diff --git a/lightgl.js b/lightgl.js
index 5c6a6e5..7413914 100644
--- a/lightgl.js
+++ b/lightgl.js
@@ -1905,6 +1905,13 @@ Texture.canUseFloatingPointLinearFiltering = function() {
   return !!gl.getExtension('OES_texture_float_linear');
 };
 
+// ### GL.Texture.canUseFloatingPointRTT()
+//
+// Returns false if float32 textures can't be rendered to.
+Texture.canUseFloatingPointRTT = function() {
+  return !!gl.getExtension('WEBGL_color_buffer_float');
+};
+
 // ### GL.Texture.canUseFloatingPointTextures()
 //
 // Returns false if `gl.HALF_FLOAT_OES` is not supported as a texture type.
@@ -1922,6 +1929,13 @@ Texture.canUseHalfFloatingPointLinearFiltering = function() {
   return !!gl.getExtension('OES_texture_half_float_linear');
 };
 
+// ### GL.Texture.canUseHalfFloatingPointRTT()
+//
+// Returns false if float16 textures can't be rendered to.
+Texture.canUseHalfFloatingPointRTT = function() {
+  return !!gl.getExtension('EXT_color_buffer_half_float');
+};
+
 // src/vector.js
 // Provides a simple 3D vector class. Vector operations can be done using member
 // functions, which return new vectors, or static functions, which reuse
diff --git a/water.js b/water.js
index 8f882eb..e4157e3 100644
--- a/water.js
+++ b/water.js
@@ -16,17 +16,18 @@ function Water() {
     }\
   ';
   this.plane = GL.Mesh.plane();
-  if (!GL.Texture.canUseFloatingPointTextures()) {
-    throw new Error('This demo requires the OES_texture_float extension');
+  if (!GL.Texture.canUseFloatingPointRTT() && !GL.Texture.canUseHalfFloatingPointRTT()) {
+    throw new Error('This demo requires either the WEBGL_color_buffer_float or the EXT_color_buffer_half_float extension');
   }
   var filter = GL.Texture.canUseFloatingPointLinearFiltering() ? gl.LINEAR : gl.NEAREST;
   this.textureA = new GL.Texture(256, 256, { type: gl.FLOAT, filter: filter });
   this.textureB = new GL.Texture(256, 256, { type: gl.FLOAT, filter: filter });
-  if ((!this.textureA.canDrawTo() || !this.textureB.canDrawTo()) && GL.Texture.canUseHalfFloatingPointTextures()) {
+  if ((!this.textureA.canDrawTo() || !this.textureB.canDrawTo()) && GL.Texture.canUseHalfFloatingPointRTT()) {
     filter = GL.Texture.canUseHalfFloatingPointLinearFiltering() ? gl.LINEAR : gl.NEAREST;
     this.textureA = new GL.Texture(256, 256, { type: gl.HALF_FLOAT_OES, filter: filter });
     this.textureB = new GL.Texture(256, 256, { type: gl.HALF_FLOAT_OES, filter: filter });
   }
+
   this.dropShader = new GL.Shader(vertexShader, '\
     const float PI = 3.141592653589793;\
     uniform sampler2D texture;\