CODEWITHSUNDEEP
bindingopengl-estexturescompute-shader
markwalberg
markwalberg

Reputation: 321

glTexSubImage2D 1282 - invalid operation in gl es 3.1

I am trying to use:

layout (binding = 0, rgba8ui) readonly uniform uimage2D input;

in a compute shader. In order to to bind a texture to this I am using:

glBindImageTexture(0, texture_name, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);

and it seems that in order for this bind to work the texture has to be immutable so I've switched from:

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

to:

glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8UI, width, height);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

But this generates "Invalid operation" (specifically the glTexSubImage2D() call generates it). Looking in the documentation I discovered that this call may cause 1282 for the following reasons:

GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage2D or glCopyTexImage2D operation whose internalformat matches the format of glTexSubImage2D.

GL_INVALID_OPERATION is generated if type is GL_UNSIGNED_SHORT_5_6_5 and format is not GL_RGB.

GL_INVALID_OPERATION is generated if type is GL_UNSIGNED_SHORT_4_4_4_4 or GL_UNSIGNED_SHORT_5_5_5_1 and format is not GL_RGBA

but none of these is my case.

The first of them might seem to be the problem (considering I am using glTexStorage2D(), not glTexImage2D() )but this is not the problem because in case of float texture the same mechanism works:

glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA32F, width, height);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_FLOAT, pixels);

instead of:

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGBA, GL_FLOAT, pixels);

This is probably irrelevant but both methods work well on PC.

Any suggestions on why is this happening?

Upvotes: 0

Views: 2708

Answers (1)

246tNt
246tNt

Reputation: 2170

The internalFormat you use in glTexImage2D and glBindImageTexture should be the same and be compatible with your sampler. For a uimage2D, try using GL_RGBA8UI everywhere.

Also, for transfers to GL_RGBA8UI (and other integer formats) you need to use GL_RGBA_INTEGER as format.

glBindImageTexture(0, texture_name, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8UI);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8UI, width, height, 0, GL_RGBA_INTEGER, GL_UNSIGNED_BYTE, pixels);

Using the format GL_RGBA_INTEGER should also make the glTexSubImage2D variant work.

Upvotes: 2

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