{"id":25582,"url":"https://patchwork.libcamera.org/api/patches/25582/?format=json","web_url":"https://patchwork.libcamera.org/patch/25582/","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":"<20251217100138.82525-10-bryan.odonoghue@linaro.org>","date":"2025-12-17T10:01:21","name":"[v9,09/26] libcamera: shaders: Add support for Gamma","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"3b84f0f5b603856659bfecac8e4eaaab2a6d7aa8","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/25582/mbox/","series":[{"id":5669,"url":"https://patchwork.libcamera.org/api/series/5669/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5669","date":"2025-12-17T10:01:12","name":"Add GLES 2.0 GPUISP to libcamera","version":9,"mbox":"https://patchwork.libcamera.org/series/5669/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/25582/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/25582/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 81D5AC32AF\n\tfor ;\n\tWed, 17 Dec 2025 10:02:06 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 037C361D64;\n\tWed, 17 Dec 2025 11:02:06 +0100 (CET)","from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com\n\t[IPv6:2a00:1450:4864:20::32c])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 9017E61A36\n\tfor ;\n\tWed, 17 Dec 2025 11:01:53 +0100 (CET)","by mail-wm1-x32c.google.com with SMTP id\n\t5b1f17b1804b1-47a8195e515so45229425e9.0\n\tfor ;\n\tWed, 17 Dec 2025 02:01:53 -0800 (PST)","from inspiron14p-linux.ht.home (188-141-3-146.dynamic.upc.ie.\n\t[188.141.3.146]) by smtp.gmail.com with ESMTPSA id\n\t5b1f17b1804b1-47bdc1583fbsm32292585e9.0.2025.12.17.02.01.51\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tWed, 17 Dec 2025 02:01:52 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tWed, 17 Dec 2025 02:01:52 -0800 (PST)","From":"Bryan O'Donoghue ","To":"libcamera-devel@lists.libcamera.org","Cc":"pavel@ucw.cz, Bryan O'Donoghue ,\n\tMilan Zamazal ","Subject":"[PATCH v9 09/26] libcamera: shaders: Add support for Gamma","Date":"Wed, 17 Dec 2025 10:01:21 +0000","Message-ID":"<20251217100138.82525-10-bryan.odonoghue@linaro.org>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"<20251217100138.82525-1-bryan.odonoghue@linaro.org>","References":"<20251217100138.82525-1-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":"Add gamma compensation to the debayer shaders after colour correction is\napplied.\n\nSimilarly only apply the calculated Gamma curve when using the CCM as the\nlookup tables already contain the data.\n\nSuggested-by: Milan Zamazal \nReviewed-by: Milan Zamazal \nSigned-off-by: Bryan O'Donoghue \n---\n src/libcamera/shaders/bayer_1x_packed.frag | 4 ++++\n src/libcamera/shaders/bayer_unpacked.frag | 4 ++++\n 2 files changed, 8 insertions(+)","diff":"diff --git a/src/libcamera/shaders/bayer_1x_packed.frag b/src/libcamera/shaders/bayer_1x_packed.frag\nindex 7036fe278..77d9fbfa7 100644\n--- a/src/libcamera/shaders/bayer_1x_packed.frag\n+++ b/src/libcamera/shaders/bayer_1x_packed.frag\n@@ -67,6 +67,7 @@ uniform vec2 tex_bayer_first_red;\n uniform sampler2D tex_y;\n uniform mat3 ccm;\n uniform vec3 blacklevel;\n+uniform float gamma;\n \n void main(void)\n {\n@@ -260,6 +261,9 @@ void main(void)\n \trgb.g = (rin * ccm[1][0]) + (gin * ccm[1][1]) + (bin * ccm[1][2]);\n \trgb.b = (rin * ccm[2][0]) + (gin * ccm[2][1]) + (bin * ccm[2][2]);\n \n+\t/* Apply gamma after colour correction */\n+\trgb = pow(rgb, vec3(gamma));\n+\n #if defined (SWAP_BLUE)\n \tgl_FragColor = vec4(rgb.bgr, 1.0);\n #else\ndiff --git a/src/libcamera/shaders/bayer_unpacked.frag b/src/libcamera/shaders/bayer_unpacked.frag\nindex f0d8cd1e2..aba11a87f 100644\n--- a/src/libcamera/shaders/bayer_unpacked.frag\n+++ b/src/libcamera/shaders/bayer_unpacked.frag\n@@ -26,6 +26,7 @@ varying vec4 yCoord;\n varying vec4 xCoord;\n uniform mat3 ccm;\n uniform vec3 blacklevel;\n+uniform float gamma;\n \n void main(void) {\n vec3 rgb;\n@@ -155,6 +156,9 @@ void main(void) {\n rgb.g = (rin * ccm[1][0]) + (gin * ccm[1][1]) + (bin * ccm[1][2]);\n rgb.b = (rin * ccm[2][0]) + (gin * ccm[2][1]) + (bin * ccm[2][2]);\n \n+ /* Apply gamma after colour correction */\n+ rgb = pow(rgb, vec3(gamma));\n+\n #if defined (SWAP_BLUE)\n gl_FragColor = vec4(rgb.bgr, 1.0);\n #else\n","prefixes":["v9","09/26"]}