Background.cpp

A very simplistic implementation of a homogeneous background.

#include <ocean/plankton/VCreator.hpp>
#include <ocean/GLvish/VRenderObject.hpp>
#include <ocean/plankton/VTime.hpp>


using namespace Wizt;


class   DefaultBackground : public VRenderObject
{
        override void render(VRenderContext&Context) const
        {
        GLclampf red=1, green=1, blue=1, alpha=1; 
        int r=100, g=100, b=100; 
                getParameterValue(r, "red", Context);
                red = r/100.; 
                getParameterValue(g, "green", Context); 
                green = g/100.; 
//puts("$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$");
                if (!getParameterValue(b, "blue", Context) )
                        puts("COULD NOT GET BLUE!");
#if 0
printf("Background: BLUE is %d\n", b); 

VParameterReference*VPR = getParameterReference("blue"); 
        if (!VPR) puts("NO blue parameter"); 
        else VPR->p.speak( VPR->member.c_str() ); 

                printf("Parameter has type %s\n",
                       Typename( VPR->p->getType( VPR->member ) ).c_str() 
                        ); 
                fflush(stdout);
#endif


                blue  = b/100.; 

                glClearColor( red,
                              green,
                              blue,
                              alpha );

                glClear(GL_COLOR_BUFFER_BIT); 
        }

public:
        const std::type_info&getType() const 
        {
                return typeid( DefaultBackground );
        }

        DefaultBackground(const string&name, int p, const RefPtr<VCreationPreferences>&VP)
        : VRenderObject(name, BACKGROUND_OBJECT+p, VP)
        {
                addParam("blue" , 53, new VCreationPreferences("local") );
                addParam("green", 65, new VCreationPreferences("local") );
                addParam("red"  , 65, new VCreationPreferences("local") );
        }
};


/*
 An OpenGL background which uses a background color depending
 on a time parameter.
 */
class   DynamicBackground : public VRenderObject
{
        override void render(VRenderContext&Context) const
        {
        VTime   t;
                getParameterValue(t, "time", Context);

        GLclampf red=1, green=1, blue=1, alpha=1;

        int r=100, g=100, b=100; 
                getParameterValue(r, "red", Context);
                red = r/100. - t(); 
                getParameterValue(g, "green", Context); 
                green = g/100. + t(); 
                getParameterValue(b, "blue", Context); 
                blue  = b/100.;

                glClearColor( red,
                              green,
                              blue,
                              alpha );

                glClear(GL_COLOR_BUFFER_BIT); 
        }

public:
        const std::type_info&getType() const 
        {
                return typeid( DynamicBackground  );
        }

        DynamicBackground (const string&name, int p, const RefPtr<VCreationPreferences>&VP)
        : VRenderObject(name, BACKGROUND_OBJECT+p, VP)
        {
                addParam("time", VTime(0) );//->LocalizeVariable();

                addParam("blue" , 53, new VCreationPreferences("local") );
                addParam("green", 65, new VCreationPreferences("local") );
                addParam("red"  , 65, new VCreationPreferences("local") );
        }
};


static VCreator<DefaultBackground> myBackground("Background");

static VCreator<DynamicBackground> myDynamicBackground("DynamicBackground");

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