mirror of https://github.com/axmolengine/axmol.git
49 lines
1.4 KiB
GLSL
49 lines
1.4 KiB
GLSL
/*
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* LICENSE ???
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*/
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const char* ccLabelOutline_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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#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(CC_Texture0, 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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