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// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
//============================================================
//
// effectmanager.cpp - BGFX shader effect manager
//
// Maintains a string-to-entry lookup of BGFX shader
// effects, defined by effect.h and read by effectreader.h
//
//============================================================
#include "effectmanager.h"
#include "effect.h"
#include "effectreader.h"
#include "shadermanager.h"
#include "path.h"
#include "osdfile.h"
#include "modules/lib/osdobj_common.h"
#include <rapidjson/document.h>
#include <rapidjson/error/en.h>
#include <bx/readerwriter.h>
#include <bx/file.h>
#include <bgfx/bgfx.h>
#include <utility>
static bool prepare_effect_document(const std::string &name, const osd_options &options, rapidjson::Document &document)
{
std::string full_name = name;
if (full_name.length() < 5 || (full_name.compare(full_name.length() - 5, 5, ".json") != 0))
{
full_name += ".json";
}
const std::string path = util::path_concat(options.bgfx_path(), "effects", full_name);
bx::FileReader reader;
if (!bx::open(&reader, path.c_str()))
{
osd_printf_error("Unable to open effect file %s\n", path);
return false;
}
const int32_t size = bx::getSize(&reader);
std::unique_ptr<char []> data(new (std::nothrow) char [size + 1]);
if (!data)
{
osd_printf_error("Out of memory reading effect file %s\n", path);
bx::close(&reader);
return false;
}
bx::ErrorAssert err;
bx::read(&reader, reinterpret_cast<void*>(data.get()), size, &err);
bx::close(&reader);
data[size] = 0;
document.Parse<rapidjson::kParseCommentsFlag>(data.get());
data.reset();
if (document.HasParseError())
{
std::string error(rapidjson::GetParseError_En(document.GetParseError()));
osd_printf_error("Unable to parse effect %s. Errors returned:\n%s\n", path, error);
return false;
}
return true;
}
// keep constructor and destructor out-of-line so the header works with forward declarations
effect_manager::effect_manager(shader_manager& shaders) : m_shaders(shaders)
{
}
effect_manager::~effect_manager()
{
// the map will automatically dispose of the effects
}
bgfx_effect* effect_manager::get_or_load_effect(const osd_options &options, const std::string &name)
{
const auto iter = m_effects.find(name);
if (iter != m_effects.end())
return iter->second.get();
return load_effect(options, name);
}
bgfx_effect* effect_manager::load_effect(const osd_options &options, const std::string &name)
{
rapidjson::Document document;
if (!prepare_effect_document(name, options, document))
{
return nullptr;
}
std::unique_ptr<bgfx_effect> effect = effect_reader::read_from_value(name, document, "Effect '" + name + "': ", options, m_shaders);
if (!effect)
{
osd_printf_error("Unable to load effect %s\n", name);
return nullptr;
}
return m_effects.emplace(name, std::move(effect)).first->second.get();
}
bool effect_manager::validate_effect(const osd_options &options, const std::string &name)
{
rapidjson::Document document;
if (!prepare_effect_document(name, options, document))
{
return false;
}
return effect_reader::validate_value(document, "Effect '" + name + "': ", options);
}
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