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added an fps counter function

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This commit is contained in:
Thomas Friedel 2018-01-25 15:07:22 +01:00
parent 9d0dad8bba
commit 67142c3c8d
1 changed files with 21 additions and 1 deletions
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22
sdlcanvas/sdlcanvas.go
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@ -19,6 +19,7 @@ import (
type Window struct { type Window struct {
Window *sdl.Window Window *sdl.Window
GLContext sdl.GLContext GLContext sdl.GLContext
fps float32
} }
func CreateCanvasWindow(w, h int, title string) (*Window, *canvas.Canvas, error) { func CreateCanvasWindow(w, h int, title string) (*Window, *canvas.Canvas, error) {
@ -58,7 +59,7 @@ func CreateCanvasWindow(w, h int, title string) (*Window, *canvas.Canvas, error)
return nil, nil, fmt.Errorf("Error initializing GL: %v", err) return nil, nil, fmt.Errorf("Error initializing GL: %v", err)
} }
sdl.GL_SetSwapInterval(0) sdl.GL_SetSwapInterval(1)
gl.Enable(gl.MULTISAMPLE) gl.Enable(gl.MULTISAMPLE)
err = canvas.LoadGL(goglimpl.GLImpl{}) err = canvas.LoadGL(goglimpl.GLImpl{})
@ -80,7 +81,15 @@ func (wnd *Window) Destroy() {
wnd.Window.Destroy() wnd.Window.Destroy()
} }
func (wnd *Window) FPS() float32 {
return wnd.fps
}
func (wnd *Window) MainLoop(drawFunc func()) { func (wnd *Window) MainLoop(drawFunc func()) {
var frameTimes [10]time.Time
frameIndex := 0
frameCount := 0
// main loop // main loop
for running := true; running; { for running := true; running; {
for { for {
@ -109,6 +118,17 @@ func (wnd *Window) MainLoop(drawFunc func()) {
drawFunc() drawFunc()
now := time.Now()
frameTimes[frameIndex] = now
frameIndex++
frameIndex %= len(frameTimes)
if frameCount < len(frameTimes) {
frameCount++
} else {
diff := now.Sub(frameTimes[frameIndex]).Seconds()
wnd.fps = float32(frameCount-1) / float32(diff)
}
sdl.GL_SwapWindow(wnd.Window) sdl.GL_SwapWindow(wnd.Window)
} }
} }