func main() {
var err error
if err = glfw.Init(); err != nil {
log.Fatalf("%v\n", err)
return
}
defer glfw.Terminate()
// Open window with FSAA samples (if possible).
glfw.OpenWindowHint(glfw.FsaaSamples, 4)
if err = glfw.OpenWindow(400, 400, 0, 0, 0, 0, 0, 0, glfw.Windowed); err != nil {
log.Fatalf("%v\n", err)
return
}
defer glfw.CloseWindow()
glfw.SetWindowTitle("Aliasing Detector")
glfw.SetSwapInterval(1)
if samples := glfw.WindowParam(glfw.FsaaSamples); samples != 0 {
fmt.Printf("Context reports FSAA is supported with %d samples\n", samples)
} else {
fmt.Printf("Context reports FSAA is unsupported\n")
}
gl.MatrixMode(gl.PROJECTION)
glu.Perspective(0, 1, 0, 1)
for glfw.WindowParam(glfw.Opened) == 1 {
time := float32(glfw.Time())
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.LoadIdentity()
gl.Translatef(0.5, 0, 0)
gl.Rotatef(time, 0, 0, 1)
gl.Enable(GL_MULTISAMPLE_ARB)
gl.Color3f(1, 1, 1)
gl.Rectf(-0.25, -0.25, 0.25, 0.25)
gl.LoadIdentity()
gl.Translatef(-0.5, 0, 0)
gl.Rotatef(time, 0, 0, 1)
gl.Disable(GL_MULTISAMPLE_ARB)
gl.Color3f(1, 1, 1)
gl.Rectf(-0.25, -0.25, 0.25, 0.25)
glfw.SwapBuffers()
}
}
// drawString draws the same string for each loaded font.
func drawString(x, y float32, str string) error {
for i := range fonts {
if fonts[i] == nil {
continue
}
// We need to offset each string by the height of the
// font. To ensure they don't overlap each other.
_, h := fonts[i].GlyphBounds()
y := y + float32(i*h)
// Draw a rectangular backdrop using the string's metrics.
sw, sh := fonts[i].Metrics(SampleString)
gl.Color4f(0.1, 0.1, 0.1, 0.7)
gl.Rectf(x, y, x+float32(sw), y+float32(sh))
// Render the string.
gl.Color4f(1, 1, 1, 1)
err := fonts[i].Printf(x, y, str)
if err != nil {
return err
}
}
return nil
}
func (v *video) draw(pixels []byte) {
// No need to clear the screen since I explicitly redraw all pixels, at
// least currently.
gl.MatrixMode(gl.POLYGON)
for yline := 0; yline < screenHeight; yline++ {
for xline := 0; xline < screenWidth; xline++ {
x, y := float32(xline), float32(yline)
if pixels[xline+yline*64] == 0 {
gl.Color3f(0, 0, 0)
} else {
gl.Color3f(1, 1, 1)
}
gl.Rectf(x, y, x+1, y+1)
}
}
glfw.SwapBuffers()
}