From 8443be72504d58179f09e31ebdaf32102cce72ba Mon Sep 17 00:00:00 2001
From: Ian Romanick <idr@freedesktop.org>
Date: Mon, 15 Feb 2010 15:18:49 -0800
Subject: GLUshape: Add simple test for GLUsphere shape generator

---
 .gitignore       |   1 +
 test/Makefile.am |   6 +-
 test/sphere.cpp  | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 178 insertions(+), 1 deletion(-)
 create mode 100644 test/sphere.cpp

diff --git a/.gitignore b/.gitignore
index 8428217..6d44a95 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,4 +20,5 @@ test/.deps
 test/add4v_4v
 test/lookat4v
 test/det
+test/sphere
 docs/
diff --git a/test/Makefile.am b/test/Makefile.am
index 4e4338e..4d39824 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -1,10 +1,14 @@
 AM_CFLAGS = -I$(srcdir)/../include
+AM_CPPFLAGS = -I$(srcdir)/../include
 LDADD = ../src/libGLU3.a -lm
 
+sphere_SOURCES = sphere.cpp
+
 TESTS = \
 	add4v_4v \
 	lookat4v \
-	det
+	det \
+	sphere
 
 EXTRA_PROGRAMS = $(TESTS)
 CLEANFILES = $(EXTRA_PROGRAMS)
diff --git a/test/sphere.cpp b/test/sphere.cpp
new file mode 100644
index 0000000..9f5d94a
--- /dev/null
+++ b/test/sphere.cpp
@@ -0,0 +1,172 @@
+#include <cassert>
+#include <cstdio>
+#include "glu3.h"
+
+class check_sphere : public GLUsphere {
+public:
+	check_sphere(double r, int sl, int st) :
+		GLUsphere(r, sl, st), pass(true), vert(0),
+		prim(0), elts(0), r(r), mode(0)
+	{
+	}
+
+	bool pass;
+	unsigned vert;
+	unsigned prim;
+	unsigned elts;
+	double r;
+	GLenum mode;
+
+protected:
+	virtual void emit_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 emit_begin(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 emit_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 emit_end(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)
+{
+	check_sphere s(4.0, 5, 5);
+
+	s.generate();
+	assert(s.pass);
+	assert(s.vert == s.vertex_count());
+	assert(s.prim == s.primitive_count());
+	assert(s.elts == s.element_count());
+	return 0;
+}
-- 
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