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Bug 3233 - OpenGLES graphics upside-down with texture render target
Summary: OpenGLES graphics upside-down with texture render target
Status: RESOLVED DUPLICATE of bug 3347
Alias: None
Product: SDL
Classification: Unclassified
Component: render (show other bugs)
Version: 2.0.4
Hardware: x86 Android (All)
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-01-10 11:55 UTC by Richard Russell
Modified: 2016-10-01 18:42 UTC (History)
0 users

See Also:

Attachments
Output rendered using opengles driver (33.18 KB, image/png)
2016-01-10 11:55 UTC, Richard Russell 		Details
Output rendered using opengles2 driver (33.15 KB, image/png)
2016-01-10 11:56 UTC, Richard Russell 		Details
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Description Richard Russell 2016-01-10 11:55:24 UTC 
Created attachment 2360 [details]
Output rendered using opengles driver

I am wanting to use OpenGLES (on Android) because I need 'glLogicOp' which is not available in OpenGLES2.  However if I force the use of OpenGLES all my graphics are rendered upside-down!  I am using a texture as my render target.

See the attached screenshots.  The only difference is that in one I use this hint and in the other I don't:

  SDL_SetHint (SDL_HINT_RENDER_DRIVER, "opengles") ;

I wonder if this is related to other bugs (e.g. 2700, 2740) which invert the y-coordinate when a render target is used.
Comment 1 Richard Russell 2016-01-10 11:56:26 UTC 
Created attachment 2361 [details]
Output rendered using opengles2 driver
Comment 2 Richard Russell 2016-01-10 16:16:56 UTC 
Functions affected by this bug include SDL_RenderFillRect, SDL_RenderDrawPoint, SDL_RenderDrawPoints, SDL_RenderDrawLine and SDL_RenderDrawLines.

I can't write a patch because the y-coordinates need to be inverted with respect to the height of the target texture (not the window) and I don't know how to discover that.
Comment 3 Sam Lantinga 2016-10-01 18:42:09 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/16bfa598c1d6

*** This bug has been marked as a duplicate of bug 3347 ***