faet: add tile selector

src/render/Renderer.cpp

@@ -48,6 +48,8 @@ void initShader(){
 bool init(){
     glbinding::Binding::initialize();
     glEnable(GL_TEXTURE_2D);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);  
     initShader();
     return true;
 }
@@ -127,6 +129,19 @@ void setIsometricView(bool isometric){
     isometricView = isometric;
 }
 
+glm::vec2 getCursorWorldPos(const glm::vec2& cursorPos, float aspectRatio, float zoom, float windowWidth, float windowHeight){
+    float relativeX = (cursorPos.x / windowWidth * 2) - 1;
+    float relativeY = (cursorPos.y / windowHeight * 2) - 1;
+
+    float deltaX = relativeX * aspectRatio / zoom;
+    float deltaY = relativeY / zoom;
+
+    float worldX = camPos.x + deltaX * (1 - isometricView) + (0.5 * deltaX - deltaY) * isometricView;
+    float worldY = camPos.y + deltaY * (1 - isometricView) + (0.5 * deltaX + deltaY) * isometricView;
+
+    return {worldX, worldY};
+}
+
 } // namespace Renderer
 
 } // namespace render

src/render/WorldRenderer.cpp

@@ -13,12 +13,22 @@ void WorldRenderer::loadModels(){
     std::cout << "World Created !\n";
     m_WorldVao = std::make_unique<GL::VAO>(std::move(WorldLoader::loadWorldModel(m_World)));
     m_MobVao = std::make_unique<GL::VAO>(std::move(WorldLoader::loadMobModel()));
+    m_SelectTileVao = std::make_unique<GL::VAO>(std::move(WorldLoader::loadTileSelectModel()));
     std::cout << "Vertex Count : " << m_WorldVao->getVertexCount() << std::endl;
 }
 
 WorldRenderer::WorldRenderer(game::World* world) : m_World(world){
 }
 
+void WorldRenderer::updateCursorPos(){
+    ImGuiIO& io = ImGui::GetIO();
+
+    float mouseX = io.MousePos.x;
+    float mouseY = io.MousePos.y;
+
+    m_CursorPos = Renderer::getCursorWorldPos({mouseX, mouseY}, Display::getAspectRatio(), m_Zoom, Display::getWindowWidth(), Display::getWindowHeight());
+}
+
 void WorldRenderer::update(){
     if(m_WorldVao == nullptr)
         return;
@@ -32,6 +42,7 @@ void WorldRenderer::update(){
     if(io.MouseWheel != 0){
         changeZoom(io.MouseWheel);
     }
+    updateCursorPos();
 }
 
 void WorldRenderer::renderWorld() const{
@@ -48,6 +59,14 @@ void WorldRenderer::renderMobs() const{
 }
 
 void WorldRenderer::renderTowers() const{
+    Renderer::Model tileSelectModel;
+    tileSelectModel.vao = m_SelectTileVao.get();
+    tileSelectModel.positon = {(int) m_CursorPos.x, (int) m_CursorPos.y};
+    
+    Renderer::renderModel(tileSelectModel);
+}
+
+void WorldRenderer::renderTileSelect() const{
 
 }
 
@@ -57,6 +76,7 @@ void WorldRenderer::render() const{
     renderWorld();
     renderMobs();
     renderTowers();
+    renderTileSelect();
 }
 
 WorldRenderer::~WorldRenderer(){

src/render/loader/WorldLoader.cpp

@@ -156,6 +156,38 @@ GL::VAO loadWorldModel(const td::game::World* world){
     return worldVao;
 }
 
+GL::VAO loadTileSelectModel(){
+    std::vector<float> positions = {
+        0, 0,
+        1, 0,
+        0, 1,
+
+        1, 0,
+        0, 1,
+        1, 1
+    };
+
+    int color = 255 << 24 | 255 << 16 | 255 << 8 | 150;
+    float colorFloat;
+
+    memcpy((std::uint8_t*) &colorFloat, &color, sizeof(float));
+
+    std::vector<float> colors(6, colorFloat);
+
+    GL::VBO positionVBO(positions, 2);
+    positionVBO.addVertexAttribPointer(0, 2, 0);
+    GL::VBO colorVBO(colors, 1);
+    colorVBO.addVertexAttribPointer(1, 1, 0);
+
+    GL::VAO tileSelectVao(positions.size() / 2); // each pos = 2 vertecies
+    tileSelectVao.bind();
+    tileSelectVao.bindVBO(positionVBO);
+    tileSelectVao.bindVBO(colorVBO);
+    tileSelectVao.unbind();
+
+    return tileSelectVao;
+}
+
 } // namespace WorldLoader