From 953b9137cc43ffc2bc9862bcec34893cb996feaa Mon Sep 17 00:00:00 2001
From: Harrison <yunyangdeng@gmail.com>
Date: Sat, 28 Dec 2019 14:35:35 -0600
Subject: [PATCH] Added shader handler.

---
 .../Graphics/Render/Shader/Shader.cs          | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 RecrownedAthenaeum/Graphics/Render/Shader/Shader.cs

diff --git a/RecrownedAthenaeum/Graphics/Render/Shader/Shader.cs b/RecrownedAthenaeum/Graphics/Render/Shader/Shader.cs
new file mode 100644
index 0000000..9e6d4fb
--- /dev/null
+++ b/RecrownedAthenaeum/Graphics/Render/Shader/Shader.cs
@@ -0,0 +1,76 @@
+using System;
+using System.IO;
+using System.Text;
+using OpenTK.Graphics.OpenGL;
+namespace RecrownedAthenaeum.Graphics.Render.Shader {
+    public class Shader : IDisposable {
+        int handle;
+        public bool IsDisposed {
+            get;
+            private set;
+        }
+        public Shader(string vertexPath, string fragmentPath) {
+            IsDisposed = false;
+            
+            int vertShader = 0;
+            int fragShader = 0;
+
+            string vertShaderSource;
+            string fragShaderSource;
+
+            using (StreamReader stream = new StreamReader(vertexPath, Encoding.UTF8)) {
+                vertShaderSource = stream.ReadToEnd();
+            }
+            using (StreamReader stream = new StreamReader(fragmentPath, Encoding.UTF8)) {
+                fragShaderSource = stream.ReadToEnd();
+            }
+
+            vertShader = GL.CreateShader(ShaderType.VertexShader);
+            GL.ShaderSource(vertShader, vertShaderSource);
+            fragShader = GL.CreateShader(ShaderType.FragmentShader);
+            GL.ShaderSource(fragShader, fragShaderSource);
+
+            string log;
+            GL.CompileShader(vertShader);
+            if ((log = GL.GetShaderInfoLog(vertShader)) == "") {
+                throw new ArgumentException("Error while compiling vertex shader: " + log, "vertexPath");
+            }
+            GL.CompileShader(fragShader);
+            if ((log = GL.GetShaderInfoLog(fragShader)) == "") {
+                throw new ArgumentException("Error while compiling fragment shader: " + log, "fragmentPath");
+            }
+            handle = GL.CreateProgram();
+            GL.AttachShader(handle, vertShader);
+            GL.AttachShader(handle, fragShader);
+            GL.LinkProgram(handle);
+            GL.DetachShader(handle, vertShader);
+            GL.DetachShader(handle, fragShader);
+            GL.DeleteShader(vertShader);
+            GL.DeleteShader(fragShader);
+        }
+
+        public void Use() {
+            GL.UseProgram(handle);
+        }
+
+        protected virtual void Dispose(bool disposing) {
+            if (IsDisposed) {
+                return;
+            }
+            
+            if (disposing) {
+            }
+            GL.DeleteProgram(handle);
+            IsDisposed = true;
+        }
+        
+        public void Dispose() {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        ~Shader() {
+            Dispose(false);
+        }
+    }
+}
\ No newline at end of file