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- // Copyright 2020 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef UI_GL_GL_DISPLAY_EGL_UTIL_H_
- #define UI_GL_GL_DISPLAY_EGL_UTIL_H_
- #include <vector>
- #include "base/scoped_environment_variable_override.h"
- #include "third_party/abseil-cpp/absl/types/optional.h"
- #include "third_party/khronos/EGL/egl.h"
- #include "ui/gl/gl_export.h"
- #include "ui/gl/gl_surface_egl.h"
- namespace gl {
- // Utility singleton class that helps to set additional egl properties. This
- // class should be implemented by each platform except Ozone. In case of Ozone,
- // there is a common implementation that forwards calls to a public interface of
- // a platform.
- // The reason why it is defined here in ui/gl is that ui/gl cannot depend on
- // ozone and we have to provide an interface here. ui/gl/init will provide an
- // implementation for this utility class upon initialization of gl.
- class GL_EXPORT GLDisplayEglUtil {
- public:
- // Returns either set instance or stub instance.
- static GLDisplayEglUtil* GetInstance();
- static void SetInstance(GLDisplayEglUtil* gl_display_util);
- // Returns display attributes for the given |platform_type|. Each platform can
- // have different attributes.
- virtual void GetPlatformExtraDisplayAttribs(
- EGLenum platform_type,
- std::vector<EGLAttrib>* attributes) = 0;
- // Sets custom alpha and buffer size for a given platform. By default, the
- // values are not modified.
- virtual void ChoosePlatformCustomAlphaAndBufferSize(EGLint* alpha_size,
- EGLint* buffer_size) = 0;
- // X11 specific; returns scoped unset display env variable if vulkan surface
- // is not supported.
- virtual absl::optional<base::ScopedEnvironmentVariableOverride>
- MaybeGetScopedDisplayUnsetForVulkan() = 0;
- protected:
- virtual ~GLDisplayEglUtil() = default;
- };
- } // namespace gl
- #endif // UI_GL_GL_DISPLAY_EGL_UTIL_H_
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