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** this package.

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****************************************************************************/

//! [0]

QGLShader shader(QGLShader::Vertex);

shader.compileSourceCode(code);

QGLShaderProgram program(context);

program.addShader(shader);

program.link();

program.bind();

//! [0]

//! [1]

program.addShaderFromSourceCode(QGLShader::Vertex,

    "attribute highp vec4 vertex;\n"

    "attribute mediump mat4 matrix;\n"

    "void main(void)\n"

    "{\n"

    "   gl_Position = matrix * vertex;\n"

    "}");

program.addShaderFromSourceCode(QGLShader::Fragment,

    "uniform mediump vec4 color;\n"

    "void main(void)\n"

    "{\n"

    "   gl_FragColor = color;\n"

    "}");

program.link();

program.bind();

int vertexLocation = program.attributeLocation("vertex");

int matrixLocation = program.attributeLocation("matrix");

int colorLocation = program.uniformLocation("color");

//! [1]

//! [2]

static GLfloat const triangleVertices[] = {

    60.0f,  10.0f,  0.0f,

    110.0f, 110.0f, 0.0f,

    10.0f,  110.0f, 0.0f

};

QColor color(0, 255, 0, 255);

QMatrix4x4 pmvMatrix;

pmvMatrix.ortho(rect());

program.enableAttributeArray(vertexLocation);

program.setAttributeArray(vertexLocation, triangleVertices, 3);

program.setUniformValue(matrixLocation, pmvMatrix);

program.setUniformValue(colorLocation, color);

glDrawArrays(GL_TRIANGLES, 0, 3);

program.disableAttributeArray(vertexLocation);

//! [2]