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According to opengl spec 4.0 glDrawPixels is deprecated.
For cuda interoperability it seems best to use "opengl buffer objects". (An alternative could be textures or surfaces but these have caching/concurrency issues and are therefore unusable for my cuda kernel).
I simply want to create a cuda kernel which uses this mapped opengl buffer object and uses it as a "pixel array" or a piece of memory holding pixels, later the buffer is unmapped.
I then want the opengl program to draw the buffer object to the framebuffer. I would like to use an opengl api which is not deprecated.
What other ways/apis are there to draw a buffer object to the frame buffer ? (Also render buffers cannot be used since they probably have same issue as cuda arrays/caching issues, so this rules out framebuffer object/extension ?!?).
Is there a gap/missing functionality in opengl 4.0 now that glDrawPixels is deprecated ? Or is there an alternative ?
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A Framebuffer is a collection of buffers that can be used as the destination for rendering. OpenGL has two kinds of framebuffers: the Default Framebuffer, which is provided by the OpenGL Context; and user-created framebuffers called Framebuffer Objects (FBOs).
Renderbuffer Objects are OpenGL Objects that contain images. They are created and used specifically with Framebuffer Objects. They are optimized for use as render targets, while Textures may not be, and are the logical choice when you do not need to sample (i.e. in a post-pass shader) from the produced image.
Framebuffers represent a collection of memory attachments that are used by a render pass instance. Examples of these memory attachments include the color image buffers and depth buffer that we created in previous samples. A framebuffer provides the attachments that a render pass needs while rendering.
Buffer Objects are OpenGL Objects that store an array of unformatted memory allocated by the OpenGL context (AKA the GPU). These can be used to store vertex data, pixel data retrieved from images or the framebuffer, and a variety of other things.
glDrawPixels has been removed from GL 3.2 and above (it is not deprecated. Deprecated means "available but to be removed in the future"). It was removed because it's generally not a fast way to draw pixel data to the screen.
Your best bet is to use glTexSubImage2D to upload it to a texture, then draw that to the screen. Or blit it from the texture with glBlitFramebuffer.
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