egl: Check context attributes in egl_choose_config()

This is in preparation for creating EGL contexts of any flavor.

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

4 files changed, 53 insertions, 2 deletions

diff --git a/src/waffle/egl/egl_no_native.c b/src/waffle/egl/egl_no_native.c
index 2efb684..583d218 100644
--- a/src/waffle/egl/egl_no_native.c
+++ b/src/waffle/egl/egl_no_native.c
@@ -72,14 +72,62 @@ egl_terminate(EGLDisplay dpy)
     return ok;
 }
 
+/// @brief Check the `wcore_config_attrs.context_` attributes.
+static bool
+egl_config_check_context_attrs(
+        struct linux_platform *platform,
+        const struct wcore_config_attrs *attrs)
+{
+    int version = 10 * attrs->context_major_version
+                + attrs->context_minor_version;
+
+    switch (attrs->context_api) {
+        case WAFFLE_CONTEXT_OPENGL:
+            if (version != 10) {
+                wcore_errorf(WAFFLE_UNSUPPORTED_ON_PLATFORM,
+                             "on EGL, the requested version of OpenGL must be "
+                             "the default value 1.0");
+                return false;
+            }
+            if (!linux_platform_dl_can_open(platform, WAFFLE_DL_OPENGL)) {
+                wcore_errorf(WAFFLE_UNSUPPORTED_ON_PLATFORM,
+                             "failed to open the OpenGL library");
+                return false;
+            }
+            return true;
+        case WAFFLE_CONTEXT_OPENGL_ES1:
+            if (!linux_platform_dl_can_open(platform, WAFFLE_DL_OPENGL_ES1)) {
+                wcore_errorf(WAFFLE_UNSUPPORTED_ON_PLATFORM,
+                             "failed to open the OpenGL ES1 library");
+                return false;
+            }
+            return true;
+        case WAFFLE_CONTEXT_OPENGL_ES2:
+            if (!linux_platform_dl_can_open(platform, WAFFLE_DL_OPENGL_ES2)) {
+                wcore_errorf(WAFFLE_UNSUPPORTED_ON_PLATFORM,
+                             "failed to open the OpenGL ES2 library");
+                return false;
+            }
+            return true;
+        default:
+            wcore_error_internal("context_api has bad value %#x",
+                                 attrs->context_api);
+            return false;
+    }
+}
+
 EGLConfig
 egl_choose_config(
+        struct linux_platform *platform,
         EGLDisplay dpy,
         const struct wcore_config_attrs *attrs,
         int32_t waffle_gl_api)
 {
     bool ok = true;
 
+    if (!egl_config_check_context_attrs(platform, attrs))
+        return false;
+
     // WARNING: If you resize attrib_list, then update renderable_index.
     const int renderable_index = 19;
 
diff --git a/src/waffle/egl/egl_no_native.h b/src/waffle/egl/egl_no_native.h
index ddb7510..5f79daa 100644
--- a/src/waffle/egl/egl_no_native.h
+++ b/src/waffle/egl/egl_no_native.h
@@ -41,6 +41,7 @@ egl_terminate(EGLDisplay dpy);
 
 EGLConfig
 egl_choose_config(
+        struct linux_platform *platform,
         EGLDisplay dpy,
         const struct wcore_config_attrs *attrs,
         int32_t waffle_gl_api);
diff --git a/src/waffle/wayland/wayland_config.c b/src/waffle/wayland/wayland_config.c
index a706f6b..d6deef2 100644
--- a/src/waffle/wayland/wayland_config.c
+++ b/src/waffle/wayland/wayland_config.c
@@ -51,7 +51,8 @@ wayland_config_choose(
     if (!ok)
         goto error;
 
-    self->wl->egl_config = egl_choose_config(dpy->wl->egl_display,
+    self->wl->egl_config = egl_choose_config(platform->wl->linux_,
+                                             dpy->wl->egl_display,
                                              attrs,
                                              platform->wl->gl_api);
     if (!self->wl->egl_config)
diff --git a/src/waffle/x11_egl/xegl_config.c b/src/waffle/x11_egl/xegl_config.c
index 83d7d89..14bac8b 100644
--- a/src/waffle/x11_egl/xegl_config.c
+++ b/src/waffle/x11_egl/xegl_config.c
@@ -50,7 +50,8 @@ xegl_config_choose(
     ok &= egl_get_render_buffer_attrib(attrs, &self->xegl->egl_render_buffer);
     if (!ok)
         goto error;
-    self->xegl->egl_config = egl_choose_config(dpy->xegl->egl_display,
+    self->xegl->egl_config = egl_choose_config(platform->xegl->linux_,
+                                               dpy->xegl->egl_display,
                                                attrs,
                                                platform->xegl->gl_api);
     if (!self->xegl->egl_config)