protected override void OnLoad()
{
base.OnLoad();
// initialize and bind framebuffer
_framebuffer = new Framebuffer();
_framebuffer.Bind(FramebufferTarget.Framebuffer);
// initialize a renderbuffer and bind it to the depth attachment
// to support depth testing while rendering to the texture
_depthBuffer = new Renderbuffer();
_depthBuffer.Init(RenderbufferStorage.DepthComponent, FramebufferWidth, FramebufferHeight);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, _depthBuffer);
// initialize texture and bind it to the color attachment
_texture = new Texture2D(SizedInternalFormat.Rgba8, FramebufferWidth, FramebufferHeight, 1);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, _texture);
Framebuffer.Unbind(FramebufferTarget.Framebuffer);
// initialize shaders
_colorProgram = ProgramFactory.Create <SimpleColorProgram>();
_textureProgram = ProgramFactory.Create <SimpleTextureProgram>();
// initialize demonstration geometry
_cube = ShapeBuilder.CreateColoredCube(_colorProgram.InPosition, _colorProgram.InColor);
_quad = ShapeBuilder.CreateTexturedQuad(_textureProgram.InPosition, _textureProgram.InTexCoord);
// set camera position
ActiveCamera.Position = new Vector3(0, 0, 3);
// enable depth testing
GL.Enable(EnableCap.DepthTest);
}
protected override void OnLoad()
{
base.OnLoad();
// initialize shader (load sources, create/compile/link shader program, error checking)
// when using the factory method the shader sources are retrieved from the ShaderSourceAttributes
_program = ProgramFactory.Create <SimpleColorProgram>();
// this program will be used all the time so just activate it once and for all
_program.Use();
//arbitrary black box to load mesh data
string jsonString = File.ReadAllText("./Data/Meshes/OpenTK.fakeformat");
MeshData meshData = JsonSerializer.Deserialize <MeshData>(jsonString);
Buffer <uint> IndexBuffer = new Buffer <uint>();
IndexBuffer.Init(BufferTarget.ElementArrayBuffer, meshData.Indices.Select(index => index - 1).ToArray());
Buffer <Vector3> VertBuffer = new Buffer <Vector3>();
VertBuffer.Init(BufferTarget.ArrayBuffer, Enumerable.Range(0, meshData.Vertices.Count / 3).Select(a => new Vector3(meshData.Vertices[a * 3], meshData.Vertices[a * 3 + 1], meshData.Vertices[a * 3 + 2])).ToArray());
//a bit of a hack, i wanted the mesh to have some visual depth.
//the only reason this works is I just happen to know the Z coordinate for the mesh is in a certain range
//other meshes will either look stupid or just throw exceptions because the color values are out of range
Buffer <uint> ColorBuffer = new Buffer <uint>();
ColorBuffer.Init(BufferTarget.ArrayBuffer, VertBuffer.Content.Select(vertex => (uint)Color.FromArgb((int)(vertex.Z * 500) + 100, (int)(vertex.Z * 500) + 100, (int)(vertex.Z * 500) + 100).ToArgb()).ToArray());
mesh = new DynamicShape()
.WithVertexAttrib(_program.InPosition, VertBuffer)
.WithVertexAttrib(_program.InColor, ColorBuffer)
.WithElementBuffer(IndexBuffer)
.WithDisposeFunction(() => {
VertBuffer?.Dispose();
IndexBuffer?.Dispose();
ColorBuffer?.Dispose();
})
.SetDrawFunction((VAO) => {
VAO.DrawElements(PrimitiveType.Triangles, IndexBuffer.ElementCount);
});
// set camera position
ActiveCamera.Position = new Vector3(0, 0, 3);
// set a nice clear color
GL.ClearColor(Color.MidnightBlue);
GL.Enable(EnableCap.DepthTest);
GL.Enable(EnableCap.CullFace);
GL.CullFace(CullFaceMode.Back);
}
private void OnLoad(object sender, EventArgs e)
{
// initialize and bind framebuffer
_framebuffer = new Framebuffer();
_framebuffer.Bind(FramebufferTarget.Framebuffer);
// initialize a renderbuffer and bind it to the depth attachment
// to support depth testing while rendering to the texture
_depthBuffer = new Renderbuffer();
_depthBuffer.Init(RenderbufferStorage.DepthComponent, FramebufferWidth, FramebufferHeight);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, _depthBuffer);
// initialize texture and bind it to the color attachment
_texture = new Texture2D(SizedInternalFormat.Rgba8, FramebufferWidth, FramebufferHeight, 1);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, _texture);
Framebuffer.Unbind(FramebufferTarget.Framebuffer);
// initialize demonstration geometry
_cube = new ColorCube();
_cube.UpdateBuffers();
_quad = new TexturedQuad();
_quad.UpdateBuffers();
// initialize shaders
_colorProgram = ProgramFactory.Create <SimpleColorProgram>();
_textureProgram = ProgramFactory.Create <SimpleTextureProgram>();
// set up vertex attributes for the cube
_cubeVao = new VertexArray();
_cubeVao.Bind();
_cubeVao.BindAttribute(_colorProgram.InPosition, _cube.VertexBuffer);
_cubeVao.BindAttribute(_colorProgram.InColor, _cube.ColorBuffer);
_cubeVao.BindElementBuffer(_cube.IndexBuffer);
// set up vertex attributes for the quad
_quadVao = new VertexArray();
_quadVao.Bind();
_quadVao.BindAttribute(_textureProgram.InPosition, _quad.VertexBuffer);
_quadVao.BindAttribute(_textureProgram.InTexCoord, _quad.TexCoordBuffer);
// set camera position
Camera.DefaultState.Position = new Vector3(0, 0, 3);
Camera.ResetToDefault();
// enable depth testing
GL.Enable(EnableCap.DepthTest);
}
