static void CALLBACK Paint(void)
{
glViewport(0,0,windW,windH);
glDisable(GL_SCISSOR_TEST);
glPushAttrib(GL_COLOR_BUFFER_BIT);
glColorMask(1,1,1,1);
glIndexMask((GLuint)~0);
glClearColor(0.0,0.0,0.0,0.0);
glClear(GL_COLOR_BUFFER_BIT);
glPopAttrib();
if(mode1)glShadeModel(GL_SMOOTH);
else glShadeModel(GL_FLAT);
if(mode2)glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
else glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
Viewport(0,0); Point();
Viewport(0,1); Lines();
Viewport(0,2); LineStrip();
Viewport(0,3); LineLoop();
Viewport(1,0); Bitmap();
Viewport(1,1); TriangleFan();
Viewport(1,2); Triangles();
Viewport(1,3); TriangleStrip();
Viewport(2,0); Rect();
Viewport(2,1); xPolygon();
Viewport(2,2); Quads();
Viewport(2,3); QuadStrip();
glFlush();
if(doubleBuffer)auxSwapBuffers();
}
static void Draw(EGLDisplay dpy, EGLSurface surf)
{
glViewport(0, 0, windW, windH);
glDisable(GL_SCISSOR_TEST);
glPushAttrib(GL_COLOR_BUFFER_BIT);
glColorMask(1, 1, 1, 1);
glIndexMask(~0);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glPopAttrib();
if (mode1) {
glShadeModel(GL_SMOOTH);
} else {
glShadeModel(GL_FLAT);
}
if (mode2) {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
} else {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
}
Viewport(0, 0); Point();
Viewport(0, 1); Lines();
Viewport(0, 2); LineStrip();
Viewport(0, 3); LineLoop();
Viewport(1, 0); Bitmap();
Viewport(1, 1); TriangleFan();
Viewport(1, 2); Triangles();
Viewport(1, 3); TriangleStrip();
Viewport(2, 0); Rect();
Viewport(2, 1); PolygonFunc();
Viewport(2, 2); Quads();
Viewport(2, 3); QuadStrip();
glFlush();
if (doubleBuffer) {
eglSwapBuffers(dpy, surf);
}
}
// **** Tetrahedral Polygonization ****
// doTetra: triangulate the tetrahedron
// b, c, d should appear clockwise when viewed from a
void IsoSurfacePolygonizer::doTetra(const HashedCubeCorner &a, const HashedCubeCorner &b, const HashedCubeCorner &c, const HashedCubeCorner &d) {
m_statistics.m_doTetraCalls++;
BYTE index = 0;
if(a.m_positive) index |= 8;
if(b.m_positive) index |= 4;
if(c.m_positive) index |= 2;
if(d.m_positive) index |= 1;
// index is now 4-bit number representing one of the 16 possible cases
int ab, ac, ad, bc, bd, cd;
if(a.m_positive != b.m_positive) ab = getVertexId(a, b);
if(a.m_positive != c.m_positive) ac = getVertexId(a, c);
if(a.m_positive != d.m_positive) ad = getVertexId(a, d);
if(b.m_positive != c.m_positive) bc = getVertexId(b, c);
if(b.m_positive != d.m_positive) bd = getVertexId(b, d);
if(c.m_positive != d.m_positive) cd = getVertexId(c, d);
// 14 productive tetrahedral cases (0000 and 1111 do not yield polygons
TriangleStrip ts;
switch (index) {
case 0: //----
case 15: //++++
m_statistics.m_nonProduktiveCalls++;
return;
case 1: ts = TriangleStrip(ad,bd,cd ); break; //---+
case 2: ts = TriangleStrip(ac,cd,bc ); break; //--+-
case 3: ts = TriangleStrip(ad,bd,bc,ac); break; //--++
case 4: ts = TriangleStrip(ab,bc,bd ); break; //-+--
case 5: ts = TriangleStrip(ad,ab,bc,cd); break; //-+-+
case 6: ts = TriangleStrip(ab,ac,cd,bd); break; //-++-
case 7: ts = TriangleStrip(ab,ac,ad ); break; //-+++
case 8: ts = TriangleStrip(ab,ad,ac ); break; //+---
case 9: ts = TriangleStrip(ab,bd,cd,ac); break; //+--+
case 10: ts = TriangleStrip(ab,ad,cd,bc); break; //+-+-
case 11: ts = TriangleStrip(ab,bd,bc ); break; //+-++
case 12: ts = TriangleStrip(ad,ac,bc,bd); break; //++--
case 13: ts = TriangleStrip(ac,bc,cd ); break; //++-+
case 14: ts = TriangleStrip(ad,cd,bd ); break; //+++-
default: throwException(_T("doTetra:Invalid index:%d"), index);
}
putTriangleStrip(ts);
}
