buildroot/package/sdl2/0001-Buildsystem-Add-guards-for-not-building-with-KMSDRM-support-if-EGL.patch

From 2fc987c28f14668a9ce360331f591e32e20c3906 Mon Sep 17 00:00:00 2001
From: Manuel Alfayate Corchete <redwindwanderer@gmail.com>
Date: Tue, 22 Dec 2020 14:15:33 +0100
Subject: [PATCH] [Buildsystem] Add guards for not building with KMSDRM support
 if EGL is not available.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from:
https://github.com/libsdl-org/SDL/commit/2fc987c28f14668a9ce360331f591e32e20c3906]
---
 configure.ac                                  | 29 ++++++++++++++++++-
 src/video/kmsdrm/SDL_kmsdrmopengles.c         |  4 +--
 src/video/kmsdrm/SDL_kmsdrmopengles.h         |  4 +--
 src/video/kmsdrm/SDL_kmsdrmvideo.c            | 22 +++++---------
 src/video/kmsdrm/SDL_kmsdrmvideo.h            |  8 -----
 .../SDL_kmsdrm_legacy_opengles.c              |  4 +--
 .../SDL_kmsdrm_legacy_opengles.h              |  4 +--
 .../kmsdrm_legacy/SDL_kmsdrm_legacy_video.c   | 20 ++-----------
 .../kmsdrm_legacy/SDL_kmsdrm_legacy_video.h   |  6 ++--
 9 files changed, 47 insertions(+), 54 deletions(-)

diff --git a/configure.ac b/configure.ac
index b7e519b8f..acff858ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2236,7 +2236,10 @@ CheckKMSDRM()
 AS_HELP_STRING([--enable-video-kmsdrm], [use KMSDRM video driver [[default=no]]]),
                   , enable_video_kmsdrm=no)
 
-    if test x$enable_video = xyes -a x$enable_video_kmsdrm = xyes; then
+    if  test x$enable_video = xyes && \
+        test x$enable_video_kmsdrm = xyes && \
+        test x$video_opengl_egl = xyes; then
+
         video_kmsdrm=no
 
         PKG_CHECK_MODULES([LIBDRM], [libdrm >= 1.4.82], libdrm_avail=yes, libdrm_avail=no)
@@ -2418,6 +2421,28 @@ CheckOpenGLESX11()
     fi
 }
 
+dnl Find EGL
+CheckEGLKMSDRM()
+{
+    AC_MSG_CHECKING(for EGL support)
+    video_opengl_egl=no
+    AC_TRY_COMPILE([
+      #define LINUX
+      #define EGL_API_FB
+      #define MESA_EGL_NO_X11_HEADERS
+      #define EGL_NO_X11
+      #include <EGL/egl.h>
+      #include <EGL/eglext.h>
+    ],[
+    ],[
+    video_opengl_egl=yes
+    ])
+    AC_MSG_RESULT($video_opengl_egl)
+    if test x$video_opengl_egl = xyes; then
+	AC_DEFINE(SDL_VIDEO_OPENGL_EGL, 1, [ ])
+    fi
+}
+
 dnl Check for Windows OpenGL
 CheckWINDOWSGL()
 {
@@ -3555,6 +3580,8 @@ case "$host" in
         CheckRPI
         CheckX11
         CheckDirectFB
+        # Need to check for EGL first because KMSDRM depends on it.
+        CheckEGLKMSDRM
         CheckKMSDRM
         CheckOpenGLX11
         CheckOpenGLESX11
diff --git a/src/video/kmsdrm/SDL_kmsdrmopengles.c b/src/video/kmsdrm/SDL_kmsdrmopengles.c
index c9ec554b4..664621d2b 100644
--- a/src/video/kmsdrm/SDL_kmsdrmopengles.c
+++ b/src/video/kmsdrm/SDL_kmsdrmopengles.c
@@ -22,7 +22,7 @@
 
