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examples/shader: bug fix: wrong usages of position

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Closes #2638
Updates #1431
This commit is contained in:
Hajime Hoshi
2023-04-13 01:48:56 +09:00
parent ebbd0fc07d
commit 2d6e13cda4
3 changed files with 22 additions and 13 deletions
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6
examples/shader/lighting.go
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@@ -21,8 +21,12 @@ var Cursor vec2
var ScreenSize vec2
func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
srcOrigin, srcSize := imageSrcRegionOnTexture()
pos := (texCoord - srcOrigin) / srcSize
pos *= ScreenSize
lightpos := vec3(Cursor, 50)
lightdir := normalize(lightpos - position.xyz)
lightdir := normalize(lightpos - vec3(pos, 0))
normal := normalize(imageSrc1UnsafeAt(texCoord) - 0.5)
const ambient = 0.25
diffuse := 0.75 * max(0.0, dot(normal.xyz, lightdir))