268 lines
8 KiB
C#
268 lines
8 KiB
C#
#region --- License ---
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/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
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* See license.txt for license info
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*/
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#endregion
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#region --- Using Directives ---
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Drawing;
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using System.Text;
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using System.Windows.Forms;
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using System.Threading;
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using OpenTK.OpenGL;
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using OpenTK;
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#endregion --- Using Directives ---
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namespace Examples.Tutorial
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{
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public class T10_GLSL_Cube : GameWindow, IExample
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{
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#region --- Fields ---
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#region Shaders
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string[] vertex_shader_source =
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{
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"void main() {",
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"gl_FrontColor = gl_Color;",
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"gl_Position = ftransform();",
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"}",
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};
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string[] fragment_shader_source =
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{
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"void main() { gl_FragColor = gl_Color; }\0"
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};
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#endregion
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static float angle;
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#endregion
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#region --- Constructors ---
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public T10_GLSL_Cube()
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{
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this.CreateWindow(new OpenTK.Platform.DisplayMode(800, 600));
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}
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#endregion
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#region public void Launch()
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/// <summary>
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/// Launches this example.
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/// </summary>
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/// <remarks>
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/// Provides a simple way for the example launcher to launch the examples.
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/// </remarks>
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public void Launch()
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{
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Run();
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}
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#endregion
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#region OnCreate
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/// <summary>
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/// This is the place to change window parameters.
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/// </summary>
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/// <param name="e">Not used.</param>
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public override void OnCreate(EventArgs e)
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{
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base.OnCreate(e);
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//Text =
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// GL.GetString(Enums.StringName.VENDOR) + " " +
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// GL.GetString(Enums.StringName.RENDERER) + " " +
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// GL.GetString(Enums.StringName.VERSION);
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}
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#endregion
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#region OnLoad
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/// <summary>
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/// This is the place to load resources that change little
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/// during the lifetime of the GameWindow. In this case, we
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/// check for GLSL support, and load the shaders.
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/// </summary>
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/// <param name="e">Not used.</param>
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public override void OnLoad(EventArgs e)
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{
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base.OnLoad(e);
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// Check for necessary capabilities:
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if (!GL.IsExtensionSupported("VERSION_2_0"))
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{
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MessageBox.Show("You need at least OpenGL 2.0 to run this example. Aborting.", "GLSL not supported",
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MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
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this.Exit();
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}
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GL.ClearColor(0.1f, 0.1f, 0.5f, 0.0f);
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GL.Enable(GL.Enums.EnableCap.DEPTH_TEST);
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uint vertex_shader_object, fragment_shader_object;
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int status;
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uint shader_program;
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vertex_shader_object = (uint)GL.CreateShader(GL.Enums.VERSION_2_0.VERTEX_SHADER);
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fragment_shader_object = (uint)GL.CreateShader(GL.Enums.VERSION_2_0.FRAGMENT_SHADER);
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GL.ShaderSource(vertex_shader_object, vertex_shader_source.Length, vertex_shader_source, (int[])null);
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GL.CompileShader(vertex_shader_object);
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GL.GetShaderv(vertex_shader_object, GL.Enums.VERSION_2_0.COMPILE_STATUS, out status);
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if (status != (int)GL.Enums.Boolean.TRUE)
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{
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int length = 0;
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GL.GetShaderv(vertex_shader_object, GL.Enums.VERSION_2_0.INFO_LOG_LENGTH, out length);
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StringBuilder info = new StringBuilder(length);
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GL.GetShaderInfoLog(vertex_shader_object, info.Capacity, out length, info);
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throw new Exception(info.ToString());
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}
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GL.ShaderSource(fragment_shader_object, fragment_shader_source.Length, fragment_shader_source, (int[])null);
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GL.CompileShader(fragment_shader_object);
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GL.GetShaderv(fragment_shader_object, GL.Enums.VERSION_2_0.COMPILE_STATUS, out status);
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if (status != (int)GL.Enums.Boolean.TRUE)
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{
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int length;
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GL.GetShaderv(vertex_shader_object, GL.Enums.VERSION_2_0.INFO_LOG_LENGTH, out length);
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StringBuilder info = new StringBuilder(length);
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GL.GetShaderInfoLog(fragment_shader_object, info.Capacity, out length, info);
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throw new Exception(info.ToString());
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}
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shader_program = (uint)GL.CreateProgram();
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GL.AttachShader(shader_program, fragment_shader_object);
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GL.AttachShader(shader_program, vertex_shader_object);
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GL.LinkProgram(shader_program);
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GL.UseProgram(shader_program);
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OnResize(new OpenTK.Platform.ResizeEventArgs(this.Width, this.Height));
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}
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#endregion
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#region OnResize
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protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
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{
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base.OnResize(e);
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GL.Viewport(0, 0, this.Width, this.Height);
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double ratio = 0.0;
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ratio = this.Width / (double)this.Height;
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GL.MatrixMode(GL.Enums.MatrixMode.PROJECTION);
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GL.LoadIdentity();
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Glu.Perspective(45.0, ratio, 1.0, 64.0);
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}
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#endregion
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#region OnUpdateFrame
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/// <summary>
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/// Occurs when it is time to update the next frame.