 #include "../../SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL
+#if SDL_VIDEO_DRIVER_KMSDRM
 
 #include "SDL_kmsdrmvideo.h"
 #include "SDL_kmsdrmopengles.h"
@@ -376,6 +376,6 @@ KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window)
 
 SDL_EGL_MakeCurrent_impl(KMSDRM)
 
-#endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */
+#endif /* SDL_VIDEO_DRIVER_KMSDRM */
 
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/video/kmsdrm/SDL_kmsdrmopengles.h b/src/video/kmsdrm/SDL_kmsdrmopengles.h
index f81b0c3dc..c8db7da86 100644
--- a/src/video/kmsdrm/SDL_kmsdrmopengles.h
+++ b/src/video/kmsdrm/SDL_kmsdrmopengles.h
@@ -24,7 +24,7 @@
 #ifndef SDL_kmsdrmopengles_h_
 #define SDL_kmsdrmopengles_h_
 
-#if SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL
+#if SDL_VIDEO_DRIVER_KMSDRM
 
 #include "../SDL_sysvideo.h"
 #include "../SDL_egl_c.h"
@@ -42,7 +42,7 @@ extern SDL_GLContext KMSDRM_GLES_CreateContext(_THIS, SDL_Window * window);
 extern int KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window);
 extern int KMSDRM_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context);
 
-#endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */
+#endif /* SDL_VIDEO_DRIVER_KMSDRM */
 
 #endif /* SDL_kmsdrmopengles_h_ */
 
diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.c b/src/video/kmsdrm/SDL_kmsdrmvideo.c
index e84bd5ebc..663bc2170 100644
--- a/src/video/kmsdrm/SDL_kmsdrmvideo.c
+++ b/src/video/kmsdrm/SDL_kmsdrmvideo.c
@@ -846,7 +846,6 @@ KMSDRM_CreateDevice(int devindex)
     device->SetWindowGrab = KMSDRM_SetWindowGrab;
     device->DestroyWindow = KMSDRM_DestroyWindow;
     device->GetWindowWMInfo = KMSDRM_GetWindowWMInfo;
-#if SDL_VIDEO_OPENGL_EGL
     device->GL_DefaultProfileConfig = KMSDRM_GLES_DefaultProfileConfig;
     device->GL_LoadLibrary = KMSDRM_GLES_LoadLibrary;
     device->GL_GetProcAddress = KMSDRM_GLES_GetProcAddress;
@@ -857,9 +856,7 @@ KMSDRM_CreateDevice(int devindex)
     device->GL_GetSwapInterval = KMSDRM_GLES_GetSwapInterval;
     device->GL_SwapWindow = KMSDRM_GLES_SwapWindow;
     device->GL_DeleteContext = KMSDRM_GLES_DeleteContext;
-#endif
-    device->PumpEvents = KMSDRM_PumpEvents;
-    device->free = KMSDRM_DeleteDevice;
+
 #if SDL_VIDEO_VULKAN
     device->Vulkan_LoadLibrary = KMSDRM_Vulkan_LoadLibrary;
     device->Vulkan_UnloadLibrary = KMSDRM_Vulkan_UnloadLibrary;
@@ -867,6 +864,10 @@ KMSDRM_CreateDevice(int devindex)
     device->Vulkan_CreateSurface = KMSDRM_Vulkan_CreateSurface;
     device->Vulkan_GetDrawableSize = KMSDRM_Vulkan_GetDrawableSize;
 #endif
+
+    device->PumpEvents = KMSDRM_PumpEvents;
+    device->free = KMSDRM_DeleteDevice;
+
     return device;
 
 cleanup:
@@ -1327,9 +1328,7 @@ KMSDRM_DestroySurfaces(_THIS, SDL_Window *window)
     SDL_DisplayData *dispdata = (SDL_DisplayData *)SDL_GetDisplayDriverData(0);
     KMSDRM_PlaneInfo plane_info = {0};
 
