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| |
| //! [0] |
| static char const colorizeShaderCode[] = |
| "uniform lowp vec4 effectColor;\n" |
| "lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) {\n" |
| " vec4 src = texture2D(imageTexture, textureCoords);\n" |
| " float gray = dot(src.rgb, vec3(0.212671, 0.715160, 0.072169));\n" |
| " vec4 colorize = 1.0-((1.0-gray)*(1.0-effectColor));\n" |
| " return vec4(colorize.rgb, src.a);\n" |
| "}"; |
| //! [0] |
| |
| //! [1] |
| class ColorizeEffect : public QGraphicsShaderEffect |
| { |
| Q_OBJECT |
| public: |
| ColorizeEffect(QObject *parent = 0) |
| : QGraphicsShaderEffect(parent), color(Qt::black) |
| { |
| setPixelShaderFragment(colorizeShaderCode); |
| } |
| |
| QColor effectColor() const { return color; } |
| void setEffectColor(const QColor& c) |
| { |
| color = c; |
| setUniformsDirty(); |
| } |
| |
| protected: |
| void setUniforms(QGLShaderProgram *program) |
| { |
| program->setUniformValue("effectColor", color); |
| } |
| |
| private: |
| QColor color; |
| }; |
| //! [1] |
| |
| //! [2] |
| lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) { |
| return texture2D(imageTexture, textureCoords); |
| } |
| //! [2] |