Removed unnecesary normal multiplication (only culling was really needed), fixes #17776

drivers/gles2/rasterizer_scene_gles2.cpp

@@ -2339,7 +2339,6 @@ void RasterizerSceneGLES2::_render_render_list(RenderList::Element **p_elements,
 			state.scene_shader.set_uniform(SceneShaderGLES2::TIME, storage->frame.time[0]);
 
 			state.scene_shader.set_uniform(SceneShaderGLES2::SCREEN_PIXEL_SIZE, screen_pixel_size);
-			state.scene_shader.set_uniform(SceneShaderGLES2::NORMAL_MULT, 1.0); // TODO mirror?
 		}
 
 		if (rebind_light && light) {

drivers/gles2/shaders/scene.glsl

@@ -84,7 +84,7 @@ uniform highp mat4 world_transform;
 
 uniform highp float time;
 
-uniform float normal_mult;
+
 
 #ifdef RENDER_DEPTH
 uniform float light_bias;
@@ -330,11 +330,10 @@ void main() {
 
 #endif
 
-	vec3 normal = normal_attrib * normal_mult;
+	vec3 normal = normal_attrib;
 
 #if defined(ENABLE_TANGENT_INTERP) || defined(ENABLE_NORMALMAP)
 	vec3 tangent = tangent_attrib.xyz;
-	tangent *= normal_mult;
 	float binormalf = tangent_attrib.a;
 	vec3 binormal = normalize(cross(normal, tangent) * binormalf);
 #endif

drivers/gles3/rasterizer_scene_gles3.cpp

@@ -2223,7 +2223,6 @@ void RasterizerSceneGLES3::_render_list(RenderList::Element **p_elements, int p_
 
 		_set_cull(e->sort_key & RenderList::SORT_KEY_MIRROR_FLAG, e->sort_key & RenderList::SORT_KEY_CULL_DISABLED_FLAG, p_reverse_cull);
 
-		state.scene_shader.set_uniform(SceneShaderGLES3::NORMAL_MULT, e->instance->mirror ? -1.0 : 1.0);
 		state.scene_shader.set_uniform(SceneShaderGLES3::WORLD_TRANSFORM, e->instance->transform);
 
 		_render_geometry(e);

drivers/gles3/shaders/scene.glsl

@@ -42,8 +42,6 @@ layout(location = 4) in vec2 uv_attrib;
 layout(location = 5) in vec2 uv2_attrib;
 #endif
 
-uniform float normal_mult;
-
 #ifdef USE_SKELETON
 layout(location = 6) in uvec4 bone_indices; // attrib:6
 layout(location = 7) in vec4 bone_weights; // attrib:7
@@ -280,11 +278,10 @@ void main() {
 	}
 #endif
 
-	vec3 normal = normal_attrib * normal_mult;
+	vec3 normal = normal_attrib;
 
 #if defined(ENABLE_TANGENT_INTERP) || defined(ENABLE_NORMALMAP) || defined(LIGHT_USE_ANISOTROPY)
 	vec3 tangent = tangent_attrib.xyz;
-	tangent *= normal_mult;
 	float binormalf = tangent_attrib.a;
 #endif