fixed negative value crash

1 files changed, 24 insertions, 2 deletions

diff --git a/src/main.c b/src/main.c
index c5439e5..e863001 100755
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,4 @@
+#include <SDL2/SDL_render.h>
 #include <SDL2/SDL_timer.h>
 #include <stdio.h>
 #include <stdbool.h>
@@ -64,6 +65,7 @@ int main(int argc, char *argv[])
     SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
 
 	bool quit = false;
+    bool window_visible;
     Uint32 lastUpdate = 0;
 	SDL_Event e;
 	while (!quit) {
@@ -78,7 +80,19 @@ int main(int argc, char *argv[])
 				}
 			} else if(e.type==SDL_MOUSEBUTTONUP){
                 stuff.mousedown=false;
-			}
+			} else if (e.type == SDL_WINDOWEVENT) {
+                if (e.window.event == SDL_WINDOWEVENT_MINIMIZED ||
+                        e.window.event == SDL_WINDOWEVENT_HIDDEN) {
+
+                    window_visible = false;
+                }
+                else if (e.window.event == SDL_WINDOWEVENT_SHOWN ||
+                        e.window.event == SDL_WINDOWEVENT_RESTORED ||
+                        e.window.event == SDL_WINDOWEVENT_FOCUS_GAINED) {
+
+                    window_visible = true;
+                }
+            }
             stuff.mx=e.button.x;
             stuff.my=e.button.y;
 		}
@@ -89,6 +103,10 @@ int main(int argc, char *argv[])
             mutVolume.locked=false;
         }
 
+        if(!window_visible){
+            SDL_Delay(50);
+            continue;
+        }
         Uint64 start = SDL_GetPerformanceCounter();
         //SDL_Log("vol: %f    avg: %f",stuff.volume,stuff.avg_peak);
         Uint32 current=SDL_GetTicks();
@@ -98,7 +116,11 @@ int main(int argc, char *argv[])
 
         Uint64 end = SDL_GetPerformanceCounter();
         float elapsedMS = (end - start) / (float)SDL_GetPerformanceFrequency() * 1000.0f;
-        SDL_Delay(floor(16.666f - elapsedMS));
+
+        elapsedMS=floor(16.666f - elapsedMS);
+        if (elapsedMS > 500) elapsedMS=500;
+        if (elapsedMS < 0) elapsedMS=0;
+        SDL_Delay(elapsedMS);
         //SDL_Delay(rand() % 25);
 	}