1 files changed, 45 insertions, 0 deletions
diff --git a/test/frustum6.c b/test/frustum6.c
new file mode 100644
index 0000000..f520168
--- /dev/null
+++ b/test/frustum6.c
@@ -0,0 +1,45 @@
+#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;
+}