C4FoWDrawTriangulator Class Reference

#include <C4FoWDrawStrategy.h>

Public Member Functions
	C4FoWDrawTriangulator ()
void	Fan ()
void	Quads ()
void	AddVertex ()
void	Reset ()
const unsigned int *	GetIndices () const
unsigned int	GetNIndices () const

Detailed Description

This class decomposes Triangle fans and quads into individual triangles. This is used to so that all FoW elements can be drawn as triangles in a single glDrawElements call.

Definition at line 33 of file C4FoWDrawStrategy.h.

Constructor & Destructor Documentation

C4FoWDrawTriangulator()

C4FoWDrawTriangulator::C4FoWDrawTriangulator ( )

default

Member Function Documentation

AddVertex()

void C4FoWDrawTriangulator::AddVertex

(

)

Definition at line 61 of file C4FoWDrawStrategy.cpp.

{
    switch (mode)
    {
    case M_Fan:
        ++cur_vertices;
        if (cur_vertices == 3)
        {
            indices.push_back(begin_vertices);
            indices.push_back(begin_vertices + 1);
            indices.push_back(begin_vertices + 2);
        }
        else if (cur_vertices > 3)
        {
            indices.push_back(begin_vertices);
            indices.push_back(begin_vertices + cur_vertices - 2);
            indices.push_back(begin_vertices + cur_vertices - 1);
        }
        break;
    case M_Quads:
        ++cur_vertices;
        if (cur_vertices % 4 == 0)
        {
            // upper tri
            indices.push_back(begin_vertices + cur_vertices - 4);
            indices.push_back(begin_vertices + cur_vertices - 3);
            indices.push_back(begin_vertices + cur_vertices - 2);
 
            // lower tri
            indices.push_back(begin_vertices + cur_vertices - 4);
            indices.push_back(begin_vertices + cur_vertices - 2);
            indices.push_back(begin_vertices + cur_vertices - 1);
        }
        break;
    default:
        assert(false);
    }
}

Referenced by C4FoWDrawStrategy::DrawDarkVertex(), and C4FoWDrawStrategy::DrawLightVertex().

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Fan()

void C4FoWDrawTriangulator::Fan

(

)

Definition at line 28 of file C4FoWDrawStrategy.cpp.

{
    FinishPrimitive();
    mode = M_Fan;
}

Referenced by C4FoWDrawStrategy::BeginFan(), and C4FoWDrawStrategy::BeginIntermediateFade().

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GetIndices()

const unsigned int* C4FoWDrawTriangulator::GetIndices ( ) const

inline

Definition at line 44 of file C4FoWDrawStrategy.h.

{ return &indices[0]; }

Referenced by C4FoWDrawLightTextureStrategy::End(), and C4FoWDrawWireframeStrategy::End().

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GetNIndices()

unsigned int C4FoWDrawTriangulator::GetNIndices ( ) const

inline

Definition at line 45 of file C4FoWDrawStrategy.h.

{ return indices.size(); }

Referenced by C4FoWDrawLightTextureStrategy::End(), and C4FoWDrawWireframeStrategy::End().

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Quads()

void C4FoWDrawTriangulator::Quads

(

)

Definition at line 34 of file C4FoWDrawStrategy.cpp.

{
    FinishPrimitive();
    mode = M_Quads;
}

Referenced by C4FoWDrawStrategy::BeginFade(), and C4FoWDrawStrategy::BeginFanMaxed().

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Reset()

void C4FoWDrawTriangulator::Reset

(

)

Definition at line 100 of file C4FoWDrawStrategy.cpp.

{
    FinishPrimitive();
    begin_vertices = 0;
 
    // Assume this keeps capacity
    indices.resize(0);
}

Referenced by C4FoWDrawStrategy::End().

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The documentation for this class was generated from the following files:

• C4FoWDrawStrategy.h
• C4FoWDrawStrategy.cpp