From 1b7261de5c69c473cf93263bfccab2b6265f60a5 Mon Sep 17 00:00:00 2001
From: bjorn <tie.372@gmail.com>
Date: Fri, 3 Aug 2018 11:43:15 -0700
Subject: [PATCH] lovr.graphics.getSupported;

---
 src/api/graphics.c      |  9 +++++++++
 src/graphics/graphics.h |  5 +++++
 src/graphics/opengl.c   | 10 ++++++++++
 3 files changed, 24 insertions(+)

diff --git a/src/api/graphics.c b/src/api/graphics.c
index 57bb8a7f..644c99ba 100644
--- a/src/api/graphics.c
+++ b/src/api/graphics.c
@@ -327,6 +327,14 @@ int l_lovrGraphicsGetDimensions(lua_State* L) {
   return 2;
 }
 
+int l_lovrGraphicsGetSupported(lua_State* L) {
+  GraphicsFeatures features = lovrGraphicsGetSupported();
+  lua_newtable(L);
+  lua_pushboolean(L, features.writableBlocks);
+  lua_setfield(L, -2, "writableBlocks");
+  return 1;
+}
+
 int l_lovrGraphicsGetSystemLimits(lua_State* L) {
   GraphicsLimits limits = lovrGraphicsGetLimits();
   lua_newtable(L);
@@ -1202,6 +1210,7 @@ const luaL_Reg lovrGraphics[] = {
   { "getWidth", l_lovrGraphicsGetWidth },
   { "getHeight", l_lovrGraphicsGetHeight },
   { "getDimensions", l_lovrGraphicsGetDimensions },
+  { "getSupported", l_lovrGraphicsGetSupported },
   { "getSystemLimits", l_lovrGraphicsGetSystemLimits },
   { "getStats", l_lovrGraphicsGetStats },
 
diff --git a/src/graphics/graphics.h b/src/graphics/graphics.h
index f8868601..9ca8cf88 100644
--- a/src/graphics/graphics.h
+++ b/src/graphics/graphics.h
@@ -67,6 +67,10 @@ typedef enum {
   WINDING_COUNTERCLOCKWISE
 } Winding;
 
+typedef struct {
+  bool writableBlocks;
+} GraphicsFeatures;
+
 typedef struct {
   bool initialized;
   float pointSizes[2];
@@ -165,6 +169,7 @@ void lovrGraphicsCreateWindow(int w, int h, bool fullscreen, int msaa, const cha
 void lovrGraphicsGetDimensions(int* width, int* height);
 int lovrGraphicsGetMSAA();
 void lovrGraphicsSetCamera(Camera* camera, bool clear);
+GraphicsFeatures lovrGraphicsGetSupported();
 GraphicsLimits lovrGraphicsGetLimits();
 GraphicsStats lovrGraphicsGetStats();
 
diff --git a/src/graphics/opengl.c b/src/graphics/opengl.c
index 3f35a2ca..542cfc64 100644
--- a/src/graphics/opengl.c
+++ b/src/graphics/opengl.c
@@ -801,6 +801,16 @@ void lovrGpuPresent() {
 #endif
 }
 
+GraphicsFeatures lovrGraphicsGetSupported() {
+  return (GraphicsFeatures) {
+#ifdef EMSCRIPTEN
+    .writableBlocks = GLAD_GL_ARB_shader_storage_blocks
+#else
+    .writableBlocks = false
+#endif
+  };
+}
+
 GraphicsLimits lovrGraphicsGetLimits() {
   if (!state.limits.initialized) {
 #ifdef EMSCRIPTEN