Pow3r: stage 1 (#4208)

Co-authored-by: 20kdc <asdd2808@gmail.com>
2021-07-04 18:11:52 +02:00
parent ea60a81fdf
commit 103bc19508
212 changed files with 8584 additions and 4426 deletions
--- a/Pow3r/Program.OpenGL.cs
+++ b/Pow3r/Program.OpenGL.cs
@@ -0,0 +1,127 @@
+using System;
+using System.Numerics;
+using System.Text;
+using System.Linq;
+using ImGuiNET;
+using OpenTK.Graphics.OpenGL;
+using OpenTK.Windowing.GraphicsLibraryFramework;
+
+namespace Pow3r
+{
+    internal sealed unsafe partial class Program
+    {
+        private int _glFontTexture;
+
+        private void InitOpenGL()
+        {
+            if (GL.GetString(StringName.Extensions).Split(' ').Contains("GL_ARB_debug_output"))
+                GL.Arb.DebugMessageCallback(GLDebugCallbackDelegate, (nint) 0x0105);
+
+            GL.Enable(EnableCap.ScissorTest);
+            GL.Enable(EnableCap.Blend);
+            GL.BlendEquation(BlendEquationMode.FuncAdd);
+            GL.BlendFuncSeparate(
+                BlendingFactorSrc.SrcAlpha,
+                BlendingFactorDest.OneMinusSrcAlpha,
+                BlendingFactorSrc.One,
+                BlendingFactorDest.OneMinusSrcAlpha);
+
+            var io = ImGui.GetIO();
+
+            io.Fonts.GetTexDataAsRGBA32(out byte* pixels, out var width, out var height, out _);
+
+            _glFontTexture = GL.GenTexture();
+            GL.BindTexture(TextureTarget.Texture2D, _glFontTexture);
+            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, width, height, 0, PixelFormat.Bgra, PixelType.UnsignedByte, (nint) pixels);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int) TextureMagFilter.Nearest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int) TextureMinFilter.Nearest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int) TextureWrapMode.ClampToEdge);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int) TextureWrapMode.ClampToEdge);
+
+            /*
+            GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleR, 1);
+            GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleG, 1);
+            GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleB, 1);
+            GL.TextureParameter(_fontTexture, TextureParameterName.TextureSwizzleA, (int) All.Red);*/
+
+            io.Fonts.SetTexID((nint) _glFontTexture);
+            io.Fonts.ClearTexData();
+        }
+
+        private void RenderOpenGL()
+        {
+            GLFW.GetFramebufferSize(_window.WindowPtr, out var fbW, out var fbH);
+            GL.Viewport(0, 0, fbW, fbH);
+            GL.Disable(EnableCap.ScissorTest);
+            GL.ClearColor(0, 0, 0, 1);
+            GL.Clear(ClearBufferMask.ColorBufferBit);
+            GL.Enable(EnableCap.ScissorTest);
+            GL.Enable(EnableCap.Texture2D);
+
+            var drawData = ImGui.GetDrawData();
+
+            var l = drawData.DisplayPos.X;
+            var r = drawData.DisplayPos.X + drawData.DisplaySize.X;
+            var t = drawData.DisplayPos.Y;
+            var b = drawData.DisplayPos.Y + drawData.DisplaySize.Y;
+
+            var matrix = Matrix4x4.CreateOrthographicOffCenter(l, r, b, t, -1, 1);
+
+            GL.MatrixMode(MatrixMode.Projection);
+            GL.LoadMatrix((float*) &matrix);
+
+            var clipOff = drawData.DisplayPos;
+            var clipScale = drawData.FramebufferScale;
+
+            GL.EnableClientState(ArrayCap.VertexArray);
+            GL.EnableClientState(ArrayCap.TextureCoordArray);
+            GL.EnableClientState(ArrayCap.ColorArray);
+
+            for (var n = 0; n < drawData.CmdListsCount; n++)
+            {
+                var drawList = drawData.CmdListsRange[n];
+
+                for (var cmdI = 0; cmdI < drawList.CmdBuffer.Size; cmdI++)
+                {
+                    var cmd = drawList.CmdBuffer[cmdI];
+
+                    GL.BindTexture(TextureTarget.Texture2D, (uint) cmd.TextureId);
+
+                    Vector4 clipRect = default;
+                    clipRect.X = (cmd.ClipRect.X - clipOff.X) * clipScale.X;
+                    clipRect.Y = (cmd.ClipRect.Y - clipOff.Y) * clipScale.Y;
+                    clipRect.Z = (cmd.ClipRect.Z - clipOff.X) * clipScale.X;
+                    clipRect.W = (cmd.ClipRect.W - clipOff.Y) * clipScale.Y;
+
+                    GL.Scissor((int) clipRect.X, (int) (fbH - clipRect.W), (int) (clipRect.Z - clipRect.X),
+                        (int) (clipRect.W - clipRect.Y));
+
+                    IntPtr adjustedVB = drawList.VtxBuffer.Data + (nint) (sizeof(ImDrawVert) * cmd.VtxOffset);
+
+                    GL.VertexPointer(2, VertexPointerType.Float, sizeof(ImDrawVert), adjustedVB);
+                    GL.TexCoordPointer(2, TexCoordPointerType.Float, sizeof(ImDrawVert), adjustedVB + 8);
+                    GL.ColorPointer(4, ColorPointerType.UnsignedByte, sizeof(ImDrawVert), adjustedVB + 16);
+
+                    GL.DrawElements(PrimitiveType.Triangles, (int) cmd.ElemCount,
+                        DrawElementsType.UnsignedShort,
+                        drawList.IdxBuffer.Data + (nint) (cmd.IdxOffset * 2));
+                }
+            }
+
+            _window.SwapBuffers();
+        }
+
+        private static readonly DebugProcArb GLDebugCallbackDelegate = GLDebugCallback;
+
+        private static void GLDebugCallback(DebugSource source, DebugType type, int id, DebugSeverity severity,
+            int length, IntPtr message, IntPtr userParam)
+        {
+            var msg = Encoding.UTF8.GetString((byte*) message, length);
+
+            if (severity == DebugSeverity.DebugSeverityNotification)
+                return;
+
+            Console.WriteLine($"[{type}][{severity}] {source}: {msg}");
+        }
+    }
+}