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/*
* Stellarium
* Copyright (C) 2009 Fabien Chereau
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*/
#ifndef __STELVERTEXARRAY_HPP__
#define __STELVERTEXARRAY_HPP__
#include "VecMath.hpp"
#include <QVector>
#include <QDebug>
struct StelVertexArray
{
// TODO maybe merge this with StelPainter DrawingMode
enum StelPrimitiveType
{
Points = 0x0000, // GL_POINTS
Lines = 0x0001, // GL_LINES
LineLoop = 0x0002, // GL_LINE_LOOP
LineStrip = 0x0003, // GL_LINE_STRIP
Triangles = 0x0004, // GL_TRIANGLES
TriangleStrip = 0x0005, // GL_TRIANGLE_STRIP
TriangleFan = 0x0006 // GL_TRIANGLE_FAN
};
StelVertexArray(StelPrimitiveType pType=StelVertexArray::Triangles) : primitiveType(pType) {;}
StelVertexArray(const QVector<Vec3d>& v, StelPrimitiveType pType=StelVertexArray::Triangles,const QVector<Vec2f>& t=QVector<Vec2f>(), const QVector<unsigned short> i=QVector<unsigned short>()) :
vertex(v), texCoords(t), indices(i), primitiveType(pType) {;}
//! OpenGL compatible array of 3D vertex to be displayed using vertex arrays.
//! TODO, move to float? Most of the vectors are normalized, thus the precision is around 1E-45 using float
//! which is enough (=2E-37 milli arcsec).
QVector<Vec3d> vertex;
//! OpenGL compatible array of edge flags to be displayed using vertex arrays.
QVector<Vec2f> texCoords;
//! OpenGL compatible array of vertex colors to be displayed using arrays. (GZ/NEW)
//! The color (if exists) shall be multiplied with texture to modulate e.g. for extinction of Milky Way or other large items.
QVector<Vec3f> colors;
//! OpenGL compatible array of indices for the vertex and the textures
QVector<unsigned short> indices;
StelPrimitiveType primitiveType;
bool isIndexed() const {return !indices.isEmpty();}
bool isTextured() const {return !texCoords.isEmpty();}
bool isColored() const {return !colors.isEmpty();}
//! call a function for each triangle of the array.
//! func should define the following method : // GZ NEW: colors
//! void operator() (const Vec3d* vertex[3], const Vec2f* tex[3], const Vec3f* colors[3], unsigned int indices[3])
//! The method takes arrays of *pointers* as arguments because we can't assume the values are contiguous
template<class Func>
inline Func foreachTriangle(Func func) const;
//! Create a copy of the array with all the triangles intersecting the projector discontinuity removed.
StelVertexArray removeDiscontinuousTriangles(const class StelProjector* prj) const;
private:
// Below we define a few methods that are templated to be optimized according to different types of VertexArray :
// The template parameter <bool T> defines whether the array has a texture.
// The template parameter <bool I> defines whether the array is indexed.
// The template parameter <bool C> defines whether the array is colored. // NEW GZ
template <bool I>
const Vec3d* specVertexAt(int i) const {
return &vertex.at(specIndiceAt<I>(i));
}
template <bool T, bool I>
const Vec2f* specTexCoordAt(int i) const {
return T ? &texCoords.at(specIndiceAt<I>(i)) : NULL;
}
// NEW GZ
template <bool C, bool I>
const Vec3f* specColorAt(int i) const {
return C ? &colors.at(specIndiceAt<I>(i)) : NULL;
}
template<bool I>
unsigned int specIndiceAt(unsigned int i) const {
return I ? indices.at(i) : i;
}
template<bool T, bool I, bool C, class Func> // GZ added bool C
inline Func specForeachTriangle(Func func) const;
};
// Serialization routines
QDataStream& operator<<(QDataStream& out, const StelVertexArray&);
QDataStream& operator>>(QDataStream& in, StelVertexArray&);
template<class Func>
Func StelVertexArray::foreachTriangle(Func func) const
{
// Here we just dispatch the method into one of the 8 possible cases // GZ NEW: 8, not 4, cases
bool textured = isTextured();
bool colored = isColored();
bool useIndice = isIndexed();
if (textured)
{
if (useIndice)
{
if (colored)
return specForeachTriangle<true, true, true, Func>(func);
else
return specForeachTriangle<true, true, false, Func>(func);
}
else // not indiced
{
if (colored)
return specForeachTriangle<true, false, true, Func>(func);
else
return specForeachTriangle<true, false, false, Func>(func);
}
}
else // not textured
{
if (useIndice)
{
if (colored)
return specForeachTriangle<false, true, true, Func>(func);
else
return specForeachTriangle<false, true, false, Func>(func);
}
else // not indiced
{
if (colored)
return specForeachTriangle<false, false, true, Func>(func);
else
return specForeachTriangle<false, false, false, Func>(func);
}
}
Q_ASSERT(0); // GZ. Just make sure...
}
template<bool T, bool I, bool C, class Func>
Func StelVertexArray::specForeachTriangle(Func func) const
{
switch (primitiveType)
{
case StelVertexArray::Triangles:
Q_ASSERT(vertex.size() % 3 == 0);
for (int i = 0; i < vertex.size(); i += 3)
{
func(specVertexAt<I>(i), specVertexAt<I>(i+1), specVertexAt<I>(i+2),
specTexCoordAt<T, I>(i), specTexCoordAt<T, I>(i+1), specTexCoordAt<T, I>(i+2),
specColorAt<C, I>(i), specColorAt<C, I>(i+1), specColorAt<C, I>(i+2),
specIndiceAt<I>(i), specIndiceAt<I>(i+1), specIndiceAt<I>(i+2));
}
break;
case StelVertexArray::TriangleFan:
{
const Vec3d* v0 = specVertexAt<I>(0);
const Vec2f* t0 = specTexCoordAt<T, I>(0);
const Vec3f* c0 = specColorAt<C, I>(0);
unsigned int i0 = specIndiceAt<I>(0);
for (int i = 1; i < vertex.size() - 1; ++i)
{
func(v0, specVertexAt<I>(i), specVertexAt<I>(i+1),
t0, specTexCoordAt<T, I>(i), specTexCoordAt<T, I>(i+1),
c0, specColorAt<C, I>(i), specColorAt<C, I>(i+1),
i0, specIndiceAt<I>(i), specIndiceAt<I>(i+1));
}
break;
}
case StelVertexArray::TriangleStrip:
{
for (int i = 2; i < vertex.size(); ++i)
{
if (i % 2 == 0)
func(specVertexAt<I>(i-2), specVertexAt<I>(i-1), specVertexAt<I>(i),
specTexCoordAt<T, I>(i-2), specTexCoordAt<T, I>(i-1), specTexCoordAt<T, I>(i),
specColorAt<C, I>(i-2), specColorAt<C, I>(i-1), specColorAt<C, I>(i),
specIndiceAt<I>(i-2), specIndiceAt<I>(i-1), specIndiceAt<I>(i));
else
func(specVertexAt<I>(i-1), specVertexAt<I>(i-2), specVertexAt<I>(i),
specTexCoordAt<T, I>(i-1), specTexCoordAt<T, I>(i-2), specTexCoordAt<T, I>(i),
specColorAt<C, I>(i-1), specColorAt<C, I>(i-2), specColorAt<C, I>(i),
specIndiceAt<I>(i-1), specIndiceAt<I>(i-2), specIndiceAt<I>(i));
}
break;
}
default:
Q_ASSERT_X(0, Q_FUNC_INFO, "unsupported primitive type");
}
return func;
}
#endif // __STELVERTEXARRAY_HPP__
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