我已经从 lwjgl.org 网页 ( http://www.lwjgl.org/guide ) 编译了入门示例,现在我想不断更改背景颜色。所以,我想要一些像闪烁效果的东西。但当程序运行时,我无法使用 glClearColor
使背景永久切换其颜色。
我尝试在 while 循环的 Loop() 函数中使用 glClearColor
执行此操作。但这似乎是错误的,因为 glClearColor
方法仅在 while 循环之外调用。例如,在以下代码中,背景颜色采用最后使用 glClearColor
调用的颜色。
...
private void loop() {
// This line is critical for LWJGL's interoperation with GLFW's
// OpenGL context, or any context that is managed externally.
// LWJGL detects the context that is current in the current thread,
// creates the ContextCapabilities instance and makes the OpenGL
// bindings available for use.
GLContext.createFromCurrent();
// Set the clear color
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
// Run the rendering loop until the user has attempted to close
// the window or has pressed the ESCAPE key.
while ( glfwWindowShouldClose(window) == GL_FALSE ) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
/* Switch permanently between red and green background color
- doesn't work, no blinking, just green background color */
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
glClearColor(0.0f, 1.0f, 0.0f, 0.0f);
glfwSwapBuffers(window); // swap the color buffers
// Poll for window events. The key callback above will only be
// invoked during this call.
glfwPollEvents();
}
}
...
我对 lwjgl 很陌生,因此我认为我犯了一些基本错误,背景颜色根本不应该以我所做的方式更改。是否有东西可以处理 lwjgl 中的背景来实现此目的?
我应该提到我正在使用lwjgl 3,而不是lwjgl 2。而且似乎不再有显示类了。 GLFW 似乎可以替代它。
最佳答案
在下面的 while 循环中,认为每次迭代代表您的 1 帧。在场景中,只有在每次迭代后调用 glfwPollEvents()
后,您才会看到变化。这就是为什么在一次迭代中改变颜色两次不会影响任何事情。
while ( glfwWindowShouldClose(window) == GL_FALSE ) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
/* Switch permanently between red and green background color
- doesn't work, no blinking, just green background color */
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
glClearColor(0.0f, 1.0f, 0.0f, 0.0f);
glfwSwapBuffers(window); // swap the color buffers
// Poll for window events. The key callback above will only be
// invoked during this call.
glfwPollEvents();
}
在下面,我为您的问题编写了一个简单的解决方案。如果你在每一帧都改变颜色,你就看不到变化,因为它会非常快,所以我做了一个小技巧,每 30 帧改变你的颜色。您可以使用时间相关的颜色变化而不是帧计数来编写替代方案。
正确版本:
boolean redOrGreen = true; // true = Green false = Red
int counter = 0;
int COLORCHANGEAT = 30;
while ( glfwWindowShouldClose(window) == GL_FALSE ) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
counter++;
if(counter == COLORCHANGEAT) {
redOrGreen = !redOrGreen;
counter = counter % COLORCHANGEAT;
}
if(redOrGreen == true)
glClearColor(1.0f, 1.0f, 0.0f, 0.0f);
else
glClearColor(0.0f, 1.0f, 0.0f, 0.0f);
glfwSwapBuffers(window); // swap the color buffers
// Poll for window events. The key callback above will only be
// invoked during this call.
glfwPollEvents();
}
关于java - 使用 lwjgl 让背景闪烁,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29717945/