Christian (@austriancoder.bsky.social)

Christian

@austriancoder.bsky.social

Pinned

@austriancoder.bsky.social

New post: Fixing the R/B swap the right way 🔴🔵 Vivante GPUs always write pixels BGRA. etnaviv fixed it in the shader — until it crashed. The blob had a simpler trick. Then dmabuf broke the whole thing. A story about where you fix byte order. christian-gmeiner.info/2026-06-10-f...

christian-gmeiner.infoFixing the R/B swap the right wayIf you’ve ever looked at a GPU render and seen blue where red should be, you’ve met the R/B swap problem. For etnaviv this has been a long-standing source of complexity. We were solving it in the shad...

Christian

@austriancoder.bsky.social

19 June

New post: The Diagonal Seam 📐 u_blitter copies pixels with a textured quad - two triangles, one diagonal seam. With NEAREST filtering that seam becomes a stripe of wrong texels. The fix: don't draw a quad. christian-gmeiner.info/2026-06-19-t...

christian-gmeiner.infoThe Diagonal SeamTwo more dEQP tests down: dEQP-GLES3.functional.fbo.blit.rect.nearest_consistency_mag -- Pass dEQP-GLES3.functional.fbo.blit.rect.nearest_consistency_min -- Pass This one was a fun geometry puzzle. Th...

Christian

@austriancoder.bsky.social

20 Apr

New post: PanVK Extension Sprint - Mesa 26.1 🚀 18 Vulkan extensions landed in PanVK for Mesa 26.1 - driven by DXVK/vkd3d-proton needs, DDK parity, and mesamatrix gaps. PanVK is getting to the point where you can throw a DXVK game at it and expect it to work. christian-gmeiner.info/2026-04-20-p...

christian-gmeiner.infoPanVK Extension Sprint: Mesa 26.1Last week marks the Mesa 26.1 branch point, and I wanted to take a moment to look back at what happened on the PanVK front. Spoiler: it was a busy one. The landscape PanVK - the Vulkan driver for Arm ...

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