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38 lines
992 B
GLSL
38 lines
992 B
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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attribute vec4 a_position;
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attribute vec2 a_texcoord0;
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uniform vec2 u_texelDelta;
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uniform vec2 u_pixelDelta;
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varying vec4 v_texcoord0;
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varying vec4 v_texcoord1;
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varying vec4 v_texcoord2;
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varying vec4 v_texcoord3;
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varying vec4 v_texcoord4;
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varying vec4 v_texcoord5;
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varying vec4 v_texcoord6;
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void main()
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{
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float x = u_pixelDelta.x*((u_texelDelta.x/u_pixelDelta.x)/2.0);
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float y = u_pixelDelta.y*((u_texelDelta.y/u_pixelDelta.y)/2.0);
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vec2 dg1 = vec2( x,y);
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vec2 dg2 = vec2(-x,y);
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vec2 sd1 = dg1*0.5;
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vec2 sd2 = dg2*0.5;
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gl_Position = a_position;
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v_texcoord0=a_texcoord0.xyxy;
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v_texcoord1.xy = v_texcoord0.xy - sd1;
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v_texcoord2.xy = v_texcoord0.xy - sd2;
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v_texcoord3.xy = v_texcoord0.xy + sd1;
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v_texcoord4.xy = v_texcoord0.xy + sd2;
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v_texcoord5.xy = v_texcoord0.xy - dg1;
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v_texcoord6.xy = v_texcoord0.xy + dg1;
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v_texcoord5.zw = v_texcoord0.xy - dg2;
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v_texcoord6.zw = v_texcoord0.xy + dg2;
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}
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