Polygon 2D

Question

Estou com um problema ao usar glStencil, usando OPenGL e MFC...

Eis o código:

double* vertex = reinterpret_cast<double*>(data());
glVertexPointer(3, GL_DOUBLE, 0, vertex);

// We are going to do 2-pass draw: draw to stencil buffer first then draw to color buffer.
glEnable(GL_STENCIL_TEST);          // enable stencil test

glClearStencil(0);
//raw to stencil buffer only
// The reference value will be written to the stencil buffer plane if test passed
// The stencil buffer is initially set to all 0s.
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // disable writing to color buffer
glStencilFunc(GL_ALWAYS, 0x1, 0x1);
glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT);
		
//Desenha
glDrawArrays(GL_TRIANGLE_FAN,0,size());

// PASS 2: draw color buffer
// Draw again the exact same polygon to color buffer where the stencil
// value is only odd number(1). The even(0) area will be descarded.
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);    // enable writing to color buffer
glStencilFunc(GL_EQUAL, 0x1, 0x1);                  // test if it is odd(1)
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
		
glDrawArrays(GL_TRIANGLE_FAN,0,size()); 

glDisable(GL_STENCIL_TEST);

//Desenha contorno
glColor3f(0,0,0);
glDrawArrays(GL_LINE_LOOP,0,size());

Os pontos usados são: https://docs.google.com/file/d/0B8B-NIoST12WMjVjVjBvbjBteVE/edit?usp=sharing

A imagem está saindo com pontos aleatórios...

Usando GLUT funciona corretamente.

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VC++ Programmer