From 992516fcf616fe6ceb55f5a6767eb174aff3f830 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 4 Mar 2021 23:30:13 +0200
Subject: [PATCH] Load builtin GLSL declarations from a file

I'm going to add a lot more stuff into it so having it in the C++ source
would be inconvenient.
---
 builtin_data/_builtin.glsl | 18 ++++++++++++++++++
 source/glsl/builtin.cpp    | 28 +++++++---------------------
 2 files changed, 25 insertions(+), 21 deletions(-)
 create mode 100644 builtin_data/_builtin.glsl

diff --git a/builtin_data/_builtin.glsl b/builtin_data/_builtin.glsl
new file mode 100644
index 00000000..f6a3574f
--- /dev/null
+++ b/builtin_data/_builtin.glsl
@@ -0,0 +1,18 @@
+#pragma MSP stage(vertex)
+out gl_PerVertex
+{
+  vec4 gl_Position;
+  float gl_ClipDistance[];
+};
+
+#pragma MSP stage(geometry)
+in gl_PerVertex
+{
+  vec4 gl_Position;
+  float gl_ClipDistance[];
+} gl_in[];
+out gl_PerVertex
+{
+  vec4 gl_Position;
+  float gl_ClipDistance[];
+};
diff --git a/source/glsl/builtin.cpp b/source/glsl/builtin.cpp
index 955266fe..9aa6a6c2 100644
--- a/source/glsl/builtin.cpp
+++ b/source/glsl/builtin.cpp
@@ -1,28 +1,10 @@
+#include <msp/gl/resources.h>
+#include <msp/io/seekable.h>
 #include "builtin.h"
 #include "parser.h"
 
 using namespace std;
 
-namespace {
-
-const char builtins_src[] =
-	"#pragma MSP stage(vertex)\n"
-	"out gl_PerVertex {\n"
-	"  vec4 gl_Position;\n"
-	"  float gl_ClipDistance[];\n"
-	"};\n"
-	"#pragma MSP stage(geometry)\n"
-	"in gl_PerVertex {\n"
-	"  vec4 gl_Position;\n"
-	"  float gl_ClipDistance[];\n"
-	"} gl_in[];\n"
-	"out gl_PerVertex {\n"
-	"  vec4 gl_Position;\n"
-	"  float gl_ClipDistance[];\n"
-	"};\n";
-
-}
-
 namespace Msp {
 namespace GL {
 namespace SL {
@@ -35,8 +17,12 @@ Module *get_builtins_module()
 	{
 		initialized = true;
 
+		RefPtr<IO::Seekable> io = Resources::get_builtins().open("_builtin.glsl");
+		if(!io)
+			return 0;
+
 		Parser parser;
-		Module *module = new Module(parser.parse(builtins_src, "<builtin>", BUILTIN_SOURCE));
+		Module *module = new Module(parser.parse(*io, "<builtin>", BUILTIN_SOURCE));
 
 		builtins_module = module;
 	}
-- 
2.43.0