{"id":25903,"url":"https://patchwork.libcamera.org/api/patches/25903/?format=json","web_url":"https://patchwork.libcamera.org/patch/25903/","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":"<20260121090854.27483-1-robert.mader@collabora.com>","date":"2026-01-21T09:08:52","name":"[v4,1/3] egl: Use the Mesa surfaceless platform instead of GBM","commit_ref":"0c2ed9ebf99e3328efe7e480d194d333a8dc5568","pull_url":null,"state":"accepted","archived":false,"hash":"b99ee7176546af46a92f960d6282abba1d9d1720","submitter":{"id":140,"url":"https://patchwork.libcamera.org/api/people/140/?format=json","name":"Robert Mader","email":"robert.mader@collabora.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/25903/mbox/","series":[{"id":5728,"url":"https://patchwork.libcamera.org/api/series/5728/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5728","date":"2026-01-21T09:08:52","name":"[v4,1/3] egl: Use the Mesa surfaceless platform instead of GBM","version":4,"mbox":"https://patchwork.libcamera.org/series/5728/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/25903/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/25903/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 4E25AC3220\n\tfor ;\n\tWed, 21 Jan 2026 09:09:38 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 7AF59615B2;\n\tWed, 21 Jan 2026 10:09:37 +0100 (CET)","from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com\n\t[136.143.188.112])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 6F198615B2\n\tfor ;\n\tWed, 21 Jan 2026 10:09:35 +0100 (CET)","by mx.zohomail.com with SMTPS id 1768986568344684.6026434509452;\n\tWed, 21 Jan 2026 01:09:28 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=collabora.com\n\theader.i=robert.mader@collabora.com header.b=\"N0P/CKRz\"; \n\tdkim-atps=neutral","ARC-Seal":"i=1; a=rsa-sha256; t=1768986570; cv=none; \n\td=zohomail.com; s=zohoarc; \n\tb=V68lifQhstoNhYLPGKjRPp40ol19r3iamDGq/1kQ760gw5LMCmAZO9WLJYchHBST0KMrYvVhwYLafrWmlpbGMe4Tm9tM0Yk0jWk3nN3AFak6BDnHius0wmUlG4pFtEjcH0QQ0kjjMNSNPtnOC3wgBSxLAUZuZWZZy+Ag9uOKuxE=","ARC-Message-Signature":"i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; \n\ts=zohoarc; t=1768986570;\n\th=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To;\n\tbh=ZWT5oBnml50K6Fm+ocsguHWNgGl5nobzdBEbiYg2BcU=; \n\tb=QfyzBZU4N8ohxPQ+DoJ2Srb+6Bhnc2y8j25sD3iTPAiZhV219wSCtD2zK0TBslJhsF+E1jhXw5NZcHopwjkrLUVtxbvNJnSqjFGg3rNb0FM1Q7ZH+UDtyVfsUop1VwrIEgR1YLtJZWJDCAuUpQvI99ow3t95w/ZmU1tcl85ipmU=","ARC-Authentication-Results":"i=1; mx.zohomail.com;\n\tdkim=pass header.i=collabora.com;\n\tspf=pass smtp.mailfrom=robert.mader@collabora.com;\n\tdmarc=pass header.from=","DKIM-Signature":"v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1768986570;\n\ts=zohomail; d=collabora.com; i=robert.mader@collabora.com;\n\th=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Reply-To;\n\tbh=ZWT5oBnml50K6Fm+ocsguHWNgGl5nobzdBEbiYg2BcU=;\n\tb=N0P/CKRzVsOgtAedr2bs/Z7CkiRCyMdv17P1MofVlqI2lPg2vyglZUsIWhRekkyf\n\trkO+bb1mIbBl1RUAkzyBhgruXxH3+BMJg4tswp42jJBBHM2uiIQ+HlujGyoSi3+KLa5\n\tVEbpTQg9d3C8KGOYVmdF5oBh4uKrpcfJcFZ/VS5o=","From":"Robert Mader ","To":"libcamera-devel@lists.libcamera.org","Cc":"Robert Mader , Bryan O'Donoghue\n\t, Milan Zamazal ,\n\t=?utf-8?b?QmFybmFiw6FzIFDFkWN6?= =?utf-8?q?e?=\n\t, Laurent Pinchart\n\t","Subject":"[PATCH v4 1/3] egl: Use the Mesa surfaceless platform instead of GBM","Date":"Wed, 21 Jan 2026 10:08:52 +0100","Message-ID":"<20260121090854.27483-1-robert.mader@collabora.com>","X-Mailer":"git-send-email 2.52.0","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","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":"Mesa surfaceless platform appears to be a better fit for the use-case at hand:\n1. Like GBM it is Mesa specific, so no change in supported setups is\n expected. If ever required, a fallback to the generic device platform\n could be added on top.\n2. It leaves the complexity of selecting a renderer device to the\n driver, reducing code and dependencies.\n3. It allows to use llvmpipe / software drivers without dri device,\n which can be useful on CI or debugging (with LIBGL_ALWAYS_SOFTWARE=1).