diff --git a/rpcs3/Emu/RSX/Program/GLSLCommon.cpp b/rpcs3/Emu/RSX/Program/GLSLCommon.cpp
index 25a89883d8..a378349a50 100644
--- a/rpcs3/Emu/RSX/Program/GLSLCommon.cpp
+++ b/rpcs3/Emu/RSX/Program/GLSLCommon.cpp
@@ -1246,30 +1246,14 @@ namespace glsl
 
 		// Interpolate the input attributes manually.
 		// Matches AMD behavior where gl_BaryCoordSmoothAMD only provides x and y with z being autogenerated.
-		std::string interpolate_function_block;
-		if (g_cfg.video.shader_precision == gpu_preset_level::ultra)
-		{
-			interpolate_function_block =
-				"\n"
-				"vec4 _interpolate_varying3(const in vec4[3] v)\n"
-				"{\n"
-				"	const double _gl_BaryCoord_x = double($gl_BaryCoord.x);\n"
-				"	const double _gl_BaryCoord_y = double($gl_BaryCoord.y);\n"
-				"	const double _gl_BaryCoord_z = double(1.0) - (_gl_BaryCoord_x + _gl_BaryCoord_y);\n"
-				"	return vec4(_gl_BaryCoord_x * v[0] + _gl_BaryCoord_y * v[1] + _gl_BaryCoord_z * v[2]);\n"
-				"}\n\n";
-		}
-		else
-		{
-			interpolate_function_block =
-				"\n"
-				"vec4 _interpolate_varying3(const in vec4[3] v)\n"
-				"{\n"
-				"	vec3 _gl_BaryCoord = vec3($gl_BaryCoord.xy, 1.f);\n"
-				"	_gl_BaryCoord.z = dot(_gl_BaryCoord, vec3(-1.f, -1.f, 1.f));\n"
-				"	return vec4(_gl_BaryCoord.x * v[0] + _gl_BaryCoord.y * v[1] + _gl_BaryCoord.z * v[2]);\n"
-				"}\n\n";
-		}
+		std::string interpolate_function_block =
+			"\n"
+			"vec4 _interpolate_varying3(const in vec4[3] v)\n"
+			"{\n"
+			"	const vec4 p10 = v[1] - v[0];\n"
+			"	const vec4 p20 = v[2] - v[0];\n"
+			"	return v[0] + p10 * $gl_BaryCoord.y + p20 * $gl_BaryCoord.z;\n"
+			"}\n\n";
 		OS << fmt::replace_all(interpolate_function_block, {{ "$gl_BaryCoord", "gl_BaryCoord"s + std::string(ext_flavour) }});
 
 		for (const auto& reg : varying_list)