Add Drawlist

- Add Pool iterator support
- Add Pool Expandability
- Add Pool::Push
- Add Lithium Maths API
- Remove InitPools
- update spirv-helper

source/lithium/math.cpp

@@ -0,0 +1,65 @@
+#include <pd/lithium/math.hpp>
+
+namespace PD {
+namespace Li {
+namespace Math {
+PD_API bool InBounds(const fvec2& pos, const fvec2& size, const fvec4& rect) {
+  return (pos.x + size.x >= rect.x && pos.y + size.y >= rect.y &&
+          pos.x <= rect.z && pos.y <= rect.w);
+}
+
+PD_API bool InBounds(const fvec2& pos, const fvec4& rect) {
+  return (pos.x > rect.x && pos.x < rect.x + rect.z && pos.y > rect.y &&
+          pos.y < rect.y + rect.w);
+}
+
+PD_API bool InBounds(const fvec2& a, const fvec2& b, const fvec2& c,
+                     const fvec4& rect) {
+  return ((a.x < rect.z && b.x < rect.z && c.x < rect.z) ||
+          (a.y < rect.w && b.y < rect.w && c.y < rect.w) ||
+          (a.x > 0 && b.x > 0 && c.x > 0) || (a.y > 0 && b.y > 0 && c.y > 0));
+}
+
+PD_API void RotateCorner(fvec2& pos, float sinus, float cosinus) {
+  float x = pos.x * cosinus - pos.y * sinus;
+  float y = pos.y * cosinus - pos.x * sinus;
+  pos = fvec2(x, y);
+}
+
+PD_API Rect PrimRect(const fvec2& pos, const fvec2& size, float a) {
+  fvec2 c = size * 0.5f;  // Center
+  fvec2 corner[4] = {
+      fvec2(-c.x, -c.y),
+      fvec2(-c.x + size.x, -c.y),
+      fvec2(-c.x, -c.y + size.y),
+      fvec2(-c.x + size.x, -c.y + size.y),
+  };
+
+  // Only rotate if required
+  if (a != 0.f) {
+    float s = std::sin(a);
+    float co = std::cos(a);
+    for (int i = 0; i < 4; i++) {
+      RotateCorner(corner[i], s, co);
+    }
+  }
+
+  // Return Result
+  return Rect(corner[0] + pos + c, corner[1] + pos + c, corner[2] + pos + c,
+              corner[3] + pos + c);
+}
+
+PD_API Rect PrimLine(const fvec2& a, const fvec2& b, int t) {
+  // Using the vec maths api makes the code as short as it is
+  vec2 dir = a - b;
+  float len = dir.Len();
+  vec2 unit_dir = dir / len;
+  vec2 perpendicular(-unit_dir.y, unit_dir.x);
+  vec2 off = perpendicular * ((float)t * 0.5f);
+
+  return Rect(a + off, b + off, a - off, b - off);
+}
+
+}  // namespace Math
+}  // namespace Li
+}  // namespace PD