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Added pokemoen's Geometry Shader sample.

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the_fiddler 2009-08-20 22:15:54 +00:00
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commit 765c109b44
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Source/Examples/OpenGL/EXT/GeometryShader.cs Normal file
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#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2009 the Open Toolkit library.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#endregion
using System;
using System.Diagnostics;
using System.Drawing;
using OpenTK;
using OpenTK.Input;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace Examples.Tutorial
{
[Example("Basic Geometry Shader", ExampleCategory.OpenGL, "GLSL", Documentation = "Simple usage of EXT_geometry_shader4")]
public class SimpleGeometryShader : GameWindow
{
public SimpleGeometryShader()
: base(800, 600)
{
}
int shaderProgram = 0;
public override void OnLoad(EventArgs e)
{
if (!GL.GetString(StringName.Extensions).Contains("EXT_geometry_shader4"))
{
System.Windows.Forms.MessageBox.Show(
"Your video card does not support EXT_geometry_shader4. Please update your drivers.",
"EXT_geometry_shader4 not supported",
System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Exclamation);
Exit();
}
// create a shader object.
shaderProgram = GL.CreateProgram();
// create shader objects for all three types.
int vert = GL.CreateShader(ShaderType.VertexShader);
int frag = GL.CreateShader(ShaderType.FragmentShader);
int geom = GL.CreateShader(ShaderType.GeometryShaderExt);
// GLSL for fragment shader.
String fragSource = @"
void main( void )
{
gl_FragColor = vec4(0, 1, 0, 0);
}
";
// GLSL for vertex shader.
String vertSource = @"
void main( void )
{
gl_Position = ftransform();
}
";
// GLSL for geometry shader.
// Note this is a version 1.20 shader
// Also note GL_EXT_geometry_shader4 must be enabled explicitly, correct
// OpenGL implementations should only have the new tokens, like
// EmitVertex and EndPrimitive, when this extension is enabled.
String geomSource = @"
#version 120
#extension GL_EXT_geometry_shader4 : enable
void main(void)
{
// variable to use in for loops
int i;
// Emit the original vertices without changing, making
// this part exactly the same as if no geometry shader
// was used.
for(i=0; i< gl_VerticesIn; i++)
{
gl_Position = gl_PositionIn[i];
EmitVertex();
}
// End the one primitive with the original vertices
EndPrimitive();
// Now we generate some more! This translates 0.2 over
// the positive x axis.
for(i=0; i< gl_VerticesIn; i++)
{
gl_Position = gl_PositionIn[i];
gl_Position.x += 0.2;
EmitVertex();
}
EndPrimitive();
}
";
// compile shaders.
compileShader(frag, fragSource);
compileShader(vert, vertSource);
compileShader(geom, geomSource);
// attach shaders and link the program.
GL.AttachShader(shaderProgram, frag);
GL.AttachShader(shaderProgram, vert);
GL.AttachShader(shaderProgram, geom);
GL.LinkProgram(shaderProgram);
// output link info log.
string info;
GL.GetProgramInfoLog(shaderProgram, out info);
Debug.WriteLine(info);
// Set the input type of the primitives we are going to feed the geometry shader, this should be the same as
// the primitive type given to GL.Begin. If the types do not match a GL error will occur (todo: verify GL_INVALID_ENUM, on glBegin)
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryInputTypeExt, (int)All.Lines);
// Set the output type of the geometry shader. Becasue we input Lines we will output LineStrip(s).
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryOutputTypeExt, (int)All.LineStrip);
// We must tell the shader program how much vertices the geometry shader will output (at most).
// The simple way is to query the maximum and use that.
int tmp;
// Get the maximum amount of vertices into tmp.
GL.GetInteger((GetPName)ExtGeometryShader4.MaxGeometryOutputVerticesExt, out tmp);
// And feed amount that to the shader program. (0x0400 on a HD3850, with catalyst 9.8)
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryVerticesOutExt, tmp);
// Set clearcolor and bind the shader program.
GL.ClearColor(0.1f, 0.1f, 0.1f, 0.1f);
GL.UseProgram(shaderProgram);
// Set color to red. If the shader fails the fixed pipeline will be used and
// the lines will be red, if all is ok the fragment shader is used and they will be green.
GL.Color3(1.0f, 0, 0);
// Clean up resources. Note the program object is not deleted.
if (frag != 0)
GL.DeleteShader(frag);
if (vert != 0)
GL.DeleteShader(vert);
if (geom != 0)
GL.DeleteShader(geom);
}
/// <summary>
/// Helper method to avoid code duplication.
/// Compiles a shader and prints results using Debug.WriteLine.
/// </summary>
/// <param name="shader">A shader object, gotten from GL.CreateShader.</param>
/// <param name="source">The GLSL source to compile.</param>
void compileShader(int shader, string source)
{
GL.ShaderSource(shader, source);
GL.CompileShader(shader);
string info;
GL.GetShaderInfoLog(shader, out info);
Debug.WriteLine(info);
int compileResult;
GL.GetShader(shader, ShaderParameter.CompileStatus, out compileResult);
if (compileResult != 1)
{
Debug.WriteLine("Compile Error!");
Debug.WriteLine(source);
}
}
public override void OnUnload(EventArgs e)
{
if (shaderProgram != 0)
GL.DeleteProgram(shaderProgram);
base.OnUnload(e);
}
/// <summary>
/// Sets the viewport and projection matrix for orthographic projection.
/// </summary>
/// <param name="e">resize event args</param>
protected override void OnResize(EventArgs e)
{
GL.Viewport(0, 0, Width, Height);
// Set projection matrix
GL.MatrixMode(MatrixMode.Projection);
OpenTK.Matrix4 ortho = OpenTK.Matrix4.CreateOrthographicOffCenter(-1, 1, -1, 1, 1, -1);
GL.LoadMatrix(ref ortho);
// Set selector state back to matrix mode
GL.MatrixMode(MatrixMode.Modelview);
base.OnResize(e);
}
protected override void OnUpdateFrame(FrameEventArgs e)
{
base.OnUpdateFrame(e);
if (Keyboard[Key.Space])
{
ErrorCode err = GL.GetError();
//Console.WriteLine(err + " " + Glu.ErrorString((GluErrorCode)err));
Console.WriteLine("GL error code: {0}", err);
}
if (Keyboard[Key.Escape])
this.Exit();
}
protected override void OnRenderFrame(FrameEventArgs e)
{
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// draw two vertical lines
GL.Begin(BeginMode.Lines);
{
// line one
GL.Vertex2(-0.5f, -0.5f);
GL.Vertex2(-0.5f, 0.5f);
// line two
GL.Vertex2(0.5f, 0.5f);
GL.Vertex2(0.5f, -0.5f);
}
GL.End();
this.SwapBuffers();
}
#region public static void Main()
/// <summary>
/// Entry point of this example.
/// </summary>
[STAThread]
public static void Main()
{
using (SimpleGeometryShader example = new SimpleGeometryShader())
{
Utilities.SetWindowTitle(example);
example.Run(30.0, 0.0);
}
}
#endregion
}
}