com.ryandymock.consumptionvisualization.shader.ParticleMaterial.java Source code

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Here is the source code for com.ryandymock.consumptionvisualization.shader.ParticleMaterial.java

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/**
* Copyright (c) 2014 Google, Inc. All rights reserved.
*
* 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 com.ryandymock.consumptionvisualization.shader;

import com.ryandymock.consumptionvisualization.ParticleRenderer;
import com.ryandymock.consumptionvisualization.Renderer;

import android.content.Context;
import android.opengl.GLES20;
import android.util.Log;

import org.json.JSONException;
import org.json.JSONObject;

/**
 * ParticleMaterial.
 * This is the particle point sprite material.
 */
public class ParticleMaterial extends Material {
    private static final String TAG = "ParticleMaterial";
    private static final String DIFFUSE_TEXTURE_NAME = "uDiffuseTexture";

    private float mParticleSizeScale;

    public ParticleMaterial(Context context, JSONObject json) {
        super(new ShaderProgram("particle.glslv", "particle.glslf"));

        // Read in values from the JSON file
        mParticleSizeScale = (float) json.optDouble("particleSizeScale", 1.0);

        // Add the water texture that is scrolling
        try {
            String textureName = json.getString(DIFFUSE_TEXTURE_NAME);
            addTexture(DIFFUSE_TEXTURE_NAME, new Texture(context, textureName));
        } catch (JSONException ex) {
            Log.e(TAG, "Missing point sprite texture!\n" + ex.getMessage());
        }
    }

    @Override
    public void beginRender() {
        super.beginRender();

        // Specific uniforms to this material
        GLES20.glUniform1f(getUniformLocation("uPointSize"),
                Math.max(1.0f, mParticleSizeScale * ParticleRenderer.FB_SIZE
                        * (Renderer.PARTICLE_RADIUS / Renderer.getInstance().sRenderWorldHeight)));
    }
}