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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package com.sun.scenario.effect.impl.prism.ps;

import com.sun.javafx.geom.Rectangle;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.prism.Texture;
import com.sun.prism.ps.Shader;
import com.sun.prism.ps.ShaderGraphics;
import com.sun.scenario.effect.FilterContext;
import com.sun.scenario.effect.Filterable;
import com.sun.scenario.effect.ImageData;
import com.sun.scenario.effect.impl.Renderer;
import com.sun.scenario.effect.impl.prism.PrTexture;
import com.sun.scenario.effect.impl.state.RenderState;

public abstract class PPSOneSamplerPeer<T extends RenderState> extends PPSEffectPeer<T> {

    private Shader shader;

    protected PPSOneSamplerPeer(FilterContext fctx, Renderer r, String shaderName) {
        super(fctx, r, shaderName);
    }

    @Override
    public void dispose() {
        if (shader != null) {
            shader.dispose();
        }
    }

    @Override
    ImageData filterImpl(ImageData... inputs) {
        Filterable srcF = inputs[0].getUntransformedImage();
        final PrTexture srcTex = (PrTexture) srcF;
        final Rectangle srcBounds = inputs[0].getUntransformedBounds();
        final Rectangle dstBounds = getDestBounds();
        final int dstw = dstBounds.width;
        final int dsth = dstBounds.height;

        PPSRenderer renderer = getRenderer();
        PPSDrawable dst = renderer.getCompatibleImage(dstw, dsth);
        if (dst == null) {
            renderer.markLost();
            return new ImageData(getFilterContext(), dst, dstBounds);
        }
        setDestNativeBounds(dst.getPhysicalWidth(), dst.getPhysicalHeight());

        BaseTransform srcTransform = inputs[0].getTransform();
        setInputBounds(0, srcBounds);
        setInputTransform(0, srcTransform);
        setInputNativeBounds(0, srcTex.getNativeBounds());
        float srcRect[] = new float[8];
        int srcCoords = getTextureCoordinates(0, srcRect,
                                              srcBounds.x, srcBounds.y,
                                              srcF.getPhysicalWidth(),
                                              srcF.getPhysicalHeight(),
                                              dstBounds,
                                              srcTransform);

        ShaderGraphics g = dst.createGraphics();
        if (g == null) {
            renderer.markLost();
            return new ImageData(getFilterContext(), dst, dstBounds);
        }
        if (shader == null) {
            shader = createShader();
        }
        if (shader == null || !shader.isValid()) {
            renderer.markLost();
            return new ImageData(getFilterContext(), dst, dstBounds);
        }
        g.setExternalShader(shader);
        updateShader(shader);

        float dx1 = 0;
        float dy1 = 0;
        float dx2 = dstw;
        float dy2 = dsth;

        // take the texture content origin into account
        Texture ptex = srcTex.getTextureObject();
        if (ptex == null) {
            renderer.markLost();
            return new ImageData(getFilterContext(), dst, dstBounds);
        }
        float txoff = ((float)ptex.getContentX()) / ptex.getPhysicalWidth();
        float tyoff = ((float)ptex.getContentY()) / ptex.getPhysicalHeight();
        float tx11 = txoff + srcRect[0];
        float ty11 = tyoff + srcRect[1];
        float tx22 = txoff + srcRect[2];
        float ty22 = tyoff + srcRect[3];
        if (srcCoords < 8) {
            g.drawTextureRaw(ptex,
                             dx1, dy1, dx2, dy2,
                             tx11, ty11, tx22, ty22);
        } else {
            float tx21 = txoff + srcRect[4];
            float ty21 = tyoff + srcRect[5];
            float tx12 = txoff + srcRect[6];
            float ty12 = tyoff + srcRect[7];

            g.drawMappedTextureRaw(ptex,
                                   dx1, dy1, dx2, dy2,
                                   tx11, ty11, tx21, ty21,
                                   tx12, ty12, tx22, ty22);
        }
        g.setExternalShader(null);

        return new ImageData(getFilterContext(), dst, dstBounds);
    }
}