ShaderProgram.cpp

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#include "graphics/ShaderProgram.h"
#include "graphics/Texture.h"
#include <glm/gtc/type_ptr.hpp>
 
namespace eng
{
    ShaderProgram::ShaderProgram(GLuint shaderProgramID) : m_shaderProgramID(shaderProgramID)
    {
    }
 
    ShaderProgram::~ShaderProgram()
    {
        glDeleteProgram(m_shaderProgramID);
    }
 
    void ShaderProgram::Bind()
    {
        glUseProgram(m_shaderProgramID);
        m_currentTextureUnit = 0;
    }
 
    GLint ShaderProgram::GetUniformLocation(const std::string& name)
    {
        auto it = m_uniformLocationCache.find(name);
        if (it != m_uniformLocationCache.end())
        {
            return it->second;
        }
        GLint location = glGetUniformLocation(m_shaderProgramID, name.c_str());
        m_uniformLocationCache[name] = location;
        return location;
    }
 
    void ShaderProgram::SetUniform(const std::string& name, float value)
    {
        auto location = GetUniformLocation(name);
        glUniform1f(location, value);
    }
 
    void ShaderProgram::SetUniform(const std::string& name, float v0, float v1)
    {
        auto location = GetUniformLocation(name);
        glUniform2f(location, v0, v1);
    }
 
    void ShaderProgram::SetUniform(const std::string& name, const glm::mat4& mat)
    {
        auto location = GetUniformLocation(name);
        glUniformMatrix4fv(location, 1, GL_FALSE, glm::value_ptr(mat));
    }
 
    void ShaderProgram::SetUniform(const std::string& name, const glm::vec3& value)
    {
        auto location = GetUniformLocation(name);
        glUniform3fv(location, 1, glm::value_ptr(value));
    }
 
    void ShaderProgram::SetUniform(const std::string& name, const glm::vec4& value)
    {
        auto location = GetUniformLocation(name);
        glUniform4fv(location, 1, glm::value_ptr(value));
    }
 
    void ShaderProgram::SetTexture(const std::string& name, Texture* texture)
    {
        auto location = GetUniformLocation(name);
 
        glActiveTexture(GL_TEXTURE0 + m_currentTextureUnit);
        glBindTexture(GL_TEXTURE_2D, texture->GetID());
        glUniform1i(location, m_currentTextureUnit);
        ++m_currentTextureUnit;
    }
}