QML中使用GLSL编程

charles_gz

图片是在人家的GLSL代码基础上做的修改，要达到的是红色区域直接投射到窗口背景上。下面是GLSL代码：
    fragmentShader: "    varying highp vec2 qt_TexCoord0;    uniform highp float qt_Opacity;    uniform highp float _lightPosX;    uniform highp float _lightPosY;    uniform highp float diffuseBoost;    uniform highp float lightIntensity;    uniform highp float colorizeAmount;    uniform highp vec4 colorizeColor;    uniform bool switchX;    uniform bool switchY;
    void main(void)    {        highp vec2 pixPos = qt_TexCoord0;        highp vec3 normal = normalize(vec3(0.0,0.0,1.0));        highp float xp = float(switchX) * (_lightPosX - pixPos.x) + float(!switchX) * (pixPos.x - _lightPosX);        highp float yp = float(switchY) * (_lightPosY - pixPos.y) + float(!switchY) * (pixPos.y - _lightPosY);        highp vec3 light_pos = normalize(vec3(xp, yp, lightIntensity));
        highp float diffuse = max(dot(normal, light_pos), 0.2);        diffuse *= (1.0 + diffuseBoost);
        highp vec4 color = vec4(diffuse * vec3(1.0,1.0,1.0), 0.0);
        gl_FragColor = color * qt_Opacity;    }    "
希望大神给予指点。谢谢

charles_gz

咋没人回答呢？是没有人这么做过吗？