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Fixed bug 4903 - Lack of color multiply with alpha (SDL_BLENDMODE_MOD + SDL_BLENDMODE_BLEND) blending mode for all renderers

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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.
This commit is contained in:
Sam Lantinga
2020-01-16 08:52:59 -08:00
parent 669729a8a0
commit 981e0d367c
19 changed files with 819 additions and 159 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
src/render/software/SDL_blendpoint.c
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@@ -42,6 +42,9 @@ SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode,
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB555(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY_MUL_RGB555(x, y);
break;
default:
DRAW_SETPIXELXY_RGB555(x, y);
break;
@@ -65,6 +68,9 @@ SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode,
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB565(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY_MUL_RGB565(x, y);
break;
default:
DRAW_SETPIXELXY_RGB565(x, y);
break;
@@ -88,6 +94,9 @@ SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode,
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB888(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY_MUL_RGB888(x, y);
break;
default:
DRAW_SETPIXELXY_RGB888(x, y);
break;
@@ -111,6 +120,9 @@ SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY_MUL_ARGB8888(x, y);
break;
default:
DRAW_SETPIXELXY_ARGB8888(x, y);
break;
@@ -137,6 +149,9 @@ SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uin
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY2_MOD_RGB(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY2_MUL_RGB(x, y);
break;
default:
DRAW_SETPIXELXY2_RGB(x, y);
break;
@@ -153,6 +168,9 @@ SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uin
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY4_MOD_RGB(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY4_MUL_RGB(x, y);
break;
default:
DRAW_SETPIXELXY4_RGB(x, y);
break;
@@ -182,6 +200,9 @@ SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Ui
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY4_MOD_RGBA(x, y);
break;
case SDL_BLENDMODE_MUL:
DRAW_SETPIXELXY4_MUL_RGBA(x, y);
break;
default:
DRAW_SETPIXELXY4_RGBA(x, y);
break;