From 55245fe1c9925045198f2f0954eff8f2e5d42d7b Mon Sep 17 00:00:00 2001
From: Emil Velikov <emil.velikov@collabora.com>
Date: Thu, 9 Nov 2017 17:55:19 +0000
Subject: [PATCH] egl: Provide meaningfull error when built w/o requested
 platform

The current "No EGL platform enabled." is misleading and wrong.
We reach said code when $platform is missing.

To make this more obvious and clear provide wrappers in the header
file, making the code a bit easier to follow.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
---
 src/egl/drivers/dri2/egl_dri2.c | 12 +---------
 src/egl/drivers/dri2/egl_dri2.h | 40 +++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 11 deletions(-)

diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 8861742c17f..af821425355 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -915,33 +915,23 @@ dri2_initialize(_EGLDriver *drv, _EGLDisplay *disp)
       return EGL_FALSE;
 
    switch (disp->Platform) {
-#ifdef HAVE_SURFACELESS_PLATFORM
    case _EGL_PLATFORM_SURFACELESS:
       ret = dri2_initialize_surfaceless(drv, disp);
       break;
-#endif
-#ifdef HAVE_X11_PLATFORM
    case _EGL_PLATFORM_X11:
       ret = dri2_initialize_x11(drv, disp);
       break;
-#endif
-#ifdef HAVE_DRM_PLATFORM
    case _EGL_PLATFORM_DRM:
       ret = dri2_initialize_drm(drv, disp);
       break;
-#endif
-#ifdef HAVE_WAYLAND_PLATFORM
    case _EGL_PLATFORM_WAYLAND:
       ret = dri2_initialize_wayland(drv, disp);
       break;
-#endif
-#ifdef HAVE_ANDROID_PLATFORM
    case _EGL_PLATFORM_ANDROID:
       ret = dri2_initialize_android(drv, disp);
       break;
-#endif
    default:
-      _eglLog(_EGL_WARNING, "No EGL platform enabled.");
+      unreachable("Callers ensure we cannot get here.");
       return EGL_FALSE;
    }
 
diff --git a/src/egl/drivers/dri2/egl_dri2.h b/src/egl/drivers/dri2/egl_dri2.h
index 0ec8f44dce2..9cccf05253a 100644
--- a/src/egl/drivers/dri2/egl_dri2.h
+++ b/src/egl/drivers/dri2/egl_dri2.h
@@ -400,20 +400,60 @@ _EGLImage *
 dri2_create_image_dma_buf(_EGLDisplay *disp, _EGLContext *ctx,
                           EGLClientBuffer buffer, const EGLint *attr_list);
 
+#ifdef HAVE_X11_PLATFORM
 EGLBoolean
 dri2_initialize_x11(_EGLDriver *drv, _EGLDisplay *disp);
+#else
+static inline EGLBoolean
+dri2_initialize_x11(_EGLDriver *drv, _EGLDisplay *disp)
+{
+   return _eglError(EGL_NOT_INITIALIZED, "X11 platform not built");
+}
+#endif
 
+#ifdef HAVE_DRM_PLATFORM
 EGLBoolean
 dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp);
+#else
+static inline EGLBoolean
+dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
+{
+   return _eglError(EGL_NOT_INITIALIZED, "GBM/DRM platform not built");
+}
+#endif
 
+#ifdef HAVE_WAYLAND_PLATFORM
 EGLBoolean
 dri2_initialize_wayland(_EGLDriver *drv, _EGLDisplay *disp);
+#else
+static inline EGLBoolean
+dri2_initialize_wayland(_EGLDriver *drv, _EGLDisplay *disp)
+{
+   return _eglError(EGL_NOT_INITIALIZED, "Wayland platform not built");
+}
+#endif
 
+#ifdef HAVE_ANDROID_PLATFORM
 EGLBoolean
 dri2_initialize_android(_EGLDriver *drv, _EGLDisplay *disp);
+#else
+static inline EGLBoolean
+dri2_initialize_android(_EGLDriver *drv, _EGLDisplay *disp)
+{
+   return _eglError(EGL_NOT_INITIALIZED, "Android platform not built");
+}
+#endif
 
+#ifdef HAVE_SURFACELESS_PLATFORM
 EGLBoolean
 dri2_initialize_surfaceless(_EGLDriver *drv, _EGLDisplay *disp);
+#else
+static inline EGLBoolean
+dri2_initialize_surfaceless(_EGLDriver *drv, _EGLDisplay *disp)
+{
+   return _eglError(EGL_NOT_INITIALIZED, "Surfaceless platform not built");
+}
+#endif
 
 void
 dri2_flush_drawable_for_swapbuffers(_EGLDisplay *disp, _EGLSurface *draw);
-- 
2.30.2