add imgui sample, cleanup imgui
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24ba631864
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1914d490fe
@ -51,8 +51,8 @@ var keyMapping = map[int]C.int{
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}
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var imguiState struct {
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imguiContext *C.ImGuiContext
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imguiIo *C.ImGuiIO
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context *C.ImGuiContext
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io *C.ImGuiIO
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fontTexture uint32
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displaySize math.Vec2i
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@ -67,16 +67,17 @@ func Create() error {
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}
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log.Println("imgui create")
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imguiState.imguiContext = C.igCreateContext(nil)
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imguiState.imguiIo = C.igGetIO()
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imguiState.context = C.igCreateContext(nil)
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imguiState.io = C.igGetIO()
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imguiState.io.IniFilename = nil
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for imguiKey, nativeKey := range keyMapping {
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imguiState.imguiIo.KeyMap[imguiKey] = nativeKey
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imguiState.io.KeyMap[imguiKey] = nativeKey
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}
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var imageData *C.uchar
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var imageWidth, imageHeight C.int
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C.ImFontAtlas_GetTexDataAsRGBA32(imguiState.imguiIo.Fonts, &imageData, &imageWidth, &imageHeight, nil)
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C.ImFontAtlas_GetTexDataAsRGBA32(imguiState.io.Fonts, &imageData, &imageWidth, &imageHeight, nil)
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var lastTexture int32
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gl.GetIntegerv(gl.TEXTURE_BINDING_2D, &lastTexture)
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@ -92,7 +93,7 @@ func Create() error {
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}
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func IsCreated() bool {
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return imguiState.imguiContext != nil
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return imguiState.context != nil
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}
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func Destroy() error {
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@ -100,14 +101,15 @@ func Destroy() error {
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return nil
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}
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log.Println("imgui destroy")
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gl.DeleteTextures(1, &imguiState.fontTexture)
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imguiState.imguiIo.Fonts.TexID = C.nativeHandleCast(C.uintptr_t(imguiState.fontTexture))
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imguiState.io.Fonts.TexID = C.nativeHandleCast(C.uintptr_t(imguiState.fontTexture))
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imguiState.fontTexture = 0
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log.Println("imgui destroy")
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C.igDestroyContext(imguiState.imguiContext)
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imguiState.imguiContext = nil
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imguiState.imguiIo = nil
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C.igDestroyContext(imguiState.context)
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imguiState.context = nil
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imguiState.io = nil
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return nil
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}
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@ -120,23 +122,23 @@ func BeginFrame(displaySize, bufferSize math.Vec2i) error {
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imguiState.displaySize = displaySize
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imguiState.bufferSize = bufferSize
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imguiState.imguiIo.Fonts.TexID = C.nativeHandleCast(C.uintptr_t(imguiState.fontTexture))
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imguiState.imguiIo.DisplaySize.x = C.float(displaySize.X)
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imguiState.imguiIo.DisplaySize.y = C.float(displaySize.Y)
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imguiState.io.Fonts.TexID = C.nativeHandleCast(C.uintptr_t(imguiState.fontTexture))
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imguiState.io.DisplaySize.x = C.float(displaySize.X)
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imguiState.io.DisplaySize.y = C.float(displaySize.Y)
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currentTime := sdl.GetPerformanceCounter()
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if imguiState.lastTime > 0 {
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imguiState.imguiIo.DeltaTime = C.float(float32(currentTime-imguiState.lastTime) / float32(sdl.GetPerformanceFrequency()))
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imguiState.io.DeltaTime = C.float(float32(currentTime-imguiState.lastTime) / float32(sdl.GetPerformanceFrequency()))
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} else {
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imguiState.imguiIo.DeltaTime = C.float(1.0 / 60.0)
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imguiState.io.DeltaTime = C.float(1.0 / 60.0)
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}
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imguiState.lastTime = currentTime
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x, y, state := sdl.GetMouseState()
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imguiState.imguiIo.MousePos.x = C.float(x)
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imguiState.imguiIo.MousePos.y = C.float(y)
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imguiState.io.MousePos.x = C.float(x)
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imguiState.io.MousePos.y = C.float(y)
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for i, button := range []uint32{sdl.BUTTON_LEFT, sdl.BUTTON_RIGHT, sdl.BUTTON_MIDDLE} {
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imguiState.imguiIo.MouseDown[i] = C.bool(imguiState.buttonsDown[i] || (state&sdl.Button(button)) != 0)
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imguiState.io.MouseDown[i] = C.bool(imguiState.buttonsDown[i] || (state&sdl.Button(button)) != 0)
