QOpenGLShader Class

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

Header:	#include <QOpenGLShader>
CMake:	find_package(Qt6 COMPONENTS OpenGL REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::OpenGL)
qmake:	QT += opengl
Since:	Qt 5.0
Inherits:	QObject

• List of all members, including inherited members

Public Types

flags	ShaderType
enum	ShaderTypeBit { Vertex, Fragment, Geometry, TessellationControl, TessellationEvaluation, Compute }

Public Functions

	QOpenGLShader(QOpenGLShader::ShaderType type, QObject *parent = nullptr)
virtual	~QOpenGLShader()
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
QOpenGLShader::ShaderType	shaderType() const
QByteArray	sourceCode() const

Static Public Members

bool	hasOpenGLShaders(QOpenGLShader::ShaderType type, QOpenGLContext *context = nullptr)

Detailed Description

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

QOpenGLShader and QOpenGLShaderProgram shelter the programmer from the details of compiling and linking vertex and fragment shaders.

See also QOpenGLShaderProgram.

Member Type Documentation

enum QOpenGLShader::ShaderTypeBitflags QOpenGLShader::ShaderType

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

Constant	Value	Description
QOpenGLShader::Vertex	0x0001	Vertex shader written in the OpenGL Shading Language (GLSL).
QOpenGLShader::Fragment	0x0002	Fragment shader written in the OpenGL Shading Language (GLSL).
QOpenGLShader::Geometry	0x0004	Geometry shaders written in the OpenGL Shading Language (GLSL) (requires OpenGL >= 3.2 or OpenGL ES >= 3.2).
QOpenGLShader::TessellationControl	0x0008	Tessellation control shaders written in the OpenGL shading language (GLSL) (requires OpenGL >= 4.0 or OpenGL ES >= 3.2).
QOpenGLShader::TessellationEvaluation	0x0010	Tessellation evaluation shaders written in the OpenGL shading language (GLSL) (requires OpenGL >= 4.0 or OpenGL ES >= 3.2).
QOpenGLShader::Compute	0x0020	Compute shaders written in the OpenGL shading language (GLSL) (requires OpenGL >= 4.3 or OpenGL ES >= 3.1).

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

Member Function Documentation

QOpenGLShader::QOpenGLShader(QOpenGLShader::ShaderType type, QObject *parent = nullptr)

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

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

The shader will be associated with the current QOpenGLContext.

See also compileSourceCode() and compileSourceFile().

[virtual] QOpenGLShader::~QOpenGLShader()

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

bool QOpenGLShader::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 QOpenGLShader::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 QOpenGLShader::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 QOpenGLShader::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 QOpenGLShader::hasOpenGLShaders(QOpenGLShader::ShaderType type, QOpenGLContext *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 QOpenGLContext::currentContext() is used.

bool QOpenGLShader::isCompiled() const

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

See also compileSourceCode() and compileSourceFile().

QString QOpenGLShader::log() const

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

See also compileSourceCode() and compileSourceFile().

GLuint QOpenGLShader::shaderId() const

Returns the OpenGL identifier associated with this shader.

See also QOpenGLShaderProgram::programId().

QOpenGLShader::ShaderType QOpenGLShader::shaderType() const

Returns the type of this shader.

QByteArray QOpenGLShader::sourceCode() const

Returns the source code for this shader.

See also compileSourceCode().