/*
 * Copyright (c) 2002-2008 LWJGL Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'LWJGL' nor the names of
 *   its contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * $Id$
 *
 * @author elias_naur <elias_naur@users.sourceforge.net>
 * @version $Revision$
 */

#import <jni.h>
#import <OpenGL/CGLCurrent.h>
#import <OpenGL/CGLTypes.h>
#import <OpenGL/CGLDevice.h>
#import <Cocoa/Cocoa.h>
#import "org_lwjgl_opengl_MacOSXContextImplementation.h"
#import "context.h"
#import "common_tools.h"

typedef struct {
    NSOpenGLContext *context;
    MacOSXPeerInfo *peer_info;
} MacOSXContext;

JNIEXPORT jobject JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nCreate
  (JNIEnv *env, jclass clazz, jobject peer_info_handle, jobject shared_context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	MacOSXPeerInfo *peer_info;
	MacOSXContext *shared_context_info;
	MacOSXContext *context_info;
    NSOpenGLContext *context;
    NSOpenGLContext *shared_context = NULL;

	jobject context_handle = newJavaManagedByteBuffer(env, sizeof(MacOSXContext));
	if (context_handle == NULL) {
		throwException(env, "Could not create handle buffer");
		return NULL;
	}
	peer_info = (MacOSXPeerInfo *)(*env)->GetDirectBufferAddress(env, peer_info_handle);
	if (shared_context_handle != NULL) {
		shared_context_info = (MacOSXContext *)(*env)->GetDirectBufferAddress(env, shared_context_handle);
        shared_context = shared_context_info->context;
	}
    context = [[NSOpenGLContext alloc] initWithFormat:peer_info->pixel_format shareContext:shared_context];
    if (context == NULL) {
        throwException(env, "Could not create context");
        return NULL;
    }
	
	if (peer_info->window_info->fullscreen) {
		// set a fixed backbuffer size for fullscreen
		CGLContextObj cgcontext = (CGLContextObj)[context CGLContextObj];
		NSSize displaySize = peer_info->window_info->display_rect.size;
		GLint dim[2] = {displaySize.width, displaySize.height};
		CGLSetParameter(cgcontext, kCGLCPSurfaceBackingSize, dim);
		CGLEnable(cgcontext, kCGLCESurfaceBackingSize);  
	}
	else {
		// disable any fixed backbuffer size to allow resizing
		CGLContextObj cgcontext = (CGLContextObj)[context CGLContextObj];
		CGLDisable(cgcontext, kCGLCESurfaceBackingSize); 
	}
	  
    [peer_info->window_info->view setOpenGLContext:context];
    peer_info->window_info->context = context;
	context_info = (MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle);
    context_info->context = context;
    context_info->peer_info = peer_info;
    
	[pool release];
	return context_handle;
}

JNIEXPORT jlong JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_getCGLShareGroup
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
	CGLContextObj cgl_context = [[peer_info->window_info->view openGLContext] CGLContextObj];
	CGLShareGroupObj share_group = CGLGetShareGroup(cgl_context);
	[pool release];
	return (jlong)share_group;
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nSwapBuffers
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
	[[peer_info->window_info->view openGLContext] flushBuffer];
    peer_info->canDrawGL = true;
	[pool release];
}


JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nUpdate
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
	[[peer_info->window_info->view openGLContext] update];
    peer_info->canDrawGL = true;
	[pool release];
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_clearDrawable
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
	[[peer_info->window_info->view openGLContext] clearDrawable];
	[pool release];
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nReleaseCurrentContext
  (JNIEnv *env, jclass clazz) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    [NSOpenGLContext clearCurrentContext];
	[pool release];
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_setView
  (JNIEnv *env, jclass clazz, jobject peer_info_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = (MacOSXPeerInfo *)(*env)->GetDirectBufferAddress(env, peer_info_handle);
    [[peer_info->window_info->view openGLContext] setView: peer_info->window_info->view];
    peer_info->canDrawGL = true;
	[pool release];
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nMakeCurrent
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
    [[peer_info->window_info->view openGLContext] makeCurrentContext];
	[pool release];
}

JNIEXPORT jboolean JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nIsCurrent
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
	bool result = [peer_info->window_info->view openGLContext] == [NSOpenGLContext currentContext];
	[pool release];
	return result ? JNI_TRUE : JNI_FALSE;
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nSetSwapInterval
  (JNIEnv *env, jclass clazz, jobject context_handle, jint int_value) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    MacOSXPeerInfo *peer_info = ((MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle))->peer_info;
	GLint value = int_value;
	[[peer_info->window_info->view openGLContext] setValues:&value forParameter:NSOpenGLCPSwapInterval];
	[pool release];
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXContextImplementation_nDestroy
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	
	MacOSXContext *context_info = (MacOSXContext *)(*env)->GetDirectBufferAddress(env, context_handle);
	// clearDrawable on main thread to ensure its not in use
	[context_info->context performSelectorOnMainThread:@selector(clearDrawable) withObject:nil waitUntilDone:YES];
	[context_info->peer_info->window_info->view setOpenGLContext:nil];
	[context_info->context release];
	
	[pool release];
}