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3b / cl-opengl

cl-opengl is a set of CFFI bindings to the OpenGL, GLU and GLUT APIs.
http://common-lisp.net/project/cl-opengl/
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glTextureSubImage3d invalid pixel types #93

Closed mfiano closed 4 years ago

mfiano commented 4 years ago

The GL documentation specifies the following for glTextureSubImage3d:

type Specifies the data type of the pixel data. The following symbolic values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, and GL_UNSIGNED_INT_2_10_10_10_REV.

However I'm experiencing a few problems. For Direct State Access, to upload a cube map is a bit strange -- you're required to use glTextureStorage2d first, and then glTextureSubImage3d to upload each face as if it were a layer of a 2d texture array. The strange part is you must allocate storage with the 2d storage call, and fill it with the 3d call, unlike a 2d texture array.

Anyway, doing this works fine, assuming I am uploading :unsigned-byte data. My cube maps have 4 bytes per pixel, and when using any of the more advanced pixel types to try to get that data on the GPU, I receive the following errors:

:unsigned-int-8-8-8-8 OpenGL signalled (1282 . INVALID-OPERATION) from TEXTURE-SUB-IMAGE-3D. This one is strange. It's producing an invalid operation error, which is supposed to indicate that the texture does not yet exist, even though I previously allocated it with glTextureStorage2d.

:unsigned-int-8-8-8-8-rev :UNSIGNED-INT-8-8-8-8-REV is not defined as a keyword for enum type #<CFFI::FOREIGN-ENUM CL-OPENGL-BINDINGS::PIXEL-TYPE>.

:unsigned-int-10-10-10-2 OpenGL signalled (1282 . INVALID-OPERATION) from TEXTURE-SUB-IMAGE-3D. Again, strange like :unsigned-int-8-8-8-8.

:unsigned-int-2-10-10-10-rev :UNSIGNED-INT-2-10-10-10-REV is not defined as a keyword for enum type #<CFFI::FOREIGN-ENUM CL-OPENGL-BINDINGS::PIXEL-TYPE>.

I am unable to upload a 32bpp cubemap face at all. This may be related to #92 since I am on that branch.

Additionally, I have a related issue not related to cl-opengl, but the specification itself. Because of the new way to upload cubemaps with DSA using glTextureStorage2d and glTextureSubImage3d, I am unable to upload :rgb9-e5/:unsigned-int-5-9-9-9-rev at all, because :unsigned-int-5-9-9-9-rev is not a valid pixel type for glTextureSubImage3d at all. Advice needed :)

3b commented 4 years ago

from irc discussion, it seems like the invalid-operation errors were user error, and :unsigned-int-5-9-9-9-rev should be supported according to spec, so that's a bug in man pages. Remaining "not defined as a keyword" errors are #92, so closing this.