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- make the warp2 shader's formula match the software renderer's.

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This fixes some jerkiness with vertical scrollers due to a bad sine period and makes the overall appearance of the effect what it was originally supposed to be. The old warp2 shader was not created by replicating the formula but by trial and error until it looked close enough.

A version of the old warp2 shader with a fixed sine period is still available as a custom hardware shader.
This commit is contained in:
Christoph Oelckers 2016-05-04 13:47:40 +02:00
parent 54571beaca
commit 9f91fa8f43
2 changed files with 21 additions and 4 deletions
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7
wadsrc/static/shaders/glsl/func_warp2.fp
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@ -7,11 +7,10 @@ vec4 ProcessTexel()
const float pi = 3.14159265358979323846;
vec2 offset = vec2(0.0,0.0);
float siny = sin(pi * 2.0 * (texCoord.y * 2.2 + timer * 0.75)) * 0.03;
offset.y = siny + sin(pi * 2.0 * (texCoord.x * 0.75 + timer * 0.75)) * 0.03;
offset.x = siny + sin(pi * 2.0 * (texCoord.x * 1.1 + timer * 0.45)) * 0.02;
offset.y = 0.5 + sin(pi * 2.0 * (texCoord.y + timer * 0.61 + 900.0/8192.0)) + sin(pi * 2.0 * (texCoord.x * 2.0 + timer * 0.36 + 300.0/8192.0));
offset.x = 0.5 + sin(pi * 2.0 * (texCoord.y + timer * 0.49 + 700.0/8192.0)) + sin(pi * 2.0 * (texCoord.x * 2.0 + timer * 0.49 + 1200.0/8192.0));
texCoord += offset;
texCoord += offset * 0.025;
return getTexel(texCoord);
}

18
wadsrc/static/shaders/glsl/func_warp3.fp Normal file
View file

@ -0,0 +1,18 @@
uniform float timer;
vec4 ProcessTexel()
{
vec2 texCoord = vTexCoord.st;
const float pi = 3.14159265358979323846;
vec2 offset = vec2(0.0,0.0);
float siny = sin(pi * 2.0 * (texCoord.y * 2.0 + timer * 0.75)) * 0.03;
offset.y = siny + sin(pi * 2.0 * (texCoord.x + timer * 0.75)) * 0.03;
offset.x = siny + sin(pi * 2.0 * (texCoord.x + timer * 0.45)) * 0.02;
texCoord += offset;
return getTexel(texCoord);
}