Move game sources into src subdirectory

1 files changed, 107 insertions, 0 deletions

diff --git a/src/core/angles.hh b/src/core/angles.hh
new file mode 100644
index 0000000..a2a3d55
--- /dev/null
+++ b/src/core/angles.hh
@@ -0,0 +1,107 @@
+#ifndef CORE_ANGLES_HH
+#define CORE_ANGLES_HH 1
+#pragma once
+
+#include "core/constexpr.hh"
+
+constexpr float A180 = vx::radians(180.0f);
+constexpr float A360 = vx::radians(360.0f);
+
+namespace cxangles
+{
+float wrap_180(float angle);
+float wrap_360(float angle);
+} // namespace cxangles
+
+namespace cxangles
+{
+glm::fvec3 wrap_180(const glm::fvec3& angles);
+glm::fvec3 wrap_360(const glm::fvec3& angles);
+} // namespace cxangles
+
+namespace cxangles
+{
+void vectors(const glm::fvec3& angles, glm::fvec3& forward);
+void vectors(const glm::fvec3& angles, glm::fvec3* forward, glm::fvec3* right, glm::fvec3* up);
+} // namespace cxangles
+
+inline float cxangles::wrap_180(float angle)
+{
+    const auto result = std::fmod(angle + A180, A360);
+
+    if(result < 0.0f) {
+        return result + A180;
+    }
+
+    return result - A180;
+}
+
+inline float cxangles::wrap_360(float angle)
+{
+    return std::fmod(std::fmod(angle, A360) + A360, A360);
+}
+
+inline glm::fvec3 cxangles::wrap_180(const glm::fvec3& angles)
+{
+    return glm::fvec3 {
+        cxangles::wrap_180(angles.x),
+        cxangles::wrap_180(angles.y),
+        cxangles::wrap_180(angles.z),
+    };
+}
+
+inline glm::fvec3 cxangles::wrap_360(const glm::fvec3& angles)
+{
+    return glm::fvec3 {
+        cxangles::wrap_360(angles.x),
+        cxangles::wrap_360(angles.y),
+        cxangles::wrap_360(angles.z),
+    };
+}
+
+inline void cxangles::vectors(const glm::fvec3& angles, glm::fvec3& forward)
+{
+    const float cosp = std::cos(angles.x);
+    const float cosy = std::cos(angles.y);
+    const float sinp = std::sin(angles.x);
+    const float siny = std::sin(angles.y);
+
+    forward.x = cosp * siny * (-1.0f);
+    forward.y = sinp;
+    forward.z = cosp * cosy * (-1.0f);
+}
+
+inline void cxangles::vectors(const glm::fvec3& angles, glm::fvec3* forward, glm::fvec3* right, glm::fvec3* up)
+{
+    if(!forward && !right && !up) {
+        // There's no point in figuring out
+        // direction vectors if nothing is passed
+        // in the function to store that stuff in
+        return;
+    }
+
+    const auto pcv = glm::cos(angles);
+    const auto psv = glm::sin(angles);
+    const auto ncv = pcv * (-1.0f);
+    const auto nsv = psv * (-1.0f);
+
+    if(forward) {
+        forward->x = pcv.x * nsv.y;
+        forward->y = psv.x;
+        forward->z = pcv.x * ncv.y;
+    }
+
+    if(right) {
+        right->x = pcv.z * pcv.y;
+        right->y = psv.z * pcv.y;
+        right->z = nsv.y;
+    }
+
+    if(up) {
+        up->x = psv.x * psv.y * pcv.z + ncv.y * psv.z;
+        up->y = pcv.x * pcv.z;
+        up->z = nsv.x * ncv.y * pcv.z + psv.y * psv.z;
+    }
+}
+
+#endif /* CORE_ANGLES_HH */