Atlas - SDL_uikitopengles.m
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "../../SDL_internal.h"
22
23#if SDL_VIDEO_DRIVER_UIKIT
24
25#include "SDL_uikitopengles.h"
26#import "SDL_uikitopenglview.h"
27#include "SDL_uikitmodes.h"
28#include "SDL_uikitwindow.h"
29#include "SDL_uikitevents.h"
30#include "../SDL_sysvideo.h"
31#include "../../events/SDL_keyboard_c.h"
32#include "../../events/SDL_mouse_c.h"
33#include "../../power/uikit/SDL_syspower.h"
34#include "SDL_loadso.h"
35#include <dlfcn.h>
36
37@interface SDLEAGLContext : EAGLContext
38
39/* The OpenGL ES context owns a view / drawable. */
40@property (nonatomic, strong) SDL_uikitopenglview *sdlView;
41
42@end
43
44@implementation SDLEAGLContext
45
46- (void)dealloc
47{
48    /* When the context is deallocated, its view should be removed from any
49     * SDL window that it's attached to. */
50    [self.sdlView setSDLWindow:NULL];
51}
52
53@end
54
55void *
56UIKit_GL_GetProcAddress(_THIS, const char *proc)
57{
58    /* Look through all SO's for the proc symbol.  Here's why:
59     * -Looking for the path to the OpenGL Library seems not to work in the iOS Simulator.
60     * -We don't know that the path won't change in the future. */
61    return dlsym(RTLD_DEFAULT, proc);
62}
63
64/*
65  note that SDL_GL_DeleteContext makes it current without passing the window
66*/
67int
68UIKit_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
69{
70    @autoreleasepool {
71        SDLEAGLContext *eaglcontext = (__bridge SDLEAGLContext *) context;
72
73        if (![EAGLContext setCurrentContext:eaglcontext]) {
74            return SDL_SetError("Could not make EAGL context current");
75        }
76
77        if (eaglcontext) {
78            [eaglcontext.sdlView setSDLWindow:window];
79        }
80    }
81
82    return 0;
83}
84
85void
86UIKit_GL_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
87{
88    @autoreleasepool {
89        SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
90        UIView *view = data.viewcontroller.view;
91        if ([view isKindOfClass:[SDL_uikitopenglview class]]) {
92            SDL_uikitopenglview *glview = (SDL_uikitopenglview *) view;
93            if (w) {
94                *w = glview.backingWidth;
95            }
96            if (h) {
97                *h = glview.backingHeight;
98            }
99        }
100    }
101}
102
103int
104UIKit_GL_LoadLibrary(_THIS, const char *path)
105{
106    /* We shouldn't pass a path to this function, since we've already loaded the
107     * library. */
108    if (path != NULL) {
109        return SDL_SetError("iOS GL Load Library just here for compatibility");
110    }
111    return 0;
112}
113
114int UIKit_GL_SwapWindow(_THIS, SDL_Window * window)
115{
116    @autoreleasepool {
117        SDLEAGLContext *context = (__bridge SDLEAGLContext *) SDL_GL_GetCurrentContext();
118
119#if SDL_POWER_UIKIT
120        /* Check once a frame to see if we should turn off the battery monitor. */
121        SDL_UIKit_UpdateBatteryMonitoring();
122#endif
123
124        [context.sdlView swapBuffers];
125
126        /* You need to pump events in order for the OS to make changes visible.
