|
/*
|
|
* Copyright (C) 2021 Christopher J. Howard
|
|
*
|
|
* This file is part of Antkeeper source code.
|
|
*
|
|
* Antkeeper source code 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef ANTKEEPER_SHADER_TEMPLATE_HPP
|
|
#define ANTKEEPER_SHADER_TEMPLATE_HPP
|
|
|
|
#include "gl/shader-object.hpp"
|
|
#include "gl/shader-program.hpp"
|
|
#include <map>
|
|
#include <string>
|
|
#include <unordered_set>
|
|
#include <vector>
|
|
|
|
/**
|
|
* Shader templates can be used to generate multiple shader variants from a single source.
|
|
*
|
|
* Shader templates support the following preprocessor directives:
|
|
*
|
|
* * `#pragma vertex`: Replaced with `#define __VERTEX__` when generating vertex shader objects.
|
|
* * `#pragma fragment`: Replaced with `#define __FRAGMENT__` when generating fragment shader objects.
|
|
* * `#pragma geometry`: Replaced with `#define __GEOMETRY__` when generating geometry shader objects.
|
|
* * `#pragma define <key> <value>`: Will be replaced with `#define <key> <value>` if its definition is passed to the shader template.
|
|
*
|
|
* @see gl::shader_stage
|
|
* @see gl::shader_object
|
|
* @see gl::shader_program
|
|
*/
|
|
class shader_template
|
|
{
|
|
public:
|
|
/// Container of definitions used to replace `#pragma define <key> <value>` directives.
|
|
typedef std::unordered_map<std::string, std::string> dictionary_type;
|
|
|
|
/**
|
|
* Creates a shader template and sets its source code.
|
|
*
|
|
* @param source_code String containing the shader template source code.
|
|
*
|
|
* @see shader_template::source(const std::string&)
|
|
*/
|
|
shader_template(const std::string& source_code);
|
|
|
|
/**
|
|
* Creates a shader template.
|
|
*/
|
|
shader_template();
|
|
|
|
/**
|
|
* Replaces the source code of the shader template.
|
|
*
|
|
* @param source_code String containing shader template source code.
|
|
*/
|
|
void source(const std::string& source_code);
|
|
|
|
/**
|
|
* Configures shader object source code given a shader stage and template dictionary.
|
|
*
|
|
* @param stage Shader stage of the shader object to generate. Instances of `#pragma <stage>` in the template source will be replaced with `#define __<STAGE>__`.
|
|
* @param definitions Container of definitions used to replace `#pragma define <key> <value>` directives.
|
|
* @return Configured shader object source code.
|
|
*/
|
|
std::string configure(gl::shader_stage stage, const dictionary_type& definitions) const;
|
|
|
|
/**
|
|
* Configures and compiles a shader object.
|
|
*
|
|
* @param stage Shader stage of the shader object to generate. Instances of `#pragma <stage>` in the template source will be replaced with `#define __<STAGE>__`.
|
|
* @param definitions Container of definitions used to replace `#pragma define <key> <value>` directives.
|
|
* @return Compiled shader object.
|
|
*
|
|
* @exception std::runtime_error Any exceptions thrown by gl::shader_object.
|
|
*/
|
|
gl::shader_object* compile(gl::shader_stage stage, const dictionary_type& definitions) const;
|
|
|
|
/**
|
|
* Configures and compiles shader objects, then links them into a shader program. Shader object stages are determined according to the presence of `#pragma <stage>` directives.
|
|
*
|
|
* @param definitions Container of definitions used to replace `#pragma define <key> <value>` directives.
|
|
* @return Linked shader program.
|
|
*
|
|
* @exception std::runtime_error Any exceptions thrown by gl::shader_object or gl::shader_program.
|
|
*
|
|
* @see has_vertex_directive() const
|
|
* @see has_fragment_directive() const
|
|
* @see has_geometry_directive() const
|
|
*/
|
|
gl::shader_program* build(const dictionary_type& definitions) const;
|
|
|
|
/// Returns `true` if the template source contains one or more `#pragma vertex` directive.
|
|
bool has_vertex_directive() const;
|
|
|
|
/// Returns `true` if the template source contains one or more `#pragma fragment` directive.
|
|
bool has_fragment_directive() const;
|
|
|
|
/// Returns `true` if the template source contains one or more `#pragma geometry` directive.
|
|
bool has_geometry_directive() const;
|
|
|
|
/**
|
|
* Returns `true` if the template source contains one or more instance of `#pragma define <key>`.
|
|
*
|
|
* @param key Definition key.
|
|
*/
|
|
bool has_define_directive(const std::string& key) const;
|
|
|
|
private:
|
|
void replace_stage_directives(gl::shader_stage stage) const;
|
|
void replace_define_directives(const dictionary_type& definitions) const;
|
|
|
|
mutable std::vector<std::string> template_source;
|
|
std::unordered_set<std::size_t> vertex_directives;
|
|
std::unordered_set<std::size_t> fragment_directives;
|
|
std::unordered_set<std::size_t> geometry_directives;
|
|
std::multimap<std::string, std::size_t> define_directives;
|
|
};
|
|
|
|
#endif // ANTKEEPER_SHADER_TEMPLATE_HPP
|