Question

我有以下C代码（为清楚起见，我知道它不是完整的代码，它应该处理事件和类似的东西）：

#!/usr/bin/tcc -run -L/usr/lib/x86_64-linux-gnu -D_REENTRANT -DSDL_MAIN_HANDLED -I/usr/include/SDL2 -lSDL2 -lGL -lGLEW

#include <GL/glew.h>
#include <SDL.h>

int main(int argc, char **argv)
{
    SDL_Init(SDL_INIT_VIDEO);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

    SDL_Window *win = SDL_CreateWindow("Hello World!", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
    SDL_GLContext glContext = SDL_GL_CreateContext(win);

    while (1)
    {
        glClearColor(1, 0, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT);
        SDL_GL_SwapWindow(win);
    }

    SDL_GL_DeleteContext(glContext);
    SDL_DestroyWindow(win);

    return 0;
}

如果我用GCC编译它（没有shebang行），并启动可执行文件，它工作正常，但我喜欢TCC的编译和运行功能的简单性及其速度。

但是，编译后的可执行文件为我提供了以下控制台输出，然后永久挂起，甚至无法用CTRL-C杀死：

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

我按建议here添加了SDL_MAIN_HANDLED，但这并没有改变任何内容。

任何？

Answer 1

如何正确处理SDL调用的可能错误并初始化glew？

#include <stdlib.h>
#include <SDL.h>
#include <GL/glew.h>


void exit_sdl_error(const char *message) {
    SDL_LogCritical(SDL_LOG_CATEGORY_ERROR, "%s failed with SDL error %s", message, SDL_GetError());
    exit(EXIT_FAILURE);
}

int main() {
    const Uint32 init_flags = SDL_INIT_VIDEO;
    const int gl_major = 4, gl_minor = 0;
    if (!SDL_WasInit(init_flags)) {
        if (SDL_Init(init_flags) != 0)
            exit_sdl_error("Unable to initialize SDL");
        if (SDL_InitSubSystem(init_flags) != 0)
            exit_sdl_error("Unable to initialize sub system of SDL");
    }

    if (SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, gl_major))
        exit_sdl_error("Unable to set gl major version");
    if (SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, gl_minor))
        exit_sdl_error("Unable to set gl minor version");
    if (SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE))
        exit_sdl_error("Unable to set gl profile");


    SDL_Window *window = SDL_CreateWindow("Hello World!", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
    if (!window) {
        SDL_QuitSubSystem(init_flags);
        exit_sdl_error("Unable to create window");
    }

    SDL_GLContext glContext = SDL_GL_CreateContext(window);
    if (!glContext) {
        SDL_DestroyWindow(window);
        SDL_QuitSubSystem(init_flags);
        exit_sdl_error("Unable to create context");
    }

    glewInit();
    while (1)
    {
        glClearColor(1, 0, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT);
        SDL_GL_SwapWindow(window);
    }

    SDL_GL_DeleteContext(glContext);
    SDL_DestroyWindow(window);
    SDL_QuitSubSystem(init_flags);
}

基本的C SDL2程序不能与TCC一起工作，而它与GCC（Linux）一起工作

1 个答案: