GL_TRIANGLES有效,但GL_QUADS不显示任何内容

时间:2017-10-02 07:36:22

标签: opengl vbo vao

所以我从一个程序换到另一个程序,但我无法弄清楚为什么,但GL_QUADS将不再显示相同的代码。为了弄清楚为什么旧代码不起作用,我创建了这个新的,简单的代码,它仍然不起作用。

设置:

vector <vec3f> squarepoints;
vec3f temper(-0.5f, 0.5f, 0.5f);
squarepoints.push_back(temper);
temper.x += 1.0f;
squarepoints.push_back(temper);
temper.y -= 1.0f;
squarepoints.push_back(temper);
temper.x -= 1.0f;
squarepoints.push_back(temper);
vector <unsigned int> squareindex;
squareindex.push_back(0);
squareindex.push_back(1);
squareindex.push_back(2);
//squareindex.push_back(0);
//squareindex.push_back(2);
squareindex.push_back(3);
GLuint VAOO;
GLuint IBOO;
GLuint VBOO;


glGenVertexArrays(1, &VAOO);
glBindVertexArray(VAOO);

glGenBuffers(1, &VBOO);
glBindBuffer(GL_ARRAY_BUFFER, VBOO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vec3f) * squarepoints.size(), &squarepoints[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT,GL_FALSE, 0, 0);       


glGenBuffers(1, &IBOO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, IBOO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * squareindex.size(), &squareindex[0], GL_STATIC_DRAW);
glBindVertexArray(0);

图纸:

glBindVertexArray(VAOO);
    glDrawElements(GL_QUADS, squareindex.size(), GL_UNSIGNED_INT, 0);
    glBindVertexArray(0);

这没有任何显示。现在,如果我在设置中添加两条注释行以使其为6点并将其更改为图形中的GL_TRIANGLES,则它们都会完美显示。我不知道故障在哪里,但我一直试图修复我的模型加载和其他功能,以至于我确定我只是忽略了一些非常明显的东西。

1 个答案:

答案 0 :(得分:4)

来自核心OpenGL 3.1及更高版本的GL_QUADS have been removed