public void Run()
{
// Init
// -------------------------------------------
Gl.Initialize();
Glfw.Init();
Glfw.WindowHint(Hint.ClientApi, ClientApi.OpenGL);
Glfw.WindowHint(Hint.ContextVersionMajor, 4);
Glfw.WindowHint(Hint.ContextVersionMinor, 6);
Glfw.WindowHint(Hint.OpenglProfile, Profile.Core);
Glfw.WindowHint(Hint.Doublebuffer, true);
Glfw.WindowHint(Hint.Decorated, true);
Glfw.WindowHint(Hint.OpenglForwardCompatible, true);
var window = Glfw.CreateWindow(800, 600,
"Learn OpenGL Book", Monitor.None, Window.None);
if (window == Window.None)
{
Console.Error.WriteLine("Failed to create GLFW Window");
Glfw.Terminate();
return;
}
Glfw.MakeContextCurrent(window);
Glfw.SwapInterval(1);
Gl.Viewport(0, 0, 800, 600);
Glfw.SetFramebufferSizeCallback(window, OnViewportResize);
// -------------------------------------------
// Build and Compile our shader program
// ----------------------------------
// Vertex shader
var vertexShader = Gl.CreateShader(ShaderType.VertexShader);
Gl.ShaderSource(vertexShader, vertexShaderSource);
Gl.CompileShader(vertexShader);
// Fragment Shader
var fragmentShader = Gl.CreateShader(ShaderType.FragmentShader);
Gl.ShaderSource(fragmentShader, fragmentShaderSource);
Gl.CompileShader(fragmentShader);
// Link shaders
var shaderProgram = Gl.CreateProgram();
Gl.AttachShader(shaderProgram, vertexShader);
Gl.AttachShader(shaderProgram, fragmentShader);
Gl.LinkProgram(shaderProgram);
// Delete not useful shaders
Gl.DeleteShader(vertexShader);
Gl.DeleteShader(fragmentShader);
// Set up vertex data (and buffer(s)) and configure vertex attributes
var vao = Gl.GenVertexArray();
var vbo = Gl.GenBuffer();
var ebo = Gl.GenBuffer();
// bind the Vertex Array Object first, then bind and set vertex buffer(s), and then configure vertex attributes(s).
Gl.BindVertexArray(vao);
//
Gl.BindBuffer(BufferTarget.ArrayBuffer, vbo);
Gl.BufferData(BufferTarget.ArrayBuffer, (uint)(4 * vertices.Length), vertices, BufferUsage.StaticDraw);
Gl.BindBuffer(BufferTarget.ElementArrayBuffer, ebo);
Gl.BufferData(BufferTarget.ElementArrayBuffer, (uint)(4 * indices.Length), indices, BufferUsage.StaticDraw);
//
Gl.VertexAttribPointer(0, 3, VertexAttribType.Float, false, 3 * sizeof(float), IntPtr.Zero);
Gl.EnableVertexAttribArray(0);
// note that this is allowed, the call to glVertexAttribPointer registered VBO as the vertex attribute's bound vertex buffer object so afterwards we can safely unbind
Gl.BindBuffer(BufferTarget.ArrayBuffer, 0);
// You can unbind the VAO afterwards so other VAO calls won't accidentally modify this VAO, but this rarely happens. Modifying other
// VAOs requires a call to glBindVertexArray anyways so we generally don't unbind VAOs (nor VBOs) when it's not directly necessary.
Gl.BindVertexArray(0);
while (!Glfw.WindowShouldClose(window))
{
// Input
ProcessInput(window);
// Rendering
Gl.ClearColor(0.2f, 0.3f, 0.3f, 1.0f);
Gl.Clear(ClearBufferMask.ColorBufferBit);
// Draw rectangle
Gl.UseProgram(shaderProgram);
Gl.BindVertexArray(vao);
Gl.DrawElements(PrimitiveType.Triangles, 6, DrawElementsType.UnsignedInt, IntPtr.Zero);
// Check and call events and Swap Buffers
Glfw.SwapBuffers(window);
Glfw.PollEvents();
}
Gl.DeleteVertexArrays(vao);
Gl.DeleteBuffers(vbo);
Gl.DeleteBuffers(ebo);
Gl.DeleteProgram(shaderProgram);
Glfw.Terminate();
}
public void Bind()
{
Gl.BindVertexArray(_id);
}
public void Unbind()
{
Gl.BindVertexArray(0);
}
public void DrawRaw()
{
Gl.BindVertexArray(vao);
Gl.DrawElements(PrimitiveType.Triangles, Indices.Length, DrawElementsType.UnsignedInt, IntPtr.Zero);
Gl.BindVertexArray(0);
}
public override void Unbind()
{
Gl.BindVertexArray(0);
}
public override void Bind()
{
Gl.BindVertexArray(ID);
}
public void Bind()
{
Gl.BindVertexArray(m_RendererID);
}
private void unbindVao()
{
Gl.BindVertexArray(0);
}