mirror of
https://github.com/MaSzyna-EU07/maszyna.git
synced 2026-10-17 13:19:20 +02:00
342 lines
9.9 KiB
C++
342 lines
9.9 KiB
C++
#include "stdafx.h"
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#include <fstream>
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#include <sstream>
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#include <cstring>
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#include "shader.h"
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#include "glsl_common.h"
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#include "utilities/Logs.h"
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inline bool strcend(std::string_view value, std::string_view ending)
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{
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if (ending.size() > value.size())
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return false;
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return std::equal(ending.rbegin(), ending.rend(), value.rbegin());
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}
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std::string gl::shader::read_file(const std::string &filename) const
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{
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std::stringstream stream;
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std::ifstream f;
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f.open(filename);
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stream << f.rdbuf();
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f.close();
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std::string str = stream.str();
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if (str.empty())
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throw shader_exception("cannot read shader: " + filename);
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return str;
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}
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void gl::shader::expand_includes(std::string &str, const std::string &basedir)
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{
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size_t start_pos = 0;
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std::string magic = "#include";
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while ((start_pos = str.find(magic, start_pos)) != std::string::npos)
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{
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size_t fp = str.find('<', start_pos);
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size_t fe = str.find('>', start_pos);
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if (fp == std::string::npos || fe == std::string::npos)
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return;
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std::string filename = str.substr(fp + 1, fe - fp - 1);
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std::string content;
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if (filename != "common")
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content = read_file(basedir + filename);
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else
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content = glsl_common;
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str.replace(start_pos, fe - start_pos + 1, content);
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}
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}
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std::unordered_map<std::string, gl::shader::components_e> gl::shader::components_mapping =
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{
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{ "R", components_e::R },
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{ "RG", components_e::RG },
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{ "RGB", components_e::RGB },
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{ "RGBA", components_e::RGBA },
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{ "sRGB", components_e::sRGB },
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{ "sRGB_A", components_e::sRGB_A }
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};
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std::unordered_map<std::string, gl::shader::defaultparam_e> gl::shader::defaultparams_mapping =
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{
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{ "required", defaultparam_e::required },
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{ "nan", defaultparam_e::nan },
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{ "zero", defaultparam_e::zero },
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{ "one", defaultparam_e::one },
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{ "ambient", defaultparam_e::ambient },
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{ "diffuse", defaultparam_e::diffuse },
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{ "specular", defaultparam_e::specular },
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{ "glossiness", defaultparam_e::glossiness }
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};
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std::pair<GLuint, std::string> gl::shader::process_source(const std::string &filename, const std::string &basedir)
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{
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std::string str;
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GLuint type;
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if (strcend(filename, ".vert"))
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type = GL_VERTEX_SHADER;
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else if (strcend(filename, ".frag"))
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type = GL_FRAGMENT_SHADER;
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else if (strcend(filename, ".geom"))
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type = GL_GEOMETRY_SHADER;
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else if (strcend(filename, ".comp"))
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type = GL_COMPUTE_SHADER;
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else
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throw shader_exception("unknown shader " + filename);
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str += "#version 460 core\n";
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// expose the shader stage to glsl_common so vertex-only built-ins
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// (gl_InstanceID, effective_modelview, etc.) can be guarded out of
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// fragment/geometry compilations.
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if (type == GL_VERTEX_SHADER) str += "#define STAGE_VERTEX 1\n";
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else if (type == GL_FRAGMENT_SHADER) str += "#define STAGE_FRAGMENT 1\n";
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else if (type == GL_GEOMETRY_SHADER) str += "#define STAGE_GEOMETRY 1\n";
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else if (type == GL_COMPUTE_SHADER) str += "#define STAGE_COMPUTE 1\n";
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str += "vec4 FBOUT(vec4 x) { return " + (Global.gfx_shadergamma ? std::string("vec4(pow(x.rgb, vec3(1.0 / 2.2)), x.a)") : std::string("x")) + "; }\n";
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str += read_file(basedir + filename);
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expand_includes(str, basedir);
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parse_texture_entries(str);
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parse_param_entries(str);
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return std::make_pair(type, str);
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}
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void gl::shader::parse_texture_entries(std::string &str)
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{
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size_t start_pos = 0;
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std::string magic = "#texture";
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while ((start_pos = str.find(magic, start_pos)) != std::string::npos)
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{
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size_t fp = str.find('(', start_pos);
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size_t fe = str.find(')', start_pos);
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if (fp == std::string::npos || fe == std::string::npos)
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return;
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std::istringstream ss(str.substr(fp + 1, fe - fp - 1));
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std::string token;
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std::string uniformname;
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texture_entry conf;
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size_t arg = 0;
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while (std::getline(ss, token, ','))
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{
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std::istringstream token_ss(token);
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if (arg == 0)
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token_ss >> uniformname;
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else if (arg == 1)
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token_ss >> conf.id;
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else if (arg == 2)
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{
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std::string comp;
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token_ss >> comp;
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if (!components_mapping.contains(comp))
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log_error("unknown components: " + comp);
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else
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conf.components = components_mapping[comp];
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}
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arg++;
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}
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if (arg == 3)
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{
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if (uniformname.empty())
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log_error("empty name");
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else if (conf.id >= gl::MAX_TEXTURES)
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log_error("invalid texture binding: " + std::to_string(conf.id));
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else
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texture_conf.try_emplace(uniformname, conf);
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}
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else
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log_error("invalid argument count to #texture");
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str.erase(start_pos, fe - start_pos + 1);
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}
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}
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void gl::shader::parse_param_entries(std::string &str)
