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OpenGlPage.xaml.cs
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OpenGlPage.xaml.cs
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using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Runtime.InteropServices;
using Avalonia;
using Avalonia.Controls;
using Avalonia.OpenGL;
using Avalonia.OpenGL.Controls;
using Avalonia.Platform.Interop;
using Avalonia.Threading;
using static Avalonia.OpenGL.GlConsts;
// ReSharper disable StringLiteralTypo
namespace ControlCatalog.Pages
{
public class OpenGlPage : UserControl
{
}
public class OpenGlPageControl : OpenGlControlBase
{
private float _yaw;
public static readonly DirectProperty<OpenGlPageControl, float> YawProperty =
AvaloniaProperty.RegisterDirect<OpenGlPageControl, float>("Yaw", o => o.Yaw, (o, v) => o.Yaw = v);
public float Yaw
{
get => _yaw;
set => SetAndRaise(YawProperty, ref _yaw, value);
}
private float _pitch;
public static readonly DirectProperty<OpenGlPageControl, float> PitchProperty =
AvaloniaProperty.RegisterDirect<OpenGlPageControl, float>("Pitch", o => o.Pitch, (o, v) => o.Pitch = v);
public float Pitch
{
get => _pitch;
set => SetAndRaise(PitchProperty, ref _pitch, value);
}
private float _roll;
public static readonly DirectProperty<OpenGlPageControl, float> RollProperty =
AvaloniaProperty.RegisterDirect<OpenGlPageControl, float>("Roll", o => o.Roll, (o, v) => o.Roll = v);
public float Roll
{
get => _roll;
set => SetAndRaise(RollProperty, ref _roll, value);
}
private float _disco;
public static readonly DirectProperty<OpenGlPageControl, float> DiscoProperty =
AvaloniaProperty.RegisterDirect<OpenGlPageControl, float>("Disco", o => o.Disco, (o, v) => o.Disco = v);
public float Disco
{
get => _disco;
set => SetAndRaise(DiscoProperty, ref _disco, value);
}
private string _info = string.Empty;
public static readonly DirectProperty<OpenGlPageControl, string> InfoProperty =
AvaloniaProperty.RegisterDirect<OpenGlPageControl, string>("Info", o => o.Info, (o, v) => o.Info = v);
public string Info
{
get => _info;
private set => SetAndRaise(InfoProperty, ref _info, value);
}
private int _vertexShader;
private int _fragmentShader;
private int _shaderProgram;
private int _vertexBufferObject;
private int _indexBufferObject;
private int _vertexArrayObject;
private string GetShader(bool fragment, string shader)
{
var version = (GlVersion.Type == GlProfileType.OpenGL ?
RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? 150 : 120 :
100);
var data = "#version " + version + "\n";
if (GlVersion.Type == GlProfileType.OpenGLES)
data += "precision mediump float;\n";
if (version >= 150)
{
shader = shader.Replace("attribute", "in");
if (fragment)
shader = shader
.Replace("varying", "in")
.Replace("//DECLAREGLFRAG", "out vec4 outFragColor;")
.Replace("gl_FragColor", "outFragColor");
else
shader = shader.Replace("varying", "out");
}
data += shader;
return data;
}
private string VertexShaderSource => GetShader(false, @"
attribute vec3 aPos;
attribute vec3 aNormal;
uniform mat4 uModel;
uniform mat4 uProjection;
uniform mat4 uView;
varying vec3 FragPos;
varying vec3 VecPos;
varying vec3 Normal;
uniform float uTime;
uniform float uDisco;
void main()
{
float discoScale = sin(uTime * 10.0) / 10.0;
float distortionX = 1.0 + uDisco * cos(uTime * 20.0) / 10.0;
float scale = 1.0 + uDisco * discoScale;
vec3 scaledPos = aPos;
scaledPos.x = scaledPos.x * distortionX;
scaledPos *= scale;
gl_Position = uProjection * uView * uModel * vec4(scaledPos, 1.0);
FragPos = vec3(uModel * vec4(aPos, 1.0));
VecPos = aPos;
Normal = normalize(vec3(uModel * vec4(aNormal, 1.0)));
}
");
private string FragmentShaderSource => GetShader(true, @"
varying vec3 FragPos;
varying vec3 VecPos;
varying vec3 Normal;
uniform float uMaxY;
uniform float uMinY;
uniform float uTime;
uniform float uDisco;
