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/*
 * Copyright (c) 2009, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.prism.d3d;

import com.sun.glass.ui.Screen;
import com.sun.javafx.geom.Rectangle;
import com.sun.prism.CompositeMode;
import com.sun.prism.Graphics;
import com.sun.prism.Presentable;
import com.sun.prism.PresentableState;
import com.sun.prism.RTTexture;

class D3DSwapChain
    extends D3DResource
    implements D3DRenderTarget, Presentable, D3DContextSource {

    private final D3DRTTexture texBackBuffer;
    private final float pixelScaleFactorX;
    private final float pixelScaleFactorY;

    D3DSwapChain(D3DContext context, long pResource, D3DRTTexture rtt, float pixelScaleX, float pixelScaleY) {
        super(new D3DRecord(context, pResource));
        texBackBuffer = rtt;
        pixelScaleFactorX = pixelScaleX;
        pixelScaleFactorY = pixelScaleY;
    }

    @Override
    public void dispose() {
        texBackBuffer.dispose();
        super.dispose();
    }

    @Override
    public boolean prepare(Rectangle dirtyregion) {
        D3DContext context = getContext();
        context.flushVertexBuffer();
        D3DGraphics g = (D3DGraphics) D3DGraphics.create(this, context);
        if (g == null) {
            return false;
        }
        int sw = texBackBuffer.getContentWidth();
        int sh = texBackBuffer.getContentHeight();
        int dw = this.getContentWidth();
        int dh = this.getContentHeight();
        if (isMSAA()) {
            context.flushVertexBuffer();
            g.blit(texBackBuffer, null, 0, 0, sw, sh, 0, 0, dw, dh);
        } else {
            g.setCompositeMode(CompositeMode.SRC);
            g.drawTexture(texBackBuffer, 0, 0, dw, dh, 0, 0, sw, sh);
        }
        context.flushVertexBuffer();
        texBackBuffer.unlock();
        return true;
    }

    @Override
    public boolean present() {
        D3DContext context = getContext();
        if (context.isDisposed()) {
            return false;
        }
        int res = nPresent(context.getContextHandle(), d3dResRecord.getResource());
        return context.validatePresent(res);
    }

    @Override
    public long getResourceHandle() {
        return d3dResRecord.getResource();
    }

    @Override
    public int getPhysicalWidth() {
        return D3DResourceFactory.nGetTextureWidth(d3dResRecord.getResource());
    }

    @Override
    public int getPhysicalHeight() {
        return D3DResourceFactory.nGetTextureHeight(d3dResRecord.getResource());
    }

    @Override
    public int getContentWidth() {
        return getPhysicalWidth();
    }

    @Override
    public int getContentHeight() {
        return getPhysicalHeight();
    }

    @Override
    public int getContentX() {
        return 0;
    }

    @Override
    public int getContentY() {
        return 0;
    }

    private static native int nPresent(long context, long pSwapChain);

    @Override
    public D3DContext getContext() {
        return d3dResRecord.getContext();
    }

    @Override
    public boolean lockResources(PresentableState pState) {
        if (pState.getRenderWidth() != texBackBuffer.getContentWidth() ||
            pState.getRenderHeight() != texBackBuffer.getContentHeight() ||
            pState.getRenderScaleX() != pixelScaleFactorX ||
            pState.getRenderScaleY() != pixelScaleFactorY)
        {
            return true;
        }
        texBackBuffer.lock();
        return texBackBuffer.isSurfaceLost();
    }

    @Override
    public Graphics createGraphics() {
        Graphics g = D3DGraphics.create(texBackBuffer, getContext());
        g.scale(pixelScaleFactorX, pixelScaleFactorY);
        return g;
    }

    public RTTexture getRTTBackBuffer() {
        return texBackBuffer;
    }

    @Override
    public Screen getAssociatedScreen() {
        return getContext().getAssociatedScreen();
    }

    @Override
    public float getPixelScaleFactorX() {
        return pixelScaleFactorX;
    }

    @Override
    public float getPixelScaleFactorY() {
        return pixelScaleFactorY;
    }

    @Override
    public boolean isOpaque() {
        return texBackBuffer.isOpaque();
    }

    @Override
    public void setOpaque(boolean opaque) {
        texBackBuffer.setOpaque(opaque);
    }

    @Override
    public boolean isMSAA() {
        return texBackBuffer != null ? texBackBuffer.isMSAA() : false;
    }
}