Simon Hug
The GL_SetBlendMode and GLES_SetBlendMode functions of the opengl and opengles renderers call the glTexEnvf to set the texture env mode to either GL_MODULATE (the default) or GL_REPLACE for the NONE blend mode. Using GL_REPLACE disables color and alpha modulation for textures.
These glTexEnv calls were put in the SetBlendMode function back in 2006 [1], but there the NONE code still used the GL_DECAL mode. The GL_REPLACE mode came in 2008 [2]. I'm a bit confused why that wasn't always GL_MODULATE and a bit surprised nobody reported that yet (unless I missed it). I guess only a few use the gles renderer and the newish shaders mask the issue.
Simon Hug
The GL_CreateTexture function doesn't have any checks for the case where the driver doesn't support the framebuffer object extension. It will call into GL_GetFBO which will call the non-existent glGenFramebuffersEXT.
Also, for some reason GL_CreateContext always sets the SDL_RENDERER_TARGETTEXTURE info flag, even if it is not supported. Changeset cc226dce7536 [1] makes this change, but doesn't explain why. It seems to me like the code would already have taken care of this [2].
The attached patch adds some checks and stops SDL from reporting render target support if there is none. The application can then properly inform the user instead of just crashing.
Simon Hug
When the SDL_Blit_Slow function compares the pixel to the color key it does so without removing the alpha component from the pixel value and the key. This is different from the optimized 32-bit blitters which create a rgb mask and apply it to both to filter the alpha out. SDL_Blit_Slow will only skip the pixels with the exact alpha value of the key instead of all pixels with the same color.
The attached test case blits a surface with a color key and prints the pixel values to the console. The third row is expected to be skipped.
Simon Hug
It seems not everyone implemented glDrawTexfOES the same. Intel and Mesa ignore the viewport entirely, whereas the Raspberry Pi implementation offsets the coordinates and does viewport clipping.
The glDrawTexfOES extension text [1] for the function says "Xs and Ys are given directly in window (viewport) coordinates." I guess this wasn't clear enough.
Alex Szpakowski
Honestly I'd probably remove that codepath from SDL_Render entirely. It's an OpenGL ES 1-specific extension that isn't likely to give huge performance gains and adds additional maintenance overhead to SDL_Render while also having bugs in some drivers (as seen here).
SFC30 controller: http://www.8bitdo.com/sfc30/
The SFC30 controller can present itself in a variety of modes and it offers up
different names in each. This patch captures data for three modes (one USB and
two Bluetooth) on three platforms (Mac OS X, Windows, Linux).
However, USB mode on Linux and Windows is missing as the button events did not
make it through to SDL's controllermap tool on Fedora 24/Linux 4.5.5 nor Steam
Big Picture mode on Windows. The two Bluetooth modes were indistinguishable on
Windows. Two modes on OS X were indistinguishable.
There exists a similar controller called the SNES30 (And some others) that are
very likely identical except for the name, but I have not verified this yet so
haven't synthesized lines for those controllers until I can.
Kai Sterker
There are already patches available from mingw64 that fix the issue
https://github.com/Alexpux/MINGW-packages/tree/master/mingw-w64-SDL2
With those applied, I could compile SDL2 without problems. But of course, it would be preferable if SDL built cleanly from source.
Vitaly Novichkov
Line 124
====================================================================
const DWORD flags = thread->stacksize ? STACK_SIZE_PARAM_IS_A_RESERVATION : 0;
====================================================================
Error of compiler:
====================================================================
CC build/SDL_systhread.lo
src/thread/windows/SDL_systhread.c: In function 'SDL_SYS_CreateThread':
src/thread/windows/SDL_systhread.c:124:45: error: 'STACK_SIZE_PARAM_IS_A_RESERVA
TION' undeclared (first use in this function)
const DWORD flags = thread->stacksize ? STACK_SIZE_PARAM_IS_A_RESERVATION :
0;
^
src/thread/windows/SDL_systhread.c:124:45: note: each undeclared identifier is r
eported only once for each function it appears in
make: *** [build/SDL_systhread.lo] Error 1
====================================================================
Fixing when I adding into begin of the file:
====================================================================
#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
#endif
====================================================================
The Apple TV remote is currently exposed as a joystick with its touch surface treated as two axes. Key presses are also generated when its buttons and touch surface are used.
A new hint has been added to help deal with deciding whether to background the app when the remote's menu button is pressed: SDL_HINT_APPLE_TV_CONTROLLER_UI_EVENTS.
Sam Lantinga
Bastien Nocera
Jonathan Dowland
Philipp Wiesemann
Ryan C. Gordon
Alex Szpakowski
Brandon Schaefer
Charlie Birks
Alon Zakai