-#if SDL_VIDEO_OPENGL_EGL
     EGLContext egl_context;
-#endif
 
     /********************************************************************/
     /* BLOCK 1: protect the PRIMARY PLANE before destroying the buffers */
@@ -1380,7 +1379,6 @@ KMSDRM_DestroySurfaces(_THIS, SDL_Window *window)
     /* will get wrong info and we will be in trouble.                          */
     /***************************************************************************/
 
-#if SDL_VIDEO_OPENGL_EGL
     egl_context = (EGLContext)SDL_GL_GetCurrentContext();
     SDL_EGL_MakeCurrent(_this, EGL_NO_SURFACE, egl_context);
 
@@ -1388,7 +1386,6 @@ KMSDRM_DestroySurfaces(_THIS, SDL_Window *window)
         SDL_EGL_DestroySurface(_this, windata->egl_surface);
         windata->egl_surface = EGL_NO_SURFACE;
     }
-#endif
 
     if (windata->gs) {
         KMSDRM_gbm_surface_destroy(windata->gs);
@@ -1431,7 +1428,6 @@ KMSDRM_CreateSurfaces(_THIS, SDL_Window * window)
         return SDL_SetError("Could not create GBM surface");
     }
 
-#if SDL_VIDEO_OPENGL_EGL
     /* We can't get the EGL context yet because SDL_CreateRenderer has not been called,
        but we need an EGL surface NOW, or GL won't be able to render into any surface
        and we won't see the first frame. */
@@ -1448,8 +1444,6 @@ KMSDRM_CreateSurfaces(_THIS, SDL_Window * window)
     egl_context = (EGLContext)SDL_GL_GetCurrentContext();
     ret = SDL_EGL_MakeCurrent(_this, windata->egl_surface, egl_context);
 
-#endif
-
 cleanup:
 
     if (ret) {
@@ -1478,11 +1472,11 @@ KMSDRM_DestroyWindow(_THIS, SDL_Window *window)
 
     if (!is_vulkan) {
         KMSDRM_DestroySurfaces(_this, window);
-#if SDL_VIDEO_OPENGL_EGL
+
         if (_this->egl_data) {
             SDL_EGL_UnloadLibrary(_this);
         }
-#endif
+
         if (dispdata->gbm_init) {
             KMSDRM_DeinitMouse(_this);
             KMSDRM_GBMDeinit(_this, dispdata);
@@ -1754,7 +1748,6 @@ KMSDRM_CreateWindow(_THIS, SDL_Window * window)
                  goto cleanup;
          }
 
-#if SDL_VIDEO_OPENGL_EGL
          /* Manually load the EGL library. KMSDRM_EGL_LoadLibrary() has already
             been called by SDL_CreateWindow() but we don't do anything there,
             precisely to be able to load it here.
@@ -1766,7 +1759,6 @@ KMSDRM_CreateWindow(_THIS, SDL_Window * window)
                  goto cleanup;
              }
          }
-#endif
 
          /* Can't init mouse stuff sooner because cursor plane is not ready. */
          KMSDRM_InitMouse(_this);
diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.h b/src/video/kmsdrm/SDL_kmsdrmvideo.h
index 2cf34522b..e58c922a8 100644
--- a/src/video/kmsdrm/SDL_kmsdrmvideo.h
+++ b/src/video/kmsdrm/SDL_kmsdrmvideo.h
@@ -34,10 +34,8 @@
 
 #include <gbm.h>
 #include <assert.h>
-#if SDL_VIDEO_OPENGL_EGL
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
-#endif
 
 /****************************************************************************************/
 /* Driverdata pointers are void struct* used to store backend-specific variables        */
@@ -101,10 +99,6 @@ typedef struct SDL_DisplayData
     EGLSyncKHR kms_fence;
     EGLSyncKHR gpu_fence;
 
