Add the SDL_BlendFactor enum

Author: suve

sdlblendmode.inc

@@ -24,3 +24,20 @@ const
   SDL_BLENDOPERATION_REV_SUBTRACT     = $3;  {**< src - dst : supported by D3D9, D3D11, OpenGL, OpenGLES}
   SDL_BLENDOPERATION_MINIMUM          = $4;  {**< min(dst, src) : supported by D3D11 *}
   SDL_BLENDOPERATION_MAXIMUM          = $5;  {**< max(dst, src) : supported by D3D11 *}
+
+type
+  PSDL_BlendFactor = ^TSDL_BlendFactor;
+  TSDL_BlendFactor = DWord;
+
+const
+  SDL_BLENDFACTOR_ZERO                = $1;  {**< 0, 0, 0, 0 *}
+  SDL_BLENDFACTOR_ONE                 = $2;  {**< 1, 1, 1, 1 *}
+  SDL_BLENDFACTOR_SRC_COLOR           = $3;  {**< srcR, srcG, srcB, srcA *}
+  SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR = $4;  {**< 1-srcR, 1-srcG, 1-srcB, 1-srcA *}
+  SDL_BLENDFACTOR_SRC_ALPHA           = $5;  {**< srcA, srcA, srcA, srcA *}
+  SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA = $6;  {**< 1-srcA, 1-srcA, 1-srcA, 1-srcA *}
+  SDL_BLENDFACTOR_DST_COLOR           = $7;  {**< dstR, dstG, dstB, dstA *}
+  SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR = $8;  {**< 1-dstR, 1-dstG, 1-dstB, 1-dstA *}
+  SDL_BLENDFACTOR_DST_ALPHA           = $9;  {**< dstA, dstA, dstA, dstA *}
+  SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA = $A;  {**< 1-dstA, 1-dstA, 1-dstA, 1-dstA *}
+