feat: add basic towers rendering

src/render/VertexCache.cpp

@@ -0,0 +1,57 @@
+#include "render/VertexCache.h"
+#include "render/loader/GLLoader.h"
+
+namespace td {
+namespace render {
+
+void VertexCache::addData(std::uint64_t index, std::vector<float> positions, std::vector<float> colors){
+    ElementsIndex positionsIndexes;
+    positionsIndexes.first = m_Positions.end();
+    m_Positions.insert(m_Positions.end(), positions.begin(), positions.end());
+    positionsIndexes.second = m_Positions.end() - 1;
+
+    ElementsIndex colorsIndexes;
+    colorsIndexes.first = m_Colors.end();
+    m_Colors.insert(m_Colors.end(), colors.begin(), colors.end());
+    colorsIndexes.second = m_Colors.end() - 1;
+
+    m_Indexes.insert({index, {positionsIndexes, colorsIndexes}});
+}
+
+void VertexCache::removeData(std::uint64_t index){
+    auto it = m_Indexes.find(index);
+    if(it != m_Indexes.end()){
+        DataIndex indexes = it->second;
+        ElementsIndex positionsIndexes = indexes.first;
+        ElementsIndex colorsIndexes = indexes.second;
+
+        m_Positions.erase(positionsIndexes.first, positionsIndexes.second);
+        m_Colors.erase(colorsIndexes.first, colorsIndexes.second);
+
+        m_Indexes.erase(it);
+    }
+}
+
+void VertexCache::clear(){
+    m_Positions.clear();
+    m_Colors.clear();
+    m_Indexes.clear();
+}
+
+void VertexCache::updateVertexArray(){
+    m_VertexArray = std::make_unique<GL::VertexArray>(m_Colors.size()); // one color per vertex
+
+    GL::VertexBuffer positionsBuffer(m_Positions, 2);
+    positionsBuffer.addVertexAttribPointer(0, 2, 0);
+
+    GL::VertexBuffer colorsBuffer(m_Colors, 1);
+    colorsBuffer.addVertexAttribPointer(1, 1, 0);
+
+    m_VertexArray->bind();
+    m_VertexArray->bindVertexBuffer(positionsBuffer);
+    m_VertexArray->bindVertexBuffer(colorsBuffer);
+    m_VertexArray->unbind();
+}
+
+} // namespace render
+} // namespace td