我在使用SDL2 / Opengl时遇到了一些麻烦 . 我只想知道我是否可以使它工作,但这个基本代码没有运行:
text.cpp:
#define GL_GLEXT_PROTOTYPES
#define GL3_PROTOTYPES 1
#include "glcorearb.h"
#include <SDL2/SDL.h>
#include <iostream>
int main(int argc, char **argv)
{
SDL_Window* fenetre(0);
SDL_GLContext contexteOpenGL(0);
SDL_Event evenements;
bool terminer(false);
// Init SDL
if(SDL_Init(SDL_INIT_VIDEO) < 0)
{
std::cout << "Erreur lors de l'initialisation de la SDL : " << SDL_GetError() << std::endl;
SDL_Quit();
return -1;
}
// OpenGL Version
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
// Double Buffer
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
// Window create
fenetre = SDL_CreateWindow("Test SDL 2.0", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_OPENGL);
if(fenetre == 0)
{
std::cout << "Erreur lors de la creation de la fenetre : " << SDL_GetError() << std::endl;
SDL_Quit();
return -1;
}
// OpenGL context
contexteOpenGL = SDL_GL_CreateContext(fenetre);
if(contexteOpenGL == 0)
{
std::cout << SDL_GetError() << std::endl;
SDL_DestroyWindow(fenetre);
SDL_Quit();
return -1;
}
float vertices[] = {-0.5, -0.5, 0.0, 0.5, 0.5, -0.5};
// Main loop
while(!terminer)
{
SDL_WaitEvent(&evenements);
if(evenements.window.event == SDL_WINDOWEVENT_CLOSE)
terminer = true;
// Clear
glClear(GL_COLOR_BUFFER_BIT);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, vertices);
glEnableVertexAttribArray(0);
// Triangle Display
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
// Update
SDL_GL_SwapWindow(fenetre);
}
// On quitte la SDL
SDL_GL_DeleteContext(contexteOpenGL);
SDL_DestroyWindow(fenetre);
SDL_Quit();
return 0;
}
这是一个来自教程here的程序,但是当我运行它时,我juste有一个黑屏 . 任何的想法?谢谢 .
1 回答
将
SDL_GL_CONTEXT_PROFILE_MASK
设置为SDL_GL_CONTEXT_PROFILE_CORE,因为您需要创建核心配置文件上下文 .在使用
glVertexAttribPointer
之类的函数之前有关如何设置VAO,顶点和片段着色器的信息,请参见this tutorial . 由于您只有2D点作为顶点着色器的输入,而教程具有3D点,因此将顶点着色器更改为: