Use pattern rules in Makefile.am; stage encoded in file extension

Replace 20 explicit per-shader rules with 6 pattern rules keyed on
.vert/.frag/.comp extension. Also use $(addprefix) on the shadercross
phony target so it resolves correctly in out-of-tree builds.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jdolan

Examples/Shaders/Makefile.am

@@ -27,59 +27,40 @@ SPIRV_BLOBS = \
     HelloCompute.vert.spv \
     HelloCompute.frag.spv
 
-DXIL_BLOBS =
-
-EXTRA_DIST = $(HLSL_SOURCES) $(MSL_BLOBS) $(SPIRV_BLOBS) $(DXIL_BLOBS)
+EXTRA_DIST = $(HLSL_SOURCES) $(MSL_BLOBS) $(SPIRV_BLOBS)
 
 # For out-of-tree builds, symlink the pre-built blobs into the build directory
 # so SDL Resource resolution (SDL_GetBasePath() + "Shaders") finds them.
 all-local:
 	@if [ "x$(srcdir)" != "x$(builddir)" ]; then \
-	    for f in $(MSL_BLOBS) $(SPIRV_BLOBS) $(DXIL_BLOBS); do \
+	    for f in $(MSL_BLOBS) $(SPIRV_BLOBS); do \
 	        test -e "$(builddir)/$$f" || \
 	            $(LN_S) "$(abs_srcdir)/$$f" "$(builddir)/$$f"; \
 	    done; \
 	fi
 
 # -------------------------------------------------------------------------
 # shadercross — regenerate all blobs from HLSL source.
-# Requires shadercross (from SDL_shadercross) for HLSL→SPIR-V and HLSL→MSL.
+# Requires shadercross (from SDL_shadercross).
 # -------------------------------------------------------------------------
 
 .PHONY: shadercross
-shadercross: $(MSL_BLOBS) $(SPIRV_BLOBS)
+shadercross: $(addprefix $(srcdir)/,$(MSL_BLOBS) $(SPIRV_BLOBS))
 
-# Hello — vertex
-$(srcdir)/Hello.vert.spv: $(srcdir)/Hello.vert.hlsl
+$(srcdir)/%.vert.spv: $(srcdir)/%.vert.hlsl
 	$(SHADERCROSS) $< -s HLSL -d SPIRV -t vertex -e vs_main -o $@
 
-$(srcdir)/Hello.vert.msl: $(srcdir)/Hello.vert.hlsl
+$(srcdir)/%.vert.msl: $(srcdir)/%.vert.hlsl
 	$(SHADERCROSS) $< -s HLSL -d MSL -t vertex -e vs_main -o $@
 
-# Hello — fragment
-$(srcdir)/Hello.frag.spv: $(srcdir)/Hello.frag.hlsl
+$(srcdir)/%.frag.spv: $(srcdir)/%.frag.hlsl
 	$(SHADERCROSS) $< -s HLSL -d SPIRV -t fragment -e fs_main -o $@
 
-$(srcdir)/Hello.frag.msl: $(srcdir)/Hello.frag.hlsl
+$(srcdir)/%.frag.msl: $(srcdir)/%.frag.hlsl
 	$(SHADERCROSS) $< -s HLSL -d MSL -t fragment -e fs_main -o $@
 
-# HelloCompute — compute
-$(srcdir)/HelloCompute.comp.spv: $(srcdir)/HelloCompute.comp.hlsl
+$(srcdir)/%.comp.spv: $(srcdir)/%.comp.hlsl
 	$(SHADERCROSS) $< -s HLSL -d SPIRV -t compute -e cs_main -o $@
 
-$(srcdir)/HelloCompute.comp.msl: $(srcdir)/HelloCompute.comp.hlsl
+$(srcdir)/%.comp.msl: $(srcdir)/%.comp.hlsl
 	$(SHADERCROSS) $< -s HLSL -d MSL -t compute -e cs_main -o $@
-
-# HelloCompute — vertex
-$(srcdir)/HelloCompute.vert.spv: $(srcdir)/HelloCompute.vert.hlsl
-	$(SHADERCROSS) $< -s HLSL -d SPIRV -t vertex -e vs_main -o $@
-
-$(srcdir)/HelloCompute.vert.msl: $(srcdir)/HelloCompute.vert.hlsl
-	$(SHADERCROSS) $< -s HLSL -d MSL -t vertex -e vs_main -o $@
-
-# HelloCompute — fragment
-$(srcdir)/HelloCompute.frag.spv: $(srcdir)/HelloCompute.frag.hlsl
-	$(SHADERCROSS) $< -s HLSL -d SPIRV -t fragment -e fs_main -o $@
-
-$(srcdir)/HelloCompute.frag.msl: $(srcdir)/HelloCompute.frag.hlsl
-	$(SHADERCROSS) $< -s HLSL -d MSL -t fragment -e fs_main -o $@