started on IMGUI - looks very promising so far

asteroids/UserInterface.cc

@@ -16,6 +16,8 @@
 #include "Engine.h"
 #include "Game.h"
 
+#include "IMGUIControls.h"
+
 namespace asteroids {
 
 // static float left = 0;
@@ -68,15 +70,31 @@ void MainMenuOverlay::Draw () {
 	glPushMatrix ();
 	glLoadIdentity ();
 
+//	Engine::DrawGLString ( right * 0.5 - 100, 100, "A s t e r o i d s");
+
+	Engine::GUI::Label (4, "A s t e r o i d s", right * 0.5 - 100, 180);
+
+	if (Engine::GUI::Button (1, "Start Game", right * 0.5 - 100, 200, 250, 40)) {
+		GetModel()->SetGameState(GameStateEnterPlayername);
+	}
+
+	if (Engine::GUI::Button (2, "Highscores", right * 0.5 - 100, 250, 250, 40)) {
+		GetModel()->SetGameState(GameStateShowHighscore);
+	}
+
+	if (Engine::GUI::Button (3, "Quit", right * 0.5 - 100, 330, 250, 40)) {
+		Engine::RunCommand("quit");
+	}
+
 	GetView()->SelectFont("console.ttf");
 
+/*	
 	// then we do the drawings
-	Engine::DrawGLString ( right * 0.5 - 100, bottom * 0.5 - 8 - 64, "A s t e r o i d s");
 	Engine::DrawGLString ( right * 0.5 - 100, bottom * 0.5 - 8 - 32, "Main Menu");
 	Engine::DrawGLString ( right * 0.5 - 80, bottom * 0.5 - 8 - 16, "[Return] - Start Game");
 	Engine::DrawGLString ( right * 0.5 - 80, bottom * 0.5 - 8, "[h]      - Show Highscore");
 	Engine::DrawGLString ( right * 0.5 - 80, bottom * 0.5 + 8, "[Escape] - Quit");
-
+*/
 	glPopMatrix ();
 
 	glMatrixMode (GL_PROJECTION);
@@ -602,7 +620,9 @@ void EnterPlayernameOverlay::Draw () {
 	Engine::DrawGLString ( x, y, "Enter your name: ");
 
 	std::string name_output (mPlayerNameInput);
-	name_output += "_";
+	if (SDL_GetTicks() >> 9 & 1)
+		name_output += "_";
+
 	Engine::DrawGLString ( x + 15*8, y, name_output.c_str()); 
 	Engine::DrawGLString ( x + 16, y + 16, "Press [Return] to continue.");
 	

asteroids/UserInterface.h

@@ -7,6 +7,7 @@ class OverlayBase;
 
 #include "OverlayBase.h"
 #include "Sprite.h"
+#include "IMGUIControls.h"
 #include <string>
 
 namespace asteroids {

engine/CMakeLists.txt

@@ -32,6 +32,7 @@ SET ( ENGINE_SRCS
 	VariablesCommands.cc
 	SimpleConsoleOverlay.cc
 	Sprite.cc
+	IMGUIControls.cc
 
 	Engine.cc
 	Logging.cc

engine/ControllerBase.cc

@@ -49,8 +49,13 @@ int ControllerBase::OnInit (int argc, char* argv[]) {
 
 	// clear all bindings
 	int i;
-	for (i = 0; i < BINDING_KEYS_LAST; i++)
+	for (i = 0; i < BINDING_KEYS_LAST; i++) {
 		mBindings[i] = "";
+		mButtonStates.set(i, false);
+	}
+
+	uistate.activeitem = 0;
+	uistate.hotitem = 0;
 
 	ControllerInstance = this;
 
@@ -141,8 +146,19 @@ void ControllerBase::EnableTextinput (bool textinput_state) {
 	}
 }
 
+void ControllerBase::IMGUIFinish () {
+	if (GetButtonState(MouseButtonLeft) == false) {
+		uistate.activeitem = 0;
+	} else {
+		if (uistate.activeitem == 0)
+			uistate.activeitem = -1;
+	}
+}
+
 /** \brief Keyboard processing */
 bool ControllerBase::OnKeyDown (const SDL_keysym &keysym) {
+	mButtonStates.set(keysym.sym, true);
+
 	if (mView->mOverlayManager.SendKeyDown (keysym))
 		return true;
 
@@ -156,6 +172,8 @@ bool ControllerBase::OnKeyDown (const SDL_keysym &keysym) {
 
 /** \brief Keyboard processing */
 bool ControllerBase::OnKeyUp (const SDL_keysym &keysym) {
+	mButtonStates.set(keysym.sym, false);
+
 	if (mView->mOverlayManager.SendKeyUp (keysym))
 		return true;
 
