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annotate shaders/sharp.f.glsl @ 1977:f3cca4b3f17a

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Allow use of NPOT textures as a config option. Useful for some mobile GPUs
author Michael Pavone <pavone@retrodev.com>
date Sat, 09 May 2020 21:15:33 -0700
parents be1da0a68d1e
children
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1856
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1
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2 uniform sampler2D textures[2];
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3 uniform mediump vec2 texsize;
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4
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5 varying mediump vec2 texcoord;
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6
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7 void main()
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8 {
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9 mediump float x0 = (floor(texcoord.x * texsize.x - 0.25) + 0.5)/texsize.x;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1856
diff changeset
10 mediump float x1 = (floor(texcoord.x * texsize.x + 0.25) + 0.5)/texsize.x;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1856
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11 mediump float y0 = (floor(texcoord.y * texsize.y + 0.25) + 0.5)/texsize.y;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1856
diff changeset
12 mediump float y1 = (floor(texcoord.y * texsize.y - 0.25) + 0.5)/texsize.y;
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13
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f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
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parents: 1856
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14 mediump float ymix = (sin(texcoord.y * texsize.y * 6.283185307) + 1.0) * 0.5;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
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15 mediump float xmix = (sin(texcoord.x * texsize.x * 6.283185307) + 1.0) * 0.5;
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16 gl_FragColor = mix(
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17 mix(
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18 texture2D(textures[1], vec2(x0, y1)),
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19 texture2D(textures[0], vec2(x0, y0)),
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20 ymix
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21 ),
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22 mix(
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23 texture2D(textures[1], vec2(x1, y1)),
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24 texture2D(textures[0], vec2(x1, y0)),
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25 ymix
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26 ),
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27 xmix
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28 );
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29 }