fix mouse wheel scroll, cleanup imgui

platform/imgui/context.go

@@ -152,16 +152,8 @@ func ProcessEvent(event sdl.Event) (bool, error) {
 	switch event.GetType() {
 	case sdl.MOUSEWHEEL:
 		wheelEvent := event.(*sdl.MouseWheelEvent)
-		if wheelEvent.X > 0 {
+		imguiState.imguiIo.MouseWheelH += C.float(wheelEvent.X)
-			imguiState.imguiIo.MouseDelta.x++
+		imguiState.imguiIo.MouseWheel += C.float(wheelEvent.Y)
-		} else if wheelEvent.X < 0 {
-			imguiState.imguiIo.MouseDelta.x--
-		}
-		if wheelEvent.Y > 0 {
-			imguiState.imguiIo.MouseDelta.y++
-		} else if wheelEvent.Y < 0 {
-			imguiState.imguiIo.MouseDelta.y--
-		}
 		return true, nil
 	case sdl.MOUSEBUTTONDOWN:
 		buttonEvent := event.(*sdl.MouseButtonEvent)

platform/imgui/imgui.go

@@ -10,22 +10,22 @@ import (
 	"github.com/FooSoft/lazarus/math"
 )
 
-func DialogBegin(label string) bool {
+func Begin(label string) bool {
 	labelC := C.CString(label)
 	defer C.free(unsafe.Pointer(labelC))
 	return bool(C.igBegin(labelC, nil, 0))
 }
 
-func DialogEnd() {
-	C.igEnd()
-}
-
 func Button(label string) bool {
 	labelC := C.CString(label)
 	defer C.free(unsafe.Pointer(labelC))
 	return bool(C.igButton(labelC, C.ImVec2{}))
 }
 
+func End() {
+	C.igEnd()
+}
+
 func Image(texture graphics.Texture) {
 	ImageSized(texture, texture.Size())
 }
@@ -41,6 +41,10 @@ func ImageSized(texture graphics.Texture, size math.Vec2i) {
 	)
 }
 
+func SameLine() {
+	C.igSameLine(0, -1)
+}
+
 func SliderInt(label string, value *int, min, max int) bool {
 	labelC := C.CString(label)
 	defer C.free(unsafe.Pointer(labelC))

tools/viewer/viewer.go

@@ -66,7 +66,7 @@ func (s *scene) Advance() error {
 		}
 	}
 
-	imgui.DialogBegin("DC6 Viewer")
+	imgui.Begin("DC6 Viewer")
 	imgui.Image(s.texture)
 	direction := s.animation.Directions[directionIndex]
 	if imgui.SliderInt("Direction", &directionIndex, 0, len(s.animation.Directions)-1) {
@@ -79,7 +79,7 @@ func (s *scene) Advance() error {
 	if imgui.Button("Exit") {
 		platform.WindowSetScene(nil)
 	}
-	imgui.DialogEnd()
+	imgui.End()
 
 	if directionIndex != s.directionIndex || frameIndex != s.frameIndex {
 		s.directionIndex = directionIndex