Created demo using Win32 GDI rendering. Uses VS2015 for compiler.

.gitignore

@@ -0,0 +1,2 @@
+demo/gdi/*.exe
+demo/gdi/*.obj

demo/gdi/build.bat

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+@echo off
+
+rem This will use VS2015 for compiler
+call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
+
+cl /nologo /W3 /WX /O2 /fp:fast /Gm- /Fedemo.exe main.c user32.lib gdi32.lib /link /incremental:no

demo/gdi/main.c

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+/* nuklear - v1.00 - public domain */
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <stdio.h>
+#include <string.h>
+
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#include "nuklear_gdi.h"
+#include "nuklear_gdi.c"
+
+static LRESULT CALLBACK
+WindowProc(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
+{
+    switch (msg)
+    {
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        return 0;
+    }
+
+    if (nk_gdi_handle_event(wnd, msg, wparam, lparam))
+        return 0;
+
+    return DefWindowProcW(wnd, msg, wparam, lparam);
+}
+
+int main(void)
+{
+    GdiFont* font;
+    struct nk_context *ctx;
+
+    WNDCLASSW wc;
+    ATOM atom;
+    RECT rect = { 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT };
+    DWORD style = WS_OVERLAPPEDWINDOW;
+    DWORD exstyle = WS_EX_APPWINDOW;
+    HWND wnd;
+    HDC dc;
+    int running = 1;
+    int needs_refresh = 1;
+
+    /* Win32 */
+    memset(&wc, 0, sizeof(wc));
+    wc.lpfnWndProc = WindowProc;
+    wc.hInstance = GetModuleHandleW(0);
+    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+    wc.lpszClassName = L"NuklearWindowClass";
+    atom = RegisterClassW(&wc);
+
+    AdjustWindowRectEx(&rect, style, FALSE, exstyle);
+
+    wnd = CreateWindowExW(exstyle, wc.lpszClassName, L"Nuklear Demo",
+        style | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT,
+        rect.right - rect.left, rect.bottom - rect.top,
+        NULL, NULL, wc.hInstance, NULL);
+    dc = GetDC(wnd);
+
+    /* GUI */
+    font = nk_gdifont_create("Arial", 14);
+    ctx = nk_gdi_init(font, dc, WINDOW_WIDTH, WINDOW_HEIGHT);
+    while (running)
+    {
+        MSG msg;
+
+        /* Input */
+        nk_input_begin(ctx);
+        if (needs_refresh == 0)
+        {
+            if (GetMessageW(&msg, NULL, 0, 0) <= 0)
+            {
+                running = 0;
+            }
+            else
+            {
+                TranslateMessage(&msg);
+                DispatchMessageW(&msg);
+            }
+            needs_refresh = 1;
+        }
+        else
+        {
+            needs_refresh = 0;
+        }
+        while (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE))
+        {
+            if (msg.message == WM_QUIT)
+                running = 0;
+            TranslateMessage(&msg);
+            DispatchMessageW(&msg);
+            needs_refresh = 1;
+        }
+        nk_input_end(ctx);
+
+        /* GUI */
+        {struct nk_panel layout;
+        if (nk_begin(ctx, &layout, "Demo", nk_rect(50, 50, 200, 200),
+            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
+            NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
+        {
+            enum {EASY, HARD};
+            static int op = EASY;
+            static int property = 20;
+
+            nk_layout_row_static(ctx, 30, 80, 1);
+            if (nk_button_label(ctx, "button", NK_BUTTON_DEFAULT))
+                fprintf(stdout, "button pressed\n");
+            nk_layout_row_dynamic(ctx, 30, 2);
+            if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
+            if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
+            nk_layout_row_dynamic(ctx, 22, 1);
+            nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
+        }
+        nk_end(ctx);}
+        if (nk_window_is_closed(ctx, "Demo")) break;
+
+        /* Draw */
+        nk_gdi_render(nk_rgb(30,30,30));
+    }
+
+    nk_gdifont_del(font);
+    ReleaseDC(wnd, dc);
