OpenGL GLFW程序运行白屏+加载光标，窗口无响应问题求助

Hey there! Let's break down why your sphere project is stuck on a white screen and going unresponsive. Since you adapted quad-shading code for a sphere, there are a handful of common missteps that could be causing this:

Common Culprits & Fixes #

• Infinite loops or broken geometry generation
  If you're generating sphere vertices on the CPU, a messed-up loop (like incorrect iteration bounds, or a recursive logic bug) will lock up your program immediately. Double-check your latitude/longitude segment loops—did you accidentally set a segment count to 10000 instead of 100? Or use while (i <= max) when you meant i < max? Also, verify your generated vertex/triangle count makes sense (e.g., 30x30 segments should give ~900 vertices and ~1700 triangles).

• Uncaught shader compilation/linking errors
  Switching from a quad to a sphere means your vertex data moves from 2D to 3D—if you didn't update your glVertexAttribPointer calls to match the new 3D vertex layout, your shader won't receive valid data. Worse, if you're not checking for shader errors, you might be running with a broken shader that outputs nothing but white.
  Add these checks right after compiling/linking:

  // Check shader compilation
  GLint success;
  char infoLog[512];
  glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
  if (!success) {
      glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
      std::cout << "VERTEX SHADER COMPILATION FAILED:\n" << infoLog << std::endl;
  }
  // Check program linking
  glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
  if (!success) {
      glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
      std::cout << "PROGRAM LINKING FAILED:\n" << infoLog << std::endl;
  }
  

• Broken OpenGL state or glad setup
  Since you downgraded to 3.3 and used glad, make sure glad is properly initialized before any OpenGL calls. If functions like glDrawArrays or glBindVertexArray aren't loaded correctly, you'll get undefined behavior (including a frozen window). Also, confirm you're binding the right VAO/VBO before drawing—if the GPU can't access your sphere's vertex data, it'll render nothing.

• Invalid draw calls
  OpenGL 3.3 deprecated GL_QUADS, so if you're still using that primitive type for your sphere, the GPU can't parse your geometry. Switch to GL_TRIANGLES or GL_TRIANGLE_STRIP instead. Also, double-check that the vertex count you pass to glDrawArrays/glDrawElements matches exactly the number of vertices you generated.

Quick Debugging Steps #

1. Simplify your shader first: Temporarily replace your color-alternating logic with a fixed color output (e.g., gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);). If you see a red sphere, the problem is in your color logic; if not, focus on geometry or OpenGL state.
2. Pause after vertex generation: Add a getchar() or debug breakpoint right after generating your sphere's vertices. If the program gets stuck here, you've got a loop bug.
3. Validate draw calls: Print the number of vertices/triangles you're trying to draw—if the number is way too high or zero, that's a red flag.

内容的提问来源于stack exchange，提问作者Folaranmi Ogunfemi