func MainLoop(gs *gamestate.GameState, renderer *rendering.WorldRenderer) {
var frames int
time := float32(sdl.GetTicks()) / 1000
window := gs.Window
running := true
for running {
currentTime := float32(sdl.GetTicks()) / 1000
if currentTime > time+1 {
gs.Fps = float32(frames)
frames = 0
time = currentTime
}
frames += 1
running = Input(gs, renderer)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.Disable(gl.BLEND)
simulation.Simulate(gs, renderer.ParticleSystem)
renderer.View = gs.Camera.View()
renderer.Render(gs.World, &gs.Options, window)
tw.Draw()
sdl.GL_SwapWindow(window)
helpers.UpdateManagers()
}
}
func main() {
var winTitle string = "Go-SDL2 + Go-GL"
var winWidth, winHeight int = 800, 600
var window *sdl.Window
var context sdl.GLContext
var event sdl.Event
var running bool
var err error
if err = sdl.Init(sdl.INIT_EVERYTHING); err != nil {
panic(err)
}
defer sdl.Quit()
if err = gl.Init(); err != nil {
panic(err)
}
window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_OPENGL)
if err != nil {
panic(err)
}
defer window.Destroy()
context, err = sdl.GL_CreateContext(window)
if err != nil {
panic(err)
}
defer sdl.GL_DeleteContext(context)
gl.Enable(gl.DEPTH_TEST)
gl.ClearColor(0.2, 0.2, 0.3, 1.0)
gl.ClearDepth(1)
gl.DepthFunc(gl.LEQUAL)
gl.Viewport(0, 0, int32(winWidth), int32(winHeight))
running = true
for running {
for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
fmt.Printf("[%d ms] MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
}
}
drawgl()
sdl.GL_SwapWindow(window)
}
}
func windowLoop(window *sdl.Window) {
data := &renderData{}
data.renderSections = true
data.zoom = -250
data.nodes = loadTree("cmd/packer/test.priv.oct")
data.box = genBox()
defer gl.DeleteLists(data.box, 1)
buttonDown := false
t := float64(sdl.GetTicks())
for {
ticks := float64(sdl.GetTicks()) * 0.001
dt := ticks - t
t = ticks
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
return
case *sdl.KeyDownEvent:
switch t.Keysym.Sym {
case sdl.K_ESCAPE:
return
case sdl.K_SPACE:
data.renderSections = !data.renderSections
case sdl.K_PLUS:
data.minNodeSize += 1.0
case sdl.K_MINUS:
data.minNodeSize -= 1.0
}
case *sdl.MouseButtonEvent:
if t.State == 1 {
buttonDown = true
} else {
buttonDown = false
}
case *sdl.MouseMotionEvent:
if buttonDown {
data.xrot += dt * float64(t.YRel) * rotSpeed
data.yrot += dt * float64(t.XRel) * rotSpeed
}
case *sdl.MouseWheelEvent:
data.zoom += dt * float64(t.Y) * rotSpeed
}
}
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
renderTree(data, &data.nodes[0], point3d{0, 0, 0}, 100)
gl.Disable(gl.DEPTH_TEST)
drawAxis(data)
gl.Enable(gl.DEPTH_TEST)
sdl.GL_SwapWindow(window)
if glErr := gl.GetError(); glErr != gl.NO_ERROR {
panic(fmt.Errorf("GL error: %x", glErr))
}
}
}
// SwapBuffers swaps the current frame buffer in the window. This is generally
// only used by the engine but you could use it to roll your own game loop.
