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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;
const auto offset = _camera + tile_shader::project(Vector3d(c) * chunk_size);
const auto len_x = (float)(last.x - first.x), cx = (float)(c.x - first.x), cy = (float)(c.y - first.y);
const float depth_offset = shader.depth_tile_size*(cy*TILE_MAX_DIM*len_x*TILE_MAX_DIM + cx*TILE_MAX_DIM);
_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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