/*
* Copyright (C) 2016 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.borders;
import android.media.effect.EffectContext;
import android.opengl.GLES20;
import android.util.Log;
import com.ruesga.android.wallpapers.photophase.utils.GLESUtil;
/**
* This elegant border around the texture.<br/>
* <table>
* <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr>
* </table>
*/
public class ElegantBorder extends Border {
private static final String TAG = "ElegantBorder";
public static final String STRENGTH_PARAMETER = "strength";
public static final String COLOR_PARAMETER = "color";
public static final String BGCOLOR_PARAMETER = "bgcolor";
private static final String FRAGMENT_SHADER =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler;\n" +
"uniform float w;\n" +
"uniform float h;\n" +
"uniform vec4 color;\n" +
"uniform vec4 bgcolor;\n" +
"uniform float strength;\n" +
"varying vec2 v_texcoord;\n" +
"bool is_border(vec2 p, float b) {\n" +
" return p.x < (0.0 + b)\n" +
" || p.x > (1.0 - b)\n" +
" || p.y < (0.0 + b)\n" +
" || p.y > (1.0 - b);\n" +
"}\n" +
"bool is_rounded_border(vec2 p, vec2 c, float r) {\n" +
" float dx = (c.x - p.x);\n" +
" float dy = (c.y - p.y);\n" +
" dx *= dx;\n" +
" dy *= dy;\n" +
" return (dx + dy) <= (r * r);\n" +
"}\n" +
"bool is_square_border(vec2 p, float b) {\n" +
" return (p.x < (0.0 + b*2.0) && p.y > (1.0 - b*2.0))\n" +
" || (p.x > (1.0 - b*2.0) && p.y > (1.0 - b*2.0))\n" +
" || (p.x < (0.0 + b*2.0) && p.y < (0.0 + b*2.0))\n" +
" || (p.x > (1.0 - b*2.0) && p.y < (0.0 + b*2.0));\n" +
"}\n" +
"void main(void)\n" +
"{\n" +
" float b = min(strength / w, strength / h);\n" +
" vec2 clt = vec2(0.0, 1.0);\n" +
" vec2 crt = vec2(1.0, 1.0);\n" +
" vec2 clb = vec2(0.0, 0.0);\n" +
" vec2 crb = vec2(1.0, 0.0);\n" +
" if (is_rounded_border(v_texcoord, clt, b)\n" +
" || is_rounded_border(v_texcoord, crt, b)\n" +
" || is_rounded_border(v_texcoord, crb, b)\n" +
" || is_rounded_border(v_texcoord, clb, b)) {\n" +
" gl_FragColor = bgcolor;\n" +
" }\n" +
" else if (is_border(v_texcoord, b) || is_square_border(v_texcoord, b)) {\n" +
" vec4 tex = texture2D (tex_sampler, v_texcoord);\n" +
" float r = tex.r + (color.r - tex.r) * color.a;\n" +
" float g = tex.g + (color.g - tex.g) * color.a;\n" +
" float b = tex.b + (color.b - tex.b) * color.a;\n" +
" gl_FragColor = vec4(r, g, b, tex.a);\n" +
" } else {\n" +
" gl_FragColor = texture2D(tex_sampler, v_texcoord);\n" +
" }\n" +
"}";
private float mStrength = 25;
private final int mColorHandle;
private final int mBgColorHandle;
private final int mWidthHandle;
private final int mHeightHandle;
private final int mStrengthHandle;
/**
* Constructor of <code>RoundedBorder</code>.
*
* @param ctx The effect context
* @param name The effect name
*/
public ElegantBorder(EffectContext ctx, String name) {
super(ctx, ElegantBorder.class.getName());
init(VERTEX_SHADER, FRAGMENT_SHADER);
// Parameters
mWidthHandle = GLES20.glGetUniformLocation(mProgram[0], "w");
GLESUtil.glesCheckError("glGetUniformLocation");
mHeightHandle = GLES20.glGetUniformLocation(mProgram[0], "h");
GLESUtil.glesCheckError("glGetUniformLocation");
mStrengthHandle = GLES20.glGetUniformLocation(mProgram[0], STRENGTH_PARAMETER);
GLESUtil.glesCheckError("glGetUniformLocation");
mColorHandle = GLES20.glGetUniformLocation(mProgram[0], COLOR_PARAMETER);
GLESUtil.glesCheckError("glGetUniformLocation");
mBgColorHandle = GLES20.glGetUniformLocation(mProgram[0], BGCOLOR_PARAMETER);
GLESUtil.glesCheckError("glGetUniformLocation");
}
/**
* {@inheritDoc}
*/
@Override
void applyParameters(int width, int height) {
// Set parameters
GLES20.glUniform1f(mWidthHandle, (float) width);
GLESUtil.glesCheckError("glUniform1f");
GLES20.glUniform1f(mHeightHandle, (float) height);
GLESUtil.glesCheckError("glUniform1f");
GLES20.glUniform1f(mStrengthHandle, mStrength);
GLESUtil.glesCheckError("glUniform1f");
GLES20.glUniform4fv(mColorHandle, 1, mColor.asVec4(), 0);
GLESUtil.glesCheckError("glUniform4fv");
GLES20.glUniform4fv(mBgColorHandle, 1, mBgColor.asVec4(), 0);
GLESUtil.glesCheckError("glUniform4fv");
}
/**
* {@inheritDoc}
*/
@Override
public void setParameter(String parameterKey, Object value) {
if (parameterKey.compareTo(STRENGTH_PARAMETER) == 0) {
try {
float strength = Float.parseFloat(value.toString());
if (strength < 0) {
Log.w(TAG, "strength parameter must be > 0");
return;
}
mStrength = strength;
} catch (NumberFormatException ex) {
// Ignore
}
}
}
}