path: root/src/org/cyanogenmod/wallpapers/photophase/transitions/WindowTransition.java

/*
 * 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.transitions;

import android.content.Context;
import android.opengl.GLES20;
import android.opengl.GLException;
import android.opengl.Matrix;
import android.os.SystemClock;
import android.view.animation.AccelerateInterpolator;

import org.cyanogenmod.wallpapers.photophase.utils.GLESUtil;
import org.cyanogenmod.wallpapers.photophase.utils.Utils;
import org.cyanogenmod.wallpapers.photophase.PhotoFrame;
import org.cyanogenmod.wallpapers.photophase.R;
import org.cyanogenmod.wallpapers.photophase.TextureManager;
import org.cyanogenmod.wallpapers.photophase.transitions.Transitions.TRANSITIONS;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * A transition that applies a window effect transition to the picture.
 */
public class WindowTransition extends Transition {

    /**
     * The enumeration of all possibles window movements
     */
    public enum WINDOW_MODES {
        /**
         * Open the picture from left to right
         */
        LEFT_TO_RIGHT,
        /**
         * Open the picture from right to left
         */
        RIGHT_TO_LEFT
    }

    private static final int[] VERTEX_SHADER = {R.raw.default_vertex_shader, R.raw.default_vertex_shader};
    private static final int[] FRAGMENT_SHADER = {R.raw.default_fragment_shader, R.raw.default_fragment_shader};

    private static final float TRANSITION_TIME = 800.0f;

    private static final float SCALE_AMOUNT = 0.2f;

    private WINDOW_MODES mMode;

    private float[] mTranslationMatrix;

    private boolean mRunning;
    private long mTime;

    private AccelerateInterpolator mInterpolation;
    private float mAmount;

    /**
     * Constructor of <code>WindowTransition</code>
     *
     * @param ctx The current context
     * @param tm The texture manager
     */
    public WindowTransition(Context ctx, TextureManager tm) {
        super(ctx, tm, VERTEX_SHADER, FRAGMENT_SHADER);

        // Initialized
        mTranslationMatrix = new float[16];
        reset();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public TRANSITIONS getType() {
        return TRANSITIONS.WINDOW;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean hasTransitionTarget() {
        return true;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isRunning() {
        return mRunning;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void select(PhotoFrame target) {
        super.select(target);
        mInterpolation = new AccelerateInterpolator();
        mAmount = getAmount();

        // Discard all non-supported modes
        List<WINDOW_MODES> modes =
                new ArrayList<WindowTransition.WINDOW_MODES>(
                        Arrays.asList(WINDOW_MODES.values()));
        float[] vertex = target.getFrameVertex();
        if (vertex[4] != -1.0f) {
            modes.remove(WINDOW_MODES.RIGHT_TO_LEFT);
        }
        if (vertex[6] != 1.0f) {
            modes.remove(WINDOW_MODES.LEFT_TO_RIGHT);
        }

        // Random mode
        int low = 0;
        int high = modes.size() - 1;
        mMode = modes.get(Utils.getNextRandom(low, high));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isSelectable(PhotoFrame frame) {
        float[] vertex = frame.getFrameVertex();
        if (vertex[4] == -1.0f || vertex[6] == 1.0f) {
            return true;
        }
        return false;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void reset() {
        mTime = -1;
        mRunning = true;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void apply(float[] matrix) throws GLException {
        // Check internal vars
        if (mTarget == null ||
            mTarget.getPositionBuffer() == null ||
            mTarget.getTextureBuffer() == null) {
            return;
        }
        if (mTransitionTarget == null ||
            mTransitionTarget.getPositionBuffer() == null ||
            mTransitionTarget.getTextureBuffer() == null) {
            return;
        }

        // Set the time the first time
        if (mTime == -1) {
            mTime = SystemClock.uptimeMillis();
        }

        // Calculate the delta time
        final float delta = Math.min(SystemClock.uptimeMillis() - mTime, TRANSITION_TIME) / TRANSITION_TIME;

        // Apply the transition
        applyDstTransition(matrix);
        if (delta < 1) {
            applySrcTransition(delta, matrix);
        }

        // Transition ending
        if (delta == 1) {
            mRunning = false;
        }
    }

    /**
     * Apply the source transition
     *
     * @param delta The delta time
     * @param matrix The model-view-projection matrix
     * @param target The photo frame target
     */
    private void applySrcTransition(float delta, float[] matrix) {
        // Bind default FBO
        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
        GLESUtil.glesCheckError("glBindFramebuffer");

        // Set the program
        useProgram(0);

        // Disable blending
        GLES20.glDisable(GLES20.GL_BLEND);
        GLESUtil.glesCheckError("glDisable");

        // Set the input texture
        int textureHandle = mTarget.getTextureHandle();
        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLESUtil.glesCheckError("glActiveTexture");
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle);
        GLESUtil.glesCheckError("glBindTexture");
        GLES20.glUniform1i(mTextureHandlers[0], 0);
        GLESUtil.glesCheckError("glBindTexture");

        // Texture
        FloatBuffer textureBuffer = mTarget.getTextureBuffer();
        textureBuffer.position(0);
        GLES20.glVertexAttribPointer(mTextureCoordHandlers[0], 2, GLES20.GL_FLOAT, false, 0, textureBuffer);
        GLESUtil.glesCheckError("glVertexAttribPointer");
        GLES20.glEnableVertexAttribArray(mTextureCoordHandlers[0]);
        GLESUtil.glesCheckError("glEnableVertexAttribArray");

