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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup obj
*/
#pragma once
#include <cstdio>
#include <string>
#include <type_traits>
#include <vector>
#include "BLI_compiler_attrs.h"
#include "BLI_fileops.h"
#include "BLI_string_ref.hh"
#include "BLI_utility_mixins.hh"
/* SEP macro from BLI path utils clashes with SEP symbol in fmt headers. */
#undef SEP
#define FMT_HEADER_ONLY
#include <fmt/format.h>
namespace blender::io::obj {
/**
* File buffer writer.
* All writes are done into an internal chunked memory buffer
* (list of default 64 kilobyte blocks).
* Call write_fo_file once in a while to write the memory buffer(s)
* into the given file.
*/
class FormatHandler : NonCopyable, NonMovable {
private:
typedef std::vector<char> VectorChar;
std::vector<VectorChar> blocks_;
size_t buffer_chunk_size_;
public:
FormatHandler(size_t buffer_chunk_size = 64 * 1024) : buffer_chunk_size_(buffer_chunk_size)
{
}
/* Write contents to the buffer(s) into a file, and clear the buffers. */
void write_to_file(FILE *f)
{
for (const auto &b : blocks_)
fwrite(b.data(), 1, b.size(), f);
blocks_.clear();
}
std::string get_as_string() const
{
std::string s;
for (const auto &b : blocks_)
s.append(b.data(), b.size());
return s;
}
size_t get_block_count() const
{
return blocks_.size();
}
void append_from(FormatHandler &v)
{
blocks_.insert(blocks_.end(),
std::make_move_iterator(v.blocks_.begin()),
std::make_move_iterator(v.blocks_.end()));
v.blocks_.clear();
}
void write_obj_vertex(float x, float y, float z)
{
write_impl("v {:.6f} {:.6f} {:.6f}\n", x, y, z);
}
void write_obj_vertex_color(float x, float y, float z, float r, float g, float b)
{
write_impl("v {:.6f} {:.6f} {:.6f} {:.4f} {:.4f} {:.4f}\n", x, y, z, r, g, b);
}
void write_obj_uv(float x, float y)
{
write_impl("vt {:.6f} {:.6f}\n", x, y);
}
void write_obj_normal(float x, float y, float z)
{
write_impl("vn {:.4f} {:.4f} {:.4f}\n", x, y, z);
}
void write_obj_poly_begin()
{
write_impl("f");
}
void write_obj_poly_end()
{
write_obj_newline();
}
void write_obj_poly_v_uv_normal(int v, int uv, int n)
{
write_impl(" {}/{}/{}", v, uv, n);
}
void write_obj_poly_v_normal(int v, int n)
{
write_impl(" {}//{}", v, n);
}
void write_obj_poly_v_uv(int v, int uv)
{
write_impl(" {}/{}", v, uv);
}
void write_obj_poly_v(int v)
{
write_impl(" {}", v);
}
void write_obj_usemtl(StringRef s)
{
write_impl("usemtl {}\n", s);
}
void write_obj_mtllib(StringRef s)
{
write_impl("mtllib {}\n", s);
}
void write_obj_smooth(int s)
{
write_impl("s {}\n", s);
}
void write_obj_group(StringRef s)
{
write_impl("g {}\n", s);
}
void write_obj_object(StringRef s)
{
write_impl("o {}\n", s);
}
void write_obj_edge(int a, int b)
{
write_impl("l {} {}\n", a, b);
}
void write_obj_cstype()
{
write_impl("cstype bspline\n");
}
void write_obj_nurbs_degree(int deg)
{
write_impl("deg {}\n", deg);
}
void write_obj_curve_begin()
{
write_impl("curv 0.0 1.0");
}
void write_obj_curve_end()
{
write_obj_newline();
}
void write_obj_nurbs_parm_begin()
{
write_impl("parm u 0.0");
}
void write_obj_nurbs_parm(float v)
{
write_impl(" {:.6f}", v);
}
void write_obj_nurbs_parm_end()
{
write_impl(" 1.0\n");
}
void write_obj_nurbs_group_end()
{
write_impl("end\n");
}
void write_obj_newline()
{
write_impl("\n");
}
void write_mtl_newmtl(StringRef s)
{
write_impl("newmtl {}\n", s);
}
void write_mtl_float(const char *type, float v)
{
write_impl("{} {:.6f}\n", type, v);
}
void write_mtl_float3(const char *type, float r, float g, float b)
{
write_impl("{} {:.6f} {:.6f} {:.6f}\n", type, r, g, b);
}
void write_mtl_illum(int mode)
{
write_impl("illum {}\n", mode);
}
/* NOTE: options, if present, will have its own leading space. */
void write_mtl_map(const char *type, StringRef options, StringRef value)
{
write_impl("{}{} {}\n", type, options, value);
}
void write_string(StringRef s)
{
write_impl("{}\n", s);
}
private:
/* Ensure the last block contains at least this amount of free space.
* If not, add a new block with max of block size & the amount of space needed. */
void ensure_space(size_t at_least)
{
if (blocks_.empty() || (blocks_.back().capacity() - blocks_.back().size() < at_least)) {
VectorChar &b = blocks_.emplace_back(VectorChar());
b.reserve(std::max(at_least, buffer_chunk_size_));
}
}
template<typename... T> void write_impl(const char *fmt, T &&...args)
{
/* Format into a local buffer. */
fmt::memory_buffer buf;
fmt::format_to(fmt::appender(buf), fmt, std::forward<T>(args)...);
size_t len = buf.size();
ensure_space(len);
VectorChar &bb = blocks_.back();
bb.insert(bb.end(), buf.begin(), buf.end());
}
};
} // namespace blender::io::obj
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