obs-StreamFX/source/obs/gs/gs-effect.cpp

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/*
* 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 <sstream>
#include <stdexcept>
#include <vector>
#include "obs/gs/gs-helper.hpp"
#include "util/util-platform.hpp"
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#define MAX_EFFECT_SIZE 32 * 1024 * 1024 // 32 MiB, big enough for everything.
static std::string load_file_as_code(std::filesystem::path shader_file, bool is_top_level = true)
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{
std::stringstream shader_stream;
std::filesystem::path shader_path = std::filesystem::absolute(shader_file);
std::filesystem::path shader_root = std::filesystem::path(shader_path).remove_filename();
// Ensure it meets size limits.
uintmax_t size = std::filesystem::file_size(shader_path);
if (size > MAX_EFFECT_SIZE) {
throw std::runtime_error("File is too large to be loaded.");
}
// Try to open as-is.
std::ifstream ifs(shader_path, std::ios::in);
if (!ifs.is_open() || ifs.bad()) {
throw std::runtime_error("Failed to open file.");
}
// Push Graphics API to shader.
if (is_top_level) {
auto gctx = streamfx::obs::gs::context();
switch (gs_get_device_type()) {
case GS_DEVICE_DIRECT3D_11:
shader_stream << "#define GS_DEVICE_DIRECT3D_11" << std::endl;
shader_stream << "#define GS_DEVICE_DIRECT3D" << std::endl;
break;
case GS_DEVICE_OPENGL:
shader_stream << "#define GS_DEVICE_OPENGL" << std::endl;
break;
}
}
// Pre-process the shader.
std::string line;
while (std::getline(ifs, line)) {
std::string line_trimmed = line;
{ // Figure out the length of the trim.
size_t trim_length = 0;
for (size_t idx = 0, edx = line_trimmed.length(); idx < edx; idx++) {
char ch = line_trimmed.at(idx);
if ((ch != ' ') && (ch != '\t')) {
trim_length = idx;
break;
}
}
if (trim_length > 0) {
line_trimmed.erase(0, trim_length);
}
}
// Handle '#include'
if (line_trimmed.substr(0, 8) == "#include") {
std::string include_str = line_trimmed.substr(10, line_trimmed.size() - 11); // '#include "'
std::filesystem::path include_path = include_str;
if (!include_path.is_absolute()) {
include_path = shader_root / include_str;
}
line = load_file_as_code(include_path, false);
}
shader_stream << line << std::endl;
}
return shader_stream.str();
}
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streamfx::obs::gs::effect::effect(const std::string& code, const std::string& name)
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{
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auto gctx = streamfx::obs::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); });
}
streamfx::obs::gs::effect::effect(std::filesystem::path file)
: effect(load_file_as_code(file),
streamfx::util::platform::utf8_to_native(std::filesystem::absolute(file)).generic_u8string())
{}
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streamfx::obs::gs::effect::~effect()
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{
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auto gctx = streamfx::obs::gs::context();
reset();
}
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std::size_t streamfx::obs::gs::effect::count_techniques()
{
return static_cast<size_t>(get()->techniques.num);
}
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streamfx::obs::gs::effect_technique streamfx::obs::gs::effect::get_technique(std::size_t idx)
{
if (idx >= count_techniques()) {
return nullptr;
}
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return streamfx::obs::gs::effect_technique(get()->techniques.array + idx, *this);
}
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streamfx::obs::gs::effect_technique streamfx::obs::gs::effect::get_technique(const std::string& name)
{
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for (std::size_t idx = 0; idx < count_techniques(); idx++) {
auto ptr = get()->techniques.array + idx;
if (strcmp(ptr->name, name.c_str()) == 0) {
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return streamfx::obs::gs::effect_technique(ptr, *this);
}
}
return nullptr;
}
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bool streamfx::obs::gs::effect::has_technique(const std::string& name)
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{
if (get_technique(name))
return true;
return false;
}
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std::size_t streamfx::obs::gs::effect::count_parameters()
{
return get()->params.num;
}
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streamfx::obs::gs::effect_parameter streamfx::obs::gs::effect::get_parameter(std::size_t idx)
{
if (idx >= count_parameters()) {
throw std::out_of_range("Index is out of range.");
}
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return streamfx::obs::gs::effect_parameter(get()->params.array + idx, *this);
}
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streamfx::obs::gs::effect_parameter streamfx::obs::gs::effect::get_parameter(const std::string& name)
{
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for (std::size_t idx = 0; idx < count_parameters(); idx++) {
auto ptr = get()->params.array + idx;
if (strcmp(ptr->name, name.c_str()) == 0) {
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return streamfx::obs::gs::effect_parameter(ptr, *this);
}
}
return nullptr;
}
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bool streamfx::obs::gs::effect::has_parameter(const std::string& name)
{
if (get_parameter(name))
return true;
return false;
}
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bool streamfx::obs::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;
}