Allow disabling of depth test;

src/glfw.c

@@ -42,5 +42,4 @@ void initGlfw(GLFWerrorfun onError, GLFWwindowclosefun onClose, void* userPointe
   glEnable(GL_BLEND);
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glEnable(GL_LINE_SMOOTH);
-  glEnable(GL_DEPTH_TEST);
 }

src/graphics/graphics.c

@@ -22,6 +22,7 @@ void lovrGraphicsInit() {
   glGenVertexArrays(1, &state.shapeArray);
   vec_init(&state.shapeData);
   vec_init(&state.shapeIndices);
+  state.depthTest = -1;
   lovrGraphicsReset();
 }
 
@@ -235,6 +236,11 @@ void lovrGraphicsSetDepthTest(CompareMode depthTest) {
   if (state.depthTest != depthTest) {
     state.depthTest = depthTest;
     glDepthFunc(depthTest);
+    if (depthTest) {
+      glEnable(GL_DEPTH_TEST);
+    } else {
+      glDisable(GL_DEPTH_TEST);
+    }
   }
 }
 

src/graphics/graphics.h

@@ -25,6 +25,7 @@ typedef enum {
 } PolygonWinding;
 
 typedef enum {
+  COMPARE_NONE = 0,
   COMPARE_EQUAL = GL_EQUAL,
   COMPARE_NOT_EQUAL = GL_NOTEQUAL,
   COMPARE_LESS = GL_LESS,

src/lovr/graphics.c

@@ -327,13 +327,22 @@ int l_lovrGraphicsSetPolygonWinding(lua_State* L) {
 }
 
 int l_lovrGraphicsGetDepthTest(lua_State* L) {
-  lua_pushstring(L, map_int_find(&CompareModes, lovrGraphicsGetDepthTest()));
+  CompareMode depthTest = lovrGraphicsGetDepthTest();
+  if (depthTest) {
+    lua_pushstring(L, map_int_find(&CompareModes, depthTest));
+  } else {
+    lua_pushnil(L);
+  }
   return 1;
 }
 
 int l_lovrGraphicsSetDepthTest(lua_State* L) {
+  if (lua_isnoneornil(L, 1)) {
+    lovrGraphicsSetDepthTest(COMPARE_NONE);
+  } else {
     CompareMode* depthTest = (CompareMode*) luax_checkenum(L, 1, &CompareModes, "compare mode");
     lovrGraphicsSetDepthTest(*depthTest);
+  }
   return 0;
 }