128 lines
5.4 KiB
C#
128 lines
5.4 KiB
C#
using System;
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using System.Numerics;
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using System.Text;
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using System.Linq;
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using ImGuiNET;
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using OpenTK.Graphics.OpenGL;
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using OpenTK.Windowing.GraphicsLibraryFramework;
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namespace Pow3r
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{
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internal sealed unsafe partial class Program
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{
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private int _glFontTexture;
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private void InitOpenGL()
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{
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if (GL.GetString(StringName.Extensions).Split(' ').Contains("GL_ARB_debug_output"))
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GL.Arb.DebugMessageCallback(GLDebugCallbackDelegate, (nint) 0x0105);
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GL.Enable(EnableCap.ScissorTest);
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GL.Enable(EnableCap.Blend);
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GL.BlendEquation(BlendEquationMode.FuncAdd);
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GL.BlendFuncSeparate(
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BlendingFactorSrc.SrcAlpha,
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BlendingFactorDest.OneMinusSrcAlpha,
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BlendingFactorSrc.One,
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BlendingFactorDest.OneMinusSrcAlpha);
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var io = ImGui.GetIO();
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io.Fonts.GetTexDataAsRGBA32(out byte* pixels, out var width, out var height, out _);
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_glFontTexture = GL.GenTexture();
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GL.BindTexture(TextureTarget.Texture2D, _glFontTexture);
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GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, width, height, 0, PixelFormat.Bgra, PixelType.UnsignedByte, (nint) pixels);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int) TextureMagFilter.Nearest);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int) TextureMinFilter.Nearest);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int) TextureWrapMode.ClampToEdge);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int) TextureWrapMode.ClampToEdge);
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/*
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GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleR, 1);
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GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleG, 1);
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GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleB, 1);
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GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleA, (int) All.Red);*/
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io.Fonts.SetTexID((nint) _glFontTexture);
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io.Fonts.ClearTexData();
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}
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private void RenderOpenGL()
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{
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GLFW.GetFramebufferSize(_window.WindowPtr, out var fbW, out var fbH);
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GL.Viewport(0, 0, fbW, fbH);
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GL.Disable(EnableCap.ScissorTest);
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GL.ClearColor(0, 0, 0, 1);
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GL.Clear(ClearBufferMask.ColorBufferBit);
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GL.Enable(EnableCap.ScissorTest);
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GL.Enable(EnableCap.Texture2D);
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var drawData = ImGui.GetDrawData();
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var l = drawData.DisplayPos.X;
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var r = drawData.DisplayPos.X + drawData.DisplaySize.X;
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var t = drawData.DisplayPos.Y;
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var b = drawData.DisplayPos.Y + drawData.DisplaySize.Y;
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var matrix = Matrix4x4.CreateOrthographicOffCenter(l, r, b, t, -1, 1);
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GL.MatrixMode(MatrixMode.Projection);
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GL.LoadMatrix((float*) &matrix);
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var clipOff = drawData.DisplayPos;
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var clipScale = drawData.FramebufferScale;
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GL.EnableClientState(ArrayCap.VertexArray);
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GL.EnableClientState(ArrayCap.TextureCoordArray);
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GL.EnableClientState(ArrayCap.ColorArray);
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for (var n = 0; n < drawData.CmdListsCount; n++)
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{
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var drawList = drawData.CmdListsRange[n];
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for (var cmdI = 0; cmdI < drawList.CmdBuffer.Size; cmdI++)
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{
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var cmd = drawList.CmdBuffer[cmdI];
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GL.BindTexture(TextureTarget.Texture2D, (uint) cmd.TextureId);
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Vector4 clipRect = default;
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clipRect.X = (cmd.ClipRect.X - clipOff.X) * clipScale.X;
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clipRect.Y = (cmd.ClipRect.Y - clipOff.Y) * clipScale.Y;
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clipRect.Z = (cmd.ClipRect.Z - clipOff.X) * clipScale.X;
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clipRect.W = (cmd.ClipRect.W - clipOff.Y) * clipScale.Y;
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GL.Scissor((int) clipRect.X, (int) (fbH - clipRect.W), (int) (clipRect.Z - clipRect.X),
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(int) (clipRect.W - clipRect.Y));
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IntPtr adjustedVB = drawList.VtxBuffer.Data + (nint) (sizeof(ImDrawVert) * cmd.VtxOffset);
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GL.VertexPointer(2, VertexPointerType.Float, sizeof(ImDrawVert), adjustedVB);
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GL.TexCoordPointer(2, TexCoordPointerType.Float, sizeof(ImDrawVert), adjustedVB + 8);
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GL.ColorPointer(4, ColorPointerType.UnsignedByte, sizeof(ImDrawVert), adjustedVB + 16);
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GL.DrawElements(PrimitiveType.Triangles, (int) cmd.ElemCount,
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DrawElementsType.UnsignedShort,
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drawList.IdxBuffer.Data + (nint) (cmd.IdxOffset * 2));
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}
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}
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_window.SwapBuffers();
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}
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private static readonly DebugProcArb GLDebugCallbackDelegate = GLDebugCallback;
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private static void GLDebugCallback(DebugSource source, DebugType type, int id, DebugSeverity severity,
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int length, IntPtr message, IntPtr userParam)
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{
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var msg = Encoding.UTF8.GetString((byte*) message, length);
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if (severity == DebugSeverity.DebugSeverityNotification)
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return;
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Console.WriteLine($"[{type}][{severity}] {source}: {msg}");
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}
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}
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}
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