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imguiState.buttonsDown[i] = false
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}
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@ -152,8 +154,8 @@ func ProcessEvent(event sdl.Event) (bool, error) {
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switch event.GetType() {
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case sdl.MOUSEWHEEL:
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wheelEvent := event.(*sdl.MouseWheelEvent)
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imguiState.imguiIo.MouseWheelH += C.float(wheelEvent.X)
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imguiState.imguiIo.MouseWheel += C.float(wheelEvent.Y)
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imguiState.io.MouseWheelH += C.float(wheelEvent.X)
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imguiState.io.MouseWheel += C.float(wheelEvent.Y)
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return true, nil
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case sdl.MOUSEBUTTONDOWN:
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buttonEvent := event.(*sdl.MouseButtonEvent)
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@ -171,22 +173,22 @@ func ProcessEvent(event sdl.Event) (bool, error) {
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return true, nil
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case sdl.TEXTINPUT:
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inputEvent := event.(*sdl.TextInputEvent)
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C.ImGuiIO_AddInputCharactersUTF8(imguiState.imguiIo, (*C.char)(unsafe.Pointer(&inputEvent.Text[0])))
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C.ImGuiIO_AddInputCharactersUTF8(imguiState.io, (*C.char)(unsafe.Pointer(&inputEvent.Text[0])))
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return true, nil
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case sdl.KEYDOWN:
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keyEvent := event.(*sdl.KeyboardEvent)
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imguiState.imguiIo.KeysDown[keyEvent.Keysym.Scancode] = true
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imguiState.io.KeysDown[keyEvent.Keysym.Scancode] = true
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modState := sdl.GetModState()
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imguiState.imguiIo.KeyCtrl = C.bool(modState&sdl.KMOD_CTRL != 0)
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imguiState.imguiIo.KeyAlt = C.bool(modState&sdl.KMOD_ALT != 0)
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imguiState.imguiIo.KeyShift = C.bool(modState&sdl.KMOD_SHIFT != 0)
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imguiState.io.KeyCtrl = C.bool(modState&sdl.KMOD_CTRL != 0)
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imguiState.io.KeyAlt = C.bool(modState&sdl.KMOD_ALT != 0)
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imguiState.io.KeyShift = C.bool(modState&sdl.KMOD_SHIFT != 0)
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case sdl.KEYUP:
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keyEvent := event.(*sdl.KeyboardEvent)
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imguiState.imguiIo.KeysDown[keyEvent.Keysym.Scancode] = false
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imguiState.io.KeysDown[keyEvent.Keysym.Scancode] = false
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modState := sdl.GetModState()
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imguiState.imguiIo.KeyCtrl = C.bool(modState&sdl.KMOD_CTRL != 0)
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imguiState.imguiIo.KeyAlt = C.bool(modState&sdl.KMOD_ALT != 0)
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imguiState.imguiIo.KeyShift = C.bool(modState&sdl.KMOD_SHIFT != 0)
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imguiState.io.KeyCtrl = C.bool(modState&sdl.KMOD_CTRL != 0)
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imguiState.io.KeyAlt = C.bool(modState&sdl.KMOD_ALT != 0)
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imguiState.io.KeyShift = C.bool(modState&sdl.KMOD_SHIFT != 0)
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return true, nil
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}
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@ -70,3 +70,7 @@ func Columns(count int) {
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func NextColumn() {
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C.igNextColumn()
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}
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func ShowDemoWindow() {
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C.igShowDemoWindow(nil)
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}
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49
samples/imgui/imgui.go
Normal file
49
samples/imgui/imgui.go
Normal file
@ -0,0 +1,49 @@
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package main
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import (
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"fmt"
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"os"
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"time"
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"github.com/FooSoft/lazarus/math"
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"github.com/FooSoft/lazarus/platform"
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"github.com/FooSoft/lazarus/platform/imgui"
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)
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type scene struct{}
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func (s *scene) Name() string {
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return "imgui"
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}
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func (s *scene) Advance() error {
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imgui.ShowDemoWindow()
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return nil
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}
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func main() {
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if err := platform.Initialize(); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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defer platform.Shutdown()
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if err := platform.WindowCreate("ImGui", math.Vec2i{X: 1024, Y: 768}, new(scene)); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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defer platform.WindowDestroy()
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for {
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run, err := platform.Advance()
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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if !run {
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break
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}
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<-time.After(time.Millisecond * 25)
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}
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}
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