pandory500/SDL-mirror
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Implemented more flexible blending modes for accelerated renderers

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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);
This commit is contained in:
Sam Lantinga 2017-08-14 05:51:44 -07:00
parent 48945ea079
commit 808e24ac4a
16 changed files with 718 additions and 778 deletions
Download patch file Download diff file Expand all files Collapse all files

10
test/testsprite2.c
View file

@ -99,7 +99,12 @@ LoadSprite(const char *file)
SDL_FreeSurface(temp);
return (-1);
}
SDL_SetTextureBlendMode(sprites[i], blendMode);
if (SDL_SetTextureBlendMode(sprites[i], blendMode) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set blend mode: %s\n", SDL_GetError());
SDL_FreeSurface(temp);
SDL_DestroyTexture(sprites[i]);
return (-1);
}
}
SDL_FreeSurface(temp);
@ -295,6 +300,9 @@ main(int argc, char *argv[])
} else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
blendMode = SDL_BLENDMODE_MOD;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "sub") == 0) {
blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_SUBTRACT, SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_SUBTRACT);
consumed = 2;
}
}
} else if (SDL_strcasecmp(argv[i], "--iterations") == 0) {