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#include "shader.h"
#include <fstream>
#include <iostream>
Shader::Shader(const std::string & fileName)
{
m_program = glCreateProgram();
m_shaders[0] = CreateShader(LoadShader(fileName + ".vs"), GL_VERTEX_SHADER);
m_shaders[1] = CreateShader(LoadShader(fileName + ".fs"), GL_FRAGMENT_SHADER);
for (unsigned int i = 0; i < NUM_SHADERS; i++)
glAttachShader(m_program, m_shaders[i]);
glBindAttribLocation(m_program, 0, "position");
glBindAttribLocation(m_program, 1, "texCoord");
glBindAttribLocation(m_program, 2, "normal");
glLinkProgram(m_program);
CheckShaderError(m_program, GL_LINK_STATUS, true, "Error linking shader program");
glValidateProgram(m_program);
CheckShaderError(m_program, GL_LINK_STATUS, true, "Invalid shader program");
m_uniforms[0] = glGetUniformLocation(m_program, "MVP");
m_uniforms[1] = glGetUniformLocation(m_program, "Normal");
m_uniforms[2] = glGetUniformLocation(m_program, "lightDirection");
}
Shader::~Shader()
{
for (unsigned int i = 0; i < NUM_SHADERS; i++) {
glDetachShader(m_program, m_shaders[i]);
glDeleteShader(m_shaders[i]);
}
glDeleteProgram(m_program);
}
void
Shader::Bind()
{
glUseProgram(m_program);
}
void
Shader::Update(const Transform & transform, const Camera & camera)
{
glm::mat4 MVP = transform.GetMVP(camera);
glm::mat4 Normal = transform.GetModel();
glUniformMatrix4fv(m_uniforms[0], 1, GL_FALSE, &MVP[0][0]);
glUniformMatrix4fv(m_uniforms[1], 1, GL_FALSE, &Normal[0][0]);
glUniform3f(m_uniforms[2], 0.0f, 0.0f, 1.0f);
}
std::string
Shader::LoadShader(const std::string & fileName)
{
std::ifstream file;
file.open((fileName).c_str());
std::string output;
std::string line;
if (file.is_open()) {
while (file.good()) {
getline(file, line);
output.append(line + "\n");
}
}
else {
std::cerr << "Unable to load shader: " << fileName << std::endl;
}
return output;
}
void
Shader::CheckShaderError(GLuint shader, GLuint flag, bool isProgram, const std::string & errorMessage)
{
GLint success = 0;
GLchar error[1024] = {0};
if (isProgram)
glGetProgramiv(shader, flag, &success);
else
glGetShaderiv(shader, flag, &success);
if (success == GL_FALSE) {
if (isProgram)
glGetProgramInfoLog(shader, sizeof(error), NULL, error);
else
glGetShaderInfoLog(shader, sizeof(error), NULL, error);
std::cerr << errorMessage << ": '" << error << "'" << std::endl;
}
}
GLuint
Shader::CreateShader(const std::string & text, unsigned int type)
{
GLuint shader = glCreateShader(type);
if (shader == 0)
std::cerr << "Error compiling shader type " << type << std::endl;
const GLchar * p[1];
p[0] = text.c_str();
GLint lengths[1];
lengths[0] = text.length();
glShaderSource(shader, 1, p, lengths);
glCompileShader(shader);
CheckShaderError(shader, GL_COMPILE_STATUS, false, "Error compiling shader!");
return shader;
}
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