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#include "wall.hpp"
#include "tile-atlas.hpp"
#include "shaders/tile.hpp"
#include "chunk.hpp"
#include "tile-image.hpp"
#include "anim-atlas.hpp"
#include <Magnum/GL/Texture.h>
#include <Magnum/GL/MeshView.h>
namespace floormat {
//#define FM_DEBUG_DRAW_COUNT
constexpr auto quad_index_count = 6;
wall_mesh::wall_mesh() = default;
void wall_mesh::draw(tile_shader& shader, chunk& c)
{
auto [mesh_, ids] = c.ensure_wall_mesh();
tile_atlas* last_atlas = nullptr;
std::size_t last_pos = 0;
GL::MeshView mesh{mesh_};
[[maybe_unused]] std::size_t draw_count = 0;
const auto do_draw = [&](std::size_t i, tile_atlas* atlas) {
if (atlas == last_atlas)
return;
if (auto len = i - last_pos; last_atlas && len > 0)
{
last_atlas->texture().bind(0);
mesh.setCount((int)(quad_index_count * len));
mesh.setIndexRange((int)(last_pos*quad_index_count), 0, quad_index_count*TILE_COUNT*2 - 1);
shader.draw(mesh);
draw_count++;
}
last_atlas = atlas;
last_pos = i;
};
for (std::size_t k = 0; k < TILE_COUNT*2; k++)
{
const std::size_t i = ids[k];
if (auto* atlas = c.wall_atlas_at(i))
do_draw(k, atlas);
}
do_draw(TILE_COUNT*2, nullptr);
#ifdef FM_DEBUG_DRAW_COUNT
if (draw_count)
fm_debug("wall draws: %zu", draw_count);
#endif
}
} // namespace floormat
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