1 files changed, 85 insertions, 0 deletions
diff --git a/08-august/src/camera.c b/08-august/src/camera.c
new file mode 100644
index 0000000..545ac85
--- /dev/null
+++ b/08-august/src/camera.c
@@ -0,0 +1,85 @@
+#include "camera.h"
+
+#include "util/util_time.h"
+
+static const float movementSpeed = 40.0f;
+
+void Camera_Init(camera_t* camera)
+{
+    camera->position = (vec3_t){ 4.0f, 40.0f, 4.0f };
+    camera->viewDirection = (vec3_t){ -1.0f, -1.0f, 0.0f };
+    camera->needsUpdate = true;
+    camera->up = (vec3_t){ 0.0f, 1.0f, 0.0f };
+}
+
+void Camera_Move_Up(camera_t* camera)
+{
+    vec3_t temp = vec3_scalar_mul(&camera->up, movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void Camera_Move_Down(camera_t* camera)
+{
+    vec3_t temp = vec3_scalar_mul(&camera->up, -movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void Camera_Move_Left(camera_t* camera)
+{
+    vec3_t 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_t* camera)
+{
+    vec3_t 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_t* camera)
+{
+    vec3_t temp = vec3_scalar_mul(&camera->viewDirection, movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void Camera_Move_Backward(camera_t* camera)
+{
+    vec3_t temp = vec3_scalar_mul(&camera->viewDirection, -movementSpeed * Time_GetFrameTime());
+    camera->position = vec3_add(&camera->position, &temp);
+}
+
+void Camera_MouseUpdate(camera_t* camera, const vec2_t* newMousePosition)
+{
+    vec2_t 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_t verticalRotation = vec3_cross_mul(&camera->viewDirection, &camera->up);
+
+    mat4_t 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;
+}
+
+mat4_t Camera_GetModelToViewMatrix(camera_t* camera)
+{
+    if(camera->needsUpdate)
+    {
+        vec3_t temp = vec3_add(&camera->position, &camera->viewDirection);
+        camera->viewMatrix = mat4_lookAt(&camera->position, &temp, &camera->up);
+    }
+    return camera->viewMatrix;
+}