mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
143 lines
2.7 KiB
Go
143 lines
2.7 KiB
Go
package main
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// #cgo LDFLAGS: -framework GLUT -framework OpenGL
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//
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// #include <stdlib.h>
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// #include <GLUT/glut.h>
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//
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// void display(void);
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// void idle(void);
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//
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// static void setGlutFuncs(void) {
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// glutDisplayFunc(display);
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// glutIdleFunc(idle);
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// }
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//
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import "C"
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import (
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"github.com/hajimehoshi/go.ebiten"
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"github.com/hajimehoshi/go.ebiten/graphics"
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"github.com/hajimehoshi/go.ebiten/graphics/matrix"
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"image"
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"image/color"
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_ "image/png"
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"os"
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"runtime"
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"unsafe"
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)
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type GlutUI struct {
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screenWidth int
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screenHeight int
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screenScale int
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device graphics.Device
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}
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var currentUI *GlutUI
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//export display
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func display() {
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currentUI.device.Update()
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C.glutSwapBuffers()
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}
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//export idle
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func idle() {
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C.glutPostRedisplay()
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}
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func (ui *GlutUI) Init() {
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cargs := []*C.char{}
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for _, arg := range os.Args {
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cargs = append(cargs, C.CString(arg))
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}
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defer func() {
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for _, carg := range cargs {
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C.free(unsafe.Pointer(carg))
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}
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}()
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cargc := C.int(len(cargs))
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ui.screenWidth = 256
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ui.screenHeight = 240
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ui.screenScale = 2
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C.glutInit(&cargc, &cargs[0])
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C.glutInitDisplayMode(C.GLUT_RGBA)
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C.glutInitWindowSize(
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C.int(ui.screenWidth*ui.screenScale),
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C.int(ui.screenHeight*ui.screenScale))
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title := C.CString("Ebiten Demo")
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defer C.free(unsafe.Pointer(title))
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C.glutCreateWindow(title)
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C.setGlutFuncs()
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}
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func (ui *GlutUI) ScreenWidth() int {
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return ui.screenWidth
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}
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func (ui *GlutUI) ScreenHeight() int {
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return ui.screenHeight
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}
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func (ui *GlutUI) ScreenScale() int {
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return ui.screenScale
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}
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func (ui *GlutUI) Run(device graphics.Device) {
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ui.device = device
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C.glutMainLoop()
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}
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type DemoGame struct {
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ebitenTexture graphics.Texture
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x int
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}
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func (game *DemoGame) Init(tf graphics.TextureFactory) {
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file, err := os.Open("ebiten.png")
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if err != nil {
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panic(err)
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}
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defer file.Close()
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img, _, err := image.Decode(file)
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if err != nil {
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panic(err)
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}
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game.ebitenTexture = tf.NewTextureFromImage(img)
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}
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func (game *DemoGame) Update() {
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game.x++
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}
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func (game *DemoGame) Draw(g graphics.GraphicsContext, offscreen graphics.Texture) {
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g.Fill(&color.RGBA{R: 128, G: 128, B: 255, A: 255})
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geometryMatrix := matrix.IdentityGeometry()
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tx, ty := float64(game.ebitenTexture.Width), float64(game.ebitenTexture.Height)
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geometryMatrix.Translate(-tx/2, -ty/2)
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geometryMatrix.Rotate(float64(game.x) / 60)
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geometryMatrix.Translate(tx/2, ty/2)
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geometryMatrix.Translate(100, 100)
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g.DrawTexture(game.ebitenTexture.ID,
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0, 0, int(tx), int(ty),
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geometryMatrix,
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matrix.IdentityColor())
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}
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func main() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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game := &DemoGame{}
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currentUI = &GlutUI{}
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currentUI.Init()
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ebiten.OpenGLRun(game, currentUI)
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}
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