425 lines
9.6 KiB
Go
425 lines
9.6 KiB
Go
package pixel
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import (
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"image/color"
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"sync"
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"runtime"
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"github.com/faiface/pixel/pixelgl"
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"github.com/go-gl/gl/v3.3-core/gl"
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"github.com/go-gl/glfw/v3.2/glfw"
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"github.com/go-gl/mathgl/mgl32"
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"github.com/pkg/errors"
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)
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// WindowConfig is convenience structure for specifying all possible properties of a window.
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// Properties are chosen in such a way, that you usually only need to set a few of them - defaults
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// (zeros) should usually be sensible.
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//
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// Note that you always need to set the width and the height of a window.
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type WindowConfig struct {
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// Title at the top of a window.
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Title string
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// Width of a window in pixels.
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Width float64
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// Height of a window in pixels.
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Height float64
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// If set to nil, a window will be windowed. Otherwise it will be fullscreen on the specified monitor.
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Fullscreen *Monitor
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// Whether a window is resizable.
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Resizable bool
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// If set to true, the window will be initially invisible.
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Hidden bool
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// Undecorated window ommits the borders and decorations (close button, etc.).
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Undecorated bool
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// If set to true, a window will not get focused upon showing up.
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Unfocused bool
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// Whether a window is maximized.
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Maximized bool
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// VSync (vertical synchronization) synchronizes window's framerate with the framerate of the monitor.
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VSync bool
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// Number of samples for multi-sample anti-aliasing (edge-smoothing).
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// Usual values are 0, 2, 4, 8 (powers of 2 and not much more than this).
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MSAASamples int
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}
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// Window is a window handler. Use this type to manipulate a window (input, drawing, ...).
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type Window struct {
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enabled bool
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window *glfw.Window
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config WindowConfig
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defaultShader *pixelgl.Shader
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// need to save these to correctly restore a fullscreen window
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restore struct {
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xpos, ypos, width, height int
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}
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prevInp, tempInp, currInp struct {
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buttons [KeyLast + 1]bool
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scroll Vec
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}
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}
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// NewWindow creates a new window with it's properties specified in the provided config.
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//
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// If window creation fails, an error is returned.
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func NewWindow(config WindowConfig) (*Window, error) {
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bool2int := map[bool]int{
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true: glfw.True,
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false: glfw.False,
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}
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w := &Window{config: config}
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err := pixelgl.DoErr(func() error {
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err := glfw.Init()
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if err != nil {
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return err
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}
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glfw.WindowHint(glfw.ContextVersionMajor, 3)
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glfw.WindowHint(glfw.ContextVersionMinor, 3)
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glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
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glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
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glfw.WindowHint(glfw.Resizable, bool2int[config.Resizable])
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glfw.WindowHint(glfw.Visible, bool2int[!config.Hidden])
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glfw.WindowHint(glfw.Decorated, bool2int[!config.Undecorated])
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glfw.WindowHint(glfw.Focused, bool2int[!config.Unfocused])
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glfw.WindowHint(glfw.Maximized, bool2int[config.Maximized])
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glfw.WindowHint(glfw.Samples, config.MSAASamples)
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w.window, err = glfw.CreateWindow(int(config.Width), int(config.Height), config.Title, nil, nil)
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if err != nil {
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return err
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}
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return nil
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})
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if err != nil {
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return nil, errors.Wrap(err, "creating window failed")
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}
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w.initInput()
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w.SetFullscreen(config.Fullscreen)
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w.Do(func(pixelgl.Context) {
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w.defaultShader, err = pixelgl.NewShader(
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pixelgl.NoOpDoer,
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defaultVertexFormat,
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defaultUniformFormat,
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defaultVertexShader,
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defaultFragmentShader,
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)
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// default uniforms
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w.defaultShader.SetUniformAttr(maskColorVec4, mgl32.Vec4{1, 1, 1, 1})
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w.defaultShader.SetUniformAttr(transformMat3, mgl32.Ident3())
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})
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if err != nil {
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w.Destroy()
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return nil, errors.Wrap(err, "creating window failed")
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}
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runtime.SetFinalizer(w, (*Window).Destroy)
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return w, nil
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}
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// Destroy destroys a window. The window can't be used any further.
