{"id":24684,"url":"https://patchwork.libcamera.org/api/patches/24684/?format=json","web_url":"https://patchwork.libcamera.org/patch/24684/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20251015012251.17508-40-bryan.odonoghue@linaro.org>","date":"2025-10-15T01:22:51","name":"[v3,39/39] libcamera: software_isp: Add a gpuisp todo list","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"f01a647225d31b1e58537e0a907e0236cc568a95","submitter":{"id":175,"url":"https://patchwork.libcamera.org/api/people/175/?format=json","name":"Bryan O'Donoghue","email":"bryan.odonoghue@linaro.org"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/24684/mbox/","series":[{"id":5503,"url":"https://patchwork.libcamera.org/api/series/5503/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5503","date":"2025-10-15T01:22:12","name":"Add GLES 2.0 GPUISP to libcamera","version":3,"mbox":"https://patchwork.libcamera.org/series/5503/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/24684/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/24684/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 96ACDC3331\n\tfor ;\n\tWed, 15 Oct 2025 01:23:49 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0ECDD60693;\n\tWed, 15 Oct 2025 03:23:49 +0200 (CEST)","from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com\n\t[IPv6:2a00:1450:4864:20::62c])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 40EE460677\n\tfor ;\n\tWed, 15 Oct 2025 03:23:35 +0200 (CEST)","by mail-ej1-x62c.google.com with SMTP id\n\ta640c23a62f3a-b48d8deafaeso1242439466b.1\n\tfor ;\n\tTue, 14 Oct 2025 18:23:35 -0700 (PDT)","from inspiron14p-linux.nxsw.local (188-141-3-146.dynamic.upc.ie.\n\t[188.141.3.146]) by smtp.gmail.com with ESMTPSA id\n\ta640c23a62f3a-b5ccd7b202dsm98348466b.82.2025.10.14.18.23.33\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tTue, 14 Oct 2025 18:23:33 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tTue, 14 Oct 2025 18:23:34 -0700 (PDT)","From":"Bryan O'Donoghue ","To":"libcamera-devel@lists.libcamera.org","Cc":"hdegoede@redhat.com, mzamazal@redhat.com, bryan.odonoghue@linaro.org,\n\tbod.linux@nxsw.ie","Subject":"[PATCH v3 39/39] libcamera: software_isp: Add a gpuisp todo list","Date":"Wed, 15 Oct 2025 02:22:51 +0100","Message-ID":"<20251015012251.17508-40-bryan.odonoghue@linaro.org>","X-Mailer":"git-send-email 2.51.0","In-Reply-To":"<20251015012251.17508-1-bryan.odonoghue@linaro.org>","References":"<20251015012251.17508-1-bryan.odonoghue@linaro.org>","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":"List the series of things to do in GPU ISP in perceived order of\ndifficulty.\n\nSigned-off-by: Bryan O'Donoghue \n---\n src/libcamera/software_isp/gpuisp-todo.txt | 83 ++++++++++++++++++++++\n 1 file changed, 83 insertions(+)\n create mode 100644 src/libcamera/software_isp/gpuisp-todo.txt","diff":"diff --git a/src/libcamera/software_isp/gpuisp-todo.txt b/src/libcamera/software_isp/gpuisp-todo.txt\nnew file mode 100644\nindex 00000000..768dcc32\n--- /dev/null\n+++ b/src/libcamera/software_isp/gpuisp-todo.txt\n@@ -0,0 +1,83 @@\n+List the TODOs in perceived order of ease.\n+\n+Version 3:\n+Use dma-buf handle to generate upload texture:\n+\t- eglCreateImageKHR can be used to generate the upload texture i.e.\n+\t to feed the bayer data into the GPU.\n+\n+Denoising:\n+\t- As below still TBD\n+\n+Dead pixel correction:\n+\t- As below still TBD\n+\n+Lense shading correction:\n+\t- This is WIP but as yet still TBD\n+\n+Lense flare correction:\n+\t- Not WIP still TBD\n+\n+processFrame() to run in its own thread:\n+\t- processFrame() runs in the context of the Debayer::process()\n+\t thread. Robert Mader suggested and it seems like a good\n+\t suggestion too to run processFrame() in its own thread.\n+\n+Version 2:\n+Make GPUISP default:\n+\t- Right now the environment variable allows over-riding to swtich\n+\t from CPU to GPU.\n+\t- Once we support 24 BPP output on GPUISP we will have the same\n+\t pixel format support as CPU and can set the default to GPU without\n+\t regressing functionality\n+\n+glTexture1D:\n+\t- Initial code was developed for < GLES 2.O but since we have fixed\n+\t on GLES >= 2.0 this means we can use glTexture1D\n+\t- Provided this is so amend the shaders to do val = texture(x, y, 0);\n+\t not texture(x, y, 0.5) the 0.5 is because of using glTexture2D\n+\n+Denoising:\n+\t- Run a denoise algorithm in the shaders\n+\t- Supply a control to influence the noise-floor ?\n+\n+Dead pixel correction:\n+\t- Add logic to correct dead pixels in the fragment shaders\n+\n+Version 1:\n+24 bit output support:\n+\t- Take the BPP we already capture and get a 24 bit GBM surface\n+\t- Pass a compile-time parameter to the shaders to tell them to do\n+\t gl_FragColor = rgb not gl_FragColor = rgba\n+\t- Version 2:\n+\t This is not possible.\n+\t gl_FragColor expects vec4 not vec3 on the output.\n+\t If you really want RGB888 run cpuisp.\n+\n+Surfaceless GBM:\n+\t- We get a GBM surface and then have to swap buffers\n+\t If we rework for surfaceless GBM and EGL then the swap buffer can\n+\t be dropped.\n+\t- Version 2:\n+\t Complete GBM surface removed, memcpy() phase removed also\n+\n+dma-buf texture upload:\n+\t- Currently we pass the input buffer to glCreateTexture2D.\n+\t We should be able to make the upload of the input buffer go faster\n+\t by using eglCreateImageKHR and enumerated the dma-buf contents.\n+\t- Version 2:\n+\t Complete sm8250 test platform shows 20x performance increase\n+\t with CCM.\n+\n+Render-to-texture:\n+\t- Right now we render to the GBM provided surface framebuffer\n+\t and then memcpy from that buffer to the target output buffer.\n+\t This necessitates flushing the cache on the target buffer in\n+\t addition to the memcpy().\n+\t- Render-to-texture where we generate the target framebuffer\n+\t directly from a dma-buf handle will mitigate the memcpy() phase.\n+\t- It should be the case then that the consumer of the output buffer\n+\t i.e. the thing that's not libcamera is responsible to flush the cache\n+\t if-and-only-if that user writes to the buffer.\n+\t- We need to flush the cache on the buffer because we are memcpying() to it.\n+\t- Version 2:\n+\t Done in version 2\n","prefixes":["v3","39/39"]}