/*! \brief Sets up the vertex buffer objects for the axis.
*/
inline void init()
{
///////////////////Vertex Data
// three arrows, consisting of 3 lines each (6 vertices
std::vector<GLfloat> vertexdata(18 * 3);
float arrowHeadDepth = 0.25f;
float arrowHeadWidth = 0.15f;
for (size_t arrow(0); arrow < 3; ++arrow)
{
//Ordinate ->
for (size_t i(0); i < 3; ++i)
vertexdata[(6 * arrow + 0) * 3 + i] = -0.5f;
//-> Head
for (size_t i(0); i < 3; ++i)
vertexdata[(6 * arrow + 1) * 3 + i] = -0.5f;
vertexdata[(6 * arrow + 1) * 3 + arrow] = 0.5f;
//Head ->
for (size_t i(0); i < 3; ++i)
vertexdata[(6 * arrow + 2) * 3 + i] = -0.5f;
vertexdata[(6 * arrow + 2) * 3 + arrow] = 0.5f;
//-> Left point
vertexdata[(6 * arrow + 3) * 3 + arrow] = 0.5f - arrowHeadDepth;
vertexdata[(6 * arrow + 3) * 3 + ((arrow + 1) % 3)] = -0.5f + arrowHeadWidth;
vertexdata[(6 * arrow + 3) * 3 + ((arrow + 2) % 3)] = -0.5f;
//Head ->
for (size_t i(0); i < 3; ++i)
vertexdata[(6 * arrow + 4) * 3 + i] = -0.5f;
vertexdata[(6 * arrow + 4) * 3 + arrow] = 0.5f;
//-> Right point
vertexdata[(6 * arrow + 5) * 3 + arrow] = 0.5f - arrowHeadDepth;
vertexdata[(6 * arrow + 5) * 3 + ((arrow + 1) % 3)] = -0.5f - arrowHeadWidth;
vertexdata[(6 * arrow + 5) * 3 + ((arrow + 2) % 3)] = -0.5f;
}
_vertexData.init(vertexdata);
///////////////////Color Data
std::vector<GLubyte> colordata(18 * 4);
//First arrow is red, second green and last blue
for (size_t arrow(0); arrow < 3; ++arrow)
for (size_t vertex(0); vertex < 6; ++vertex)
{
colordata[(arrow * 6 + vertex)* 4 + arrow] = 255;
colordata[(arrow * 6 + vertex)* 4 + ((arrow + 1) % 3)] = 0;
colordata[(arrow * 6 + vertex)* 4 + ((arrow + 2) % 3)] = 0;
colordata[(arrow * 6 + vertex)* 4 + 3] = 255; //Alpha channel
}
_colorData.init(colordata);
}
/*! \brief Sets up the vertex buffer objects for the quad.
*/
inline void init()
{
///////////////////Vertex Data
// Single quad, in pre-transformed screen coordinates
std::vector<GLfloat> vertexdata(2 * 6);
vertexdata[2 * 0 + 0] = -1; vertexdata[2 * 0 + 1] = -1;
vertexdata[2 * 1 + 0] = 1; vertexdata[2 * 1 + 1] = -1;
vertexdata[2 * 2 + 0] = 1; vertexdata[2 * 2 + 1] = 1;
vertexdata[2 * 3 + 0] = 1; vertexdata[2 * 3 + 1] = 1;
vertexdata[2 * 5 + 0] = -1; vertexdata[2 * 5 + 1] = 1;
vertexdata[2 * 4 + 0] = -1; vertexdata[2 * 4 + 1] = -1;
_vertexData.init(vertexdata);
}
