summaryrefslogtreecommitdiff
path: root/src/render/graphics.cpp
blob: 78965afc939dcb6def361e572ae9ef6cc9b9e91e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
/*
 *  The ManaPlus Client
 *  Copyright (C) 2004-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2016  The ManaPlus Developers
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
 *
 *
 * Per Larsson a.k.a finalman
 * Olof Naessén a.k.a jansem/yakslem
 *
 * Visit: http://guichan.sourceforge.net
 *
 * License: (BSD)
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Guichan nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "render/graphics.h"

#ifdef USE_OPENGL
#include "configuration.h"
#include "graphicsmanager.h"
#endif

#if defined(USE_OPENGL) && defined(USE_X11)
#include "render/openglx/mglxinit.h"
#endif

#ifdef USE_OPENGL
#include "resources/openglimagehelper.h"
#ifndef ANDROID
#include "resources/safeopenglimagehelper.h"
#endif  // ANDROID
#ifdef __native_client__
#include "render/nacl/naclfunctions.h"
#include "render/nacl/naclgles.h"
#endif  // __native_client__
#else  // USE_OPENGL
#ifndef USE_SDL2
#include "resources/imagehelper.h"
#endif  // USE_SDL2
#endif  // USE_OPENGL

#ifdef USE_OPENGL
#ifdef __APPLE__
#include <OpenGL/OpenGL.h>
#endif  // __APPLE__
#ifndef USE_SDL2
#include "render/opengl/mgldefines.h"
#endif  // USE_SDL2
#endif  // USE_OPENGL

#include "debug.h"

#ifdef USE_OPENGL
#ifndef GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX
#define GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX 0x9049
#endif
#endif

Graphics *mainGraphics A_NONNULLPOINTER = nullptr;

Graphics::Graphics() :
    mWidth(0),
    mHeight(0),
    mActualWidth(0),
    mActualHeight(0),
    mClipStack(1000),
    mWindow(nullptr),
#ifdef USE_SDL2
    mRenderer(nullptr),
#endif
#ifdef USE_OPENGL
    mGLContext(nullptr),
#endif
    mBpp(0),
    mAlpha(false),
    mFullscreen(false),
    mHWAccel(false),
    mRedraw(false),
    mDoubleBuffer(false),
    mRect(),
    mSecure(false),
    mOpenGL(RENDER_SOFTWARE),
    mEnableResize(false),
    mNoFrame(false),
    mName("Unknown"),
    mStartFreeMem(0),
    mSync(false),
    mScale(1),
    mColor()
{
    mRect.x = 0;
    mRect.y = 0;
    mRect.w = 0;
    mRect.h = 0;
}

Graphics::~Graphics()
{
    endDraw();
#ifdef USE_SDL2
    if (mRenderer)
    {
        SDL_DestroyRenderer(mRenderer);
        mRenderer = nullptr;
    }
#ifdef USE_OPENGL
    if (mGLContext)
    {
        SDL_GL_DeleteContext(mGLContext);
        mGLContext = nullptr;
    }
#endif
#endif
}

void Graphics::setSync(const bool sync) restrict2
{
    mSync = sync;
}

void Graphics::setMainFlags(const int w, const int h,
                            const int scale,
                            const int bpp,
                            const bool fs,
                            const bool hwaccel,
                            const bool resize,
                            const bool noFrame) restrict2
{
    logger->log("graphics backend: %s", getName().c_str());
    logger->log("Setting video mode %dx%d %s",
            w, h, fs ? "fullscreen" : "windowed");

    mBpp = bpp;
    mFullscreen = fs;
    mHWAccel = hwaccel;
    mEnableResize = resize;
    mNoFrame = noFrame;
    mActualWidth = w;
    mActualHeight = h;
    setScale(scale);
}

