void OpenGLInitialization( void )
{
// We're drawing on a white background
glClearColor(1.0, 1.0, 1.0, 1.0);
// Convert our xyz curves into vertex arrays
for (uint i=0; i<curves.Size(); i++)
drawableCurves.Add( CurveToVertexArray( curves[i] ) );
// Covert our xyz curves into difference arrays. TODO: This is hard coded (our difference is
// computed from either curve #0 or curve #6)
for (uint i=0; i<curves.Size(); i++)
errorCurves.Add( DifferenceToVertexArray( curves[i], curves[ i<6?0:6 ] ) );
// Load the shaders to draw our curves; set some parameters
draw = new IGLUShaderProgram( "shaders/drawXYZCurve.vert.glsl",
"shaders/drawXYZCurve.geom.glsl",
"shaders/drawXYZCurve.frag.glsl" );
draw["xRange"] = vec2( 330.0f, 843.0f );
draw["yRange"] = vec2( -0.13f, 2.05f );
// Load the shader to draw our axes
drawAxes = new IGLUShaderProgram( "shaders/drawAxes.vert.glsl",
"shaders/drawAxes.frag.glsl" );
// Create the geometry for our axes
axes = new IGLUVertexArray();
float axesData[] = { -0.90f, -0.88f, 0.95f, -0.88f, // x-axis line
-0.88f, -0.88f, -0.88f, 0.95f, // y-axis line
-0.90f, -0.6513f, -0.88f, -0.6513f, // 0.25 tick
-0.90f, -0.4225f, -0.88f, -0.4225f, // 0.5 tick
-0.90f, -0.1938f, -0.88f, -0.1938f, // 0.75 tick
-0.90f, 0.035f, -0.88f, 0.035f, // 1.0 tick
-0.90f, 0.2638f, -0.88f, 0.2638f, // 1.25 tick
-0.90f, 0.4925f, -0.88f, 0.4925f, // 1.5 tick
-0.90f, 0.7213f, -0.88f, 0.7213f, // 1.75 tick
-0.90f, 0.95f, -0.88f, 0.95f, // 2.0 tick
-0.7243f, -0.88f, -0.7243f, -0.91f, // 400 nm tick
-0.5296f, -0.88f, -0.5296f, -0.91f, // 450 nm tick
-0.3349f, -0.88f, -0.3349f, -0.91f, // 500 nm tick
-0.1402f, -0.88f, -0.1402f, -0.91f, // 550 nm tick
0.0545f, -0.88f, 0.0545f, -0.91f, // 600 nm tick
0.24915f, -0.88f, 0.24915f, -0.91f, // 650 nm tick
0.4438f, -0.88f, 0.4438f, -0.91f, // 700 nm tick
0.6385f, -0.88f, 0.6385f, -0.91f, // 750 nm tick
0.8332f, -0.88f, 0.8332f, -0.91f, // 800 nm tick
};
axes->SetVertexArray( sizeof( axesData ), axesData );
axes->EnableAttribute( IGLU_ATTRIB_VERTEX, 2, GL_FLOAT );
}
IGLUVertexArray *iglu::IGLUGeometry::CreateQuad( uint type, uint matlid )
{
float *vptr = xyplane;
if ( type & IGLU_GEOM_XZ_PLANE ) vptr = xzplane;
if ( type & IGLU_GEOM_YZ_PLANE ) vptr = yzplane;
IGLUVertexArray::Ptr tmp = new IGLUVertexArray();
tmp->SetVertexArray( sizeof( xyplane ), vptr, IGLU_STATIC|IGLU_DRAW );
tmp->EnableAttribute( IGLU_ATTRIB_VERTEX, 3, GL_FLOAT, 9 * sizeof(float), BUFFER_OFFSET(6*sizeof(float)) );
if (type & IGLU_GEOM_USE_NORMAL)
tmp->EnableAttribute( IGLU_ATTRIB_NORMAL, 3, GL_FLOAT, 9 * sizeof(float), BUFFER_OFFSET(3*sizeof(float)) );
if (type & IGLU_GEOM_USE_TEXCOORD)
tmp->EnableAttribute( IGLU_ATTRIB_TEXCOORD, 2, GL_FLOAT, 9 * sizeof(float), BUFFER_OFFSET(1*sizeof(float)) );
return tmp;
}
// Do a pointwise difference between two XYZ curves and store into a renderable vertex array
IGLUVertexArray::Ptr DifferenceToVertexArray( XYZAbstract *approx, XYZAbstract *curve )
{
IGLUVertexArray::Ptr vArr = new IGLUVertexArray();
float *arrData = (float *)malloc( sizeof(float) * 4 * 471 );
float *fptr = arrData;
for (int i=360; i<=830; i++)
{
*(fptr++) = float(i);
*(fptr++) = approx->X(float(i))-curve->X(float(i));
*(fptr++) = approx->Y(float(i))-curve->Y(float(i));
*(fptr++) = approx->Z(float(i))-curve->Z(float(i));
}
vArr->SetVertexArray( sizeof(float) * 4 * 471, arrData );
vArr->EnableAttribute( IGLU_ATTRIB_VERTEX, 4, GL_FLOAT );
free( arrData );
return vArr;
}