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#include "client/world/block.hh"
namespace client {
namespace world {
struct glvert_args {
glm::vec3 translate;
float rotate_degrees;
glm::vec3 rotate_axis;
glm::vec3 texture_offset;
};
static block::glface_t make_glface(const glvert_args& args) noexcept {
static constexpr block::glface_t glverts = {
block::glvert{{-0.5f, -0.5f, 0.0f}, {0.0f, 1.0f, 0.0f}},
block::glvert{{0.5f, -0.5f, 0.0f}, {1.0f, 1.0f, 0.0f}},
block::glvert{{0.5f, 0.5f, 0.0f}, {1.0f, 0.0f, 0.0f}},
block::glvert{{0.5f, 0.5f, 0.0f}, {1.0f, 0.0f, 0.0f}},
block::glvert{{-0.5f, 0.5f, 0.0f}, {0.0f, 0.0f, 0.0f}},
block::glvert{{-0.5f, -0.5f, 0.0f}, {0.0f, 1.0f, 0.0f}}};
// We have to be careful here not to rotate/translate a zero vector.
constexpr auto zero = glm::vec3{};
const glm::mat4 mtranslate =
args.translate == zero
? glm::mat4{1.0f}
: glm::translate(glm::mat4{1.0f}, args.translate);
const glm::mat4 mrotate =
args.rotate_axis == zero
? glm::mat4{1.0f}
: glm::rotate(glm::mat4{1.0f}, glm::radians(args.rotate_degrees),
args.rotate_axis);
block::glface_t ret;
std::ranges::transform(glverts, std::begin(ret), [&](auto f) {
f.vertice =
glm::vec3(mtranslate * mrotate * glm::vec4{f.vertice, 1.0f});
f.texture += args.texture_offset;
return f;
});
return ret;
}
static const block::glfaces_t& get_shrub_faces() noexcept {
static block::glfaces_t faces{
make_glface({.translate = {0.0f, 0.0f, 0.0f},
.rotate_degrees = 45.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 0.0f}}),
make_glface({.translate = {0.0f, 0.0f, 0.0f},
.rotate_degrees = 135.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 0.0f}}),
make_glface({.translate = {0.0f, 0.0f, 0.0f},
.rotate_degrees = 225.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 0.0f}}),
make_glface({.translate = {0.0f, 0.0f, 0.0f},
.rotate_degrees = 315.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 0.0f}})};
return faces;
}
static const block::glfaces_t& get_cube_faces() noexcept {
static block::glfaces_t faces{
make_glface({.translate = {0.0f, 0.0f, 0.5f},
.rotate_degrees = 0.0f,
.rotate_axis = {0.0f, 0.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 0.0f}}),
make_glface({.translate = {0.5f, 0.0f, 0.0f},
.rotate_degrees = 90.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 1.0f}}),
make_glface({.translate = {0.0f, 0.0f, -0.5f},
.rotate_degrees = 180.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 2.0f}}),
make_glface({.translate = {-0.5f, 0.0f, 0.0f},
.rotate_degrees = 270.0f,
.rotate_axis = {0.0f, 1.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 3.0f}}),
make_glface({.translate = {0.0f, 0.5f, 0.0f},
.rotate_degrees = -90.0f,
.rotate_axis = {1.0f, 0.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 4.0f}}),
make_glface({.translate = {0.0f, -0.5f, 0.0f},
.rotate_degrees = 90.0f,
.rotate_axis = {1.0f, 0.0f, 0.0f},
.texture_offset = {0.0f, 0.0f, 5.0f}}),
};
return faces;
}
enum block::draw_type
block::get_draw_type(const enum block::type& type) noexcept {
using t = enum shared::world::block::type;
switch (type) {
case t::dead_shrub:
case t::shrub:
case t::snowy_shrub:
return draw_type::custom;
default:
return draw_type::block;
}
}
const block::glfaces_t&
block::get_glfaces(const enum block::type& type) noexcept {
const auto draw_type = get_draw_type(type);
if (draw_type == block::draw_type::custom) {
return get_shrub_faces();
}
return get_cube_faces();
}
} // namespace world
} // namespace client
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