QGLExtensionMatcher Class Reference

#include <qgl_p.h>

Public Functions
bool	match (const char *str) const

Properties
QByteArray	m_extensions
QVector< int >	m_offsets
	QGLExtensionMatcher (const char *str)
	QGLExtensionMatcher ()
void	init (const char *str)

Detailed Description

Definition at line 900 of file qgl_p.h.

Constructors and Destructors

QGLExtensionMatcher() [1/2]

QGLExtensionMatcher::QGLExtensionMatcher

(

const char *

str

)

Definition at line 5619 of file qgl.cpp.

{
    init(str);
}

QGLExtensionMatcher() [2/2]

QGLExtensionMatcher::QGLExtensionMatcher

(

)

Definition at line 5624 of file qgl.cpp.

{
    const char *extensionStr = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));

    if (extensionStr) {
        init(extensionStr);
    } else {
        // clear error state
        while (glGetError()) {}

        const QGLContext *ctx = QGLContext::currentContext();
        if (ctx) {
            qt_glGetStringi glGetStringi = (qt_glGetStringi)ctx->getProcAddress(QLatin1String("glGetStringi"));

            GLint numExtensions;
            glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);

            for (int i = 0; i < numExtensions; ++i) {
                const char *str = reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i));

                m_offsets << m_extensions.size();

                while (*str != 0)
                    m_extensions.append(*str++);
                m_extensions.append(' ');
            }
        }
    }
}

Functions

init()

void QGLExtensionMatcher::init ( const char *  str )

private

Definition at line 5654 of file qgl.cpp.

{
    m_extensions = str;

    // make sure extension string ends with a space
    if (!m_extensions.endsWith(' '))
        m_extensions.append(' ');

    int index = 0;
    int next = 0;
    while ((next = m_extensions.indexOf(' ', index)) >= 0) {
        m_offsets << index;
        index = next + 1;
    }
}

match()

bool QGLExtensionMatcher::match ( const char *  str ) const

inline

Definition at line 906 of file qgl_p.h.

Referenced by QGL2PaintEngineEx::begin(), buildSpec(), qgl_use_font(), qglx_getProcAddress(), qt_gl_resolve_features(), qt_resolve_buffer_extensions(), and QGLContext::tryVisual().

                                      {
        int str_length = qstrlen(str);

        Q_ASSERT(str);
        Q_ASSERT(str_length > 0);
        Q_ASSERT(str[str_length-1] != ' ');

        for (int i = 0; i < m_offsets.size(); ++i) {
            const char *extension = m_extensions.constData() + m_offsets.at(i);
            if (qstrncmp(extension, str, str_length) == 0 && extension[str_length] == ' ')
                return true;
        }
        return false;
    }

Properties

m_extensions

QByteArray QGLExtensionMatcher::m_extensions

private

Definition at line 924 of file qgl_p.h.

m_offsets

QVector<int> QGLExtensionMatcher::m_offsets

private

Definition at line 925 of file qgl_p.h.

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The documentation for this class was generated from the following files:

• /src/opengl/qgl_p.h
• /src/opengl/qgl.cpp