+    UnregisterClassW(wc.lpszClassName, wc.hInstance);
+    return 0;
+}
+

demo/gdi/nuklear_gdi.c

@@ -0,0 +1,714 @@
+#include <stdlib.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <malloc.h>
+
+#define NK_IMPLEMENTATION
+#include "nuklear_gdi.h"
+#include "../../nuklear.h"
+
+struct GdiFont {
+    int height;
+    HFONT handle;
+    HDC dc;
+};
+
+static struct {
+    HBITMAP bitmap;
+    HDC window_dc;
+    HDC memory_dc;
+    unsigned int width;
+    unsigned int height;
+    struct nk_context ctx;
+} gdi;
+
+static COLORREF convert_color(struct nk_color c)
+{
+    return c.r | (c.g << 8) | (c.b << 16);
+}
+
+static void
+nk_gdi_scissor(HDC dc, float x, float y, float w, float h)
+{
+    SelectClipRgn(dc, NULL);
+    IntersectClipRect(dc, (int)x, (int)y, (int)(x + w + 1), (int)(y + h + 1));
+}
+
+static void
+nk_gdi_stroke_line(HDC dc, short x0, short y0, short x1,
+    short y1, unsigned int line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    } else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    MoveToEx(dc, x0, y0, NULL);
+    LineTo(dc, x1, y1);
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_stroke_rect(HDC dc, short x, short y, unsigned short w,
+    unsigned short h, unsigned short r, unsigned short line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    } else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    SetDCBrushColor(dc, OPAQUE);
+    if (r == 0) {
+        Rectangle(dc, x, y, x + w, y + h);
+    } else {
+        RoundRect(dc, x, y, x + w, y + h, r, r);
+    }
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_fill_rect(HDC dc, short x, short y, unsigned short w,
+    unsigned short h, unsigned short r, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+
+    if (r == 0) {
+        RECT rect = { x, y, x + w, y + h };
+        SetBkColor(dc, color);
+        ExtTextOutW(dc, 0, 0, ETO_OPAQUE, &rect, NULL, 0, NULL);
+    } else {
+        SetDCPenColor(dc, color);
+        SetDCBrushColor(dc, color);
+        RoundRect(dc, x, y, x + w, y + h, r, r);
+    }
+}
+
+static void
+nk_gdi_fill_triangle(HDC dc, short x0, short y0, short x1,
+    short y1, short x2, short y2, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    POINT points[] = {
+        { x0, y0 },
+        { x1, y1 },
+        { x2, y2 },
+    };
+
+    SetDCPenColor(dc, color);
+    SetDCBrushColor(dc, color);
+    Polygon(dc, points, 3);
+}
+
+static void
+nk_gdi_stroke_triangle(HDC dc, short x0, short y0, short x1,
+    short y1, short x2, short y2, unsigned short line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    POINT points[] = {
+        { x0, y0 },
+        { x1, y1 },
+        { x2, y2 },
+        { x0, y0 },
+    };
+
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    } else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    Polyline(dc, points, 4);
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_fill_polygon(HDC dc, const struct nk_vec2i *pnts, int count, struct nk_color col)
+{
+    int i = 0;
+    #define MAX_POINTS 64
+    POINT points[MAX_POINTS];
+    COLORREF color = convert_color(col);
+    SetDCBrushColor(dc, color);
+    SetDCPenColor(dc, color);
+    for (i = 0; i < count && i < MAX_POINTS; ++i) {
+        points[i].x = pnts[i].x;
+        points[i].y = pnts[i].y;
+    }
+    Polygon(dc, points, i);
+    #undef MAX_POINTS
+}
+
+static void
+nk_gdi_stroke_polygon(HDC dc, const struct nk_vec2i *pnts, int count,
+    unsigned short line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    } else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    if (count > 0) {
+        int i;
+        MoveToEx(dc, pnts[0].x, pnts[0].y, NULL);
+        for (i = 1; i < count; ++i)
+            LineTo(dc, pnts[i].x, pnts[i].y);
+        LineTo(dc, pnts[0].x, pnts[0].y);
+    }
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_stroke_polyline(HDC dc, const struct nk_vec2i *pnts,
