mac_gl_common.m

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#include "config.h"
#include "config_unix.h"
#include "debug.h"
#include "host.h"
 
#include "mac_gl_common.h"
 
#include <Availability.h>
#import <Cocoa/Cocoa.h>
#include <OpenGL/gl.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <string.h>
#include <stdlib.h>
 
#ifndef __MAC_10_7
#warning "You are compling on pre-10.7 Mac OS X version. Core OpenGL 3.2 profile won't work"
#warning "in case you'll try to use this binary with Lion or higher (only legacy OpenGL)."
#endif
 
#define MAC_GL_MAGIC 0xa23f4f28u
 
struct state_mac_gl;
 
int get_mac_kernel_version_major()
{
        int mib[2];
        size_t len;
        char *kernelVersion;
 
        // Get the kernel's version as a string called "kernelVersion":
        mib[0] = CTL_KERN;
        mib[1] = KERN_OSRELEASE;
        sysctl(mib, 2, NULL, &len, NULL, 0);
        kernelVersion = malloc(len * sizeof(char));
        sysctl(mib, 2, kernelVersion, &len, NULL, 0);
 
        return atoi(kernelVersion);
}
 
@interface UltraGridOpenGLView : NSOpenGLView
{
        NSWindow *window;
        @public
        NSOpenGLContext *context;
}
 
-(void) initialize: (struct state_mac_gl *) s;
@end
 
struct state_mac_gl
{
        uint32_t magic;
        UltraGridOpenGLView *view;
        NSAutoreleasePool *autoreleasePool;
        NSOpenGLPixelFormat * pixFmt;
};
 
void *mac_gl_init(mac_opengl_version_t ogl_version)
{
        struct state_mac_gl *s;
        NSOpenGLPixelFormatAttribute attrs[3];
        int mac_version_major;
 
        mac_version_major = get_mac_kernel_version_major();
 
        if(ogl_version == MAC_GL_PROFILE_3_2) { /* Lion or later */
#ifdef __MAC_10_7
                if(mac_version_major < 11) {
                        fprintf(stderr, "[Mac OpenGL] Unable to activate OpenGL 3.2 for pre-Lion Macs.\n");
                        return NULL;
                }
                attrs[0] = kCGLPFAOpenGLProfile;
                attrs[1] = kCGLOGLPVersion_3_2_Core; // kCGLOGLPVersion_Legacy;
                attrs[2] = 0;
#else
                fprintf(stderr, "[Mac OpenGL] OpenGL 3.2 support was not compiled in! Did you compile with an older Mac?\n");
                return NULL;
#endif
        } else if(ogl_version == MAC_GL_PROFILE_LEGACY) {
#ifdef __MAC_10_7
                if(mac_version_major >= 11) {
                        attrs[0] = kCGLPFAOpenGLProfile;
                        attrs[1] = kCGLOGLPVersion_Legacy; // kCGLOGLPVersion_Legacy;
                        attrs[2] = 0;
                }
#else
                attrs[0] = 0;
#endif
        }
 
        s = (struct state_mac_gl *) malloc(sizeof(struct state_mac_gl));
        s->magic = MAC_GL_MAGIC;
 
        NSApplicationLoad();
 
        NSApp = [NSApplication sharedApplication];
 
        s->autoreleasePool = [[NSAutoreleasePool alloc] init];
 
        if(mac_version_major >= 11) {
                s->pixFmt = [[NSOpenGLPixelFormat alloc] initWithAttributes: attrs];
        } else {
                s->pixFmt = [NSOpenGLView defaultPixelFormat];
        }
 
        if(!s->pixFmt) {
                fprintf(stderr, "[Mac OpenGL] Failed to acquire pixel format.\n");
                return NULL;
        }
 
        s->view = [[UltraGridOpenGLView alloc] initWithFrame:NSMakeRect(0, 0, 100, 100) pixelFormat: s->pixFmt];
 
        [ s->view display];
        [ s->view initialize: s];
 
        return s;
}
 
void mac_gl_free(void * state)
{
        struct state_mac_gl *s = (struct state_mac_gl *) state;
 
        [ s->view release ];
        [ s->autoreleasePool release ];
        free(s);
}
 
void mac_gl_make_current(void * state)
{
        struct state_mac_gl *s = (struct state_mac_gl *) state;
 
        if(state) {
                [s->view->context makeCurrentContext];
        } else {
                [NSOpenGLContext clearCurrentContext];
        }
}
 
@implementation UltraGridOpenGLView
-(void) initialize: (struct state_mac_gl *) s
{
        window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 100, 100)
#ifdef __MAC_10_12
                                             styleMask:NSWindowStyleMaskBorderless
#else
                                             styleMask:NSBorderlessWindowMask
#endif
                                               backing:NSBackingStoreBuffered
                                                 defer:NO];
        [window autorelease];
        //[window setTitle:@"UltraGrid OpenGL view"];
 
        context = [[NSOpenGLContext alloc] initWithFormat: s->pixFmt
                                             shareContext:nil];
        [self setOpenGLContext:context];
        [context makeCurrentContext];
        [context release];
        printf("OpenGL renderer: %s %s (GLSL: %s)\n", glGetString(GL_RENDERER), glGetString(GL_VERSION), glGetString(GL_SHADING_LANGUAGE_VERSION));
 
        [window setContentSize:NSMakeSize(100, 100)];
}
@end