// DrawArrays implements the opengl.OpenGl interface.
func (native *OpenGl) DrawArrays(mode uint32, first int32, count int32) {
gl.DrawArrays(mode, first, count)
}
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))
}
}
}