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PO
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Id
14315170
data
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0
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0
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4
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CreationDate
2013-01-14T08:34:39.337
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2013-01-14T08:34:39.337
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LastEditorUserId
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1954376
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14192330
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2
Score
3
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0
LastEditorDisplayName
text
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I've managed to fix this issue. The problem is in Mali gpu. Mali doesn't support high precision float calculations in fragment shader. When distance from center to point was near zero - r variable became zero. So I've added constant coefficient to my calculations and this did the trick. Here is working fragment shader: <pre><code>precision mediump float; varying lowp vec4 v_color; varying vec2 v_texCoords; uniform sampler2D u_texture; const float PI = 3.14159; const float koef = 10.0; void main() { vec2 uv; vec2 m = vec2(0.622 , 0.4985); // lens center point, note that in live wallpaper center of texture is (0.5,0.5) float lensSize = 0.045; //radius of lens float lensCut = 0.0342; //height of cut float cuttop = m.y + lensCut; float cutbottom = m.y - lensCut; float cutleft = m.x-lensSize; float cutright = m.x+lensSize; //don't transform pixels, that aren't in lens area if ( v_texCoords.y >= cuttop) { uv = v_texCoords; } else if (v_texCoords.y <= cutbottom) { uv = v_texCoords; } else if (v_texCoords.x <= cutleft) { uv = v_texCoords; } else if (v_texCoords.x >= cutright) { uv = v_texCoords; } else { vec2 p = v_texCoords*koef; //current point vec2 d = p - m*koef; //vector differnce between current point and center point float r = distance(m*koef,p); // distance of pixel from center if (r/koef >= lensSize) { uv = v_texCoords; } else { uv =m + normalize(d) * asin(r) / (PI*0.37*koef); } } gl_FragColor = texture2D(u_texture, uv); } </code></pre>
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1. POlibgdx: SpriteBatch, fragment shader on Samsung Android devices work incorrect
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1. PTAnswer
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1. This table or related slice is empty.
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1. USAlexander Semenov
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1. POlibgdx: SpriteBatch, fragment shader on Samsung Android devices work incorrect
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1. VO
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