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#include "camera-offset.hpp"
#include "tile-defs.hpp"
#include "shaders/tile.hpp"
namespace floormat {
with_shifted_camera_offset::with_shifted_camera_offset(tile_shader& shader, chunk_coords_ c_, chunk_coords first_, chunk_coords last_) :
_shader{shader},
_camera{shader.camera_offset()}
{
fm_assert(shader.depth_offset() == 0.f);
constexpr auto chunk_size = TILE_MAX_DIM20d*dTILE_SIZE;
auto offset = _camera + tile_shader::project(Vector3d(c_.x, c_.y, 0) * chunk_size);
auto pos = Vector2d(chunk_coords(c_) - first_);
auto len = Vector2d(last_ - first_) + Vector2d(1, 1);
auto pos1 = pos.y() * len.x() + pos.x();
auto z = c_.z - chunk_z_min;
constexpr auto depth_start = -1 + 1.111e-16;
double chunk_offset, tile_offset;
if (c_.z < chunk_z_max)
{
chunk_offset = depth_start + tile_shader::depth_chunk_size * pos1;
tile_offset = (double)tile_shader::depth_value({z, z});
}
else
{
chunk_offset = 1;
tile_offset = 0;
}
double depth_offset_ = chunk_offset + tile_offset;
auto depth_offset = (float)depth_offset_;
_shader.set_camera_offset(offset, depth_offset);
}
with_shifted_camera_offset::~with_shifted_camera_offset()
{
_shader.set_camera_offset(_camera, 0);
}
} // namespace floormat
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