2d fps camera

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.25)
 
-set(BLT_GRAPHICS_VERSION 0.11.7)
+set(BLT_GRAPHICS_VERSION 0.12.0)
 set(BLT_GRAPHICS_TEST_VERSION 0.0.1)
 
 project(BLT_WITH_GRAPHICS VERSION ${BLT_GRAPHICS_VERSION})

include/blt/gfx/renderer/2d_textured.vert

@@ -23,7 +23,7 @@ uniform mat4 model;
 uniform float z_index;
 
 void main()  {
-    gl_Position = ortho * model * vec4(vertex.xy, z_index, 1.0);
+    gl_Position = ovm * model * vec4(vertex.xy, z_index, 1.0);
     pos = vertex.xy;
     uv = uv_in;
 }

include/blt/gfx/renderer/camera.h

@@ -23,6 +23,11 @@
 
 namespace blt::gfx
 {
+    class lockable_camera
+    {
+        public:
+            static void handle_lock();
+    };
     
     class first_person_camera
     {
@@ -51,6 +56,34 @@ namespace blt::gfx
             void update_view(matrix_state_manager& manager);
     };
     
+    class first_person_camera_2d
+    {
+        private:
+            blt::vec3 position_;
+            blt::vec3 rotation_;
+            blt::vec3 speed_{165, 165, 165};
+            blt::vec3 world_scale_{1,1,1};
+        public:
+            void update();
+            
+            inline void speed(const blt::vec3& speed)
+            {
+                speed_ = speed;
+            }
+            
+            [[nodiscard]] inline const vec3& speed() const
+            {
+                return speed_;
+            }
+            
+            [[nodiscard]] inline const vec3& position() const
+            {
+                return position_;
+            }
+            
+            void update_view(matrix_state_manager& manager);
+    };
+    
 }
 
 #endif //BLT_WITH_GRAPHICS_CAMERA_H

include/blt/gfx/state.h

@@ -43,6 +43,8 @@ namespace blt::gfx
             blt::mat4x4 view;
             blt::mat4x4 pvm;
             blt::mat4x4 ovm;
+            blt::mat4x4 view_2d;
+            blt::vec3 scale_2d;
             std::int32_t last_width = 0, last_height = 0;
             uniform_buffer* global_matrix_ubo = nullptr;
         public:
@@ -69,19 +71,26 @@ namespace blt::gfx
             template<typename U>
             void setView(U&& mat)
             {
-                view = mat;
+                view = (mat);
+            }
+            
+            template<typename U, typename G>
+            void setView2D(U&& mat, G&& scale)
+            {
+                view_2d = (mat);
+                scale_2d = (scale);
             }
             
             template<typename U>
             void setPerspective(U&& mat)
             {
-                perspective = mat;
+                perspective = (mat);
             }
             
             template<typename U>
             void setOrtho(U&& mat)
             {
-                ortho = mat;
+                ortho = (mat);
             }
             
             void update_perspectives(std::int32_t width, std::int32_t height, float fov = 90, float near = 0.1f, float far = 500.0f,

src/blt/gfx/renderer/camera.cpp

@@ -17,28 +17,17 @@
  */
 #include <blt/gfx/renderer/camera.h>
 #include <blt/gfx/window.h>
+#include <blt/std/logging.h>
 
 void blt::gfx::first_person_camera::update()
 {
+    lockable_camera::handle_lock();
+    
     using namespace blt::gfx;
     vec3 move_at;
     
     float speed_multi = 1;
     
