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#include "ShaderLoader.hpp"
#include <format>
#include <hyprutils/memory/Casts.hpp>
#include <hyprutils/memory/UniquePtr.hpp>
#include <hyprutils/string/String.hpp>
#include <hyprutils/path/Path.hpp>
#include "../debug/log/Logger.hpp"
#include "shaders/Shaders.hpp"
#include "../helpers/fs/FsUtils.hpp"
#include "Renderer.hpp"
#include <glslang/Public/resource_limits_c.h>
#include <string>
#include <filesystem>
using namespace Render;
using namespace Render;
CShaderLoader::CShaderLoader(const std::vector<std::string> includes, const std::array<std::string, SH_FRAG_LAST>& frags, const std::string shaderPath) : m_shaderPath(shaderPath) {
m_callbacks = glsl_include_callbacks_t{
.include_local =
[](void* ctx, const char* header_name, const char* includer_name, size_t include_depth) {
auto shaderLoader = sc<CShaderLoader*>(ctx);
auto res = new glsl_include_result_t;
if (shaderLoader->m_overrideDefines.length() && std::string{header_name} == "defines.h") {
res->header_name = header_name;
res->header_data = shaderLoader->m_overrideDefines.c_str();
res->header_length = shaderLoader->m_overrideDefines.length();
} else if (shaderLoader->includes().contains(header_name)) {
res->header_name = header_name;
res->header_data = shaderLoader->includes().at(header_name).c_str();
res->header_length = shaderLoader->includes().at(header_name).length();
} else {
res->header_name = nullptr;
res->header_data = nullptr;
res->header_length = 0;
}
shaderLoader->m_includeResults.push_back(res);
return res;
},
.free_include_result =
[](void* ctx, glsl_include_result_t* result) {
auto shaderLoader = sc<CShaderLoader*>(ctx);
std::erase(shaderLoader->m_includeResults, result);
delete result;
return 0;
},
};
for (const auto& inc : includes) {
include(inc);
}
std::ranges::transform(frags, m_fragFiles.begin(), [&](const auto& filename) { return loadShader(filename); });
}
CShaderLoader::~CShaderLoader() {
// glslFreeIncludeResult should leave it empty by this point
for (const auto& res : m_includeResults) {
delete res;
}
}
void CShaderLoader::include(const std::string& filename) {
m_includes.insert({filename, loadShader(filename)});
}
std::string CShaderLoader::getDefines(ShaderFeatureFlags features) {
std::string res = "";
std::map<std::string, std::string> defines = {
{"USE_RGBA", features & SH_FEAT_RGBA ? "1" : "0"}, {"USE_DISCARD", features & SH_FEAT_DISCARD ? "1" : "0"}, {"USE_TINT", features & SH_FEAT_TINT ? "1" : "0"},
{"USE_ROUNDING", features & SH_FEAT_ROUNDING ? "1" : "0"}, {"USE_CM", features & SH_FEAT_CM ? "1" : "0"}, {"USE_TONEMAP", features & SH_FEAT_TONEMAP ? "1" : "0"},
{"USE_SDR_MOD", features & SH_FEAT_SDR_MOD ? "1" : "0"}, {"USE_BLUR", features & SH_FEAT_BLUR ? "1" : "0"}, {"USE_ICC", features & SH_FEAT_ICC ? "1" : "0"},
};
for (const auto& [name, value] : defines) {
res += std::format("#define {} {}\n", name, value);
}
return res;
}
std::string CShaderLoader::processSource(const std::string& source, glslang_stage_t stage) {
const glslang_input_t input = {
.language = GLSLANG_SOURCE_GLSL,
.stage = stage,
.client = GLSLANG_CLIENT_NONE,
.target_language = GLSLANG_TARGET_NONE,
.code = source.c_str(),
.default_version = 100,
.default_profile = GLSLANG_NO_PROFILE,
.force_default_version_and_profile = false,
.forward_compatible = false,
.messages = GLSLANG_MSG_DEFAULT_BIT,
.resource = glslang_default_resource(),
.callbacks = m_callbacks,
.callbacks_ctx = this,
};
glslang_shader_t* shader = glslang_shader_create(&input);
if (!glslang_shader_preprocess(shader, &input)) {
Log::logger->log(Log::ERR, "GLSL preprocessing failed");
Log::logger->log(Log::ERR, "{}", glslang_shader_get_info_log(shader));
Log::logger->log(Log::ERR, "{}", glslang_shader_get_info_debug_log(shader));
Log::logger->log(Log::ERR, "{}", input.code);
glslang_shader_delete(shader);
return source;
}
std::stringstream stream(glslang_shader_get_preprocessed_code(shader));
std::string code = "";
std::string line;
while (std::getline(stream, line)) {
if (!line.starts_with("#line "))
code += line + "\n";
}
glslang_shader_delete(shader);
return code;
}
std::string CShaderLoader::process(const std::string& filename) {
auto source = loadShader(filename);
return processSource(source, filename.ends_with(".vert") ? GLSLANG_STAGE_VERTEX : GLSLANG_STAGE_FRAGMENT);
}
std::string CShaderLoader::process(const std::string& filename, const std::map<std::string, std::string>& defines) {
m_overrideDefines = "";
for (const auto& [name, value] : defines) {
m_overrideDefines += std::format("#define {} {}\n", name, value);
}
const auto& res = process(filename);
m_overrideDefines = "";
return res;
}
std::string CShaderLoader::getVariantSource(ePreparedFragmentShader frag, ShaderFeatureFlags features) {
static const auto PCM = CConfigValue<Hyprlang::INT>("render:cm_enabled");
if (!*PCM)
features &= ~(SH_FEAT_CM | SH_FEAT_TONEMAP | SH_FEAT_SDR_MOD);
if (!m_fragVariants[frag].contains(features)) {
ASSERT(m_fragFiles[frag].length());
m_overrideDefines = getDefines(features);
m_fragVariants[frag][features] = processSource(m_fragFiles[frag]);
m_overrideDefines = "";
}
return m_fragVariants[frag][features];
}
const std::map<std::string, std::string>& CShaderLoader::includes() {
return m_includes;
}
// TODO notify user if bundled shader is newer than ~/.config override
std::string CShaderLoader::loadShader(const std::string& filename) {
if (m_shaderPath.length()) {
std::filesystem::path path = m_shaderPath;
const auto src = NFsUtils::readFileAsString(path / filename);
if (src.has_value())
return src.value();
}
const auto home = Hyprutils::Path::getHome();
if (home.has_value()) {
const auto src = NFsUtils::readFileAsString(home.value() + "/hypr/shaders/" + filename);
if (src.has_value())
return src.value();
}
for (auto& e : ASSET_PATHS) {
const auto src = NFsUtils::readFileAsString(std::string{e} + "/hypr/shaders/" + filename);
if (src.has_value())
return src.value();
}
if (SHADERS.contains(filename))
return SHADERS.at(filename);
throw std::runtime_error(std::format("Couldn't load shader {}", filename));
}
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