2 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <dali-toolkit/public-api/shader-effects/overlay-effect.h>
27 OverlayEffect::OverlayEffect()
31 OverlayEffect::~OverlayEffect()
35 OverlayEffect OverlayEffect::New( Image overlayImage )
37 // (Target > 0.5) * (1 - (1-2*(Target-0.5)) * (1-Blend)) + (Target <= 0.5) * ((2*Target) * Blend)
38 const char* OVERLAY_FRAGMENT_SHADER_SOURCE =
41 " lowp vec4 target = texture2D(sTexture, vTexCoord);\n"
42 " lowp vec4 overlay = texture2D(sEffect, vTexCoord);\n"
43 " if ( length( target.rgb ) > 0.5 )\n"
45 " gl_FragColor = vec4( mix( target.rgb, 1.0 - ( 1.0 - 2.0 * ( target.rgb - 0.5 ) ) * ( 1.0 - overlay.rgb ), overlay.a ), min( 1.0, target.a + overlay.a ) );\n"
49 " gl_FragColor = vec4( mix( target.rgb, 2.0 * target.rgb * overlay.rgb, overlay.a ), target.a + overlay.a );\n"
53 ShaderEffect shader = ShaderEffect::New( "", // Use default
54 OVERLAY_FRAGMENT_SHADER_SOURCE,
55 GeometryType( GEOMETRY_TYPE_IMAGE ),
56 ShaderEffect::GeometryHints( ShaderEffect::HINT_BLENDING ) );
58 shader.SetEffectImage( overlayImage );
60 return OverlayEffect( shader );
63 //Call the Parent copy constructor to add reference to the implementation for this object
64 OverlayEffect::OverlayEffect( ShaderEffect handle )
65 : ShaderEffect( handle )
69 } // namespace Toolkit