[WIP] Viewports backend, 2

imgui-lwjgl3/src/main/java/imgui/glfw/ImGuiImplGlfw.java

@@ -26,6 +26,7 @@ import org.lwjgl.glfw.GLFWErrorCallback;
 import org.lwjgl.glfw.GLFWKeyCallback;
 import org.lwjgl.glfw.GLFWMonitorCallback;
 import org.lwjgl.glfw.GLFWMouseButtonCallback;
+import org.lwjgl.glfw.GLFWNativeWin32;
 import org.lwjgl.glfw.GLFWScrollCallback;
 import org.lwjgl.glfw.GLFWVidMode;
 
@@ -43,6 +44,8 @@ import static org.lwjgl.system.MemoryUtil.NULL;
  * modify the rendering routine in the way you'd like.
  */
 public class ImGuiImplGlfw {
+    protected static final boolean IS_WINDOWS = System.getProperty("os.name", "generic").toLowerCase().contains("win");
+
     // Pointer of the current GLFW window
     private long windowPtr;
 
@@ -239,6 +242,10 @@ public class ImGuiImplGlfw {
         final ImGuiViewport mainViewport = ImGui.getMainViewport();
         mainViewport.setPlatformHandle(windowPtr);
 
+        if (IS_WINDOWS) {
+            mainViewport.setPlatformHandleRaw(GLFWNativeWin32.glfwGetWin32Window(windowId));
+        }
+
         if ((io.getConfigFlags() & ImGuiConfigFlags.ViewportsEnable) != 0) {
             initPlatformInterface();
         }
@@ -528,6 +535,10 @@ public class ImGuiImplGlfw {
 
             vp.setPlatformHandle(data.window);
 
+            if (IS_WINDOWS) {
+                vp.setPlatformHandleRaw(GLFWNativeWin32.glfwGetWin32Window(data.window));
+            }
+
             glfwSetWindowPos(data.window, (int) vp.getPosX(), (int) vp.getPosY());
 
             // Install GLFW callbacks for secondary viewports
@@ -562,6 +573,11 @@ public class ImGuiImplGlfw {
         @Override
         public void accept(final ImGuiViewport vp) {
             final ImGuiViewportDataGlfw data = (ImGuiViewportDataGlfw) vp.getPlatformUserData();
+
+            if (IS_WINDOWS && (vp.getFlags() & ImGuiViewportFlags.NoTaskBarIcon) != 0) {
+                ImGuiImplGlfwNative.win32hideFromTaskBar(vp.getPlatformHandleRaw());
+            }
+
             glfwShowWindow(data.window);
         }
     }
@@ -606,7 +622,7 @@ public class ImGuiImplGlfw {
         public void accept(final ImGuiViewport vp, final ImVec2 imVec2) {
             final ImGuiViewportDataGlfw data = (ImGuiViewportDataGlfw) vp.getPlatformUserData();
             data.ignoreWindowSizeEventFrame = ImGui.getFrameCount();
-            glfwSetWindowSize(data.window, (int) imVec2.y, (int) imVec2.y);
+            glfwSetWindowSize(data.window, (int) imVec2.x, (int) imVec2.y);
         }
     }
 

imgui-lwjgl3/src/test/java/ExampleUi.java

@@ -1,3 +1,4 @@
+import imgui.ImGuiViewport;
 import imgui.type.ImBoolean;
 import imgui.ImColor;
 import imgui.ImGui;
@@ -40,8 +41,10 @@ final class ExampleUi {
     }
 
     void render() {
+        final ImGuiViewport mainViewport = ImGui.getMainViewport();
+
         ImGui.setNextWindowSize(600, 300, ImGuiCond.Once);
-        ImGui.setNextWindowPos(10, 10, ImGuiCond.Once);
+        ImGui.setNextWindowPos(mainViewport.getWorkPosX() + 10, mainViewport.getWorkPosY() + 10, ImGuiCond.Once);
 
         ImGui.begin("Custom window");  // Start Custom window
 

imgui-lwjgl3/src/test/java/ImGuiGlfwExample.java

@@ -12,6 +12,8 @@ import imgui.ImFontConfig;
 import imgui.ImGui;
 import imgui.ImGuiFreeType;
 import imgui.ImGuiIO;
+import imgui.ImGuiStyle;
+import imgui.flag.ImGuiCol;
 import imgui.flag.ImGuiConfigFlags;
 import imgui.gl3.ImGuiImplGl3;
 import imgui.glfw.ImGuiImplGlfw;
@@ -143,7 +145,6 @@ public final class ImGuiGlfwExample {
         // Initialize ImGuiIO config
         final ImGuiIO io = ImGui.getIO();
 
-        io.setMouseDrawCursor(true);
         io.setIniFilename(null); // We don't want to save .ini file
         io.addConfigFlags(ImGuiConfigFlags.NavEnableKeyboard | ImGuiConfigFlags.DockingEnable | ImGuiConfigFlags.ViewportsEnable);
 
@@ -185,6 +186,13 @@ public final class ImGuiGlfwExample {
         // ------------------------------------------------------------
         // Use freetype instead of stb_truetype to build a fonts texture
         ImGuiFreeType.buildFontAtlas(fontAtlas, ImGuiFreeType.RasterizerFlags.LightHinting);
+
+        // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
+        if ((io.getConfigFlags() & ImGuiConfigFlags.ViewportsEnable) != 0) {
+            final ImGuiStyle style = ImGui.getStyle();
+            style.setWindowRounding(0.0f);
+            style.setColor(ImGuiCol.WindowBg, ImGui.getColorU32(ImGuiCol.WindowBg, 1));
+        }
     }
 
     // Main application loop