+    int count, unsigned short line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    } else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    if (count > 0) {
+        int i;
+        MoveToEx(dc, pnts[0].x, pnts[0].y, NULL);
+        for (i = 1; i < count; ++i)
+            LineTo(dc, pnts[i].x, pnts[i].y);
+    }
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_fill_circle(HDC dc, short x, short y, unsigned short w,
+    unsigned short h, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    SetDCBrushColor(dc, color);
+    SetDCPenColor(dc, color);
+    Ellipse(dc, x, y, x + w, y + h);
+}
+
+static void
+nk_gdi_stroke_circle(HDC dc, short x, short y, unsigned short w,
+    unsigned short h, unsigned short line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    } else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    SetDCBrushColor(dc, OPAQUE);
+    Ellipse(dc, x, y, x + w, y + h);
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_stroke_curve(HDC dc, struct nk_vec2i p1,
+    struct nk_vec2i p2, struct nk_vec2i p3, struct nk_vec2i p4,
+    unsigned short line_thickness, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    POINT p[] = {
+        { p1.x, p1.y },
+        { p2.x, p2.y },
+        { p3.x, p3.y },
+        { p4.x, p4.y },
+    };
+
+    HPEN pen = NULL;
+    if (line_thickness == 1) {
+        SetDCPenColor(dc, color);
+    }
+    else {
+        pen = CreatePen(PS_SOLID, line_thickness, color);
+        SelectObject(dc, pen);
+    }
+
+    SetDCBrushColor(dc, OPAQUE);
+    PolyBezier(dc, p, 4);
+
+    if (pen) {
+        SelectObject(dc, GetStockObject(DC_PEN));
+        DeleteObject(pen);
+    }
+}
+
+static void
+nk_gdi_draw_text(HDC dc, short x, short y, unsigned short w, unsigned short h,
+    const char *text, int len, GdiFont *font, struct nk_color cbg, struct nk_color cfg)
+{
+    int wsize;
+    WCHAR* wstr;
+
+    if(!text || !font || !len) return;
+
+    wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
+    wstr = _alloca(wsize * sizeof(wchar_t));
+    MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);
+
+    SetBkColor(dc, convert_color(cbg));
+    SetTextColor(dc, convert_color(cfg));
+
+    SelectObject(dc, font->handle);
+    ExtTextOutW(dc, x, y, ETO_OPAQUE, NULL, wstr, wsize, NULL);
+}
+
+static void
+nk_gdi_clear(HDC dc, struct nk_color col)
+{
+    COLORREF color = convert_color(col);
+    RECT rect = { 0, 0, gdi.width, gdi.height };
+    SetBkColor(dc, color);
+
+    ExtTextOutW(dc, 0, 0, ETO_OPAQUE, &rect, NULL, 0, NULL);
+}
+
+static void
+nk_gdi_blit(HDC dc)
+{
+    BitBlt(dc, 0, 0, gdi.width, gdi.height, gdi.memory_dc, 0, 0, SRCCOPY);
+}
+
+GdiFont*
+nk_gdifont_create(const char *name, int size)
+{
+    TEXTMETRICW metric;
+    GdiFont *font = (GdiFont*)calloc(1, sizeof(GdiFont));
+    if (!font)
+        return NULL;
+    font->dc = CreateCompatibleDC(0);
+    font->handle = CreateFont(size, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, CLEARTYPE_QUALITY, DEFAULT_PITCH | FF_DONTCARE, name);
+    SelectObject(font->dc, font->handle);
+    GetTextMetricsW(font->dc, &metric);
+    font->height = metric.tmHeight;
+    return font;
+}
+
+static float
+nk_gdifont_get_text_width(nk_handle handle, float height, const char *text, int len)
+{
+    GdiFont *font = (GdiFont*)handle.ptr;
+    SIZE size;
+    int wsize;
+    WCHAR* wstr;
+    if (!font || !text)
+        return 0;
+
+    wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
+    wstr = _alloca(wsize * sizeof(wchar_t));
+    MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);
+    if (GetTextExtentPoint32W(font->dc, wstr, wsize, &size))
+        return (float)size.cx;
+    return -1.0f;
+}
+
+void
+nk_gdifont_del(GdiFont *font)
+{
+    if(!font) return;
+    DeleteObject(font->handle);
+    DeleteDC(font->dc);
+    free(font);
+}
+
+static void
+nk_gdi_clipbard_paste(nk_handle usr, struct nk_text_edit *edit)
+{
+    (void)usr;
+    if (IsClipboardFormatAvailable(CF_UNICODETEXT) && OpenClipboard(NULL))
+    {
+        HGLOBAL mem = GetClipboardData(CF_UNICODETEXT); 
