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50 
51 //! [0]
52 QOpenGLShader shader(QOpenGLShader::Vertex);
53 shader.compileSourceCode(code);
54 
55 QOpenGLShaderProgram program(context);
56 program.addShader(&shader);
57 program.link();
58 
59 program.bind();
60 //! [0]
61 
62 //! [1]
63 program.addShaderFromSourceCode(QOpenGLShader::Vertex,
64     "attribute highp vec4 vertex;\n"
65     "uniform highp mat4 matrix;\n"
66     "void main(void)\n"
67     "{\n"
68     "   gl_Position = matrix * vertex;\n"
69     "}");
70 program.addShaderFromSourceCode(QOpenGLShader::Fragment,
71     "uniform mediump vec4 color;\n"
72     "void main(void)\n"
73     "{\n"
74     "   gl_FragColor = color;\n"
75     "}");
76 program.link();
77 program.bind();
78 
79 int vertexLocation = program.attributeLocation("vertex");
80 int matrixLocation = program.uniformLocation("matrix");
81 int colorLocation = program.uniformLocation("color");
82 //! [1]
83 
84 //! [2]
85 static GLfloat const triangleVertices[] = {
86     60.0f,  10.0f,  0.0f,
87     110.0f, 110.0f, 0.0f,
88     10.0f,  110.0f, 0.0f
89 };
90 
91 QColor color(0, 255, 0, 255);
92 
93 QMatrix4x4 pmvMatrix;
94 pmvMatrix.ortho(rect());
95 
96 program.enableAttributeArray(vertexLocation);
97 program.setAttributeArray(vertexLocation, triangleVertices, 3);
98 program.setUniformValue(matrixLocation, pmvMatrix);
99 program.setUniformValue(colorLocation, color);
100 
101 glDrawArrays(GL_TRIANGLES, 0, 3);
102 
103 program.disableAttributeArray(vertexLocation);
104 //! [2]
105