git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce

subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"

deps/juce/modules/juce_opengl/opengl/juce_OpenGLHelpers.cpp

@@ -0,0 +1,226 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2020 - Raw Material Software Limited
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   By using JUCE, you agree to the terms of both the JUCE 6 End-User License
+   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
+
+   End User License Agreement: www.juce.com/juce-6-licence
+   Privacy Policy: www.juce.com/juce-privacy-policy
+
+   Or: You may also use this code under the terms of the GPL v3 (see
+   www.gnu.org/licenses).
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+class Version
+{
+public:
+    constexpr Version() = default;
+
+    constexpr explicit Version (int majorIn)
+        : Version (majorIn, 0) {}
+
+    constexpr Version (int majorIn, int minorIn)
+        : major (majorIn), minor (minorIn) {}
+
+    int major = 0, minor = 0;
+
+    constexpr bool operator== (const Version& other) const noexcept
+    {
+        return toTuple() == other.toTuple();
+    }
+
+    constexpr bool operator!= (const Version& other) const noexcept
+    {
+        return toTuple() != other.toTuple();
+    }
+
+    constexpr bool operator< (const Version& other) const noexcept
+    {
+        return toTuple() < other.toTuple();
+    }
+
+    constexpr bool operator<= (const Version& other) const noexcept
+    {
+        return toTuple() <= other.toTuple();
+    }
+
+    constexpr bool operator> (const Version& other) const noexcept
+    {
+        return toTuple() > other.toTuple();
+    }
+
+    constexpr bool operator>= (const Version& other) const noexcept
+    {
+        return toTuple() >= other.toTuple();
+    }
+
+private:
+    constexpr std::tuple<int, int> toTuple() const noexcept
+    {
+        return std::make_tuple (major, minor);
+    }
+};
+
+
+template <typename Char>
+static auto* findNullTerminator (const Char* ptr)
+{
+    while (*ptr != 0)
+        ++ptr;
+
+    return ptr;
+}
+
+static Version getOpenGLVersion()
+{
+    const auto* versionBegin = glGetString (GL_VERSION);
+
+    if (versionBegin == nullptr)
+        return {};
+
+    const auto* versionEnd = findNullTerminator (versionBegin);
+    const std::string versionString (versionBegin, versionEnd);
+    const auto spaceSeparated = StringArray::fromTokens (versionString.c_str(), false);
+
+    if (spaceSeparated.isEmpty())
+        return {};
+
+    const auto pointSeparated = StringArray::fromTokens (spaceSeparated[0], ".", "");
+
+    const auto major = pointSeparated[0].getIntValue();
+    const auto minor = pointSeparated[1].getIntValue();
+
+    return { major, minor };
+}
+
+void OpenGLHelpers::resetErrorState()
+{
+    while (glGetError() != GL_NO_ERROR) {}
+}
+
+void* OpenGLHelpers::getExtensionFunction (const char* functionName)
+{
+   #if JUCE_WINDOWS
+    return (void*) wglGetProcAddress (functionName);
+   #elif JUCE_LINUX || JUCE_BSD
+    return (void*) glXGetProcAddress ((const GLubyte*) functionName);
+   #else
+    static void* handle = dlopen (nullptr, RTLD_LAZY);
+    return dlsym (handle, functionName);
+   #endif
+}
+
+bool OpenGLHelpers::isExtensionSupported (const char* const extensionName)
+{
+    jassert (extensionName != nullptr); // you must supply a genuine string for this.
+    jassert (isContextActive()); // An OpenGL context will need to be active before calling this.
+
+    const char* extensions = (const char*) glGetString (GL_EXTENSIONS);
+    jassert (extensions != nullptr); // Perhaps you didn't activate an OpenGL context before calling this?
+
+    for (;;)
+    {
+        const char* found = strstr (extensions, extensionName);
+
+        if (found == nullptr)
+            break;
+
+        extensions = found + strlen (extensionName);
+
+        if (extensions[0] == ' ' || extensions[0] == 0)
+            return true;
+    }
+
+    return false;
+}
+
+void OpenGLHelpers::clear (Colour colour)
+{
+    glClearColor (colour.getFloatRed(), colour.getFloatGreen(),
+                  colour.getFloatBlue(), colour.getFloatAlpha());
+
+    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+}
+
+void OpenGLHelpers::enableScissorTest (Rectangle<int> clip)
+{
+    glEnable (GL_SCISSOR_TEST);
+    glScissor (clip.getX(), clip.getY(), clip.getWidth(), clip.getHeight());
+}
+
+String OpenGLHelpers::getGLSLVersionString()
+{
+    if (getOpenGLVersion() >= Version (3, 2))
+    {
+       #if JUCE_OPENGL_ES
+        return "#version 300 es";
+       #else
+        return "#version 150";
+       #endif
+    }
+
+    return "#version 110";
+}
+
+String OpenGLHelpers::translateVertexShaderToV3 (const String& code)
+{
+    if (getOpenGLVersion() >= Version (3, 2))
+    {
+        String output;
+
+       #if JUCE_ANDROID
+        {
+            int numAttributes = 0;
+
+            for (int p = code.indexOf (0, "attribute "); p >= 0; p = code.indexOf (p + 1, "attribute "))
+                numAttributes++;
+
+            int last = 0;
+
+            for (int p = code.indexOf (0, "attribute "); p >= 0; p = code.indexOf (p + 1, "attribute "))
+            {
+                output += code.substring (last, p) + "layout(location=" + String (--numAttributes) + ") in ";
+
+                last = p + 10;
+            }
+
+            output += code.substring (last);
+        }
+       #else
+        output = code.replace ("attribute", "in");
+       #endif
+
+        return getGLSLVersionString() + "\n" + output.replace ("varying", "out");
+    }
+
+    return code;
+}
+
+String OpenGLHelpers::translateFragmentShaderToV3 (const String& code)
+{
+    if (getOpenGLVersion() >= Version (3, 2))
+        return getGLSLVersionString() + "\n"
+               "out " JUCE_MEDIUMP " vec4 fragColor;\n"
+                + code.replace ("varying", "in")
+                      .replace ("texture2D", "texture")
+                      .replace ("gl_FragColor", "fragColor");
+
+    return code;
+}
+
+} // namespace juce