From f51eae2c41aeac49e82ce233d5c3a16482926700 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 12 Nov 2014 02:01:05 +0200
Subject: [PATCH] Improve legacy mode logic in ProgramBuilder

---
 source/programbuilder.cpp | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/source/programbuilder.cpp b/source/programbuilder.cpp
index a2d49ac8..dc4bd19c 100644
--- a/source/programbuilder.cpp
+++ b/source/programbuilder.cpp
@@ -44,7 +44,7 @@ Naming conventions:
 anything that might need them. */
 const ProgramBuilder::VariableDefinition ProgramBuilder::standard_variables[] =
 {
-	{ FRAGMENT, "gl_FragColor", "vec4", "frag_color", "g" },
+	{ FRAGMENT, "gl_FragColor", "vec4", "frag_color", 0 },
 	{ FRAGMENT, "frag_color", "vec4", "basic_color", "!e!l" },
 	{ FRAGMENT, "frag_color", "vec4", "vec4(rgb_surface, surface_alpha)", "!el" },
 	{ FRAGMENT, "frag_color", "vec4", "vec4(rgb_surface+rgb_reflection, surface_alpha)", "e" },
@@ -236,7 +236,7 @@ ProgramBuilder::ProgramBuilder(const StandardFeatures &f):
 		}
 	}
 
-	if((get_gl_api()==OPENGL && !features.legacy) || (get_gl_api()==OPENGL_ES2 && get_glsl_version()>=Version(3, 0)))
+	if(!features.legacy)
 	{
 		aliases["texture2D"] = "texture";
 		aliases["shadow2D"] = "texture";
@@ -345,8 +345,9 @@ void ProgramBuilder::add_shaders(Program &prog) const
 	for(list<ShaderVariable>::iterator i=variables.end(); i!=variables.begin(); )
 		(--i)->resolve_array(features);
 
+	bool legacy_variables = evaluate_flags("g");
 	for(list<ShaderVariable *>::const_iterator i=resolved_vars.begin(); i!=resolved_vars.end(); ++i)
-		(*i)->check_inline(features.legacy, !optimize);
+		(*i)->check_inline(legacy_variables, !optimize);
 
 	prog.attach_shader_owned(new VertexShader(create_source(resolved_vars, VERTEX)));
 	prog.attach_shader_owned(new FragmentShader(create_source(resolved_vars, FRAGMENT)));
@@ -376,7 +377,6 @@ string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, Va
 {
 	string source;
 
-	bool legacy_qualifiers = features.legacy || (get_gl_api()==OPENGL_ES2 && !(get_glsl_version()>=Version(3, 0)));
 	bool use_blocks = !features.legacy && ARB_uniform_buffer_object;
 
 	if(!features.legacy)
@@ -431,13 +431,13 @@ string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, Va
 
 		if(iface&INPUT)
 		{
-			const char *qualifier = (legacy_qualifiers ? scope==VERTEX ? "attribute" : "varying" : "in");
+			const char *qualifier = (features.legacy ? scope==VERTEX ? "attribute" : "varying" : "in");
 			source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope-1]));
 		}
 
 		if(iface&OUTPUT)
 		{
-			const char *qualifier = (legacy_qualifiers ? "varying" : "out");
+			const char *qualifier = (features.legacy ? "varying" : "out");
 			source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope]));
 		}
 	}
@@ -718,9 +718,13 @@ ProgramBuilder::StandardFeatures::StandardFeatures():
 	specular(false),
 	normalmap(false),
 	shadow(false),
-	reflection(false),
-	legacy(get_gl_api()==OPENGL && !(get_glsl_version()>=Version(1, 30)))
-{ }
+	reflection(false)
+{
+	if(get_gl_api()==OPENGL_ES2)
+		legacy = !(get_glsl_version()>=Version(3, 0));
+	else
+		legacy = !(get_glsl_version()>=Version(1, 30));
+}
 
 string ProgramBuilder::StandardFeatures::create_flags() const
 {
@@ -743,7 +747,7 @@ string ProgramBuilder::StandardFeatures::create_flags() const
 		flags += 's';
 	if(reflection)
 		flags += 'e';
-	if(legacy)
+	if(legacy && get_gl_api()==OPENGL)
 		flags += 'g';
 
 	return flags;
-- 
2.45.2