internal static void UniformMatrix(GraphicsLibrary gl, int uniform, Matrix4x4 matrix)
{
unsafe
{
var t = stackalloc float[16];
t[0] = matrix.M11; t[1] = matrix.M12; t[2] = matrix.M13; t[3] = matrix.M14;
t[4] = matrix.M21; t[5] = matrix.M22; t[6] = matrix.M23; t[7] = matrix.M24;
t[8] = matrix.M31; t[9] = matrix.M32; t[10] = matrix.M33; t[11] = matrix.M34;
t[12] = matrix.M41; t[13] = matrix.M42; t[14] = matrix.M43; t[15] = matrix.M44;
gl.UniformMatrix4fv(uniform, 1, Boolean.False, t);
}
}
private static unsafe string GetShaderHeader(GraphicsLibrary gl)
{
if (shaderHeader == null)
{
string?s = Marshal.PtrToStringAnsi(new IntPtr(gl.GetString(StringParameter.ShadingLanguageVersion)));
if (s != null && s.StartsWith("4."))
{
shaderHeader = "#version 4" + s.Substring(2, 2) + " core\n";
}
else
{
shaderHeader = "#version 300 es\nprecision mediump float;\n";
}
}
return(shaderHeader);
}
internal static unsafe uint LoadShader(GraphicsLibrary gl, ShaderType type, string source)
{
var shader = gl.CreateShader(type);
var header = GetShaderHeader(gl);
var byteCount = Encoding.UTF8.GetMaxByteCount(header.Length);
byteCount += Encoding.UTF8.GetMaxByteCount(source.Length);
if (byteCount + 1 > byteBuffer.Length)
{
byteBuffer = new byte[byteCount + 1];
}
byteCount = Encoding.UTF8.GetBytes(header, 0, header.Length, byteBuffer, 0);
byteCount += Encoding.UTF8.GetBytes(source, 0, source.Length, byteBuffer, byteCount);
byteBuffer[byteCount] = 0;
fixed(byte *p = byteBuffer)
{
byte *t = p;
gl.ShaderSource(shader, 1, &t, null);
}
gl.CompileShader(shader);
int len;
gl.GetShaderiv(shader, ShaderParameter.InfoLogLength, &len);
if (len > 1)
{
var buffer = new byte[len];
fixed(byte *p = buffer)
{
gl.GetShaderInfoLog(shader, len, &len, p);
Console.WriteLine("Shader Compiler message: " + Marshal.PtrToStringAnsi(new IntPtr(p)));
}
}
int cs;
gl.GetShaderiv(shader, ShaderParameter.CompileStatus, &cs);
if (cs == 0)
{
gl.DeleteShader(shader);
throw new Exception("Shader compilation error");
}
return(shader);
}
internal static unsafe void LinkProgram(GraphicsLibrary gl, uint program)
{
gl.LinkProgram(program);
int ls;
gl.GetProgramiv(program, ProgramParameter.LinkStatus, &ls);
if (ls == 0)
{
int len;
gl.GetProgramiv(program, ProgramParameter.InfoLogLength, &len);
if (len > 1)
{
var buffer = new byte[len];
fixed(byte *p = buffer)
{
gl.GetProgramInfoLog(program, len, &len, p);
Console.WriteLine("Shader link message: " + Marshal.PtrToStringAnsi(new IntPtr(p)));
}
}
gl.DeleteProgram(program);
throw new Exception("Link error");
}
}
internal static void TexImage2D(GraphicsLibrary gl, RasterImage image, TextureTarget2D target, int level)
{
TexturePixelFormat textureFormat;
PixelFormat format;
if (image.Format == RasterImageFormat.TrueColor)
{
textureFormat = TexturePixelFormat.Rgb8;
format = PixelFormat.Rgb;
}
else
{
textureFormat = TexturePixelFormat.Rgba8;
format = PixelFormat.Rgba;
}
unsafe
{
fixed(byte *p = image.Data)
{
var(width, height) = image.Size;
gl.TexImage2D(target, level, textureFormat, width, height, 0, format, PixelType.UnsignedByte, new IntPtr(p));
}
}
}
internal unsafe void Launch()
{
Console.WriteLine("Draw Texture...");
var image = new RasterImage();
var namePrefix = typeof(DrawTextureLauncher).Namespace + ".Resources.";
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(namePrefix + "kitten.bmp"))
