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\n\tMon, 06 Jul 2026 04:01:30 -0700 (PDT)","From":"Bryan O'Donoghue ","To":"libcamera-devel@lists.libcamera.org","Cc":"bryan.odonoghue@linaro.org,\n\tpavel@ucw.cz","Subject":"[PATCH v4 0/7] libcamera: software_isp: gpu: Add go faster stripes","Date":"Mon, 6 Jul 2026 12:01:13 +0100","Message-ID":"<20260706110120.2509826-1-bryan.odonoghue@linaro.org>","X-Mailer":"git-send-email 2.54.0","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"v4:\n- Sizes cache as indicated at configure\n- Ejects oldest entry on cache miss if cache is full. This allows an external\n application to keep feeding buffers in.\n- Reverts to using per image dma-buf flags - this is because again we can\n have heterogeneous sources of buffers.\n- Takes Barnabas' suggested SharedFD patch - Robert\n- Accumulates RB as indicated by Milan\n\nLink: https://gitlab.freedesktop.org/camera/libcamera-softisp/-/pipelines/1700354\n\nv3:\n- Fixes a missing switch default from libcamera ci loop - bod\n\nv2:\n- Reverts to debayer_egl specific caching mechanism - Laurent\n- Pivots on dmabuf handle as key for cache. dmabuf handle\n must be unique between start() and stop() for eglCreateImageKHR to work - Barnabas\n- Ensures sizeof cache doesn't exceed the number of expected buffers\n as discovered during configure() - Barnabas\n- Drops GL_16F patch - Robert\n- Drops the \"input\" name from createInputTexture2D() - Robert\n- Adds RB as specified by Robert\n\nv1:\nFollowing on from Robert Mader's ask to bring forward GPUISP multi-pass\ncache operations to mainline first, I've done some work to enable that.\n\nThis series implements an input/output texture caching scheme which results\nin an overall absolute 4.5 millisecond - roughly improvement in performance\nper processed frame. This is a bit of an odd result as I was expecting to\nshave a particular % off of each frame in the order of 20% or so. My best\nguess is that particular paths we are optimising here are around texture\ngeneration and these are \"fixed costs\" on the CPU side.\n\nOne very welcome outcome of this series is genuine zero-copy on dma-buf\npaths we can support it on i.e. on paths where the CSI2 and GPU strides\nagree.\n\nThe numbers cited in my example are for non dma-buf handle upload and\ndma-buf handle render-to-texture on the output so, in fact I'd expect to\nsee a much larger improvement on systems where dma-buf handle is used on\nboth paths.\n\nAs it is on my test reference systems I have a 50% improvement per frame\nfor one system, a 20% improvement on another system or we could view it as\na fixed 4.5 millisecond improvement on both.\n\nI implemented the cache around V4L2BufferCache as per Barnabas' suggestion,\nincluding a fixed cache size.\n\nBryan O'Donoghue (6):\n libcamera: software_isp: debayer_egl: Pass eglImage as parameter to\n setShaderVariables\n libcamera: egl: Add new helper attachTextureToFBO\n libcamera: egl: Add createOutputTexture2D\n libcamera: egl: Add updateTexture2D\n libcamera: egl: Add activateBindTexture\n libcamera: software_isp: debayer_egl: Implement input/output frame\n caching mechanism\n\nRobert Mader (1):\n libcamera: base: shared_fd: Add hash template\n\n Documentation/Doxyfile-common.in | 2 +\n include/libcamera/base/shared_fd.h | 9 ++\n include/libcamera/internal/egl.h | 5 +\n src/libcamera/egl.cpp | 97 ++++++++++++++---\n src/libcamera/software_isp/debayer_egl.cpp | 116 +++++++++++++++------\n src/libcamera/software_isp/debayer_egl.h | 15 ++-\n 6 files changed, 195 insertions(+), 49 deletions(-)"}