95 lines
2.2 KiB
C++
95 lines
2.2 KiB
C++
#include "MyGraphicsEngine/Shader.h"
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Shader::Shader(const std::string vertexShaderPath, const std::string fragmentShaderPath)
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{
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char infoLog[512];
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int succes;
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char* vertexCode = readFile(vertexShaderPath.c_str());
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unsigned int vertId = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertId, 1, &vertexCode, NULL);
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glCompileShader(vertId);
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glGetShaderiv(vertId, GL_COMPILE_STATUS, &succes);
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if(!succes){
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glGetShaderInfoLog(vertId, 512, NULL, infoLog);
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spdlog::error( "Vertex shader has compile error {}", infoLog);
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return;
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}
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char* fragmentCode = readFile(fragmentShaderPath.c_str());
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unsigned int fragId = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragId, 1, &fragmentCode, NULL);
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glCompileShader(fragId);
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glGetShaderiv(fragId, GL_COMPILE_STATUS, &succes);
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if(!succes){
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glGetShaderInfoLog(fragId, 512, NULL, infoLog);
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spdlog::error("Fragment shader has compile error {}", infoLog);
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return;
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}
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id = glCreateProgram();
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glAttachShader(id, vertId);
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glAttachShader(id, fragId);
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glLinkProgram(id);
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int success;
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glGetProgramiv(id, GL_LINK_STATUS, &success);
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if(!success) {
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glGetProgramInfoLog(id, 512, NULL, infoLog);
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printf("ERROR::SHADER_PROGRAM::LINKING_FAILED\n %s", infoLog);
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}
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delete vertexCode;
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delete fragmentCode;
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}
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char* Shader::readFile (const char* filePath){
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spdlog::info("try Open file {}", filePath);
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std::ifstream file ;
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file.open(filePath);
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if(file.is_open() == false){
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spdlog::info("File not found.");
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return nullptr;
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}
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// Determine the file size!
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file.seekg(0, std::ios::end);
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size_t filesize = file.tellg();
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// Undo previous seek.
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file.seekg(0, std::ios::beg);
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spdlog::info("filesize: {}", filesize);
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// Create a big enough buffer for the file
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size_t bufferSize = filesize + 3;
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char* FileBuffer = new char[bufferSize];
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memset(FileBuffer, '\0', bufferSize);
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// read the whole file
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file.read(FileBuffer, filesize);
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return FileBuffer;
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}
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void Shader::Use()
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{
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glUseProgram(id);
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} |