CrystalSurface.cpp

Spherical surface displayed via CrystalSurface module.

Display a triangular surface as transparent object with a pretty shader using conventional depth-sorting (NOT depth-peeling).

The most simple version of a surface rendered is demonstrated by MonochromeSurface .

 
#include <ocean/GLvish/VGLRenderObject.hpp>
#include <ocean/GLvish/BoundingBox.hpp>
#include <ocean/GLvish/ArrayTypes.hpp>
#include <ocean/GLvish/colors.hpp>
 
#include <ocean/shrimp/VObjectStatus.hpp>
 
#include <eagle/PhysicalSpace.hpp>
 
#include <field/Cell.hpp>
#include <GL/fiberGL.hpp>
 
#include <baseop/ExpandBBox.hpp>
#include <eye/retina/VSkeletonRenderObject.hpp>
#include <grid/types/TriangularSurface.hpp>
#include <bundle/BundleProperty.hpp>
#include <bone/GridActor.hpp>
 
#include <GL/PartialElementRenderer.hpp>
#include <GLvish/Programmable.hpp>
 
using namespace Wizt;
using namespace Fiber;
using namespace Eagle;
 
namespace
{
 
 
/*
  Render a triangular surface transparently.
 */
class   CrystalSurface : public VSkeletonRenderObject, public Programmable
{
public:
        using   glsl = RenderNamespace::glsl;
        using   GridInspector =  Fiber::GridInspector< hasSkeletonOfGridType<Fiber::TriangularSurface> >;
//      using   GridInspector = Fiber::GridInspector< BundleProperty::Anything >;
 
        glsl    vertex_shader(VRenderContext&Context) const override
        {
                return  embed_glsl( {
#embed "CrystalSurface.vert"
                                } );
        }
 
        glsl    fragment_shader(VRenderContext&Context) const override
        {
                return  embed_glsl( {
#embed "CrystalSurface.frag"
                                } );
        }
 
 
 
        struct MyState : State, TriangularSurface
        {
                using TriangularSurface::operator=;
        };
 
        RefPtr<State> newState() const override
        {
                return new MyState();
        }
 
        TypedSlot<rgba_float_t> SurfaceColor,
                                SurfaceBackColor;
 
        TypedSlot<double>       Transparency,
                                Alpha,
                                Colority;
 
        CrystalSurface(const string&name, int, const RefPtr<VCreationPreferences>&VP)
        : VGLRenderObject(name, TRANSPARENT_OBJECT, VP)
        , VSkeletonRenderObject(name, TRANSPARENT_OBJECT, VP)
        , SurfaceColor(this, "color", {1.,.1,1., 1.0},0)
        , SurfaceBackColor(this, "backcolor", {.0, 1.,1.0, 1.0},0)
        , Transparency(this, "transparency", 0.5, 0)
        , Alpha(this, "alpha", 1.0, 2)
        , Colority(this, "colorness", 0.5, 1)
        {}
 
        bool    renderGL(VGLRenderContext&Context) const override;
        bool    update(VRequest&R, double precision) override;
 
static string createChildname(const string&parent_name)
        {
                return "CrystalSurface(" + parent_name + ")";
        }
 
};
 
 
bool CrystalSurface::update(VRequest&Context, double precision)
{
RefPtr<MyState> S = myState(Context);
 
RefPtr<Grid>  G = findMostRecentGrid( Context );
        if (!G)
        {
                removeState(Context);
                return setStatusError(Context, "No Grid found.");
        }
 
        *S = G;
 
        if (!*S)
                return setStatusError(Context, "No surface available.");
 
        setBoundingBall(Context, getBoundingBox( S->CoordField ) );
 
        return setStatusInfo(Context, "Surface ready to render.");
}
 
struct  TriangleRenderer : GL::PartialElementRenderer
{
        RefPtr<TriangularSurface::CellArray_t>  Cells;
 
        TriangleRenderer(const MemCore::RefPtr<Fiber::MemBase>&FieldCoordinates,
                         const RefPtr<TriangularSurface::CellArray_t>&TriangleCells)
        : GL::PartialElementRenderer( FieldCoordinates, NullPtr() )
        , Cells(TriangleCells)
        {
                assert( TriangleCells );
                assert( Cells->getTypedStorage() );
 
        const std::vector<TriangleCell>&Cls = Cells->getTypedStorage()->get_vector();
                this->CurrentIBO = new IndexBuffer<TriangleCell>( Cls );
                draw_mode = GL_TRIANGLES;
        }
 
        void prefix() override
        {
                glEnable(GL_DEPTH_TEST); // see depth buffer
                glDepthMask(GL_FALSE);   // but don't write to it
                glEnable(GL_NORMALIZE);
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                glEnable( GL_BLEND );
        }
 
        void    postfix() override
        {
                glDepthMask(GL_TRUE);
        }
};
 
bool    CrystalSurface::renderGL(VGLRenderContext&Context) const
{
RefPtr<MyState> myState = getState(Context);
        if (!myState)
                return false;
 
TriangularSurface&Surface = *myState;
        if (!Surface)
                return false;
 
        if (!Surface.CoordField)
        {
                printf("Did not find coordinates :( \n");
                return false;
        }
 
        if (!Surface.CellField)
        {
                printf("Did not find triangles :( \n");
                return false;
        }
 
//
// Generic OpenGL section, these settings affect all VBO's rendered later
//
        glEnable(GL_LIGHTING);
 
        glMaterialf( GL_FRONT, GL_SHININESS,  3 );
        glMaterialf( GL_BACK , GL_SHININESS, 50 );
 
        glMaterial( GL::FRONT_AND_BACK, GL::AMBIENT , Color{0,0,.01,0} );
        glMaterial( GL::FRONT_AND_BACK, GL::SPECULAR, Color{0.5,0.5,.53, 0} );
        glMaterial( GL::FRONT_AND_BACK, GL::EMISSION, Color{0., 0.,0., 0} );
        glColor4f(1,0,0, 0.5);
 
        glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
//      glColorMaterial( GL_FRONT_AND_BACK, GL_DIFFUSE);
//      glEnable( GL_COLOR_MATERIAL );
 
rgba_float_t    SurfColor {1,0,0,0.5 };
        SurfaceColor << Context >> SurfColor;
 
rgba_float_t    SurfBackColor{ 1,0,0,0.5};
        SurfaceBackColor << Context >> SurfBackColor;
 
        {
        double  Alpha = 0.5;
                SurfColor[3] = Alpha;
                SurfBackColor[3] = Alpha;
        }
 
//      glEnable( GL_DEPTH_TEST );
        //       glEnable( GL_MULTISAMPLE_ARB );
        // glEnable( GL_SAMPLE_ALPHA_TO_COVERAGE_ARB );
 
        glMaterial( GL::FRONT, GL::DIFFUSE, SurfColor );
        glMaterial( GL::BACK , GL::DIFFUSE, SurfBackColor );
 
//      glColor4f( 1,0,0,.8);
//      glMaterial( GL::FRONT, GL::DIFFUSE, makeColor( 1., 0.,0., 0.3) );
//      glMaterial( GL::BACK , GL::DIFFUSE, makeColor( .3, 1.,0., 0.3) );
 
 
//      printf(">>>>>   CrystalSurface: RENDER cells for t=%ld, %lu Triangles\n",
//             myState->CellField->time_value(), Cells->nElements() );
 
RefPtr<Field> Tmp = Surface.getTriangleBaryCenters();
RefPtr<CreativeArrayBase> BaryCenters = Tmp->getCreator();
 
 
        glEnable( GL_VERTEX_PROGRAM_TWO_SIDE );
 
RefPtr<GLProgram> MyProgram = CompileShader( Context, "CrystalSurface" );
        MyProgram->use();
 
        Transparency << Context > MyProgram;
        Alpha        << Context > MyProgram;
        Colority     << Context > MyProgram;
 
//
// VBO Access via GLCache, retrieve and re-use or generate new VBO
//
const string VBOKey = "";
RefPtr<ValueSet> V;// = ScaleFactor(Context);
 
RefPtr<VBO> myVBO;
RefPtr<TriangleRenderer> MyTriangleRenderer;
 
unsigned ViewCacheSize = 1;
 
        try
        {
                myVBO = Context( *Surface )( typeid(*this) )( V )(VERTEXBUFFER(), VBOKey);
 
                // Call the VBO if it's there and all ready to go.
                if (myVBO
                    && !myVBO->isOlderThan( *Surface.CellField)
                    && !myVBO->isOlderThan( *Surface.CoordField) )
                {
                        if (RefPtr<TriangleRenderer> TR = myVBO->getRenderer() )
                        {
                                assert( TR->MyElementSorter );
 
                                TR->CurrentIBO = TR->sortByDepth(Context, BaryCenters, ViewCacheSize );
 
                                if (myVBO->call() )
                                {
                                        return true;
                                }
                        }
                }
        }
        catch(const GLCacheError&Err)
        {}
        if (!myVBO)
                myVBO = Context[*Surface][ typeid(*this) ][ V ]( VERTEXBUFFER(), VBOKey);
 
        assert( myVBO );
        myVBO->clear();
 
//
// Loading fields as vertex arrays and append them to the VBO.
//
using namespace Eagle::PhysicalSpace;
 
        myVBO->append( new TypedVertexArray<point3>( myState->getCoords()->myChunk() ) );
 
        if (RefPtr<TriangularSurface::NormalVectorArray_t> VertexNormals = Surface.getNormals() )
        {
                myVBO->append( new TypedNormalArray<bivector3>( VertexNormals->myChunk() ));
        }
 
RefPtr<TriangleRenderer> TR = new TriangleRenderer(myState->getCoords(), myState->CellField->getData() );
        TR->MyElementSorter = new GL::TypedElementSorter<TriangleCell>(myState->CellField->getCreator() );
        TR->CurrentIBO = TR->sortByDepth(Context, BaryCenters, ViewCacheSize );
 
        myVBO->setRenderer( TR );
 
        myVBO->call();
 
        return true;
}
 
 
} // anon namespace
 
namespace
{
using namespace Panthalassa;
 
static VSink< Grid, CrystalSurface >
MyCreator(      Category( "Display" ) + VIdentifier( "CrystalSurface" ) + Application( "General" ) +
                Description( "Show trianglular surface transparently, emphasizing the outline regions." ) +
                Help( "todo" ) +
                Url( "http://vish.fiberbundle.net/wiki" ),
                ObjectQuality::OUTDATED );
}