void RegenerateFramebuffer()
{
// Create our renderbuffer
_FramebufferColorBuffer = _Context.GenTexture();
_FramebufferColorBuffer.BindTexture(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D);
_FramebufferColorBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_MIN_FILTER, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_NEAREST);
_FramebufferColorBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_MAG_FILTER, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_NEAREST);
_FramebufferColorBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_WRAP_S, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_CLAMP_TO_BORDER);
_FramebufferColorBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_WRAP_T, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_CLAMP_TO_BORDER);
_FramebufferColorBuffer.TexImage2D(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, 0, Ratchet.Drawing.OpenGL.glTexture.InternalFormat.GL_RGBA, Width, Height, 0, Ratchet.Drawing.OpenGL.glTexture.Format.GL_RGBA, Ratchet.Drawing.OpenGL.glTexture.Type.GL_UNSIGNED_BYTE, null);
Ratchet.Drawing.OpenGL.glTexture depthBuffer = _Context.GenTexture();
depthBuffer.BindTexture(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D);
depthBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_MIN_FILTER, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_NEAREST);
depthBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_MAG_FILTER, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_NEAREST);
depthBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_WRAP_S, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_CLAMP_TO_BORDER);
depthBuffer.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_WRAP_T, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_CLAMP_TO_BORDER);
depthBuffer.TexImage2D(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, 0, Ratchet.Drawing.OpenGL.glTexture.InternalFormat.GL_DEPTH_COMPONENT, Width, Height, 0, Ratchet.Drawing.OpenGL.glTexture.Format.GL_DEPTH_COMPONENT, Ratchet.Drawing.OpenGL.glTexture.Type.GL_UNSIGNED_BYTE, null);
if (_Framebuffer != null)
{
_Framebuffer.Dispose();
}
_Framebuffer = _Context.GenFramebuffer();
_Framebuffer.BindFramebuffer(Ratchet.Drawing.OpenGL.glFramebuffer.BindTarget.GL_FRAMEBUFFER);
_Context.Viewport(0, 0, Width, Height);
_Framebuffer.AttachTexture(Ratchet.Drawing.OpenGL.glFramebuffer.BindTarget.GL_FRAMEBUFFER, Ratchet.Drawing.OpenGL.glFramebuffer.Attachment.GL_COLOR_ATTACHMENT0, _FramebufferColorBuffer, 0);
_Framebuffer.AttachTexture(Ratchet.Drawing.OpenGL.glFramebuffer.BindTarget.GL_FRAMEBUFFER, Ratchet.Drawing.OpenGL.glFramebuffer.Attachment.GL_DEPTH_ATTACHMENT, depthBuffer, 0);
_Context.DrawBuffers(new Ratchet.Drawing.OpenGL.glContext.DrawBufferMode[] { Ratchet.Drawing.OpenGL.glContext.DrawBufferMode.GL_COLOR_ATTACHMENT0 });
_Framebuffer.UnbindFramebuffer(Ratchet.Drawing.OpenGL.glFramebuffer.BindTarget.GL_FRAMEBUFFER);
}
private void Windows_Load(object sender, EventArgs e)
{
DoubleBuffered = false;
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, false);
SetStyle(ControlStyles.Opaque, true);
AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
Size = new Size(800, 600);
_WGLContext = Ratchet.Drawing.OpenGL.WGL.CreateContext(this);
_Context = Ratchet.Drawing.OpenGL.glContext.CreateContextFromWGLContext(_WGLContext);
_Context.MakeCurrent();
_Context.Enable(Ratchet.Drawing.OpenGL.glContext.Capability.GL_DEBUG_OUTPUT);
_Context.DebugMessageCallback((int source, int id, int type, int severity, string message) =>
{
Console.WriteLine(message);
});
_VertexBuffer = _Context.GenBuffer();
_VertexBuffer.BindBuffer(Ratchet.Drawing.OpenGL.glBuffer.BindTarget.GL_ARRAY_BUFFER);
float[] triangle = new float[] { -0.5f, -0.5f, 0.0f, 1.0f, // Vertex 1 Position
1.0f, 1.0f,
0.5f, -0.5f, 0.0f, 1.0f, // Vertex 2 Position
0.0f, 1.0f,
0.5f, 0.5f, 0.0f, 1.0f, // Vertex 3 Position
0.0f, 0.0f,
-0.5f, 0.5f, 0.0f, 1.0f, // Vertex 4 Position
1.0f, 0.0f, };
_VertexBuffer.BufferData(Ratchet.Drawing.OpenGL.glBuffer.BindTarget.GL_ARRAY_BUFFER, sizeof(float) * triangle.Length, triangle, Ratchet.Drawing.OpenGL.glBuffer.Usage.GL_STATIC_DRAW);
_IndexBuffer = _Context.GenBuffer();
_IndexBuffer.BindBuffer(Ratchet.Drawing.OpenGL.glBuffer.BindTarget.GL_ELEMENT_ARRAY_BUFFER);
_IndexBuffer.BufferData(Ratchet.Drawing.OpenGL.glBuffer.BindTarget.GL_ELEMENT_ARRAY_BUFFER, sizeof(int) * 6, new int[] { 0, 1, 2, 0, 2, 3 }, Ratchet.Drawing.OpenGL.glBuffer.Usage.GL_STATIC_DRAW);
System.Drawing.Bitmap image = (System.Drawing.Bitmap)System.Drawing.Bitmap.FromFile(@"./ratchet.png");
// Create a new texture
_Texture = _Context.GenTexture();
// Bind the texture we have created to Texture 2D in sampler 0 in order to configure it
// At that point configuring the sampler to use sampler 0 is not needed but we do it for consistency
_Context.ActiveTexture(0);
_Texture.BindTexture(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D);
var lockRegion = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
Swap_BGRA_RGBA(lockRegion.Scan0, image.Width * image.Height);
_Texture.TexImage2D(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, 0, Ratchet.Drawing.OpenGL.glTexture.InternalFormat.GL_RGBA, image.Width, image.Height, 0, Ratchet.Drawing.OpenGL.glTexture.Format.GL_RGBA, Ratchet.Drawing.OpenGL.glTexture.Type.GL_UNSIGNED_BYTE, lockRegion.Scan0);
image.UnlockBits(lockRegion);
// Filters needs to be set so the sampler can sample the texture correctly.
_Texture.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_MIN_FILTER, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_NEAREST);
_Texture.TexParameter(Ratchet.Drawing.OpenGL.glTexture.BindTarget.GL_TEXTURE_2D, Ratchet.Drawing.OpenGL.glTexture.Parameter.GL_TEXTURE_MAG_FILTER, Ratchet.Drawing.OpenGL.glTexture.ParameterValue.GL_NEAREST);
var vertexShader = _Context.CreateShader(Ratchet.Drawing.OpenGL.glShader.Type.GL_VERTEX_SHADER, vertexShaderSource);
var fragmentShader = _Context.CreateShader(Ratchet.Drawing.OpenGL.glShader.Type.GL_FRAGMENT_SHADER, fragmentShaderSource);
_Shader = _Context.CreateProgram();
_Shader.AttachShader(vertexShader);
_Shader.AttachShader(fragmentShader);
// If you wish to specify the bind location manually you can do so
// before linking
// _Shader.BindAttribLocation(0, "in_Position");
// _Shader.BindAttribLocation(1, "in_textureCoord");
_Shader.LinkProgram();
_Context.Viewport(0, 0, Width, Height);
}