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 static DynamicShape CreateBasicCube(VertexAttrib VertexPositionAttrib)
{
Vector3[] Vertices = new[]
{
new Vector3(-1.0f, -1.0f, 1.0f),
new Vector3(1.0f, -1.0f, 1.0f),
new Vector3(1.0f, 1.0f, 1.0f),
new Vector3(-1.0f, 1.0f, 1.0f),
new Vector3(-1.0f, -1.0f, -1.0f),
new Vector3(1.0f, -1.0f, -1.0f),
new Vector3(1.0f, 1.0f, -1.0f),
new Vector3(-1.0f, 1.0f, -1.0f)
};
uint[] Indices = new uint[]
{
// front face
0, 1, 2, 2, 3, 0,
// top face
3, 2, 6, 6, 7, 3,
// back face
7, 6, 5, 5, 4, 7,
// left face
4, 0, 3, 3, 7, 4,
// bottom face
5, 1, 0, 0, 4, 5,
// right face
1, 5, 6, 6, 2, 1
};
Buffer <Vector3> VertexBuffer = new Buffer <Vector3>();
VertexBuffer.Init(BufferTarget.ArrayBuffer, Vertices);
Buffer <uint> IndexBuffer = new Buffer <uint>();
IndexBuffer.Init(BufferTarget.ElementArrayBuffer, Indices);
return(new DynamicShape()
.WithElementBuffer(IndexBuffer)
.WithVertexAttrib(VertexPositionAttrib, VertexBuffer)
.WithDisposeFunction(() => {
VertexBuffer?.Dispose();
IndexBuffer?.Dispose();
})
.SetDrawFunction((VertexArray VAO) => {
VAO.DrawElements(PrimitiveType.Triangles, IndexBuffer.ElementCount);
}));
}
