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#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
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