Improve lovr.graphics.clear;

src/graphics/graphics.c

@@ -24,8 +24,18 @@ void lovrGraphicsInit() {
   map_set(&BufferDrawModes, "fan", GL_TRIANGLE_FAN);
 }
 
-void lovrGraphicsClear() {
-  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+void lovrGraphicsClear(int color, int depth) {
+  int bits = 0;
+
+  if (color) {
+    bits |= GL_COLOR_BUFFER_BIT;
+  }
+
+  if (depth) {
+    bits |= GL_DEPTH_BUFFER_BIT;
+  }
+
+  glClear(bits);
 }
 
 void lovrGraphicsPresent() {

src/graphics/graphics.h

@@ -3,7 +3,7 @@
 #include "shader.h"
 
 void lovrGraphicsInit();
-void lovrGraphicsClear();
+void lovrGraphicsClear(int color, int depth);
 void lovrGraphicsPresent();
 void lovrGraphicsGetClearColor(float* r, float* g, float* b, float* a);
 void lovrGraphicsSetClearColor(float r, float g, float b, float a);

src/lovr/graphics.c

@@ -28,7 +28,9 @@ int l_lovrGraphicsInit(lua_State* L) {
 }
 
 int l_lovrGraphicsClear(lua_State* L) {
-  lovrGraphicsClear();
+  int color = lua_gettop(L) < 1 || lua_toboolean(L, 1);
+  int depth = lua_gettop(L) < 2 || lua_toboolean(L, 2);
+  lovrGraphicsClear(color, depth);
   return 0;
 }