QML 3D / Shaders : issue with second texture

billouparis

Hello all,
I'm trying one example provided here with some modifications:
http://doc.qt.nokia.com/qt3d-snapshot/tutorials-shaders-shader-tutorial-1-textures-qml.html
@ShaderProgram {
id: program
texture: "../../resources/map512x512.png"
property string texture2: "../../resources/ButtonHMI.png"
property real interpolationFactor : 0.5

    vertexShader: "
        attribute highp vec4 qt_Vertex;
        uniform highp mat4 qt_ModelViewProjectionMatrix;

        attribute highp vec4 qt_MultiTexCoord0;
        varying highp vec4 texCoord;

        void main(void)
        {
            texCoord.st = qt_MultiTexCoord0.xy;
            gl_Position = qt_ModelViewProjectionMatrix * qt_Vertex;
        }
        "
    fragmentShader: "
        varying highp vec4 texCoord;
        uniform sampler2D qt_Texture0;
        uniform sampler2D texture2;
        uniform mediump float interpolationFactor;

        void main(void)
        {
            mediump vec4 texture1Color = texture2D(qt_Texture0, texCoord.st);
            mediump vec4 texture2Color = texture2D(texture2, texCoord.st);
            mediump vec4 textureColor = mix(texture1Color, texture2Color,
                                        interpolationFactor);
            gl_FragColor = texture2Color;
        }
        "
}@

I understand the property "texture" mapped to qt_Texture0, but texture2 is not working at all.
The result is a dark version of texture1Color. just like it was a mix between qt_Texture0 and a black texture corresponding to color (0,0,0,0).

So I tried to simply do the following: gl_FragColor = texture1Color;

@ fragmentShader: "
varying highp vec4 texCoord;
uniform sampler2D qt_Texture0;
uniform sampler2D texture2;
uniform mediump float interpolationFactor;

     void main(void)
     {
         mediump vec4 texture1Color = texture2D(qt_Texture0, texCoord.st);
         mediump vec4 texture2Color = texture2D(texture2, texCoord.pq);
         mediump vec4 textureColor = mix(texture1Color, texture2Color, interpolationFactor);
         gl_FragColor = texture1Color;
     }
     "
 }@

and the texture1 is displayed correctly.

Then, I itried to simply display texture2Colod by doing the following: gl_FragColor = texture2Color;
@ fragmentShader: "
varying highp vec4 texCoord;
uniform sampler2D qt_Texture0;
uniform sampler2D texture2;
uniform mediump float interpolationFactor;

     void main(void)
     {
         mediump vec4 texture1Color = texture2D(qt_Texture0, texCoord.st);
         mediump vec4 texture2Color = texture2D(texture2, texCoord.pq);
         mediump vec4 textureColor = mix(texture1Color, texture2Color, interpolationFactor);
         gl_FragColor = *texture2Color *;
     }
     "
 }@

And the result is a black image, instead of getting the corresponding texture2 texture :(
Anyone can help me on this?

Thank you,
Bill

billouparis

Problem is occuring only if I mix 2D element and 3D element. The point is being followed on the qt-3D mailing list. If I get an answer / bug fix, I will advise this here.