backend/wayland_egl: Add a fallback eglConfig

On agl-kvm-guest and agl-rdp, flutter-auto with its eglConfig will have
a black image as opposed to regular one. This is a work-around by
using a fallback eglConfig until flutter-auto gains some sort of
heuristic choosing between the eglConfig available and pick one that
can work.

Bug-AGL: SPEC-5260
Change-Id: I1f9f95d2bba1d218b9b1fb12ff11df3209dc2e03
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/30477
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/meta-agl-flutter/recipes-graphics/toyota/files/0001-backend-wayland_egl-Add-a-fallback-eglConfig.patch b/meta-agl-flutter/recipes-graphics/toyota/files/0001-backend-wayland_egl-Add-a-fallback-eglConfig.patch
new file mode 100644
index 000000000..f2195dddc
--- /dev/null
+++ b/meta-agl-flutter/recipes-graphics/toyota/files/0001-backend-wayland_egl-Add-a-fallback-eglConfig.patch
@@ -0,0 +1,88 @@
+From 372b9c4edd42b67827b75863b978091ba5cff5cd Mon Sep 17 00:00:00 2001
+From: Marius Vlad <marius.vlad@collabora.com>
+Date: Thu, 17 Oct 2024 17:25:41 +0300
+Subject: [PATCH 1/2] backend/wayland_egl: Add a fallback eglConfig
+
+This seems to aid flutter-auto at displaying an image on agl-rdp
+with software rendering, and on agl-kvm with virgl.  Makes uses of a fallback
+eGLConfig (< 24 bit) and tries to use that one rather than the default one (24-bit).
+
+Bug-AGL: SPEC-5260
+Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
+---
+ cmake/config_common.h.in         | 17 ++++++++++++++++-
+ shell/backend/wayland_egl/egl.cc | 23 ++++++++++++++++++++---
+ 2 files changed, 36 insertions(+), 4 deletions(-)
+
+diff --git a/cmake/config_common.h.in b/cmake/config_common.h.in
+index 07ce9b7..2c54c67 100644
+--- a/cmake/config_common.h.in
++++ b/cmake/config_common.h.in
+@@ -155,6 +155,21 @@ static constexpr std::array<EGLint, 27> kEglConfigAttribs = {{
+     // clang-format on
+ }};
+ 
++
++static constexpr std::array<EGLint, 27> kEglConfigAttribsFallBack = {{
++    // clang-format off
++    EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
++    EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
++
++    EGL_RED_SIZE, 1,
++    EGL_GREEN_SIZE, 1,
++    EGL_BLUE_SIZE, 1,
++    EGL_ALPHA_SIZE, 2,
++    EGL_NONE // termination sentinel
++    // clang-format on
++}};
++
++
+ // All vkCreate* functions take an optional allocator. For now, we select the
+ // default allocator by passing in a null pointer, and we highlight the argument
+ // by using the VKALLOC constant.
+@@ -181,4 +196,4 @@ constexpr struct VkAllocationCallbacks* VKALLOC = nullptr;
+ #cmakedefine01 ENV32BIT
+ #cmakedefine01 ENV64BIT
+ 
+-#endif //CONFIG_COMMON_H_
+\ No newline at end of file
++#endif //CONFIG_COMMON_H_
+diff --git a/shell/backend/wayland_egl/egl.cc b/shell/backend/wayland_egl/egl.cc
+index 99555d6..70164ba 100644
+--- a/shell/backend/wayland_egl/egl.cc
++++ b/shell/backend/wayland_egl/egl.cc
+@@ -62,11 +62,28 @@ Egl::Egl(void* native_display, int buffer_size, bool debug)
+       break;
+     }
+   }
+-  free(configs);
+   if (m_config == nullptr) {
+-    spdlog::critical("did not find config with buffer size {}", m_buffer_size);
+-    assert(false);
++    // try with the fallback one
++    spdlog::critical("Could not use default EGLConfig trying with fallback.");
++    ret = eglChooseConfig(m_dpy, kEglConfigAttribsFallBack.data(), configs,
++                          count, &n);
++    assert(ret && n >= 1);
++
++    for (EGLint i = 0; i < n; i++) {
++      eglGetConfigAttrib(m_dpy, configs[i], EGL_BUFFER_SIZE, &size);
++      SPDLOG_DEBUG("Buffer size for config {} is {}", i, size);
++      if (m_buffer_size <= size) {
++        memcpy(&m_config, &configs[i], sizeof(EGLConfig));
++        break;
++      }
++    }
++    if (m_config == nullptr) {
++      spdlog::critical("did not find config with buffer size {}",
++                       m_buffer_size);
++      assert(false);
++    }
+   }
++  free(configs);
+ 
+   m_context = eglCreateContext(m_dpy, m_config, EGL_NO_CONTEXT,
+                                kEglContextAttribs.data());
+-- 
+2.43.0
+