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{
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size_t start_pos = 0;
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std::string magic = "#param";
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while ((start_pos = str.find(magic, start_pos)) != std::string::npos)
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{
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size_t fp = str.find('(', start_pos);
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size_t fe = str.find(')', start_pos);
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if (fp == std::string::npos || fe == std::string::npos)
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return;
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std::istringstream ss(str.substr(fp + 1, fe - fp - 1));
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std::string token;
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std::string uniformname;
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param_entry conf;
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size_t arg = 0;
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while (std::getline(ss, token, ','))
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{
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std::istringstream token_ss(token);
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if (arg == 0)
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token_ss >> uniformname;
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else if (arg == 1)
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token_ss >> conf.location;
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else if (arg == 2)
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token_ss >> conf.offset;
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else if (arg == 3)
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token_ss >> conf.size;
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else if (arg == 4)
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{
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std::string tok;
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token_ss >> tok;
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if (!defaultparams_mapping.contains(tok))
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log_error("unknown param default: " + tok);
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conf.defaultparam = defaultparams_mapping[tok];
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}
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arg++;
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}
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if (arg == 5)
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{
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if (uniformname.empty())
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log_error("empty name");
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else if (conf.location >= gl::MAX_PARAMS)
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log_error("invalid param binding: " + std::to_string(conf.location));
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else if (conf.offset > 3)
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log_error("invalid offset: " + std::to_string(conf.offset));
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else if (conf.offset + conf.size > 4)
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log_error("invalid size: " + std::to_string(conf.size));
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else
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param_conf.try_emplace(uniformname, conf);
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}
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else
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log_error("invalid argument count to #param");
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str.erase(start_pos, fe - start_pos + 1);
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}
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}
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void gl::shader::log_error(const std::string &str) const
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{
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ErrorLog("bad shader: " + name + ": " + str, logtype::shader);
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}
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gl::shader::shader(const std::string &filename) : name(filename)
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{
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auto [shadertype, shadersource] = process_source(filename, "shaders/");
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const GLchar *cstr = shadersource.c_str();
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**this = glCreateShader(shadertype);
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glShaderSource(*this, 1, &cstr, nullptr);
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glCompileShader(*this);
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GLint status;
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glGetShaderiv(*this, GL_COMPILE_STATUS, &status);
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if (!status)
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{
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std::array<GLchar, 512> info{};
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glGetShaderInfoLog(*this, static_cast<GLsizei>(info.size()), nullptr, info.data());
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log_error(std::string(info.data()));
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throw shader_exception("failed to compile " + filename + ": " + std::string(info.data()));
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}
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}
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gl::shader::~shader()
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{
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#ifndef SHADERVALIDATOR_STANDALONE
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glDeleteShader(*this);
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#endif
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}
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void gl::program::init()
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{
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bind();
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for (auto const &[texturename, textureentry] : texture_conf)
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{
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shader::texture_entry const &e = textureentry;
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GLuint loc = glGetUniformLocation(*this, texturename.c_str());
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glUniform1i(loc, static_cast<GLint>(e.id));
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}
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glUniform1i(glGetUniformLocation(*this, "shadowmap"), gl::SHADOW_TEX);
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glUniform1i(glGetUniformLocation(*this, "envmap"), gl::ENV_TEX);
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glUniform1i(glGetUniformLocation(*this, "headlightmap"), gl::HEADLIGHT_TEX);
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GLuint index;
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if ((index = glGetUniformBlockIndex(*this, "scene_ubo")) != GL_INVALID_INDEX)
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glUniformBlockBinding(*this, index, 0);
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if ((index = glGetUniformBlockIndex(*this, "model_ubo")) != GL_INVALID_INDEX)
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glUniformBlockBinding(*this, index, 1);
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if ((index = glGetUniformBlockIndex(*this, "instance_ubo")) != GL_INVALID_INDEX)
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glUniformBlockBinding(*this, index, 3);
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}
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gl::program::program()
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{
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**this = glCreateProgram();
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}
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gl::program::program(std::vector<std::reference_wrapper<const gl::shader>> const &shaders) : program()
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{
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for (const gl::shader &s : shaders)
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attach(s);
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link();
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}
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void gl::program::attach(const gl::shader &s)
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{
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for (auto [texturename, textureentry] : s.texture_conf)
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texture_conf.try_emplace(texturename, std::move(textureentry));
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for (auto [paramname, paramentry] : s.param_conf)
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param_conf.try_emplace(paramname, std::move(paramentry));
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glAttachShader(*this, *s);
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}
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void gl::program::link()
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{
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glLinkProgram(*this);
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GLint status;
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glGetProgramiv(*this, GL_LINK_STATUS, &status);
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if (!status)
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{
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std::array<GLchar, 512> info{};
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glGetProgramInfoLog(*this, static_cast<GLsizei>(info.size()), nullptr, info.data());
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throw shader_exception("failed to link program: " + std::string(info.data()));
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}
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init();
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}
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gl::program::~program()
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{
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glDeleteProgram(*this);
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}
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void gl::program::bind(GLuint i)
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{
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glUseProgram(i);
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}
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void gl::program::dispatch(GLuint groups_x, GLuint groups_y, GLuint groups_z)
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{
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bind();
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glDispatchCompute(groups_x, groups_y, groups_z);
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}
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