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// Copyright 2014 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.
#include "ui/gl/gl_version_info.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
namespace {
bool DesktopCoreCommonCheck(
bool is_es, unsigned major_version, unsigned minor_version) {
return (!is_es &&
((major_version == 3 && minor_version >= 2) ||
major_version > 3));
}
}
namespace gl {
GLVersionInfo::GLVersionInfo(const char* version_str,
const char* renderer_str,
const char* extensions_str)
: GLVersionInfo() {
std::set<std::string> extensions;
if (extensions_str) {
auto split = base::SplitString(extensions_str, " ", base::KEEP_WHITESPACE,
base::SPLIT_WANT_NONEMPTY);
extensions.insert(split.begin(), split.end());
}
Initialize(version_str, renderer_str, extensions);
}
GLVersionInfo::GLVersionInfo(const char* version_str,
const char* renderer_str,
const std::set<std::string>& extensions)
: GLVersionInfo() {
Initialize(version_str, renderer_str, extensions);
}
GLVersionInfo::GLVersionInfo()
: is_es(false),
is_angle(false),
is_mesa(false),
major_version(0),
minor_version(0),
is_es2(false),
is_es3(false),
is_desktop_core_profile(false),
is_es3_capable(false) {}
void GLVersionInfo::Initialize(const char* version_str,
const char* renderer_str,
const std::set<std::string>& extensions) {
if (version_str) {
ParseVersionString(version_str, &major_version, &minor_version,
&is_es, &is_es2, &is_es3);
}
if (renderer_str) {
is_angle = base::StartsWith(renderer_str, "ANGLE",
base::CompareCase::SENSITIVE);
is_mesa = base::StartsWith(renderer_str, "Mesa",
base::CompareCase::SENSITIVE);
}
is_desktop_core_profile =
DesktopCoreCommonCheck(is_es, major_version, minor_version) &&
extensions.find("GL_ARB_compatibility") == extensions.end();
is_es3_capable = IsES3Capable(extensions);
}
bool GLVersionInfo::IsES3Capable(
const std::set<std::string>& extensions) const {
auto has_extension = [&extensions](std::string extension) -> bool {
return extensions.find(extension) != extensions.end();
};
// Version ES3 capable without extensions needed.
if (IsAtLeastGLES(3, 0) || IsAtLeastGL(4, 2)) {
return true;
}
// Don't try supporting ES3 on ES2, or desktop before 3.3.
if (is_es || !IsAtLeastGL(3, 3)) {
return false;
}
bool has_transform_feedback =
(IsAtLeastGL(4, 0) || has_extension("GL_ARB_transform_feedback2"));
// This code used to require the GL_ARB_gpu_shader5 extension in order to
// have support for dynamic indexing of sampler arrays, which was
// optionally supported in ESSL 1.00. However, since this is expressly
// forbidden in ESSL 3.00, and some desktop drivers (specifically
// Mesa/Gallium on AMD GPUs) don't support it, we no longer require it.
// tex storage is available in core spec since GL 4.2.
bool has_tex_storage = has_extension("GL_ARB_texture_storage");
// TODO(cwallez) check for texture related extensions. See crbug.com/623577
return (has_transform_feedback && has_tex_storage);
}
void GLVersionInfo::ParseVersionString(const char* version_str,
unsigned* major_version,
unsigned* minor_version,
bool* is_es,
bool* is_es2,
bool* is_es3) {
// Make sure the outputs are always initialized.
*major_version = 0;
*minor_version = 0;
*is_es = false;
*is_es2 = false;
*is_es3 = false;
if (!version_str)
return;
std::string lstr(base::ToLowerASCII(version_str));
*is_es = (lstr.length() > 12) && (lstr.substr(0, 9) == "opengl es");
if (*is_es)
lstr = lstr.substr(10, 3);
base::StringTokenizer tokenizer(lstr.begin(), lstr.end(), ". ");
unsigned major, minor;
if (tokenizer.GetNext() &&
base::StringToUint(tokenizer.token_piece(), &major)) {
*major_version = major;
if (tokenizer.GetNext() &&
base::StringToUint(tokenizer.token_piece(), &minor)) {
*minor_version = minor;
}
}
if (*is_es && *major_version == 2)
*is_es2 = true;
if (*is_es && *major_version == 3)
*is_es3 = true;
DCHECK(major_version != 0);
}
} // namespace gl
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