\n\nSigned-off-by: Robert Mader \nReviewed-by: Bryan O'Donoghue \nTested-by: Bryan O'Donoghue # sm8250/rb5, x1e/Dell Insprion14p\nReviewed-by: Milan Zamazal \nTested-by: Milan Zamazal # TI AM69\nTested-by: Barnabás Pőcze # ThinkPad X1 Yoga Gen 7 + ov2740\nReviewed-by: Laurent Pinchart \n\n---\n\nChanges in v3:\n - Minor commit message improvement\n - Use EGL_DEFAULT_DISPLAY instead of nullptr (no change in behavior)\n - Improve comment formating\n - Add Laurents R-B\n\nChanges in v2:\n - Add tags\n---\n include/libcamera/internal/egl.h | 4 +---\n src/libcamera/egl.cpp | 14 +++++++-------\n src/libcamera/software_isp/debayer_egl.cpp | 9 +++------\n src/libcamera/software_isp/debayer_egl.h | 1 -\n 4 files changed, 11 insertions(+), 17 deletions(-)","diff":"diff --git a/include/libcamera/internal/egl.h b/include/libcamera/internal/egl.h\nindex f007f448a..630345ea7 100644\n--- a/include/libcamera/internal/egl.h\n+++ b/include/libcamera/internal/egl.h\n@@ -16,8 +16,6 @@\n #include \n #include \n \n-#include \"libcamera/internal/gbm.h\"\n-\n #define EGL_EGLEXT_PROTOTYPES\n #include \n #include \n@@ -96,7 +94,7 @@ public:\n \teGL();\n \t~eGL();\n \n-\tint initEGLContext(GBM *gbmContext);\n+\tint initEGLContext();\n \n \tint createInputDMABufTexture2D(eGLImage &eglImage, int fd);\n \tint createOutputDMABufTexture2D(eGLImage &eglImage, int fd);\ndiff --git a/src/libcamera/egl.cpp b/src/libcamera/egl.cpp\nindex da563ee09..5b9bbf410 100644\n--- a/src/libcamera/egl.cpp\n+++ b/src/libcamera/egl.cpp\n@@ -256,24 +256,22 @@ void eGL::createTexture2D(eGLImage &eglImage, GLint format, uint32_t width, uint\n \n /**\n * \\brief Initialise the EGL context\n- * \\param[in] gbmContext Pointer to initialised GBM context\n *\n- * Sets up the EGL display from the GBM device, creates an OpenGL ES 2.0\n- * context, and retrieves function pointers for required extensions\n- * including:\n+ * Sets up the EGL display, creates an OpenGL ES 2.0 context, and retrieves\n+ * function pointers for required extensions including:\n * - eglCreateImageKHR / eglDestroyImageKHR\n * - glEGLImageTargetTexture2DOES\n *\n * \\return 0 on success, or -ENODEV on failure\n */\n-int eGL::initEGLContext(GBM *gbmContext)\n+int eGL::initEGLContext()\n {\n \tEGLint configAttribs[] = {\n \t\tEGL_RED_SIZE, 8,\n \t\tEGL_GREEN_SIZE, 8,\n \t\tEGL_BLUE_SIZE, 8,\n \t\tEGL_ALPHA_SIZE, 8,\n-\t\tEGL_SURFACE_TYPE, EGL_WINDOW_BIT,\n+\t\tEGL_SURFACE_TYPE, EGL_PBUFFER_BIT,\n \t\tEGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,\n \t\tEGL_NONE\n \t};\n@@ -291,7 +289,9 @@ int eGL::initEGLContext(GBM *gbmContext)\n \t\tgoto fail;\n \t}\n \n-\tdisplay_ = eglGetDisplay(gbmContext->device());\n+\tdisplay_ = eglGetPlatformDisplay(EGL_PLATFORM_SURFACELESS_MESA,\n+\t\t\t\t\t EGL_DEFAULT_DISPLAY,\n+\t\t\t\t\t nullptr);\n \tif (display_ == EGL_NO_DISPLAY) {\n \t\tLOG(eGL, Error) << \"Unable to get EGL display\";\n \t\tgoto fail;\ndiff --git a/src/libcamera/software_isp/debayer_egl.cpp b/src/libcamera/software_isp/debayer_egl.cpp\nindex 9693d7252..37c44e8b1 100644\n--- a/src/libcamera/software_isp/debayer_egl.cpp\n+++ b/src/libcamera/software_isp/debayer_egl.cpp\n@@ -141,8 +141,8 @@ int DebayerEGL::initBayerShaders(PixelFormat inputFormat, PixelFormat outputForm\n \tegl_.pushEnv(shaderEnv, \"#extension GL_OES_EGL_image_external: enable\");\n \n \t/*\n-\t * Tell shaders how to re-order output taking account of how the\n-\t * pixels are actually stored by GBM\n+\t * Tell shaders how to re-order output taking account of how the pixels\n+\t * are actually stored by EGL.\n \t */\n \tswitch (outputFormat) {\n \tcase formats::ARGB8888:\n@@ -586,10 +586,7 @@ int DebayerEGL::start()\n {\n \tGLint maxTextureImageUnits;\n \n-\tif (gbmSurface_.createDevice())\n-\t\treturn -ENODEV;\n-\n-\tif (egl_.initEGLContext(&gbmSurface_))\n+\tif (egl_.initEGLContext())\n \t\treturn -ENODEV;\n \n \tglGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureImageUnits);\ndiff --git a/src/libcamera/software_isp/debayer_egl.h b/src/libcamera/software_isp/debayer_egl.h\nindex a5033bc63..cfbaf8e9d 100644\n--- a/src/libcamera/software_isp/debayer_egl.h\n+++ b/src/libcamera/software_isp/debayer_egl.h\n@@ -113,7 +113,6 @@ private:\n \tRectangle window_;\n \tstd::unique_ptr stats_;\n \teGL egl_;\n-\tGBM gbmSurface_;\n \tuint32_t width_;\n \tuint32_t height_;\n \tGLint glFormat_;\n","prefixes":["v4","1/3"]}