lwjgl/src/native/macosx/org_lwjgl_opengl_Pbuffer.m

/* 
 * Copyright (c) 2002-2004 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.
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 * * 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.
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 */

/**
 * $Id$
 *
 * Mac OS X Pbuffer.
 *
 * @author elias_naur <elias_naur@users.sourceforge.net>
 * @version $Revision$
 */

#import <jni.h>
#import <OpenGL/gl.h>
#import <OpenGL/glext.h>
#import "org_lwjgl_opengl_MacOSXDisplay.h"
#import "org_lwjgl_opengl_Pbuffer.h"
#import "display.h"

typedef struct {
	NSOpenGLPixelBuffer *pbuffer;
	NSOpenGLContext *context;
} PbufferInfo;

/* Check capacity and throw i not large enough to hold a PbufferInfo struct */
static bool checkCapacity(JNIEnv *env, jobject pbuffer_handle) {
	if ((*env)->GetDirectBufferCapacity(env, pbuffer_handle) < sizeof(PbufferInfo)) {
		throwException(env, "Handle buffer not large enough");
		return false;
	} else
		return true;
}

static PbufferInfo *getPbufferInfoFromBuffer(JNIEnv *env, jobject pbuffer_handle) {
	if (checkCapacity(env, pbuffer_handle))
		return (PbufferInfo *)(*env)->GetDirectBufferAddress(env, pbuffer_handle);
	else
		return NULL;
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXDisplay_makePbufferCurrent(JNIEnv *env, jobject this, jobject pbuffer_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	PbufferInfo *pbuffer_handle_ptr = getPbufferInfoFromBuffer(env, pbuffer_handle);
	if (pbuffer_handle_ptr == NULL)
		return;
	[pbuffer_handle_ptr->context makeCurrentContext];
	[pool release];
}

static void createPbuffer(JNIEnv *env, jobject pbuffer_handle, jint width, jint height, jobject pixel_format, NSOpenGLContext *shared_context)
{
    if (!checkCapacity(env, pbuffer_handle))
        return;

    NSOpenGLPixelBuffer *pbuffer = nil;

    // check if the texture is power of 2
    if ( (( width > 0 ) && ( width & ( width-1)) == 0) || (( height > 0 ) && ( height & ( height-1)) == 0) )
    {
        pbuffer = [[NSOpenGLPixelBuffer alloc] initWithTextureTarget:GL_TEXTURE_2D
                                                textureInternalFormat:GL_RGBA
                                                textureMaxMipMapLevel:0
                                                pixelsWide:width
                                                pixelsHigh:height];
    }
    else
    {
        pbuffer = [[NSOpenGLPixelBuffer alloc] initWithTextureTarget:GL_TEXTURE_RECTANGLE_EXT
                                                textureInternalFormat:GL_RGBA
                                                textureMaxMipMapLevel:0
                                                pixelsWide:width
                                                pixelsHigh:height];
    }


    if (pbuffer == nil)
    {
        throwException(env, "Could not allocate Pbuffer");
        return;
    }

    NSOpenGLContext *context = createContext(env, pixel_format, false, false, NSOpenGLPFAPixelBuffer, shared_context);

    if (context == nil)
    {
        return;
    }

    int screen;
    if (getDisplayContext() != NULL)
    {
        screen = [getDisplayContext() currentVirtualScreen];
    }
    else
    {
        screen = 0;
    }

    [context setPixelBuffer:pbuffer cubeMapFace:0 mipMapLevel:0 currentVirtualScreen:screen];

    PbufferInfo *pbuffer_handle_ptr = (PbufferInfo *)(*env)->GetDirectBufferAddress(env, pbuffer_handle);
    pbuffer_handle_ptr->pbuffer = pbuffer;
    pbuffer_handle_ptr->context = context;
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXDisplay_nCreatePbuffer(JNIEnv *env, jobject this, jobject pbuffer_handle, jint width, jint height, jobject pixel_format, jobject pixelFormatCaps, jobject pBufferAttribs, jobject shared_context_handle_buffer) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	NSOpenGLContext *shared_context = getDisplayContext();
	if (shared_context_handle_buffer != NULL) {
		PbufferInfo *pbuffer_handle_ptr = (PbufferInfo *)(*env)->GetDirectBufferAddress(env, shared_context_handle_buffer);
		shared_context = pbuffer_handle_ptr->context;
	}
	createPbuffer(env, pbuffer_handle, width, height, pixel_format, shared_context);
	[pool release];
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_MacOSXDisplay_destroyPbuffer(JNIEnv *env, jobject this, jobject pbuffer_handle) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	PbufferInfo *pbuffer_handle_ptr = getPbufferInfoFromBuffer(env, pbuffer_handle);
	if (pbuffer_handle_ptr == NULL)
		return;
	[pbuffer_handle_ptr->context clearDrawable];
	[pbuffer_handle_ptr->context release];
	[pbuffer_handle_ptr->pbuffer release];
	[pool release];
}