glbegin无法在OpenGL 3.3核心中绘制 [英] glbegin doesn't draw in OpenGL 3.3 core

问题描述

我需要绘制一个立方体以指示OpenGL 3.3核心配置文件中的坐标.在没有glutInitContextVersion (3, 3);的情况下它可以正常工作，但是在应用glutInitContextVersion (3, 3);时它会变成全黑. 这是绘图代码.

I need to draw a cube to indicate coordinate in OpenGL 3.3 core profile.It works fine without glutInitContextVersion (3, 3); but it becomes totally black when glutInitContextVersion (3, 3); applied. Here is the drawing code.

void display() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear color and depth buffers
glMatrixMode(GL_MODELVIEW);     // To operate on model-view matrix

// Render a color-cube consisting of 6 quads with different colors
glLoadIdentity();                 // Reset the model-view matrix
glTranslatef(1.5f, 0.0f, -7.0f);  // Move right and into the screen

glBegin(GL_QUADS);                // Begin drawing the color cube with 6 quads
  // Top face (y = 1.0f)
  // Define vertices in counter-clockwise (CCW) order with normal pointing out
  glColor3f(0.0f, 1.0f, 0.0f);     // Green
  glVertex3f( 1.0f, 1.0f, -1.0f);
  glVertex3f(-1.0f, 1.0f, -1.0f);
  glVertex3f(-1.0f, 1.0f,  1.0f);
  glVertex3f( 1.0f, 1.0f,  1.0f);

  // Bottom face (y = -1.0f)
  glColor3f(1.0f, 0.5f, 0.0f);     // Orange
  glVertex3f( 1.0f, -1.0f,  1.0f);
  glVertex3f(-1.0f, -1.0f,  1.0f);
  glVertex3f(-1.0f, -1.0f, -1.0f);
  glVertex3f( 1.0f, -1.0f, -1.0f);

  // Front face  (z = 1.0f)
  glColor3f(1.0f, 0.0f, 0.0f);     // Red
  glVertex3f( 1.0f,  1.0f, 1.0f);
  glVertex3f(-1.0f,  1.0f, 1.0f);
  glVertex3f(-1.0f, -1.0f, 1.0f);
  glVertex3f( 1.0f, -1.0f, 1.0f);

  // Back face (z = -1.0f)
  glColor3f(1.0f, 1.0f, 0.0f);     // Yellow
  glVertex3f( 1.0f, -1.0f, -1.0f);
  glVertex3f(-1.0f, -1.0f, -1.0f);
  glVertex3f(-1.0f,  1.0f, -1.0f);
  glVertex3f( 1.0f,  1.0f, -1.0f);

  // Left face (x = -1.0f)
  glColor3f(0.0f, 0.0f, 1.0f);     // Blue
  glVertex3f(-1.0f,  1.0f,  1.0f);
  glVertex3f(-1.0f,  1.0f, -1.0f);
  glVertex3f(-1.0f, -1.0f, -1.0f);
  glVertex3f(-1.0f, -1.0f,  1.0f);

  // Right face (x = 1.0f)
  glColor3f(1.0f, 0.0f, 1.0f);     // Magenta
  glVertex3f(1.0f,  1.0f, -1.0f);
  glVertex3f(1.0f,  1.0f,  1.0f);
  glVertex3f(1.0f, -1.0f,  1.0f);
  glVertex3f(1.0f, -1.0f, -1.0f);
glEnd();  // End of drawing color-cube


glutSwapBuffers();  // Swap the front and back frame buffers (double buffering)
}

这是主要功能中的代码:

Here is the code in main function:

int main(int argc, char** argv) {
glutInit(&argc, argv);            // Initialize GLUT
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); // Enable double buffered mode
glutInitContextVersion (3, 3);
glutInitWindowSize(640, 480);   // Set the window's initial width & height
glutInitWindowPosition(50, 50); // Position the window's initial top-left corner
glutCreateWindow(title);          // Create window with the given title
glutDisplayFunc(display);       // Register callback handler for window re-paint event
glutReshapeFunc(reshape);       // Register callback handler for window re-size event
initGL();                       // Our own OpenGL initialization
glutMainLoop();                 // Enter the infinite event-processing loop
return 0;
}

如何在OpenGL 3.3核心配置文件中绘制立方体?

How to draw a cube in OpenGL 3.3 core profile?

推荐答案

glBegin和朋友已弃用，并从较新版本(3.2及更高版本)中删除.

glBegin and friends are deprecated and removed from the newer versions (3.2 onward).

相反，您需要将顶点数据上传到顶点缓冲对象".然后使用glVertexAttribPointer告诉openGL数据的布局方式.

Instead you need to upload the vertex data to Vertex Buffer Objects. Then use glVertexAttribPointer to tell openGL how the data is laid out.

此外，您还需要编写着色器.

Besides that you need to write shaders.

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