org_lwjgl_d3d_WindowsContextImplementation.c from Lightweight Java Game Library at Krugle

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/*
 * 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.
 *
 * * 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: org_lwjgl_d3d_WindowsContextImplementation.c 2832 2007-05-27 15:32:25Z elias_naur $
 *
 * @author elias_naur <elias_naur@users.sourceforge.net>
 * @version $Revision: 2832 $
 */

#include <jni.h>
#include "org_lwjgl_d3d_WindowsContextImplementation.h"
#include "context.h"
#include "common_tools.h"

typedef struct {
	HGLRC context;
} WindowsContext;

JNIEXPORT jobject JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nCreate
  (JNIEnv *env, jclass clazz, jobject peer_info_handle, jobject shared_context_handle) {
	WindowsPeerInfo *peer_info;
	WindowsContext *shared_context_info;
	WindowsContext *context_info;
	HGLRC context;
	HGLRC shared_context = NULL;
	HDC saved_hdc;
	HGLRC saved_context;
	jobject context_handle = newJavaManagedByteBuffer(env, sizeof(WindowsContext));
	if (context_handle == NULL) {
		throwException(env, "Could not create handle buffer");
		return NULL;
	}
	peer_info = (WindowsPeerInfo *)(*env)->GetDirectBufferAddress(env, peer_info_handle);
	context = wglCreateContext(peer_info->drawable_hdc);
	if (context == NULL) {
		throwException(env, "Could not create context");
		return NULL;
	}
	if (shared_context_handle != NULL) {
		shared_context_info = (WindowsContext *)(*env)->GetDirectBufferAddress(env, shared_context_handle);
		shared_context = shared_context_info->context;
		if (!wglShareLists(shared_context, context)) {
			wglDeleteContext(context);
			throwException(env, "Could not share contexts");
			return NULL;
		}
	}
	context_info = (WindowsContext *)(*env)->GetDirectBufferAddress(env, context_handle);
	context_info->context = context;
	return context_handle;
}

JNIEXPORT void JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nSwapBuffers
  (JNIEnv *env, jclass clazz, jobject peer_info_handle) {
	WindowsPeerInfo *peer_info = (WindowsPeerInfo *)(*env)->GetDirectBufferAddress(env, peer_info_handle);
	SwapBuffers(peer_info->drawable_hdc);
}

JNIEXPORT void JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nReleaseCurrentContext
  (JNIEnv *env, jclass clazz) {
	wglMakeCurrent(NULL, NULL);
}

JNIEXPORT void JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nMakeCurrent
  (JNIEnv *env, jclass clazz, jobject peer_info_handle, jobject context_handle) {
	WindowsContext *context_info = (WindowsContext *)(*env)->GetDirectBufferAddress(env, context_handle);
	WindowsPeerInfo *peer_info = (WindowsPeerInfo *)(*env)->GetDirectBufferAddress(env, peer_info_handle);
	if (!wglMakeCurrent(peer_info->drawable_hdc, context_info->context))
		throwException(env, "Could not make context current");
}

JNIEXPORT jboolean JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nIsCurrent
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	WindowsContext *context_info = (WindowsContext *)(*env)->GetDirectBufferAddress(env, context_handle);
	return wglGetCurrentContext() == context_info->context;
}

JNIEXPORT jboolean JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nSetSwapInterval
  (JNIEnv *env, jclass clazz, jint value) {
	WGLExtensions extensions;
	extgl_InitWGL(&extensions);
	if (extensions.WGL_EXT_swap_control) {
		return extensions.wglSwapIntervalEXT(value) ? JNI_TRUE : JNI_FALSE;
	} else
		return JNI_FALSE;
}

JNIEXPORT void JNICALL Java_org_lwjgl_d3d_WindowsContextImplementation_nDestroy
  (JNIEnv *env, jclass clazz, jobject context_handle) {
	WindowsContext *context_info = (WindowsContext *)(*env)->GetDirectBufferAddress(env, context_handle);
	wglDeleteContext(context_info->context);
}
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