20c8287efc
If the user is using their context from a non-main thread, we could be calling -[NSOpenGLContext update] on our thread, while they were accessing it on their thread. With this change, we schedule updates when the event comes in on the main thread, and act on them when the user calls SDL_GL_MakeCurrent or SDL_GL_SwapWindow.
339 lines
9.2 KiB
Objective-C
339 lines
9.2 KiB
Objective-C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2013 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_config.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_3_2_Core
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#define kCGLOGLPVersion_3_2_Core 0x3200
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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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SDL_AtomicSet(&self->dirty, 0);
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return [super initWithFormat:format shareContext:share];
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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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@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 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 > 0x0302) {
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SDL_SetError ("OpenGL > 3.2 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_3_2_Core;
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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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SDL_WindowData *windowdata = (SDL_WindowData *)window->driverdata;
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SDLOpenGLContext *nscontext = (SDLOpenGLContext *)context;
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windowdata->nscontext = nscontext;
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if ([nscontext view] != [windowdata->nswindow contentView]) {
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[nscontext setView:[windowdata->nswindow contentView]];
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[nscontext scheduleUpdate];
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}
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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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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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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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SDL_WindowData *windowdata = (SDL_WindowData *)window->driverdata;
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SDLOpenGLContext *nscontext = windowdata->nscontext;
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pool = [[NSAutoreleasePool alloc] init];
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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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NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
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pool = [[NSAutoreleasePool alloc] init];
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[nscontext clearDrawable];
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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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