Add rotate_x/y_axis functions and unit tests

1 files changed, 19 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 0cc151b..a9d4c74 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -42,6 +42,22 @@ static float orbit_angle = 0.0f;
 static float eye_distance = 15.0f;
 static float fov = 45.0f;
 
+GLUmat4 rotate_x_axis(float theta)
+{
+	return GLUmat4 (GLUvec4 (1.0f,         0.0f,        0.0f, 0.0f),
+			GLUvec4 (0.0f,  cosf(theta), sinf(theta), 0.0f),
+			GLUvec4 (0.0f, -sinf(theta), cosf(theta), 0.0f),
+			GLUvec4 (0.0f,         0.0f,        0.0f, 1.0f));
+}
+
+GLUmat4 rotate_y_axis(float theta)
+{
+	return GLUmat4 (GLUvec4 (cosf(theta), 0.0f, -sinf(theta), 0.0f),
+			GLUvec4 (0.0f,        1.0f,         0.0f, 0.0f),
+			GLUvec4 (sinf(theta), 0.0f,  cosf(theta), 0.0f),
+			GLUvec4 (0.0f,        0.0f,         0.0f, 1.0f));
+}
+
 static Uint32 t0;
 
 static GLuint bo;
@@ -473,6 +489,7 @@ timer_callback(Uint32 interval, void *not_used)
 	return interval;
 }
 
+extern void check_rotation(void);
 
 int
 main(int argc, char **argv)
@@ -480,6 +497,8 @@ main(int argc, char **argv)
 	(void) argc;
 	(void) argv;
 
+	check_rotation();
+
 	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) < 0) {
 		exit(1);
 	}