paulxstretch/deps/juce/modules/juce_opengl/opengl/juce_OpenGLHelpers.cpp
essej 25bd5d8adb 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"
2022-04-18 17:51:22 -04:00

227 lines
6.1 KiB
C++

/*
==============================================================================
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