OpenGLES 3.0 无法渲染大于屏幕尺寸的纹理
我在下面制作了一张图片来表明我的问题。我将场景渲染到屏幕外的帧缓冲区，其纹理大小与屏幕相同。然后，我将所述纹理渲染到填充屏幕的四边形。这会产生图像上的情况 1。然后我运行完全相同的程序，但纹理大小比方说大 1.5 倍（足以包含整个笑脸），然后再次将其渲染到屏幕填充四边形。然后我得到结果 3，但我期望得到结果 2。
我记得在渲染到纹理之前根据新的纹理大小更改视口，并在绘制四边形之前重置视口。我不明白，我做错了什么。
总而言之，这是一般流程（代码太多，无法发布全部）：
- 创建
MSAAframebuffer和ResolveFramebuffer（Resolve 包含纹理）。 - 设置
glViewport(0, 0, Width*1.5, Height*1.5) - 绑定
MSAAframebuffer并渲染我的场景（笑脸）。 - 将
MSAAframebufferBlit 到ResolveFramebuffer - 设置
glViewport(0, 0, Width, Height)，绑定纹理并渲染我的四边形。
请注意，所有 MSAA 都工作得很好。而且两个缓冲区都具有相同的尺寸，所以当我blit时它很简单：glBlitFramebuffer(0, 0, Width*1.5, Height*1.5, 0, 0, Width*1.5, Height*1.5, ClearBufferMask.ColorBufferBit, BlitFramebufferFilter .Nearest）
希望有人有一个好主意。如果不这样做我可能会被解雇:D
I have made an image below to indicate my problem. I render my scene to an offscreen framebuffer with a texture the size of the screen. I then render said texture to a screen-filling quad. This produces the case 1 on the image. I then run the exact same program, but with with a texture size, let's say, 1.5 times greater (enough to contain the entire smiley), and afterwards render it once more to the screen-filling quad. I then get result 3, but I expected to get result 2.
I remember to change the viewport according to the new texture size before rendering to the texture, and reset the viewport before drawing the quad. I do NOT understand, what I am doing wrong.
To summarize, this is the general flow (too much code to post it all):
- Create
MSAAframebufferandResolveFramebuffer(Resolve contains the texture). - Set
glViewport(0, 0, Width*1.5, Height*1.5) - Bind
MSAAframebufferand render my scene (the smiley). - Blit the
MSAAframebufferinto theResolveFramebuffer - Set
glViewport(0, 0, Width, Height), bind the texture and render my quad.
Note that all the MSAA is working perfectly fine. Also both buffers have the same dimensions, so when I blit it is simply: glBlitFramebuffer(0, 0, Width*1.5, Height*1.5, 0, 0, Width*1.5, Height*1.5, ClearBufferMask.ColorBufferBit, BlitFramebufferFilter.Nearest)
Hope someone has a good idea. I might get fired if not :D
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我发现我实际上在代码中的其他地方使用了 AABB 来确定要渲染的内容；这个 AABB 是根据“小视口的大小”计算的。愚蠢的错误。
I found that I actually used an AABB somewhere else in the code to determine what to render; and this AABB was computed from the "small viewport's size". Stupid mistake.