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func (w *Window) Destroy() {
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pixelgl.Do(func() {
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w.window.Destroy()
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})
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}
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// Clear clears the window with a color.
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func (w *Window) Clear(c color.Color) {
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w.Do(func(pixelgl.Context) {
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pixelgl.DoNoBlock(func() {
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gl.ClearColor(colorToRGBA(c))
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gl.Clear(gl.COLOR_BUFFER_BIT)
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})
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})
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}
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// Update swaps buffers and polls events.
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func (w *Window) Update() {
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w.Do(func(pixelgl.Context) {
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pixelgl.Do(func() {
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if w.config.VSync {
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glfw.SwapInterval(1)
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}
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w.window.SwapBuffers()
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})
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w.updateInput()
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pixelgl.Do(func() {
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w, h := w.window.GetSize()
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gl.Viewport(0, 0, int32(w), int32(h))
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})
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})
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}
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// DefaultShader returns the default shader used by a window.
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func (w *Window) DefaultShader() *pixelgl.Shader {
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return w.defaultShader
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}
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// SetClosed sets the closed flag of a window.
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//
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// This is usefull when overriding the user's attempt to close a window, or just to close a window
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// from within a program.
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func (w *Window) SetClosed(closed bool) {
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pixelgl.Do(func() {
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w.window.SetShouldClose(closed)
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})
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}
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// Closed returns the closed flag of a window, which reports whether the window should be closed.
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//
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// The closed flag is automatically set when a user attempts to close a window.
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func (w *Window) Closed() bool {
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return pixelgl.DoVal(func() interface{} {
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return w.window.ShouldClose()
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}).(bool)
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}
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// SetTitle changes the title of a window.
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func (w *Window) SetTitle(title string) {
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pixelgl.Do(func() {
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w.window.SetTitle(title)
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})
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}
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// SetSize resizes a window to the specified size in pixels.
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// In case of a fullscreen window, it changes the resolution of that window.
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func (w *Window) SetSize(width, height float64) {
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pixelgl.Do(func() {
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w.window.SetSize(int(width), int(height))
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})
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}
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// Size returns the size of the client area of a window (the part you can draw on).
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func (w *Window) Size() (width, height float64) {
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pixelgl.Do(func() {
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wi, hi := w.window.GetSize()
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width = float64(wi)
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height = float64(hi)
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})
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return width, height
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}
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// Show makes a window visible if it was hidden.
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func (w *Window) Show() {
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pixelgl.Do(func() {
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w.window.Show()
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})
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}
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// Hide hides a window if it was visible.
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func (w *Window) Hide() {
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pixelgl.Do(func() {
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w.window.Hide()
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})
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}
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// SetFullscreen sets a window fullscreen on a given monitor. If the monitor is nil, the window will be resored to windowed instead.
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//
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// Note, that there is nothing about the resolution of the fullscreen window. The window is automatically set to the monitor's
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// resolution. If you want a different resolution, you need to set it manually with SetSize method.
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func (w *Window) SetFullscreen(monitor *Monitor) {
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if w.Monitor() != monitor {
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if monitor == nil {
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pixelgl.Do(func() {
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w.window.SetMonitor(
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nil,
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w.restore.xpos,
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w.restore.ypos,
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w.restore.width,
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w.restore.height,
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0,
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)
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})
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} else {
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pixelgl.Do(func() {
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w.restore.xpos, w.restore.ypos = w.window.GetPos()
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w.restore.width, w.restore.height = w.window.GetSize()
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width, height := monitor.Size()
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refreshRate := monitor.RefreshRate()
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w.window.SetMonitor(
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monitor.monitor,
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0,
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0,
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int(width),
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int(height),
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int(refreshRate),
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)
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})
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}
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}
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}
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// IsFullscreen returns true if the window is in the fullscreen mode.
