softgpu: Fix pixel ID for invalid blend factors.

They should still be treated as FIX, we were accidentally using our
special values.

GPU/Software/FuncId.cpp

@@ -155,9 +155,9 @@ void ComputePixelFuncID(PixelFuncID *id) {
 			id->alphaBlendSrc = gstate.getBlendFuncA();
 			id->alphaBlendDst = gstate.getBlendFuncB();
 			// Special values.
-			if (id->alphaBlendSrc == GE_SRCBLEND_FIXA)
+			if (id->alphaBlendSrc >= GE_SRCBLEND_FIXA)
 				id->alphaBlendSrc = (uint8_t)OptimizeAlphaFactor(gstate.getFixA());
-			if (id->alphaBlendDst == GE_DSTBLEND_FIXB)
+			if (id->alphaBlendDst >= GE_DSTBLEND_FIXB)
 				id->alphaBlendDst = (uint8_t)OptimizeAlphaFactor(gstate.getFixB());
 		}
 

test.py

@@ -135,6 +135,7 @@ tests_good = [
   "gpu/clut/shifts",
   "gpu/commands/basic",
   "gpu/commands/blend",
+  "gpu/commands/blend565",
   "gpu/commands/blocktransfer",
   "gpu/commands/material",
   "gpu/dither/dither",
@@ -375,7 +376,6 @@ tests_next = [
   "font/shadowglyphimageclip",
   "font/shadowinfo",
   "gpu/clipping/guardband",
-  "gpu/commands/blend565",
   "gpu/commands/cull",
   "gpu/commands/light",
   "gpu/complex/complex",