fixes

source/opengl/data/shader_data.cpp

@@ -0,0 +1,46 @@
+#include "opengl/data/shader_data.hpp"
+
+#include "GL/glew.h"
+#include "opengl/error.hpp"
+#include "util/logger.hpp"
+
+namespace zgl
+{
+std::error_code shader_data::build_from(
+	const GLenum type,
+	const std::string& source,
+	shader_data& data
+) {
+	auto shader_id = GLuint{ 0 };
+
+	if (not source.empty())
+	{
+		shader_id = glCreateShader(type);
+
+		// Curious choice to take lists as parameters...
+		const auto first_list_element = source.c_str();
+		const auto first_list_element_len = static_cast<GLint>(source.length());
+		glShaderSource(shader_id, 1, &first_list_element, &first_list_element_len);
+		glCompileShader(shader_id);
+
+		GLint success;
+		glGetShaderiv(shader_id, GL_COMPILE_STATUS, &success);
+		if (not success)
+		{
+			GLint log_length{};
+			glGetShaderiv(shader_id, GL_INFO_LOG_LENGTH, &log_length);
+
+			auto log = std::string(log_length, ' ');
+			glGetShaderInfoLog(shader_id, log_length, nullptr, log.data());
+
+			ztu::logger::warn("Error while compiling shader:\n%", log);
+
+			return std::make_error_code(std::errc::invalid_argument);
+		}
+	}
+
+	data = shader_data{ shader_id, type };
+
+	return {};
+}
+}