        // Position
        float[] vertex = cloneVertex();
        float interpolation = mInterpolation.getInterpolation(delta);
        switch (mMode) {
            case LEFT_TO_RIGHT:
                vertex[1] -= interpolation * mAmount;
                vertex[5] += interpolation * mAmount;
                break;
            case RIGHT_TO_LEFT:
                vertex[3] -= interpolation * mAmount;
                vertex[7] += interpolation * mAmount;
                break;
            default:
                break;
        }
        ByteBuffer bb = ByteBuffer.allocateDirect(vertex.length * 4); // (# of coordinate values * 4 bytes per float)
        bb.order(ByteOrder.nativeOrder());
        FloatBuffer positionBuffer = bb.asFloatBuffer();
        positionBuffer.put(vertex);
        positionBuffer.position(0);
        GLES20.glVertexAttribPointer(mPositionHandlers[0], 2, GLES20.GL_FLOAT, false, 0, positionBuffer);
        GLESUtil.glesCheckError("glVertexAttribPointer");
        GLES20.glEnableVertexAttribArray(mPositionHandlers[0]);
        GLESUtil.glesCheckError("glEnableVertexAttribArray");

        // Calculate the delta angle and the translation and rotate parameters
        float angle = 0.0f;
        float translateX = 0.0f;
        float rotateY = 0.0f;
        switch (mMode) {
            case LEFT_TO_RIGHT:
                angle = delta * 90;
                rotateY = -1.0f;
                translateX = mTarget.getFrameVertex()[2] * -1;
                break;
            case RIGHT_TO_LEFT:
                angle = delta * -90;
                rotateY = -1.0f;
                translateX = mTarget.getFrameVertex()[0] * -1;
                break;

            default:
                break;
        }

        // Apply the projection and view transformation
        Matrix.setIdentityM(matrix, 0);
        Matrix.translateM(mTranslationMatrix, 0, matrix, 0, -translateX, 0.0f, 0.0f);
        Matrix.rotateM(mTranslationMatrix, 0, mTranslationMatrix, 0, angle, 0.0f, rotateY, 0.0f);
        Matrix.translateM(mTranslationMatrix, 0, mTranslationMatrix, 0, translateX, 0.0f, 0.0f);
        GLES20.glUniformMatrix4fv(mMVPMatrixHandlers[0], 1, false, mTranslationMatrix, 0);
        GLESUtil.glesCheckError("glUniformMatrix4fv");

        // Draw
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
        GLESUtil.glesCheckError("glDrawElements");

        // Disable attributes
        GLES20.glDisableVertexAttribArray(mPositionHandlers[0]);
        GLESUtil.glesCheckError("glDisableVertexAttribArray");
        GLES20.glDisableVertexAttribArray(mTextureCoordHandlers[0]);
        GLESUtil.glesCheckError("glDisableVertexAttribArray");
    }

    /**
     * Apply the destination transition (just draw the image)
     *
     * @param matrix The model-view-projection matrix
     */
    private void applyDstTransition(float[] matrix) {
        // Bind default FBO
        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
        GLESUtil.glesCheckError("glBindFramebuffer");

        // Use our shader program
        useProgram(1);

        // Disable blending
        GLES20.glDisable(GLES20.GL_BLEND);
        GLESUtil.glesCheckError("glDisable");

        // Apply the projection and view transformation
        GLES20.glUniformMatrix4fv(mMVPMatrixHandlers[1], 1, false, matrix, 0);
        GLESUtil.glesCheckError("glUniformMatrix4fv");

        // Texture
        FloatBuffer textureBuffer = mTransitionTarget.getTextureBuffer();
        textureBuffer.position(0);
        GLES20.glVertexAttribPointer(mTextureCoordHandlers[1], 2, GLES20.GL_FLOAT, false, 0, textureBuffer);
        GLESUtil.glesCheckError("glVertexAttribPointer");
        GLES20.glEnableVertexAttribArray(mTextureCoordHandlers[1]);
        GLESUtil.glesCheckError("glEnableVertexAttribArray");

        // Position
        FloatBuffer positionBuffer = mTransitionTarget.getPositionBuffer();
        positionBuffer.position(0);
        GLES20.glVertexAttribPointer(mPositionHandlers[1], 2, GLES20.GL_FLOAT, false, 0, positionBuffer);
        GLESUtil.glesCheckError("glVertexAttribPointer");
        GLES20.glEnableVertexAttribArray(mPositionHandlers[1]);
        GLESUtil.glesCheckError("glEnableVertexAttribArray");

        // Set the input texture
        int textureHandle = mTransitionTarget.getTextureHandle();
        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLESUtil.glesCheckError("glActiveTexture");
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle);
        GLESUtil.glesCheckError("glBindTexture");
        GLES20.glUniform1i(mTextureHandlers[1], 0);
        GLESUtil.glesCheckError("glUniform1i");

        // Draw
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
        GLESUtil.glesCheckError("glDrawElements");

        // Disable attributes
        GLES20.glDisableVertexAttribArray(mPositionHandlers[1]);
        GLESUtil.glesCheckError("glDisableVertexAttribArray");
        GLES20.glDisableVertexAttribArray(mTextureCoordHandlers[1]);
        GLESUtil.glesCheckError("glDisableVertexAttribArray");
    }

    /**
     * Method that copy the vertex array
     *
     * @return The copy of the vertex
     */
    private float[] cloneVertex() {
        float[] originalVertex = mTarget.getFrameVertex();
        float[] vertex = new float[originalVertex.length];
        System.arraycopy(originalVertex, 0, vertex, 0, originalVertex.length);
        return vertex;
    }

    /**
     * Return the scale amount to apply to the transition
     *
     * @return float The scale amount
     */
    private float getAmount() {
        return ((mTarget.getFrameWidth() * SCALE_AMOUNT) / 2);
    }
}