+        if (mem)
+        {
+            SIZE_T size = GlobalSize(mem) - 1;
+            if (size)
+            {
+                LPCWSTR wstr = (LPCWSTR)GlobalLock(mem); 
+                if (wstr) 
+                {
+                    int utf8size = WideCharToMultiByte(CP_UTF8, 0, wstr, (int)(size / sizeof(wchar_t)), NULL, 0, NULL, NULL);
+                    if (utf8size)
+                    {
+                        char* utf8 = malloc(utf8size);
+                        if (utf8)
+                        {
+                            WideCharToMultiByte(CP_UTF8, 0, wstr, (int)(size / sizeof(wchar_t)), utf8, utf8size, NULL, NULL);
+                            nk_textedit_paste(edit, utf8, utf8size);
+                            free(utf8);
+                        }
+                        GlobalUnlock(mem); 
+                    }
+                }
+            }
+        }
+        CloseClipboard();
+    }
+}
+
+static void
+nk_gdi_clipbard_copy(nk_handle usr, const char *text, int len)
+{
+    if (OpenClipboard(NULL))
+    {
+        int wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
+        if (wsize)
+        {
+            HGLOBAL mem = GlobalAlloc(GMEM_MOVEABLE, (wsize + 1) * sizeof(wchar_t));
+            if (mem)
+            {
+                wchar_t* wstr = GlobalLock(mem);
+                if (wstr)
+                {
+                    MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);
+                    wstr[wsize] = 0;
+                    GlobalUnlock(mem); 
+
+                    SetClipboardData(CF_UNICODETEXT, mem); 
+                }
+            }
+        }
+        CloseClipboard();
+    }
+}
+
+NK_API struct nk_context*
+nk_gdi_init(GdiFont *gdifont, HDC window_dc, unsigned int width, unsigned int height)
+{
+    struct nk_user_font font;
+    font.userdata = nk_handle_ptr(gdifont);
+    font.height = (float)gdifont->height;
+    font.width = nk_gdifont_get_text_width;
+
+    gdi.bitmap = CreateCompatibleBitmap(window_dc, width, height);
+    gdi.window_dc = window_dc;
+    gdi.memory_dc = CreateCompatibleDC(window_dc);
+    gdi.width = width;
+    gdi.height = height;
+    SelectObject(gdi.memory_dc, gdi.bitmap);
+
+    nk_init_default(&gdi.ctx, &font);
+    gdi.ctx.clip.copy = nk_gdi_clipbard_copy;
+    gdi.ctx.clip.paste = nk_gdi_clipbard_paste;
+    return &gdi.ctx;
+}
+
+NK_API void
+nk_gdi_set_font(GdiFont *gdifont)
+{
+    struct nk_user_font font;
+    font.userdata = nk_handle_ptr(gdifont);
+    font.height = (float)gdifont->height;
+    font.width = nk_gdifont_get_text_width;
+    nk_style_set_font(&gdi.ctx, &font);
+}
+
+NK_API int
+nk_gdi_handle_event(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
+{
+    switch (msg)
+    {
+    case WM_SIZE:
+    {
+        unsigned width = LOWORD(lparam);
+        unsigned height = LOWORD(lparam);
+        if (width != gdi.width || height != gdi.height)
+        {
+            DeleteObject(gdi.bitmap);
+            gdi.bitmap = CreateCompatibleBitmap(gdi.window_dc, width, height);
+            gdi.width = width;
+            gdi.height = height;
+            SelectObject(gdi.memory_dc, gdi.bitmap);
+        }
+        break;
+    }
+
+    case WM_PAINT:
+    {
+        PAINTSTRUCT paint;
+        HDC dc = BeginPaint(wnd, &paint);
+        nk_gdi_blit(dc);
+        EndPaint(wnd, &paint);
+        return 1;
+    }
+
+    case WM_KEYDOWN:
+    case WM_KEYUP:
+    case WM_SYSKEYDOWN:
+    case WM_SYSKEYUP:
+    {
+        int down = (lparam >> 31) & 1;
+        int ctrl = GetKeyState(VK_CONTROL) & (1 << 15);
+
+        switch (wparam)
+        {
+        case VK_SHIFT:
+        case VK_LSHIFT:
+        case VK_RSHIFT:
+            nk_input_key(&gdi.ctx, NK_KEY_SHIFT, down);
+            return 1;
+
+        case VK_DELETE:
+            nk_input_key(&gdi.ctx, NK_KEY_DEL, down);
+            return 1;
+
+        case VK_RETURN:
+            nk_input_key(&gdi.ctx, NK_KEY_ENTER, down);
