228 lines
8.1 KiB
C++
228 lines
8.1 KiB
C++
/*
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* <Short Description>
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* Copyright (C) 2023 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_WITH_GRAPHICS_SHADER_H
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#define BLT_WITH_GRAPHICS_SHADER_H
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#include <blt/gfx/gl_includes.h>
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#include <unordered_map>
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#include <string>
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#include <blt/math/math.h>
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#include <blt/parse/templating.h>
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#include <optional>
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#include <memory>
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namespace blt::gfx
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{
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class uniform_buffer
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{
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private:
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GLuint uboID = 0;
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size_t size_;
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GLuint location_;
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public:
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explicit uniform_buffer(size_t size, GLuint location = 0);
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uniform_buffer(void* data, size_t size, GLuint location = 0);
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/**
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* Resizes the internal UBO
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* @param newSize new size for the UBO
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*/
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uniform_buffer& resize(size_t newSize);
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/**
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* Uploads data to the UBO. This can be an arbitrary locations and does not need to be the whole UBO.
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*/
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uniform_buffer& upload(void* data, size_t size, size_t offset = 0);
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uniform_buffer& bind();
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inline uniform_buffer& unbind()
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{
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glBindBuffer(GL_UNIFORM_BUFFER, 0);
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return *this;
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}
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~uniform_buffer();
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[[nodiscard]] inline size_t size() const
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{ return size_; }
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[[nodiscard]] inline GLuint location() const
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{ return location_; }
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};
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class shader_base_t
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{
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friend uniform_buffer;
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protected:
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struct IntDefaultedToMinusOne
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{
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GLint i = -1;
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inline explicit operator bool() const
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{ return i != -1; }
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};
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std::unordered_map<std::string, IntDefaultedToMinusOne> uniformVars;
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GLuint programID = 0;
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IntDefaultedToMinusOne getUniformLocation(const std::string& name);
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public:
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const shader_base_t& bind() const
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{
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glUseProgram(programID);
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return *this;
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}
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shader_base_t& bind()
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{
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glUseProgram(programID);
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return *this;
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}
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shader_base_t& unbind()
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{
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glUseProgram(0);
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return *this;
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}
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shader_base_t& setBool(const std::string& name, bool value);
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shader_base_t& setInt(const std::string& name, int value);
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shader_base_t& setFloat(const std::string& name, float value);
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shader_base_t& setMatrix(const std::string& name, blt::mat4x4& matrix);
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// poor solution: TODO
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shader_base_t& setMatrix(const std::string& name, blt::mat4x4&& matrix);
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shader_base_t& setVec2(const std::string& name, const blt::vec2& vec);
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shader_base_t& setVec3(const std::string& name, const blt::vec3& vec);
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shader_base_t& setVec4(const std::string& name, const blt::vec4& vec);
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shader_base_t& setVec4i(const std::string& name, const blt::vec4i& vec);
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shader_base_t& setVec2(const std::string& name, float x, float y);
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shader_base_t& setVec3(const std::string& name, float x, float y, float z);
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shader_base_t& setVec4(const std::string& name, float x, float y, float z, float w);
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};
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/**
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* a basic computer shader class, contains the functions and resources required to use compute shaders!
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*/
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class compute_shader_t : public shader_base_t
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{
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private:
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GLuint shaderID = 0;
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public:
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explicit compute_shader_t(const std::string& shader_source, bool loadAsString = true);
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void execute(const int x, const int y, const int z) const
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{
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bind();
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glDispatchCompute(x, y, z);
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}
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~compute_shader_t();
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};
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class shader_t : public shader_base_t
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{
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private:
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GLuint vertexShaderID = 0;
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GLuint fragmentShaderID = 0;
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static unsigned int createShader(const std::string& source, int type);
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static std::string loadShader(std::string_view file);
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shader_t(std::string_view vertex, std::string_view fragment);
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static std::pair<std::string, std::string> process_templates(template_engine_t& engine, std::string_view vertex,
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std::string_view fragment);
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public:
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/**
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* Creates a shader from source file
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* @param vertex vertex shader source
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* @param fragment fragment shader source
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*/
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static shader_t* make(std::optional<std::reference_wrapper<template_engine_t>> engine, std::string_view vertex,
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std::string_view fragment);
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static shader_t* make(std::string_view vertex, std::string_view fragment)
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{
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return make({}, vertex, fragment);
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}
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static std::unique_ptr<shader_t> make_unique(std::optional<std::reference_wrapper<template_engine_t>> engine,
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std::string_view vertex, std::string_view fragment);
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static std::unique_ptr<shader_t> make_unique(std::string_view vertex, std::string_view fragment)
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{
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return make_unique({}, vertex, fragment);
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}
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/**
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* Creates a shader by loading lines of source from the file.
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* @param vertex vertex shader file path
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* @param fragment fragment shader file path
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*/
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static shader_t* load(std::optional<std::reference_wrapper<template_engine_t>> engine, std::string_view vertex,
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std::string_view fragment);
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static shader_t* load(std::string_view vertex, std::string_view fragment)
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{
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return load({}, vertex, fragment);
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}
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static std::unique_ptr<shader_t> load_unique(std::optional<std::reference_wrapper<template_engine_t>> engine,
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std::string_view vertex, std::string_view fragment);
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static std::unique_ptr<shader_t> load_unique(std::string_view vertex, std::string_view fragment)
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{
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return load_unique({}, vertex, fragment);
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}
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shader_t(shader_t&& move) noexcept;
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shader_t(const shader_t& copy) = delete;
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// used to set the location of VAOs to the in variables in opengl shaders.
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void bindAttribute(int attribute, const std::string& name) const;
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// used to set location of shared UBOs like the perspective and view matrix
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void setUniformBlockLocation(const std::string& name, int location) const;
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~shader_t();
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};
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}
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#endif //BLT_WITH_GRAPHICS_SHADER_H
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