void Graphics::setScale(int scale) restrict2
{
    if (isAllowScale())
    {
        if (!scale)
            scale = 1;
        int scaleW = mActualWidth / scale;
        int scaleH = mActualHeight / scale;
        if (scaleW < 470)
        {
            scale = mActualWidth / 470;
            if (scale < 1)
                scale = 1;
            scaleH = mActualHeight / scale;
        }
        if (scaleH < 320)
        {
            scale = mActualHeight / 320;
            if (scale < 1)
                scale = 1;
        }
        logger->log("set scale: %d", scale);
        mScale = scale;
        mWidth = mActualWidth / mScale;
        mHeight = mActualHeight / mScale;
    }
    else
    {
        mScale = 1;
        mWidth = mActualWidth;
        mHeight = mActualHeight;
    }
    mRect.w = static_cast<RectSize>(mWidth);
    mRect.h = static_cast<RectSize>(mHeight);
}

int Graphics::getOpenGLFlags() const restrict2
{
#ifdef USE_OPENGL

#ifdef USE_SDL2
    int displayFlags = SDL_WINDOW_OPENGL;
    if (mFullscreen)
        displayFlags |= SDL_WINDOW_FULLSCREEN;
#else
    int displayFlags = SDL_ANYFORMAT | SDL_OPENGL;
#endif  // USE_SDL2

    if (mFullscreen)
    {
        displayFlags |= SDL_FULLSCREEN;
    }
    else
    {
        // Resizing currently not supported on Windows, where it would require
        // reuploading all textures.
#if !defined(_WIN32)
        if (mEnableResize)
            displayFlags |= SDL_RESIZABLE;
#endif
    }

    if (mNoFrame)
        displayFlags |= SDL_NOFRAME;

    return displayFlags;
#else
    return 0;
#endif  // USE_OPENGL
}

bool Graphics::setOpenGLMode() restrict2
{
#ifdef USE_OPENGL
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    if (!(mWindow = graphicsManager.createWindow(
        mActualWidth, mActualHeight,
        mBpp, getOpenGLFlags())))
    {
        logger->log("Window/context creation failed");
        mRect.w = 0;
        mRect.h = 0;
        return false;
    }

#if defined(USE_X11)
    Glx::initFunctions();
#endif
#ifdef __native_client__
    NaclGles::initGles();
#endif

#ifdef USE_SDL2
    int w1 = 0;
    int h1 = 0;
    SDL_GetWindowSize(mWindow, &w1, &h1);
    mRect.w = CAST_S32(w1 / mScale);
    mRect.h = CAST_S32(h1 / mScale);

    createGLContext();
#else  // USE_SDL2

    createGLContext();
    mRect.w = CAST_U16(mWindow->w / mScale);
    mRect.h = CAST_U16(mWindow->h / mScale);

#endif  // USE_SDL2

#ifdef __APPLE__
    if (mSync)
    {
        const GLint VBL = 1;
        CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &VBL);
    }
#endif

    graphicsManager.setGLVersion();
    graphicsManager.logVersion();

    // Setup OpenGL
    glViewport(0, 0, mActualWidth, mActualHeight);
    int gotDoubleBuffer = 0;
    SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &gotDoubleBuffer);
    logger->log("Using OpenGL %s double buffering.",
                (gotDoubleBuffer ? "with" : "without"));

    graphicsManager.initOpenGL();
    initArrays(graphicsManager.getMaxVertices());
    graphicsManager.updateTextureCompressionFormat();
    graphicsManager.updateTextureFormat();
    updateMemoryInfo();

    GLint texSize;
    bool rectTex = graphicsManager.supportExtension(
        "GL_ARB_texture_rectangle") ||
        graphicsManager.supportExtension("GL_EXT_texture_rectangle");

    if (rectTex
        && OpenGLImageHelper::getInternalTextureType() == 4
        && getOpenGL() != RENDER_GLES_OPENGL
        && getOpenGL() != RENDER_GLES2_OPENGL
        && getOpenGL() != RENDER_MODERN_OPENGL
        && config.getBoolValue("rectangulartextures")
        && !graphicsManager.isUseTextureSampler())
    {
        logger->log1("using GL_ARB_texture_rectangle");
        OpenGLImageHelper::mTextureType = GL_TEXTURE_RECTANGLE_ARB;
        glEnable(GL_TEXTURE_RECTANGLE_ARB);
        glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB, &texSize);
        OpenGLImageHelper::mTextureSize = texSize;
        logger->log("OpenGL texture size: %d pixels (rectangle textures)",
            OpenGLImageHelper::mTextureSize);
#ifndef ANDROID
        SafeOpenGLImageHelper::mTextureType = GL_TEXTURE_RECTANGLE_ARB;
        SafeOpenGLImageHelper::mTextureSize = texSize;
#endif
    }
    else
    {
        glGetIntegerv(GL_MAX_TEXTURE_SIZE, &texSize);
        OpenGLImageHelper::mTextureType = GL_TEXTURE_2D;
        OpenGLImageHelper::mTextureSize = texSize;
#ifndef ANDROID
        SafeOpenGLImageHelper::mTextureType = GL_TEXTURE_2D;
        SafeOpenGLImageHelper::mTextureSize = texSize;
#endif
        logger->log("OpenGL texture size: %d pixels",
            OpenGLImageHelper::mTextureSize);
    }
    return videoInfo();
#else  // USE_OPENGL

    return false;
#endif  // USE_OPENGL
}

int Graphics::getSoftwareFlags() const restrict2
{
#ifdef USE_SDL2
    int displayFlags = SDL_WINDOW_SHOWN;
#else
    int displayFlags = SDL_ANYFORMAT;

    if (mHWAccel)
        displayFlags |= SDL_HWSURFACE | SDL_DOUBLEBUF;
    else
        displayFlags |= SDL_SWSURFACE;
#endif

    if (mFullscreen)
        displayFlags |= SDL_FULLSCREEN;
    else if (mEnableResize)
        displayFlags |= SDL_RESIZABLE;

    if (mNoFrame)
        displayFlags |= SDL_NOFRAME;
    return displayFlags;
}

#ifdef USE_OPENGL
void Graphics::createGLContext() restrict2
{
#ifdef USE_SDL2
    mGLContext = SDL_GL_CreateContext(mWindow);
#endif
}
#endif

void Graphics::updateMemoryInfo() restrict2
{
#ifdef USE_OPENGL
    if (mStartFreeMem)
        return;

    if (graphicsManager.supportExtension("GL_NVX_gpu_memory_info"))
    {
        glGetIntegerv(GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX,
            &mStartFreeMem);
        logger->log("free video memory: %d", mStartFreeMem);
    }
#endif
}

int Graphics::getMemoryUsage() const restrict2
{
#ifdef USE_OPENGL
    if (!mStartFreeMem)
        return 0;

    if (graphicsManager.supportExtension("GL_NVX_gpu_memory_info"))
    {
        GLint val;
        glGetIntegerv(GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX,
            &val);
        return mStartFreeMem - val;
    }
#endif
    return 0;
}

#ifdef USE_SDL2
void Graphics::dumpRendererInfo(const char *restrict const str,
                                const SDL_RendererInfo &restrict info)
                                restrict2
{
    logger->log(str, info.name);
    logger->log("flags:");
    if (info.flags & SDL_RENDERER_SOFTWARE)
        logger->log(" software");
    if (info.flags & SDL_RENDERER_ACCELERATED)
        logger->log(" accelerated");
    if (info.flags & SDL_RENDERER_PRESENTVSYNC)
        logger->log(" vsync");
    if (info.flags & SDL_RENDERER_TARGETTEXTURE)
        logger->log(" texture target");
}
#endif

bool Graphics::videoInfo() restrict2
{
    logger->log("SDL video info");
#ifdef USE_SDL2
    logger->log("Using video driver: %s", SDL_GetCurrentVideoDriver());