-#if SDL_VIDEO_OPENGL_EGL
-    EGLSurface old_egl_surface;
-#endif
-
     SDL_bool modeset_pending;
     SDL_bool gbm_init;
 
@@ -129,9 +123,7 @@ typedef struct SDL_WindowData
     struct gbm_bo *bo;
     struct gbm_bo *next_bo;
 
-#if SDL_VIDEO_OPENGL_EGL
     EGLSurface egl_surface;
-#endif
 
     /* For scaling and AR correction. */
     int32_t src_w;
diff --git a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.c b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.c
index 890801891..a886eb326 100644
--- a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.c
+++ b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.c
@@ -21,7 +21,7 @@
 
 #include "../../SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL
+#if SDL_VIDEO_DRIVER_KMSDRM
 
 #include "SDL_log.h"
 
@@ -147,6 +147,6 @@ KMSDRM_LEGACY_GLES_SwapWindow(_THIS, SDL_Window * window) {
 
 SDL_EGL_MakeCurrent_impl(KMSDRM_LEGACY)
 
-#endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */
+#endif /* SDL_VIDEO_DRIVER_KMSDRM */
 
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.h b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.h
index 5e5ba96dc..2926cbe58 100644
--- a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.h
+++ b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_opengles.h
@@ -23,7 +23,7 @@
 #ifndef SDL_kmsdrmopengles_h_
 #define SDL_kmsdrmopengles_h_
 
-#if SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL
+#if SDL_VIDEO_DRIVER_KMSDRM
 
 #include "../SDL_sysvideo.h"
 #include "../SDL_egl_c.h"
@@ -41,7 +41,7 @@ extern SDL_GLContext KMSDRM_LEGACY_GLES_CreateContext(_THIS, SDL_Window * window
 extern int KMSDRM_LEGACY_GLES_SwapWindow(_THIS, SDL_Window * window);
 extern int KMSDRM_LEGACY_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context);
 
-#endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */
+#endif /* SDL_VIDEO_DRIVER_KMSDRM */
 
 #endif /* SDL_kmsdrmopengles_h_ */
 
diff --git a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.c b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.c
index 36b1899bd..acddfc29a 100644
--- a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.c
+++ b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.c
@@ -213,7 +213,7 @@ KMSDRM_LEGACY_CreateDevice(int devindex)
     device->SetWindowGrab = KMSDRM_LEGACY_SetWindowGrab;
     device->DestroyWindow = KMSDRM_LEGACY_DestroyWindow;
     device->GetWindowWMInfo = KMSDRM_LEGACY_GetWindowWMInfo;
-#if SDL_VIDEO_OPENGL_EGL
+
     device->GL_LoadLibrary = KMSDRM_LEGACY_GLES_LoadLibrary;
     device->GL_GetProcAddress = KMSDRM_LEGACY_GLES_GetProcAddress;
     device->GL_UnloadLibrary = KMSDRM_LEGACY_GLES_UnloadLibrary;
@@ -223,7 +223,7 @@ KMSDRM_LEGACY_CreateDevice(int devindex)
     device->GL_GetSwapInterval = KMSDRM_LEGACY_GLES_GetSwapInterval;
     device->GL_SwapWindow = KMSDRM_LEGACY_GLES_SwapWindow;
     device->GL_DeleteContext = KMSDRM_LEGACY_GLES_DeleteContext;
-#endif
+
     device->PumpEvents = KMSDRM_LEGACY_PumpEvents;
     device->free = KMSDRM_LEGACY_DeleteDevice;
 
@@ -369,14 +369,12 @@ KMSDRM_LEGACY_DestroySurfaces(_THIS, SDL_Window * window)
         windata->next_bo = NULL;
     }
 
