Shader Class Reference

#include <Shader.h>

Collaboration diagram for Shader:

Public Member Functions
	Shader (const std::string &filepath)
	~Shader ()
void	Bind () const
void	Unbind () const
void	SetUniform1i (const std::string &name, int value)
void	SetUniform4f (const std::string &name, float v0, float v1, float f2, float f3)
void	SetUniform1f (const std::string &name, float value)
void	SetUniformMat4f (const std::string &name, glm::mat4 &matrix)
void	SetUniform2f (const std::string &name, float v0, float v1)

Private Member Functions
ShaderProgramSource	ParseShader (const std::string &filepath)
unsigned int	CompileShader (unsigned int type, const std::string &source)
unsigned int	CreateShader (const std::string &verxterShader, const std::string &fragmentShader)
int	GetUniformLocation (const std::string &name)

Private Attributes
unsigned int	m_RendererID
std::string	m_FilePath
std::unordered_map< std::string, int >	m_UniformLocationCache

Detailed Description

Definition at line 15 of file Shader.h.

Constructor & Destructor Documentation

Shader()

Shader::Shader

(

const std::string &

filepath

)

Definition at line 4 of file Shader.cpp.

                                        :
    m_FilePath(filepath), m_RendererID(0)
{
    ShaderProgramSource source = ParseShader(filepath);
    m_RendererID = CreateShader(source.VertexSource, source.FragmentSource);
}

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~Shader()

Shader::~Shader

(

)

Definition at line 11 of file Shader.cpp.

{
    GLCall(glDeleteProgram(m_RendererID));
}

Member Function Documentation

Bind()

void Shader::Bind

(

)

const

Definition at line 16 of file Shader.cpp.

{
    GLCall(glUseProgram(m_RendererID));
}

CompileShader()

unsigned int Shader::CompileShader ( unsigned int type, const std::string & source )

private

Definition at line 70 of file Shader.cpp.

{
    unsigned int id = glCreateShader(type);
    const char* src = source.c_str();
    GLCall(glShaderSource(id, 1, &src, nullptr));
    GLCall(glCompileShader(id));
 
    int result;
    GLCall(glGetShaderiv(id, GL_COMPILE_STATUS, &result));
 
    if (result == GL_FALSE)
    {
        int length;
        GLCall(glGetShaderiv(id, GL_INFO_LOG_LENGTH, &length));
        char* message = (char*)alloca(length * sizeof(char));
        GLCall(glGetShaderInfoLog(id, length, &length, message));
        std::cout << "Failed to compile " << (type == GL_VERTEX_SHADER ? "vertex" : "fragment") << " shader" << std::endl;
        std::cout << message << std::endl;
 
        GLCall(glDeleteShader(id));
        return 0;
    }
 
    return id;
}

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CreateShader()

unsigned int Shader::CreateShader ( const std::string & verxterShader, const std::string & fragmentShader )

private

Definition at line 96 of file Shader.cpp.

{
    unsigned int program = glCreateProgram();
    unsigned int vs = CompileShader(GL_VERTEX_SHADER, verxterShader);
    unsigned int fs = CompileShader(GL_FRAGMENT_SHADER, fragmentShader);
 
    GLCall(glAttachShader(program, vs));
    GLCall(glAttachShader(program, fs));
 
    GLCall(glLinkProgram(program));
    GLCall(glValidateProgram(program));
 
    GLCall(glDeleteShader(vs));
    GLCall(glDeleteShader(fs));
 
    return program;
}

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GetUniformLocation()

int Shader::GetUniformLocation ( const std::string & name )

private

Definition at line 139 of file Shader.cpp.

{
    if (m_UniformLocationCache.find(name) != m_UniformLocationCache.end())
    {
        return m_UniformLocationCache[name];
    }
    GLCall(int location = glGetUniformLocation(m_RendererID, name.c_str()));
    if (location == -1)
        std::cout << "Warning: uniform '" << name << "' doesn't exist!!" << std::endl;
 
    m_UniformLocationCache[name] = location;
 
    return location;
}

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ParseShader()

ShaderProgramSource Shader::ParseShader ( const std::string & filepath )

private

Definition at line 26 of file Shader.cpp.

{
    std::ifstream stream(filepath);
 
    enum class ShaderType
    {
        NONE = -1,
        VERTEX = 0,
        FRAGMENT = 1
    };
 
    std::string line;
    std::stringstream ss[2];
    ShaderType type = ShaderType::NONE;
    if (stream.is_open())
    {
        while (getline(stream, line))
        {
            if (line.find("#shader") != std::string::npos)
            {
                if (line.find("vertex") != std::string::npos)
                {
                    type = ShaderType::VERTEX;
                }
                else if (line.find("fragment") != std::string::npos)
                {
                    type = ShaderType::FRAGMENT;
                }
            }
            else
            {
                ss[(int)type] << line << '\n';
            }
        }
 
        return {ss[0].str(), ss[1].str()};
    }
    else
    {
        std::cout << "No Shaders File Found!!!" << std::endl;
        throw "No Shaders File Found!!!";
    }
}

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SetUniform1f()

void Shader::SetUniform1f	(	const std::string &	name,
		float	value )

Definition at line 129 of file Shader.cpp.

{
    GLCall(glUniform1f(GetUniformLocation(name), value));
}

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SetUniform1i()

void Shader::SetUniform1i	(	const std::string &	name,
		int	value )

Definition at line 114 of file Shader.cpp.

{
    GLCall(glUniform1i(GetUniformLocation(name), value));
}

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SetUniform2f()

void Shader::SetUniform2f	(	const std::string &	name,
		float	v0,
		float	v1 )

Definition at line 124 of file Shader.cpp.

{
    GLCall(glUniform2f(GetUniformLocation(name), v0, v1));
}

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SetUniform4f()

void Shader::SetUniform4f	(	const std::string &	name,
		float	v0,
		float	v1,
		float	f2,
		float	f3 )

Definition at line 119 of file Shader.cpp.

{
    GLCall(glUniform4f(GetUniformLocation(name), v0, v1, v2, v3));
}

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SetUniformMat4f()

void Shader::SetUniformMat4f	(	const std::string &	name,
		glm::mat4 &	matrix )

Definition at line 134 of file Shader.cpp.

{
    GLCall(glUniformMatrix4fv(GetUniformLocation(name), 1, GL_FALSE, &matrix[0][0]));
}

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Unbind()

void Shader::Unbind

(

)

const

Definition at line 21 of file Shader.cpp.

{
    GLCall(glUseProgram(0));
}

Member Data Documentation

m_FilePath

std::string Shader::m_FilePath

private

Definition at line 19 of file Shader.h.

m_RendererID

unsigned int Shader::m_RendererID

private

Definition at line 18 of file Shader.h.

m_UniformLocationCache

std::unordered_map<std::string, int> Shader::m_UniformLocationCache

private

Definition at line 20 of file Shader.h.

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The documentation for this class was generated from the following files:

• include/renderer/Shader.h
• src/renderer/Shader.cpp