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/*
* Copyright (C) 2013 The CyanogenMod Project
*
* 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.cyanogenmod.wallpapers.photophase.shapes;
import android.content.Context;
import android.opengl.GLES20;
import org.cyanogenmod.wallpapers.photophase.GLESUtil;
import org.cyanogenmod.wallpapers.photophase.GLESUtil.GLColor;
import org.cyanogenmod.wallpapers.photophase.R;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;
/**
* A shape plus color.
*/
public class ColorShape implements DrawableShape {
private int mProgramHandler;
private int mPositionHandler;
private int mColorHandler;
private int mMatrixHandler;
private FloatBuffer mVertexBuffer;
private ShortBuffer mVertexOrderBuffer;
private final GLColor mColor;
/**
* Constructor of <code>ColorShape</code>.
*
* @param ctx The current context
* @param vertex The vertext data
* @param color The color
*/
public ColorShape(Context ctx, float[] vertex, GLColor color) {
super();
mColor = color;
mProgramHandler =
GLESUtil.createProgram(
ctx.getResources(),
R.raw.color_vertex_shader,
R.raw.color_fragment_shader);
mPositionHandler = GLES20.glGetAttribLocation(mProgramHandler, "aPosition");
GLESUtil.glesCheckError("glGetAttribLocation");
mColorHandler = GLES20.glGetAttribLocation(mProgramHandler, "aColor");
GLESUtil.glesCheckError("glGetAttribLocation");
mMatrixHandler = GLES20.glGetUniformLocation(mProgramHandler, "uMVPMatrix");
GLESUtil.glesCheckError("glGetUniformLocation");
// Initialize vertex byte buffer for shape coordinates
ByteBuffer bb = ByteBuffer.allocateDirect(vertex.length * 4); // (# of coordinate values * 4 bytes per float)
bb.order(ByteOrder.nativeOrder());
mVertexBuffer = bb.asFloatBuffer();
mVertexBuffer.put(vertex);
mVertexBuffer.position(0);
// Initialize vertex byte buffer for shape coordinates order
final short[] order = { 0, 1, 2, 0, 2, 3 };
ByteBuffer dlb = ByteBuffer.allocateDirect(order.length * 2); // (# of coordinate values * 2 bytes per short)
dlb.order(ByteOrder.nativeOrder());
mVertexOrderBuffer = dlb.asShortBuffer();
mVertexOrderBuffer.put(order);
mVertexOrderBuffer.position(0);
}
/**
* {@inheritDoc}
*/
@Override
public void draw(float[] matrix) {
// Enable properties
if (mColor.a != 1.0f) {
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_SRC_COLOR, GLES20.GL_ONE_MINUS_SRC_ALPHA);
}
// Set the program and its attributes
GLES20.glUseProgram(mProgramHandler);
GLESUtil.glesCheckError("glUseProgram");
// Position
mVertexBuffer.position(0);
GLES20.glVertexAttribPointer(
mPositionHandler,
3,
GLES20.GL_FLOAT,
false,
3 * 4,
mVertexBuffer);
GLESUtil.glesCheckError("glVertexAttribPointer");
GLES20.glEnableVertexAttribArray(mPositionHandler);
GLESUtil.glesCheckError("glEnableVertexAttribArray");
// Color
GLES20.glVertexAttrib4f(mColorHandler, mColor.r, mColor.g, mColor.b, mColor.a);
GLESUtil.glesCheckError("glVertexAttrib4f");
// Apply the projection and view transformation
GLES20.glUniformMatrix4fv(mMatrixHandler, 1, false, matrix, 0);
GLESUtil.glesCheckError("glUniformMatrix4fv");
// Draw the photo frame
mVertexOrderBuffer.position(0);
GLES20.glDrawElements(
GLES20.GL_TRIANGLE_FAN,
6,
GLES20.GL_UNSIGNED_SHORT,
mVertexOrderBuffer);
GLESUtil.glesCheckError("glDrawElements");
// Disable attributes
GLES20.glDisableVertexAttribArray(mPositionHandler);
GLESUtil.glesCheckError("glDisableVertexAttribArray");
GLES20.glDisableVertexAttribArray(mColorHandler);
GLESUtil.glesCheckError("glDisableVertexAttribArray");
// Disable properties
if (mColor.a != 1.0f) {
GLES20.glDisable(GLES20.GL_BLEND);
GLESUtil.glesCheckError("glDisable");
}
}
/**
* Method that sets the alpha color of the shape
*
* @param value The new alpha color of the shape
*/
public void setAlpha(float value) {
mColor.a = value;
}
/**
* Method that destroy all the internal references
*/
public void recycle() {
if (GLES20.glIsProgram(mProgramHandler)) {
GLES20.glDeleteProgram(mProgramHandler);
GLESUtil.glesCheckError("glDeleteProgram");
}
mProgramHandler = 0;
mPositionHandler = 0;
mColorHandler = 0;
mMatrixHandler = 0;
mVertexBuffer.clear();
mVertexOrderBuffer.clear();
mVertexBuffer = null;
mVertexOrderBuffer = null;
}
}
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