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#include <cassert>
#include <cstdio>
#include "glu3.h"
class check_sphere : public GLUshapeConsumer {
public:
check_sphere(const GLUshape &shape, double r) :
pass(true), vert(0), prim(0), elts(0), r(r), mode(0)
{
primitive_count = shape.primitive_count();
vertex_count = shape.vertex_count();
}
bool pass;
unsigned vert;
unsigned prim;
unsigned elts;
double r;
GLenum mode;
unsigned vertex_count;
unsigned primitive_count;
virtual void vertex(const GLUvec4 &position,
const GLUvec4 &normal,
const GLUvec4 &tangent,
const GLUvec4 &tex_coord)
{
printf("vert %u: {%.3f %.3f %.3f %.3f} ",
vert,
position.values[0],
position.values[1],
position.values[2],
position.values[3]);
printf("{%.3f %.3f %.3f %.3f} ",
normal.values[0],
normal.values[1],
normal.values[2],
normal.values[3]);
printf("{%.3f %.3f %.3f %.3f} ",
tangent.values[0],
tangent.values[1],
tangent.values[2],
tangent.values[3]);
printf("{%.3f %.3f %.3f %.3f}\n",
tex_coord.values[0],
tex_coord.values[1],
tex_coord.values[2],
tex_coord.values[3]);
if (fabs(gluLength(normal) - 1.0) > 0.00001) {
printf("vert %u: bad normal |n| = %f\n",
vert,
gluLength(normal));
pass = false;
}
if (fabs(gluLength(tangent) - 1.0) > 0.00001) {
printf("vert %u: bad tangent |t| = %f\n",
vert,
gluLength(tangent));
pass = false;
}
GLUvec4 p_dir(position);
p_dir.values[3] = 0.0;
if (fabs(gluLength(p_dir) - r) > 0.00001) {
printf("vert %u: bad position |p| = %f vs. %f expected\n",
vert,
gluLength(p_dir),
r);
pass = false;
}
if (position.values[3] != 1.0) {
printf("vert %u: bad position W = %f\n",
vert,
position.values[3]);
pass = false;
}
const GLUvec4 p_norm(gluNormalize(p_dir));
if (fabs(gluDot3(p_norm, normal) - 1.0) > 0.00001) {
printf("vert %u: bad position or normal direction\n",
vert);
pass = false;
}
/* The tangent and the normal must always be orthogonal to
* each other, so the dot-product must be zero.
*/
if (fabs(gluDot3(tangent, normal)) > 0.000001) {
printf("vert %u: bad tangent or normal direction\n",
vert);
pass = false;
}
vert++;
}
virtual void begin_primitive(GLenum mode)
{
printf("prim %u: begin\n", prim);
if (this->mode != 0) {
printf("prim %u: bad primitive begin inside another "
"begin\n",
prim);
pass = false;
}
if (prim == primitive_count) {
printf("prim %u: too many primitives\n",
prim);
pass = false;
}
switch (mode) {
case GL_TRIANGLES:
case GL_TRIANGLE_STRIP:
case GL_TRIANGLE_FAN:
break;
default:
printf("prim %u: invalid primitive mode 0x%04x\n",
prim, mode);
pass = false;
break;
}
this->mode = mode;
}
virtual void index(unsigned idx)
{
printf("prim %u, elt %u: %u\n", prim, elts, idx);
if (idx >= vertex_count) {
printf("prim %u, elt %u: bad elt %u > %u\n",
prim, elts, idx, vertex_count - 1);
pass = false;
}
elts++;
}
virtual void end_primitive(void)
{
printf("prim %u: end\n", prim);
if (this->mode == 0) {
printf("prim %u: bad primitive end outside begin\n",
prim);
pass = false;
}
mode = 0;
prim++;
}
};
int
main(int argc, char **argv)
{
GLUsphere s(4.0, 5, 5);
check_sphere c(s, 4.0);
s.generate(& c);
assert(c.pass);
assert(c.vert == s.vertex_count());
assert(c.prim == s.primitive_count());
assert(c.elts == s.element_count());
return 0;
}
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