diff --git a/libs/vkd3d-shader/glsl.c b/libs/vkd3d-shader/glsl.c
index ddab6b3a..e88c0c42 100644
--- a/libs/vkd3d-shader/glsl.c
+++ b/libs/vkd3d-shader/glsl.c
@@ -602,6 +602,15 @@ static void shader_glsl_print_sysval_name(struct vkd3d_string_buffer *buffer, st
             }
             break;
 
+        case VKD3D_SHADER_SV_IS_FRONT_FACE:
+            if (version->type != VKD3D_SHADER_TYPE_PIXEL)
+                vkd3d_glsl_compiler_error(gen, VKD3D_SHADER_ERROR_GLSL_INTERNAL,
+                        "Internal compiler error: Unhandled SV_IS_FRONT_FACE in shader type #%x.", version->type);
+            vkd3d_string_buffer_printf(buffer,
+                    "uintBitsToFloat(uvec4(gl_FrontFacing ? 0xffffffffu : 0u, 0u, 0u, 0u))");
+
+            break;
+
         case VKD3D_SHADER_SV_TARGET:
             if (version->type != VKD3D_SHADER_TYPE_PIXEL)
                 vkd3d_glsl_compiler_error(gen, VKD3D_SHADER_ERROR_GLSL_INTERNAL,
@@ -731,6 +740,7 @@ static void vkd3d_glsl_handle_instruction(struct vkd3d_glsl_generator *gen,
             break;
         case VKD3DSIH_DCL_INPUT:
         case VKD3DSIH_DCL_INPUT_PS:
+        case VKD3DSIH_DCL_INPUT_PS_SIV:
         case VKD3DSIH_DCL_OUTPUT:
         case VKD3DSIH_DCL_OUTPUT_SIV:
         case VKD3DSIH_NOP:
diff --git a/tests/hlsl/is-front-face.shader_test b/tests/hlsl/is-front-face.shader_test
index f52b456e..06be3fb9 100644
--- a/tests/hlsl/is-front-face.shader_test
+++ b/tests/hlsl/is-front-face.shader_test
@@ -22,7 +22,7 @@ float4 main(bool face : sv_isfrontface) : sv_target
 }
 
 [test]
-todo(glsl) draw triangle strip 4
+draw triangle strip 4
 probe (0, 0, 640, 480) rgba (0.0, 1.0, 0.0, 1.0)
 
 [vb 0]
@@ -32,5 +32,5 @@ probe (0, 0, 640, 480) rgba (0.0, 1.0, 0.0, 1.0)
  2.0  2.0
 
 [test]
-todo(glsl) draw triangle strip 4
+draw triangle strip 4
 probe (0, 0, 640, 480) rgba (1.0, 2.0, 1.0, 2.0)