static void Init()
{
int screenW = Screen.Width;
int screenH = Screen.Height;
Texture.DefaultMinFilter = TextureFilter.Nearest;
Texture.DefaultMagFilter = TextureFilter.Nearest;
//Load assets
var shader2D = Shader.FromFile("Assets/basic_2d.glsl");
var shader3D = Shader.FromFile("Assets/basic_3d_nobuffer.glsl");
var shaderG = Shader.FromFile("Assets/basic_3d_gbuffer.glsl");
var shaderDepth = Shader.FromFile("Assets/basic_3d_depth.glsl");
var shaderPos = Shader.FromFile("Assets/basic_3d_position.glsl");
var pinkSquare = new Texture2D("Assets/pink_square.png", true);
var mesh = Mesh3D.CreateBox(Vector3.One, Color4.White);
//var mesh = Mesh3D.CreateSphere(0.5f, 10, Color4.White);
//var mesh = Mesh3D.CreateCylinder(0.5f, 1f, 10, true);
//var mesh = Mesh3D.CreateCone(0.5f, 2f, 10);
//Create the g-buffer
var gDepth = new Texture2D(screenW, screenH, TextureFormat.Depth);
var gColor = new Texture2D(screenW, screenH, TextureFormat.RGB);
var gNormal = new Texture2D(screenW, screenH, TextureFormat.RGB16F);
var gZ = new Texture2D(screenW, screenH, TextureFormat.R32F);
var gBuffer = new RenderTarget(screenW, screenH, gDepth, gColor, gNormal, gZ);
//View
var scene = new Scene(screenW, screenH);
var viewRot = false;
var viewRotPos = Vector2.Zero;
//Create a model
var cube = new Model(mesh, pinkSquare);
cube.Scale = new Vector3(2f, 0.75f, 1f);
scene.Add(cube);
//Create a model
cube = new Model(mesh, pinkSquare);
cube.Scale = new Vector3(0.75f);
cube.Position = new Vector3(0f, 0.5f, -2f);
scene.Add(cube);
//Draw to buffer
var draw = new DrawCall(gBuffer, new Material(shaderG));
//Draw to screen
int w = screenW / 2;
int h = screenH / 2;
var toScreen = new DrawCall(new Material(shaderPos));
toScreen.Mesh = Mesh2D.CreateRect(new Rectangle(0, 0, w, h));
toScreen.Material.SetMatrix4x4("Matrix", Matrix4x4.CreateOrthographic(0f, screenW, 0, screenH, -1f, 1f));
toScreen.Material.SetTexture("ZBuffer", gDepth);
App.OnUpdate += Update;
App.OnRender += Render;
Update();
void Update()
{
//Pivoting
if (viewRot)
{
var move = Mouse.Position - viewRotPos;
if (move != Vector2.Zero)
{
scene.ViewAngle += move * 6f * Time.Delta;
viewRotPos = Mouse.Position;
}
if (!Mouse.LeftDown)
{
viewRot = false;
}
}
else if (Mouse.LeftPressed)
{
viewRot = true;
viewRotPos = Mouse.Position;
}
//Zooming
if (Mouse.ScrollY != 0)
{
scene.ViewDist -= Mouse.ScrollY * 10f * Time.Delta;
}
}
void Render()
{
int modelID = draw.Material.GetIndex("ModelMatrix");
int mvpID = draw.Material.GetIndex("ModelViewProjectionMatrix");
int textureID = draw.Material.GetIndex("Texture");
draw.Clear(0x1f171fff);
foreach (var model in scene.Models)
{
draw.Material.SetMatrix4x4(modelID, model.Matrix);
draw.Material.SetMatrix4x4(mvpID, model.MvpMatrix);
draw.Material.SetTexture(textureID, model.Texture);
draw.Mesh = model.Mesh;
draw.Perform(PrimitiveType.Triangles);
}
//toScreen.Perform(Color3.Black);
gBuffer.BlitTextureTo(null, 0, BlitFilter.Linear, new RectangleI(0, h, w, h));
gBuffer.BlitTextureTo(null, 1, BlitFilter.Linear, new RectangleI(w, h, w, h));
gBuffer.BlitTextureTo(null, 2, BlitFilter.Linear, new RectangleI(w, 0, w, h));
toScreen.Material.SetMatrix4x4("ProjMatrix", scene.ProjMatrix);
toScreen.Material.SetMatrix4x4("ViewMatrix", scene.ViewMatrix);
toScreen.Perform(PrimitiveType.Triangles);
}
}