    if (mRenderer)
    {
        SDL_RendererInfo info;
        SDL_GetRendererInfo(mRenderer, &info);
        dumpRendererInfo("Current SDL renderer name: %s", info);

        const int num = SDL_GetNumRenderDrivers();
        logger->log("Known renderers");
        for (int f = 0; f < num; f ++)
        {
            if (!SDL_GetRenderDriverInfo(f, &info))
                dumpRendererInfo("renderer name: %s", info);
        }
    }
#else
    char videoDriverName[65];
    if (SDL_VideoDriverName(videoDriverName, 64))
        logger->log("Using video driver: %s", videoDriverName);
    else
        logger->log1("Using video driver: unknown");
    mDoubleBuffer = ((mWindow->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF);
    logger->log("Double buffer mode: %s", mDoubleBuffer ? "yes" : "no");

    ImageHelper::dumpSurfaceFormat(mWindow);

    const SDL_VideoInfo *restrict const vi = SDL_GetVideoInfo();
    if (!vi)
        return false;

    logger->log("Possible to create hardware surfaces: %s",
            ((vi->hw_available) ? "yes" : "no"));
    logger->log("Window manager available: %s",
            ((vi->wm_available) ? "yes" : "no"));
    logger->log("Accelerated hardware to hardware blits: %s",
            ((vi->blit_hw) ? "yes" : "no"));
    logger->log("Accelerated hardware to hardware colorkey blits: %s",
            ((vi->blit_hw_CC) ? "yes" : "no"));
    logger->log("Accelerated hardware to hardware alpha blits: %s",
            ((vi->blit_hw_A) ? "yes" : "no"));
    logger->log("Accelerated software to hardware blits: %s",
            ((vi->blit_sw) ? "yes" : "no"));
    logger->log("Accelerated software to hardware colorkey blits: %s",
            ((vi->blit_sw_CC) ? "yes" : "no"));
    logger->log("Accelerated software to hardware alpha blits: %s",
            ((vi->blit_sw_A) ? "yes" : "no"));
    logger->log("Accelerated color fills: %s",
            ((vi->blit_fill) ? "yes" : "no"));
#endif

    return true;
}

bool Graphics::setFullscreen(const bool fs) restrict2
{
    if (mFullscreen == fs)
        return true;

    return setVideoMode(mActualWidth, mActualHeight, mScale, mBpp, fs,
        mHWAccel, mEnableResize, mNoFrame);
}

bool Graphics::resizeScreen(const int width,
                            const int height) restrict2
{
#ifdef USE_SDL2
    endDraw();

    mRect.w = CAST_S32(width / mScale);
    mRect.h = CAST_S32(height / mScale);
    mWidth = width / mScale;
    mHeight = height / mScale;
    mActualWidth = width;
    mActualHeight = height;

#ifdef USE_OPENGL
    // +++ probably this way will not work in windows/mac
    // Setup OpenGL
    glViewport(0, 0, mActualWidth, mActualHeight);
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
#else  // USE_OPENGL
    // +++ need impliment resize in soft mode
#endif  // USE_OPENGL

    screenResized();
    beginDraw();
    return true;

#else  // USE_SDL2

    const int prevWidth = mWidth;
    const int prevHeight = mHeight;

    endDraw();

    bool success = true;
#ifdef __native_client__
    if (mOpenGL != RENDER_SOFTWARE)
    {
        mRect.w = CAST_S32(width / mScale);
        mRect.h = CAST_S32(height / mScale);
        mWidth = width / mScale;
        mHeight = height / mScale;
        mActualWidth = width;
        mActualHeight = height;
#ifdef USE_OPENGL
        naclResizeBuffers(mActualWidth, mActualHeight);
        glViewport(0, 0, mActualWidth, mActualHeight);
#endif  // USE_OPENGL
    }
    else
#endif  // __native_client__
    {
        success = setVideoMode(width, height, mScale, mBpp,
            mFullscreen, mHWAccel, mEnableResize, mNoFrame);

