Finished OpenGL rewrite§

src/objects/Shader.cpp

@@ -0,0 +1,104 @@
+#include "Shader.hpp"
+
+#include <iostream>
+#include <fstream>
+
+Shader::Shader(const char* vertShaderPath, const char* fragShaderPath) :
+	program(0)
+{
+	int success;
+	char errorBuffer[512];
+
+	// Create Vertex shader
+	unsigned int vert;
+	vert = glCreateShader(GL_VERTEX_SHADER);
+	char* sourceBuffer;
+	LoadShaderSource(vertShaderPath, &sourceBuffer);
+	if (sourceBuffer == nullptr)
+		sourceBuffer = "";
+
+	glShaderSource(vert, 1, &sourceBuffer, NULL);
+	glCompileShader(vert);
+	glGetShaderiv(vert, GL_COMPILE_STATUS, &success);
+	if (!success)
+	{
+		glGetShaderInfoLog(vert, 512, NULL, errorBuffer);
+		std::cerr << vertShaderPath << std::endl << errorBuffer << std::endl;
+		return;
+	}
+
+	// Create Fragment shader
+	unsigned int frag;
+	frag = glCreateShader(GL_FRAGMENT_SHADER);
+	LoadShaderSource(fragShaderPath, &sourceBuffer);
+	if (sourceBuffer == nullptr)
+		sourceBuffer = "";
+
+	glShaderSource(frag, 1, &sourceBuffer, NULL);
+	glCompileShader(frag);
+	glGetShaderiv(frag, GL_COMPILE_STATUS, &success);
+	if (!success)
+	{
+		glGetShaderInfoLog(frag, 512, NULL, errorBuffer);
+		std::cerr << fragShaderPath << std::endl << errorBuffer << std::endl;
+		return;
+	}
+
+	// Link shaders
+	program = glCreateProgram();
+	glAttachShader(program, vert);
+	glAttachShader(program, frag);
+	glLinkProgram(program);
+	glGetProgramiv(program, GL_LINK_STATUS, &success);
+	if (!success)
+	{
+		glGetProgramInfoLog(program, 512, NULL, errorBuffer);
+		std::cerr << errorBuffer << std::endl;
+		return;
+	}
+
+	glDeleteShader(frag);
+	glDeleteShader(vert);
+}
+
+Shader::~Shader()
+{
+	glDeleteProgram(program);
+}
+
+void Shader::Use()
+{
+	glUseProgram(program);
+}
+
+void Shader::SetUniformMat4(const char* location, const float* value) const
+{
+	glUniformMatrix4fv(glGetUniformLocation(program, location), 1, GL_FALSE, value);
+}
+
+void Shader::LoadShaderSource(const char* filepath, char** buffer)
+{
+	std::ifstream file(filepath);
+	if (!file.good())
+	{
+		std::cerr << "Failed to open file: " << filepath << std::endl;
+		*buffer = nullptr;
+		return;
+	}
+
+	std::string source(
+		(std::istreambuf_iterator<char>(file)),
+		std::istreambuf_iterator<char>()
+	);
+	size_t len = source.size();
+
+	*buffer = (char*)malloc(len + sizeof(char));
+	if (*buffer == nullptr)
+	{
+		std::cerr << "Failed to allocate memory for shader source code" << std::endl;
+		return;
+	}
+
+	memcpy_s(*buffer, len, source.c_str(), len);
+	(*buffer)[len] = '\0';
+}