From 9c575f056ef47ef7e8da581164041985749c1676 Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Sat, 26 Jan 2019 12:58:51 +0500
Subject: Implemented new Shader class

---
 src/Shader.cpp | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)

(limited to 'src/Shader.cpp')

diff --git a/src/Shader.cpp b/src/Shader.cpp
index d637c3b..9447131 100644
--- a/src/Shader.cpp
+++ b/src/Shader.cpp
@@ -111,3 +111,88 @@ void Shader::Reload() {
 	new(this) Shader(vertexPath, fragmentPath);
 	LOG(INFO) << "Shader is realoded!";
 }
+
+GLuint NewShader::GetUniformLocation(const std::string &name) {
+	auto it = uniforms.find(name);
+	if (it == uniforms.end()) {
+		LOG(ERROR) << "Accessed not existing uniform " << name;
+		return 0;
+	}
+	return it->second;
+}
+
+NewShader::NewShader(const std::string &vertSource, const std::string &fragSource, const std::vector<std::string> &uniformsNames)
+{
+	bool vertFailed = false, fragFailed = false, linkFailed = false, uniformsFailed = false;
+	const GLchar *vertSourcePtr = vertSource.c_str();
+	const GLchar *fragSourcePtr = fragSource.c_str();
+
+	GLuint vertex, fragment;
+	GLint success;
+	GLchar infoLog[512];
+
+	vertex = glCreateShader(GL_VERTEX_SHADER);
+	glShaderSource(vertex, 1, &vertSourcePtr, NULL);
+	glCompileShader(vertex);
+
+	glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(vertex, 512, NULL, infoLog);
+		LOG(ERROR) << "Vertex shader compilation failed: " << std::endl << infoLog;
+		vertFailed = true;
+	};
+
+	fragment = glCreateShader(GL_FRAGMENT_SHADER);
+	glShaderSource(fragment, 1, &fragSourcePtr, NULL);
+	glCompileShader(fragment);
+
+	glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(fragment, 512, NULL, infoLog);
+		LOG(ERROR) << "Fragment shader compilation failed: " << std::endl << infoLog;
+		fragFailed = true;
+	};
+
+	if (vertFailed || fragFailed)
+		throw std::runtime_error("Shaders not compiled");
+
+	program = glCreateProgram();
+	glAttachShader(program, vertex);
+	glAttachShader(program, fragment);	
+	glLinkProgram(program);
+	glGetProgramiv(program, GL_LINK_STATUS, &success);
+	if (!success) {
+		glGetProgramInfoLog(program, 512, NULL, infoLog);
+		LOG(ERROR) << "Shader program not linked: " << std::endl << infoLog;
+		linkFailed = true;
+	}
+
+	glDeleteShader(vertex);
+	glDeleteShader(fragment);
+
+	if (linkFailed)
+		throw std::runtime_error("Shader not linked");
+
+
+	for (auto &it : uniformsNames) {
+		GLuint location = glGetUniformLocation(program, it.c_str());
+		if (location == -1) {
+			glDeleteProgram(program);
+			LOG(ERROR) << "Uniform name \"" << it << "\" not found in shader";
+			throw std::runtime_error("Invalid uniform");
+		}
+
+		uniforms[it] = location;
+	}
+}
+
+NewShader::~NewShader()
+{
+	if (program)
+		glDeleteProgram(program);
+}
+
+void NewShader::Activate()
+{
+	glUseProgram(program);
+}
-- 
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