mirror of https://github.com/axmolengine/axmol.git
44 lines
1.2 KiB
GLSL
44 lines
1.2 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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void main()
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{
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vec4 sample = texture2D(CC_Texture0, v_texCoord);
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float fontAlpha = sample.a; // sample.a == 1 indicates text, a == 0 indicates outline
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float outlineAlpha = sample.r; // sample.r always > 0
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if (u_effectColor.a > 0.0) // draw outline
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{
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if (fontAlpha < 1.0)
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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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else
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{
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discard; // While drawing outline, text should not be drawn since it will be drawn in next step.
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// discard this pixel could improve a little and fix wrong alpha blending if text contains
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// alpha channel.
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}
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}
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else if (fontAlpha > 0.0) // 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 // discard the pixel in texture rectangle which is transparent
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{
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discard;
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}
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}
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)";
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