1 files changed, 232 insertions, 0 deletions

diff --git a/xbmc/utils/EGLUtils.h b/xbmc/utils/EGLUtils.h
new file mode 100644
index 0000000..ad3b04d
--- /dev/null
+++ b/xbmc/utils/EGLUtils.h
@@ -0,0 +1,232 @@
+/*
+ *  Copyright (C) 2017-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include <array>
+#include <set>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include <EGL/egl.h>
+
+class CEGLUtils
+{
+public:
+  static std::set<std::string> GetClientExtensions();
+  static std::set<std::string> GetExtensions(EGLDisplay eglDisplay);
+  static bool HasExtension(EGLDisplay eglDisplay, std::string const & name);
+  static bool HasClientExtension(std::string const& name);
+  static void Log(int logLevel, std::string const& what);
+  template<typename T>
+  static T GetRequiredProcAddress(const char * procname)
+  {
+    T p = reinterpret_cast<T>(eglGetProcAddress(procname));
+    if (!p)
+    {
+      throw std::runtime_error(std::string("Could not get EGL function \"") + procname + "\" - maybe a required extension is not supported?");
+    }
+    return p;
+  }
+
+private:
+  CEGLUtils();
+};
+
+/**
+ * Convenience wrapper for heap-allocated EGL attribute arrays
+ *
+ * The wrapper makes sure that the key/value pairs are always written in actual
+ * pairs and  that the array is always terminated with EGL_NONE.
+ */
+class CEGLAttributesVec
+{
+public:
+  struct EGLAttribute
+  {
+    EGLint key;
+    EGLint value;
+  };
+
+  /**
+   * Add multiple attributes
+   *
+   * The array is automatically terminated with EGL_NONE
+   */
+  void Add(std::initializer_list<EGLAttribute> const& attributes)
+  {
+    for (auto const& attribute : attributes)
+    {
+      m_attributes.insert(m_attributes.begin(), attribute.value);
+      m_attributes.insert(m_attributes.begin(), attribute.key);
+    }
+  }
+
+  /**
+   * Add one attribute
+   *
+   * The array is automatically terminated with EGL_NONE
+   */
+  void Add(EGLAttribute const& attribute)
+  {
+    Add({attribute});
+  }
+
+  EGLint const * Get() const
+  {
+    return m_attributes.data();
+  }
+
+private:
+  std::vector<EGLint> m_attributes{EGL_NONE};
+};
+
+/**
+ * Convenience wrapper for stack-allocated EGL attribute arrays
+ *
+ * The wrapper makes sure that the key/value pairs are always written in actual
+ * pairs, that the array is always terminated with EGL_NONE, and that the bounds
+ * of the array are not exceeded (checked on runtime).
+ *
+ * \tparam AttributeCount maximum number of attributes that can be added.
+ *                        Determines the size of the storage array.
+ */
+template<std::size_t AttributeCount>
+class CEGLAttributes
+{
+public:
+  struct EGLAttribute
+  {
+    EGLint key;
+    EGLint value;
+  };
+
+  CEGLAttributes()
+  {
+    m_attributes[0] = EGL_NONE;
+  }
+
+  /**
+   * Add multiple attributes
+   *
+   * The array is automatically terminated with EGL_NONE
+   *
+   * \throws std::out_of_range if more than AttributeCount attributes are added
+   *                           in total
+   */
+  void Add(std::initializer_list<EGLAttribute> const& attributes)
+  {
+    if (m_writePosition + attributes.size() * 2 + 1 > m_attributes.size())
+    {
+      throw std::out_of_range("CEGLAttributes::Add");
+    }
+
+    for (auto const& attribute : attributes)
+    {
+      m_attributes[m_writePosition++] = attribute.key;
+      m_attributes[m_writePosition++] = attribute.value;
+    }
+    m_attributes[m_writePosition] = EGL_NONE;
+  }
+
+  /**
+   * Add one attribute
+   *
+   * The array is automatically terminated with EGL_NONE
+   *
+   * \throws std::out_of_range if more than AttributeCount attributes are added
+   *                           in total
+   */
+  void Add(EGLAttribute const& attribute)
+  {
+    Add({attribute});
+  }
+
+  EGLint const * Get() const
+  {
+    return m_attributes.data();
+  }
+
+  int Size() const
+  {
+    return m_writePosition;
+  }
+
+private:
+  std::array<EGLint, AttributeCount * 2 + 1> m_attributes;
+  int m_writePosition{};
+};
+
+class CEGLContextUtils final
+{
+public:
+  CEGLContextUtils() = default;
+  /**
+   * \param platform platform as constant from an extension building on EGL_EXT_platform_base
+   */
+  CEGLContextUtils(EGLenum platform, std::string const& platformExtension);
+  ~CEGLContextUtils();
+
+  bool CreateDisplay(EGLNativeDisplayType nativeDisplay);
+  /**
+   * Create EGLDisplay with EGL_EXT_platform_base
+   *
+   * Falls back to \ref CreateDisplay (with nativeDisplayLegacy) on failure.
+   * The native displays to use with the platform-based and the legacy approach
+   * may be defined to have different types and/or semantics, so this function takes
+   * both as separate parameters.
+   *
+   * \param nativeDisplay native display to use with eglGetPlatformDisplayEXT
+   * \param nativeDisplayLegacy native display to use with eglGetDisplay
+   */
+  bool CreatePlatformDisplay(void* nativeDisplay, EGLNativeDisplayType nativeDisplayLegacy);
+
+  void SurfaceAttrib(EGLint attribute, EGLint value);
+  bool CreateSurface(EGLNativeWindowType nativeWindow, EGLint HDRcolorSpace = EGL_NONE);
+  bool CreatePlatformSurface(void* nativeWindow, EGLNativeWindowType nativeWindowLegacy);
+  bool InitializeDisplay(EGLint renderingApi);
+  bool ChooseConfig(EGLint renderableType, EGLint visualId = 0, bool hdr = false);
+  bool CreateContext(CEGLAttributesVec contextAttribs);
+  bool BindContext();
+  void Destroy();
+  void DestroySurface();
+  void DestroyContext();
+  bool SetVSync(bool enable);
+  bool TrySwapBuffers();
+  bool IsPlatformSupported() const;
+  EGLint GetConfigAttrib(EGLint attribute) const;
+
+  EGLDisplay GetEGLDisplay() const
+  {
+    return m_eglDisplay;
+  }
+  EGLSurface GetEGLSurface() const
+  {
+    return m_eglSurface;
+  }
+  EGLContext GetEGLContext() const
+  {
+    return m_eglContext;
+  }
+  EGLConfig GetEGLConfig() const
+  {
+    return m_eglConfig;
+  }
+
+private:
+  void SurfaceAttrib();
+
+  EGLenum m_platform{EGL_NONE};
+  bool m_platformSupported{false};
+
+  EGLDisplay m_eglDisplay{EGL_NO_DISPLAY};
+  EGLSurface m_eglSurface{EGL_NO_SURFACE};
+  EGLContext m_eglContext{EGL_NO_CONTEXT};
+  EGLConfig m_eglConfig{}, m_eglHDRConfig{};
+};