--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Texture.cpp	Mon Dec 04 21:03:53 2023 +0100
@@ -0,0 +1,86 @@
+/**
+ * ShaderShark
+ * Copyright © 2023 František Kučera (Frantovo.cz, GlobalCode.info)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string>
+#include <stdexcept>
+
+#include "opengl.h"
+#include "Texture.h"
+
+class Texture::Impl {
+public:
+	GLuint id;
+	std::string fileName;
+	int width;
+	int height;
+};
+
+Texture::Texture(
+		int width,
+		int height,
+		const Buffer& img,
+		const std::string& fileName) : impl(new Impl()) {
+	impl->fileName = fileName;
+	glGenTextures(1, &impl->id);
+	update(width, height, img);
+}
+
+Texture::~Texture() {
+	glDeleteTextures(1, &impl->id);
+	delete impl;
+}
+
+GLuint Texture::getId() const {
+	return impl->id;
+}
+
+const std::string Texture::getFileName() const {
+	return impl->fileName;
+}
+
+int Texture::getWidth() const {
+	return impl->width;
+}
+
+int Texture::getHeight() const {
+	return impl->height;
+}
+
+GLfloat Texture::getRatio() const {
+	return (GLfloat) impl->width / (GLfloat) impl->height;
+}
+
+void Texture::update(int width, int height, const Buffer& img) {
+	impl->width = width;
+	impl->height = height;
+
+	if (img.getSize() != impl->width * impl->height * 4)
+		throw std::invalid_argument("invalid image size");
+
+	glBindTexture(GL_TEXTURE_2D, impl->id);
+	auto GLT2D = GL_TEXTURE_2D;
+	glTexImage2D(GLT2D, 0, GL_RGBA,
+			impl->width, impl->height,
+			0, GL_RGBA, GL_UNSIGNED_BYTE,
+			img.getData());
+	glTexParameteri(GLT2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GLT2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexParameteri(GLT2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GLT2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+	glGenerateMipmap(GLT2D);
+	checkError(&std::cerr);
+}