127         * We don't pump events here because we don't want iOS application events
128         * (low memory, terminate, etc.) to happen inside low level rendering. */
129    }
130    return 0;
131}
132
133SDL_GLContext
134UIKit_GL_CreateContext(_THIS, SDL_Window * window)
135{
136    @autoreleasepool {
137        SDLEAGLContext *context = nil;
138        SDL_uikitopenglview *view;
139        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
140        CGRect frame = UIKit_ComputeViewFrame(window, data.uiwindow.screen);
141        EAGLSharegroup *sharegroup = nil;
142        CGFloat scale = 1.0;
143        int samples = 0;
144        int major = _this->gl_config.major_version;
145        int minor = _this->gl_config.minor_version;
146
147        /* The EAGLRenderingAPI enum values currently map 1:1 to major GLES
148         * versions. */
149        EAGLRenderingAPI api = major;
150
151        /* iOS currently doesn't support GLES >3.0. iOS 6 also only supports up
152         * to GLES 2.0. */
153        if (major > 3 || (major == 3 && (minor > 0 || !UIKit_IsSystemVersionAtLeast(7.0)))) {
154            SDL_SetError("OpenGL ES %d.%d context could not be created", major, minor);
155            return NULL;
156        }
157
158        if (_this->gl_config.multisamplebuffers > 0) {
159            samples = _this->gl_config.multisamplesamples;
160        }
161
162        if (_this->gl_config.share_with_current_context) {
163            EAGLContext *context = (__bridge EAGLContext *) SDL_GL_GetCurrentContext();
164            sharegroup = context.sharegroup;
165        }
166
167        if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
168            /* Set the scale to the natural scale factor of the screen - the
169             * backing dimensions of the OpenGL view will match the pixel
170             * dimensions of the screen rather than the dimensions in points. */
171#ifdef __IPHONE_8_0
172            if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
173                scale = data.uiwindow.screen.nativeScale;
174            } else
175#endif
176            {
177                scale = data.uiwindow.screen.scale;
178            }
179        }
180
181        context = [[SDLEAGLContext alloc] initWithAPI:api sharegroup:sharegroup];
182        if (!context) {
183            SDL_SetError("OpenGL ES %d context could not be created", _this->gl_config.major_version);
184            return NULL;
185        }
186
187        /* construct our view, passing in SDL's OpenGL configuration data */
188        view = [[SDL_uikitopenglview alloc] initWithFrame:frame
189                                                    scale:scale
190                                            retainBacking:_this->gl_config.retained_backing
191                                                    rBits:_this->gl_config.red_size
192                                                    gBits:_this->gl_config.green_size
193                                                    bBits:_this->gl_config.blue_size
194                                                    aBits:_this->gl_config.alpha_size
195                                                depthBits:_this->gl_config.depth_size
196                                              stencilBits:_this->gl_config.stencil_size
197                                                     sRGB:_this->gl_config.framebuffer_srgb_capable
198                                             multisamples:samples
199                                                  context:context];
200
201        if (!view) {
202            return NULL;
203        }
204
205        /* The context owns the view / drawable. */
206        context.sdlView = view;
207
208        if (UIKit_GL_MakeCurrent(_this, window, (__bridge SDL_GLContext) context) < 0) {
209            UIKit_GL_DeleteContext(_this, (SDL_GLContext) CFBridgingRetain(context));
210            return NULL;
211        }
212
213        /* We return a +1'd context. The window's driverdata owns the view (via
214         * MakeCurrent.) */
215        return (SDL_GLContext) CFBridgingRetain(context);
216    }
217}
218
219void
220UIKit_GL_DeleteContext(_THIS, SDL_GLContext context)
221{
222    @autoreleasepool {
223        /* The context was retained in SDL_GL_CreateContext, so we release it
224         * here. The context's view will be detached from its window when the
225         * context is deallocated. */
226        CFRelease(context);
227    }
228}
229
230void
231UIKit_GL_RestoreCurrentContext(void)
232{
233    @autoreleasepool {
234        /* Some iOS system functionality (such as Dictation on the on-screen
235         keyboard) uses its own OpenGL ES context but doesn't restore the
236         previous one when it's done. This is a workaround to make sure the
237         expected SDL-created OpenGL ES context is active after the OS is
238         finished running its own code for the frame. If this isn't done, the
239         app may crash or have other nasty symptoms when Dictation is used.
240         */
241        EAGLContext *context = (__bridge EAGLContext *) SDL_GL_GetCurrentContext();
242        if (context != NULL && [EAGLContext currentContext] != context) {
243            [EAGLContext setCurrentContext:context];
244        }
245    }
246}
247
248#endif /* SDL_VIDEO_DRIVER_UIKIT */
249
250/* vi: set ts=4 sw=4 expandtab: */
251
[FILE END]
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