Background.cpp

A very simplistic implementation of rendering a homogeneous background.

A very simplistic implementation of rendering a homogeneous background.

See also

QuadDemo.cpp for rendering geometries using OpenGL 1.

#include <ocean/plankton/VPipeline.hpp>
#include <ocean/GLvish/VGLRenderObject.hpp>
 
 
using namespace Wizt;
 
namespace
{
 
class   DefaultBackground : public VGLRenderObject
{
        // Defining input parameters of type double
        in<double>      Red, Green, Blue, Alpha;
 
        // The render callback function
        bool    renderGL(VGLRenderContext&Context) const override
        {
        double  red = 1, green = 1, blue = 1, alpha=1;
 
                Red   << Context >> red;
                Green << Context >> green;
                Blue  << Context >> blue;
                Alpha << Context >> alpha;
 
                glClearDepth(1.0);
                glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
                glClearColor( red, green,  blue, alpha );
                glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
                Context.number_of_depthbuffer_clearance_objects++;
 
                return true;
        }
 
public:
        DefaultBackground(const string&name, int, const RefPtr<VCreationPreferences>&VP)
        : VGLRenderObject(name, BACKGROUND_OBJECT, VP)
        // Each input parameter is initialized with its GUI name and default value
        , Red  (this, "red"  , 1.0)
        , Green(this, "green", 1.0)
        , Blue (this, "blue" , 1.0 )
        , Alpha(this, "alpha", 1.0 )
        {
                // Setting the parameters as local is optional,
                // in general this would not be the case, but for
                // the background it can make sense such that we
                // can have a different background color in each viewer
                Red  ->Localize();
                Green->Localize();
                Blue ->Localize();
                Alpha->Localize();
        }
};
 
using namespace Panthalassa;
 
static  VSink<DefaultBackground>
        myBackground( Category("Backgrounds") + VIdentifier("Background"), ObjectQuality::DEMO);
 
}