a wip

1 files changed, 60 insertions, 0 deletions

diff --git a/src/quads.cpp b/src/quads.cpp
new file mode 100644
index 00000000..a02654b0
--- /dev/null
+++ b/src/quads.cpp
@@ -0,0 +1,60 @@
+#include "quads.hpp"
+
+namespace floormat::Quads {
+
+std::array<UnsignedShort, 6> quad_indexes(size_t N)
+{
+    using u16 = UnsignedShort;
+    return {                                        /* 3--1  1 */
+        (u16)(0+N*4), (u16)(1+N*4), (u16)(2+N*4),   /* | /  /| */
+        (u16)(2+N*4), (u16)(1+N*4), (u16)(3+N*4),   /* |/  / | */
+    };                                              /* 2  2--0 */
+}
+
+quad floor_quad(const Vector3 center, const Vector2 size)
+{
+    float x = size[0]*.5f, y = size[1]*.5f;
+    return {{
+        { x + center[0], -y + center[1], center[2]},
+        { x + center[0],  y + center[1], center[2]},
+        {-x + center[0], -y + center[1], center[2]},
+        {-x + center[0],  y + center[1], center[2]},
+    }};
+}
+
+quad wall_quad_W(const Vector3 center, const Vector3 size)
+{
+    float x = size[0]*.5f, y = size[1]*.5f, z = size[2];
+    return {{
+        {-x + center[0],  y + center[1], z + center[2] },
+        {-x + center[0],  y + center[1],     center[2] },
+        {-x + center[0], -y + center[1], z + center[2] },
+        {-x + center[0], -y + center[1],     center[2] },
+    }};
+}
+
+quad wall_quad_N(const Vector3 center, const Vector3 size)
+{
+    float x = size[0]*.5f, y = size[1]*.5f, z = size[2];
+    return {{
+        { x + center[0], -y + center[1], z + center[2] },
+        { x + center[0], -y + center[1],     center[2] },
+        {-x + center[0], -y + center[1], z + center[2] },
+        {-x + center[0], -y + center[1],     center[2] },
+    }};
+}
+
+texcoords texcoords_at(Vector2ui pos_, Vector2ui size_, Vector2ui image_size_)
+{
+    auto pos = Vector2(pos_), size = Vector2(size_), image_size = Vector2(image_size_);
+    auto offset = pos + Vector2(.5f), end = offset + size - Vector2(1);
+    auto x0 = offset / image_size, x1 = end / image_size;
+    return {{
+        { x1.x(), 1.f - x1.y() }, // bottom right
+        { x1.x(), 1.f - x0.y() }, // top right
+        { x0.x(), 1.f - x1.y() }, // bottom left
+        { x0.x(), 1.f - x0.y() }, // top left
+    }};
+}
+
+} // namespace floormat::Quads