{
image.LoadBmp(stream ?? throw new InvalidOperationException());
}
using var windowServer = new WindowServer();
using var renderingContext = new RenderingContext();
using var window = windowServer.CreateWindow(renderingContext);
window.BorderStyle = WindowBorderStyle.Sizable;
renderingContext.CurrentWindow = window;
window.MinimumSize = (400, 300);
window.MaximumSize = (600, 500);
window.Size = (450, 350);
window.Opacity = 0.8;
var gl = new GraphicsLibrary(renderingContext);
gl.ClearColor(0.0f, 0.0f, 0.0f, 1.0f);
var program = gl.CreateProgram();
var vertexShader = OpenGLHelper.LoadShader(gl, ShaderType.Vertex, @"
in vec2 position;
in vec3 color;
in vec2 texCoord;
out vec3 fColor;
out vec2 fTexCoord;
void main() {
gl_Position = vec4(position, 0.0, 1.0);
fColor = color;
fTexCoord = texCoord;
}
");
gl.AttachShader(program, vertexShader);
var fragmentShader = OpenGLHelper.LoadShader(gl, ShaderType.Fragment, @"
in vec3 fColor;
in vec2 fTexCoord;
out vec4 outColor;
uniform sampler2D tex;
void main() {
outColor = texture(tex, fTexCoord) * vec4(fColor, 1.0);
}
");
gl.AttachShader(program, fragmentShader);
var position = 0u;
OpenGLHelper.BindAttribLocation(gl, program, position, "position");
var color = 1u;
OpenGLHelper.BindAttribLocation(gl, program, color, "color");
var texCoord = 2u;
OpenGLHelper.BindAttribLocation(gl, program, texCoord, "texCoord");
OpenGLHelper.LinkProgram(gl, program);
uint h;
gl.GenVertexArrays(1, &h);
uint vertexArray = h;
gl.BindVertexArray(vertexArray);
float[] vertices = new float[] {
-0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // Top-left
0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // Top-right
0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // Bottom-right
-0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f // Bottom-left
};
gl.GenBuffers(1, &h);
uint vertexBuffer = h;
gl.BindBuffer(BufferTarget.Array, vertexBuffer);
OpenGLHelper.BufferData(gl, BufferTarget.Array, vertices, BufferUsage.StaticDraw);
var elements = new ushort[] {
0, 1, 2,
2, 3, 0
};
gl.GenBuffers(1, &h);
uint elementBuffer = h;
gl.BindBuffer(BufferTarget.ElementArray, elementBuffer);
OpenGLHelper.BufferData(gl, BufferTarget.ElementArray, elements, BufferUsage.StaticDraw);
gl.UseProgram(program);
var stride = sizeof(float) * 7;
gl.EnableVertexAttribArray(position);
gl.VertexAttribPointer(position, 2, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero);
gl.EnableVertexAttribArray(color);
gl.VertexAttribPointer(color, 3, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero + 2 * sizeof(float));
gl.EnableVertexAttribArray(texCoord);
gl.VertexAttribPointer(texCoord, 2, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero + 5 * sizeof(float));
gl.GenTextures(1, &h);
var texture = h;
gl.ActiveTexture(TextureUnit.Texture0);
gl.BindTexture(TextureTarget.Texture2d, texture);
OpenGLHelper.TexImage2D(gl, image, TextureTarget2D.Texture2d, 0);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureWrapS, (int)TextureParameterValue.ClampToEdge);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureWrapT, (int)TextureParameterValue.ClampToEdge);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureMinFilter, (int)TextureParameterValue.Linear);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureMagFilter, (int)TextureParameterValue.Linear);