        // If it didn't work, try to restore the previous size. If that didn't
        // work either, bail out (but then we're in deep trouble).
        if (!success)
        {
            if (!setVideoMode(prevWidth, prevHeight, mScale, mBpp,
                mFullscreen, mHWAccel, mEnableResize, mNoFrame))
            {
                return false;
            }
        }
    }

    screenResized();
    beginDraw();

    return success;
#endif  // USE_SDL2
}

int Graphics::getWidth() const restrict2
{
    return mWidth;
}

int Graphics::getHeight() const restrict2
{
    return mHeight;
}

void Graphics::drawNet(const int x1, const int y1,
                       const int x2, const int y2,
                       const int width, const int height) restrict2
{
    for (int y = y1; y < y2; y += height)
        drawLine(x1, y, x2, y);

    for (int x = x1; x < x2; x += width)
        drawLine(x, y1, x, y2);
}

#ifdef USE_SDL2
void Graphics::setWindowSize(const int width,
                             const int height) restrict2
{
    SDL_SetWindowSize(mWindow, width, height);
}
#else
void Graphics::setWindowSize(const int width A_UNUSED,
                             const int height A_UNUSED) restrict2
{
}
#endif

void Graphics::pushClipArea(const Rect &restrict area) restrict2
{
    // Ignore area with a negate width or height
    // by simple pushing an empty clip area
    // to the stack.
    if (area.width < 0 || area.height < 0)
    {
        ClipRect &carea = mClipStack.push();
        carea.x = 0;
        carea.y = 0;
        carea.width = 0;
        carea.height = 0;
        carea.xOffset = 0;
        carea.yOffset = 0;
        return;
    }

    if (mClipStack.empty())
    {
        ClipRect &carea = mClipStack.push();
        carea.x = area.x;
        carea.y = area.y;
        carea.width = area.width;
        carea.height = area.height;
        carea.xOffset = area.x;
        carea.yOffset = area.y;
        return;
    }

    const ClipRect &top = mClipStack.top();
    ClipRect &carea = mClipStack.push();
    carea.x = area.x + top.xOffset;
    carea.y = area.y + top.yOffset;
    carea.width = area.width;
    carea.height = area.height;
    carea.xOffset = top.xOffset + area.x;
    carea.yOffset = top.yOffset + area.y;

    // Clamp the pushed clip rectangle.
    if (carea.x < top.x)
        carea.x = top.x;

    if (carea.y < top.y)
        carea.y = top.y;

    if (carea.x + carea.width > top.x + top.width)
    {
        carea.width = top.x + top.width - carea.x;

        if (carea.width < 0)
            carea.width = 0;
    }

    if (carea.y + carea.height > top.y + top.height)
    {
        carea.height = top.y + top.height - carea.y;

        if (carea.height < 0)
            carea.height = 0;
    }
}

void Graphics::popClipArea() restrict2
{
    if (mClipStack.empty())
        return;

    mClipStack.pop();
}

#ifdef USE_OPENGL
void Graphics::setOpenGLFlags() restrict2
{
    // here disable/enable probably need convert to mgl

    glEnable(GL_SCISSOR_TEST);

    glDisable(GL_MULTISAMPLE);
    glDisable(GL_DITHER);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_LINE_SMOOTH);
    glDisable(GL_POLYGON_SMOOTH);
    glDisable(GL_STENCIL_TEST);
    glDisable(GL_COLOR_LOGIC_OP);
    glDisable(GL_DEPTH_BOUNDS_TEST_EXT);
    glDisable(GL_DEPTH_CLAMP);
    glDisable(GL_RASTERIZER_DISCARD);
    glDisable(GL_SAMPLE_MASK);

#ifndef ANDROID
#ifndef __MINGW32__
    glHint(GL_TEXTURE_COMPRESSION_HINT, GL_FASTEST);
#endif
#endif
    glHint(GL_TEXTURE_COMPRESSION_HINT_ARB, GL_FASTEST);

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
#endif