Atlas - SDL_uikitopengles.m
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 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 defined(SDL_VIDEO_DRIVER_UIKIT) && (defined(SDL_VIDEO_OPENGL_ES) || defined(SDL_VIDEO_OPENGL_ES2))
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 <dlfcn.h>
35
36@interface SDLEAGLContext : EAGLContext
37
38// The OpenGL ES context owns a view / drawable.
39@property(nonatomic, strong) SDL_uikitopenglview *sdlView;
40
41@end
42
43@implementation SDLEAGLContext
44
45- (void)dealloc
46{
47    /* When the context is deallocated, its view should be removed from any
48     * SDL window that it's attached to. */
49    [self.sdlView setSDLWindow:NULL];
50}
51
52@end
53
54SDL_FunctionPointer UIKit_GL_GetProcAddress(SDL_VideoDevice *_this, const char *proc)
55{
56    /* Look through all SO's for the proc symbol.  Here's why:
57     * -Looking for the path to the OpenGL Library seems not to work in the iOS Simulator.
58     * -We don't know that the path won't change in the future. */
59    return dlsym(RTLD_DEFAULT, proc);
60}
61
62/*
63  note that SDL_GL_DestroyContext makes it current without passing the window
64*/
65bool UIKit_GL_MakeCurrent(SDL_VideoDevice *_this, SDL_Window *window, SDL_GLContext context)
66{
67    @autoreleasepool {
68        SDLEAGLContext *eaglcontext = (__bridge SDLEAGLContext *)context;
69
70        if (![EAGLContext setCurrentContext:eaglcontext]) {
71            return SDL_SetError("Could not make EAGL context current");
72        }
73
74        if (eaglcontext) {
75            [eaglcontext.sdlView setSDLWindow:window];
76        }
77    }
78
79    return true;
80}
81
82bool UIKit_GL_LoadLibrary(SDL_VideoDevice *_this, const char *path)
83{
84    /* We shouldn't pass a path to this function, since we've already loaded the
85     * library. */
86    if (path != NULL) {
87        return SDL_SetError("iOS GL Load Library just here for compatibility");
88    }
89    return true;
90}
91
92bool UIKit_GL_SwapWindow(SDL_VideoDevice *_this, SDL_Window *window)
93{
94    @autoreleasepool {
95        SDLEAGLContext *context = (__bridge SDLEAGLContext *)SDL_GL_GetCurrentContext();
96
97#ifdef SDL_POWER_UIKIT
98        // Check once a frame to see if we should turn off the battery monitor.
99        SDL_UIKit_UpdateBatteryMonitoring();
100#endif
101
102        [context.sdlView swapBuffers];
103
104        /* You need to pump events in order for the OS to make changes visible.
105         * We don't pump events here because we don't want iOS application events
106         * (low memory, terminate, etc.) to happen inside low level rendering. */
107    }
108    return true;
109}
110
111SDL_GLContext UIKit_GL_CreateContext(SDL_VideoDevice *_this, SDL_Window *window)
112{
113    @autoreleasepool {
114        SDLEAGLContext *context = nil;
115        SDL_uikitopenglview *view;
116        SDL_UIKitWindowData *data = (__bridge SDL_UIKitWindowData *)window->internal;
117        CGRect frame = UIKit_ComputeViewFrame(window, data.uiwindow.screen);
118        EAGLSharegroup *sharegroup = nil;
119        CGFloat scale = 1.0;
120        int samples = 0;
121        int major = _this->gl_config.major_version;
122        int minor = _this->gl_config.minor_version;
123
124        /* The EAGLRenderingAPI enum values currently map 1:1 to major GLES
125         * versions. */
126        EAGLRenderingAPI api = major;
127
128        // iOS currently doesn't support GLES >3.0.
