我目前正在尝试使用 C 来关闭 OpenGL。我有当前代码:
#include <stdio.h>
#include <stdlib.h>
#define null (void*)0
#define GL3_PROTOTYPES 1
#include <GL/gl3.h>
#include <SDL.h>
#define PROGRAM_NAME "Tutorial1"
void sdldie(const char *msg)
{
printf("%s: %s\n", msg, SDL_GetError());
SDL_Quit();
exit(1);
}
void checkSDLError(int line)
{
#ifndef NDEBUG
const char *error = SDL_GetError();
if(*error != '\0')
{
printf("SDL Error: %s\n", error);
if(&line != null)
printf(" + line: %i\n", line);
SDL_ClearError();
}
#endif
}
int main(int argc, char *argv[])
{
SDL_Window *mainwindow; //window handle
SDL_GLContext maincontext; //opengl context handle
if(SDL_Init(SDL_INIT_VIDEO) < 0)//initialize video subsystem
sdldie("Unable to initialize SDL"); //DIE ON ERROR
//request OGL 3.2 context (default to SDL core profile)
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
//turn on double buffering with a 24 bit Z buffer
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
mainwindow = SDL_CreateWindow(PROGRAM_NAME, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
512, 512, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
if(!mainwindow)
sdldie("Unable to create window");
checkSDLError(__LINE__);
//create an opengl context and attach it to the window
maincontext = SDL_GL_CreateContext(mainwindow);
checkSDLError(__LINE__);
//VSync, turn it off later
SDL_GL_SetSwapInterval(1);
//clear buffer with red background
glClearColor(1.0,0.0,0.0,1.0);
glClear(GL_COLOR_BUFFER_BIT);
//swap back buffer to the front
SDL_GL_SwapWindow(mainwindow);
//wait 2 secs
SDL_Delay(2000);
//repeat with green
glClearColor(0.0,1.0,0.0,1.0);
glClear(GL_COLOR_BUFFER_BIT);
//swap back buffer to the front
SDL_GL_SwapWindow(mainwindow);
//wait 2 secs
SDL_Delay(2000);
//delete all dis shit
SDL_GL_DeleteContext(maincontext);
SDL_DestroyWindow(mainwindow);
SDL_Quit();
return 0;
}
请注意我们选择 OGL 版本的那一行(在 main 中,在初始化视频之后)...当我按照此处的代码执行此操作时,我会遇到错误:
X Error of failed request: GLXBadFBConfig
Major opcode of failed request: 154 (GLX)
Minor opcode of failed request: 34 ()
Serial number of failed request: 166
Current serial number in output stream: 165
造成这种情况的行具体是:
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
当它被注释掉时,一切正常(但可能与另一个 OGL 版本 D:)
我正在使用最新版本的 FOSS Radeon 驱动程序(在 Arch 上)、SDL2.0 HG 版本、最新的稳定 GLX 和 gl3.h 已手动下载...在 arch linux 和 gcc 版本 4.7.2
知道为什么会发生这种情况(/如何摆脱它)吗?设置该属性是否必要?