Minor tweaks to "Memory override" pull request

Fixed cross that appears when hovering window close button to be perfectly 45 degrees.

README.md

@@ -1,17 +1,18 @@
 ImGui
 =====
 
-ImGui is a bloat-free graphical user interface library for C++. It is portable, renderer agnostic and carries minimal amount of dependencies (only 3 files are needed). It is based on an "immediate" graphical user interface paradigm which allows you to build simple user interfaces with ease.
+ImGui is a bloat-free graphical user interface library for C++. It outputs vertex buffers that you can render in your 3D-pipeline enabled application. It is portable, renderer agnostic and carries minimal amount of dependencies (only 3 files are needed). It is based on an "immediate" graphical user interface paradigm which allows you to build simple user interfaces with ease.
 
-ImGui is designed to allow programmers to create "content creation" or "debug" tools (as opposed to tools for the average end-user). It favors simplicity and thus lacks certain features normally found in more high-level libraries, such as string localisation.
+ImGui is designed to enable fast iteration and allow programmers to create "content creation" or "debug" tools (as opposed to tools for the average end-user). It favors simplicity and thus lacks certain features normally found in more high-level libraries, such as string localisation.
 
-Usage example:
+ImGui is particularly suited to integration in 3D applications, fullscreen applications, embedded applications, games, or any applications on consoles platforms where operating system features are non-standard. 
+
+After ImGui is setup in your engine, you can use it like in this example:
 
 ![screenshot of sample code alongside its output with ImGui](/web/code_sample_01.png?raw=true)
 
 ImGui outputs vertex buffers and simple command-lists that you can render in your application. Because it doesn't know or touch graphics state directly, you can call ImGui commands anywhere in your code (e.g. in the middle of a running algorithm, or in the middle of your own rendering process). Refer to the sample applications in the examples/ folder for instructions on how to integrate ImGui with your existing codebase. 
 
-
 Gallery
 -------
 
@@ -20,14 +21,45 @@ Gallery
 ![screenshot 3](/web/test_window_03.png?raw=true)
 ![screenshot 4](/web/test_window_04.png?raw=true)
 
+References
+----------
+
+The Immediate Mode GUI paradigm may at first appear unusual to some users. This is mainly because "Retained Mode" GUIs have been so widespread and predominant. The following links can give you a better understanding about how Immediate Mode GUIs works. 
+- [Johannes 'johno' Norneby's article](http://www.johno.se/book/imgui.html).
+- [A presentation by Rickard Gustafsson and Johannes Algelind](http://www.cse.chalmers.se/edu/year/2011/course/TDA361/Advanced%20Computer%20Graphics/IMGUI.pdf).
+- [Jari Komppa's tutorial on building an ImGui library](http://iki.fi/sol/imgui/).
+- [Casey Muratori's original video that popularized the concept](https://mollyrocket.com/861).
+
+Frequently Asked Question
+-------------------------
+<b>How do you use ImGui on a platform that may not have a mouse and keyboard?</b>
+
+I recommend using [Synergy](http://synergy-project.org) and the uSynergy.c micro client to share your mouse and keyboard. This way you can seemingly use your PC input devices on a video game console or a tablet. ImGui was also designed to function with touch inputs if you increase the padding of widgets to compensate for the lack of precision of touch devices, but it is recommended you use a mouse to allow optimising for screen real-estate.
+
+<b>I integrated ImGui in my engine and the text or lines are blurry..</b>
+
+- Try adjusting ImGui::GetIO().PixelCenterOffset to 0.0f or 0.5f.
+- In your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f).
+
+<b>Can you create elaborate/serious tools with ImGui?</b>
+
+Yes. I have written data browsers, debuggers, profilers and all sort of non-trivial tools with the library. There's no reason you cannot, and in my experience the simplicity of the API is very empowering. However note that ImGui is programmer centric and the immediate-mode GUI paradigm might requires a bit of adaptation before you can realize its full potential. 
+
+<b>Can you reskin the look of ImGui?</b>
+
+Yes, you can alter the look of the interface to some degree: changing colors, sizes and padding, font. However, as ImGui is designed and optimised to create debug tools, the amount of skinning you can apply is limited. There is only so much you can stray away from the default look and feel of the interface. The example below uses modified settings to create a more compact UI with different colors:
+
+![skinning screenshot 1](/web/skinning_sample_01.png?raw=true)
+
+
 Credits
 -------
 
 Developed by [Omar Cornut](http://www.miracleworld.net). The library was developed with the support of [Media Molecule](http://www.mediamolecule.com) and first used internally on the game [Tearaway](http://tearaway.mediamolecule.com). 
 
-Embeds [proggy_clean](http://www.proggyfonts.net/) font by Tristan Grimmer (also MIT license).
+Embeds [proggy_clean](http://upperbounds.net) font by Tristan Grimmer (also MIT license).
 
-Inspiration, feedback, and testing: Casey Muratori, Atman Binstock, Mikko Mononen, Emmanuel Briney, Stefan Kamoda, Matt Willis. Thanks!
+Inspiration, feedback, and testing: Casey Muratori, Atman Binstock, Mikko Mononen, Emmanuel Briney, Stefan Kamoda, Anton Mikhailov, Matt Willis. Thanks!
 
 License
 -------

examples/directx9_example/main.cpp

@@ -5,184 +5,101 @@
 #include <dinput.h>
 #include "../../imgui.h"
 
-#pragma warning (disable: 4996)		// 'This function or variable may be unsafe': strdup
+#pragma warning (disable: 4996)     // 'This function or variable may be unsafe': strdup
 
 static HWND hWnd;
-static LPDIRECT3D9             g_pD3D = NULL;		// Used to create the D3DDevice
+static LPDIRECT3D9             g_pD3D = NULL;       // Used to create the D3DDevice
 static LPDIRECT3DDEVICE9       g_pd3dDevice = NULL; // Our rendering device
-static LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL;		// Buffer to hold vertices
-static LPDIRECT3DTEXTURE9      g_pTexture = NULL;	// Our texture
-
+static LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL;        // Buffer to hold vertices
+static LPDIRECT3DTEXTURE9      g_pTexture = NULL;   // Our texture
 struct CUSTOMVERTEX
 {
-    D3DXVECTOR3	position;
-    D3DCOLOR	color;
-    float		tu, tv;
+    D3DXVECTOR3 position;
+    D3DCOLOR    color;
+    float       tu, tv;
 };
-
 #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
 
+// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
+// If text or lines are blurry when integrating ImGui in your engine:
+// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
+// - try adjusting ImGui::GetIO().PixelCenterOffset to 0.5f or 0.375f
 static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
 {
-	size_t total_vtx_count = 0;
-	for (int n = 0; n < cmd_lists_count; n++)
-		total_vtx_count += cmd_lists[n]->vtx_buffer.size();
-	if (total_vtx_count == 0)
-		return;
+    size_t total_vtx_count = 0;
+    for (int n = 0; n < cmd_lists_count; n++)
+        total_vtx_count += cmd_lists[n]->vtx_buffer.size();
+    if (total_vtx_count == 0)
+        return;
 
-	ImVector<ImVec4> clip_rect_stack;
-	clip_rect_stack.push_back(ImVec4(-9999,-9999,+9999,+9999));
-
-	// Setup orthographic projection
-	// Set up world matrix
-	D3DXMATRIXA16 mat;
-	D3DXMatrixIdentity(&mat);
-	g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat);
-	g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat);
-	D3DXMatrixOrthoOffCenterLH(&mat, 0.0f, ImGui::GetIO().DisplaySize.x, ImGui::GetIO().DisplaySize.y, 0.0f, -1.0f, +1.0f);
-	g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat);
-    
-	D3DSURFACE_DESC texture_desc;
-	g_pTexture->GetLevelDesc(0, &texture_desc);
-
-    // Fill the vertex buffer
+    // Copy and convert all vertices into a single contiguous buffer
     CUSTOMVERTEX* vtx_dst;
     if (g_pVB->Lock(0, total_vtx_count, (void**)&vtx_dst, D3DLOCK_DISCARD) < 0)
         return;
-
-	for (int n = 0; n < cmd_lists_count; n++)
-	{
-		const ImDrawList* cmd_list = cmd_lists[n];
-		if (cmd_list->commands.empty() || cmd_list->vtx_buffer.empty())
-			continue;
-		const ImDrawVert* vtx_src = &cmd_list->vtx_buffer[0];
-		for (size_t i = 0; i < cmd_list->vtx_buffer.size(); i++)
-		{
-			vtx_dst->position.x = vtx_src->pos.x;
-			vtx_dst->position.y = vtx_src->pos.y;
-			vtx_dst->position.z = 0.0f;
-			vtx_dst->color = (vtx_src->col & 0xFF00FF00) | ((vtx_src->col & 0xFF0000)>>16) | ((vtx_src->col & 0xFF) << 16);		// RGBA --> ARGB for DirectX9
-			vtx_dst->tu = vtx_src->uv.x;
-			vtx_dst->tv = vtx_src->uv.y;
-			vtx_dst++;
-			vtx_src++;
-		}
-	}
+    for (int n = 0; n < cmd_lists_count; n++)
+    {
+        const ImDrawList* cmd_list = cmd_lists[n];
+        const ImDrawVert* vtx_src = &cmd_list->vtx_buffer[0];
+        for (size_t i = 0; i < cmd_list->vtx_buffer.size(); i++)
+        {
+            vtx_dst->position.x = vtx_src->pos.x;
+            vtx_dst->position.y = vtx_src->pos.y;
+            vtx_dst->position.z = 0.0f;
+            vtx_dst->color = (vtx_src->col & 0xFF00FF00) | ((vtx_src->col & 0xFF0000)>>16) | ((vtx_src->col & 0xFF) << 16);     // RGBA --> ARGB for DirectX9
+            vtx_dst->tu = vtx_src->uv.x;
+            vtx_dst->tv = vtx_src->uv.y;
+            vtx_dst++;
+            vtx_src++;
+        }
+    }
     g_pVB->Unlock();
 
-	g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof( CUSTOMVERTEX ) );
-	g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );
+    g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof( CUSTOMVERTEX ) );
+    g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );
 
-	// Setup render state: alpha-blending enabled, no face culling, no depth testing
+    // Setup render state: alpha-blending, no face culling, no depth testing
     g_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );
     g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, false );
     g_pd3dDevice->SetRenderState( D3DRS_ZENABLE, false );
+    g_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, true );
+    g_pd3dDevice->SetRenderState( D3DRS_BLENDOP, D3DBLENDOP_ADD );
+    g_pd3dDevice->SetRenderState( D3DRS_ALPHATESTENABLE, false );
+    g_pd3dDevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );
+    g_pd3dDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA );
+    g_pd3dDevice->SetRenderState( D3DRS_SCISSORTESTENABLE, true );
 
-	g_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, true );
-	g_pd3dDevice->SetRenderState( D3DRS_BLENDOP, D3DBLENDOP_ADD );
-	g_pd3dDevice->SetRenderState( D3DRS_ALPHATESTENABLE, false );
-	g_pd3dDevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );
-	g_pd3dDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA );
-	g_pd3dDevice->SetRenderState( D3DRS_SCISSORTESTENABLE, true );
+    // Setup texture
+    g_pd3dDevice->SetTexture( 0, g_pTexture );
+    g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_MODULATE );
+    g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
+    g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );
+    g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_MODULATE );
+    g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE );
+    g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE );
 
-	// Setup texture
-	g_pd3dDevice->SetTexture( 0, g_pTexture );
-	g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_MODULATE );
-	g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
-	g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );
-	g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_MODULATE );
-	g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE );
-	g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE );
+    // Setup orthographic projection matrix
+    D3DXMATRIXA16 mat;
+    D3DXMatrixIdentity(&mat);
+    g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat);
+    g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat);
+    D3DXMatrixOrthoOffCenterLH(&mat, 0.5f, ImGui::GetIO().DisplaySize.x+0.5f, ImGui::GetIO().DisplaySize.y+0.5f, 0.5f, -1.0f, +1.0f);
+    g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat);
 
-	int vtx_consumed = 0;					// offset in vertex buffer. each command consume ImDrawCmd::vtx_count of those
-	bool clip_rect_dirty = true;
-
-	for (int n = 0; n < cmd_lists_count; n++)
-	{
-		const ImDrawList* cmd_list = cmd_lists[n];
-		if (cmd_list->commands.empty() || cmd_list->vtx_buffer.empty())
-			continue;
-		const ImDrawCmd* pcmd = &cmd_list->commands.front();
-		const ImDrawCmd* pcmd_end = &cmd_list->commands.back();
-		int clip_rect_buf_consumed = 0;		// offset in cmd_list->clip_rect_buffer. each PushClipRect command consume 1 of those.
-		while (pcmd <= pcmd_end)
-		{
-			const ImDrawCmd& cmd = *pcmd++;
-			switch (cmd.cmd_type)
-			{
-			case ImDrawCmdType_DrawTriangleList:
-				if (clip_rect_dirty)
-				{
-					const ImVec4& clip_rect = clip_rect_stack.back();
-					const RECT r = { (LONG)clip_rect.x, (LONG)clip_rect.y, (LONG)clip_rect.z, (LONG)clip_rect.w };
-					g_pd3dDevice->SetScissorRect(&r);
-					clip_rect_dirty = false;
-				}
-				g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, vtx_consumed, cmd.vtx_count/3);
-				vtx_consumed += cmd.vtx_count;
-				break;
-
-			case ImDrawCmdType_PushClipRect:
-				clip_rect_stack.push_back(cmd_list->clip_rect_buffer[clip_rect_buf_consumed++]);
-				clip_rect_dirty = true;
-				break;
-
-			case ImDrawCmdType_PopClipRect:
-				clip_rect_stack.pop_back();
-				clip_rect_dirty = true;
-				break;
-			}
-		}
-	}
-}
-
-// Get text data in Win32 clipboard
-static const char* ImImpl_GetClipboardTextFn()
-{
-	static char* buf_local = NULL;
-	if (buf_local)
-	{
-		free(buf_local);
-		buf_local = NULL;
-	}
-
-	if (!OpenClipboard(NULL)) 
-		return NULL;
-
-	HANDLE buf_handle = GetClipboardData(CF_TEXT); 
-	if (buf_handle == NULL)
-		return NULL;
-
-	if (char* buf_global = (char*)GlobalLock(buf_handle))
-		buf_local = strdup(buf_global);
-	GlobalUnlock(buf_handle); 
-	CloseClipboard(); 
-
-	return buf_local;
-}
-
-// Set text data in Win32 clipboard
-static void ImImpl_SetClipboardTextFn(const char* text, const char* text_end)
-{
-	if (!OpenClipboard(NULL))
-		return;
-
-	if (!text_end)
-		text_end = text + strlen(text);
-
-	const int buf_length = (text_end - text) + 1;
-	HGLOBAL buf_handle = GlobalAlloc(GMEM_MOVEABLE, buf_length * sizeof(char)); 
-	if (buf_handle == NULL)
-		return;
-
-	char* buf_global = (char *)GlobalLock(buf_handle); 
-	memcpy(buf_global, text, text_end - text);
-	buf_global[text_end - text] = 0;
-	GlobalUnlock(buf_handle); 
-
-	EmptyClipboard();
-	SetClipboardData(CF_TEXT, buf_handle);
-	CloseClipboard();
+    // Render command lists
+    int vtx_offset = 0;
+    for (int n = 0; n < cmd_lists_count; n++)
+    {
+        // Render command list
+        const ImDrawList* cmd_list = cmd_lists[n];
+        const ImDrawCmd* pcmd_end = cmd_list->commands.end();
+        for (const ImDrawCmd* pcmd = cmd_list->commands.begin(); pcmd != pcmd_end; pcmd++)
+        {
+            const RECT r = { (LONG)pcmd->clip_rect.x, (LONG)pcmd->clip_rect.y, (LONG)pcmd->clip_rect.z, (LONG)pcmd->clip_rect.w };
+            g_pd3dDevice->SetScissorRect(&r);
+            g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, vtx_offset, pcmd->vtx_count/3);
+            vtx_offset += pcmd->vtx_count;
+        }
+    }
 }
 
 HRESULT InitD3D(HWND hWnd)
@@ -197,7 +114,7 @@ HRESULT InitD3D(HWND hWnd)
     d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
     d3dpp.EnableAutoDepthStencil = TRUE;
     d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
-	d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
+    d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
 
     // Create the D3DDevice
     if (g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &d3dpp, &g_pd3dDevice) < 0)
@@ -220,93 +137,119 @@ void Cleanup()
 
 LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
-	ImGuiIO& io = ImGui::GetIO();
-	switch (msg)
-	{
-	case WM_LBUTTONDOWN:
-		io.MouseDown[0] = true;
-		return true;
-	case WM_LBUTTONUP:
-		io.MouseDown[0] = false; 
-		return true;
-	case WM_RBUTTONDOWN:
-		io.MouseDown[1] = true; 
-		return true;
-	case WM_RBUTTONUP:
-		io.MouseDown[1] = false; 
-		return true;
-	case WM_MOUSEWHEEL:
-		// Mouse wheel: -1,0,+1
-		io.MouseWheel = GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1 : -1;
-		return true;
-	case WM_MOUSEMOVE:
-		// Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
-		io.MousePos.x = (signed short)(lParam);
-		io.MousePos.y = (signed short)(lParam >> 16); 
-		return true;
-	case WM_CHAR:
-		// You can also use ToAscii()+GetKeyboardState() to retrieve characters.
-		if (wParam > 1 && wParam < 256)
-			io.AddInputCharacter((char)wParam);
-		return true;
-	case WM_DESTROY:
-		{
-			Cleanup();
-			PostQuitMessage(0);
-			return 0;
-		}
-	}
+    ImGuiIO& io = ImGui::GetIO();
+    switch (msg)
+    {
+    case WM_LBUTTONDOWN:
+        io.MouseDown[0] = true;
+        return true;
+    case WM_LBUTTONUP:
+        io.MouseDown[0] = false; 
+        return true;
+    case WM_RBUTTONDOWN:
+        io.MouseDown[1] = true; 
+        return true;
+    case WM_RBUTTONUP:
+        io.MouseDown[1] = false; 
+        return true;
+    case WM_MOUSEWHEEL:
+        // Mouse wheel: -1,0,+1
+        io.MouseWheel = GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1 : -1;
+        return true;
+    case WM_MOUSEMOVE:
+        // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
+        io.MousePos.x = (signed short)(lParam);
+        io.MousePos.y = (signed short)(lParam >> 16); 
+        return true;
+    case WM_CHAR:
+        // You can also use ToAscii()+GetKeyboardState() to retrieve characters.
+        if (wParam > 1 && wParam < 256)
+            io.AddInputCharacter((char)wParam);
+        return true;
+    case WM_DESTROY:
+        {
+            Cleanup();
+            PostQuitMessage(0);
+            return 0;
+        }
+    }
     return DefWindowProc(hWnd, msg, wParam, lParam);
 }
 
 void InitImGui()
 {
-	RECT rect;
-	GetClientRect(hWnd, &rect);
+    RECT rect;
+    GetClientRect(hWnd, &rect);
 
-	ImGuiIO& io = ImGui::GetIO();
-	io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));	// Display size, in pixels. For clamping windows positions.
-	io.DeltaTime = 1.0f/60.0f;																	// Time elapsed since last frame, in seconds (in this sample app we'll override this every frame because our timestep is variable)
-	io.PixelCenterOffset = 0.0f;																// Align Direct3D Texels
-	io.KeyMap[ImGuiKey_Tab] = VK_TAB;															// Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array that we will update during the application lifetime.
-	io.KeyMap[ImGuiKey_LeftArrow] = VK_LEFT;
-	io.KeyMap[ImGuiKey_RightArrow] = VK_RIGHT;
-	io.KeyMap[ImGuiKey_UpArrow] = VK_UP;
-	io.KeyMap[ImGuiKey_DownArrow] = VK_UP;
-	io.KeyMap[ImGuiKey_Home] = VK_HOME;
-	io.KeyMap[ImGuiKey_End] = VK_END;
-	io.KeyMap[ImGuiKey_Delete] = VK_DELETE;
-	io.KeyMap[ImGuiKey_Backspace] = VK_BACK;
-	io.KeyMap[ImGuiKey_Enter] = VK_RETURN;
-	io.KeyMap[ImGuiKey_Escape] = VK_ESCAPE;
-	io.KeyMap[ImGuiKey_A] = 'A';
-	io.KeyMap[ImGuiKey_C] = 'C';
-	io.KeyMap[ImGuiKey_V] = 'V';
-	io.KeyMap[ImGuiKey_X] = 'X';
-	io.KeyMap[ImGuiKey_Y] = 'Y';
-	io.KeyMap[ImGuiKey_Z] = 'Z';
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));  // Display size, in pixels. For clamping windows positions.
+    io.DeltaTime = 1.0f/60.0f;                                                                  // Time elapsed since last frame, in seconds (in this sample app we'll override this every frame because our timestep is variable)
+    io.PixelCenterOffset = 0.0f;                                                                // Align Direct3D Texels
+    io.KeyMap[ImGuiKey_Tab] = VK_TAB;                                                           // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array that we will update during the application lifetime.
+    io.KeyMap[ImGuiKey_LeftArrow] = VK_LEFT;
+    io.KeyMap[ImGuiKey_RightArrow] = VK_RIGHT;
+    io.KeyMap[ImGuiKey_UpArrow] = VK_UP;
+    io.KeyMap[ImGuiKey_DownArrow] = VK_UP;
+    io.KeyMap[ImGuiKey_Home] = VK_HOME;
+    io.KeyMap[ImGuiKey_End] = VK_END;
+    io.KeyMap[ImGuiKey_Delete] = VK_DELETE;
+    io.KeyMap[ImGuiKey_Backspace] = VK_BACK;
+    io.KeyMap[ImGuiKey_Enter] = VK_RETURN;
+    io.KeyMap[ImGuiKey_Escape] = VK_ESCAPE;
+    io.KeyMap[ImGuiKey_A] = 'A';
+    io.KeyMap[ImGuiKey_C] = 'C';
+    io.KeyMap[ImGuiKey_V] = 'V';
+    io.KeyMap[ImGuiKey_X] = 'X';
+    io.KeyMap[ImGuiKey_Y] = 'Y';
+    io.KeyMap[ImGuiKey_Z] = 'Z';
 
-	io.RenderDrawListsFn = ImImpl_RenderDrawLists;
-	io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
-	io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
+    io.RenderDrawListsFn = ImImpl_RenderDrawLists;
+    
+    // Create the vertex buffer
+    if (g_pd3dDevice->CreateVertexBuffer(10000 * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
+    {
+        IM_ASSERT(0);
+        return;
+    }
 
-	
-	// Create the vertex buffer
-	if (g_pd3dDevice->CreateVertexBuffer(10000 * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
-	{
-		IM_ASSERT(0);
-		return;
-	}
+    // Load font texture
+    const void* png_data;
+    unsigned int png_size;
+    ImGui::GetDefaultFontData(NULL, NULL, &png_data, &png_size);
+    if (D3DXCreateTextureFromFileInMemory(g_pd3dDevice, png_data, png_size, &g_pTexture) < 0)
+    {
+        IM_ASSERT(0);
+        return;
+    }
+}
 
-	// Load font texture
-	const void* png_data;
-	unsigned int png_size;
-	ImGui::GetDefaultFontData(NULL, NULL, &png_data, &png_size);
-	if (D3DXCreateTextureFromFileInMemory(g_pd3dDevice, png_data, png_size, &g_pTexture) < 0)
-	{
-		IM_ASSERT(0);
-		return;
-	}
+INT64 ticks_per_second = 0;
+INT64 time = 0;
+
+void UpdateImGui()
+{
+    ImGuiIO& io = ImGui::GetIO();
+
+    // Setup timestep
+    INT64 current_time;
+    QueryPerformanceCounter((LARGE_INTEGER *)&current_time); 
+    io.DeltaTime = (float)(current_time - time) / ticks_per_second;
+    time = current_time;
+
+    // Setup inputs
+    // (we already got mouse position, buttons, wheel from the window message callback)
+    BYTE keystate[256];
+    GetKeyboardState(keystate);
+    for (int i = 0; i < 256; i++)
+        io.KeysDown[i] = (keystate[i] & 0x80) != 0;
+    io.KeyCtrl = (keystate[VK_CONTROL] & 0x80) != 0;
+    io.KeyShift = (keystate[VK_SHIFT] & 0x80) != 0;
+    // io.MousePos : filled by WM_MOUSEMOVE event
+    // io.MouseDown : filled by WM_*BUTTON* events
+    // io.MouseWheel : filled by WM_MOUSEWHEEL events
+
+    // Start the frame
+    ImGui::NewFrame();
 }
 
 int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
@@ -318,102 +261,94 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
     // Create the application's window
     hWnd = CreateWindow(L"ImGui Example", L"ImGui DirectX9 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
 
-	INT64 ticks_per_second, time;
-	if (!QueryPerformanceFrequency((LARGE_INTEGER *)&ticks_per_second))
-		return 1;
-	if (!QueryPerformanceCounter((LARGE_INTEGER *)&time))
-		return 1;
+    if (!QueryPerformanceFrequency((LARGE_INTEGER *)&ticks_per_second))
+        return 1;
+    if (!QueryPerformanceCounter((LARGE_INTEGER *)&time))
+        return 1;
 
-	// Initialize Direct3D
-    if (InitD3D(hWnd) >= 0)
+    // Initialize Direct3D
+    if (InitD3D(hWnd) < 0)
     {
-        // Show the window
-        ShowWindow(hWnd, SW_SHOWDEFAULT);
-        UpdateWindow(hWnd);
-
-		InitImGui();
-
-        // Enter the message loop
-        MSG msg;
-        ZeroMemory(&msg, sizeof(msg));
-        while (msg.message != WM_QUIT)
-        {
-            if (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
-            {
-                TranslateMessage(&msg);
-                DispatchMessage(&msg);
-				continue;
-            }
-		
-			// 1) ImGui start frame, setup time delta & inputs
-			ImGuiIO& io = ImGui::GetIO();
-			INT64 current_time;
-			QueryPerformanceCounter((LARGE_INTEGER *)&current_time); 
-			io.DeltaTime = (float)(current_time - time) / ticks_per_second;
-			time = current_time;
-			BYTE keystate[256];
-			GetKeyboardState(keystate);
-			for (int i = 0; i < 256; i++)
-				io.KeysDown[i] = (keystate[i] & 0x80) != 0;
-			io.KeyCtrl = (keystate[VK_CONTROL] & 0x80) != 0;
-			io.KeyShift = (keystate[VK_SHIFT] & 0x80) != 0;
-			// io.MousePos : filled by WM_MOUSEMOVE event
-			// io.MouseDown : filled by WM_*BUTTON* events
-			// io.MouseWheel : filled by WM_MOUSEWHEEL events
-			ImGui::NewFrame();
-
-			// 2) ImGui usage
-			static bool show_test_window = true;
-			static bool show_another_window = false;
-			static float f;
-			ImGui::Text("Hello, world!");
-			ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
-			show_test_window ^= ImGui::Button("Test Window");
-			show_another_window ^= ImGui::Button("Another Window");
-
-			// Calculate and show framerate
-			static float ms_per_frame[120] = { 0 };
-			static int ms_per_frame_idx = 0;
-			static float ms_per_frame_accum = 0.0f;
-			ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
-			ms_per_frame[ms_per_frame_idx] = io.DeltaTime * 1000.0f;
-			ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
-			ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
-			const float ms_per_frame_avg = ms_per_frame_accum / 120;
-			ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
-
-			if (show_test_window)
-			{
-				// More example code in ShowTestWindow()
-				ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));		// Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
-				ImGui::ShowTestWindow(&show_test_window);
-			}
-
-			if (show_another_window)
-			{
-				ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
-				ImGui::Text("Hello");
-				ImGui::End();
-			}
-
-			// 3) Render
-		    g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
-			g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
-			g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, false);
-			g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(204, 153, 153), 1.0f, 0);	// Clear the backbuffer and the zbuffer
-			if (g_pd3dDevice->BeginScene() >= 0)
-			{
-				ImGui::Render();
-				g_pd3dDevice->EndScene();
-			}
-		    g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
-		}
-
-		ImGui::Shutdown();
+        if (g_pVB)
+            g_pVB->Release();
+        UnregisterClass(L"ImGui Example", wc.hInstance);
+        return 1;
     }
 
-	if (g_pVB)
-		g_pVB->Release();
+    // Show the window
+    ShowWindow(hWnd, SW_SHOWDEFAULT);
+    UpdateWindow(hWnd);
+
+    InitImGui();
+
+    // Enter the message loop
+    MSG msg;
+    ZeroMemory(&msg, sizeof(msg));
+    while (msg.message != WM_QUIT)
+    {
+        if (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        {
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+            continue;
+        }
+        
+        UpdateImGui();
+
+        // Create a simple window
+        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
+        static bool show_test_window = true;
+        static bool show_another_window = false;
+        static float f;
+        ImGui::Text("Hello, world!");
+        ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+        show_test_window ^= ImGui::Button("Test Window");
+        show_another_window ^= ImGui::Button("Another Window");
+
+        // Calculate and show framerate
+        static float ms_per_frame[120] = { 0 };
+        static int ms_per_frame_idx = 0;
+        static float ms_per_frame_accum = 0.0f;
+        ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
+        ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
+        ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
+        ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
+        const float ms_per_frame_avg = ms_per_frame_accum / 120;
+        ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
+
+        // Show the ImGui test window
+        // Most of user example code is in ImGui::ShowTestWindow()
+        if (show_test_window)
+        {
+            ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));     // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
+            ImGui::ShowTestWindow(&show_test_window);
+        }
+
+        // Show another simple window
+        if (show_another_window)
+        {
+            ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
+            ImGui::Text("Hello");
+            ImGui::End();
+        }
+
+        // Rendering
+        g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
+        g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
+        g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, false);
+        g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(204, 153, 153), 1.0f, 0);
+        if (g_pd3dDevice->BeginScene() >= 0)
+        {
+            ImGui::Render();
+            g_pd3dDevice->EndScene();
+        }
+        g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
+    }
+
+    ImGui::Shutdown();
+
+    if (g_pVB)
+        g_pVB->Release();
 
     UnregisterClass(L"ImGui Example", wc.hInstance);
     return 0;

examples/opengl_example/Makefile.Linux

@@ -0,0 +1,18 @@
+#
+# Quick and dirty makefile to build on Linux
+# tested on Ubuntu 14.04.1 32bit
+#
+
+SRC = main.cpp ../../imgui.cpp
+
+OBJ = $(SRC:.cpp=.o)
+
+CXXFLAGS = -I../../ `pkg-config --cflags glfw3`
+
+LIBS = `pkg-config --static --libs glfw3` -lGLEW
+
+all: $(OBJ)
+	$(CXX) $(OBJ) $(LIBS)
+
+clean:
+	$(RM) -f $(OBJ)

examples/opengl_example/Makefile.Macosx

@@ -0,0 +1,18 @@
+# This makefile currently only works for mac os
+# You should install via homebrew:
+#    brew install glew
+#    brew install glfw3
+#
+
+CXXFLAGS=-framework OpenGL -framework Cocoa -framework IOKit 
+CXXFLAGS+=-I/usr/local/Cellar/glew/1.10.0/include -I/usr/local/Cellar/glfw3/3.0.4/include
+CXXFLAGS+=-L/usr/local/Cellar/glew/1.10.0/lib -L/usr/local/Cellar/glfw3/3.0.4/lib
+CXXFLAGS+=-lglew -lglfw3
+CXXFLAGS+=-I../../
+CXXFLAGS+= -D__APPLE__
+
+main: main.cpp ../../imgui.cpp
+	$(CXX) $(CXXFLAGS) -o $@ $^
+
+clean:
+	rm main

examples/opengl_example/main.cpp

@@ -2,407 +2,273 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #define STB_IMAGE_IMPLEMENTATION
-#include "stb_image.h"				// for .png loading
+#include "stb_image.h"                  // for .png loading
 #include "../../imgui.h"
 #ifdef _MSC_VER
-#pragma warning (disable: 4996)		// 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
+#pragma warning (disable: 4996)         // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
 #endif
 
 static GLFWwindow* window;
-static GLuint vbo;
-static GLuint vao;
-static GLuint vertexShader;
-static GLuint fragmentShader;
-static GLuint shaderProgram;
 static GLuint fontTex;
-static GLint uniMVP;
-static GLint uniClipRect;
 
+// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
+// If text or lines are blurry when integrating ImGui in your engine:
+// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
+// - try adjusting ImGui::GetIO().PixelCenterOffset to 0.5f or 0.375f
 static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
 {
-	size_t total_vtx_count = 0;
-	for (int n = 0; n < cmd_lists_count; n++)
-		total_vtx_count += cmd_lists[n]->vtx_buffer.size();
-	if (total_vtx_count == 0)
-		return;
+    if (cmd_lists_count == 0)
+        return;
 
-	int read_pos_clip_rect_buf = 0;		// offset in 'clip_rect_buffer'. each PushClipRect command consume 1 of those.
+    // We are using the OpenGL fixed pipeline to make the example code simpler to read!
+    // A probable faster way to render would be to collate all vertices from all cmd_lists into a single vertex buffer.
+    // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers.
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glEnable(GL_SCISSOR_TEST);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
 
-	ImVector<ImVec4> clip_rect_stack;
-	clip_rect_stack.push_back(ImVec4(-9999,-9999,+9999,+9999));
+    // Setup texture
+    glBindTexture(GL_TEXTURE_2D, fontTex);
+    glEnable(GL_TEXTURE_2D);
 
-	// Setup orthographic projection
-	const float L = 0.0f;
-	const float R = ImGui::GetIO().DisplaySize.x;
-	const float B = ImGui::GetIO().DisplaySize.y;
-	const float T = 0.0f;
-	const float mvp[4][4] = 
-	{
-		{ 2.0f/(R-L),	0.0f,			0.0f,		0.0f },
-		{ 0.0f,			2.0f/(T-B),		0.0f,		0.0f },
-		{ 0.0f,			0.0f,			-1.0f,		0.0f },
-		{ -(R+L)/(R-L),	-(T+B)/(T-B),	0.0f,		1.0f },
-	};
+    // Setup orthographic projection matrix
+    const float width = ImGui::GetIO().DisplaySize.x;
+    const float height = ImGui::GetIO().DisplaySize.y;
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(0.0f, width, height, 0.0f, -1.0f, +1.0f);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
 
-	glBindBuffer(GL_ARRAY_BUFFER, vbo);
-	glBindVertexArray(vao);
-	glBufferData(GL_ARRAY_BUFFER, total_vtx_count * sizeof(ImDrawVert), NULL, GL_STREAM_DRAW);
-	unsigned char* buffer_data = (unsigned char*)glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
-	if (!buffer_data)
-		return;
-	int vtx_consumed = 0;
-	for (int n = 0; n < cmd_lists_count; n++)
-	{
-		const ImDrawList* cmd_list = cmd_lists[n];
-		if (!cmd_list->vtx_buffer.empty())
-		{
-			memcpy(buffer_data, &cmd_list->vtx_buffer[0], cmd_list->vtx_buffer.size() * sizeof(ImDrawVert));
-			buffer_data += cmd_list->vtx_buffer.size() * sizeof(ImDrawVert);
-			vtx_consumed += cmd_list->vtx_buffer.size();
-		}
-	}
-	glUnmapBuffer(GL_ARRAY_BUFFER);
-	
-	glUseProgram(shaderProgram);
-	glUniformMatrix4fv(uniMVP, 1, GL_FALSE, &mvp[0][0]);
+    // Render command lists
+    for (int n = 0; n < cmd_lists_count; n++)
+    {
+        const ImDrawList* cmd_list = cmd_lists[n];
+        const unsigned char* vtx_buffer = (const unsigned char*)cmd_list->vtx_buffer.begin();
+        glVertexPointer(2, GL_FLOAT, sizeof(ImDrawVert), (void*)(vtx_buffer));
+        glTexCoordPointer(2, GL_FLOAT, sizeof(ImDrawVert), (void*)(vtx_buffer+8));
+        glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ImDrawVert), (void*)(vtx_buffer+16));
 
-	// Setup render state: alpha-blending enabled, no face culling, no depth testing
-	glEnable(GL_BLEND);
-	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-	glDisable(GL_CULL_FACE);
-	glDisable(GL_DEPTH_TEST);
-
-	glBindTexture(GL_TEXTURE_2D, fontTex);
-
-	vtx_consumed = 0;						// offset in vertex buffer. each command consume ImDrawCmd::vtx_count of those
-	bool clip_rect_dirty = true;
-
-	for (int n = 0; n < cmd_lists_count; n++)
-	{
-		const ImDrawList* cmd_list = cmd_lists[n];
-		if (cmd_list->commands.empty() || cmd_list->vtx_buffer.empty())
-			continue;
-		const ImDrawCmd* pcmd = &cmd_list->commands.front();
-		const ImDrawCmd* pcmd_end = &cmd_list->commands.back();
-		int clip_rect_buf_consumed = 0;		// offset in cmd_list->clip_rect_buffer. each PushClipRect command consume 1 of those.
-		while (pcmd <= pcmd_end)
-		{
-			const ImDrawCmd& cmd = *pcmd++;
-			switch (cmd.cmd_type)
-			{
-			case ImDrawCmdType_DrawTriangleList:
-				if (clip_rect_dirty)
-				{
-					glUniform4fv(uniClipRect, 1, (float*)&clip_rect_stack.back());
-					clip_rect_dirty = false;
-				}
-				glDrawArrays(GL_TRIANGLES, vtx_consumed, cmd.vtx_count);
-				vtx_consumed += cmd.vtx_count;
-				break;
-
-			case ImDrawCmdType_PushClipRect:
-				clip_rect_stack.push_back(cmd_list->clip_rect_buffer[clip_rect_buf_consumed++]);
-				clip_rect_dirty = true;
-				break;
-
-			case ImDrawCmdType_PopClipRect:
-				clip_rect_stack.pop_back();
-				clip_rect_dirty = true;
-				break;
-			}
-		}
-	}
+        int vtx_offset = 0;
+        const ImDrawCmd* pcmd_end = cmd_list->commands.end();
+        for (const ImDrawCmd* pcmd = cmd_list->commands.begin(); pcmd != pcmd_end; pcmd++)
+        {
+            glScissor((int)pcmd->clip_rect.x, (int)(height - pcmd->clip_rect.w), (int)(pcmd->clip_rect.z - pcmd->clip_rect.x), (int)(pcmd->clip_rect.w - pcmd->clip_rect.y));
+            glDrawArrays(GL_TRIANGLES, vtx_offset, pcmd->vtx_count);
+            vtx_offset += pcmd->vtx_count;
+        }
+    }
+    glDisable(GL_SCISSOR_TEST);
+    glDisableClientState(GL_COLOR_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glDisableClientState(GL_VERTEX_ARRAY);
 }
 
 static const char* ImImpl_GetClipboardTextFn()
 {
-	return glfwGetClipboardString(window);
+    return glfwGetClipboardString(window);
 }
 
 static void ImImpl_SetClipboardTextFn(const char* text, const char* text_end)
 {
-	if (!text_end)
-		text_end = text + strlen(text);
+    if (!text_end)
+        text_end = text + strlen(text);
 
-	char* buf = (char*)malloc(text_end - text + 1);
-	memcpy(buf, text, text_end-text);
-	buf[text_end-text] = '\0';
-	glfwSetClipboardString(window, buf);
-	free(buf);
+    if (*text_end == 0)
+    {
+        // Already got a zero-terminator at 'text_end', we don't need to add one
+        glfwSetClipboardString(window, text);
+    }
+    else
+    {
+        // Add a zero-terminator because glfw function doesn't take a size
+        char* buf = (char*)malloc(text_end - text + 1);
+        memcpy(buf, text, text_end-text);
+        buf[text_end-text] = '\0';
+        glfwSetClipboardString(window, buf);
+        free(buf);
+    }
 }
 
-// Shader sources
-// FIXME-OPT: clip at vertex level
-const GLchar* vertexSource =
-    "#version 150 core\n"
-	"uniform mat4 MVP;"
-    "in vec2 i_pos;"
-	"in vec2 i_uv;"
-	"in vec4 i_col;"
-	"out vec4 col;"
-	"out vec2 pixel_pos;"
-	"out vec2 uv;"
-    "void main() {"
-	"   col = i_col;"
-	"   pixel_pos = i_pos;"
-	"   uv = i_uv;"
-	"   gl_Position = MVP * vec4(i_pos.x, i_pos.y, 0.0f, 1.0f);"
-    "}";
-
-const GLchar* fragmentSource =
-    "#version 150 core\n"
-	"uniform sampler2D Tex;"
-	"uniform vec4 ClipRect;"
-	"in vec4 col;"
-	"in vec2 pixel_pos;"
-	"in vec2 uv;"
-    "out vec4 o_col;"
-    "void main() {"
-    "   o_col = texture(Tex, uv) * col;"
-	//"   if (pixel_pos.x < ClipRect.x || pixel_pos.y < ClipRect.y || pixel_pos.x > ClipRect.z || pixel_pos.y > ClipRect.w) discard;"						// Clipping: using discard	
-	//"   if (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w) < 1.0f) discard;"	// Clipping: using discard and step
-	"   o_col.w *= (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w));"			// Clipping: branch-less, set alpha 0.0f
-    "}";
 
+// GLFW callbacks to get events
 static void glfw_error_callback(int error, const char* description)
 {
     fputs(description, stderr);
 }
 
-static float mouse_wheel = 0.0f;
 static void glfw_scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
 {
-	mouse_wheel = (float)yoffset;
+    ImGuiIO& io = ImGui::GetIO();
+    io.MouseWheel = (yoffset != 0.0f) ? yoffset > 0.0f ? 1 : - 1 : 0;           // Mouse wheel: -1,0,+1
 }
 
 static void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
 {
-	ImGuiIO& io = ImGui::GetIO();
-	if (action == GLFW_PRESS)
-		io.KeysDown[key] = true;
-	if (action == GLFW_RELEASE)
-		io.KeysDown[key] = false;
-	io.KeyCtrl = (mods & GLFW_MOD_CONTROL) != 0;
-	io.KeyShift = (mods & GLFW_MOD_SHIFT) != 0;
+    ImGuiIO& io = ImGui::GetIO();
+    if (action == GLFW_PRESS)
+        io.KeysDown[key] = true;
+    if (action == GLFW_RELEASE)
+        io.KeysDown[key] = false;
+    io.KeyCtrl = (mods & GLFW_MOD_CONTROL) != 0;
+    io.KeyShift = (mods & GLFW_MOD_SHIFT) != 0;
 }
 
 static void glfw_char_callback(GLFWwindow* window, unsigned int c)
 {
-	if (c > 0 && c <= 255)
-		ImGui::GetIO().AddInputCharacter((char)c);
+    if (c > 0 && c <= 255)
+        ImGui::GetIO().AddInputCharacter((char)c);
 }
 
 // OpenGL code based on http://open.gl tutorials
 void InitGL()
 {
-	glfwSetErrorCallback(glfw_error_callback);
+    glfwSetErrorCallback(glfw_error_callback);
 
     if (!glfwInit())
         exit(1);
 
-	//glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-	//glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
-	//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-	//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
-	glfwWindowHint(GLFW_REFRESH_RATE, 60);
-	glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
-	window = glfwCreateWindow(1280, 720, "ImGui OpenGL example", nullptr, nullptr);
-	glfwMakeContextCurrent(window);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+    window = glfwCreateWindow(1280, 720, "ImGui OpenGL example", NULL, NULL);
+    glfwMakeContextCurrent(window);
+    glfwSetKeyCallback(window, glfw_key_callback);
+    glfwSetScrollCallback(window, glfw_scroll_callback);
+    glfwSetCharCallback(window, glfw_char_callback);
 
-	glfwSetKeyCallback(window, glfw_key_callback);
-	glfwSetScrollCallback(window, glfw_scroll_callback);
-	glfwSetCharCallback(window, glfw_char_callback);
-
-	glewExperimental = GL_TRUE;
-	glewInit();
-
-	GLenum err = GL_NO_ERROR;
-	err = glGetError(); IM_ASSERT(err == GL_NO_ERROR);
+    glewInit();
 }
 
 void InitImGui()
 {
-	int w, h;
-	glfwGetWindowSize(window, &w, &h);
+    int w, h;
+    glfwGetWindowSize(window, &w, &h);
 
-	ImGuiIO& io = ImGui::GetIO();
-	io.DisplaySize = ImVec2((float)w, (float)h);			// Display size, in pixels. For clamping windows positions.
-	io.DeltaTime = 1.0f/60.0f;								// Time elapsed since last frame, in seconds (in this sample app we'll override this every frame because our timestep is variable)
-	io.PixelCenterOffset = 0.5f;							// Align OpenGL texels
-	io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;					// Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array that we will update during the application lifetime.
-	io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT;
-	io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT;
-	io.KeyMap[ImGuiKey_UpArrow] = GLFW_KEY_UP;
-	io.KeyMap[ImGuiKey_DownArrow] = GLFW_KEY_DOWN;
-	io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME;
-	io.KeyMap[ImGuiKey_End] = GLFW_KEY_END;
-	io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE;
-	io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE;
-	io.KeyMap[ImGuiKey_Enter] = GLFW_KEY_ENTER;
-	io.KeyMap[ImGuiKey_Escape] = GLFW_KEY_ESCAPE;
-	io.KeyMap[ImGuiKey_A] = GLFW_KEY_A;
-	io.KeyMap[ImGuiKey_C] = GLFW_KEY_C;
-	io.KeyMap[ImGuiKey_V] = GLFW_KEY_V;
-	io.KeyMap[ImGuiKey_X] = GLFW_KEY_X;
-	io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
-	io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2((float)w, (float)h);        // Display size, in pixels. For clamping windows positions.
+    io.DeltaTime = 1.0f/60.0f;                          // Time elapsed since last frame, in seconds (in this sample app we'll override this every frame because our timestep is variable)
+    io.PixelCenterOffset = 0.0f;                        // Align OpenGL texels
+    io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;             // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
+    io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT;
+    io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT;
+    io.KeyMap[ImGuiKey_UpArrow] = GLFW_KEY_UP;
+    io.KeyMap[ImGuiKey_DownArrow] = GLFW_KEY_DOWN;
+    io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME;
+    io.KeyMap[ImGuiKey_End] = GLFW_KEY_END;
+    io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE;
+    io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE;
+    io.KeyMap[ImGuiKey_Enter] = GLFW_KEY_ENTER;
+    io.KeyMap[ImGuiKey_Escape] = GLFW_KEY_ESCAPE;
+    io.KeyMap[ImGuiKey_A] = GLFW_KEY_A;
+    io.KeyMap[ImGuiKey_C] = GLFW_KEY_C;
+    io.KeyMap[ImGuiKey_V] = GLFW_KEY_V;
+    io.KeyMap[ImGuiKey_X] = GLFW_KEY_X;
+    io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
+    io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
 
-	io.RenderDrawListsFn = ImImpl_RenderDrawLists;
-	io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
-	io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
+    io.RenderDrawListsFn = ImImpl_RenderDrawLists;
+    io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
+    io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
 
-
-	// Setup graphics backend
-	GLint status = GL_TRUE;
-	GLenum err = GL_NO_ERROR;
-	err = glGetError(); IM_ASSERT(err == GL_NO_ERROR);
-
-	// Create and compile the vertex shader
-	vertexShader = glCreateShader(GL_VERTEX_SHADER);
-	glShaderSource(vertexShader, 1, &vertexSource, NULL);
-	glCompileShader(vertexShader);
-	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
-	if (status != GL_TRUE)
-	{
-		char buffer[512];
-		glGetShaderInfoLog(vertexShader, 1024, NULL, buffer);
-		printf("%s", buffer);
-		IM_ASSERT(status == GL_TRUE);
-	}
-
-	// Create and compile the fragment shader
-	fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
-	glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
-	glCompileShader(fragmentShader);
-	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
-	IM_ASSERT(status == GL_TRUE);
-
-	// Link the vertex and fragment shader into a shader program
-	shaderProgram = glCreateProgram();
-	glAttachShader(shaderProgram, vertexShader);
-	glAttachShader(shaderProgram, fragmentShader);
-	glBindFragDataLocation(shaderProgram, 0, "o_col");
-	glLinkProgram(shaderProgram);
-	glGetProgramiv(shaderProgram, GL_LINK_STATUS, &status);
-	IM_ASSERT(status == GL_TRUE);
-
-	uniMVP = glGetUniformLocation(shaderProgram, "MVP");
-	uniClipRect = glGetUniformLocation(shaderProgram, "ClipRect");
-
-	// Create Vertex Buffer Objects & Vertex Array Objects
-	glGenBuffers(1, &vbo);
-	glBindBuffer(GL_ARRAY_BUFFER, vbo);
-	glGenVertexArrays(1, &vao);
-	glBindVertexArray(vao);
-
-	GLint posAttrib = glGetAttribLocation(shaderProgram, "i_pos");
-	glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), 0);
-	glEnableVertexAttribArray(posAttrib);
-
-	GLint uvAttrib = glGetAttribLocation(shaderProgram, "i_uv");
-	glEnableVertexAttribArray(uvAttrib);
-	glVertexAttribPointer(uvAttrib, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (void*)(2*sizeof(float)));
-
-	GLint colAttrib = glGetAttribLocation(shaderProgram, "i_col");
-	glVertexAttribPointer(colAttrib, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (void*)(4*sizeof(float)));
-	glEnableVertexAttribArray(colAttrib);
-	err = glGetError(); IM_ASSERT(err == GL_NO_ERROR);
-
-	// Load font texture
-	glGenTextures(1, &fontTex);
-	glBindTexture(GL_TEXTURE_2D, fontTex);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-
-	const void* png_data;
-	unsigned int png_size;
-	ImGui::GetDefaultFontData(NULL, NULL, &png_data, &png_size);
-	int tex_x, tex_y, tex_comp;
-	void* tex_data = stbi_load_from_memory((const unsigned char*)png_data, (int)png_size, &tex_x, &tex_y, &tex_comp, 0);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_x, tex_y, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_data);
-	stbi_image_free(tex_data);
+    // Load font texture
+    glGenTextures(1, &fontTex);
+    glBindTexture(GL_TEXTURE_2D, fontTex);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    const void* png_data;
+    unsigned int png_size;
+    ImGui::GetDefaultFontData(NULL, NULL, &png_data, &png_size);
+    int tex_x, tex_y, tex_comp;
+    void* tex_data = stbi_load_from_memory((const unsigned char*)png_data, (int)png_size, &tex_x, &tex_y, &tex_comp, 0);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_x, tex_y, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_data);
+    stbi_image_free(tex_data);
 }
 
-void Shutdown()
+void UpdateImGui()
 {
-	ImGui::Shutdown();
+    ImGuiIO& io = ImGui::GetIO();
 
-    glDeleteProgram(shaderProgram);
-    glDeleteShader(fragmentShader);
-    glDeleteShader(vertexShader);
-    glDeleteBuffers(1, &vbo);
-    glDeleteVertexArrays(1, &vao);
+    // Setup timestep
+    static double time = 0.0f;
+    const double current_time =  glfwGetTime();
+    io.DeltaTime = (float)(current_time - time);
+    time = current_time;
 
-	glfwTerminate();
+    // Setup inputs
+    // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
+    double mouse_x, mouse_y;
+    glfwGetCursorPos(window, &mouse_x, &mouse_y);
+    io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);                           // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
+    io.MouseDown[0] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;
+    io.MouseDown[1] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_RIGHT) != 0;
+
+    // Start the frame
+    ImGui::NewFrame();
 }
 
+// Application code
 int main(int argc, char** argv)
 {
-	InitGL();
-	InitImGui();
+    InitGL();
+    InitImGui();
 
-	double time = glfwGetTime();
-	while (!glfwWindowShouldClose(window))
-	{
-		ImGuiIO& io = ImGui::GetIO();
-		glfwPollEvents();
+    while (!glfwWindowShouldClose(window))
+    {
+        ImGuiIO& io = ImGui::GetIO();
+        io.MouseWheel = 0;
+        glfwPollEvents();
+        UpdateImGui();
 
-		// 1) ImGui start frame, setup time delta & inputs
-		const double current_time =  glfwGetTime();
-		io.DeltaTime = (float)(current_time - time);
-		time = current_time;
-		double mouse_x, mouse_y;
-		glfwGetCursorPos(window, &mouse_x, &mouse_y);
-		io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);							// Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
-		io.MouseDown[0] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;
-		io.MouseDown[1] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_RIGHT) != 0;
-		io.MouseWheel = (mouse_wheel != 0) ? mouse_wheel > 0.0f ? 1 : - 1 : 0;			// Mouse wheel: -1,0,+1
-		mouse_wheel = 0.0f;
-		ImGui::NewFrame();
+        // Create a simple window
+        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
+        static bool show_test_window = true;
+        static bool show_another_window = false;
+        static float f;
+        ImGui::Text("Hello, world!");
+        ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+        show_test_window ^= ImGui::Button("Test Window");
+        show_another_window ^= ImGui::Button("Another Window");
 
-		// 2) ImGui usage
-		static bool show_test_window = true;
-		static bool show_another_window = false;
-		static float f;
-		ImGui::Text("Hello, world!");
-		ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
-		show_test_window ^= ImGui::Button("Test Window");
-		show_another_window ^= ImGui::Button("Another Window");
+        // Calculate and show framerate
+        static float ms_per_frame[120] = { 0 };
+        static int ms_per_frame_idx = 0;
+        static float ms_per_frame_accum = 0.0f;
+        ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
+        ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
+        ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
+        ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
+        const float ms_per_frame_avg = ms_per_frame_accum / 120;
+        ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
 
-		// Calculate and show framerate
-		static float ms_per_frame[120] = { 0 };
-		static int ms_per_frame_idx = 0;
-		static float ms_per_frame_accum = 0.0f;
-		ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
-		ms_per_frame[ms_per_frame_idx] = io.DeltaTime * 1000.0f;
-		ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
-		ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
-		const float ms_per_frame_avg = ms_per_frame_accum / 120;
-		ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
+        // Show the ImGui test window
+        // Most of user example code is in ImGui::ShowTestWindow()
+        if (show_test_window)
+        {
+            ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));        // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
+            ImGui::ShowTestWindow(&show_test_window);
+        }
 
-		if (show_test_window)
-		{
-			// More example code in ShowTestWindow()
-			ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));		// Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
-			ImGui::ShowTestWindow(&show_test_window);
-		}
+        // Show another simple window
+        if (show_another_window)
+        {
+            ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
+            ImGui::Text("Hello");
+            ImGui::End();
+        }
 
-		if (show_another_window)
-		{
-			ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
-			ImGui::Text("Hello");
-			ImGui::End();
-		}
-
-        // 3) Render
+        // Rendering
+        glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
         glClearColor(0.8f, 0.6f, 0.6f, 1.0f);
         glClear(GL_COLOR_BUFFER_BIT);
-		ImGui::Render();
+        ImGui::Render();
+        glfwSwapBuffers(window);
+    }
 
-		glfwSwapBuffers(window);
-	}
-
-	Shutdown();
-
-	return 0;
+    ImGui::Shutdown();
+    glfwTerminate();
+    return 0;
 }

extra_fonts/README.txt

@@ -0,0 +1,71 @@
+
+Extra fonts for ImGui.
+THOSE FONTS ARE OPTIONAL.
+
+ImGui embeds a copy of 'proggy_clean' that you can use without any external files.
+Export your own font with bmfont (www.angelcode.com/products/bmfont).
+
+bmfont reads fonts (.ttf, .fon, etc.) and output a .fnt file and a texture file, e.g:
+
+  proggy_clean.fon --> [bmfont] ---> proggy_clean_13.fnt
+                                     proggy_clean_13.png
+
+Configure bmfont:
+
+  - Export .fnt as Binary
+  - Tip: uncheck "Render from TrueType outline" and "Font Smoothing" for best result with non-anti-aliased type fonts. 
+    But you can experiment with other settings if you want anti-aliased fonts.
+
+
+(A) Use font data embedded in ImGui
+
+    // Access embedded font data
+    const void* fnt_data;   // pointer to FNT data
+    unsigned fnt_size;      // size of FNT data
+    const void* png_data;   // pointer to PNG data
+    unsigned int png_size;  // size of PNG data
+    ImGui::GetDefaultFontData(&fnt_data, &fnt_size, &png_data, &png_size);
+
+  1. Load the .FNT data from 'fnt_data' (NB: this is done for you by default if you don't do anything)
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.Font = new ImBitmapFont();
+    io.Font->LoadFromMemory(fnt_data, fnt_size);
+    
+  2. Load the .PNG data from 'png_data' into a texture
+
+
+
+(B) Use fonts from external files
+
+    ImGuiIO& io = ImGui::GetIO();
+
+  1. Load the .FNT data, e.g.
+    
+    // proggy_clean_13 [default]
+    io.Font->LoadFromFile("proggy_clean_13.fnt");
+    io.FontTexUvForWhite = ImVec2(0.0f/256.0f,0.0f/128);
+    io.FontYOffset = +1;
+
+    // proggy_small_12
+    io.Font = new ImBitmapFont();
+    io.Font->LoadFromFile("proggy_small_12.fnt");
+    io.FontTexUvForWhite = ImVec2(84.0f/256.0f,20.0f/64);
+    io.FontYOffset = +2;
+    
+    // proggy_small_14
+    io.Font = new ImBitmapFont();
+    io.Font->LoadFromFile("proggy_small_14.fnt");
+    io.FontTexUvForWhite = ImVec2(84.0f/256.0f,20.0f/64);
+    io.FontYOffset = +3;
+    
+    // courier_new_16
+    io.Font->LoadFromFile("courier_new_16.fnt");
+    io.FontTexUvForWhite = ImVec2(1.0f/256.0f,4.0f/128);
+    
+    // courier_new_18
+    io.Font->LoadFromFile("courier_new_18.fnt");
+    io.FontTexUvForWhite = ImVec2(4.0f/256.0f,5.0f/256);
+
+  2. Load the matching .PNG data into a texture
+