129        if (major > 3 || (major == 3 && minor > 0)) {
130            SDL_SetError("OpenGL ES %d.%d context could not be created", major, minor);
131            return NULL;
132        }
133
134        if (_this->gl_config.multisamplebuffers > 0) {
135            samples = _this->gl_config.multisamplesamples;
136        }
137
138        if (_this->gl_config.share_with_current_context) {
139            EAGLContext *currContext = (__bridge EAGLContext *)SDL_GL_GetCurrentContext();
140            sharegroup = currContext.sharegroup;
141        }
142
143        if (window->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY) {
144            /* Set the scale to the natural scale factor of the screen - the
145             * backing dimensions of the OpenGL view will match the pixel
146             * dimensions of the screen rather than the dimensions in points. */
147            scale = data.uiwindow.screen.nativeScale;
148        }
149
150        context = [[SDLEAGLContext alloc] initWithAPI:api sharegroup:sharegroup];
151        if (!context) {
152            SDL_SetError("OpenGL ES %d context could not be created", _this->gl_config.major_version);
153            return NULL;
154        }
155
156        // construct our view, passing in SDL's OpenGL configuration data
157        view = [[SDL_uikitopenglview alloc] initWithFrame:frame
158                                                    scale:scale
159                                            retainBacking:_this->gl_config.retained_backing
160                                                    rBits:_this->gl_config.red_size
161                                                    gBits:_this->gl_config.green_size
162                                                    bBits:_this->gl_config.blue_size
163                                                    aBits:_this->gl_config.alpha_size
164                                                depthBits:_this->gl_config.depth_size
165                                              stencilBits:_this->gl_config.stencil_size
166                                                     sRGB:_this->gl_config.framebuffer_srgb_capable
167                                             multisamples:samples
168                                                  context:context];
169
170        if (!view) {
171            return NULL;
172        }
173
174        SDL_PropertiesID props = SDL_GetWindowProperties(window);
175        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_UIKIT_OPENGL_FRAMEBUFFER_NUMBER, view.drawableFramebuffer);
176        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_UIKIT_OPENGL_RENDERBUFFER_NUMBER, view.drawableRenderbuffer);
177        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_UIKIT_OPENGL_RESOLVE_FRAMEBUFFER_NUMBER, view.msaaResolveFramebuffer);
178
179        // The context owns the view / drawable.
180        context.sdlView = view;
181
182        if (!UIKit_GL_MakeCurrent(_this, window, (__bridge SDL_GLContext)context)) {
183            UIKit_GL_DestroyContext(_this, (SDL_GLContext)CFBridgingRetain(context));
184            return NULL;
185        }
186
187        /* We return a +1'd context. The window's internal owns the view (via
188         * MakeCurrent.) */
189        return (SDL_GLContext)CFBridgingRetain(context);
190    }
191}
192
193bool UIKit_GL_DestroyContext(SDL_VideoDevice *_this, SDL_GLContext context)
194{
195    @autoreleasepool {
196        /* The context was retained in SDL_GL_CreateContext, so we release it
197         * here. The context's view will be detached from its window when the
198         * context is deallocated. */
199        CFRelease(context);
200    }
201    return true;
202}
203
204void UIKit_GL_RestoreCurrentContext(void)
205{
206    @autoreleasepool {
207        /* Some iOS system functionality (such as Dictation on the on-screen
208         keyboard) uses its own OpenGL ES context but doesn't restore the
209         previous one when it's done. This is a workaround to make sure the
210         expected SDL-created OpenGL ES context is active after the OS is
211         finished running its own code for the frame. If this isn't done, the
212         app may crash or have other nasty symptoms when Dictation is used.
213         */
214        EAGLContext *context = (__bridge EAGLContext *)SDL_GL_GetCurrentContext();
215        if (context != NULL && [EAGLContext currentContext] != context) {
216            [EAGLContext setCurrentContext:context];
217        }
218    }
219}
220
221#endif // SDL_VIDEO_DRIVER_UIKIT
222
[FILE END]
(C) 2025 0x4248
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