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95f7e242e6
Previously we were postponing our -[NSOpenGLContext update] call to the next SDL_GL_SwapWindow, even if the context was current on the current thread. This changes it so that we will do the update immediately if it's the current context. If you're rendering on another thread, you need to call SDL_GL_SwapWindow once after a resize event to ensure your drawable will produce non-garbage data. Bug: https://bugzilla.libsdl.org/show_bug.cgi?id=2339
413 lines
11 KiB
Objective-C
413 lines
11 KiB
Objective-C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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/* NSOpenGL implementation of SDL OpenGL support */
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#if SDL_VIDEO_OPENGL_CGL
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#include "SDL_cocoavideo.h"
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#include "SDL_cocoaopengl.h"
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#include <OpenGL/CGLTypes.h>
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#include <OpenGL/OpenGL.h>
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#include <OpenGL/CGLRenderers.h>
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#include "SDL_loadso.h"
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#include "SDL_opengl.h"
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#define DEFAULT_OPENGL "/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib"
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#ifndef kCGLPFAOpenGLProfile
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#define kCGLPFAOpenGLProfile 99
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#endif
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#ifndef kCGLOGLPVersion_Legacy
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#define kCGLOGLPVersion_Legacy 0x1000
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#endif
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#ifndef kCGLOGLPVersion_GL3_Core
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#define kCGLOGLPVersion_GL3_Core 0x3200
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#endif
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#ifndef kCGLOGLPVersion_GL4_Core
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#define kCGLOGLPVersion_GL4_Core 0x4100
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#endif
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@implementation SDLOpenGLContext : NSOpenGLContext
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- (id)initWithFormat:(NSOpenGLPixelFormat *)format
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shareContext:(NSOpenGLContext *)share
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{
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self = [super initWithFormat:format shareContext:share];
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if (self) {
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SDL_AtomicSet(&self->dirty, 0);
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self->window = NULL;
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}
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return self;
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}
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- (void)scheduleUpdate
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{
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SDL_AtomicAdd(&self->dirty, 1);
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}
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/* This should only be called on the thread on which a user is using the context. */
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- (void)updateIfNeeded
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{
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int value = SDL_AtomicSet(&self->dirty, 0);
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if (value > 0) {
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/* We call the real underlying update here, since -[SDLOpenGLContext update] just calls us. */
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[super update];
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}
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}
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/* This should only be called on the thread on which a user is using the context. */
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- (void)update
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{
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/* This ensures that regular 'update' calls clear the atomic dirty flag. */
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[self scheduleUpdate];
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[self updateIfNeeded];
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}
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/* Updates the drawable for the contexts and manages related state. */
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- (void)setWindow:(SDL_Window *)newWindow
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{
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if (self->window) {
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SDL_WindowData *oldwindowdata = (SDL_WindowData *)self->window->driverdata;
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/* Make sure to remove us from the old window's context list, or we'll get scheduled updates from it too. */
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NSMutableArray *contexts = oldwindowdata->nscontexts;
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@synchronized (contexts) {
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[contexts removeObject:self];
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}
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}
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self->window = newWindow;
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if (newWindow) {
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SDL_WindowData *windowdata = (SDL_WindowData *)newWindow->driverdata;
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/* Now sign up for scheduled updates for the new window. */
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NSMutableArray *contexts = windowdata->nscontexts;
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@synchronized (contexts) {
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[contexts addObject:self];
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}
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if ([self view] != [windowdata->nswindow contentView]) {
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[self setView:[windowdata->nswindow contentView]];
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if (self == [NSOpenGLContext currentContext]) {
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[self update];
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} else {
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[self scheduleUpdate];
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}
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}
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} else {
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[self clearDrawable];
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if (self == [NSOpenGLContext currentContext]) {
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[self update];
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} else {
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[self scheduleUpdate];
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}
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}
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}
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@end
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int
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Cocoa_GL_LoadLibrary(_THIS, const char *path)
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{
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/* Load the OpenGL library */
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if (path == NULL) {
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path = SDL_getenv("SDL_OPENGL_LIBRARY");
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}
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if (path == NULL) {
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path = DEFAULT_OPENGL;
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}
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_this->gl_config.dll_handle = SDL_LoadObject(path);
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if (!_this->gl_config.dll_handle) {
