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gpu,gpu/internal: support variable strides in ReadPixels

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It saves a roundtrip to scratch memory when the CPU fallback renderer
downloads rendered materials.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-08-26 19:18:29 +02:00
parent 06ffa42d16
commit 7f6e376424
6 changed files with 25 additions and 23 deletions
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gpu/internal/metal/metal_darwin.go
+1 -2
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@@ -1121,7 +1121,7 @@ func (b *Buffer) Release() {
*b = Buffer{}
}
func (f *Framebuffer) ReadPixels(src image.Rectangle, pixels []byte) error {
func (f *Framebuffer) ReadPixels(src image.Rectangle, pixels []byte, stride int) error {
if len(pixels) == 0 {
return nil
}
@@ -1135,7 +1135,6 @@ func (f *Framebuffer) ReadPixels(src image.Rectangle, pixels []byte) error {
height: C.NSUInteger(sz.Y),
depth: 1,
}
stride := 4 * sz.X
buf, off := f.backend.stagingBuffer(len(pixels))
enc := f.backend.startBlit()
C.blitEncCopyTextureToBuffer(enc, f.texture, buf, C.NSUInteger(off), C.NSUInteger(stride), C.NSUInteger(len(pixels)), msize, orig)