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/// </summary>
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/// <param name="e">Not used yet.</param>
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public override void OnUpdateFrame(EventArgs e)
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{
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base.OnUpdateFrame(e);
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if (Keyboard[0][OpenTK.Input.Key.Escape])
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{
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this.Exit();
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}
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GL.MatrixMode(GL.Enums.MatrixMode.MODELVIEW);
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GL.LoadIdentity();
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Glu.LookAt(
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0.0, 5.0, 5.0,
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0.0, 0.0, 0.0,
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0.0, 1.0, 0.0
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);
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GL.Rotatef(angle, 0.0f, 1.0f, 0.0f);
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angle += 0.05f;
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}
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#endregion
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#region OnRenderFrame
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public override void OnRenderFrame(EventArgs e)
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{
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base.OnRenderFrame(e);
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GL.Clear(GL.Enums.ClearBufferMask.COLOR_BUFFER_BIT | GL.Enums.ClearBufferMask.DEPTH_BUFFER_BIT);
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DrawCube();
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Context.SwapBuffers();
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Thread.Sleep(0);
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}
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#endregion
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#region private void DrawCube()
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private void DrawCube()
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{
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GL.Begin(GL.Enums.BeginMode.QUADS);
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GL.Color3(1.0f, 0.0f, 0.0f);
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GL.Vertex3(-1.0f, -1.0f, -1.0f);
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GL.Vertex3(-1.0f, 1.0f, -1.0f);
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GL.Vertex3(1.0f, 1.0f, -1.0f);
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GL.Vertex3(1.0f, -1.0f, -1.0f);
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GL.Color3(1.0f, 1.0f, 0.0f);
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GL.Vertex3(-1.0f, -1.0f, -1.0f);
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GL.Vertex3(1.0f, -1.0f, -1.0f);
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GL.Vertex3(1.0f, -1.0f, 1.0f);
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GL.Vertex3(-1.0f, -1.0f, 1.0f);
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GL.Color3(1.0f, 0.0f, 1.0f);
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GL.Vertex3(-1.0f, -1.0f, -1.0f);
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GL.Vertex3(-1.0f, -1.0f, 1.0f);
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GL.Vertex3(-1.0f, 1.0f, 1.0f);
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GL.Vertex3(-1.0f, 1.0f, -1.0f);
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GL.Color3(0.0f, 1.0f, 0.0f);
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GL.Vertex3(-1.0f, -1.0f, 1.0f);
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GL.Vertex3(1.0f, -1.0f, 1.0f);
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GL.Vertex3(1.0f, 1.0f, 1.0f);
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GL.Vertex3(-1.0f, 1.0f, 1.0f);
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GL.Color3(0.0f, 0.0f, 1.0f);
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GL.Vertex3(-1.0f, 1.0f, -1.0f);
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GL.Vertex3(-1.0f, 1.0f, 1.0f);
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GL.Vertex3(1.0f, 1.0f, 1.0f);
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GL.Vertex3(1.0f, 1.0f, -1.0f);
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GL.Color3(0.0f, 1.0f, 1.0f);
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GL.Vertex3(1.0f, -1.0f, -1.0f);
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GL.Vertex3(1.0f, 1.0f, -1.0f);
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GL.Vertex3(1.0f, 1.0f, 1.0f);
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GL.Vertex3(1.0f, -1.0f, 1.0f);
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GL.End();
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}
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#endregion
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}
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}
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