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default descpool for shaders -1, basic compile checks

--- a/vm.c

+++ b/vm.c

@@ -147,6 +147,7 @@

 	objects[id].type = SHADER;

 	objects[id].s.buffer = nil;

 	objects[id].s.len = -1;

+	objects[id].s.descpool = -1;

 	updateinfostring(id);

 	return id;

 }

@@ -272,6 +273,22 @@

 int

 compileshader(vlong id)

 {

+	Shader *sh;

+	if (!validate(id, SHADER)) {

+		return 0;

+	}

+	

+	sh = &objects[id].s;

+	if (!sh->buffer || sh->len <= 0) {

+		werrstr("shader is empty");

+		return 0;

+	}

+	

+	if (sh->descpool < 0) {

+		werrstr("shader is not bound to a descriptor pool");

+		return 0;

+	}

+	

 	werrstr("not implemented!");

 	return 0;

 }