gwt.g3d.resources.ShaderResourceGenerator.java Source code

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Here is the source code for gwt.g3d.resources.ShaderResourceGenerator.java

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/*
 * Copyright 2009 Hao Nguyen
 * 
 * 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 gwt.g3d.resources;

import gwt.g3d.client.gl2.GL2;
import gwt.g3d.client.shader.AbstractShader;
import gwt.g3d.client.shader.ShaderException;
import gwt.g3d.resources.client.ShaderResource;

import java.net.URL;

import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.dev.util.Util;
import com.google.gwt.resources.ext.AbstractResourceGenerator;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.ext.ResourceGeneratorUtil;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.gwt.user.rebind.StringSourceWriter;

/**
 * Generator for {@link ShaderResource}.
 * 
 * @author hao1300@gmail.com
 */
public final class ShaderResourceGenerator extends AbstractResourceGenerator {

    @Override
    public String createAssignment(TreeLogger logger, ResourceContext context, JMethod method)
            throws UnableToCompleteException {
        URL[] resources = ResourceGeneratorUtil.findResources(logger, context, method);

        if (resources.length != 2) {
            logger.log(TreeLogger.ERROR, "Exactly two resources must be specified", null);
            throw new UnableToCompleteException();
        }

        SourceWriter sw = new StringSourceWriter();
        sw.println("new " + ShaderResource.class.getName() + "() {");
        sw.indent();

        sw.println("public String getVertexShaderSource() {");
        sw.indent();
        String vertexSource = Generator.escape(Util.readURLAsString(resources[0]));
        sw.println("return \"" + vertexSource + "\";");
        sw.outdent();
        sw.println("}");

        sw.println("public String getFragmentShaderSource() {");
        sw.indent();
        String fragmentSource = Generator.escape(Util.readURLAsString(resources[1]));
        sw.println("return \"" + fragmentSource + "\";");
        sw.outdent();
        sw.println("}");

        sw.println(String.format("public %s createShader(%s gl) throws %s {", AbstractShader.class.getName(),
                GL2.class.getName(), ShaderException.class.getName()));
        sw.indent();
        sw.println(String.format("%s shader = %s;", AbstractShader.class.getName(),
                createAbstractShader(logger, context, method)));
        sw.println("shader.init(gl);");
        sw.println("return shader;");
        sw.outdent();
        sw.println("}");

        sw.println("public String getName() {");
        sw.indent();
        sw.println("return \"" + method.getName() + "\";");
        sw.outdent();
        sw.println("}");

        sw.outdent();
        sw.println("}");

        return sw.toString();
    }

    /**
     * Creates an assignment for {@link AbstractShader}.
     */
    private String createAbstractShader(TreeLogger logger, ResourceContext context, JMethod method)
            throws UnableToCompleteException {
        SourceWriter sw = new StringSourceWriter();
        sw.println("new " + AbstractShader.class.getName() + "() {");
        sw.indent();

        sw.println(String.format("protected void initImpl() throws %s {", ShaderException.class.getName()));
        sw.indent();
        sw.println("initProgram(getVertexShaderSource(), getFragmentShaderSource());");
        sw.outdent();
        sw.println("}");

        sw.outdent();
        sw.println("}");
        return sw.toString();
    }
}