CODEWITHSUNDEEP
webglopengl-es-2.0
graphics123
graphics123

Reputation: 1271

What is the difference between glframebuffertexture2d and glTexSubImage2d

I have already used glTexSubImage2d and I know that it helps in filling images(texture) partly, but can we use glframebuffertexture2d to increase some performance. Or simply what is the difference and which one is recommended to use ?

Upvotes: 2

Views: 673

Answers (1)

user128511
user128511

Reputation:

glTexSubImage2D copies some data to a sub-rectangle of a texture

glFramebufferTexture2D attaches a texture to a framebuffer

The 2 functions are completely unrelated and are used for completely different purposes.

A framebuffer is a collection of attachments that you can render to (assuming your gpu/driver supports the combination of attachments you've attached. You can find out if they are supported by making a framebuffer, attaching things to it, then calling glCheckframebufferStatus. If it returns GL_FRAMEBUFFER_COMPLETE then you can render to that combination of attachments

One you've done that you can render to that framebuffer (effectively rendering into its attachments). Whether that's faster than uploading data is up to you. It really depends on your data. Framebuffers are normally used to generate textures at runtime for things like shadows, environment maps, various data for post processing effects, etc...

Upvotes: 1

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