X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fglsl%2Fpreprocessor.cpp;fp=source%2Fglsl%2Fpreprocessor.cpp;h=3c190221952ab7758fdbbc984c071abb41d39c8f;hb=d3ceb2186dc79130508093b3d0c944771a53534f;hp=0000000000000000000000000000000000000000;hpb=47286086863b6009192ffdb3d3471c83211ee943;p=libs%2Fgl.git

diff --git a/source/glsl/preprocessor.cpp b/source/glsl/preprocessor.cpp
new file mode 100644
index 00000000..3c190221
--- /dev/null
+++ b/source/glsl/preprocessor.cpp
@@ -0,0 +1,85 @@
+#include "glsl_error.h"
+#include "preprocessor.h"
+#include "tokenizer.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+namespace SL {
+
+Preprocessor::Preprocessor(Tokenizer &t):
+	tokenizer(t)
+{ }
+
+void Preprocessor::preprocess()
+{
+	tokenizer.expect("#");
+
+	string token = tokenizer.peek_token();
+	if(token=="pragma")
+		preprocess_pragma();
+	else if(token=="version")
+		preprocess_version();
+	else if(token=="define" || token=="undef" || token=="if" || token=="ifdef" || token=="ifndef" || token=="else" ||
+		token=="elif" || token=="endif" || token=="error" || token=="extension" || token=="line")
+		throw invalid_shader_source(tokenizer.get_location(), "Unsupported preprocessor directive '%s'", token);
+	else if(!token.empty())
+		throw parse_error(tokenizer.get_location(), token, "a preprocessor directive");
+}
+
+void Preprocessor::preprocess_version()
+{
+	tokenizer.expect("version");
+	string token = tokenizer.parse_token();
+	unsigned version = lexical_cast<unsigned>(token);
+	signal_version.emit(Version(version/100, version%100));
+
+	token = tokenizer.parse_token();
+	if(!token.empty())
+		throw parse_error(tokenizer.get_location(), token, "end of line");
+}
+
+void Preprocessor::preprocess_pragma()
+{
+	tokenizer.expect("pragma");
+	string token = tokenizer.parse_token();
+	if(token=="MSP")
+		preprocess_pragma_msp();
+}
+
+void Preprocessor::preprocess_pragma_msp()
+{
+	string token = tokenizer.peek_token();
+	if(token=="stage")
+		preprocess_stage();
+	else
+		throw invalid_shader_source(tokenizer.get_location(), "Unrecognized MSP pragma '%s'", token);
+
+	token = tokenizer.parse_token();
+	if(!token.empty())
+		throw parse_error(tokenizer.get_location(), token, "end of line");
+}
+
+void Preprocessor::preprocess_stage()
+{
+	tokenizer.expect("stage");
+	tokenizer.expect("(");
+	string token = tokenizer.parse_token();
+	StageType stage = SHARED;
+	if(token=="vertex")
+		stage = VERTEX;
+	else if(token=="geometry")
+		stage = GEOMETRY;
+	else if(token=="fragment")
+		stage = FRAGMENT;
+	else
+		throw parse_error(tokenizer.get_location(), token, "stage identifier");
+	tokenizer.expect(")");
+
+	signal_stage_change.emit(stage);
+}
+
+} // namespace SL
+} // namespace GL
+} // namespace Msp