1 #ifndef __DALI_TOOLKIT_ALPHA_DISCARD_EFFECT_H__
2 #define __DALI_TOOLKIT_ALPHA_DISCARD_EFFECT_H__
5 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/shader-effects/shader-effect.h>
31 * @brief Creates a new Alpha discard effect
33 * Alpha discard effect is used to discard fragments when the alpha colour value is below a threshold.
34 * This is useful for stenciling.
38 * ImageActor actor = ImageActor::New( Image( EXAMPLE_IMAGE_PATH ) );
39 * ShaderEffect alphaDiscardEffect = CreateAlphaDiscardEffect();
40 * actor.SetShaderEffect( alphaDiscardEffect );
42 * @return A handle to a newly allocated ShaderEffect.
44 inline ShaderEffect CreateAlphaDiscardEffect()
46 const char* ALPHA_DISCARD_FRAGMENT_SHADER_SOURCE =
49 " mediump vec4 color = texture2D( sTexture, vTexCoord ); \n"
50 " if(color.a <= 0.0001) \n"
54 " gl_FragColor = color * uColor; \n"
57 return ShaderEffect::New( "", // Use default
58 ALPHA_DISCARD_FRAGMENT_SHADER_SOURCE );
61 } // namespace Toolkit
65 #endif // __DALI_TOOLKIT_ALPHA_DISCARD_EFFECT_H__