QML Shaders

[ustulation]

I recently found out that though Animations do a great job super-cool stuffs in QML are done using shaders. Now I know nothing about this. "One eg I found out is here":http://ilkka.github.io/blog/2011/03/04/qtquick_2_scenegraph_glsl_fragment_shader_tutorial/.

I would certainly like to add such effects to my project but I know nothing about shaders. However I've programmed in WPF3D - C# in the past on 3D modelling of real-world surfaces so I have some knowledge of mesh, geometry, texture etc. I want some advice on how do I start learning the usage of Shaders in QML. Do i need to study OpenGL 1st or some specific offerings of OpenGL or something called GLSL? Is there any other way i can have those effects (for eg the one in the link i posted)?

[Vincent007]

I suggest you try this simple "example":http://doc-snapshot.qt-project.org/qdoc/qml-qtquick-shadereffect.html first.

and then try other examples.

@
import QtQuick 2.0

Rectangle {
width: 200; height: 100
Row {
Image { id: img; sourceSize { width: 100; height: 100 } source: "qt-logo.png" }
ShaderEffect {
width: 100; height: 100
property variant src: img
vertexShader: "
uniform highp mat4 qt_Matrix;
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
varying highp vec2 coord;
void main() {
coord = qt_MultiTexCoord0;
gl_Position = qt_Matrix * qt_Vertex;
}"
fragmentShader: "
varying highp vec2 coord;
uniform sampler2D src;
uniform lowp float qt_Opacity;
void main() {
lowp vec4 tex = texture2D(src, coord);
gl_FragColor = vec4(vec3(dot(tex.rgb, vec3(0.344, 0.5, 0.156))), tex.a) * qt_Opacity;
}"
}
}
}
@