Andreas M?ller 87bc1fb552 GLES2: Get sin/cos out of vertex shader ... The only place angle is activated and causes effect is RenderCopyEx. All other methods which use vertex shader, leave angle disabled and cause useless sin/cos calculation in shader. To get around shader's interface is changed to a vector that contains results of sin and cos. To behave properly when disabled, cos value is set with offset -1.0 making 0.0 default when deactivated. As nice side effect it simplifies GLES2_UpdateVertexBuffer: All attributes are vectors now. Additional background: * On RaspberryPi it gives a performace win for operations. Tested with [1] numbers go down for 5-10% (not easy to estimate due to huge variation). * SDL_RenderCopyEx was tested with [2] * It works around left rotated display caused by low accuracy sin implemetation in RaspberryPi/VC4 [3] [1] https://github.com/schnitzeltony/sdl2box [2] https://github.com/schnitzeltony/sdl2rendercopyex [3] https://github.com/anholt/mesa/issues/110 Signed-off-by: Andreas M?ller <schnitzeltony@gmail.com>		2018-08-28 12:57:51 -07:00
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SDL_gles2funcs.h	Backed out changeset 6c8521d53507	2018-02-21 22:53:52 -05:00
SDL_render_gles2.c	GLES2: Get sin/cos out of vertex shader	2018-08-28 12:57:51 -07:00
SDL_shaders_gles2.c	GLES2: Get sin/cos out of vertex shader	2018-08-28 12:57:51 -07:00
SDL_shaders_gles2.h	Updated copyright for 2018	2018-01-03 10:03:25 -08:00