lovr.graphics.get/setBackground;

src/api/l_graphics.c

@@ -346,7 +346,7 @@ static Canvas luax_checkcanvas(lua_State* L, int index) {
   };
 
   for (uint32_t i = 0; i < 4; i++) {
-    // lovrGraphicsGetBackground(canvas.clears[i]);
+    lovrGraphicsGetBackground(canvas.clears[i]); // srgb conversion here does not spark joy
   }
 
   if (lua_type(L, index) == LUA_TSTRING && !strcmp(lua_tostring(L, index), "window")) {
@@ -587,6 +587,23 @@ static int l_lovrGraphicsIsFormatSupported(lua_State* L) {
   return 1;
 }
 
+static int l_lovrGraphicsGetBackground(lua_State* L) {
+  float color[4];
+  lovrGraphicsGetBackground(color);
+  lua_pushnumber(L, color[0]);
+  lua_pushnumber(L, color[1]);
+  lua_pushnumber(L, color[2]);
+  lua_pushnumber(L, color[3]);
+  return 4;
+}
+
+static int l_lovrGraphicsSetBackground(lua_State* L) {
+  float color[4];
+  luax_readcolor(L, 1, color);
+  lovrGraphicsSetBackground(color);
+  return 0;
+}
+
 static int l_lovrGraphicsPass(lua_State* L) {
   PassInfo info;
   info.type = luax_checkenum(L, 1, PassType, NULL);
@@ -970,6 +987,8 @@ static const luaL_Reg lovrGraphics[] = {
   { "getFeatures", l_lovrGraphicsGetFeatures },
   { "getLimits", l_lovrGraphicsGetLimits },
   { "isFormatSupported", l_lovrGraphicsIsFormatSupported },
+  { "getBackground", l_lovrGraphicsGetBackground },
+  { "setBackground", l_lovrGraphicsSetBackground },
   { "buffer", l_lovrGraphicsBuffer },
   { "newBuffer", l_lovrGraphicsNewBuffer },
   { "newTexture", l_lovrGraphicsNewTexture },

src/modules/graphics/graphics.c

@@ -85,6 +85,7 @@ static struct {
   gpu_device_info device;
   gpu_features features;
   gpu_limits limits;
+  float background[4];
   Texture* window;
   Attachment attachments[16];
   Allocator allocator;
@@ -217,6 +218,20 @@ bool lovrGraphicsIsFormatSupported(uint32_t format, uint32_t features) {
   return true;
 }
 
+void lovrGraphicsGetBackground(float background[4]) {
+  background[0] = lovrMathLinearToGamma(state.background[0]);
+  background[1] = lovrMathLinearToGamma(state.background[1]);
+  background[2] = lovrMathLinearToGamma(state.background[2]);
+  background[3] = state.background[3];
+}
+
+void lovrGraphicsSetBackground(float background[4]) {
+  state.background[0] = lovrMathGammaToLinear(background[0]);
+  state.background[1] = lovrMathGammaToLinear(background[1]);
+  state.background[2] = lovrMathGammaToLinear(background[2]);
+  state.background[3] = background[3];
+}
+
 void lovrGraphicsSubmit(Pass** passes, uint32_t count) {
   if (!state.active) {
     return;

src/modules/graphics/graphics.h

@@ -78,6 +78,9 @@ void lovrGraphicsGetFeatures(GraphicsFeatures* features);
 void lovrGraphicsGetLimits(GraphicsLimits* limits);
 bool lovrGraphicsIsFormatSupported(uint32_t format, uint32_t features);
 
+void lovrGraphicsGetBackground(float background[4]);
+void lovrGraphicsSetBackground(float background[4]);
+
 void lovrGraphicsSubmit(Pass** passes, uint32_t count);
 void lovrGraphicsWait(void);