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internal/graphics: optimize imageSrcNUnsafeAt

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This commit is contained in:
Hajime Hoshi 2022-07-11 01:06:07 +09:00
parent b27b7ec483
commit b8367da7e2
1 changed files with 3 additions and 5 deletions
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8
internal/graphics/shader.go
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@ -93,11 +93,9 @@ func imageSrc%[1]dUnsafeAt(pos vec2) vec4 {
func imageSrc%[1]dAt(pos vec2) vec4 { func imageSrc%[1]dAt(pos vec2) vec4 {
// pos is the position in texels of the source texture (= 0th image's texture). // pos is the position in texels of the source texture (= 0th image's texture).
return texture2D(__t%[1]d, %[2]s) * // If pos is in the region, the result is (1, 1). Otherwise, either element is 0.
step(__textureSourceRegionOrigin.x, pos.x) * in := step(__textureSourceRegionOrigin, pos) - step(__textureSourceRegionOrigin + __textureSourceRegionSize, pos)
(1 - step(__textureSourceRegionOrigin.x + __textureSourceRegionSize.x, pos.x)) * return texture2D(__t%[1]d, %[2]s) * in.x * in.y
step(__textureSourceRegionOrigin.y, pos.y) *
(1 - step(__textureSourceRegionOrigin.y + __textureSourceRegionSize.y, pos.y))
} }
`, i, pos) `, i, pos)
} }