@@ -174,6 +192,7 @@ bool ControllerBase::OnKeyUp (const SDL_keysym &keysym) {
 /** \brief Mouse processing */
 bool ControllerBase::OnMouseButtonDown (Uint8 button, Uint16 xpos, Uint16 ypos) {
 	MouseButton mouse_button = convert_sdl_button (button);
+	mButtonStates.set(mouse_button, true);
 
 	if (mView->mOverlayManager.SendMouseButtonDown (button, xpos, ypos))
 		return true;
@@ -189,6 +208,7 @@ bool ControllerBase::OnMouseButtonDown (Uint8 button, Uint16 xpos, Uint16 ypos)
 /** \brief Mouse processing */
 bool ControllerBase::OnMouseButtonUp (Uint8 button, Uint16 xpos, Uint16 ypos) {
 	MouseButton mouse_button = convert_sdl_button (button);
+	mButtonStates.set(mouse_button, false);
 
 	if (mView->mOverlayManager.SendMouseButtonUp (button, xpos, ypos))
 		return true;

engine/ControllerBase.h

@@ -9,6 +9,15 @@ class ModelBase;
 class Console;
 class Module;
 
+/** \brief The IMGUI state
+ *
+ * See also http://sol.gfxile.net/imgui/
+ */
+struct UIState {
+	int hotitem;
+	int activeitem;
+};
+
 /** \brief Defines the number of keys (keyboard + mous) that we can bind to.
  * 
  * As the keysym enum of SDL has about 320 keys defined and we might have some
@@ -42,11 +51,26 @@ class ControllerBase : public Module {
 			pos_out[1] = mMouseWorldPosition[1];
 			pos_out[2] = mMouseWorldPosition[2];
 		}
+		bool GetButtonState (unsigned int key) {
+			assert (key < BINDING_KEYS_LAST);
+			return mButtonStates.test(key);
+		}
+		void SetButtonState (unsigned int key, bool state) {
+			assert (key < BINDING_KEYS_LAST);
+			mButtonStates.set (key, state);
+		}
 		bool BindKey (int key, const char *command);
 
 		/** \brief Activates or deactivates unicode processing and key delays of the keyboard inputs */
 		void EnableTextinput (bool textinput_state);
 
+		void IMGUIPrepare () {
+			uistate.hotitem = 0;
+		}
+		void IMGUIFinish ();
+
+		UIState uistate;
+
 	protected:
 		/** \brief Initializes the system */
 		virtual int OnInit (int argc, char* argv[]);
@@ -82,8 +106,12 @@ class ControllerBase : public Module {
 
 		/** \brief Stores the current mouse position in screen coordinates */
 		int mMouseScreenPosition[2];
-		/** \brief Stores the current mouse position on the y=0 plane in wolrd * coordinates */
+		/** \brief Stores the current mouse position on the y=0 plane in world coordinates */
 		float mMouseWorldPosition[3];
+		
+		/** \brief Stores for each button of the mouse whether it is clicked
+		 * \TODO [low] move it to a bitset and remove the fixed amount of buttons */
+		std::bitset<BINDING_KEYS_LAST> mButtonStates;
 
 		/** \brief Contains all the bindings for the keyboard */
 		std::string mBindings[BINDING_KEYS_LAST];

engine/DrawingsGL.cc

@@ -245,3 +245,12 @@ void DrawVector(vector3d start, vector3d end) {
 		glEnd ();
 	}
 }
+
+void DrawRect2D (float x, float y, float w, float h) {
+	glBegin (GL_QUADS);
+	glVertex3f (x, y, 0.);
+	glVertex3f (x, y + h, 0.);
+	glVertex3f (x + w, y + h, 0.);
+	glVertex3f (x + w, y, 0.);
+	glEnd ();
+}

engine/DrawingsGL.h

@@ -17,5 +17,6 @@ void DrawDisc(float radius, int segments);
 void DrawCircle(float radius, int segments);
 void DrawCone(int segments);
 void DrawVector(vector3d start, vector3d end);
+void DrawRect2D (float x, float y, float w, float h);
 
 #endif /* _DRAWINGSGL_H */

engine/Engine.cc

@@ -244,7 +244,9 @@ void Engine::OnMainLoop () {
 		mEventManager->Process();
 		mModel->UpdateTimer ();
 		mModel->Process ();
+		mController->IMGUIPrepare();
 		mView->Draw ();
+		mController->IMGUIFinish();
 	}
 }
 

