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Shaders: Prefer arithmetic conditionals to branching

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This commit is contained in:
Jonas Kulla 2014-12-23 19:00:14 +01:00
parent 373b90af00
commit 2f95c0613a
2 changed files with 8 additions and 6 deletions
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5
shader/tilemap.vert
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@ -18,8 +18,9 @@ const float atAniOffset = 32.0*3.0;
void main()
{
vec2 tex = texCoord;
if (tex.x <= atAreaW && tex.y <= atAreaH)
tex.x += aniIndex * atAniOffset;
lowp float pred = float(tex.x <= atAreaW && tex.y <= atAreaH);
tex.x += aniIndex * atAniOffset * pred;
gl_Position = projMat * vec4(position + translation, 0, 1);