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Added check to context creation to warn the user of an incompatible mismatch between the context they requested and the context that was created.

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This commit is contained in:
binary1248 2015-01-12 18:59:24 +01:00
parent 6b3c7f0cd6
commit 1d16748ed7
2 changed files with 61 additions and 0 deletions
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54
src/SFML/Window/GlContext.cpp
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@ -29,6 +29,7 @@
#include <SFML/System/ThreadLocalPtr.hpp>
#include <SFML/System/Mutex.hpp>
#include <SFML/System/Lock.hpp>
#include <SFML/System/Err.hpp>
#include <SFML/OpenGL.hpp>
#include <set>
#include <cstdlib>
@ -194,6 +195,7 @@ GlContext* GlContext::create(const ContextSettings& settings, const WindowImpl*
// Create the context
GlContext* context = new ContextType(sharedContext, settings, owner, bitsPerPixel);
context->initialize();
context->checkSettings(settings);
return context;
}
@ -208,6 +210,7 @@ GlContext* GlContext::create(const ContextSettings& settings, unsigned int width
// Create the context
GlContext* context = new ContextType(sharedContext, settings, width, height);
context->initialize();
context->checkSettings(settings);
return context;
}
@ -354,6 +357,57 @@ void GlContext::initialize()
glEnable(GL_MULTISAMPLE);
}
////////////////////////////////////////////////////////////
void GlContext::checkSettings(const ContextSettings& requestedSettings)
{
// Perform checks to inform the user if they are getting a context they might not have expected
// 3.0 contexts only deprecate features, but do not remove them yet
// 3.1 contexts remove features if ARB_compatibility is not present (we assume it isn't for simplicity)
// 3.2+ contexts remove features only if a core profile is requested
// If the context was created with wglCreateContext, it is guaranteed to be compatibility.
// If a 3.2+ context was created with wglCreateContextAttribsARB, the compatibility flag
// would have been set correctly already depending on whether ARB_create_context_profile is supported.
// If the user requests a 3.0 context, it will be a compatibility context regardless of the requested profile.
// If the user requests a 3.1 context and its creation was successful, the specification
// states that it will not be a compatibility profile context regardless of the requested profile.
if ((m_settings.majorVersion == 3) && (m_settings.minorVersion == 0))
m_settings.attributeFlags &= ~ContextSettings::Core;
else if ((m_settings.majorVersion == 3) && (m_settings.minorVersion == 1))
m_settings.attributeFlags |= ContextSettings::Core;
int version = m_settings.majorVersion * 10 + m_settings.minorVersion;
int requestedVersion = requestedSettings.majorVersion * 10 + requestedSettings.minorVersion;
if ((m_settings.attributeFlags != requestedSettings.attributeFlags) ||
(version < requestedVersion) ||
(m_settings.stencilBits < requestedSettings.stencilBits) ||
(m_settings.antialiasingLevel < requestedSettings.antialiasingLevel) ||
(m_settings.depthBits < requestedSettings.depthBits))
{
err() << "Warning: The created OpenGL context does not fully meet the settings that were requested" << std::endl;
err() << "Requested: version = " << requestedSettings.majorVersion << "." << requestedSettings.minorVersion
<< " ; depth bits = " << requestedSettings.depthBits
<< " ; stencil bits = " << requestedSettings.stencilBits
<< " ; AA level = " << requestedSettings.antialiasingLevel
<< std::boolalpha
<< " ; core = " << ((requestedSettings.attributeFlags & ContextSettings::Core) != 0)
<< " ; debug = " << ((requestedSettings.attributeFlags & ContextSettings::Debug) != 0)
<< std::noboolalpha << std::endl;
err() << "Created: version = " << m_settings.majorVersion << "." << m_settings.minorVersion
<< " ; depth bits = " << m_settings.depthBits
<< " ; stencil bits = " << m_settings.stencilBits
<< " ; AA level = " << m_settings.antialiasingLevel
<< std::boolalpha
<< " ; core = " << ((m_settings.attributeFlags & ContextSettings::Core) != 0)
<< " ; debug = " << ((m_settings.attributeFlags & ContextSettings::Debug) != 0)
<< std::noboolalpha << std::endl;
}
}
} // namespace priv
} // namespace sf

7
src/SFML/Window/GlContext.hpp
View File

@ -234,6 +234,13 @@ private:
///
////////////////////////////////////////////////////////////
void initialize();
////////////////////////////////////////////////////////////
/// \brief Check whether the context is compatible with the requested settings
/// \param requestedSettings Requested settings during context creation
///
////////////////////////////////////////////////////////////
void checkSettings(const ContextSettings& requestedSettings);
};
} // namespace priv