sdl-2

问题 So I've been playing around with SDL2 to see if it would suit my needs. I was following introductory examples (from lazyfoo mostly) and made a simple test. #include <stdio.h> #include <SDL.h> const int SCREEN_WIDTH = 640; const int SCREEN_HEIGHT = 480; int main(int argc, char const *argv[]) { /* The window handle */ SDL_Window* window = NULL; /* The surface contained in the window */ SDL_Surface* screen_surface = NULL; /* Init SDL */ if(SDL_Init(SDL_INIT_VIDEO) < 0) { printf("SDL could not

问题 I start to learn CMake. I want to build my application with SDL2 library using MinGW w64. I generate Makefiles and use mingw32-make for building my app. But my app doesn't execute without any messages (my OS is Windows 10). First about I thought that my app doesn't see it dependecies. I try to use DependencyWalker and figure out next. My app doesn't see libriries like API-MS-WIN-CORE-APIQUERY-L1-1-0.DLL API-MS-WIN-CORE-APPCOMPAT-L1-1-0.DLL API-MS-WIN-CORE-APPCOMPAT-L1-1-1.DLL API-MS-WIN-CORE

问题 I am trying to make a 2d-map editor. Now if my map is finish I want to save it. I tried this: IMG_SavePNG(SDL_GetWindowSurface(window), "C:/Users/<MY_NAME>/Desktop"); but nothing happens. No image get saved and also no error. Here is the creation of my window: SDL_Window* window = SDL_CreateWindow("Famonex", 100, 100, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE); Here are my includes: #include <SDL.h> #include <SDL_image.h> #include <SDL_mixer.h> 回答1: Damn I just

问题 I am trying to create a process with two windows. Each window has a different thread for drawing. The problem is that when I run the program, after a random amount of time something goes wrong and gives me a segmentation fault. Here is my code: main.cpp std::thread *thr1 = new std::thread(thread_func); std::thread *thr2 = new std::thread(thread_func); thread.cpp: Window *win = new Window(display_name, 1024, 768); Renderer *rend = win->CreateRenderer(); Texture *pic = new Texture(rend, path);

问题 CASE 1 arm-linux-gcc -v hello.c ==> WORKS CASE 2 arm-linux-gcc -v -L/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/staging/usr/lib hello.c ==> DOESN'T WORK ERROR:ld.bfd: cannot find /usr/lib/libc_nonshared.a ERROR:ld.bfd: cannot find /lib/ld-linux.so.3 CASE 3 arm-linux-gcc -v --sysroot=/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot/ hello.c ==>WORKS but says it is ignoring sysroot because it cannot find /usr

问题 I'm currently using a for loop to create 4 rectangles along the x-axis. When I run the program the image of the rectangle appears for a few millisecond before it disappears. Can you show me what I have to do in order for the image to display on the screen permanently. When I create individual rectangles it display's the image without vanishing. An example will be helpful. Thanks int main(){ int barrack1_xposition = 167,i=1; int cnt_barrack=0; SDL_Window *o = NULL; SDL_Renderer *r = NULL; SDL

问题 I'm using SDL in VS2013 and I'm trying to load an image from the folder that my working directory should be using a relative path. Which is where the .vcxproj files are. However I discovered that the working directory is not the folder it should be, it is actually in C:\Windows\System32. I have realised that this is only the case when I go to linker, system and then change the subsystem to CONSOLE. In a WINDOWS subsystem it uses the correct working directory. Why is this happening and how do

问题 I am trying to run my sd l game on Android, I followed lazyfoo's tutorial to run the helloworld , which worked fine, later I imported my project, this project source works fine in windows without any error, but I am now seeing many errors in my files, I am new to android , I feel I have messed up with path's to my source files. below is the error: Android.mk (inside src dir): LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := main SDL_PATH := ../SDL2 LOCAL_C_INCLUDES := $

问题 I'm making a small "retro-style" 2D platformer game with SDL in C++. I figured that the best way to keep the game at a low resolution, while allowing people with different size monitors to stretch the game window to fit their setup, would be to render everything to a low-res texture and then render that texture to the whole window (with the window size/resolution set by the user). When I run this setup, the game works exactly as it should and renders fine (in both fullscreen and windowed

问题 I have a SDL2 program that works perfectly. But from time to time, when I compile, execute and close several times my program, it slows drastically when calling SDL_Init(). I can still see my console, but it is just very slow and needs 5 minutes to resume. It happens when I use "SDL_INIT_EVERYTHING" as a flag. But after 5 minutes, it runs the program smoothly. But when I use "SDL_INIT_VIDEO | SDL_INIT_EVENTS" as a flag, the program freezes when calling SDL_PollEvent() instead of SDL_Init(). I