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#include "floor.hpp"
#include "shaders/shader.hpp"
#include "src/chunk.hpp"
#include "src/ground-atlas.hpp"
#include "compat/assert.hpp"
#include <Magnum/GL/MeshView.h>
namespace floormat {
floor_mesh::floor_mesh() = default;
void floor_mesh::draw(tile_shader& shader, chunk& c)
{
constexpr int quad_index_count = 6;
const auto [mesh_, ids, size] = c.ensure_ground_mesh();
struct {
ground_atlas* atlas = nullptr; size_t pos = 0; } last;
GL::MeshView mesh{mesh_};
[[maybe_unused]] size_t draw_count = 0;
fm_debug_assert(size_t(mesh_.count()) == size*quad_index_count);
const auto do_draw = [&](size_t i, ground_atlas* atlas, uint32_t max_index) {
if (atlas == last.atlas)
return;
if (auto len = i - last.pos; last.atlas && len > 0)
{
mesh.setCount((int)(quad_index_count * len));
mesh.setIndexOffset((int)(last.pos*quad_index_count), 0, max_index);
shader.draw(last.atlas->texture(), mesh);
draw_count++;
}
last = { atlas, i };
};
const auto max_index = uint32_t(size*quad_index_count - 1);
size_t k;
for (k = 0; k < size; k++)
do_draw(k, c.ground_atlas_at(ids[k]), max_index);
do_draw(size, nullptr, max_index);
//#define FM_DEBUG_DRAW_COUNT
#ifdef FM_DEBUG_DRAW_COUNT
if (draw_count)
fm_debug("floor draws: %zu", draw_count);
#endif
}
} // namespace floormat
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