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/*
* Copyright (C) 2013 Jorge Ruesga
*
* 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.ruesga.android.wallpapers.photophase.transitions;
import android.content.Context;
import android.opengl.GLES20;
import android.opengl.GLException;
import com.ruesga.android.wallpapers.photophase.utils.GLESUtil;
import com.ruesga.android.wallpapers.photophase.PhotoFrame;
import com.ruesga.android.wallpapers.photophase.R;
import com.ruesga.android.wallpapers.photophase.TextureManager;
import com.ruesga.android.wallpapers.photophase.transitions.Transitions.TRANSITIONS;
import java.nio.FloatBuffer;
/**
* A special transition that does nothing other than draw the {@link PhotoFrame}
* on the screen continually. No transition is done.
*/
public class NullTransition extends Transition {
private static final int[] VERTEX_SHADER = {R.raw.default_vertex_shader};
private static final int[] FRAGMENT_SHADER = {R.raw.default_fragment_shader};
/**
* Constructor of <code>NullTransition</code>
*
* @param ctx The current context
* @param tm The texture manager
*/
public NullTransition(Context ctx, TextureManager tm) {
super(ctx, tm, VERTEX_SHADER, FRAGMENT_SHADER);
}
/**
* {@inheritDoc}
*/
@Override
public void select(PhotoFrame target) {
super.select(target);
}
/**
* {@inheritDoc}
*/
@Override
public TRANSITIONS getType() {
return TRANSITIONS.NO_TRANSITION;
}
/**
* {@inheritDoc}
*/
@Override
public boolean hasTransitionTarget() {
return false;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isRunning() {
return mTarget == null || !mTarget.isLoaded();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isSelectable(PhotoFrame frame) {
return true;
}
/**
* {@inheritDoc}
*/
@Override
public void reset() {
// Nothing to do
}
/**
* {@inheritDoc}
*/
@Override
public void apply(float[] matrix) throws GLException {
// Check internal vars
if (mTarget == null ||
mTarget.getPositionBuffer() == null ||
mTarget.getTextureBuffer() == null) {
return;
}
// Draw the current target
draw(mTarget, matrix);
}
/**
* Method that draws the picture texture
*
* @param target The target to draw
* @param matrix The model-view-projection matrix
*/
protected void draw(PhotoFrame target, float[] matrix) {
// Bind default FBO
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
GLESUtil.glesCheckError("glBindFramebuffer");
// Use our shader program
useProgram(0);
// Disable blending
GLES20.glDisable(GLES20.GL_BLEND);
GLESUtil.glesCheckError("glDisable");
// Apply the projection and view transformation
GLES20.glUniformMatrix4fv(mMVPMatrixHandlers[0], 1, false, matrix, 0);
GLESUtil.glesCheckError("glUniformMatrix4fv");
// Texture
FloatBuffer textureBuffer = target.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
FloatBuffer positionBuffer = target.getPositionBuffer();
positionBuffer.position(0);
GLES20.glVertexAttribPointer(mPositionHandlers[0], 2, GLES20.GL_FLOAT, false, 0, positionBuffer);
GLESUtil.glesCheckError("glVertexAttribPointer");
GLES20.glEnableVertexAttribArray(mPositionHandlers[0]);
GLESUtil.glesCheckError("glEnableVertexAttribArray");
// Set the input texture
int textureHandle = target.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("glUniform1i");
// 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");
}
}
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