| // 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), |
| is_swiftshader(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_swiftshader = base::StartsWith(renderer_str, "Google SwiftShader", |
| 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 |