From 2234f91c38476f90a632ec8158501b6044706799 Mon Sep 17 00:00:00 2001
From: yohimik <yohimik@gmail.com>
Date: Tue, 3 Jun 2025 20:10:33 +0400
Subject: [PATCH] ref: gl: add stubs for WebGL

---
 ref/gl/gl2_shim/gl2_shim.c | 64 ++++++++++++++++++++++++++++++++++++++
 wscript                    |  9 +++++-
 2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/ref/gl/gl2_shim/gl2_shim.c b/ref/gl/gl2_shim/gl2_shim.c
index b2ab0e9d..34269812 100644
--- a/ref/gl/gl2_shim/gl2_shim.c
+++ b/ref/gl/gl2_shim/gl2_shim.c
@@ -1714,6 +1714,56 @@ static void APIENTRY stub( void )
 	*((void **)&pgl ## name) = (void *)stub; \
 }
 
+#if XASH_EMSCRIPTEN
+static void GL2_PolygonMode( GLenum face, GLenum mode )
+{
+}
+
+static void GL2_PolygonOffset( GLfloat factor, GLfloat units )
+{
+}
+
+static void GL2_ShadeModel( GLenum mode )
+{
+}
+
+static void GL2_PointSize( GLfloat size )
+{
+}
+
+static void GL2_Normal3fv( const GLfloat *v )
+{
+}
+
+static void GL2_Hint( GLenum target, GLenum mode )
+{
+}
+
+static void GL2_Scalef( GLfloat x, GLfloat y, GLfloat z )
+{
+}
+
+static void GL2_Translatef( GLfloat x, GLfloat y, GLfloat z )
+{
+}
+
+static void GL2_TexEnvi( GLenum target, GLenum pname, GLint param )
+{
+}
+
+static void GL2_TexEnvf( GLenum target, GLenum pname, GLfloat param )
+{
+}
+
+static void GL2_Fogi( GLenum pname, GLint param )
+{
+}
+
+static void GL2_DrawBuffer( GLenum mode )
+{
+}
+#endif // XASH_EMSCRIPTEN
+
 void GL2_ShimInstall( void )
 {
 	GL2_OVERRIDE_PTR( Vertex2f )
@@ -1758,6 +1808,20 @@ void GL2_ShimInstall( void )
 		GL2_OVERRIDE_PTR_B( TexImage2D )
 		GL2_OVERRIDE_PTR_B( TexParameteri )
 	}
+#if XASH_EMSCRIPTEN
+	GL2_OVERRIDE_PTR( Normal3fv )
+	GL2_OVERRIDE_PTR( Hint )
+	GL2_OVERRIDE_PTR( Scalef )
+	GL2_OVERRIDE_PTR( Translatef )
+	GL2_OVERRIDE_PTR( TexEnvi )
+	GL2_OVERRIDE_PTR( TexEnvf )
+	GL2_OVERRIDE_PTR( Fogi )
+	GL2_OVERRIDE_PTR( ShadeModel )
+	GL2_OVERRIDE_PTR( PolygonMode )
+	GL2_OVERRIDE_PTR( PointSize )
+	GL2_OVERRIDE_PTR( PolygonOffset )
+	GL2_OVERRIDE_PTR( DrawBuffer )
+#endif // XASH_EMSCRIPTEN
 	GL2_OVERRIDE_PTR_B( IsEnabled )
 	GL2_OVERRIDE_PTR_B( DrawRangeElements )
 	GL2_OVERRIDE_PTR_B( DrawElements )
diff --git a/wscript b/wscript
index 4b84bd6e..52226427 100644
--- a/wscript
+++ b/wscript
@@ -123,7 +123,7 @@ REFDLLS = [
 	RefDll('gles1', False, 'NANOGL'),
 	RefDll('gles2', False, 'GLWES'),
 	RefDll('gl4es', False),
-	RefDll('gles3compat', False),
+	RefDll('gles3compat', False, 'GLES3COMPAT'),
 	RefDll('null', False),
 ]
 
@@ -191,6 +191,9 @@ def options(opt):
 	grp.add_option('--enable-fuzzer', action = 'store_true', dest = 'ENABLE_FUZZER', default = False,
 		help = 'enable building libFuzzer runner [default: %(default)s]' )
 
+	grp.add_option('--enable-emscripten', action = 'store_true', dest = 'ENABLE_EMSCRIPTEN', default = False,
+		help = 'enable emscripten support [default: %(default)s]' )
+
 	for i in SUBDIRS:
 		if not i.is_exists(opt):
 			continue
@@ -252,6 +255,10 @@ def configure(conf):
 		conf.options.GLES3COMPAT      = True
 		conf.options.GL               = False
 
+	if conf.options.ENABLE_EMSCRIPTEN:
+		conf.options.GLES3COMPAT	      = True
+		conf.options.GL                   = False
+
 	# psvita needs -fPIC set manually and static builds are incompatible with -fPIC
 	enforce_pic = conf.env.DEST_OS != 'psvita' and not conf.env.STATIC_LINKING
 	conf.check_pic(enforce_pic)