Merge branch 'master' of https://github.com/dpjudas/VkDoom into gzd-master-experimental

wadsrc/static/shaders/scene/binding_textures.glsl

@@ -21,3 +21,6 @@ const int texture17 = 16;
 const int texture18 = 17;
 const int texture19 = 18;
 const int texture20 = 19;
+
+/* For user shaders so they can check if the engine uses bindless textures */
+#define USES_BINDLESS

wadsrc/static/shaders/scene/layout_frag.glsl

@@ -31,6 +31,11 @@ vec4 texture(int index, vec2 p)
 	return texture(textures[uTextureIndex + index], p);
 }
 
+vec4 texture(int index, vec2 p, float bias)
+{
+    return texture(textures[uTextureIndex + index], p, bias);
+}
+
 ivec2 textureSize(int index, int lod)
 {
 	return textureSize(textures[uTextureIndex + index], lod);