imconfig.h

@@ -4,31 +4,40 @@
 
 #pragma once
 
-//----- Define your own ImVector<> type if you don't want to use the provided implementation defined in imgui.h
+//---- Define your own malloc/free/realloc functions if you want to override internal memory allocations for ImGui
+//#define IM_MALLOC(_SIZE)			MyMalloc(_SIZE)			// void* MyMalloc(size_t size);
+//#define IM_FREE(_PTR)				MyFree(_PTR)			// void MyFree(void *ptr);
+//#define IM_REALLOC(_PTR, _SIZE)	MyRealloc(_PTR, _SIZE)	// void* MyRealloc(void *ptr, size_t size);
+
+//---- Define your own ImVector<> type if you don't want to use the provided implementation defined in imgui.h
 //#include <vector>
-//#define ImVector	std::vector
-//#define ImVector	MyVector
+//#define ImVector  std::vector
+//#define ImVector  MyVector
 
-//----- Define assertion handler. Default to calling assert().
-// #define IM_ASSERT(_EXPR)	MyAssert(_EXPR)
+//---- Define assertion handler. Defaults to calling assert().
+//#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
 
-//----- Define implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
+//---- Don't implement default clipboard handlers for Windows (so as not to link with OpenClipboard(), etc.)
+//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS
+
+//---- Define implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
 /*
-#define IM_VEC2_CLASS_EXTRA													\
-		ImVec2(const MyVec2& f) { x = f.x; y = f.y; }						\
-		operator MyVec2() const { return MyVec2(x,y); }
+#define IM_VEC2_CLASS_EXTRA                                                 \
+        ImVec2(const MyVec2& f) { x = f.x; y = f.y; }                       \
+        operator MyVec2() const { return MyVec2(x,y); }
 
-#define IM_VEC4_CLASS_EXTRA													\
-		ImVec4(const MyVec4& f) { x = f.x; y = f.y; z = f.z; w = f.w; }		\
-		operator MyVec4() const { return MyVec4(x,y,z,w); }
+#define IM_VEC4_CLASS_EXTRA                                                 \
+        ImVec4(const MyVec4& f) { x = f.x; y = f.y; z = f.z; w = f.w; }     \
+        operator MyVec4() const { return MyVec4(x,y,z,w); }
 */
 
-//----- Freely implement extra functions within the ImGui:: namespace.
-//----- e.g. you can create variants of the ImGui::Value() helper for your low-level math types.
+//---- Freely implement extra functions within the ImGui:: namespace.
+//---- e.g. you can create variants of the ImGui::Value() helper for your low-level math types.
 /*
 namespace ImGui
 {
-	void	Value(const char* prefix, cosnt MyVec2& v, const char* float_format = NULL);
-	void	Value(const char* prefix, cosnt MyVec4& v, const char* float_format = NULL);
+    void    Value(const char* prefix, const MyVec2& v, const char* float_format = NULL);
+    void    Value(const char* prefix, const MyVec4& v, const char* float_format = NULL);
 };
 */
+

stb_textedit.h

@@ -1,4 +1,4 @@
-// stb_textedit.h - v1.3  - public domain - Sean Barrett
+// stb_textedit.h - v1.4  - public domain - Sean Barrett
 // Development of this library was sponsored by RAD Game Tools
 //
 // This C header file implements the guts of a multi-line text-editing
@@ -30,8 +30,9 @@
 //
 // VERSION HISTORY
 //
-//   1.3  (2013-06-19) fix mouse clicking to round to nearest char boundary
-//   1.2  (2013-05-27) fix some RAD types that had crept into the new code
+//   1.4  (2014-08-17) fix signed/unsigned warnings
+//   1.3  (2014-06-19) fix mouse clicking to round to nearest char boundary
+//   1.2  (2014-05-27) fix some RAD types that had crept into the new code
 //   1.1  (2013-12-15) move-by-word (requires STB_TEXTEDIT_IS_SPACE )
 //   1.0  (2012-07-26) improve documentation, initial public release
 //   0.3  (2012-02-24) bugfixes, single-line mode; insert mode
@@ -41,7 +42,7 @@
 // ADDITIONAL CONTRIBUTORS
 //
 //   Ulf Winklemann: move-by-word in 1.1
-//   Scott Graham: mouse selectiom bugfix in 1.3
+//   Scott Graham: mouse selection bugfix in 1.3
 //
 // USAGE
 //
@@ -445,7 +446,7 @@ static void stb_textedit_drag(STB_TEXTEDIT_STRING *str, STB_TexteditState *state
 static void stb_text_undo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state);
 static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state);
 static void stb_text_makeundo_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length);
-static void stb_text_makeundo_insert(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length);
+static void stb_text_makeundo_insert(STB_TexteditState *state, int where, int length);
 static void stb_text_makeundo_replace(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int old_length, int new_length);
 
 typedef struct
@@ -649,7 +650,7 @@ static int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state
    stb_textedit_delete_selection(str,state);
    // try to insert the characters
    if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, len)) {
-      stb_text_makeundo_insert(str, state, state->cursor, len);
+      stb_text_makeundo_insert(state, state->cursor, len);
       state->cursor += len;
       state->has_preferred_x = 0;
       return 1;
@@ -684,7 +685,7 @@ retry:
             } else {
                stb_textedit_delete_selection(str,state); // implicity clamps
                if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
-                  stb_text_makeundo_insert(str, state, state->cursor, 1);
+                  stb_text_makeundo_insert(state, state->cursor, 1);
                   ++state->cursor;
                   state->has_preferred_x = 0;
                }
@@ -1007,13 +1008,13 @@ static void stb_textedit_discard_undo(StbUndoState *state)
          int n = state->undo_rec[0].insert_length, i;
          // delete n characters from all other records
          state->undo_char_point = state->undo_char_point - (short) n;  // vsnet05
-         memmove(state->undo_char, state->undo_char + n, state->undo_char_point*sizeof(STB_TEXTEDIT_CHARTYPE));
+         memmove(state->undo_char, state->undo_char + n, (size_t) (state->undo_char_point*sizeof(STB_TEXTEDIT_CHARTYPE)));
          for (i=0; i < state->undo_point; ++i)
             if (state->undo_rec[i].char_storage >= 0)
                state->undo_rec[i].char_storage = state->undo_rec[i].char_storage - (short) n; // vsnet05 // @OPTIMIZE: get rid of char_storage and infer it
       }
       --state->undo_point;
-      memmove(state->undo_rec, state->undo_rec+1, state->undo_point*sizeof(state->undo_rec[0]));
+      memmove(state->undo_rec, state->undo_rec+1, (size_t) (state->undo_point*sizeof(state->undo_rec[0])));
    }
 }
 
@@ -1031,13 +1032,13 @@ static void stb_textedit_discard_redo(StbUndoState *state)
          int n = state->undo_rec[k].insert_length, i;
          // delete n characters from all other records
          state->redo_char_point = state->redo_char_point + (short) n; // vsnet05
-         memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE));
+         memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (size_t) ((STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE)));
          for (i=state->redo_point; i < k; ++i)
             if (state->undo_rec[i].char_storage >= 0)
                state->undo_rec[i].char_storage = state->undo_rec[i].char_storage + (short) n; // vsnet05
       }
       ++state->redo_point;
-      memmove(state->undo_rec + state->redo_point-1, state->undo_rec + state->redo_point, (STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0]));
+      memmove(state->undo_rec + state->redo_point-1, state->undo_rec + state->redo_point, (size_t) ((STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0])));
    }
 }
 
@@ -1203,7 +1204,7 @@ static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
    s->redo_point++;
 }
 
-static void stb_text_makeundo_insert(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length)
+static void stb_text_makeundo_insert(STB_TexteditState *state, int where, int length)
 {
    stb_text_createundo(&state->undostate, where, 0, length);
 }