var tex = OpenGLHelper.GetUniformLocation(gl, program, "tex");
gl.Uniform1i(tex, 0);
window.Closed += (sender, e) => {
uint t = texture;
gl.DeleteTextures(1, &t);
gl.DeleteProgram(program);
gl.DeleteShader(vertexShader);
gl.DeleteShader(fragmentShader);
t = vertexBuffer;
gl.DeleteBuffers(1, &t);
t = elementBuffer;
gl.DeleteBuffers(1, &t);
t = vertexArray;
gl.DeleteVertexArrays(1, &t);
};
void draw()
{
var(width, height) = window.ViewportSize;
gl.Viewport(0, 0, (int)width, (int)height);
gl.Clear(Buffers.Color);
gl.DrawElements(DrawMode.Triangles, 6, DrawIndexType.UnsignedShort, IntPtr.Zero);
renderingContext.SwapBuffers(window);
}
window.Resize += (sender, e) => draw();
window.Visible = true;
while (windowServer.Windows.Count > 0)
{
draw();
windowServer.ProcessEvents(0.02);
}
Console.WriteLine("Draw Texture done.");
}
internal void Launch()
{
Console.WriteLine("Terrain...");
Console.WriteLine(" Press Esc to exit.");
Console.WriteLine(" Press W, Q, S, D, Space to move.");
using var windowServer = new WindowServer();
using var renderingContext = new RenderingContext { Settings = new RenderingSettings { Samples = 4 } };
using var window = windowServer.CreateWindow(renderingContext);
window.Title = "Terrain";
window.BorderStyle = WindowBorderStyle.Sizable;
const double WindowWidth = 1024;
const double WindowHeight = 768;
window.Size = (WindowWidth, WindowHeight);
renderingContext.CurrentWindow = window;
var gl = new GraphicsLibrary(renderingContext);
gl.ClearColor(0, 0, 0, 1);
using (var scene = new Scene(gl))
{
var imageLength = 16 * 16 * 3;
var buffer = new byte[imageLength * 3];
var image = new RasterImage();
var namePrefix = typeof(TerrainLauncher).Namespace + ".Resources.";
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(namePrefix + "grass.png"))
{
image.LoadPng(stream ?? throw new InvalidOperationException());
}
Array.Copy(image.Data, 0, buffer, 0, imageLength);
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(namePrefix + "grass_side.png"))
{
image.LoadPng(stream ?? throw new InvalidOperationException());
}
Array.Copy(image.Data, 0, buffer, imageLength, imageLength);
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(namePrefix + "dirt.png"))
{
image.LoadPng(stream ?? throw new InvalidOperationException());
}
Array.Copy(image.Data, 0, buffer, imageLength * 2, imageLength);
scene.AddTextureMap(buffer, 3);
var viewportSize = window.ViewportSize;
scene.SetViewport(0, 0, (int)viewportSize.width, (int)viewportSize.height);
(double x, double y)previousPoint = (-1d, -1d);
window.MouseMove += (sender, e) =>
{
if (previousPoint.x != -1d || previousPoint.y != -1d)
{
scene.Rotate((float)(e.Position.x - previousPoint.x), (float)(e.Position.y - previousPoint.y));
}
previousPoint = e.Position;
};
void draw()
{
scene.Render();
renderingContext.SwapBuffers(window);
}
window.Resize += (sender, e) =>
{
var(width, height) = window.ViewportSize;
scene.SetViewport(0, 0, (int)width, (int)height);
draw();
};
window.FramebufferResize += (sender, e) =>
{
var(width, height) = window.ViewportSize;
scene.SetViewport(0, 0, (int)width, (int)height);
};
window.Closed += (sender, e) =>
{
scene.Dispose();
};
var stopWatch = new Stopwatch();
stopWatch.Start();
var lastTime = stopWatch.ElapsedMilliseconds / 1e3f;
var deltaTime = 0.0f;