-#if SDL_VIDEO_OPENGL_EGL
     SDL_EGL_MakeCurrent(_this, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 
     if (windata->egl_surface != EGL_NO_SURFACE) {
         SDL_EGL_DestroySurface(_this, windata->egl_surface);
         windata->egl_surface = EGL_NO_SURFACE;
     }
-#endif
 
     if (windata->gs) {
         KMSDRM_LEGACY_gbm_surface_destroy(windata->gs);
@@ -394,18 +392,14 @@ KMSDRM_LEGACY_CreateSurfaces(_THIS, SDL_Window * window)
     Uint32 height = dispdata->mode.vdisplay;
     Uint32 surface_fmt = GBM_FORMAT_XRGB8888;
     Uint32 surface_flags = GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING;
-#if SDL_VIDEO_OPENGL_EGL
     EGLContext egl_context;
-#endif
 
     if (!KMSDRM_LEGACY_gbm_device_is_format_supported(viddata->gbm, surface_fmt, surface_flags)) {
         SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "GBM surface format not supported. Trying anyway.");
     }
 
-#if SDL_VIDEO_OPENGL_EGL
     SDL_EGL_SetRequiredVisualId(_this, surface_fmt);
     egl_context = (EGLContext)SDL_GL_GetCurrentContext();
-#endif
 
     KMSDRM_LEGACY_DestroySurfaces(_this, window);
 
@@ -415,7 +409,6 @@ KMSDRM_LEGACY_CreateSurfaces(_THIS, SDL_Window * window)
         return SDL_SetError("Could not create GBM surface");
     }
 
-#if SDL_VIDEO_OPENGL_EGL
     windata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windata->gs);
 
     if (windata->egl_surface == EGL_NO_SURFACE) {
@@ -425,7 +418,6 @@ KMSDRM_LEGACY_CreateSurfaces(_THIS, SDL_Window * window)
     SDL_EGL_MakeCurrent(_this, windata->egl_surface, egl_context);
 
     windata->egl_surface_dirty = 0;
-#endif
 
     return 0;
 }
@@ -734,15 +726,9 @@ KMSDRM_LEGACY_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode
         SDL_Window *window = viddata->windows[i];
         SDL_WindowData *windata = (SDL_WindowData *)window->driverdata;
 
-#if SDL_VIDEO_OPENGL_EGL
         /* Can't recreate EGL surfaces right now, need to wait until SwapWindow
            so the correct thread-local surface and context state are available */
         windata->egl_surface_dirty = 1;
-#else
-        if (KMSDRM_LEGACY_CreateSurfaces(_this, window)) {
-            return -1;
-        }
-#endif
 
         /* Tell app about the resize */
         SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, mode->w, mode->h);
@@ -758,13 +744,11 @@ KMSDRM_LEGACY_CreateWindow(_THIS, SDL_Window * window)
     SDL_WindowData *windata;
     SDL_VideoDisplay *display;
 
-#if SDL_VIDEO_OPENGL_EGL
     if (!_this->egl_data) {
         if (SDL_GL_LoadLibrary(NULL) < 0) {
             goto error;
         }
     }
-#endif
 
     /* Allocate window internal data */
     windata = (SDL_WindowData *)SDL_calloc(1, sizeof(SDL_WindowData));
diff --git a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.h b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.h
index 28e1bc4fe..9df2bcfa3 100644
--- a/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.h
+++ b/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_video.h
@@ -31,9 +31,7 @@
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 #include <gbm.h>
-#if SDL_VIDEO_OPENGL_EGL
 #include <EGL/egl.h>
-#endif
 
 typedef struct SDL_VideoData
 {
@@ -71,10 +69,10 @@ typedef struct SDL_WindowData
     struct gbm_bo *crtc_bo;
     SDL_bool waiting_for_flip;
     SDL_bool double_buffer;
-#if SDL_VIDEO_OPENGL_EGL
+
     int egl_surface_dirty;
     EGLSurface egl_surface;
-#endif
+
 } SDL_WindowData;
 
 typedef struct KMSDRM_LEGACY_FBInfo