- Qt 5.15
- Qt OpenGL
- C++ Classes
- QGLShader
- Qt 5.15.18 Reference Documentation

# QGLShader Class

The QGLShader class allows OpenGL shaders to be compiled. More...

Header: | #include <QGLShader>
qmake: | QT += opengl
Since: | Qt 4.6
Inherits: | QObject

This class is obsolete. It is provided to keep old source code working. We strongly advise against using it in new code.

This class was introduced in Qt 4.6.

- List of all members, including inherited members

## Public Types

flags | ShaderType
enum | ShaderTypeBit { Vertex, Fragment, Geometry }

## Public Functions

| QGLShader(QGLShader::ShaderType type, const QGLContext *context, QObject *parent = nullptr)
| QGLShader(QGLShader::ShaderType type, QObject *parent = nullptr)
virtual | ~QGLShader()
bool | compileSourceCode(const char *source)
bool | compileSourceCode(const QByteArray &source)
bool | compileSourceCode(const QString &source)
bool | compileSourceFile(const QString &fileName)
bool | isCompiled() const
QString | log() const
GLuint | shaderId() const
QGLShader::ShaderType | shaderType() const
QByteArray | sourceCode() const

## Static Public Members

bool | hasOpenGLShaders(ShaderType type, const QGLContext *context = nullptr)

## Detailed Description

This class supports shaders written in the OpenGL Shading Language (GLSL) and in the OpenGL/ES Shading Language (GLSL/ES).

QGLShader and QGLShaderProgram shelter the programmer from the details of compiling and linking vertex and fragment shaders.

Note: This class has been deprecated in favor of QOpenGLShader.

See also QGLShaderProgram.

## Member Type Documentation

### enum QGLShader::ShaderTypeBit
flags QGLShader::ShaderType

This enum specifies the type of QGLShader that is being created.

Constant | Value | Description
--- | --- | ---
`QGLShader::Vertex` | `0x0001` | Vertex shader written in the OpenGL Shading Language (GLSL).
`QGLShader::Fragment` | `0x0002` | Fragment shader written in the OpenGL Shading Language (GLSL).
`QGLShader::Geometry` | `0x0004` | Geometry shaders written in the OpenGL Shading Language (GLSL), based on the GL_EXT_geometry_shader4 extension.

The ShaderType type is a typedef for QFlags<ShaderTypeBit>. It stores an OR combination of ShaderTypeBit values.

## Member Function Documentation

### QGLShader::QGLShader(QGLShader::ShaderType type, const QGLContext *context, QObject *parent = nullptr)

Constructs a new QGLShader object of the specified type and attaches it to parent. If shader programs are not supported, then QGLShaderProgram::hasOpenGLShaderPrograms() will return false.

This constructor is normally followed by a call to compileSourceCode() or compileSourceFile().

The shader will be associated with context.

See also compileSourceCode() and compileSourceFile().

### QGLShader::QGLShader(QGLShader::ShaderType type, QObject *parent = nullptr)

Constructs a new QGLShader object of the specified type and attaches it to parent. If shader programs are not supported, QGLShaderProgram::hasOpenGLShaderPrograms() will return false.

This constructor is normally followed by a call to compileSourceCode() or compileSourceFile().

The shader will be associated with the current QGLContext.

See also compileSourceCode() and compileSourceFile().

### `[virtual]` QGLShader::~QGLShader()

Deletes this shader. If the shader has been attached to a QGLShaderProgram object, then the actual shader will stay around until the QGLShaderProgram is destroyed.

### bool QGLShader::compileSourceCode(const char *source)

Sets the source code for this shader and compiles it. Returns `true` if the source was successfully compiled, false otherwise.

See also compileSourceFile().

### bool QGLShader::compileSourceCode(const QByteArray &source)

This is an overloaded function.

Sets the source code for this shader and compiles it. Returns `true` if the source was successfully compiled, false otherwise.

See also compileSourceFile().

### bool QGLShader::compileSourceCode(const QString &source)

This is an overloaded function.

Sets the source code for this shader and compiles it. Returns `true` if the source was successfully compiled, false otherwise.

See also compileSourceFile().

### bool QGLShader::compileSourceFile(const QString &fileName)

Sets the source code for this shader to the contents of fileName and compiles it. Returns `true` if the file could be opened and the source compiled, false otherwise.

See also compileSourceCode().

### `[static]` bool QGLShader::hasOpenGLShaders(ShaderType type, const QGLContext *context = nullptr)

Returns `true` if shader programs of type type are supported on this system; false otherwise.

The context is used to resolve the GLSL extensions. If context is `nullptr`, then QGLContext::currentContext() is used.

This function was introduced in Qt 4.7.

### bool QGLShader::isCompiled() const

Returns `true` if this shader has been compiled; false otherwise.

See also compileSourceCode() and compileSourceFile().

### QString QGLShader::log() const

Returns the errors and warnings that occurred during the last compile.

See also compileSourceCode() and compileSourceFile().

### GLuint QGLShader::shaderId() const

Returns the OpenGL identifier associated with this shader.

See also QGLShaderProgram::programId().

### QGLShader::ShaderType QGLShader::shaderType() const

Returns the type of this shader.

### QByteArray QGLShader::sourceCode() const

Returns the source code for this shader.

See also compileSourceCode().