47 lines
1.3 KiB
GLSL
47 lines
1.3 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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precision mediump int;
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#endif
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uniform float EW_sizeBorder;
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uniform float EW_sizePadding;
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uniform vec2 EW_size;
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uniform vec4 EW_posText;
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uniform int EW_state;
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// transmit from the vertex shader
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varying vec2 v_position; // interpolated position ...
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// internal static define
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float S_roundedRatio = 10.0;
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vec4 S_colorBg = vec4(0.0);
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vec4 S_colorFg = vec4(1.0,1.0,1.0,0.8);
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vec4 S_colorBorder = vec4(0.0,0.0,0.0,1.0);
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void main(void) {
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// position form center :
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vec2 ratio = EW_size / 2.0;
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vec2 positionCenter = abs(v_position-ratio);
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vec2 ratioHight = ratio - EW_sizePadding;
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vec2 ratioLow = ratioHight - (EW_sizeBorder+S_roundedRatio);
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vec2 circleMode = smoothstep(ratioLow, ratioHight, positionCenter);
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float tmpDist = sqrt(dot(circleMode,circleMode));
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//float distanceInternal = (S_roundedRatio-EW_sizeBorder/2.0)/(S_roundedRatio-EW_sizeBorder);
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//float distanceExternal = (S_roundedRatio+EW_sizeBorder/2.0)/(S_roundedRatio-EW_sizeBorder);;
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if(tmpDist <= 0.7 ) {
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gl_FragColor = S_colorFg;
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} else if(tmpDist <= 0.9) {
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float tmpVal = smoothstep(0.7, 0.9, tmpDist);
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if (tmpVal<=0.5) {
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gl_FragColor = S_colorBorder*(tmpVal*2.0) + S_colorFg*(1.0-tmpVal*2.0);
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} else {
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gl_FragColor = S_colorBorder*(1.0-(tmpVal-0.5)*2.0) + S_colorBg*((tmpVal-0.5)*2.0);
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}
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} else {
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gl_FragColor = S_colorBg;
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}
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}
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