Initial commit

source/Graphics/Shader.cpp

@@ -0,0 +1,100 @@
+
+#include <fstream>
+#include <Spectre/System/File.h>
+#include <Spectre/Graphics/OpenGL.h>
+#include <Spectre/Graphics/Shader.h>
+
+Shader::Shader(Type type, const std::string& name) : 
+m_name		(name)
+{
+	GLenum internal_type = type == Vertex ? GL_VERTEX_SHADER : GL_FRAGMENT_SHADER;
+	m_handle = glCreateShader(internal_type);
+}
+
+Shader::~Shader()
+{
+	if (m_handle) {
+		glDeleteShader(m_handle);
+	}
+}
+
+unsigned int Shader::getHandle() const
+{
+	return m_handle;
+}
+
+const std::string& Shader::getName() const
+{
+	return m_name;
+}
+
+bool Shader::loadFromFile(const std::string& file)
+{
+	std::string src;
+	std::ifstream strm;
+
+	// If this shader does not have a name, pick the filename.
+	if (m_name.length() < 1) {
+		m_name = File::getBasename(file);
+	}
+
+	// Load file into memory.
+	strm.open(file.c_str(), std::fstream::in);
+	if (!strm.is_open()) {
+		m_error = "Can't open file: " + file;
+		return false;
+	}
+
+	src.assign(std::istreambuf_iterator<char>(strm), std::istreambuf_iterator<char>());
+
+	strm.close();
+
+	return loadFromMemory(src);
+}
+
+bool Shader::loadFromMemory(const std::string& source)
+{
+	const char *s = source.c_str();
+
+	glShaderSource(m_handle, 1, &s, NULL);
+	
+	return compile();
+}
+
+const std::string& Shader::getError() const
+{
+	return m_error;
+}
+
+bool Shader::isCompiled() const
+{
+	// A shader without handle is not compiled.
+	if (m_handle) {
+
+		// Query OpenGL for status.
+		GLint status;
+		glGetShaderiv(m_handle, GL_COMPILE_STATUS, &status);
+		return status == GL_TRUE;
+	}
+	return false;
+}
+
+bool Shader::compile()
+{
+	glCompileShader(m_handle);
+
+	if (!isCompiled()) {
+		m_error = fetchErrorLog();
+		return false;
+	}
+	return true;
+}
+
+std::string Shader::fetchErrorLog()
+{
+	GLchar buf[4096] = { '\0 ' };
+
+	glGetShaderInfoLog(m_handle, sizeof(buf), NULL, buf);
+
+	return std::string(buf);
+}