocation(Shader.Handle, "transform");
GL.UniformMatrix2(TransformUniformLocation, false, ref Transform);
}
private void SetupVertex()
{
VaoHandle = GL.GenVertexArray();
VboHandle = GL.GenBuffer();
float[] Buffer = new float[]
{
-1, 1, 0, 0,
1, 1, 1, 0,
-1, -1, 0, 1,
1, -1, 1, 1
};
IntPtr Length = new IntPtr(Buffer.Length * 4);
GL.BindBuffer(BufferTarget.ArrayBuffer, VboHandle);
GL.BufferData(BufferTarget.ArrayBuffer, Length, Buffer, BufferUsageHint.StreamDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindVertexArray(VaoHandle);
GL.EnableVertexAttribArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, VboHandle);
GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, 16, 0);
GL.EnableVertexAttribArray(1);
GL.BindBuffer(BufferTarget.ArrayBuffer, VboHandle);
GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, 16, 8);
}
private void SetupTexture(int Handle, int Width, int Height)
{
GL.BindTexture(TextureTarget.Texture2D, Handle);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
(PixelFormat Format, PixelType Type) = OGLEnumConverter.GetTextureFormat(GalTextureFormat.A8B8G8R8);
const PixelInternalFormat InternalFmt = PixelInternalFormat.Rgba;
const int Level = 0;
const int Border = 0;
GL.TexImage2D(
TextureTarget.Texture2D,
Level,
InternalFmt,
Width,
Height,
Border,
Format,
Type,
IntPtr.Zero);
}
}
}
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