OpenGL-3D-Engine/shaderClass.cpp at master · Gareasm/OpenGL-3D-Engine · GitHub

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#include "shaderClass.h"

std::string get_file_contents(const char* filename){
	std::ifstream in(filename, std::ios::binary);
	if (in)
	{
		std::string contents;
		in.seekg(0, std::ios::end);
		contents.resize(in.tellg());
		in.seekg(0, std::ios::beg);
		in.read(&contents[0], contents.size());
		in.close();
		return(contents);
	}
	throw(errno);
}

Shader::Shader(const char* vertexFile, const char* fragmentFile) {
	std::string vertexCode = get_file_contents(vertexFile);
	std::string fragmentCode = get_file_contents(fragmentFile);
	// Convert the shader source strings into character arrays
	const char* vertexSource = vertexCode.c_str();
	const char* fragmentSource = fragmentCode.c_str();

	GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vertexShader, 1, &vertexSource, NULL);
	glCompileShader(vertexShader);
	compileErrors(vertexShader, "VERTEX");

	GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
	glCompileShader(fragmentShader);
	compileErrors(fragmentShader, "FRAGMENT");

	ID = glCreateProgram();
	glAttachShader(ID, vertexShader);
	glAttachShader(ID, fragmentShader);
	glLinkProgram(ID);
	compileErrors(ID, "PROGRAM");

	glDeleteShader(vertexShader);
	glDeleteShader(fragmentShader);
}

// Activates the Shader Program
void Shader::Activate(){
	glUseProgram(ID);
}

// Deletes the Shader Program
void Shader::Delete(){
	glDeleteProgram(ID);
}

void Shader::compileErrors(unsigned int shader, const char* type)
{
	// Stores status of compilation
	GLint hasCompiled;
	// Character array to store error message in
	char infoLog[1024];
	if (type != "PROGRAM")
	{
		glGetShaderiv(shader, GL_COMPILE_STATUS, &hasCompiled);
		if (hasCompiled == GL_FALSE)
		{
			glGetShaderInfoLog(shader, 1024, NULL, infoLog);
			std::cout << "SHADER_COMPILATION_ERROR for:" << type << "\n" << infoLog << std::endl;
		}
	}
	else
	{
		glGetProgramiv(shader, GL_LINK_STATUS, &hasCompiled);
		if (hasCompiled == GL_FALSE)
		{
			glGetProgramInfoLog(shader, 1024, NULL, infoLog);
			std::cout << "SHADER_LINKING_ERROR for:" << type << "\n" << infoLog << std::endl;
		}
	}
}
void Shader::setBool(const std::string& name, bool value)
{
	glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
}
// ------------------------------------------------------------------------
void Shader::setInt(const std::string& name, int value)
{
	glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void Shader::setFloat(const std::string& name, float value)
{
	glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void Shader::setVec2(const std::string& name, const glm::vec2& value)
{
	glUniform2fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void Shader::setVec2(const std::string& name, float x, float y)
{
	glUniform2f(glGetUniformLocation(ID, name.c_str()), x, y);
}
// ------------------------------------------------------------------------
void Shader::setVec3(const std::string& name, const glm::vec3& value)
{
	glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void Shader::setVec3(const std::string& name, float x, float y, float z)
{
	glUniform3f(glGetUniformLocation(ID, name.c_str()), x, y, z);
}
// ------------------------------------------------------------------------
void Shader::setVec4(const std::string& name, const glm::vec4& value)
{
	glUniform4fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void Shader::setVec4(const std::string& name, float x, float y, float z, float w)
{
	glUniform4f(glGetUniformLocation(ID, name.c_str()), x, y, z, w);
}
// ------------------------------------------------------------------------
void Shader::setMat2(const std::string& name, const glm::mat2& mat)
{
	glUniformMatrix2fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
// ------------------------------------------------------------------------
void Shader::setMat3(const std::string& name, const glm::mat3& mat)
{
	glUniformMatrix3fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
// ------------------------------------------------------------------------
void Shader::setMat4(const std::string& name, const glm::mat4& mat)
{
	glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}