feat: engine as library

engine/src/components/batch.cpp

@@ -0,0 +1,19 @@
+#include <GL/glew.h>
+
+#include "engine/components/batch.h"
+
+unsigned int batch::LastID = 0;
+
+batch::batch() {
+    m_id = ++LastID;
+}
+
+void batch::prepare(glm::mat4 *instances, unsigned int count) {
+    if (m_instance_vbo == 0) {
+        glGenBuffers(1, &m_instance_vbo);
+    }
+    
+    glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
+        glBufferData(GL_ARRAY_BUFFER, sizeof(glm::mat4) * count, reinterpret_cast<void*>(instances), GL_DYNAMIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}