Implement .gsh directive

Changelog.md

@@ -4,7 +4,7 @@
 
 - (**Breaking change**) Command line format changed.
 - Added support for assembling multiple shaders (DVLEs) into a single SHBIN.
-- Added new directives: `.entry`, `.nodvle`, `.setf`, `.seti`, `.setb`.
+- Added new directives: `.entry`, `.nodvle`, `.gsh`, `.setf`, `.seti`, `.setb`.
 - Added auto-detection of inverted forms of opcodes. (Explicitly using `dphi`, `sgei`, `slti` and `madi` is now deprecated)
 - Several miscellaneous bug fixes.
 

Manual.md

@@ -72,7 +72,7 @@ DVLEs are generated in the same order as the files in the command line.
 
 The entry point of a DVLE may be set with the `.entry` directive. If this directive is not used, `main` is assumed as the entrypoint.
 
-A DVLE is marked by default as a vertex shader, unless `setemit` is used (in the case of which a geometry shader is assumed).
+A DVLE is marked by default as a vertex shader, unless `setemit` or `.gsh` are used (in the case of which a geometry shader is assumed).
 
 Uniforms that start with the underscore (`_`) character are not exposed in the DVLE table of uniforms. This allows for creating private uniforms that can be internally used to configure the behaviour of shared procedures.
 
@@ -188,6 +188,12 @@ Specifies the name of the procedure to use as the entrypoint of the current DVLE
 ```
 This directive tells `picasso` not to generate a DVLE for the source code file that is being processed. This allows for writing files that contain shared procedures to be used by other files.
 
+### .gsh
+```
+.gsh
+```
+This directive explicitly flags the current DVLE as a geometry shader.
+
 ### .setf
 ```
 .setf register(x, y, z, w)

source/picasso_assembler.cpp

@@ -1557,6 +1557,19 @@ DEF_DIRECTIVE(nodvle)
 	}
 }
 
+DEF_DIRECTIVE(gsh)
+{
+	DVLEData* dvle = GetDvleData();
+	ENSURE_NO_MORE_ARGS();
+
+	if (dvle->nodvle)
+		return throwError(".gsh has no effect if .nodvle is used\n");
+
+	dvle->isGeoShader = true;
+	return 0;
+}
+
+
 static const cmdTableType dirTable[] =
 {
 	DEC_DIRECTIVE(proc),
@@ -1571,6 +1584,7 @@ static const cmdTableType dirTable[] =
 	DEC_DIRECTIVE(out),
 	DEC_DIRECTIVE(entry),
 	DEC_DIRECTIVE(nodvle),
+	DEC_DIRECTIVE(gsh),
 	DEC_DIRECTIVE2(setf, setfi, UTYPE_FVEC),
 	DEC_DIRECTIVE2(seti, setfi, UTYPE_IVEC),
 	DEC_DIRECTIVE(setb),