//DECLAREGLFRAG
void main()
{
float y = (VecPos.y - uMinY) / (uMaxY - uMinY);
float c = cos(atan(VecPos.x, VecPos.z) * 20.0 + uTime * 40.0 + y * 50.0);
float s = sin(-atan(VecPos.z, VecPos.x) * 20.0 - uTime * 20.0 - y * 30.0);
vec3 discoColor = vec3(
0.5 + abs(0.5 - y) * cos(uTime * 10.0),
0.25 + (smoothstep(0.3, 0.8, y) * (0.5 - c / 4.0)),
0.25 + abs((smoothstep(0.1, 0.4, y) * (0.5 - s / 4.0))));
vec3 objectColor = vec3((1.0 - y), 0.40 + y / 4.0, y * 0.75 + 0.25);
objectColor = objectColor * (1.0 - uDisco) + discoColor * uDisco;
float ambientStrength = 0.3;
vec3 lightColor = vec3(1.0, 1.0, 1.0);
vec3 lightPos = vec3(uMaxY * 2.0, uMaxY * 2.0, uMaxY * 2.0);
vec3 ambient = ambientStrength * lightColor;
vec3 norm = normalize(Normal);
vec3 lightDir = normalize(lightPos - FragPos);
float diff = max(dot(norm, lightDir), 0.0);
vec3 diffuse = diff * lightColor;
vec3 result = (ambient + diffuse) * objectColor;
gl_FragColor = vec4(result, 1.0);
}
");
[StructLayout(LayoutKind.Sequential, Pack = 4)]
private struct Vertex
{
public Vector3 Position;
public Vector3 Normal;
}
private readonly Vertex[] _points;
private readonly ushort[] _indices;
private readonly float _minY;
private readonly float _maxY;
public OpenGlPageControl()
{
var name = typeof(OpenGlPage).Assembly.GetManifestResourceNames().First(x => x.Contains("teapot.bin"));
using (var sr = new BinaryReader(typeof(OpenGlPage).Assembly.GetManifestResourceStream(name)!))
{
var buf = new byte[sr.ReadInt32()];
sr.Read(buf, 0, buf.Length);
var points = new float[buf.Length / 4];
Buffer.BlockCopy(buf, 0, points, 0, buf.Length);
buf = new byte[sr.ReadInt32()];
sr.Read(buf, 0, buf.Length);
_indices = new ushort[buf.Length / 2];
Buffer.BlockCopy(buf, 0, _indices, 0, buf.Length);
_points = new Vertex[points.Length / 3];
for (var primitive = 0; primitive < points.Length / 3; primitive++)
{
var srci = primitive * 3;
_points[primitive] = new Vertex
{
Position = new Vector3(points[srci], points[srci + 1], points[srci + 2])
};
}
for (int i = 0; i < _indices.Length; i += 3)
{
Vector3 a = _points[_indices[i]].Position;
Vector3 b = _points[_indices[i + 1]].Position;
Vector3 c = _points[_indices[i + 2]].Position;
var normal = Vector3.Normalize(Vector3.Cross(c - b, a - b));
_points[_indices[i]].Normal += normal;
_points[_indices[i + 1]].Normal += normal;
_points[_indices[i + 2]].Normal += normal;
}
for (int i = 0; i < _points.Length; i++)
{
_points[i].Normal = Vector3.Normalize(_points[i].Normal);
_maxY = Math.Max(_maxY, _points[i].Position.Y);
_minY = Math.Min(_minY, _points[i].Position.Y);
}
}
}
private static void CheckError(GlInterface gl)
{
int err;
while ((err = gl.GetError()) != GL_NO_ERROR)
Console.WriteLine(err);
}
protected override unsafe void OnOpenGlInit(GlInterface GL)
{
CheckError(GL);
Info = $"Renderer: {GL.GetString(GL_RENDERER)} Version: {GL.GetString(GL_VERSION)}";
// Load the source of the vertex shader and compile it.
_vertexShader = GL.CreateShader(GL_VERTEX_SHADER);
Console.WriteLine(GL.CompileShaderAndGetError(_vertexShader, VertexShaderSource));
// Load the source of the fragment shader and compile it.
_fragmentShader = GL.CreateShader(GL_FRAGMENT_SHADER);
Console.WriteLine(GL.CompileShaderAndGetError(_fragmentShader, FragmentShaderSource));
// Create the shader program, attach the vertex and fragment shaders and link the program.
_shaderProgram = GL.CreateProgram();
GL.AttachShader(_shaderProgram, _vertexShader);
GL.AttachShader(_shaderProgram, _fragmentShader);
const int positionLocation = 0;
const int normalLocation = 1;
GL.BindAttribLocationString(_shaderProgram, positionLocation, "aPos");
GL.BindAttribLocationString(_shaderProgram, normalLocation, "aNormal");
Console.WriteLine(GL.LinkProgramAndGetError(_shaderProgram));
CheckError(GL);
// Create the vertex buffer object (VBO) for the vertex data.
