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#include <glu3.h>
#include <assert.h>
static GLboolean vec4_equals(const GLUvec4 *a, const GLUvec4 *b)
{
int i;
for (i = 0; i < 4; i++) {
if (a->values[i] != b->values[i])
return GL_FALSE;
}
return GL_TRUE;
}
static void vec4_divide(GLUvec4 *a)
{
a->values[0] /= a->values[3];
a->values[1] /= a->values[3];
a->values[2] /= a->values[3];
a->values[3] = 1.0;
}
int main(int argc, char **argv)
{
GLUvec4 a = {{1.0, 2.0, 1.0, 1.0}};
GLUvec4 b = {{-2.0, 3.0, 1.0, 1.0}};
GLUvec4 result;
GLUmat4 identity_frustum;
(void)argc;
(void)argv;
gluFrustum6(&identity_frustum,
-1, 1,
-1, 1,
-1, 1);
gluMult4m_4v(&result, &identity_frustum, &a);
vec4_divide(&result);
assert(vec4_equals(&result, &a));
gluMult4m_4v(&result, &identity_frustum, &b);
vec4_divide(&result);
assert(vec4_equals(&result, &b));
return 0;
}
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