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+/*
+ Copyright 2019-2020 David Robillard <d@drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+ @file mac_gl.m
+ @brief OpenGL graphics backend for MacOS.
+*/
+
+#include "pugl/detail/implementation.h"
+#include "pugl/detail/mac.h"
+#include "pugl/detail/stub.h"
+#include "pugl/pugl_gl.h"
+
+#ifndef __MAC_10_10
+# define NSOpenGLProfileVersion4_1Core NSOpenGLProfileVersion3_2Core
+#endif
+
+@interface PuglOpenGLView : NSOpenGLView
+@end
+
+@implementation PuglOpenGLView
+{
+@public
+ PuglView* puglview;
+}
+
+- (id) initWithFrame:(NSRect)frame
+{
+ const bool compat = puglview->hints[PUGL_USE_COMPAT_PROFILE];
+ const unsigned samples = (unsigned)puglview->hints[PUGL_SAMPLES];
+ const int major = puglview->hints[PUGL_CONTEXT_VERSION_MAJOR];
+ const unsigned profile = ((compat || major < 3)
+ ? NSOpenGLProfileVersionLegacy
+ : (major >= 4
+ ? NSOpenGLProfileVersion4_1Core
+ : NSOpenGLProfileVersion3_2Core));
+
+ // Set attributes to default if they are unset
+ // (There is no GLX_DONT_CARE equivalent on MacOS)
+ if (puglview->hints[PUGL_DEPTH_BITS] == PUGL_DONT_CARE) {
+ puglview->hints[PUGL_DEPTH_BITS] = 0;
+ }
+ if (puglview->hints[PUGL_STENCIL_BITS] == PUGL_DONT_CARE) {
+ puglview->hints[PUGL_STENCIL_BITS] = 0;
+ }
+ if (puglview->hints[PUGL_SAMPLES] == PUGL_DONT_CARE) {
+ puglview->hints[PUGL_SAMPLES] = 1;
+ }
+ if (puglview->hints[PUGL_DOUBLE_BUFFER] == PUGL_DONT_CARE) {
+ puglview->hints[PUGL_DOUBLE_BUFFER] = 1;
+ }
+ if (puglview->hints[PUGL_SWAP_INTERVAL] == PUGL_DONT_CARE) {
+ puglview->hints[PUGL_SWAP_INTERVAL] = 1;
+ }
+
+ const unsigned colorSize = (unsigned)(puglview->hints[PUGL_RED_BITS] +
+ puglview->hints[PUGL_BLUE_BITS] +
+ puglview->hints[PUGL_GREEN_BITS] +
+ puglview->hints[PUGL_ALPHA_BITS]);
+
+ NSOpenGLPixelFormatAttribute pixelAttribs[17] = {
+ NSOpenGLPFADoubleBuffer,
+ NSOpenGLPFAAccelerated,
+ NSOpenGLPFAOpenGLProfile, profile,
+ NSOpenGLPFAColorSize, colorSize,
+ NSOpenGLPFADepthSize, (unsigned)puglview->hints[PUGL_DEPTH_BITS],
+ NSOpenGLPFAStencilSize, (unsigned)puglview->hints[PUGL_STENCIL_BITS],
+ NSOpenGLPFAMultisample, samples ? 1 : 0,
+ NSOpenGLPFASampleBuffers, samples ? 1 : 0,
+ NSOpenGLPFASamples, samples,
+ 0};
+
+ NSOpenGLPixelFormat* pixelFormat = [
+ [NSOpenGLPixelFormat alloc] initWithAttributes:pixelAttribs];
+
+ if (pixelFormat) {
+ self = [super initWithFrame:frame pixelFormat:pixelFormat];
+ [pixelFormat release];
+ } else {
+ self = [super initWithFrame:frame];
+ }
+
+ [self setWantsBestResolutionOpenGLSurface:YES];
+
+ if (self) {
+ [[self openGLContext] makeCurrentContext];
+ [self reshape];
+ }
+ return self;
+}
+
+- (void) reshape
+{
+ PuglWrapperView* wrapper = (PuglWrapperView*)[self superview];
+
+ [super reshape];
+ [wrapper setReshaped];
+}
+
+- (void) drawRect:(NSRect)rect
+{
+ PuglWrapperView* wrapper = (PuglWrapperView*)[self superview];
+ [wrapper dispatchExpose:rect];
+}
+
+@end
+
+static PuglStatus
+puglMacGlCreate(PuglView* view)
+{
+ PuglInternals* impl = view->impl;
+ PuglOpenGLView* drawView = [PuglOpenGLView alloc];
+
+ drawView->puglview = view;
+ [drawView initWithFrame:[impl->wrapperView bounds]];
+ if (view->hints[PUGL_RESIZABLE]) {
+ [drawView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
+ } else {
+ [drawView setAutoresizingMask:NSViewNotSizable];
+ }
+
+ impl->drawView = drawView;
+ return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglMacGlDestroy(PuglView* view)
+{
+ PuglOpenGLView* const drawView = (PuglOpenGLView*)view->impl->drawView;
+
+ [drawView removeFromSuperview];
+ [drawView release];
+
+ view->impl->drawView = nil;
+ return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglMacGlEnter(PuglView* view, const PuglEventExpose* PUGL_UNUSED(expose))
+{
+ PuglOpenGLView* const drawView = (PuglOpenGLView*)view->impl->drawView;
+
+ [[drawView openGLContext] makeCurrentContext];
+ return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglMacGlLeave(PuglView* view, const PuglEventExpose* expose)
+{
+ PuglOpenGLView* const drawView = (PuglOpenGLView*)view->impl->drawView;
+
+ if (expose) {
+ [[drawView openGLContext] flushBuffer];
+ }
+
+ [NSOpenGLContext clearCurrentContext];
+
+ return PUGL_SUCCESS;
+}
+
+PuglGlFunc
+puglGetProcAddress(const char *name)
+{
+ CFBundleRef framework =
+ CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengl"));
+
+ CFStringRef symbol = CFStringCreateWithCString(
+ kCFAllocatorDefault, name, kCFStringEncodingASCII);
+
+ PuglGlFunc func = (PuglGlFunc)CFBundleGetFunctionPointerForName(
+ framework, symbol);
+
+ CFRelease(symbol);
+
+ return func;
+}
+
+const PuglBackend* puglGlBackend(void)
+{
+ static const PuglBackend backend = {puglStubConfigure,
+ puglMacGlCreate,
+ puglMacGlDestroy,
+ puglMacGlEnter,
+ puglMacGlLeave,
+ puglStubGetContext};
+
+ return &backend;
+}