_vertexBufferObject = GL.GenBuffer();
// Bind the VBO and copy the vertex data into it.
GL.BindBuffer(GL_ARRAY_BUFFER, _vertexBufferObject);
CheckError(GL);
var vertexSize = Marshal.SizeOf<Vertex>();
fixed (void* pdata = _points)
GL.BufferData(GL_ARRAY_BUFFER, new IntPtr(_points.Length * vertexSize),
new IntPtr(pdata), GL_STATIC_DRAW);
_indexBufferObject = GL.GenBuffer();
GL.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBufferObject);
CheckError(GL);
fixed (void* pdata = _indices)
GL.BufferData(GL_ELEMENT_ARRAY_BUFFER, new IntPtr(_indices.Length * sizeof(ushort)), new IntPtr(pdata),
GL_STATIC_DRAW);
CheckError(GL);
_vertexArrayObject = GL.GenVertexArray();
GL.BindVertexArray(_vertexArrayObject);
CheckError(GL);
GL.VertexAttribPointer(positionLocation, 3, GL_FLOAT,
0, vertexSize, IntPtr.Zero);
GL.VertexAttribPointer(normalLocation, 3, GL_FLOAT,
0, vertexSize, new IntPtr(12));
GL.EnableVertexAttribArray(positionLocation);
GL.EnableVertexAttribArray(normalLocation);
CheckError(GL);
}
protected override void OnOpenGlDeinit(GlInterface GL)
{
// Unbind everything
GL.BindBuffer(GL_ARRAY_BUFFER, 0);
GL.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
GL.BindVertexArray(0);
GL.UseProgram(0);
// Delete all resources.
GL.DeleteBuffer(_vertexBufferObject);
GL.DeleteBuffer(_indexBufferObject);
GL.DeleteVertexArray(_vertexArrayObject);
GL.DeleteProgram(_shaderProgram);
GL.DeleteShader(_fragmentShader);
GL.DeleteShader(_vertexShader);
}
static Stopwatch St = Stopwatch.StartNew();
protected override unsafe void OnOpenGlRender(GlInterface gl, int fb)
{
gl.ClearColor(0, 0, 0, 0);
gl.Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
gl.Enable(GL_DEPTH_TEST);
gl.Viewport(0, 0, (int)Bounds.Width, (int)Bounds.Height);
var GL = gl;
GL.BindBuffer(GL_ARRAY_BUFFER, _vertexBufferObject);
GL.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBufferObject);
GL.BindVertexArray(_vertexArrayObject);
GL.UseProgram(_shaderProgram);
CheckError(GL);
var projection =
Matrix4x4.CreatePerspectiveFieldOfView((float)(Math.PI / 4), (float)(Bounds.Width / Bounds.Height),
0.01f, 1000);
var view = Matrix4x4.CreateLookAt(new Vector3(25, 25, 25), new Vector3(), new Vector3(0, 1, 0));
var model = Matrix4x4.CreateFromYawPitchRoll(_yaw, _pitch, _roll);
var modelLoc = GL.GetUniformLocationString(_shaderProgram, "uModel");
var viewLoc = GL.GetUniformLocationString(_shaderProgram, "uView");
var projectionLoc = GL.GetUniformLocationString(_shaderProgram, "uProjection");
var maxYLoc = GL.GetUniformLocationString(_shaderProgram, "uMaxY");
var minYLoc = GL.GetUniformLocationString(_shaderProgram, "uMinY");
var timeLoc = GL.GetUniformLocationString(_shaderProgram, "uTime");
var discoLoc = GL.GetUniformLocationString(_shaderProgram, "uDisco");
GL.UniformMatrix4fv(modelLoc, 1, false, &model);
GL.UniformMatrix4fv(viewLoc, 1, false, &view);
GL.UniformMatrix4fv(projectionLoc, 1, false, &projection);
GL.Uniform1f(maxYLoc, _maxY);
GL.Uniform1f(minYLoc, _minY);
GL.Uniform1f(timeLoc, (float)St.Elapsed.TotalSeconds);
GL.Uniform1f(discoLoc, _disco);
CheckError(GL);
GL.DrawElements(GL_TRIANGLES, _indices.Length, GL_UNSIGNED_SHORT, IntPtr.Zero);
CheckError(GL);
if (_disco > 0.01)
RequestNextFrameRendering();
}
protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
{
if (change.Property == YawProperty || change.Property == RollProperty || change.Property == PitchProperty ||
change.Property == DiscoProperty)
RequestNextFrameRendering();
base.OnPropertyChanged(change);
}
}
}