Rot + Scale!

cve_game_object.hpp

@@ -8,7 +8,17 @@ namespace cve {
 
   struct Transform2dComponent {
     glm::vec2 translation{}; // Position offset
-    glm::mat2 mat2() { return glm::mat2{1.f}; };
+    glm::vec2 scale{1.f, 1.f};
+    float rotation;
+    
+    glm::mat2 mat2() {
+      const float s = glm::sin(rotation);
+      const float c = glm::cos(rotation);
+      glm::mat2 rotMatrix{{c, s}, {-s, c}};
+      
+      glm::mat2 scaleMat{{scale.x, .0f}, {.0f, scale.y}};
+      return rotMatrix*scaleMat;
+    };
   };
 
   class CveGameObject {

first_app.cpp

@@ -6,6 +6,7 @@
 #define GLM_FORCE_RADIANS
 #define GLM_FORCE_DEPTH_ZERO_TO_ONE
 #include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
 
 namespace cve {
   struct SimplePushConstantData{
@@ -47,6 +48,8 @@ namespace cve {
     triangle.model = cveModel;
     triangle.color = {0.1f, 0.8f, 0.1f};
     triangle.transform2d.translation.x = .2f;
+    triangle.transform2d.scale = {2.f, .5f};
+    triangle.transform2d.rotation = .25f * glm::two_pi<float>();
     
     gameObjects.push_back(std::move(triangle));
   }
@@ -179,6 +182,8 @@ namespace cve {
     cvePipeline->bind(commandBuffer);
 
     for (auto& obj: gameObjects) {
+      obj.transform2d.rotation = glm::mod(obj.transform2d.rotation + 0.001f, glm::two_pi<float>());
+
       SimplePushConstantData push{};
       push.offset = obj.transform2d.translation;
       push.color = obj.color;