mirror of https://github.com/axmolengine/axmol.git
74 lines
2.7 KiB
GLSL
74 lines
2.7 KiB
GLSL
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/****************************************************************************
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Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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/*
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* LICENSE ???
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*/
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const char* labelOutline_frag = R"(
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#ifdef GL_ES
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precision lowp float;
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#endif
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varying vec4 v_fragmentColor;
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varying vec2 v_texCoord;
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uniform vec4 u_effectColor;
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uniform vec4 u_textColor;
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uniform sampler2D u_texture;
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#ifdef GL_ES
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uniform lowp int u_effectType; // 0: None (Draw text), 1: Outline, 2: Shadow
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#else
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uniform int u_effectType;
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#endif
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void main()
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{
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vec4 sample = texture2D(u_texture, v_texCoord);
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// fontAlpha == 1 means the area of solid text (without edge)
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// fontAlpha == 0 means the area outside text, including outline area
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// fontAlpha == (0, 1) means the edge of text
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float fontAlpha = sample.a;
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// outlineAlpha == 1 means the area of 'solid text' and 'solid outline'
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// outlineAlpha == 0 means the transparent area outside text and outline
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// outlineAlpha == (0, 1) means the edge of outline
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float outlineAlpha = sample.r;
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if (u_effectType == 0) // draw text
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{
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gl_FragColor = v_fragmentColor * vec4(u_textColor.rgb, u_textColor.a * fontAlpha);
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}
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else if (u_effectType == 1) // draw outline
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{
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// multipy (1.0 - fontAlpha) to make the inner edge of outline smoother and make the text itself transparent.
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gl_FragColor = v_fragmentColor * vec4(u_effectColor.rgb, u_effectColor.a * outlineAlpha * (1.0 - fontAlpha));
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}
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else // draw shadow
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{
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gl_FragColor = v_fragmentColor * vec4(u_effectColor.rgb, u_effectColor.a * outlineAlpha);
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}
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}
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)";
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