Parameter QML Type

Provides storage for a name and value pair. This maps to a shader uniform. More...

• List of all members, including inherited members

Properties

• name : QString
• value : QVariant

Detailed Description

A Parameter can be referenced by a RenderPass, Technique, Effect, Material, TechniqueFilter, RenderPassFilter. At runtime, depending on which shader is selected for a given step of the rendering, the value contained in a Parameter will be converted and uploaded if the shader contains a uniform with a name matching that of the Parameter.

 Parameter {
     name: "diffuseColor"
     value: "blue"
 }

 // Works with the following GLSL uniform shader declarations
 // uniform vec4 diffuseColor;
 // uniform vec3 diffuseColor;
 // uniform vec2 diffuseColor;
 // uniform float diffuseColor;

 Parameter {
     name: "diffuseValues[0]"
     value: [0.0, 1.0. 2.0, 3.0, 4.0, 883.0, 1340.0, 1584.0]
 }

 // Matching GLSL shader uniform  declaration
 // uniform float diffuseValues[8];

When it comes to texture support, the Parameter value should be set to the appropriate texture subclass that matches the sampler type of the shader uniform.

 Parameter {
     name: "diffuseTexture"
     value: Texture2D { ... }
 }

 // Works with the following GLSL uniform shader declaration
 // uniform sampler2D diffuseTexture

See also Qt3DRender::QAbstractTexture.

Property Documentation