-    int locking_key = GLFW_KEY_ESCAPE;
-
-#ifdef __EMSCRIPTEN__
-    locking_key = GLFW_KEY_F1;
-#endif
-    
-    if (isKeyPressed(locking_key) && keyPressedLastFrame())
-    {
-        if (isCursorLocked())
-            unlockCursor();
-        else
-            lockCursor();
-    }
-    
     if (isKeyPressed(GLFW_KEY_LEFT_CONTROL))
         speed_multi = 10;
     if (isKeyPressed(GLFW_KEY_LEFT_ALT))
@@ -117,3 +106,82 @@ void blt::gfx::first_person_camera::update_view(blt::gfx::matrix_state_manager&
     view.translate(-position_);
     manager.setView(view);
 }
+
+float easeInOutCubic(float x)
+{
+    return static_cast<float>(x < 0.5 ? 4 * x * x * x : (x < 0.7 ? 1 - std::pow(-2 * x + 2, 3) / 2 : x + 0.19));
+}
+
+float easeInOutSine(float x)
+{
+    return static_cast<float>(-(std::cos(blt::PI * x) - 1) / 2);
+}
+
+void blt::gfx::first_person_camera_2d::update()
+{
+    lockable_camera::handle_lock();
+    
+    float speed_multi = 1;
+    
+    if (isKeyPressed(GLFW_KEY_LEFT_SHIFT))
+        speed_multi = 10;
+    if (isKeyPressed(GLFW_KEY_LEFT_CONTROL))
+        speed_multi = 0.5;
+    
+    vec3 direction;
+    
+    if (isKeyPressed(GLFW_KEY_W))
+        direction[1] = 1;
+    else if (isKeyPressed(GLFW_KEY_S))
+        direction[1] = -1;
+    else
+        direction[1] = 0;
+    
+    if (isKeyPressed(GLFW_KEY_A))
+        direction[0] = -1;
+    else if (isKeyPressed(GLFW_KEY_D))
+        direction[0] = 1;
+    else
+        direction[0] = 0;
+    
+    float scaling_const = easeInOutCubic(world_scale_[0]);
+    
+    if (isKeyPressed(GLFW_KEY_Q))
+        world_scale_[0] += scaling_const * static_cast<float>(getFrameDeltaSeconds());
+    else if (isKeyPressed(GLFW_KEY_E))
+        world_scale_[0] -= scaling_const * static_cast<float>(getFrameDeltaSeconds());
+    
+    if (world_scale_[0] <= 0.1f)
+        world_scale_[0] = 0.1f;
+    
+    world_scale_[1] = world_scale_[0];
+    
+    position_ = position_ + (direction * speed_ * speed_multi * static_cast<float>(getFrameDeltaSeconds()));
+}
+
+void blt::gfx::first_person_camera_2d::update_view(blt::gfx::matrix_state_manager& manager)
+{
+    blt::mat4x4 view;
+    view.rotateX(toRadians(rotation_.x()));
+    view.rotateY(toRadians(rotation_.y()));
+    view.rotateZ(toRadians(rotation_.z()));
+    view.translate(-position_);
+    manager.setView2D(view, world_scale_);
+}
+
+void blt::gfx::lockable_camera::handle_lock()
+{
+    int locking_key = GLFW_KEY_ESCAPE;
+
+#ifdef __EMSCRIPTEN__
+    locking_key = GLFW_KEY_F1;
+#endif
+    
+    if (isKeyPressed(locking_key) && keyPressedLastFrame())
+    {
+        if (isCursorLocked())
+            unlockCursor();
+        else
+            lockCursor();
+    }
+}

src/blt/gfx/state.cpp

@@ -22,7 +22,9 @@
 void blt::gfx::matrix_state_manager::update()
 {
     pvm = perspective * view;
-    ovm = ortho * view;
+    blt::mat4x4 scaled;
+    scaled.scale(scale_2d);
+    ovm = scaled * ortho * view_2d;
     BLT_ASSERT(global_matrix_ubo != nullptr && "You forgot to call create_internals(). Make sure you call cleanup() as well!");
     global_matrix_ubo->upload((void*)perspective.ptr(), sizeof(blt::mat4x4), 0);
     global_matrix_ubo->upload((void*)ortho.ptr(), sizeof(blt::mat4x4), sizeof(blt::mat4x4));