/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the documentation of the Qt Toolkit.
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** No Commercial Usage
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** Foundation and appearing in the file LICENSE.LGPL included in the
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****************************************************************************/

//! [0]
QGLShader shader(QGLShader::VertexShader);
shader.compile(code);

QGLShaderProgram program(context);
program.addShader(shader);
program.link();

program.enable();
//! [0]

//! [1]
program.addShader(QGLShader::VertexShader,
    "attribute highp vec4 vertex;\n"
    "attribute mediump mat4 matrix;\n"
    "void main(void)\n"
    "{\n"
    "   gl_Position = matrix * vertex;\n"
    "}");
program.addShader(QGLShader::FragmentShader,
    "uniform mediump vec4 color;\n"
    "void main(void)\n"
    "{\n"
    "   gl_FragColor = color;\n"
    "}");
program.link();
program.enable();

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.setAttributeArray(vertexLocation, triangleVertices, 3);
program.setUniformValue(matrixLocation, pmvMatrix);
program.setUniformValue(colorLocation, color);

glDrawArrays(GL_TRIANGLES, 0, 3);
//! [2]