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22 Commits

Author SHA1 Message Date
Sam Lantinga
89be0e49c6 Updated copyright date for 2020 2020-01-16 20:49:25 -08:00
Sam Lantinga
42d4027b9b Fixed bug 4903 - Lack of color multiply with alpha (SDL_BLENDMODE_MOD + SDL_BLENDMODE_BLEND) blending mode for all renderers 
Konrad

This kind of blending is rather quite useful and in my opinion should be available for all renderers. I do need it myself, but since I didn't want to use a custom blending mode which is supported only by certain renderers (e.g. not in software which is quite important for me) I did write implementation of SDL_BLENDMODE_MUL for all renderers altogether.

SDL_BLENDMODE_MUL implements following equation:

dstRGB = (srcRGB * dstRGB) + (dstRGB * (1-srcA))
dstA = (srcA * dstA) + (dstA * (1-srcA))

Background:

https://i.imgur.com/UsYhydP.png

Blended texture:

https://i.imgur.com/0juXQcV.png

Result for SDL_BLENDMODE_MOD:

https://i.imgur.com/wgNSgUl.png

Result for SDL_BLENDMODE_MUL:

https://i.imgur.com/Veokzim.png

I think I did cover all possibilities within included patch, but I didn't write any tests for SDL_BLENDMODE_MUL, so it would be lovely if someone could do it.
 2020-01-16 08:52:59 -08:00
Sam Lantinga
a7609d9e2a Updated copyright for 2019 2019-01-04 22:01:14 -08:00
Ryan C. Gordon
8e4e731587 Added some detail to a Doxygen comment (thanks, Sylvain!). 2018-12-01 12:17:34 -05:00
Sam Lantinga
a9072159b2 Updated copyright for 2018 2018-01-03 10:03:25 -08:00
Sam Lantinga
b4534658a9 Fixed compiler warning with enum 2017-08-14 10:14:07 -07:00
Sam Lantinga
df0ee407ab Implemented more flexible blending modes for accelerated renderers 
This fixes bug 2594 - Propose new blend mode, SDL_BLENDMODE_BLEND_DSTA

	blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA,
	                                       SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
	                                       SDL_BLENDOPERATION_ADD,
	                                       SDL_BLENDFACTOR_ZERO,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDOPERATION_ADD);

This fixes bug 2828 - Subtractive Blending

	blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDOPERATION_SUBTRACT,
	                                       SDL_BLENDFACTOR_ZERO,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDOPERATION_SUBTRACT);


This goes partway to fixing bug 3684 - Add support for a pre-multiplied alpha blending mode

	blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
	                                       SDL_BLENDOPERATION_ADD,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
	                                       SDL_BLENDOPERATION_ADD);
 2017-08-14 05:51:44 -07:00
Sam Lantinga
d77ab77a7a Updated copyright for 2017 2017-01-01 18:33:28 -08:00
Sam Lantinga
9cc7ce9008 Renaming of guard header names to quiet -Wreserved-id-macro 
Patch contributed by Sylvain
 2016-11-20 21:34:54 -08:00
Sam Lantinga
255c182471 Updated copyright to 2016 2016-01-02 10:10:34 -08:00
Sam Lantinga
78f2198e6c Updated the copyright year to 2015 2015-05-26 06:27:46 -07:00
Philipp Wiesemann
9d0b33d854 Corrected header file guard comments. 2014-11-25 22:37:12 +01:00
Sam Lantinga
dba255c1e5 Fixed bug 2374 - Update copyright for 2014... 
Is it that time already??
 2014-02-02 00:53:27 -08:00
Sam Lantinga
4862c1fc30 Updated blend semantics so blending uses the following formula: 
dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
    dstA = srcA + (dstA * (1-srcA))
This allows proper compositing semantics without requiring premultiplied alpha.

Needs full unit test coverage and bug fixes!
 2013-07-23 08:06:49 -07:00
Sam Lantinga
0d9b661db8 File style cleanup for the SDL 2.0 release 2013-05-18 14:17:52 -07:00
Sam Lantinga
019c60c1e8 Happy New Year! 2013-02-15 08:47:44 -08:00
Sam Lantinga
e256711bb9 Happy New Year! 2011-12-31 09:28:07 -05:00
Sam Lantinga
6196aa221e SDL 1.3 is now under the zlib license. 2011-04-08 13:03:26 -07:00
Sam Lantinga
a2cdcf5486 Happy 2011! :) 2011-02-11 22:37:15 -08:00
Sam Lantinga
4f6e1878af Restored SDL_BLENDMODE_MOD for MAME 2011-02-04 19:50:56 -08:00
Sam Lantinga
0efb1ea0b2 Making the API simpler, the blend modes are "none, blend, add" and are supported by all renderers. 2011-01-31 23:23:57 -08:00
Sam Lantinga
d6eac2c481 Use the enumerated type for blend and scale mode instead of int 
Renamed SDL_TextureScaleMode to SDL_ScaleMode
 2010-12-12 15:19:05 -08:00