iPhone 上的 OpenGL ES 1.1 纹理故障排除

发布于 2024-10-09 16:13:13 字数 180 浏览 0 评论 0原文

我试图将纹理绘制到屏幕外的帧缓冲区中，并且其渲染缓冲区始终最终完全空白（黑色）。奇怪的是，我知道上下文已设置，并且我正在使用 glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) 和 glGetError() 检查错误，但两个函数都没有说有任何问题。我可以调用任何其他错误检查函数来了解正在发生的情况吗？

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開玄 2024-10-16 16:13:13

如果没有更多信息，很难给你准确的答案。也许您可以发布一些有关渲染缓冲区的设置和使用的代码？

同时，这里有一些有关如何正确设置屏幕外帧缓冲区的信息：

// Remember the FBO being used for the display framebuffer
glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, (GLint *)&SystemFBO);

// Create the texture and the FBO for offscreen frame buffer
glGenTextures(1, &ResultTexture);
glBindTexture(GL_TEXTURE_2D, ResultTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glGenFramebuffersOES(1, &ResultFBO);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, ResultFBO);
glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, ResultTexture, 0);

glBindFramebufferOES(GL_FRAMEBUFFER_OES, ResultFBO);

// do your rendering to offscreen framebuffer
...

// restore original frame buffer object
glBindFramebufferOES(GL_FRAMEBUFFER_OES, SystemFBO);

// use ResultTexture as usual
glBindTexture(GL_TEXTURE_2D, ResultTexture);

希望这会有所帮助......

Difficult to give you a precise answer without more information. Perhaps could you post some code about your setup and usage of the render buffer?

In the meantime, here is some info about how to properly setup an offscreen framebuffer:

// Remember the FBO being used for the display framebuffer
glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, (GLint *)&SystemFBO);

// Create the texture and the FBO for offscreen frame buffer
glGenTextures(1, &ResultTexture);
glBindTexture(GL_TEXTURE_2D, ResultTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glGenFramebuffersOES(1, &ResultFBO);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, ResultFBO);
glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, ResultTexture, 0);

glBindFramebufferOES(GL_FRAMEBUFFER_OES, ResultFBO);

// do your rendering to offscreen framebuffer
...

// restore original frame buffer object
glBindFramebufferOES(GL_FRAMEBUFFER_OES, SystemFBO);

// use ResultTexture as usual
glBindTexture(GL_TEXTURE_2D, ResultTexture);

Hope this helps...

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