void AssimpProgram::compile() {
std::string vertexShaderCode("layout (location = 0) in vec3 position;\n"
"layout (location = 1) in vec3 normal;\n"
"layout (location = 2) in vec2 texCoords;\n"
"\n"
"out vec2 TexCoords;\n"
"\n"
"uniform mat4 uMVPMatrix;\n"
"\n"
"void main()\n"
"{\n"
" gl_Position = uMVPMatrix * vec4(position, 1.0f);\n"
" TexCoords = texCoords;\n"
"}");
std::string fragmentShaderCode("\n"
"in vec2 TexCoords;\n"
"\n"
"out vec4 color;\n"
"\n"
"uniform sampler2D textureDiffuse;\n"
"\n"
"void main()\n"
"{\n"
" color = vec4(texture(textureDiffuse, TexCoords));\n"
"}");
programID = Shader::createShaderProgram(vertexShaderCode, fragmentShaderCode);
uMVPMatrix = (GLuint) glGetUniformLocation(programID, "uMVPMatrix");
}
GLuint loadShaders(const std::string & vertexFilePath,
const std::string & fragmentFilePath)
{
// Create the shaders
GLuint vertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Read the Vertex Shader code from the file
std::ifstream vertexShaderStream(vertexFilePath);
if(!vertexShaderStream.is_open()) {
std::cerr << "Impossible to open " << vertexFilePath << '\n';
return 0;
}//if
std::string vertexShaderCode(
(std::istreambuf_iterator<char>(vertexShaderStream)),
std::istreambuf_iterator<char>());
// Read the Fragment Shader code from the file
std::ifstream fragmentShaderStream(fragmentFilePath);
if(!fragmentShaderStream.is_open()) {
std::cerr << "Impossible to open " << fragmentFilePath << '\n';
return 0;
}//if
std::string fragmentShaderCode(
(std::istreambuf_iterator<char>(fragmentShaderStream)),
std::istreambuf_iterator<char>());
GLint status = GL_FALSE;
int infoLogLength;
// Compile Vertex Shader
std::cout << "Compiling Vertex Shader: " << vertexFilePath << '\n';
const char * vertexSourcePointer = vertexShaderCode.c_str();
glShaderSource(vertexShaderID, 1, &vertexSourcePointer , nullptr);
glCompileShader(vertexShaderID);
// Check Vertex Shader
glGetShaderiv(vertexShaderID, GL_COMPILE_STATUS, &status);
glGetShaderiv(vertexShaderID, GL_INFO_LOG_LENGTH, &infoLogLength);
if(infoLogLength > 0){
std::string vertexShaderErrorMessage(infoLogLength + 1, '\0');
glGetShaderInfoLog(vertexShaderID, infoLogLength, nullptr,
(GLchar *)(vertexShaderErrorMessage.data()));
std::cerr << vertexShaderErrorMessage << '\n';
}//if
// Compile Fragment Shader
std::cout << "Compiling Fragment Shader: " << fragmentFilePath << '\n';
char const * fragmentSourcePointer = fragmentShaderCode.c_str();
glShaderSource(fragmentShaderID, 1, &fragmentSourcePointer, nullptr);
glCompileShader(fragmentShaderID);
// Check Fragment Shader
glGetShaderiv(fragmentShaderID, GL_COMPILE_STATUS, &status);
glGetShaderiv(fragmentShaderID, GL_INFO_LOG_LENGTH, &infoLogLength);
if(infoLogLength > 0){
std::string fragmentShaderErrorMessage(infoLogLength + 1, '\0');
glGetShaderInfoLog(fragmentShaderID, infoLogLength, nullptr,
(GLchar *)(fragmentShaderErrorMessage.data()));
std::cerr << fragmentShaderErrorMessage << '\n';
}//if
// Link the program
std::cout << "Linking program: " << vertexFilePath << " & "
<< fragmentFilePath << '\n';
GLuint programID = glCreateProgram();
glAttachShader(programID, vertexShaderID);
glAttachShader(programID, fragmentShaderID);
glLinkProgram(programID);
// Check the program
glGetProgramiv(programID, GL_LINK_STATUS, &status);
glGetProgramiv(programID, GL_INFO_LOG_LENGTH, &infoLogLength);
if(infoLogLength > 0){
std::string programErrorMessage(infoLogLength + 1, '\0');
glGetProgramInfoLog(programID, infoLogLength, nullptr,
(GLchar *)(programErrorMessage.data()));
std::cerr << programErrorMessage << '\n';
}//if
glDeleteShader(vertexShaderID);
glDeleteShader(fragmentShaderID);
return programID;
}//loadShaders(vertexShaderStream, fragmentFilePath)
void Game::LoadAndCompileShaders()
{
// In the future, this should return an GLuint ID for the shader program.
// Also, in the future, this should be adding a shader program to a material component.
// Essentially, the eventual purpose of this function will be to load all the shaders for all the mats.
std::ifstream inf("vertexShader.vertex");
std::string vertexShaderCode ( (std::istreambuf_iterator<char>(inf) ), (std::istreambuf_iterator<char>() ) );
inf.close();
inf.open("fragmentShader.frag");
std::string fragmentShaderCode ( (std::istreambuf_iterator<char>(inf)), (std::istreambuf_iterator<char>() ) );
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
GLint Result = GL_FALSE;
int InfoLogLength;
std::ofstream log("log.txt");
std::cout << " Compiling Vertex Shader" << std::endl;
char const * VertexSourcePointer = vertexShaderCode.c_str();
glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
glCompileShader(VertexShaderID);
// Check shader compilation
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if(InfoLogLength > 0)
{
std::vector<char> VertexShaderErrorMessage(InfoLogLength);
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
std::cout << &VertexShaderErrorMessage[0] << std::endl;
log << &VertexShaderErrorMessage[0] << std::endl;
}
std::cout << "Compiling Fragment Shader" << std::endl;
char const * FragmentSourcePointer = fragmentShaderCode.c_str();
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
glCompileShader(FragmentShaderID);
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if(InfoLogLength > 0)
{
std::vector<char> FragmentShaderErrorMessage(InfoLogLength);
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
std::cout << &FragmentShaderErrorMessage[0] << std::endl;
log << &FragmentShaderErrorMessage[0] << std::endl;
}
std::cout << "Linking Program" << std::endl;
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
glGetProgramiv(ProgramID, GL_COMPILE_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> ProgramErrorMessage(std::max(InfoLogLength, int(1)));
std::cout << &ProgramErrorMessage[0] << std::endl;
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
glValidateProgram(ProgramID);
ShaderProgramID = ProgramID;
}