window.FreeLookMouse = true;
//renderingContext.SyncWithVerticalBlank(window, false);
Console.WriteLine("Press 'Esc' to quit.");
window.Visible = true;
while (windowServer.Windows.Count > 0)
{
var currentTime = stopWatch.ElapsedMilliseconds / 1e3f;
deltaTime = currentTime - lastTime;
lastTime = currentTime;
if (window.IsKeyPressed(Keycode.W))
{
scene.MoveForward(deltaTime);
}
if (window.IsKeyPressed(Keycode.S))
{
scene.MoveBackward(deltaTime);
}
if (window.IsKeyPressed(Keycode.A))
{
scene.MoveLeft(deltaTime);
}
if (window.IsKeyPressed(Keycode.D))
{
scene.MoveRight(deltaTime);
}
if (window.IsKeyPressed(Keycode.Space))
{
scene.MoveUp(deltaTime);
}
if (window.IsKeyPressed(Keycode.Escape))
{
window.Close();
windowServer.ProcessEvents(0.0);
break;
}
draw();
windowServer.ProcessEvents(0.0);
}
stopWatch.Stop();
}
Console.WriteLine("Terrain done.");
}
internal unsafe void Launch()
{
Console.WriteLine("Rotate Cube...");
var image = new RasterImage();
var namePrefix = typeof(DrawTextureLauncher).Namespace + ".Resources.";
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(namePrefix + "kitten.png"))
{
image.LoadPng(stream ?? throw new InvalidOperationException());
}
using var windowServer = new WindowServer();
using var renderingContext = new RenderingContext();
using var window = windowServer.CreateWindow(renderingContext);
window.BorderStyle = WindowBorderStyle.Sizable;
window.Title = "Rotate Cube...";
renderingContext.CurrentWindow = window;
var gl = new GraphicsLibrary(renderingContext);
gl.ClearColor(0, 0, 0, 1);
var program = gl.CreateProgram();
var vertexShader = OpenGLHelper.LoadShader(gl, ShaderType.Vertex, @"
in vec3 position;
in vec3 color;
in vec2 texCoord;
out vec3 fColor;
out vec2 fTexCoord;
uniform mat4 model;
uniform mat4 view;
uniform mat4 proj;
void main() {
gl_Position = proj * view * model * vec4(position, 1.0);
fColor = color;
fTexCoord = texCoord;
}
");
gl.AttachShader(program, vertexShader);
var fragmentShader = OpenGLHelper.LoadShader(gl, ShaderType.Fragment, @"
in vec3 fColor;
in vec2 fTexCoord;
out vec4 outColor;
uniform sampler2D tex;
void main() {
outColor = texture(tex, fTexCoord) * vec4(fColor, 1.0);
}
");
gl.AttachShader(program, fragmentShader);
var position = 0u;
OpenGLHelper.BindAttribLocation(gl, program, position, "position");
var color = 1u;
OpenGLHelper.BindAttribLocation(gl, program, color, "color");
var texCoord = 2u;
OpenGLHelper.BindAttribLocation(gl, program, texCoord, "texCoord");
OpenGLHelper.LinkProgram(gl, program);
uint h;
gl.GenVertexArrays(1, &h);
uint vertexArray = h;
gl.BindVertexArray(vertexArray);
var vertices = new float[] {
-0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f
};
gl.GenBuffers(1, &h);
uint vertexBuffer = h;
gl.BindBuffer(BufferTarget.Array, vertexBuffer);
OpenGLHelper.BufferData(gl, BufferTarget.Array, vertices, BufferUsage.StaticDraw);
var stride = sizeof(float) * 8;
gl.EnableVertexAttribArray(position);
gl.VertexAttribPointer(position, 3, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero);
gl.EnableVertexAttribArray(color);
gl.VertexAttribPointer(color, 3, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero + 3 * sizeof(float));
gl.EnableVertexAttribArray(texCoord);
gl.VertexAttribPointer(texCoord, 2, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero + 6 * sizeof(float));