engine/IMGUIControls.cc

@@ -0,0 +1,100 @@
+#include "IMGUIControls.h"
+
+#include "Engine.h"
+#include "ControllerBase.h"
+#include "ViewBase.h"
+#include <GL/gl.h>
+#include "DrawingsGL.h"
+#include "keytable.h"
+
+Engine::ControllerBase *controller = NULL;
+Engine::ViewBase *view = NULL;
+
+namespace Engine {
+namespace GUI {
+
+/** \brief Checks whether the mouse is in the given rectangle */
+bool regionhit (int x, int y, int w, int h) {
+	controller = EngineGetController();
+	assert (controller);
+
+	int mouse_pos[2];
+
+	controller->GetMouseScreenPosition(mouse_pos);
+
+	if (mouse_pos[0] < x ||
+			mouse_pos[1] < y ||
+			mouse_pos[0] >= x + w ||
+			mouse_pos[1] >= y + h)
+		return false;
+	return true;
+}
+
+void Label (int id, const char* caption, int x, int y) {
+	if (caption != NULL) {
+		float width, height;
+		view = EngineGetView ();
+		assert (view);
+
+		glColor3f (1., 1., 1.);
+		view->DrawGLStringMeasure(caption, &width, &height);
+		view->DrawGLString(x , y + height * 0.5, caption);
+	}
+}
+
+/** \brief Draws a button at the given position
+ *
+ * \returns true if it was clicked
+ *
+ */
+bool Button (int id, const char* caption, int x, int y, int w, int h) {
+	controller = EngineGetController();
+	assert (controller);
+
+	// Check for hotness
+	if (regionhit (x, y, w, h)) {
+		controller->uistate.hotitem = id;
+		if (controller->uistate.activeitem == 0 
+				&& controller->GetButtonState(MouseButtonLeft))
+			controller->uistate.activeitem = id;
+	}
+
+	// Render
+	glColor3f (0.2, 0.2, 0.2);
+	DrawRect2D (x + 4, y + 4, w, h);
+
+	if (controller->uistate.hotitem == id) {
+		if (controller->uistate.activeitem == id) {
+			glColor3f (0.8, 0.8, 0.8);
+			DrawRect2D (x, y, w, h);
+		} else {
+			glColor3f (0.7, 0.7, 0.7);
+			DrawRect2D (x, y, w, h);
+		}
+	} else {
+		glColor3f (0.4, 0.4, 0.4);
+		DrawRect2D (x, y, w, h);
+	}
+
+	// Caption
+	if (caption != NULL) {
+		float width, height;
+		view = EngineGetView ();
+		assert (view);
+
+		glColor3f (1., 1., 1.);
+		view->DrawGLStringMeasure(caption, &width, &height);
+		view->DrawGLString(x + w * 0.5 - width * 0.5, y + h * 0.5 - height * 0.5, caption);
+	}
+
+	// Logic
+	if (controller->GetButtonState(MouseButtonLeft) == false
+			&& controller->uistate.hotitem == id
+			&& controller->uistate.activeitem == id)
+		return true;
+
+	return false;
+}
+
+};
+};

engine/IMGUIControls.h

@@ -0,0 +1,27 @@
+#ifndef _IMGUICONTROLS_H
+#define _IMGUICONTROLS_H
+
+namespace Engine {
+
+namespace GUI {
+
+/** \brief Checks whether the mouse is in the given rectangle */
+bool regionhit (int x, int y, int w, int h);
+
+/** \brief Draws a label at the given position with vertical center at y */
+void Label (int id, const char* caption, int x, int y);
+
+/** \brief Draws a button at the given position
+ *
+ * The caption will be centered in the middle of the clickable area.
+ *
+ * \returns true if it was clicked
+ *
+ */
+bool Button (int id, const char* caption, int x, int y, int w, int h);
+
+};
+
+};
+
+#endif /* _IMGUICONTROLS_H */

engine/ViewBase.cc

@@ -22,7 +22,7 @@ static ViewBase* ViewInstance = NULL;
 void InitGL () {
 	glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
 	glClearDepth(1.0);
-	glDepthFunc(GL_LESS);
+	glDepthFunc(GL_LEQUAL);
 	glEnable(GL_DEPTH_TEST);
 	glShadeModel(GL_SMOOTH);
 	glEnable (GL_CULL_FACE);
@@ -245,6 +245,12 @@ void ViewBase::DrawGLString (float x, float y, const char* str) {
 	mCurrentFont->draw (x, y, str);
 }
 
+void ViewBase::DrawGLStringMeasure (const char* str, float *width, float *height) {
+	OGLFT::BBox bbox = mCurrentFont->measure (str);
+	*width = bbox.x_max_ - bbox.x_min_;
+	*height = bbox.y_max_ - bbox.y_min_;
+}
+
 void ViewBase::GetCamereEye (float *eye_out) {
 	assert (mCamera);
 	mCamera->GetEye (eye_out);

engine/ViewBase.h

@@ -42,6 +42,8 @@ class ViewBase : public Module{
 		/** \brief Draws a string at the given position using current projection
 		 * and modelview matrices */
 		void DrawGLString (float x, float y, const char* str);
+		/** \brief Computes the width and height of the rasterized string */
+		void DrawGLStringMeasure (const char* str, float *width, float *height);
 
 		/** \brief Stores the eye poisition in eye_out */
 		void GetCamereEye (float *eye_out);