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#include "shaders.hpp"
/**
* Default Ray Marching Shader
* Any change is forbidden :P
*/
std::string VertexShader="\
#version 330 core \n\
layout(location = 0) in vec3 position; \n\
uniform mat4 projection; \n\
uniform mat4 model; \n\
void main(){ \n\
gl_Position = projection * model * vec4(position,1); \n\
}";
/**
* Read shaders and handle #include directive
* @param shader_name
* @return string containing shader source code
*/
std::string ReadShader(std::string shader_name){
std::string shader_path=std::string(SHADERS_RESOURCES) + "/" + shader_name;
std::ifstream shader_file;
shader_file.open(shader_path);
if(!shader_file.is_open()) {
std::cout << "Failed to open: " << shader_path << std::endl;
exit(EXIT_FAILURE);
}
std::string line;
std::stringstream src;
while(getline(shader_file, line)){
if(line.find("#include")!=std::string::npos){
int from=line.find("\"")+1;
if(from !=std::string::npos){
int until=line.size()-from-1;
src << ReadShader(line.substr(from,until)) << std::endl;
continue;
}
}
src << line << std::endl;
}
return(src.str());
}
GLuint CompileShader(std::string shader_name){
// Create ids
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Compile vertex shader
char const * vsrc_c = VertexShader.c_str();
glShaderSource(VertexShaderID, 1, &vsrc_c, NULL);
glCompileShader(VertexShaderID);
// Compile fragment shader
std::string fsrc_cpp=ReadShader(shader_name);
char const * fsrc_c = fsrc_cpp.c_str();
glShaderSource(FragmentShaderID, 1, &fsrc_c, NULL);
glCompileShader(FragmentShaderID);
// Link programs
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
// Cleaning
glDetachShader(ProgramID, VertexShaderID);
glDetachShader(ProgramID, FragmentShaderID);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}
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