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graphics: Accurate calculation of vbo values

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This commit is contained in:
Hajime Hoshi 2016-10-23 03:37:21 +09:00
parent 79e763da35
commit 8219c56dd8
1 changed files with 8 additions and 7 deletions
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15
imageparts.go
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@ -84,9 +84,10 @@ type textureQuads struct {
}
func (t *textureQuads) vertices() []uint8 {
size := graphics.QuadVertexSizeInBytes()
totalSize := graphics.QuadVertexSizeInBytes()
oneSize := totalSize / 4
l := t.parts.Len()
vertices := make([]uint8, l*size)
vertices := make([]uint8, l*totalSize)
p := t.parts
w, h := t.width, t.height
width2p := graphics.NextPowerOf2Int(w)
@ -123,16 +124,16 @@ func (t *textureQuads) vertices() []uint8 {
// Use direct assign here. `append` function might be slow on browsers.
if endian.IsLittle() {
for i, v := range vs {
vertices[size*n+2*i] = uint8(v)
vertices[size*n+2*i+1] = uint8(v >> 8)
vertices[totalSize*n+oneSize*(i/4)+2*(i%4)] = uint8(v)
vertices[totalSize*n+oneSize*(i/4)+2*(i%4)+1] = uint8(v >> 8)
}
} else {
for i, v := range vs {
vertices[size*n+2*i] = uint8(v >> 8)
vertices[size*n+2*i+1] = uint8(v)
vertices[totalSize*n+oneSize*(i/4)+2*(i%4)] = uint8(v >> 8)
vertices[totalSize*n+oneSize*(i/4)+2*(i%4)+1] = uint8(v)
}
}
n++
}
return vertices[:n*size]
return vertices[:n*totalSize]
}