lovr.graphics.origin;

src/graphics/graphics.c

@@ -19,6 +19,7 @@ static GraphicsState graphicsState;
 
 void lovrGraphicsInit() {
   vec_init(&graphicsState.transforms);
+  vec_push(&graphicsState.transforms, mat4_init());
 }
 
 void lovrGraphicsClear(int color, int depth) {
@@ -64,18 +65,23 @@ void lovrGraphicsSetShader(Shader* shader) {
 
 int lovrGraphicsPush() {
   vec_mat4_t* transforms = &graphicsState.transforms;
-  if (transforms->length > 64) { return 1; }
-  vec_push(transforms, transforms->length > 0 ? mat4_copy(vec_last(transforms)) : mat4_init());
+  if (transforms->length >= 64) { return 1; }
+  vec_push(transforms, mat4_copy(vec_last(transforms)));
   return 0;
 }
 
 int lovrGraphicsPop() {
   vec_mat4_t* transforms = &graphicsState.transforms;
-  if (transforms->length == 0) { return 1; }
+  if (transforms->length <= 1) { return 1; }
   mat4_deinit(vec_pop(transforms));
   return 0;
 }
 
+void lovrGraphicsOrigin() {
+  vec_mat4_t* transforms = &graphicsState.transforms;
+  mat4_setIdentity(vec_last(transforms));
+}
+
 Buffer* lovrGraphicsNewBuffer(int size, BufferDrawMode drawMode, BufferUsage usage) {
   Buffer* buffer = malloc(sizeof(Buffer));
 

src/graphics/graphics.h

@@ -17,6 +17,7 @@ Shader* lovrGraphicsGetShader();
 void lovrGraphicsSetShader(Shader* shader);
 int lovrGraphicsPush();
 int lovrGraphicsPop();
+void lovrGraphicsOrigin();
 Buffer* lovrGraphicsNewBuffer(int size, BufferDrawMode drawMode, BufferUsage usage);
 Model* lovrGraphicsNewModel(const char* path);
 Shader* lovrGraphicsNewShader(const char* vertexSource, const char* fragmentSource);

src/lovr/graphics.c

@@ -13,6 +13,7 @@ const luaL_Reg lovrGraphics[] = {
   { "setShader", l_lovrGraphicsSetShader },
   { "push", l_lovrGraphicsPush },
   { "pop", l_lovrGraphicsPop },
+  { "origin", l_lovrGraphicsOrigin },
   { "newModel", l_lovrGraphicsNewModel },
   { "newBuffer", l_lovrGraphicsNewBuffer },
   { "newShader", l_lovrGraphicsNewShader },
@@ -102,6 +103,11 @@ int l_lovrGraphicsPop(lua_State* L) {
   return 0;
 }
 
+int l_lovrGraphicsOrigin(lua_State* L) {
+  lovrGraphicsOrigin();
+  return 0;
+}
+
 int l_lovrGraphicsNewBuffer(lua_State* L) {
   const char* userDrawMode = luaL_optstring(L, 2, "fan");
   BufferDrawMode* drawMode = (BufferDrawMode*) map_get(&BufferDrawModes, userDrawMode);

src/lovr/graphics.h

@@ -16,6 +16,7 @@ int l_lovrGraphicsGetShader(lua_State* L);
 int l_lovrGraphicsSetShader(lua_State* L);
 int l_lovrGraphicsPush(lua_State* L);
 int l_lovrGraphicsPop(lua_State* L);
+int l_lovrGraphicsOrigin(lua_State* L);
 int l_lovrGraphicsNewBuffer(lua_State* L);
 int l_lovrGraphicsNewModel(lua_State* L);
 int l_lovrGraphicsNewShader(lua_State* L);