1 files changed, 95 insertions, 0 deletions
diff --git a/09-september/tomcat/renderer/camera.c b/09-september/tomcat/renderer/camera.c
new file mode 100644
index 0000000..8a0c620
--- /dev/null
+++ b/09-september/tomcat/renderer/camera.c
@@ -0,0 +1,95 @@
+#include "camera.h"
+
+#include "../util/util_time.h"
+
+static const float movementSpeed = 40.0f;
+
+Camera *camera_new()
+{
+    Camera *camera;
+    camera = malloc( sizeof(Camera) );
+
+    camera->position = (Vec3){ 0.0f, 6.0f, 0.0f };
+    camera->viewDirection = (Vec3){ 0.5f, 0.0f, -1.0f };
+    camera->needsUpdate = true;
+    camera->up = (Vec3){ 0.0f, 1.0f, 0.0f };
+
+    return camera;
+}
+
+void camera_move_up(Camera* camera)
+{
+    Vec3 temp = vec3_scalar_mul(&camera->up, movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void camera_move_down(Camera* camera)
+{
+    Vec3 temp = vec3_scalar_mul(&camera->up, -movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void camera_move_left(Camera* camera)
+{
+    Vec3 strafeDirection = vec3_cross_mul(&camera->viewDirection, &camera->up);
+    strafeDirection = vec3_scalar_mul(&strafeDirection, -movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &strafeDirection);
+}
+
+void camera_move_right(Camera* camera)
+{
+    Vec3 strafeDirection = vec3_cross_mul(&camera->viewDirection, &camera->up);
+    strafeDirection = vec3_scalar_mul(&strafeDirection, movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &strafeDirection);
+}
+
+void camera_move_foward(Camera* camera)
+{
+    Vec3 temp = vec3_scalar_mul(&camera->viewDirection, movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void camera_move_backward(Camera* camera)
+{
+    Vec3 temp = vec3_scalar_mul(&camera->viewDirection, -movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void camera_mouse_update(Camera *camera, const Vec2 *newMousePosition)
+{
+    Vec2 mouseDelta = vec2_sub(newMousePosition, &camera->mousePosition);
+
+    /* El if evita que el mouse se teletrasporte al cambiar de posicion muy rapido */
+    if(vec2_length(&mouseDelta) > 50.0f){
+        camera->mousePosition = *newMousePosition;
+        return;
+    }
+
+    Vec3 verticalRotation = vec3_cross_mul(&camera->viewDirection, &camera->up);
+
+    Mat4 temp = mat4_rotate(mouseDelta.x * -0.5f, &camera->up);
+
+    camera->viewDirection = mat4_mul_vec3(&temp, &camera->viewDirection);
+
+    temp = mat4_rotate(mouseDelta.y * -0.5f, &verticalRotation);
+    camera->viewDirection = mat4_mul_vec3(&temp, &camera->viewDirection);
+
+    camera->mousePosition = *newMousePosition;
+
+    camera->needsUpdate = true;
+}
+
+void camera_free(Camera *camera)
+{
+    free(camera);
+}
+
+Mat4 camera_get_model_to_view_matrix(Camera* camera)
+{
+    if(camera->needsUpdate)
+    {
+        Vec3 temp = vec3_add(&camera->position, &camera->viewDirection);
+        camera->viewMatrix = mat4_lookAt(&camera->position, &temp, &camera->up);
+    }
+    return camera->viewMatrix;
+}