+            return 1;
+
+        case VK_TAB:
+            nk_input_key(&gdi.ctx, NK_KEY_TAB, down);
+            return 1;
+
+        case VK_LEFT:
+            if (ctrl)
+                nk_input_key(&gdi.ctx, NK_KEY_TEXT_WORD_LEFT, down);
+            else
+                nk_input_key(&gdi.ctx, NK_KEY_LEFT, down);
+            return 1;
+
+        case VK_RIGHT:
+            if (ctrl)
+                nk_input_key(&gdi.ctx, NK_KEY_TEXT_WORD_RIGHT, down);
+            else
+                nk_input_key(&gdi.ctx, NK_KEY_RIGHT, down);
+            return 1;
+
+        case VK_BACK:
+            nk_input_key(&gdi.ctx, NK_KEY_BACKSPACE, down);
+            return 1;
+
+        case VK_HOME:
+            nk_input_key(&gdi.ctx, NK_KEY_TEXT_START, down);
+            return 1;
+
+        case VK_END:
+            nk_input_key(&gdi.ctx, NK_KEY_TEXT_END, down);
+            return 1;
+
+        case 'C':
+            if (ctrl) {
+                nk_input_key(&gdi.ctx, NK_KEY_COPY, down);
+                return 1;
+            }
+            break;
+
+        case 'V':
+            if (ctrl) {
+                nk_input_key(&gdi.ctx, NK_KEY_PASTE, down);
+                return 1;
+            }
+            break;
+
+        case 'X':
+            if (ctrl) {
+                nk_input_key(&gdi.ctx, NK_KEY_CUT, down);
+                return 1;
+            }
+            break;
+
+        case 'Z':
+            if (ctrl) {
+                nk_input_key(&gdi.ctx, NK_KEY_TEXT_UNDO, down);
+                return 1;
+            }
+            break;
+
+        case 'R':
+            if (ctrl) {
+                nk_input_key(&gdi.ctx, NK_KEY_TEXT_REDO, down);
+                return 1;
+            }
+            break;
+        }
+        return 0;
+    }
+
+    case WM_CHAR:
+        if (wparam >= 32)
+        {
+            nk_input_unicode(&gdi.ctx, (nk_rune)wparam);
+            return 1;
+        }
+        break;
+
+    case WM_LBUTTONDOWN:
+        nk_input_button(&gdi.ctx, NK_BUTTON_LEFT, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
+        SetCapture(wnd);
+        return 1;
+
+    case WM_LBUTTONUP:
+        nk_input_button(&gdi.ctx, NK_BUTTON_LEFT, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
+        ReleaseCapture();
+        return 1;
+
+    case WM_RBUTTONDOWN:
+        nk_input_button(&gdi.ctx, NK_BUTTON_RIGHT, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
+        SetCapture(wnd);
+        return 1;
+
+    case WM_RBUTTONUP:
+        nk_input_button(&gdi.ctx, NK_BUTTON_RIGHT, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
+        ReleaseCapture();
+        return 1;
+
+    case WM_MBUTTONDOWN:
+        nk_input_button(&gdi.ctx, NK_BUTTON_MIDDLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
+        SetCapture(wnd);
+        return 1;
+
+    case WM_MBUTTONUP:
+        nk_input_button(&gdi.ctx, NK_BUTTON_MIDDLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
+        ReleaseCapture();
+        return 1;
+
+    case WM_MOUSEWHEEL:
+        nk_input_scroll(&gdi.ctx, (float)(short)HIWORD(wparam) / WHEEL_DELTA);
+        return 1;
+
+    case WM_MOUSEMOVE:
+        nk_input_motion(&gdi.ctx, (short)LOWORD(lparam), (short)HIWORD(lparam));
+        return 1;
+    }
+
+    return 0;
+}
+
+NK_API void
+nk_gdi_shutdown(void)
+{
+    DeleteObject(gdi.memory_dc);
+    DeleteObject(gdi.bitmap);
+    nk_free(&gdi.ctx);
+}
+
+NK_API void
+nk_gdi_render(struct nk_color clear)
+{
+    const struct nk_command *cmd;
+
+    HDC memory_dc = gdi.memory_dc;
+    SelectObject(memory_dc, GetStockObject(DC_PEN));
+    SelectObject(memory_dc, GetStockObject(DC_BRUSH));
+    nk_gdi_clear(memory_dc, clear);
+
+    nk_foreach(cmd, &gdi.ctx)
+    {
+        switch (cmd->type) {
+        case NK_COMMAND_NOP: break;
+        case NK_COMMAND_SCISSOR: {
+            const struct nk_command_scissor *s =(const struct nk_command_scissor*)cmd;
+            nk_gdi_scissor(memory_dc, s->x, s->y, s->w, s->h);