func SwapBuffers() {
sdl.GL_SwapWindow(getCurrent().sdl_window)
}
func (w Window) Refresh() {
sdl.Delay(1)
sdl.GL_SwapWindow(w.windowSDL)
}
func main() {
var window *sdl.Window
var context sdl.GLContext
var event sdl.Event
var running bool
var err error
runtime.LockOSThread()
if err = sdl.Init(sdl.INIT_EVERYTHING); err != nil {
panic(err)
}
defer sdl.Quit()
window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED,
sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_OPENGL)
if err != nil {
panic(err)
}
defer window.Destroy()
context, err = sdl.GL_CreateContext(window)
if err != nil {
panic(err)
}
defer sdl.GL_DeleteContext(context)
gl.Init()
gl.Viewport(0, 0, gl.Sizei(winWidth), gl.Sizei(winHeight))
// OPENGL FLAGS
gl.ClearColor(0.0, 0.1, 0.0, 1.0)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
// VERTEX BUFFER
var vertexbuffer gl.Uint
gl.GenBuffers(1, &vertexbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_vertices)*4), gl.Pointer(&triangle_vertices[0]), gl.STATIC_DRAW)
// COLOUR BUFFER
var colourbuffer gl.Uint
gl.GenBuffers(1, &colourbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_colours)*4), gl.Pointer(&triangle_colours[0]), gl.STATIC_DRAW)
// GUESS WHAT
program := createprogram()
// VERTEX ARRAY
var VertexArrayID gl.Uint
gl.GenVertexArrays(1, &VertexArrayID)
gl.BindVertexArray(VertexArrayID)
gl.EnableVertexAttribArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, nil)
// VERTEX ARRAY HOOK COLOURS
gl.EnableVertexAttribArray(1)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 0, nil)
//UNIFORM HOOK
unistring := gl.GLString("scaleMove")
UniScale = gl.GetUniformLocation(program, unistring)
fmt.Printf("Uniform Link: %v\n", UniScale+1)
gl.UseProgram(program)
running = true
for running {
for event = sdl.PollEvent(); event != nil; event =
sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
xrot = float32(t.Y) / 2
yrot = float32(t.X) / 2
fmt.Printf("[%dms]MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
}
}
drawgl()
sdl.GL_SwapWindow(window)
}
}
// Swaps the OpenGL window.
// Call this after everything has been rendered.
func (w *Window) Swap() {
sdl.GL_SwapWindow(w.Window)
}
func StartGame() {
window := initSDL()
context := initGL(window)
nvg := initNanovg()
ww, wh := window.GetSize()
gw := ww / 5
gh := wh / 5
life := NewLife(gw, gh)
refgrid := make([][]bool, gh)
for i := range refgrid {
refgrid[i] = make([]bool, gw)
}
// Run the game at 15fps. This gives us about 66ms to calculate
// and render everything. 30ms is not possible yet.
minms := uint32(1000 / 15)
running := true
gl.ClearColor(0.3, 0.3, 0.32, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT)
// Draw all squares first.
tw, th := float32(life.w), float32(life.h)
for y := float32(0); y < th; y++ {
for x := float32(0); x < tw; x++ {
nvg.BeginPath()
nvg.Rect(x*5+1, y*5+1, 3, 3)
nvg.FillColor(nanovg.RGBA(100, 100, 100, 255))
nvg.Fill()
nvg.ClosePath()
}
}
// Loop!
for running {
lt := sdl.GetTicks()
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.KeyUpEvent:
if t.Keysym.Sym == sdl.K_ESCAPE {
running = false
}
}
}
life.Step()
ww, wh := window.GetSize()
gl.Viewport(0, 0, ww, wh)
nvg.BeginFrame(ww, wh, 1.0)
drawGrid(life, nvg, refgrid)
nvg.EndFrame()
if d := sdl.GetTicks() - lt; d < minms {
sdl.Delay(minms - d)
}
sdl.GL_SwapWindow(window)
}
// Cleanup.
window.Destroy()
sdl.GL_DeleteContext(context)
nvg.Close()
sdl.Quit()
}
func windowLoop(window *sdl.Window, cameraMatrixUniform int32) {
var (
yrot float32
xrot float32
buttonDown bool
)
numFrame := 0
count := 0
t := time.Now()
for {
c := time.Now()
dt := c.Sub(t)
t = c
if numFrame > count {
fmt.Println("\rDeltaTime:", dt)
count += 5
}
numFrame++
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
return
case *sdl.KeyDownEvent:
if t.Keysym.Sym == sdl.K_ESCAPE {
return
}
case *sdl.MouseButtonEvent:
if t.State == 1 {
buttonDown = true
} else {
buttonDown = false
}
case *sdl.MouseMotionEvent:
if buttonDown {
xrot += float32(t.YRel) * 0.001
yrot += float32(t.XRel) * 0.001
}
}
}
gl.Clear(gl.COLOR_BUFFER_BIT)
xq := mgl32.QuatRotate(xrot, mgl32.Vec3{1, 0, 0})
yq := mgl32.QuatRotate(yrot, mgl32.Vec3{0, 1, 0})
mat := xq.Mul(yq).Mat4()
//mat = mat.Mul4(mgl32.Translate3D(0,0,-0.5))
gl.UniformMatrix4fv(cameraMatrixUniform, 1, false, &mat[0])
gl.DrawArrays(gl.TRIANGLES, 0, 6)
sdl.GL_SwapWindow(window)
if glErr := gl.GetError(); glErr != gl.NO_ERROR {
panic(fmt.Errorf("GL error, swap: %x", glErr))
}
}
}