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return -1;
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}
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SDL_strlcpy(_this->gl_config.driver_path, path,
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SDL_arraysize(_this->gl_config.driver_path));
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return 0;
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}
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void *
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Cocoa_GL_GetProcAddress(_THIS, const char *proc)
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{
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return SDL_LoadFunction(_this->gl_config.dll_handle, proc);
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}
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void
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Cocoa_GL_UnloadLibrary(_THIS)
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{
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SDL_UnloadObject(_this->gl_config.dll_handle);
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_this->gl_config.dll_handle = NULL;
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}
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SDL_GLContext
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Cocoa_GL_CreateContext(_THIS, SDL_Window * window)
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{
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const int wantver = (_this->gl_config.major_version << 8) |
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(_this->gl_config.minor_version);
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SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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NSAutoreleasePool *pool;
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SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
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SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;
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NSOpenGLPixelFormatAttribute attr[32];
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NSOpenGLPixelFormat *fmt;
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SDLOpenGLContext *context;
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NSOpenGLContext *share_context = nil;
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int i = 0;
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if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
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SDL_SetError ("OpenGL ES is not supported on this platform");
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return NULL;
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}
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/* Sadly, we'll have to update this as life progresses, since we need to
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set an enum for context profiles, not a context version number */
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if (wantver > 0x0401) {
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SDL_SetError ("OpenGL > 4.1 is not supported on this platform");
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return NULL;
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}
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pool = [[NSAutoreleasePool alloc] init];
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/* specify a profile if we're on Lion (10.7) or later. */
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if (data->osversion >= 0x1070) {
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NSOpenGLPixelFormatAttribute profile = kCGLOGLPVersion_Legacy;
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if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_CORE) {
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if (wantver == 0x0302) {
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profile = kCGLOGLPVersion_GL3_Core;
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} else if ((wantver == 0x0401) && (data->osversion >= 0x1090)) {
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profile = kCGLOGLPVersion_GL4_Core;
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} else {
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SDL_SetError("Requested GL version is not supported on this platform");
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[pool release];
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return NULL;
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}
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}
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attr[i++] = kCGLPFAOpenGLProfile;
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attr[i++] = profile;
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}
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attr[i++] = NSOpenGLPFAColorSize;
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attr[i++] = SDL_BYTESPERPIXEL(display->current_mode.format)*8;
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attr[i++] = NSOpenGLPFADepthSize;
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attr[i++] = _this->gl_config.depth_size;
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if (_this->gl_config.double_buffer) {
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attr[i++] = NSOpenGLPFADoubleBuffer;
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}
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if (_this->gl_config.stereo) {
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attr[i++] = NSOpenGLPFAStereo;
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}
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if (_this->gl_config.stencil_size) {
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attr[i++] = NSOpenGLPFAStencilSize;
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attr[i++] = _this->gl_config.stencil_size;
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}
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if ((_this->gl_config.accum_red_size +
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_this->gl_config.accum_green_size +
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_this->gl_config.accum_blue_size +
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_this->gl_config.accum_alpha_size) > 0) {
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attr[i++] = NSOpenGLPFAAccumSize;
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attr[i++] = _this->gl_config.accum_red_size + _this->gl_config.accum_green_size + _this->gl_config.accum_blue_size + _this->gl_config.accum_alpha_size;
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}
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if (_this->gl_config.multisamplebuffers) {
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attr[i++] = NSOpenGLPFASampleBuffers;
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attr[i++] = _this->gl_config.multisamplebuffers;
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}
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if (_this->gl_config.multisamplesamples) {
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attr[i++] = NSOpenGLPFASamples;
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attr[i++] = _this->gl_config.multisamplesamples;
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attr[i++] = NSOpenGLPFANoRecovery;
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}
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if (_this->gl_config.accelerated >= 0) {
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if (_this->gl_config.accelerated) {
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attr[i++] = NSOpenGLPFAAccelerated;
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} else {
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attr[i++] = NSOpenGLPFARendererID;
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attr[i++] = kCGLRendererGenericFloatID;
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}
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}
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attr[i++] = NSOpenGLPFAScreenMask;
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attr[i++] = CGDisplayIDToOpenGLDisplayMask(displaydata->display);
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attr[i] = 0;
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fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
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if (fmt == nil) {
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SDL_SetError ("Failed creating OpenGL pixel format");
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[pool release];
