PySide6.Qt3DRender.Qt3DRender.QShaderProgram¶

class QShaderProgram¶

Encapsulates a Shader Program. More…

Synopsis¶

Note

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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];

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];

RHI Support¶

When writing GLSL 450 shader code to use with Qt 3D’s RHI backend, the default uniforms will be provided as 2 uniform buffer objects.

The binding locations for these is set to bindings 0 for RenderView uniforms and 1 for Command uniforms.

#version 450 core

layout(location = 0) in vec3 vertexPosition;

layout(std140, binding = 0) uniform qt3d_render_view_uniforms {
  mat4 viewMatrix;
  mat4 projectionMatrix;
  mat4 uncorrectedProjectionMatrix;
  mat4 clipCorrectionMatrix;
  mat4 viewProjectionMatrix;
  mat4 inverseViewMatrix;
  mat4 inverseProjectionMatrix;
  mat4 inverseViewProjectionMatrix;
  mat4 viewportMatrix;
  mat4 inverseViewportMatrix;
  vec4 textureTransformMatrix;
  vec3 eyePosition;
  float aspectRatio;
  float gamma;
  float exposure;
  float time;
  float yUpInNDC;
  float yUpInFBO;
};

layout(std140, binding = 1) uniform qt3d_command_uniforms {
  mat4 modelMatrix;
  mat4 inverseModelMatrix;
  mat4 modelViewMatrix;
  mat3 modelNormalMatrix;
  mat4 inverseModelViewMatrix;
  mat4 modelViewProjection;
  mat4 inverseModelViewProjectionMatrix;
};

void main()
{
    gl_Position = (projectionMatrix * viewMatrix * modelMatrix * vertexPosition);
}

For user defined uniform buffer object, use binding starting at 2 or auto to let Qt 3D work out the binding automatically. Make sure to remain consistent between the different shader stages.

#version 450 core

layout(std140, binding = auto) uniform my_uniforms {
  vec4 myColor;
};

layout(location=0) out vec4 fragColor;

void main()
{
    fragColor = myColor;
}

There is no change involved when it comes to feeding values to uniforms.

For the above example, setting myColor could be done with:

QParameter *parameter = new QParameter();
parameter->setName("myColor");
parameter->setValue(QVariant::fromValue(QColor(Qt::blue)));

Textures still have to be defined as standalone uniforms.

#version 450 core

layout(binding=0) uniform sampler2D source;

layout(location=0) out vec4 fragColor;

void main()
{
    fragColor = texture(source, vec2(0.5, 0.5));
}

class ShaderType¶

This enum identifies the type of shader used.

Constant

Description

Qt3DRender.QShaderProgram.Vertex

Vertex shader

Qt3DRender.QShaderProgram.Fragment

Fragment shader

Qt3DRender.QShaderProgram.TessellationControl

Tesselation control shader

Qt3DRender.QShaderProgram.TessellationEvaluation

Tesselation evaluation shader

Qt3DRender.QShaderProgram.Geometry

Geometry shader

Qt3DRender.QShaderProgram.Compute

Compute shader

Constant	Description
Qt3DRender.QShaderProgram.Vertex	Vertex shader
Qt3DRender.QShaderProgram.Fragment	Fragment shader
Qt3DRender.QShaderProgram.TessellationControl	Tesselation control shader
Qt3DRender.QShaderProgram.TessellationEvaluation	Tesselation evaluation shader
Qt3DRender.QShaderProgram.Geometry	Geometry shader
Qt3DRender.QShaderProgram.Compute	Compute shader

class Status¶

This enum identifies the status of shader used.

Constant

Description

Qt3DRender.QShaderProgram.NotReady

The shader hasn’t been compiled and linked yet

Qt3DRender.QShaderProgram.Ready

The shader was successfully compiled

Qt3DRender.QShaderProgram.Error

An error occurred while compiling the shader

Constant	Description
Qt3DRender.QShaderProgram.NotReady	The shader hasn’t been compiled and linked yet
Qt3DRender.QShaderProgram.Ready	The shader was successfully compiled
Qt3DRender.QShaderProgram.Error	An error occurred while compiling the shader

class Format¶

This enum identifies the format of the shader code used.

Constant

Description

Qt3DRender.QShaderProgram.GLSL

OpenGL

Qt3DRender.QShaderProgram.SPIRV

Vulkan, OpenGL 5

Constant	Description
Qt3DRender.QShaderProgram.GLSL	OpenGL
Qt3DRender.QShaderProgram.SPIRV	Vulkan, OpenGL 5

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property computeShaderCodeᅟ: QByteArray¶

Holds the compute shader code used by this shader program.

Access functions:

computeShaderCode()
setComputeShaderCode()
Signal computeShaderCodeChanged()

property formatᅟ: Qt3DRender.QShaderProgram.Format¶

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

Access functions:

format()
setFormat()
Signal formatChanged()

property fragmentShaderCodeᅟ: QByteArray¶

Holds the fragment shader code used by this shader program.

Access functions:

fragmentShaderCode()
setFragmentShaderCode()
Signal fragmentShaderCodeChanged()

property geometryShaderCodeᅟ: QByteArray¶

Holds the geometry shader code used by this shader program.

Access functions:

geometryShaderCode()
setGeometryShaderCode()
Signal geometryShaderCodeChanged()

property logᅟ: str¶

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

Access functions:

log()
Signal logChanged()

property statusᅟ: Qt3DRender.QShaderProgram.Status¶

Holds the status of the current shader program.

