90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
#include <shader.hpp>
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#include <fstream>
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#include <string>
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#include <algorithm>
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#include <iostream>
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namespace oglu
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{
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Shader::Shader(const char* vertexShaderFile, const char* fragmentShaderFile) :
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vertexShader(0), fragmentShader(0)
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{
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// Load vertex shader
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char* source = nullptr;
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LoadShaderSource(vertexShaderFile, &source);
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vertexShader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertexShader, 1, &source, NULL);
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glCompileShader(vertexShader);
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int success;
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char infoLog[512];
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glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
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if (!success)
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{
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glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
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delete source;
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throw std::exception(std::string("Failed to compile shader " + std::string(vertexShaderFile) + "\n" + infoLog).c_str());
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}
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delete source;
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// Load Fragment shader
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LoadShaderSource(fragmentShaderFile, &source);
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fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragmentShader, 1, &source, NULL);
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glCompileShader(fragmentShader);
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glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
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if (!success)
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{
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glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
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delete source;
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throw std::exception(std::string("Failed to compile shader " + std::string(fragmentShaderFile) + "\n" + infoLog).c_str());
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}
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delete source;
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// Link into program
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program = glCreateProgram();
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glAttachShader(program, vertexShader);
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glAttachShader(program, fragmentShader);
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &success);
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if (!success)
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{
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glGetProgramInfoLog(program, 512, NULL, infoLog);
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throw std::exception(std::string("Failed to link program.\n" + std::string(infoLog)).c_str());
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}
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// Dispose of shader objects
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glDeleteShader(fragmentShader);
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glDeleteShader(vertexShader);
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}
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Shader::~Shader()
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{
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}
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void Shader::Use()
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{
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glUseProgram(program);
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}
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void Shader::LoadShaderSource(const char* filename, char** buffer)
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{
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std::ifstream file(filename);
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if (!file.good())
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{
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file.close();
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throw std::exception(std::string("Failed to open shader file: " + std::string(filename)).c_str());
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}
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std::string str((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
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(*buffer) = (char*)malloc(str.size() + 1);
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memcpy(*buffer, str.c_str(), str.size());
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(*buffer)[str.size()] = '\x00';
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}
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} |