lovr.headset.isMirrored; lovr.headset.setMirrored;

Also add conf.lua field to configure initial mirroring state.

src/api/headset.c

@@ -48,6 +48,17 @@ int l_lovrHeadsetGetType(lua_State* L) {
   return 1;
 }
 
+int l_lovrHeadsetIsMirrored(lua_State* L) {
+  lua_pushboolean(L, lovrHeadsetIsMirrored());
+  return 1;
+}
+
+int l_lovrHeadsetSetMirrored(lua_State* L) {
+  int mirror = lua_toboolean(L, 1);
+  lovrHeadsetSetMirrored(mirror);
+  return 0;
+}
+
 int l_lovrHeadsetGetDisplayWidth(lua_State* L) {
   int width;
   lovrHeadsetGetDisplayDimensions(&width, NULL);
@@ -209,6 +220,8 @@ int l_lovrHeadsetRenderTo(lua_State* L) {
 const luaL_Reg lovrHeadset[] = {
   { "isPresent", l_lovrHeadsetIsPresent },
   { "getType", l_lovrHeadsetGetType },
+  { "isMirrored", l_lovrHeadsetIsMirrored },
+  { "setMirrored", l_lovrHeadsetSetMirrored },
   { "getDisplayWidth", l_lovrHeadsetGetDisplayWidth },
   { "getDisplayHeight", l_lovrHeadsetGetDisplayHeight },
   { "getDisplayDimensions", l_lovrHeadsetGetDisplayDimensions },

src/headset/headset.h

@@ -36,6 +36,8 @@ void lovrHeadsetDestroy();
 void lovrHeadsetPoll();
 int lovrHeadsetIsPresent();
 const char* lovrHeadsetGetType();
+int lovrHeadsetIsMirrored();
+void lovrHeadsetSetMirrored(int mirror);
 void lovrHeadsetGetDisplayDimensions(int* width, int* height);
 void lovrHeadsetGetClipDistance(float* near, float* far);
 void lovrHeadsetSetClipDistance(float near, float far);

src/headset/openvr.c

@@ -35,6 +35,7 @@ static TrackedDevicePose_t getPose(unsigned int deviceIndex) {
 void lovrHeadsetInit() {
   state.isInitialized = 0;
   state.isRendering = 0;
+  state.isMirrored = 1;
   state.texture = NULL;
   vec_init(&state.controllers);
 
@@ -174,6 +175,14 @@ const char* lovrHeadsetGetType() {
   return state.isInitialized ? "Vive" : NULL;
 }
 
+int lovrHeadsetIsMirrored() {
+  return state.isMirrored;
+}
+
+void lovrHeadsetSetMirrored(int mirror) {
+  state.isMirrored = mirror;
+}
+
 void lovrHeadsetGetDisplayDimensions(int* width, int* height) {
   if (!state.isInitialized) {
     *width = *height = 0;
@@ -646,5 +655,8 @@ void lovrHeadsetRenderTo(headsetRenderCallback callback, void* userdata) {
 
   state.isRendering = 0;
   lovrGraphicsPopCanvas();
-  lovrGraphicsPlaneFullscreen(state.texture);
+
+  if (state.isMirrored) {
+    lovrGraphicsPlaneFullscreen(state.texture);
+  }
 }

src/headset/openvr.h

@@ -12,6 +12,7 @@
 typedef struct {
   int isInitialized;
   int isRendering;
+  int isMirrored;
 
   struct VR_IVRSystem_FnTable* system;
   struct VR_IVRCompositor_FnTable* compositor;

src/lovr.c

@@ -92,6 +92,9 @@ void lovrInit(lua_State* L, int argc, char** argv) {
     "    headset = true, "
     "    math = true, "
     "    timer = true "
+    "  }, "
+    "  headset = { "
+    "    mirror = true "
     "  } "
     "} "
 
@@ -110,6 +113,7 @@ void lovrInit(lua_State* L, int argc, char** argv) {
     "end "
 
     "lovr.filesystem.setIdentity(conf.identity or 'default') "
+    "if lovr.headset then lovr.headset.setMirrored(conf.headset and conf.headset.mirror) end "
 
     "lovr.handlers = setmetatable({ "
     "  quit = function() end, "