gl.GenTextures(1, &h);
var texture = h;
gl.ActiveTexture(TextureUnit.Texture0);
gl.BindTexture(TextureTarget.Texture2d, texture);
OpenGLHelper.TexImage2D(gl, image, TextureTarget2D.Texture2d, 0);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureWrapS, (int)TextureParameterValue.ClampToEdge);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureWrapT, (int)TextureParameterValue.ClampToEdge);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureMinFilter, (int)TextureParameterValue.Linear);
gl.TexParameteri(TextureTarget.Texture2d, TextureParameteri.TextureMagFilter, (int)TextureParameterValue.Linear);
gl.UseProgram(program);
var tex = OpenGLHelper.GetUniformLocation(gl, program, "tex");
gl.Uniform1i(tex, 0);
var view = OpenGLHelper.GetUniformLocation(gl, program, "view");
var proj = OpenGLHelper.GetUniformLocation(gl, program, "proj");
var model = OpenGLHelper.GetUniformLocation(gl, program, "model");
var mat = Matrix4x4.CreateLookAt(new Vector3(1.5f, 1.5f, 1.5f), new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 1f));
OpenGLHelper.UniformMatrix(gl, view, mat);
mat = Matrix4x4.CreatePerspectiveFieldOfView((float)(Math.PI / 4), 1.3f, 1f, 10f);
OpenGLHelper.UniformMatrix(gl, proj, mat);
var viewportSize = window.ViewportSize;
var windowSize = window.Size;
renderingContext.CurrentWindow = null;
bool done = false;
float angle = 0f;
var drawLock = new object();
void draw()
{
var stopWatch = new Stopwatch();
stopWatch.Start();
var lastTime = stopWatch.ElapsedMilliseconds / 1e3f;
var deltaTime = 0.0f;
//renderingContext.SyncWithVerticalBlank(window, false);
renderingContext.CurrentWindow = window;
while (!done)
{
var currentTime = stopWatch.ElapsedMilliseconds / 1e3f;
deltaTime = currentTime - lastTime;
lastTime = currentTime;
gl.Viewport(0, 0, (int)viewportSize.width, (int)viewportSize.height);
gl.UseProgram(program);
angle += deltaTime;
mat = Matrix4x4.CreateFromAxisAngle(new Vector3(0f, 0f, 1f), angle);
OpenGLHelper.UniformMatrix(gl, model, mat);
gl.Enable(Capability.DepthTest);
gl.Clear(Buffers.Color | Buffers.Depth);
gl.BindVertexArray(vertexArray);
gl.BindBuffer(BufferTarget.Array, vertexBuffer);
gl.ActiveTexture(TextureUnit.Texture0);
gl.BindTexture(TextureTarget.Texture2d, texture);
gl.DrawArrays(DrawMode.Triangles, 0, 36);
gl.Disable(Capability.DepthTest);
renderingContext.SwapBuffers(window);
lock (drawLock)
{
Monitor.Wait(drawLock, 15);
}
}
renderingContext.CurrentWindow = null;
}
var drawThread = new Thread(draw);
window.Closed += (sender, e) => {
done = true;
drawThread.Join();
renderingContext.CurrentWindow = window;
uint t = texture;
gl.DeleteTextures(1, &t);
gl.DeleteProgram(program);
gl.DeleteShader(vertexShader);
gl.DeleteShader(fragmentShader);
t = vertexBuffer;
gl.DeleteBuffers(1, &t);
t = vertexArray;
gl.DeleteVertexArrays(1, &t);
};
window.Resize += (sender, e) =>
{
viewportSize = window.ViewportSize;
windowSize = window.Size;
lock (drawLock)
{
Monitor.Pulse(drawLock);
}
};
window.FramebufferResize += (sender, e) =>
{
viewportSize = window.ViewportSize;
lock (drawLock)
{
Monitor.Pulse(drawLock);
}
};
drawThread.Start();
window.Visible = true;
while (windowServer.Windows.Count > 0)
{
windowServer.ProcessEvents(-1);
}
Console.WriteLine("Rotate Cube done.");
}
internal unsafe void Launch()
{
Console.WriteLine("Draw Polygon...");
