opengl: add shader build infrastructure

perl script to transform shader programs into c include files with
static string constands containing the shader programs, so we can
easily embed them into qemu.  Also some Makefile logic for them.

Signed-off-by: Gerd Hoffmann <[email protected]>
Reviewed-by: Max Reitz <[email protected]>

Makefile

@@ -296,6 +296,7 @@ clean:
 	rm -f fsdev/*.pod
 	rm -rf .libs */.libs
 	rm -f qemu-img-cmds.h
+	rm -f ui/shader/*-vert.h ui/shader/*-frag.h
 	@# May not be present in GENERATED_HEADERS
 	rm -f trace/generated-tracers-dtrace.dtrace*
 	rm -f trace/generated-tracers-dtrace.h*
@@ -441,6 +442,19 @@ cscope:
 	find "$(SRC_PATH)" -name "*.[chsS]" -print | sed 's,^\./,,' > ./cscope.files
 	cscope -b
 
+# opengl shader programs
+ui/shader/%-vert.h: $(SRC_PATH)/ui/shader/%.vert $(SRC_PATH)/scripts/shaderinclude.pl
+	@mkdir -p $(dir $@)
+	$(call quiet-command,\
+		perl $(SRC_PATH)/scripts/shaderinclude.pl $< > $@,\
+		"  VERT  $@")
+
+ui/shader/%-frag.h: $(SRC_PATH)/ui/shader/%.frag $(SRC_PATH)/scripts/shaderinclude.pl
+	@mkdir -p $(dir $@)
+	$(call quiet-command,\
+		perl $(SRC_PATH)/scripts/shaderinclude.pl $< > $@,\
+		"  FRAG  $@")
+
 # documentation
 MAKEINFO=makeinfo
 MAKEINFOFLAGS=--no-headers --no-split --number-sections

scripts/shaderinclude.pl

@@ -0,0 +1,16 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+my $file = shift;
+open FILE, "<", $file or die "open $file: $!";
+my $name = $file;
+$name =~ s|.*/||;
+$name =~ s/[-.]/_/g;
+print "static GLchar ${name}_src[] =\n";
+while (<FILE>) {
+    chomp;
+    printf "    \"%s\\n\"\n", $_;
+}
+print "    \"\\n\";\n";
+close FILE;