// SetPersp sets this camera's Projection matrix to an perspective one.
//
// The view parameter is the viewing rectangle for the orthographic
// projection in window coordinates.
//
// The fov parameter is the Y axis field of view (e.g. some games use 75) to
// use.
//
// The near and far parameters describe the minimum closest and maximum
// furthest clipping points of the view frustum.
//
// Clients who need advanced control over how the perspective viewing frustum
// is set up may use this method's source as a reference (e.g. to change the
// center point, which this method sets at the center).
//
// Write access is required for this method to operate safely.
func (c *Camera) SetPersp(view image.Rectangle, fov, near, far float64) {
aspectRatio := float64(view.Dx()) / float64(view.Dy())
m := math.Mat4Perspective(fov, aspectRatio, near, far)
c.Projection = ConvertMat4(m)
}
// gfxLoop is responsible for drawing things to the window. This loop must be
// independent of the Chippy main loop.
func gfxLoop(w *chippy.Window, r gfx.Renderer) {
w.SetSize(640, 640)
w.SetPositionCenter(chippy.DefaultScreen())
glr := r.(*gl2.Renderer)
glr.UpdateBounds(image.Rect(0, 0, 640, 640))
// Create a perspective viewing frustum matrix.
width, height := 640, 640
aspectRatio := float64(width) / float64(height)
viewMat := gfx.ConvertMat4(math.Mat4Perspective(75.0, aspectRatio, 0.001, 1000.0))
// Create a camera.
camera := &gfx.Camera{
Object: new(gfx.Object),
Frustum: viewMat,
}
_ = camera
// Create a wireframe shader.
shader := &gfx.Shader{
Name: "wireframe shader",
GLSLVert: wireVert,
GLSLFrag: wireFrag,
Inputs: make(map[string]interface{}),
}
// Wait for the shader to load (not strictly required).
onLoad := make(chan *gfx.Shader, 1)
r.LoadShader(shader, onLoad)
<-onLoad
if shader.Loaded {
fmt.Println("Shader loaded")
} else {
fmt.Println(string(shader.Error))
}
// Create a triangle object.
triangle := &gfx.Object{
Shader: shader,
State: gfx.DefaultState,
Meshes: []*gfx.Mesh{
&gfx.Mesh{
Vertices: []gfx.Vec3{
// Top
{0, .9, 0},
{-.9, -.9, 0},
{.9, -.9, 0},
},
Colors: []gfx.Color{
// Top
{1, 0, 0, 0},
{0, 1, 0, 0},
{0, 0, 1, 0},
},
},
},
}
triangle.State.FaceCulling = gfx.NoFaceCulling
octree := gfx.NewOctree()
update := make(chan *gfx.Object)
go func() {
events := w.Events()
for {
e := <-events
kev, ok := e.(keyboard.TypedEvent)
if ok {
if kev.Rune == 'f' || kev.Rune == 'b' {
for i := 0; i < 100; i++ {
s := mySpatial{
aabb: randomAABB(0.1, 0.25),
}
if kev.Rune == 'b' {
s = mySpatial{
aabb: randomAABB(0.1, 0.5),
}
}
//s.aabb.Min.Z = -.1
//s.aabb.Max.Z = .1
//octree = gfx.NewOctree()
octree.Add(s)
//fmt.Println(s.AABB().Center(), s.AABB())
}
// Create new mesh and ask the renderer to load it.
newMesh := octreeMesh(octree)
onLoad := make(chan *gfx.Mesh, 1)
r.LoadMesh(newMesh, onLoad)
<-onLoad
// Take ownership of the triangle.
<-update
// Swap the mesh.
triangle.Meshes[0] = newMesh
// Give back ownership.
update <- triangle
}
if kev.Rune == 'q' {
// Take ownership of the triangle.
<-update
// Update rotation.
v, ok := triangle.Shader.Inputs["rx"]
rx := float32(0.0)
if ok {
rx = v.(float32)
}
rx += 0.1
triangle.Shader.Inputs["rx"] = rx
// Give back ownership.
update <- triangle
}
if kev.Rune == 's' || kev.Rune == 'S' {
fmt.Println("Writing screenshot to file...")
// Download the image from the graphics hardware and save
// it to disk.
complete := make(chan image.Image, 1)
r.Download(image.Rect(0, 0, 0, 0), complete)
img := <-complete // Wait for download to complete.
// Save to png.
f, err := os.Create("screenshot.png")
if err != nil {
log.Fatal(err)
}
err = png.Encode(f, img)
if err != nil {
log.Fatal(err)
}
fmt.Println("Wrote texture to screenshot.png")
}
}
}
}()
triangleDrawn := make(chan *gfx.Object, 1)
for {
// Clear the entire area (empty rectangle means "the whole area").
r.Clear(image.Rect(0, 0, 0, 0), gfx.Color{1, 1, 1, 1})
r.ClearDepth(image.Rect(0, 0, 0, 0), 1.0)
// See if someone else needs ownership of the triangle before we draw.
select {
case update <- triangle:
// Wait for them to give ownership back.
<-update
default:
}
// Draw the triangle to the screen.
r.Draw(image.Rect(0, 0, 0, 0), triangle, triangleDrawn)
// Render the whole frame.
r.Render()
select {
case <-triangleDrawn:
// Allow updates to the triangle if needed.
select {
case update <- triangle:
<-update
default:
}
}
}
}