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Bug 1589

Summary: Creating a Texture for image of size 64x64 doesn't quite work
Product: SDL Reporter: Pallav Nawani <pallavnawani>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2 CC: adam, icculus
Version: HG 2.0Keywords: triage-2.0.4
Hardware: x86_64   
OS: Mac OS X 10.7   
Attachments: test app

Description Pallav Nawani 2012-08-30 04:54:12 UTC 
What: Trying to create a texture for image of size 64x64. Image of size 65x65 works fine.
Problem: Texture is created but it isn't visible, we have to do SDL_UpdateTexture() to get it to show itself.

Following piece of code in SDL_render_gl.c (Lines 574-583) seems to be the culprit:

    if (texture->access == SDL_TEXTUREACCESS_STREAMING
        && texture->format == SDL_PIXELFORMAT_ARGB8888
        && (texture->w % 8) == 0) {
        renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
        renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,
                          (data->pitch / SDL_BYTESPERPIXEL(texture->format)));
        renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
                                 texture_h, 0, format, type, data->pixels);
        renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_FALSE);

Commenting this code seems to solve the problem.
Comment 1 Sam Lantinga 2012-09-28 02:48:26 UTC 
Do you have a simple test case?  Maybe something adapted from the programs in the test directory?

Thanks!
Comment 2 Adam M. 2014-05-10 03:09:42 UTC 
Is this only for Mac OS X? If not, it seems like a very serious bug.
Comment 3 Pallav Nawani 2014-05-10 10:38:28 UTC 
It has been quite some time since I worked on this, so I cannot quite recall the issue. It was for Mac OSX only, caused by the use of some apple specific extensions.
Comment 4 Sam Lantinga 2014-05-10 19:50:04 UTC 
Still waiting for a test case... ?
Comment 5 Ryan C. Gordon 2015-02-19 05:22:22 UTC 
Marking a large number of bugs with the "triage-2.0.4" keyword at once. Sorry if you got a lot of email from this. This is to help me sort through some bugs in regards to a 2.0.4 release. We may or may not fix this bug for 2.0.4, though!
Comment 6 Ryan C. Gordon 2015-02-21 06:41:31 UTC 
Going to try to reproduce this here.

--ryan.
Comment 7 Ryan C. Gordon 2015-02-21 23:36:15 UTC 
Created attachment 2040 [details]
test app


I couldn't reproduce this (but it's possible we fixed it since 2012).

I'm attaching my test case. This works if TEXTURESIZE is 64.

--ryan.
Comment 8 Ryan C. Gordon 2015-02-21 23:47:33 UTC 
Anyhow, marking this as FIXED. If this is still a problem (or my test case is incorrect!), reopen and we'll investigate further.

Thanks,
--ryan.