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SDL_uikitopengles.m
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_DRIVER_UIKIT
#include "SDL_uikitopengles.h"
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#import "SDL_uikitopenglview.h"
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#include "SDL_uikitmodes.h"
#include "SDL_uikitwindow.h"
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#include "SDL_uikitevents.h"
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#include "../SDL_sysvideo.h"
#include "../../events/SDL_keyboard_c.h"
#include "../../events/SDL_mouse_c.h"
#include "../../power/uikit/SDL_syspower.h"
#include "SDL_loadso.h"
#include <dlfcn.h>
static int UIKit_GL_Initialize(_THIS);
void *
UIKit_GL_GetProcAddress(_THIS, const char *proc)
{
/* Look through all SO's for the proc symbol. Here's why:
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* -Looking for the path to the OpenGL Library seems not to work in the iOS Simulator.
* -We don't know that the path won't change in the future. */
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return dlsym(RTLD_DEFAULT, proc);
}
/*
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note that SDL_GL_DeleteContext makes it current without passing the window
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*/
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int
UIKit_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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@autoreleasepool {
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SDLEAGLContext *eaglcontext = (__bridge SDLEAGLContext *) context;
if (![EAGLContext setCurrentContext:eaglcontext]) {
return SDL_SetError("Could not make EAGL context current");
}
if (eaglcontext) {
[eaglcontext.sdlView setSDLWindow:window];
}
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}
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return 0;
}
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void
UIKit_GL_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
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{
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@autoreleasepool {
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SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
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UIView *view = data.viewcontroller.view;
if ([view isKindOfClass:[SDL_uikitopenglview class]]) {
SDL_uikitopenglview *glview = (SDL_uikitopenglview *) view;
if (w) {
*w = glview.backingWidth;
}
if (h) {
*h = glview.backingHeight;
}
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}
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}
}
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int
UIKit_GL_LoadLibrary(_THIS, const char *path)
{
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/* We shouldn't pass a path to this function, since we've already loaded the
* library. */
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if (path != NULL) {
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return SDL_SetError("iOS GL Load Library just here for compatibility");
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}
return 0;
}
void UIKit_GL_SwapWindow(_THIS, SDL_Window * window)
{
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@autoreleasepool {
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SDLEAGLContext *context = (__bridge SDLEAGLContext *) SDL_GL_GetCurrentContext();
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#if SDL_POWER_UIKIT
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/* Check once a frame to see if we should turn off the battery monitor. */
SDL_UIKit_UpdateBatteryMonitoring();
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#endif
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[context.sdlView swapBuffers];
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/* You need to pump events in order for the OS to make changes visible.
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* We don't pump events here because we don't want iOS application events
* (low memory, terminate, etc.) to happen inside low level rendering. */
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}
}
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SDL_GLContext
UIKit_GL_CreateContext(_THIS, SDL_Window * window)
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{
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@autoreleasepool {
SDL_uikitopenglview *view;
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SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
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CGRect frame = UIKit_ComputeViewFrame(window, data.uiwindow.screen);
EAGLSharegroup *sharegroup = nil;
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CGFloat scale = 1.0;
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if (_this->gl_config.share_with_current_context) {
EAGLContext *context = (__bridge EAGLContext *) SDL_GL_GetCurrentContext();
sharegroup = context.sharegroup;
}
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if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
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/* Set the scale to the natural scale factor of the screen - the
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* backing dimensions of the OpenGL view will match the pixel
* dimensions of the screen rather than the dimensions in points. */
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#ifdef __IPHONE_8_0
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if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
scale = data.uiwindow.screen.nativeScale;
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} else
#endif
{
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scale = data.uiwindow.screen.scale;
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}
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}
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/* construct our view, passing in SDL's OpenGL configuration data */
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view = [[SDL_uikitopenglview alloc] initWithFrame:frame
scale:scale
retainBacking:_this->gl_config.retained_backing
rBits:_this->gl_config.red_size
gBits:_this->gl_config.green_size
bBits:_this->gl_config.blue_size
aBits:_this->gl_config.alpha_size
depthBits:_this->gl_config.depth_size
stencilBits:_this->gl_config.stencil_size
sRGB:_this->gl_config.framebuffer_srgb_capable
majorVersion:_this->gl_config.major_version
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shareGroup:sharegroup];
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if (!view) {
return NULL;
}
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SDLEAGLContext *context = view.context;
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if (UIKit_GL_MakeCurrent(_this, window, (__bridge SDL_GLContext) context) < 0) {
UIKit_GL_DeleteContext(_this, (SDL_GLContext) CFBridgingRetain(context));
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return NULL;
}
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/* We return a +1'd context. The window's driverdata owns the view (via
* MakeCurrent.) */
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return (SDL_GLContext) CFBridgingRetain(context);
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}
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}
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void
UIKit_GL_DeleteContext(_THIS, SDL_GLContext context)
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{
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@autoreleasepool {
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/* Transfer ownership the +1'd context to ARC. */
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SDLEAGLContext *eaglcontext = (SDLEAGLContext *) CFBridgingRelease(context);
/* Detach the context's view from its window. */
[eaglcontext.sdlView setSDLWindow:NULL];
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}
}
#endif /* SDL_VIDEO_DRIVER_UIKIT */
/* vi: set ts=4 sw=4 expandtab: */