Access functions:

status()
Signal statusChanged()

property tessellationControlShaderCodeᅟ: QByteArray¶

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

Access functions:

tessellationControlShaderCode()
setTessellationControlShaderCode()
Signal tessellationControlShaderCodeChanged()

property tessellationEvaluationShaderCodeᅟ: QByteArray¶

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

Access functions:

tessellationEvaluationShaderCode()
setTessellationEvaluationShaderCode()
Signal tessellationEvaluationShaderCodeChanged()

property vertexShaderCodeᅟ: QByteArray¶

Holds the vertex shader code used by this shader program.

Access functions:

vertexShaderCode()
setVertexShaderCode()
Signal vertexShaderCodeChanged()

__init__([parent=None])¶

Parameters:: parent – QNode

computeShaderCode()¶

Return type:: QByteArray

See also

setComputeShaderCode()

Getter of property computeShaderCodeᅟ .

computeShaderCodeChanged(computeShaderCode)¶

Parameters:: computeShaderCode – QByteArray

Notification signal of property computeShaderCodeᅟ .

format()¶

Return type:: Format

See also

setFormat()

Getter of property formatᅟ .

formatChanged(format)¶

Parameters:: format – Format

Notification signal of property formatᅟ .

fragmentShaderCode()¶

Return type:: QByteArray

See also

setFragmentShaderCode()

Getter of property fragmentShaderCodeᅟ .

fragmentShaderCodeChanged(fragmentShaderCode)¶

Parameters:: fragmentShaderCode – QByteArray

Notification signal of property fragmentShaderCodeᅟ .

geometryShaderCode()¶

Return type:: QByteArray

See also

setGeometryShaderCode()

Getter of property geometryShaderCodeᅟ .

geometryShaderCodeChanged(geometryShaderCode)¶

Parameters:: geometryShaderCode – QByteArray

Notification signal of property geometryShaderCodeᅟ .

static loadSource(sourceUrl)¶

Parameters:: sourceUrl – QUrl
Return type:: QByteArray

Returns the shader code loaded from sourceUrl.

log()¶

Return type:: str

Getter of property logᅟ .

logChanged(log)¶

Parameters:: log – str

Notification signal of property logᅟ .

setComputeShaderCode(computeShaderCode)¶

Parameters:: computeShaderCode – QByteArray

See also

computeShaderCode()

Setter of property computeShaderCodeᅟ .

setFormat(format)¶

Parameters:: format – Format

See also

format()

Setter of property formatᅟ .

setFragmentShaderCode(fragmentShaderCode)¶

Parameters:: fragmentShaderCode – QByteArray

See also

fragmentShaderCode()

Setter of property fragmentShaderCodeᅟ .

setGeometryShaderCode(geometryShaderCode)¶

Parameters:: geometryShaderCode – QByteArray

See also

geometryShaderCode()

Setter of property geometryShaderCodeᅟ .

setShaderCode(type, shaderCode)¶

Parameters:

type – ShaderType
shaderCode – QByteArray

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

See also

shaderCode()

setTessellationControlShaderCode(tessellationControlShaderCode)¶

Parameters:: tessellationControlShaderCode – QByteArray

See also

tessellationControlShaderCode()

Setter of property tessellationControlShaderCodeᅟ .

setTessellationEvaluationShaderCode(tessellationEvaluationShaderCode)¶

Parameters:: tessellationEvaluationShaderCode – QByteArray

See also

tessellationEvaluationShaderCode()

Setter of property tessellationEvaluationShaderCodeᅟ .

setVertexShaderCode(vertexShaderCode)¶

Parameters:: vertexShaderCode – QByteArray

See also

vertexShaderCode()

Setter of property vertexShaderCodeᅟ .

shaderCode(type)¶

Parameters:: type – ShaderType
Return type:: QByteArray

Returns the shader code for type.

See also

setShaderCode()

status()¶

Return type:: Status

Returns the status of the current shader program.

Getter of property statusᅟ .

statusChanged(status)¶

Parameters:: status – Status

Notification signal of property statusᅟ .

tessellationControlShaderCode()¶

Return type:: QByteArray

See also

setTessellationControlShaderCode()

Getter of property tessellationControlShaderCodeᅟ .

tessellationControlShaderCodeChanged(tessellationControlShaderCode)¶

Parameters:: tessellationControlShaderCode – QByteArray

Notification signal of property tessellationControlShaderCodeᅟ .

tessellationEvaluationShaderCode()¶

Return type:: QByteArray

See also

setTessellationEvaluationShaderCode()

Getter of property tessellationEvaluationShaderCodeᅟ .

tessellationEvaluationShaderCodeChanged(tessellationEvaluationShaderCode)¶

Parameters:: tessellationEvaluationShaderCode – QByteArray

Notification signal of property tessellationEvaluationShaderCodeᅟ .

vertexShaderCode()¶

Return type:: QByteArray

See also

setVertexShaderCode()

Getter of property vertexShaderCodeᅟ .

vertexShaderCodeChanged(vertexShaderCode)¶

Parameters:: vertexShaderCode – QByteArray

Notification signal of property vertexShaderCodeᅟ .

PySide6.Qt3DRender.Qt3DRender.QShaderProgram¶

Synopsis¶

Properties¶

Methods¶

Slots¶

Signals¶

Static functions¶

Detailed Description¶

RHI Support¶