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func (w *Window) IsFullscreen() bool {
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return w.Monitor() != nil
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}
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// Monitor returns a monitor a fullscreen window is on. If the window is not fullscreen, this function returns nil.
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func (w *Window) Monitor() *Monitor {
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monitor := pixelgl.DoVal(func() interface{} {
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return w.window.GetMonitor()
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}).(*glfw.Monitor)
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if monitor == nil {
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return nil
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}
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return &Monitor{
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monitor: monitor,
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}
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}
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// Focus brings a window to the front and sets input focus.
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func (w *Window) Focus() {
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pixelgl.Do(func() {
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w.window.Focus()
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})
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}
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// Focused returns true if a window has input focus.
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func (w *Window) Focused() bool {
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return pixelgl.DoVal(func() interface{} {
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return w.window.GetAttrib(glfw.Focused) == glfw.True
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}).(bool)
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}
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// Maximize puts a windowed window to a maximized state.
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func (w *Window) Maximize() {
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pixelgl.Do(func() {
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w.window.Maximize()
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})
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}
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// Restore restores a windowed window from a maximized state.
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func (w *Window) Restore() {
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pixelgl.Do(func() {
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w.window.Restore()
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})
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}
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var currentWindow struct {
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sync.Mutex
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handler *Window
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}
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// Do makes the context of this window current, if it's not already, and executes sub.
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func (w *Window) Do(sub func(pixelgl.Context)) {
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if !w.enabled {
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currentWindow.Lock()
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defer currentWindow.Unlock()
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if currentWindow.handler != w {
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pixelgl.Do(func() {
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w.window.MakeContextCurrent()
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pixelgl.Init()
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})
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currentWindow.handler = w
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}
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}
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w.enabled = true
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if w.defaultShader != nil {
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w.defaultShader.Do(sub)
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} else {
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sub(pixelgl.Context{})
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}
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w.enabled = false
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}
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var defaultVertexFormat = pixelgl.AttrFormat{
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"position": pixelgl.Vec2,
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"color": pixelgl.Vec4,
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"texCoord": pixelgl.Vec2,
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}
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var defaultUniformFormat = pixelgl.AttrFormat{
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"maskColor": pixelgl.Vec4,
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"transform": pixelgl.Mat3,
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}
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var defaultVertexShader = `
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#version 330 core
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in vec2 position;
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in vec4 color;
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in vec2 texCoord;
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out vec4 Color;
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out vec2 TexCoord;
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uniform mat3 transform;
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void main() {
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gl_Position = vec4((transform * vec3(position.x, position.y, 1.0)).xy, 0.0, 1.0);
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Color = color;
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TexCoord = texCoord;
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}
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`
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var defaultFragmentShader = `
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#version 330 core
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in vec4 Color;
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in vec2 TexCoord;
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out vec4 color;
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uniform vec4 maskColor;
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uniform sampler2D tex;
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void main() {
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if (TexCoord == vec2(-1, -1)) {
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color = maskColor * Color;
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} else {
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color = maskColor * Color * texture(tex, vec2(TexCoord.x, 1 - TexCoord.y));
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}
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}
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`
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var (
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positionVec2 = pixelgl.Attr{
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Name: "position",
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Type: pixelgl.Vec2,
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}
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colorVec4 = pixelgl.Attr{
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Name: "color",
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Type: pixelgl.Vec4,
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}
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texCoordVec2 = pixelgl.Attr{
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Name: "texCoord",
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Type: pixelgl.Vec2,
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}
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maskColorVec4 = pixelgl.Attr{
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Name: "maskColor",
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Type: pixelgl.Vec4,
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}
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transformMat3 = pixelgl.Attr{
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Name: "transform",
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Type: pixelgl.Mat3,
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}
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)
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