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return NULL;
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}
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if (_this->gl_config.share_with_current_context) {
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share_context = (NSOpenGLContext*)SDL_GL_GetCurrentContext();
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}
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context = [[SDLOpenGLContext alloc] initWithFormat:fmt shareContext:share_context];
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[fmt release];
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if (context == nil) {
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SDL_SetError ("Failed creating OpenGL context");
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[pool release];
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return NULL;
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}
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[pool release];
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if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {
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Cocoa_GL_DeleteContext(_this, context);
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return NULL;
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}
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return context;
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}
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int
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Cocoa_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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NSAutoreleasePool *pool;
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pool = [[NSAutoreleasePool alloc] init];
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if (context) {
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SDLOpenGLContext *nscontext = (SDLOpenGLContext *)context;
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[nscontext setWindow:window];
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[nscontext updateIfNeeded];
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[nscontext makeCurrentContext];
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} else {
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[NSOpenGLContext clearCurrentContext];
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}
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[pool release];
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return 0;
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}
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void
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Cocoa_GL_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
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{
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SDL_WindowData *windata = (SDL_WindowData *) window->driverdata;
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NSView *contentView = [windata->nswindow contentView];
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NSRect viewport = [contentView bounds];
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/* This gives us the correct viewport for a Retina-enabled view, only
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* supported on 10.7+. */
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if ([contentView respondsToSelector:@selector(convertRectToBacking:)]) {
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viewport = [contentView convertRectToBacking:viewport];
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}
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if (w) {
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*w = viewport.size.width;
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}
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if (h) {
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*h = viewport.size.height;
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}
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}
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int
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Cocoa_GL_SetSwapInterval(_THIS, int interval)
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{
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NSAutoreleasePool *pool;
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NSOpenGLContext *nscontext;
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GLint value;
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int status;
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if (interval < 0) { /* no extension for this on Mac OS X at the moment. */
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return SDL_SetError("Late swap tearing currently unsupported");
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}
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pool = [[NSAutoreleasePool alloc] init];
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nscontext = (NSOpenGLContext*)SDL_GL_GetCurrentContext();
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if (nscontext != nil) {
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value = interval;
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[nscontext setValues:&value forParameter:NSOpenGLCPSwapInterval];
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status = 0;
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} else {
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status = SDL_SetError("No current OpenGL context");
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}
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[pool release];
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return status;
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}
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int
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Cocoa_GL_GetSwapInterval(_THIS)
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{
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NSAutoreleasePool *pool;
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NSOpenGLContext *nscontext;
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GLint value;
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int status = 0;
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pool = [[NSAutoreleasePool alloc] init];
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nscontext = (NSOpenGLContext*)SDL_GL_GetCurrentContext();
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if (nscontext != nil) {
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[nscontext getValues:&value forParameter:NSOpenGLCPSwapInterval];
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status = (int)value;
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}
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[pool release];
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return status;
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}
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void
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Cocoa_GL_SwapWindow(_THIS, SDL_Window * window)
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{
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NSAutoreleasePool *pool;
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pool = [[NSAutoreleasePool alloc] init];
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SDLOpenGLContext* nscontext = (SDLOpenGLContext*)SDL_GL_GetCurrentContext();
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[nscontext flushBuffer];
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[nscontext updateIfNeeded];
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[pool release];
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}
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void
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Cocoa_GL_DeleteContext(_THIS, SDL_GLContext context)
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{
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NSAutoreleasePool *pool;
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SDLOpenGLContext *nscontext = (SDLOpenGLContext *)context;
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pool = [[NSAutoreleasePool alloc] init];
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[nscontext setWindow:NULL];
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[nscontext release];
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[pool release];
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}
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#endif /* SDL_VIDEO_OPENGL_CGL */
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/* vi: set ts=4 sw=4 expandtab: */
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