using var windowServer = new WindowServer();
using var renderingContext = new RenderingContext();
using var window = windowServer.CreateWindow(renderingContext);
renderingContext.CurrentWindow = window;
var gl = new GraphicsLibrary(renderingContext);
gl.ClearColor(0.0f, 0.0f, 0.0f, 1.0f);
Console.WriteLine(" GL VERSION: " + Marshal.PtrToStringAnsi(new IntPtr(gl.GetString(StringParameter.Version))));
Console.WriteLine("GLSL VERSION: " + Marshal.PtrToStringAnsi(new IntPtr(gl.GetString(StringParameter.ShadingLanguageVersion))));
Console.WriteLine(" GL VENDOR: " + Marshal.PtrToStringAnsi(new IntPtr(gl.GetString(StringParameter.Vendor))));
Console.WriteLine(" GL RENDERER: " + Marshal.PtrToStringAnsi(new IntPtr(gl.GetString(StringParameter.Renderer))));
var program = gl.CreateProgram();
var vertexShader = OpenGLHelper.LoadShader(gl, ShaderType.Vertex, @"
layout(location = 0) in vec2 vPosition;
layout(location = 1) in vec3 vColor;
out vec3 fColor;
void main() {
gl_Position = vec4(vPosition, 0.0, 1.0);
fColor = vColor;
}
");
gl.AttachShader(program, vertexShader);
var fragmentShader = OpenGLHelper.LoadShader(gl, ShaderType.Fragment, @"
in vec3 fColor;
out vec4 outColor;
void main() {
outColor = vec4(fColor, 1.0);
}
");
gl.AttachShader(program, fragmentShader);
const uint position = 0u;
const uint color = 1u;
OpenGLHelper.LinkProgram(gl, program);
uint h;
gl.GenVertexArrays(1, &h);
uint vertexArray = h;
gl.BindVertexArray(vertexArray);
gl.EnableVertexAttribArray(color);
gl.EnableVertexAttribArray(position);
var vertices = new float[] {
-0.5f, 0.5f, // Top-left
0.5f, 0.5f, // Top-right
0.5f, -0.5f, // Bottom-right
-0.5f, -0.5f, // Bottom-left
};
gl.GenBuffers(1, &h);
uint vertexBuffer1 = h;
gl.BindBuffer(BufferTarget.Array, vertexBuffer1);
OpenGLHelper.BufferData(gl, BufferTarget.Array, vertices, BufferUsage.StaticDraw);
var stride = sizeof(float) * 2;
gl.VertexAttribPointer(position, 2, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero);
vertices = new float[] {
1.0f, 0.0f, 0.0f, // Top-left
0.0f, 1.0f, 0.0f, // Top-right
0.0f, 0.0f, 1.0f, // Bottom-right
1.0f, 1.0f, 1.0f, // Bottom-left
};
gl.GenBuffers(1, &h);
uint vertexBuffer2 = h;
gl.BindBuffer(BufferTarget.Array, vertexBuffer2);
OpenGLHelper.BufferData(gl, BufferTarget.Array, vertices, BufferUsage.StaticDraw);
stride = sizeof(float) * 3;
gl.VertexAttribPointer(color, 3, AttributeElementType.Float, Boolean.False, stride, IntPtr.Zero);
var elements = new byte[] {
0, 1, 2,
2, 3, 0
};
gl.GenBuffers(1, &h);
uint elementBuffer = h;
gl.BindBuffer(BufferTarget.ElementArray, elementBuffer);
OpenGLHelper.BufferData(gl, BufferTarget.ElementArray, elements, BufferUsage.StaticDraw);
gl.UseProgram(program);
window.Closed += (sender, e) =>
{
gl.DeleteProgram(program);
gl.DeleteShader(vertexShader);
gl.DeleteShader(fragmentShader);
uint t = vertexBuffer1;
gl.DeleteBuffers(1, &t);
t = vertexBuffer2;
gl.DeleteBuffers(1, &t);
t = elementBuffer;
gl.DeleteBuffers(1, &t);
t = vertexArray;
gl.DeleteVertexArrays(1, &t);
};
window.Visible = true;
while (windowServer.Windows.Count > 0)
{
gl.Clear(Buffers.Color);
gl.DrawElements(DrawMode.Triangles, 6, DrawIndexType.UnsignedByte, IntPtr.Zero);
renderingContext.SwapBuffers(window);
windowServer.ProcessEvents(0.02);
}
Console.WriteLine("Draw Polygon done.");
}
