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QShaderProgram Class

class Qt3DRender::QShaderProgram

Encapsulates a Shader Program. More...

Header: #include <QShaderProgram>
qmake: QT += 3drender
Since: Qt 5.5
Instantiated By: ShaderProgram
Inherits: Qt3DCore::QNode

This class was introduced in Qt 5.5.

Public Types

enum Format { GLSL, SPIRV }
enum ShaderType { Vertex, Fragment, TessellationControl, TessellationEvaluation, Geometry, Compute }
enum Status { NotReady, Ready, Error }

Properties

Public Functions

QByteArray computeShaderCode() const
Qt3DRender::QShaderProgram::Format format() const
QByteArray fragmentShaderCode() const
QByteArray geometryShaderCode() const
QString log() const
void setFormat(Qt3DRender::QShaderProgram::Format format)
void setShaderCode(Qt3DRender::QShaderProgram::ShaderType type, const QByteArray &shaderCode)
QByteArray shaderCode(Qt3DRender::QShaderProgram::ShaderType type) const
Qt3DRender::QShaderProgram::Status status() const
QByteArray tessellationControlShaderCode() const
QByteArray tessellationEvaluationShaderCode() const
QByteArray vertexShaderCode() const

Public Slots

void setComputeShaderCode(const QByteArray &computeShaderCode)
void setFragmentShaderCode(const QByteArray &fragmentShaderCode)
void setGeometryShaderCode(const QByteArray &geometryShaderCode)
void setTessellationControlShaderCode(const QByteArray &tessellationControlShaderCode)
void setTessellationEvaluationShaderCode(const QByteArray &tessellationEvaluationShaderCode)
void setVertexShaderCode(const QByteArray &vertexShaderCode)

Signals

void computeShaderCodeChanged(const QByteArray &computeShaderCode)
void formatChanged(Qt3DRender::QShaderProgram::Format format)
void fragmentShaderCodeChanged(const QByteArray &fragmentShaderCode)
void geometryShaderCodeChanged(const QByteArray &geometryShaderCode)
void logChanged(const QString &log)
void statusChanged(Qt3DRender::QShaderProgram::Status status)
void tessellationControlShaderCodeChanged(const QByteArray &tessellationControlShaderCode)
void tessellationEvaluationShaderCodeChanged(const QByteArray &tessellationEvaluationShaderCode)
void vertexShaderCodeChanged(const QByteArray &vertexShaderCode)

Static Public Members

QByteArray loadSource(const QUrl &sourceUrl)

Reimplemented Protected Functions

virtual void sceneChangeEvent(const Qt3DCore::QSceneChangePtr &change) override

Detailed Description

A shader program consists of several different shaders, such as vertex and fragment shaders.

Qt3D will automatically populate a set of default uniforms if they are encountered during the shader instrospection phase.

Default Uniform Associated Qt3D Parameter name GLSL declaration
ModelMatrix modelMatrix uniform mat4 modelMatrix;
ViewMatrix viewMatrix uniform mat4 viewMatrix;
ProjectionMatrix projectionMatrix uniform mat4 projectionMatrix;
ModelViewMatrix modelView uniform mat4 modelView;
ViewProjectionMatrix viewProjectionMatrix uniform mat4 viewProjectionMatrix;
ModelViewProjectionMatrix modelViewProjection mvp uniform mat4 modelViewProjection; uniform mat4 mvp;
InverseModelMatrix inverseModelMatrix uniform mat4 inverseModelMatrix;
InverseViewMatrix inverseViewMatrix uniform mat4 inverseViewMatrix;
InverseProjectionMatrix inverseProjectionMatrix uniform mat4 inverseProjectionMatrix;
InverseModelViewMatrix inverseModelView uniform mat4 inverseModelView;
InverseViewProjectionMatrix inverseViewProjectionMatrix uniform mat4 inverseViewProjectionMatrix;
InverseModelViewProjectionMatrix inverseModelViewProjection uniform mat4 inverseModelViewProjection;
ModelNormalMatrix modelNormalMatrix uniform mat3 modelNormalMatrix;
ModelViewNormalMatrix modelViewNormal uniform mat3 modelViewNormal;
ViewportMatrix viewportMatrix uniform mat4 viewportMatrix;
InverseViewportMatrix inverseViewportMatrix uniform mat4 inverseViewportMatrix;
AspectRatio (surface width / surface height) aspectRatio uniform float aspectRatio;
Exposure exposure uniform float exposure;
Gamma gamma uniform float gamma;
Time (in nano seconds) time uniform float time;
EyePosition eyePosition uniform vec3 eyePosition;
SkinningPalette skinningPalette[0] const int maxJoints = 100; uniform mat4 skinningPalette[maxJoints];

Member Type Documentation

enum QShaderProgram::Format

This enum identifies the format of the shader code used.

