ui/gl/gl_version_info.h

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GL_GL_VERSION_INFO_H_
#define UI_GL_GL_VERSION_INFO_H_

#include <set>
#include <string>
#include "build/build_config.h"
#include "ui/gfx/extension_set.h"
#include "ui/gl/gl_export.h"

namespace gl {

struct GL_EXPORT GLVersionInfo {
  GLVersionInfo(const char* version_str,
                const char* renderer_str,
                const gfx::ExtensionSet& exts);

  GLVersionInfo(const GLVersionInfo&) = delete;
  GLVersionInfo& operator=(const GLVersionInfo&) = delete;

  bool IsAtLeastGLES(unsigned major, unsigned minor) const {
    return (major_version > major ||
            (major_version == major && minor_version >= minor));
  }

  struct VersionStrings {
    const char* gl_version;
    const char* glsl_version;
  };

  // Returns version strings for GL and GLSL (similar to glGetString(GL_VERSION)
  // and glGetString(GL_SHADING_LANGUAGE_VERSION) matching major/minor versions
  VersionStrings GetFakeVersionStrings(unsigned major, unsigned minor) const;

  // We need to emulate GL_ALPHA and GL_LUMINANCE and GL_LUMINANCE_ALPHA
  // texture formats on core profile and ES3, except for ANGLE and Swiftshader.
  bool NeedsLuminanceAlphaEmulation() const {
    return !is_angle && !is_swiftshader && is_es3;
  }

  bool is_angle = false;
  bool is_d3d = false;
  bool is_mesa = false;
  bool is_swiftshader = false;
  bool is_angle_metal = false;
  bool is_angle_swiftshader = false;
  bool is_angle_vulkan = false;
  unsigned major_version = 0;
  unsigned minor_version = 0;
  bool is_es2 = false;
  bool is_es3 = false;
  std::string driver_vendor;
  std::string driver_version;

 private:
  void Initialize(const char* version_str,
                  const char* renderer_str,
                  const gfx::ExtensionSet& extensions);
  void ParseVersionString(const char* version_str);
  void ParseDriverInfo(const char* version_str);
  void ExtractDriverVendorANGLE(const char* renderer_str);
};

}  // namespace gl

#endif // UI_GL_GL_VERSION_INFO_H_