org.jogamp.glg2d.impl.gl2.GL2ImageDrawer.java Source code

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Here is the source code for org.jogamp.glg2d.impl.gl2.GL2ImageDrawer.java

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/*
 * Copyright 2013 Brandon Borkholder
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jogamp.glg2d.impl.gl2;

import java.awt.Color;
import java.awt.geom.AffineTransform;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GLContext;
import org.newdawn.slick.opengl.Texture;

import org.jogamp.glg2d.GLGraphics2D;
import org.jogamp.glg2d.impl.AbstractImageHelper;

public class GL2ImageDrawer extends AbstractImageHelper {
    protected GLContext context;

    protected AffineTransform savedTransform;

    @Override
    public void setG2D(GLGraphics2D g2d) {
        super.setG2D(g2d);
        context = g2d.getGLContext();
    }

    @Override
    protected void begin(Texture texture, AffineTransform xform, Color bgcolor) {
        GL11.glTexEnvi(GL11.GL_TEXTURE_ENV, GL11.GL_TEXTURE_ENV_MODE, GL11.GL_MODULATE);
        GL11.glTexParameterf(GL11.GL_TEXTURE_ENV, GL11.GL_TEXTURE_ENV_MODE, GL11.GL_BLEND);

        /*
         * FIXME This is unexpected since we never disable blending, but in some
         * cases it interacts poorly with multiple split panes, scroll panes and the
         * text renderer to disable blending.
         */
        g2d.setComposite(g2d.getComposite());

        GL11.glEnable(GL11.GL_TEXTURE_2D);
        texture.bind();

        savedTransform = null;
        if (xform != null && !xform.isIdentity()) {
            savedTransform = g2d.getTransform();
            g2d.transform(xform);
        }

        g2d.getColorHelper().setColorRespectComposite(bgcolor == null ? Color.white : bgcolor);
    }

    @Override
    protected void end(Texture texture) {
        if (savedTransform != null) {
            g2d.setTransform(savedTransform);
        }

        GL11.glDisable(GL11.GL_TEXTURE_2D);
        g2d.getColorHelper().setColorRespectComposite(g2d.getColor());
    }

    @Override
    protected void applyTexture(Texture texture, float dx1, float dy1, float dx2, float dy2, float sx1, float sy1,
            float sx2, float sy2) {
        GL11.glBegin(GL11.GL_QUADS);

        // SW
        GL11.glTexCoord2f(sx1, sy2);
        GL11.glVertex2f(dx1, dy2);
        // SE
        GL11.glTexCoord2f(sx2, sy2);
        GL11.glVertex2f(dx2, dy2);
        // NE
        GL11.glTexCoord2f(sx2, sy1);
        GL11.glVertex2f(dx2, dy1);
        // NW
        GL11.glTexCoord2f(sx1, sy1);
        GL11.glVertex2f(dx1, dy1);

        GL11.glEnd();
    }
}