From fcbeccdfb16731999e39fe3c772dd11ff2b414c2 Mon Sep 17 00:00:00 2001
From: bjorn <mail@bjornbyt.es>
Date: Fri, 5 Aug 2022 21:05:02 -0700
Subject: [PATCH] Fix background colors;

---
 etc/nogame.lua                       |  2 +-
 src/api/l_graphics.c                 | 19 +++++++++++++++++++
 src/modules/graphics/graphics.c      | 19 +++++++++++++++++++
 src/modules/graphics/graphics.h      |  3 +++
 src/modules/headset/headset_openxr.c |  4 ++++
 5 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/etc/nogame.lua b/etc/nogame.lua
index a202910d..3871bbcc 100644
--- a/etc/nogame.lua
+++ b/etc/nogame.lua
@@ -14,7 +14,7 @@ function lovr.load()
     return
   end
 
-  lovr.graphics.getWindowPass():setClear(0x20232c)
+  lovr.graphics.setBackground(0x20232c)
 
   --[=[
   logo = lovr.graphics.newShader([[
diff --git a/src/api/l_graphics.c b/src/api/l_graphics.c
index 2397373e..ba3c5988 100644
--- a/src/api/l_graphics.c
+++ b/src/api/l_graphics.c
@@ -805,6 +805,23 @@ 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_lovrGraphicsGetWindowPass(lua_State* L) {
   Pass* pass = lovrGraphicsGetWindowPass();
   luax_pushtype(L, Pass, pass);
@@ -1481,6 +1498,8 @@ static const luaL_Reg lovrGraphics[] = {
   { "getFeatures", l_lovrGraphicsGetFeatures },
   { "getLimits", l_lovrGraphicsGetLimits },
   { "isFormatSupported", l_lovrGraphicsIsFormatSupported },
+  { "getBackground", l_lovrGraphicsGetBackground },
+  { "setBackground", l_lovrGraphicsSetBackground },
   { "getWindowPass", l_lovrGraphicsGetWindowPass },
   { "getDefaultFont", l_lovrGraphicsGetDefaultFont },
   { "getBuffer", l_lovrGraphicsGetBuffer },
diff --git a/src/modules/graphics/graphics.c b/src/modules/graphics/graphics.c
index 78c718ab..bbed9d3d 100644
--- a/src/modules/graphics/graphics.c
+++ b/src/modules/graphics/graphics.c
@@ -362,6 +362,7 @@ static struct {
   gpu_device_info device;
   gpu_features features;
   gpu_limits limits;
+  float background[4];
   Texture* window;
   Pass* windowPass;
   Font* defaultFont;
@@ -754,6 +755,20 @@ void lovrGraphicsGetShaderCache(void* data, size_t* size) {
   gpu_pipeline_get_cache(data, size);
 }
 
+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;
@@ -3409,6 +3424,10 @@ void lovrPassReset(Pass* pass) {
         } else {
           pass->target.color[i].texture = lovrGraphicsGetWindowTexture()->gpu;
         }
+
+        // The window pass always uses the global clear color.  The intent is that exposing a global
+        // clear color that applies to the window/headset is more friendly than messing with passes.
+        lovrGraphicsGetBackground(pass->target.color[0].clear);
       }
 
       if (canvas->mipmap) {
diff --git a/src/modules/graphics/graphics.h b/src/modules/graphics/graphics.h
index 91c9cfc5..95ddd35f 100644
--- a/src/modules/graphics/graphics.h
+++ b/src/modules/graphics/graphics.h
@@ -103,6 +103,9 @@ void lovrGraphicsGetLimits(GraphicsLimits* limits);
 bool lovrGraphicsIsFormatSupported(uint32_t format, uint32_t features);
 void lovrGraphicsGetShaderCache(void* data, size_t* size);
 
+void lovrGraphicsGetBackground(float background[4]);
+void lovrGraphicsSetBackground(float background[4]);
+
 void lovrGraphicsSubmit(Pass** passes, uint32_t count);
 void lovrGraphicsPresent(void);
 void lovrGraphicsWait(void);
diff --git a/src/modules/headset/headset_openxr.c b/src/modules/headset/headset_openxr.c
index 6d94109c..b958d105 100644
--- a/src/modules/headset/headset_openxr.c
+++ b/src/modules/headset/headset_openxr.c
@@ -1697,6 +1697,10 @@ static Pass* openxr_getPass(void) {
     return NULL;
   }
 
+  float color[4][4], depth, stencil;
+  lovrPassGetClear(state.pass, color, &depth, &stencil);
+  lovrGraphicsGetBackground(color[0]);
+  lovrPassSetClear(state.pass, color, depth, stencil);
   lovrPassSetTarget(state.pass, &texture, NULL);
   lovrPassReset(state.pass);