shader.cpp

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/* This file is part of BlosSOM.
 *
 * Copyright (C) 2021 Sona Molnarova
 *
 * BlosSOM 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.
 *
 * BlosSOM 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
 * BlosSOM. If not, see <https://www.gnu.org/licenses/>.
 */
 
#include "shader.h"
 
#include <glm/gtc/type_ptr.hpp>
#include <iostream>
 
Shader::Shader() {}
 
void
Shader::build(const std::string &vs, const std::string &fs)
{
    // compile shaders
    unsigned int vertex, fragment;
    int success;
    char infoLog[512];
    // vertex Shader
    vertex = glCreateShader(GL_VERTEX_SHADER);
    const char *vsc = vs.c_str();
    glShaderSource(vertex, 1, &vsc, NULL);
    glCompileShader(vertex);
    // print compile errors if any
    glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
    if (!success) {
        glGetShaderInfoLog(vertex, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n"
                  << infoLog << std::endl;
    };
 
    // fragment Shader
    fragment = glCreateShader(GL_FRAGMENT_SHADER);
    const char *fsc = fs.c_str();
    glShaderSource(fragment, 1, &fsc, NULL);
    glCompileShader(fragment);
    // print compile errors if any
    glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
    if (!success) {
        glGetShaderInfoLog(fragment, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n"
                  << infoLog << std::endl;
    };
 
    // shader Program
    ID = glCreateProgram();
    glAttachShader(ID, vertex);
    glAttachShader(ID, fragment);
    glLinkProgram(ID);
    // print linking errors if any
    glGetProgramiv(ID, GL_LINK_STATUS, &success);
    if (!success) {
        glGetProgramInfoLog(ID, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n"
                  << infoLog << std::endl;
    }
 
    // delete the shaders as they're linked into our program now and no longer
    // necessary
    glDeleteShader(vertex);
    glDeleteShader(fragment);
}
 
void
Shader::use()
{
    glUseProgram(ID);
}
 
void
Shader::set_bool(const std::string &name, bool value) const
{
    glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
}
 
void
Shader::set_int(const std::string &name, int value) const
{
    glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
}
 
void
Shader::set_float(const std::string &name, float value) const
{
    glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
}
 
void
Shader::set_mat4(const std::string &name, glm::mat4 value) const
{
    glUniformMatrix4fv(
      glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &value[0][0]);
}