Constant Value Description
Qt3DRender::QShaderProgram::GLSL 0 OpenGL
Qt3DRender::QShaderProgram::SPIRV 1 Vulkan, OpenGL 5

This enum was introduced or modified in Qt 5.15.

enum QShaderProgram::ShaderType

This enum identifies the type of shader used.

Constant Value Description
Qt3DRender::QShaderProgram::Vertex 0 Vertex shader
Qt3DRender::QShaderProgram::Fragment 1 Fragment shader
Qt3DRender::QShaderProgram::TessellationControl 2 Tesselation control shader
Qt3DRender::QShaderProgram::TessellationEvaluation 3 Tesselation evaluation shader
Qt3DRender::QShaderProgram::Geometry 4 Geometry shader
Qt3DRender::QShaderProgram::Compute 5 Compute shader

enum QShaderProgram::Status

This enum identifies the status of shader used.

Constant Value Description
Qt3DRender::QShaderProgram::NotReady 0 The shader hasn't been compiled and linked yet
Qt3DRender::QShaderProgram::Ready 1 The shader was successfully compiled
Qt3DRender::QShaderProgram::Error 2 An error occurred while compiling the shader

Property Documentation

computeShaderCode : QByteArray

Holds the compute shader code used by this shader program.

Access functions:

QByteArray computeShaderCode() const
void setComputeShaderCode(const QByteArray &computeShaderCode)

Notifier signal:

void computeShaderCodeChanged(const QByteArray &computeShaderCode)

format : Format

Holds the format of the code provided on the ShaderProgram. The default is ShaderProgram.GLSL

This property was introduced in Qt 5.15.

Access functions:

Qt3DRender::QShaderProgram::Format format() const
void setFormat(Qt3DRender::QShaderProgram::Format format)

Notifier signal:

void formatChanged(Qt3DRender::QShaderProgram::Format format)

fragmentShaderCode : QByteArray

Holds the fragment shader code used by this shader program.

Access functions:

QByteArray fragmentShaderCode() const
void setFragmentShaderCode(const QByteArray &fragmentShaderCode)

Notifier signal:

void fragmentShaderCodeChanged(const QByteArray &fragmentShaderCode)

geometryShaderCode : QByteArray

Holds the geometry shader code used by this shader program.

Access functions:

QByteArray geometryShaderCode() const
void setGeometryShaderCode(const QByteArray &geometryShaderCode)

Notifier signal:

void geometryShaderCodeChanged(const QByteArray &geometryShaderCode)

log : const QString

Holds the log of the current shader program. This is useful to diagnose a compilation failure of the shader program.

Access functions:

QString log() const

Notifier signal:

void logChanged(const QString &log)

status : const Status

Holds the status of the current shader program.

Access functions:

Qt3DRender::QShaderProgram::Status status() const

Notifier signal:

void statusChanged(Qt3DRender::QShaderProgram::Status status)

tessellationControlShaderCode : QByteArray

Holds the tesselation control shader code used by this shader program.

Access functions:

QByteArray tessellationControlShaderCode() const
void setTessellationControlShaderCode(const QByteArray &tessellationControlShaderCode)

Notifier signal:

void tessellationControlShaderCodeChanged(const QByteArray &tessellationControlShaderCode)

tessellationEvaluationShaderCode : QByteArray

Holds the tesselation evaluation shader code used by this shader program.

Access functions:

QByteArray tessellationEvaluationShaderCode() const
void setTessellationEvaluationShaderCode(const QByteArray &tessellationEvaluationShaderCode)

Notifier signal:

void tessellationEvaluationShaderCodeChanged(const QByteArray &tessellationEvaluationShaderCode)

vertexShaderCode : QByteArray

Holds the vertex shader code used by this shader program.

Access functions:

QByteArray vertexShaderCode() const
void setVertexShaderCode(const QByteArray &vertexShaderCode)

Notifier signal:

void vertexShaderCodeChanged(const QByteArray &vertexShaderCode)

Member Function Documentation

[static] QByteArray QShaderProgram::loadSource(const QUrl &sourceUrl)

Returns the shader code loaded from sourceUrl.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[override virtual protected] void QShaderProgram::sceneChangeEvent(const Qt3DCore::QSceneChangePtr &change)

Reimplements: QNode::sceneChangeEvent(const Qt3DCore::QSceneChangePtr &change).

Posts a scene change with parameter change.

void QShaderProgram::setShaderCode(Qt3DRender::QShaderProgram::ShaderType type, const QByteArray &shaderCode)

Sets the shader code for type of shader to the shaderCode.

See also shaderCode().

QByteArray QShaderProgram::shaderCode(Qt3DRender::QShaderProgram::ShaderType type) const

Returns the shader code for type.

See also setShaderCode().

Qt3DRender::QShaderProgram::Status QShaderProgram::status() const

Returns the status of the current shader program.

Note: Getter function for property status.

© The Qt Company Ltd
Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-5.15/qt3drender-qshaderprogram.html