Testing PR: Require rgb renderable webgl1. (#3372)

Testing this pull request:
#3364
off the main branch of the KhronosGroup/WebGL repository.

Require all RGB and RGBA textures to be renderable in webgl1.

Authored-by: Kelsey Gilbert <jdashg@gmail.com>

Author: kenrussell

sdk/tests/conformance/textures/misc/format-filterable-renderable.html

@@ -98,10 +98,10 @@
 // GLES 2.0.25 p63
 const FORMAT_INFO_WEBGL1 = {
     RGBA8  : { filter: true, render: true     , unpack: ['RGBA', 'UNSIGNED_BYTE'] },
-    RGB8   : { filter: true, render: undefined, unpack: ['RGB', 'UNSIGNED_BYTE'] },
-    RGBA4  : { filter: true, render: undefined, unpack: ['RGBA', 'UNSIGNED_SHORT_4_4_4_4'] },
-    RGB5_A1: { filter: true, render: undefined, unpack: ['RGBA', 'UNSIGNED_SHORT_5_5_5_1'] },
-    RGB565 : { filter: true, render: undefined, unpack: ['RGB', 'UNSIGNED_SHORT_5_6_5'] },
+    RGB8   : { filter: true, render: true     , unpack: ['RGB', 'UNSIGNED_BYTE'] },
+    RGBA4  : { filter: true, render: true     , unpack: ['RGBA', 'UNSIGNED_SHORT_4_4_4_4'] },
+    RGB5_A1: { filter: true, render: true     , unpack: ['RGBA', 'UNSIGNED_SHORT_5_5_5_1'] },
+    RGB565 : { filter: true, render: true     , unpack: ['RGB', 'UNSIGNED_SHORT_5_6_5'] },
     LA8    : { filter: true, render: false    , unpack: ['LUMINANCE_ALPHA', 'UNSIGNED_BYTE'] },
     L8     : { filter: true, render: false    , unpack: ['LUMINANCE', 'UNSIGNED_BYTE'] },
     A8     : { filter: true, render: false    , unpack: ['ALPHA', 'UNSIGNED_BYTE'] },

specs/latest/1.0/index.html

@@ -3892,9 +3892,19 @@ <h3><a name="FBO_ATTACHMENTS">Framebuffer Object Attachments</a></h3>
 framebuffer being framebuffer complete:
 
 <ul>
-<li> <code>COLOR_ATTACHMENT0</code> = <code>RGBA/UNSIGNED_BYTE</code> texture
-<li> <code>COLOR_ATTACHMENT0</code> = <code>RGBA/UNSIGNED_BYTE</code> texture + <code>DEPTH_ATTACHMENT</code> = <code>DEPTH_COMPONENT16</code> renderbuffer
-<li> <code>COLOR_ATTACHMENT0</code> = <code>RGBA/UNSIGNED_BYTE</code> texture + <code>DEPTH_STENCIL_ATTACHMENT</code> = <code>DEPTH_STENCIL</code> renderbuffer
+<li> renderbuffer or color-renderable texture
+<li> renderbuffer or color-renderable texture + <code>DEPTH_ATTACHMENT</code> = <code>DEPTH_COMPONENT16</code> renderbuffer
+<li> renderbuffer or color-renderable texture + <code>DEPTH_STENCIL_ATTACHMENT</code> = <code>DEPTH_STENCIL</code> renderbuffer
+</ul>
+
+A texture is color-renderable if it has any of the following format-type pairs:
+
+<ul>
+<li> <code>RGBA</code>, <code>UNSIGNED_BYTE</code>
+<li> <code>RGB</code>, <code>UNSIGNED_BYTE</code>
+<li> <code>RGBA</code>, <code>UNSIGNED_SHORT_4_4_4_4</code>
+<li> <code>RGBA</code>, <code>UNSIGNED_SHORT_4_4_4_4</code>
+<li> <code>RGB</code>, <code>UNSIGNED_SHORT_5_6_5</code>
 </ul>
 
 <h3><a name="TEXTURE_UPLOAD_SIZE">Texture Upload Width and Height</a></h3>