着色器在Android中不起作用-QT / QML应用程序

Question

编辑：我是QT / QML和Android应用程序开发的初学者。

着色器在Android中不起作用-QT / QML应用程序

我已经使用QT / QML开发了一个应用程序，并将该应用程序移植到Andriod中。

我在应用程序中使用了着色器。

虽然在Android着色器中部署无法正常工作。

QOpenGLShader::compile(Fragment): ERROR: 0:11: ':' :  wrong operand types  no operation ':' exists that takes a left-hand operand of type 'float' and a right operand of type 'const int' (or there is no acceptable conversion)

varying highp vec2 qt_TexCoord0;  // The coords within the source item                 uniform sampler2D source;         // The source item texture

编辑

ShaderEffect {
            anchors.fill: wrapper
            id:shader
            // Any property you add to the ShaderEffectItem is accessible as a
            // "uniform" value in the shader program. See GLSL doc for details.
            // Essentially, this is a value you pass to the fragment shader,
            // which is the same for every pixel, thus its name.

            // Here we add a source item (the scene) as a uniform value. Within the
            // shader, we can access it as a sampler2D which is the type used to
            // access pixels in a texture. So the source item becomes a texture.
            property variant source: ShaderEffectSource
            {
            sourceItem: scene // The item you want to apply the effect to
            hideSource: true  // Only show the modified item, not the original
        }
        property real dividerValue: 0.9
        // This is the fragment shader code in GLSL (GL Shading Language)
        fragmentShader: "
        varying highp vec2 qt_TexCoord0;  // The coords within the source item
        uniform sampler2D source;         // The source item texture
        uniform float dividerValue;
        void main(void)
        {
            // Read the source color of the pixel
            vec4 sourceColor = texture2D(source, qt_TexCoord0);

            // The alpha value of the mask
            float alpha = (qt_TexCoord0.x>dividerValue)?1.0:((qt_TexCoord0.x>(dividerValue-.1))?((qt_TexCoord0.x-(dividerValue-0.1))/0.1):0); // = 0.0 at left, 1.0 at right border
               // float alpha = (qt_TexCoord0.x>dividerValue)?1.0:qt_TexCoord0.x/dividerValue;
            // Multiply the alpha mask on the color to be drawn:
            sourceColor *= alpha;

            // Write the pixel to the output image
            gl_FragColor = sourceColor;
        }
        "

Answer 1

 float alpha = (qt_TexCoord0.x > dividerValue)
                  ? 1.0 
                  : ((qt_TexCoord0.x > (dividerValue-.1))
                      ? ((qt_TexCoord0.x-(dividerValue-0.1)) / 0.1)
                      : 0);

错误在这里是很清楚的：这里没有运算符:会在左边带float ，在右边带int ，这恰好是最后一个条件的情况，其中:运算符（ ((qt_TexCoord0.x-(dividerValue-0.1)) / 0.1)) ）是float ，但右边（ 0 ）是一个int 。 只需将0更改为0.0 （或.0 ）即可，它是float ，应该可以使用。

我猜想Android设备上的着色器编译器对于隐式转换会更加挑剔。