+        } break;
+        case NK_COMMAND_LINE: {
+            const struct nk_command_line *l = (const struct nk_command_line *)cmd;
+            nk_gdi_stroke_line(memory_dc, l->begin.x, l->begin.y, l->end.x,
+                l->end.y, l->line_thickness, l->color);
+        } break;
+        case NK_COMMAND_RECT: {
+            const struct nk_command_rect *r = (const struct nk_command_rect *)cmd;
+            nk_gdi_stroke_rect(memory_dc, r->x, r->y, r->w, r->h,
+                (unsigned short)r->rounding, r->line_thickness, r->color);
+        } break;
+        case NK_COMMAND_RECT_FILLED: {
+            const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd;
+            nk_gdi_fill_rect(memory_dc, r->x, r->y, r->w, r->h,
+                (unsigned short)r->rounding, r->color);
+        } break;
+        case NK_COMMAND_CIRCLE: {
+            const struct nk_command_circle *c = (const struct nk_command_circle *)cmd;
+            nk_gdi_stroke_circle(memory_dc, c->x, c->y, c->w, c->h, c->line_thickness, c->color);
+        } break;
+        case NK_COMMAND_CIRCLE_FILLED: {
+            const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
+            nk_gdi_fill_circle(memory_dc, c->x, c->y, c->w, c->h, c->color);
+        } break;
+        case NK_COMMAND_TRIANGLE: {
+            const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd;
+            nk_gdi_stroke_triangle(memory_dc, t->a.x, t->a.y, t->b.x, t->b.y,
+                t->c.x, t->c.y, t->line_thickness, t->color);
+        } break;
+        case NK_COMMAND_TRIANGLE_FILLED: {
+            const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd;
+            nk_gdi_fill_triangle(memory_dc, t->a.x, t->a.y, t->b.x, t->b.y,
+                t->c.x, t->c.y, t->color);
+        } break;
+        case NK_COMMAND_POLYGON: {
+            const struct nk_command_polygon *p =(const struct nk_command_polygon*)cmd;
+            nk_gdi_stroke_polygon(memory_dc, p->points, p->point_count, p->line_thickness,p->color);
+        } break;
+        case NK_COMMAND_POLYGON_FILLED: {
+            const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd;
+            nk_gdi_fill_polygon(memory_dc, p->points, p->point_count, p->color);
+        } break;
+        case NK_COMMAND_POLYLINE: {
+            const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd;
+            nk_gdi_stroke_polyline(memory_dc, p->points, p->point_count, p->line_thickness, p->color);
+        } break;
+        case NK_COMMAND_TEXT: {
+            const struct nk_command_text *t = (const struct nk_command_text*)cmd;
+            nk_gdi_draw_text(memory_dc, t->x, t->y, t->w, t->h,
+                (const char*)t->string, t->length,
+                (GdiFont*)t->font->userdata.ptr,
+                t->background, t->foreground);
+        } break;
+        case NK_COMMAND_CURVE: {
+            const struct nk_command_curve *q = (const struct nk_command_curve *)cmd;
+            nk_gdi_stroke_curve(memory_dc, q->begin, q->ctrl[0], q->ctrl[1],
+                q->end, q->line_thickness, q->color);
+        } break;
+        case NK_COMMAND_RECT_MULTI_COLOR:
+        case NK_COMMAND_IMAGE:
+        case NK_COMMAND_ARC:
+        case NK_COMMAND_ARC_FILLED:
+        default: break;
+        }
+    }
+    nk_gdi_blit(gdi.window_dc);
+    nk_clear(&gdi.ctx);
+}

demo/gdi/nuklear_gdi.h

@@ -0,0 +1,18 @@
+#ifndef NK_GDI_H_
+#define NK_GDI_H_
+
+#include "../../nuklear.h"
+
+typedef struct GdiFont GdiFont;
+
+NK_API struct nk_context* nk_gdi_init(GdiFont *font, HDC window_dc, unsigned int width, unsigned int height);
+NK_API void nk_gdi_set_font(GdiFont *font);
+NK_API int nk_gdi_handle_event(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
+NK_API void nk_gdi_render(struct nk_color clear);
+NK_API void nk_gdi_shutdown(void);
+
+/* font */
+NK_API GdiFont* nk_gdifont_create(const char *name, int size);
+NK_API void nk_gdifont_del(GdiFont *font);
+
+#endif