Gui: Add class Multisample to check supported MSAA modes

2024-07-11 16:40:55 +02:00
parent 9eeca1f6ad
commit 692d84a085
3 changed files with 177 additions and 0 deletions
--- a/src/Gui/Multisample.cpp
+++ b/src/Gui/Multisample.cpp
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/***************************************************************************
+ *   Copyright (c) 2024 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *                                                                         *
+ *   This file is part of FreeCAD.                                         *
+ *                                                                         *
+ *   FreeCAD is free software: you can redistribute it and/or modify it    *
+ *   under the terms of the GNU Lesser General Public License as           *
+ *   published by the Free Software Foundation, either version 2.1 of the  *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   FreeCAD is distributed in the hope that it will be useful, but        *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with FreeCAD. If not, see                               *
+ *   <https://www.gnu.org/licenses/>.                                      *
+ *                                                                         *
+ **************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#include <QCoreApplication>
+#include <QOpenGLFramebufferObjectFormat>
+#endif
+
+#include "Multisample.h"
+
+using namespace Gui;
+
+// clang-format off
+static constexpr auto numMSAA {6};
+static constexpr auto idStr {0};
+static constexpr auto idEnum {1};
+static constexpr auto idMSAA {2};
+static constexpr std::array<std::tuple<std::string_view, AntiAliasing, int>, numMSAA> textMSAA {{
+    {QT_TRANSLATE_NOOP("Gui::Dialog::DlgSettings3DView", "None"), AntiAliasing::None, 0},
+    {QT_TRANSLATE_NOOP("Gui::Dialog::DlgSettings3DView", "Line Smoothing"), AntiAliasing::MSAA1x, 1},
+    {QT_TRANSLATE_NOOP("Gui::Dialog::DlgSettings3DView", "MSAA 2x"), AntiAliasing::MSAA2x, 2},
+    {QT_TRANSLATE_NOOP("Gui::Dialog::DlgSettings3DView", "MSAA 4x"), AntiAliasing::MSAA4x, 4},
+    {QT_TRANSLATE_NOOP("Gui::Dialog::DlgSettings3DView", "MSAA 6x"), AntiAliasing::MSAA6x, 6},
+    {QT_TRANSLATE_NOOP("Gui::Dialog::DlgSettings3DView", "MSAA 8x"), AntiAliasing::MSAA8x, 8},
+}};
+// clang-format on
+
+Multisample::Multisample()
+{
+    context.setFormat(format);
+    context.create();
+    offscreen.setFormat(format);
+    offscreen.create();
+    context.makeCurrent(&offscreen);
+}
+
+bool Multisample::testSamples(int num) const
+{
+    // This is always true
+    if (num == 0 || num == 1) {
+        return true;
+    }
+
+    QOpenGLFramebufferObjectFormat fboFormat;
+    fboFormat.setAttachment(QOpenGLFramebufferObject::Depth);
+    fboFormat.setSamples(num);
+    QOpenGLFramebufferObject fbo(100, 100, fboFormat);  // NOLINT
+    return fbo.format().samples() == num;
+}
+
+std::vector<std::pair<QString, AntiAliasing>> Multisample::supported() const
+{
+    std::vector<std::pair<QString, AntiAliasing>> modes;
+    std::for_each(textMSAA.begin(), textMSAA.end(), [&modes, this](const auto& mode) {
+        if (testSamples(std::get<idMSAA>(mode))) {
+            const char* context = "Gui::Dialog::DlgSettings3DView";
+            QString str = QCoreApplication::translate(context, std::get<idStr>(mode).data());
+            modes.emplace_back(str, std::get<idEnum>(mode));
+        }
+    });
+    return modes;
+}
+
+int Multisample::toSamples(AntiAliasing msaa)
+{
+    auto it = std::find_if(textMSAA.begin(), textMSAA.end(), [msaa](const auto& mode) {
+        return std::get<idEnum>(mode) == msaa;
+    });
+    if (it != textMSAA.end()) {
+        return std::get<idMSAA>(*it);
+    }
+    return 0;
+}
+
+AntiAliasing Multisample::toAntiAliasing(int samples)
+{
+    auto it = std::find_if(textMSAA.begin(), textMSAA.end(), [samples](const auto& mode) {
+        return std::get<idMSAA>(mode) == samples;
+    });
+    if (it != textMSAA.end()) {
+        return std::get<idEnum>(*it);
+    }
+    return AntiAliasing::None;
+}