obs-StreamFX/source/obs/gs/gs-effect.cpp
2019-12-21 18:20:36 +01:00

152 lines
3.8 KiB
C++

/*
* Modern effects for a modern Streamer
* Copyright (C) 2017 Michael Fabian Dirks
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "gs-effect.hpp"
#include <fstream>
#include <stdexcept>
#include <vector>
#include "obs/gs/gs-helper.hpp"
// OBS
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4201)
#endif
#include <graphics/effect.h>
#include <obs.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#define MAX_EFFECT_SIZE 32 * 1024 * 1024
static std::string load_file_as_code(std::filesystem::path file)
{
uintmax_t size = std::filesystem::file_size(file);
if (size > MAX_EFFECT_SIZE) {
throw std::runtime_error("File is too large to be loaded.");
}
std::ifstream ifs(file, std::ios::binary);
if (!ifs.is_open() || ifs.bad()) {
throw std::runtime_error("An unknown error occured trying to open the file.");
}
std::vector<char> buf(size_t(size + 1), 0);
ifs.read(buf.data(), static_cast<std::streamsize>(size));
return std::string(buf.data(), buf.data() + size);
}
gs::effect::effect(const std::string& code, const std::string& name)
{
auto gctx = gs::context();
char* error_buffer = nullptr;
gs_effect_t* effect = gs_effect_create(code.c_str(), name.c_str(), &error_buffer);
if (!effect) {
throw error_buffer ? std::runtime_error(error_buffer)
: std::runtime_error("Unknown error during effect compile.");
}
reset(effect, [](gs_effect_t* ptr) { gs_effect_destroy(ptr); });
}
gs::effect::effect(std::filesystem::path file) : effect(load_file_as_code(file), file.string()) {}
gs::effect::~effect()
{
auto gctx = gs::context();
reset();
}
size_t gs::effect::count_techniques()
{
return static_cast<size_t>(get()->techniques.num);
}
gs::effect_technique gs::effect::get_technique(size_t idx)
{
if (idx >= count_techniques()) {
return nullptr;
}
return gs::effect_technique(get()->techniques.array + idx, this);
}
gs::effect_technique gs::effect::get_technique(const std::string& name)
{
for (size_t idx = 0; idx < count_techniques(); idx++) {
auto ptr = get()->techniques.array + idx;
if (strcmp(ptr->name, name.c_str()) == 0) {
return gs::effect_technique(ptr, this);
}
}
return nullptr;
}
bool gs::effect::has_technique(const std::string& name)
{
if (get_technique(name))
return true;
return false;
}
size_t gs::effect::count_parameters()
{
return get()->params.num;
}
gs::effect_parameter gs::effect::get_parameter(size_t idx)
{
if (idx >= count_parameters()) {
throw std::out_of_range("Index is out of range.");
}
return gs::effect_parameter(get()->params.array + idx, this);
}
gs::effect_parameter gs::effect::get_parameter(const std::string& name)
{
for (size_t idx = 0; idx < count_parameters(); idx++) {
auto ptr = get()->params.array + idx;
if (strcmp(ptr->name, name.c_str()) == 0) {
return gs::effect_parameter(ptr, this);
}
}
return nullptr;
}
bool gs::effect::has_parameter(const std::string& name)
{
if (get_parameter(name))
return true;
return false;
}
bool gs::effect::has_parameter(const std::string& name, effect_parameter::type type)
{
auto eprm = get_parameter(name);
if (eprm)
return eprm.get_type() == type;
return false;
}