Question

我正在使用OpenGL创建一个游戏并且SDL_PollEvent没有拾取所有事件的问题，例如，如果我按住一个键，我必须等待~1-3秒，然后程序才能实现我所拥有的完成。这是我的 main.cpp ：

unsigned char command[] = {0x1B, 0x2A, 0x72, 0x44, 0x01, 0x00};
uint bytesWritten = 0;
StarPrinterStatus_2 starPrinterStatus;
SMPort *port = nil;
@try
{
    port = [SMPort getPort:@"BT:" :@"" :10000];
    //Start checking the completion of printing
    [port beginCheckedBlock:&starPrinterStatus :2];
    if (starPrinterStatus.offline == SM_TRUE)
    {
        //There was an error writing to the port
    }
    while (bytesWritten < sizeof (command)) {
        bytesWritten += [port writePort: command : bytesWritten : sizeof (command) - bytesWritten];
    }
    //End checking the completion of printing
    [port endCheckedBlock:&starPrinterStatus :2];
    if (starPrinterStatus.offline == SM_TRUE)
    {
        //There was an error writing to the port
    }
}
@catch (PortException)
{
    //There was an error writing to the port
}
@finally
{
    [SMPort releasePort:port];
}

所有功能都按照他们的名字命名并正常工作。

编辑：

我已完成一些测试并删除了#include <GL/glew.h> #include <GL/GL.h> #include <SDL\SDL.h> #include "Display.h" #include "Mesh.h" #include "Shader.h" #include "Texture.h" #include "Transform.h" #include "Camera.h" #include <iostream> #define WIDTH 800 #define HEIGHT 600 int main(int argc, char *argv[]) { Display Display(800, 600, "OpenGL"); Vertex vertices[] = { Vertex(glm::vec3(-0.5, -0.5, 0), glm::vec2(0.0, 0.0)), Vertex(glm::vec3(0, 0.5, 0), glm::vec2(0.5, 1.0)), Vertex(glm::vec3(0.5, -0.5, 0), glm::vec2(1.0, 0.0)), }; unsigned int indices[] = { 0,1,2 }; SDL_Init(SDL_INIT_EVERYTHING); // Mesh Car("./res/Test2.obj"); // Mesh Test(vertices, sizeof(vertices) / sizeof(vertices[0]), indices, sizeof(indices)/sizeof(indices[0])); Mesh Ground("./res/Ground2.obj"); Shader shader("./res/basicShader"); // Texture texture("./res/CarUV.png"); Texture test("./res/ground.jpg"); Camera camera(glm::vec3(0, 0, -14), 70.f, (float)WIDTH / (float)HEIGHT, 0.01f, 1000.0f); Transform transform; const Uint8 *keyState; transform.GetPos().x = 0; transform.GetPos().y = 0; transform.GetPos().z = 0; transform.GetRot().x = 80; transform.GetRot().y = 0; transform.GetRot().z = 0; float counter = 0.0f; while (!Display.IsClosed()) { Display.Clear(0.0f, 0.15f, 0.3f, 1.0f); float sinCounter = sinf(counter); float cosCounter = cosf(counter); SDL_Event ev; while (SDL_PollEvent(&ev) != 0) { keyState = SDL_GetKeyboardState(NULL); if (keyState[SDL_SCANCODE_W]) { camera.MoveForward(1); std::cout << "keypress" << std::endl; } else if (keyState[SDL_SCANCODE_S]) { camera.MoveBackward(1); } if (keyState[SDL_SCANCODE_A]) { camera.MoveRight(1); } else if (keyState[SDL_SCANCODE_D]) { camera.MoveLeft(1); } if (keyState[SDL_SCANCODE_Y]) { camera.RotateY(0.1); } if (keyState[SDL_SCANCODE_X]) { camera.RotateX(0.1); } } //transform.SetScale(glm::vec3(cosCounter, cosCounter, cosCounter)); shader.Bind(); test.Bind(0); shader.Update(transform, camera); //Car.draw(); Ground.draw(); Display.Update(); counter += 1.0f; } return 0; }和Display.clear();修复了问题，但这不是一个可行的解决方案。

编辑2：

就像程序最初工作的额外信息一样，然后我开始摆弄它并且事件处理程序搞砸了。

Answer 1

正如@HolyBlackCat在评论中所说，在这部分代码中：

while (SDL_PollEvent(&ev) != 0)
{
    //if statements here 
}

while循环是不必要的，因为你已经有了以下形式的循环：

while (!Display.IsClosed())
{
    //main game loop
}

在内部使用另一个while循环只会导致问题。

无论如何希望这会有所帮助，请不要将其标记为答案 @HolyBlackCat创建一个或这个不适合你。欢呼声。

SDL_PollEvent没有响应事件

1 个答案: