DanceGame/Classes/Unity/EAGLContextHelper.mm

#include "EAGLContextHelper.h"
#include "UnityRendering.h"

#import <QuartzCore/QuartzCore.h>
#import <OpenGLES/EAGL.h>
#import <OpenGLES/ES2/gl.h>
#import <OpenGLES/ES2/glext.h>

extern "C" bool AllocateRenderBufferStorageFromEAGLLayer(void* eaglContext, void* eaglLayer)
{
    return [(__bridge EAGLContext*)eaglContext renderbufferStorage: GL_RENDERBUFFER fromDrawable: (__bridge CAEAGLLayer*)eaglLayer];
}

extern "C" void DeallocateRenderBufferStorageFromEAGLLayer(void* eaglContext)
{
    [(__bridge EAGLContext*)eaglContext renderbufferStorage: GL_RENDERBUFFER fromDrawable: nil];
}

extern "C" EAGLContext* UnityCreateContextEAGL(EAGLContext * parent, int api)
{
    const int       targetApi   = parent ? parent.API : api;
    EAGLSharegroup* group       = parent ? parent.sharegroup : nil;

    return [[EAGLContext alloc] initWithAPI: (EAGLRenderingAPI)targetApi sharegroup: group];
}
extern "C" void UnityMakeCurrentContextEAGL(EAGLContext* context)
{
    [EAGLContext setCurrentContext: context];
}

extern "C" EAGLContext* UnityGetCurrentContextEAGL()
{
    return [EAGLContext currentContext];
}

EAGLContextSetCurrentAutoRestore::EAGLContextSetCurrentAutoRestore(EAGLContext* cur_) : old([EAGLContext currentContext]), cur(cur_)
{
    if (old != cur)
    {
        [EAGLContext setCurrentContext: cur];
        UnityOnSetCurrentGLContext(cur);
    }
}

EAGLContextSetCurrentAutoRestore::EAGLContextSetCurrentAutoRestore(UnityDisplaySurfaceBase* surface)
    : old(surface->api == apiMetal ? nil : [EAGLContext currentContext]),
    cur(surface->api == apiMetal ? nil : ((UnityDisplaySurfaceGLES*)surface)->context)
{
    if (old != cur)
    {
        [EAGLContext setCurrentContext: cur];
        UnityOnSetCurrentGLContext(cur);
    }
}

EAGLContextSetCurrentAutoRestore::~EAGLContextSetCurrentAutoRestore()
{
    if (old != cur)
    {
        [EAGLContext setCurrentContext: old];
        UnityOnSetCurrentGLContext(old);
    }
}