Only require minimum gbm version when needed.

We only need a recent version of gbm when enable_gbm_allocation gets
set.

Close #134

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Lepton Wu <lepton@chromium.org>

configure.ac

@@ -137,7 +137,12 @@ AM_CONDITIONAL(HAVE_VALGRIND, [test "x$VALGRIND" != "x"])
 AM_CONDITIONAL(BUILD_TESTS, [test "x$build_tests" = "xyes"])
 
 LIBDRM_REQUIRED=2.4.50
-LIBGBM_REQUIRED=18.0.0
+
+if test "x$enable_gbm_allocation" = xyes; then
+	LIBGBM_REQUIRED=18.0.0
+else
+	LIBGBM_REQUIRED=0.0.0
+fi
 
 if test "x$os_win32" = xno && test "x$enable_egl" != "xno"; then
 	PKG_CHECK_MODULES([LIBDRM], [libdrm >= $LIBDRM_REQUIRED])

meson.build

@@ -96,9 +96,17 @@ with_glx = require_glx or auto_egl_glx
 have_egl = false
 have_glx = false
 
+with_gbm_allocation = get_option('gbm_allocation')
+if with_gbm_allocation
+   conf_data.set('ENABLE_GBM_ALLOCATION', 1)
+   _gbm_ver = '18.0.0'
+else
+   _gbm_ver = '0.0.0'
+endif
+
 if with_egl
    if cc.has_header('epoxy/egl.h') and epoxy_dep.get_pkgconfig_variable('epoxy_has_egl') == '1'
-      gbm_dep = dependency('gbm', version: '>= 18.0.0', required: require_egl)
+      gbm_dep = dependency('gbm', version: '>= ' + _gbm_ver, required: require_egl)
       have_egl = gbm_dep.found()
       conf_data.set('HAVE_EPOXY_EGL_H', 1)
    else
@@ -122,11 +130,6 @@ if cc.compiles('void __attribute__((hidden)) func() {}')
    conf_data.set('HAVE_FUNC_ATTRIBUTE_VISIBILITY', 1)
 endif
 
-with_gbm_allocation = get_option('gbm_allocation')
-if with_gbm_allocation
-   conf_data.set('ENABLE_GBM_ALLOCATION', 1)
-endif
-
 configure_file(input : 'config.h.meson',
                output : 'config.h',
                configuration : conf_data)

src/virgl_egl_context.c

@@ -397,6 +397,7 @@ bool virgl_has_egl_khr_gl_colorspace(struct virgl_egl *egl)
    return has_bit(egl->extension_bits, EGL_KHR_GL_COLORSPACE);
 }
 
+#ifdef ENABLE_GBM_ALLOCATION
 void *virgl_egl_image_from_dmabuf(struct virgl_egl *egl, struct gbm_bo *bo)
 {
    int ret;
@@ -510,6 +511,7 @@ void virgl_egl_image_destroy(struct virgl_egl *egl, void *image)
 {
    eglDestroyImageKHR(egl->egl_display, image);
 }
+#endif
 
 bool virgl_egl_need_fence_and_wait_external(struct virgl_egl *egl)
 {

src/virgl_gbm.c

@@ -306,6 +306,7 @@ int virgl_gbm_convert_format(uint32_t *virgl_format, uint32_t *gbm_format)
     return -1;
 }
 
+#ifdef ENABLE_GBM_ALLOCATION
 int virgl_gbm_transfer(struct gbm_bo *bo, uint32_t direction, struct iovec *iovecs,
                        uint32_t num_iovecs, const struct vrend_transfer_info *info)
 {
@@ -391,17 +392,6 @@ uint32_t virgl_gbm_convert_flags(uint32_t virgl_bind_flags)
    return flags;
 }
 
-int virgl_gbm_export_fd(struct gbm_device *gbm, uint32_t handle, int32_t *out_fd)
-{
-   int ret;
-   ret = drmPrimeHandleToFD(gbm_device_get_fd(gbm), handle, DRM_CLOEXEC | DRM_RDWR, out_fd);
-   // Kernels with older DRM core versions block DRM_RDWR but give a
-   // read/write mapping anyway.
-   if (ret)
-      ret = drmPrimeHandleToFD(gbm_device_get_fd(gbm), handle, DRM_CLOEXEC, out_fd);
-
-   return ret;
-}
 
 int virgl_gbm_export_query(struct gbm_bo *bo, struct virgl_renderer_export_query *query)
 {
@@ -461,6 +451,19 @@ err_close:
    query->out_num_fds = 0;
    return ret;
 }
+#endif
+
+int virgl_gbm_export_fd(struct gbm_device *gbm, uint32_t handle, int32_t *out_fd)
+{
+   int ret;
+   ret = drmPrimeHandleToFD(gbm_device_get_fd(gbm), handle, DRM_CLOEXEC | DRM_RDWR, out_fd);
+   // Kernels with older DRM core versions block DRM_RDWR but give a
+   // read/write mapping anyway.
+   if (ret)
+      ret = drmPrimeHandleToFD(gbm_device_get_fd(gbm), handle, DRM_CLOEXEC, out_fd);
+
+   return ret;
+}
 
 int virgl_gbm_get_plane_width(struct gbm_bo *bo, int plane) {
    uint32_t format = gbm_bo_get_format(bo);