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using OpenTK;
using OpenTK.Graphics.OpenGL;
using System;
namespace Ryujinx.Graphics.Gal.OpenGL
{
unsafe class FrameBuffer
{
public int WindowWidth { get; set; }
public int WindowHeight { get; set; }
private int VtxShaderHandle;
private int FragShaderHandle;
private int PrgShaderHandle;
private int TexHandle;
private int TexWidth;
private int TexHeight;
private int VaoHandle;
private int VboHandle;
private int[] Pixels;
private byte* FbPtr;
public FrameBuffer(int Width, int Height)
{
if (Width < 0)
{
throw new ArgumentOutOfRangeException(nameof(Width));
}
if (Height < 0)
{
throw new ArgumentOutOfRangeException(nameof(Height));
}
TexWidth = Width;
TexHeight = Height;
WindowWidth = Width;
WindowHeight = Height;
SetupShaders();
SetupTexture();
SetupVertex();
}
private void SetupShaders()
{
VtxShaderHandle = GL.CreateShader(ShaderType.VertexShader);
FragShaderHandle = GL.CreateShader(ShaderType.FragmentShader);
string VtxShaderSource = EmbeddedResource.GetString("GlFbVtxShader");
string FragShaderSource = EmbeddedResource.GetString("GlFbFragShader");
GL.ShaderSource(VtxShaderHandle, VtxShaderSource);
GL.ShaderSource(FragShaderHandle, FragShaderSource);
GL.CompileShader(VtxShaderHandle);
GL.CompileShader(FragShaderHandle);
PrgShaderHandle = GL.CreateProgram();
GL.AttachShader(PrgShaderHandle, VtxShaderHandle);
GL.AttachShader(PrgShaderHandle, FragShaderHandle);
GL.LinkProgram(PrgShaderHandle);
GL.UseProgram(PrgShaderHandle);
int TexUniformLocation = GL.GetUniformLocation(PrgShaderHandle, "tex");
GL.Uniform1(TexUniformLocation, 0);
int WindowSizeUniformLocation = GL.GetUniformLocation(PrgShaderHandle, "window_size");
GL.Uniform2(WindowSizeUniformLocation, new Vector2(1280.0f, 720.0f));
}
private void SetupTexture()
{
Pixels = new int[TexWidth * TexHeight];
if (TexHandle == 0)
{
TexHandle = GL.GenTexture();
}
GL.BindTexture(TextureTarget.Texture2D, TexHandle);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexImage2D(TextureTarget.Texture2D,
0,
PixelInternalFormat.Rgba,
TexWidth,
TexHeight,
0,
PixelFormat.Rgba,
PixelType.UnsignedByte,
IntPtr.Zero);
}
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);
GL.BindVertexArray(0);
}
public unsafe void Set(byte* Fb, int Width, int Height, Matrix2 Transform, Vector2 Offs)
{
if (Fb == null)
{
throw new ArgumentNullException(nameof(Fb));
}
if (Width < 0)
{
throw new ArgumentOutOfRangeException(nameof(Width));
}
if (Height < 0)
{
throw new ArgumentOutOfRangeException(nameof(Height));
}
FbPtr = Fb;
if (Width != TexWidth ||
Height != TexHeight)
{
TexWidth = Width;
TexHeight = Height;
SetupTexture();
}
GL.UseProgram(PrgShaderHandle);
int TransformUniformLocation = GL.GetUniformLocation(PrgShaderHandle, "transform");
GL.UniformMatrix2(TransformUniformLocation, false, ref Transform);
int WindowSizeUniformLocation = GL.GetUniformLocation(PrgShaderHandle, "window_size");
GL.Uniform2(WindowSizeUniformLocation, new Vector2(WindowWidth, WindowHeight));
int OffsetUniformLocation = GL.GetUniformLocation(PrgShaderHandle, "offset");
GL.Uniform2(OffsetUniformLocation, Offs);
}
public void Render()
{
if (FbPtr == null)
{
return;
}
for (int Y = 0; Y < TexHeight; Y++)
for (int X = 0; X < TexWidth; X++)
{
Pixels[X + Y * TexWidth] = *((int*)(FbPtr + GetSwizzleOffset(X, Y)));
}
GL.BindTexture(TextureTarget.Texture2D, TexHandle);
GL.TexSubImage2D(TextureTarget.Texture2D,
0,
0,
0,
TexWidth,
TexHeight,
PixelFormat.Rgba,
PixelType.UnsignedByte,
Pixels);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindVertexArray(VaoHandle);
GL.UseProgram(PrgShaderHandle);
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
}
private int GetSwizzleOffset(int X, int Y)
{
int Pos;
Pos = (Y & 0x7f) >> 4;
Pos += (X >> 4) << 3;
Pos += (Y >> 7) * ((TexWidth >> 4) << 3);
Pos *= 1024;
Pos += ((Y & 0xf) >> 3) << 9;
Pos += ((X & 0xf) >> 3) << 8;
Pos += ((Y & 0x7) >> 1) << 6;
Pos += ((X & 0x7) >> 2) << 5;
Pos += ((Y & 0x1) >> 0) << 4;
Pos += ((X & 0x3) >> 0) << 2;
return Pos;
}
}
}
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