Merge pull request #8534 from AnalyticalGraphicsInc/8105/EXT_float_blend

8105 - Explicitly enable EXT_float_blend to silence WebGL warnings

Author: lilleyse

CHANGES.md

@@ -20,6 +20,7 @@ Change Log
 
 ##### Fixes :wrench:
 * Fixed a bug where the camera could go underground during mouse navigation. [#8504](https://github.com/AnalyticalGraphicsInc/cesium/pull/8504)
+* Fixed WebGL warning message about `EXT_float_blend` being implicitly enabled. [#8534](https://github.com/AnalyticalGraphicsInc/cesium/pull/8534)
 
 ### 1.65.0 - 2020-01-06
 

Source/Renderer/Context.js

@@ -251,6 +251,7 @@ import VertexArray from './VertexArray.js';
         this._textureHalfFloatLinear = !!getExtension(gl, ['OES_texture_half_float_linear']);
 
         this._colorBufferFloat = !!getExtension(gl, ['EXT_color_buffer_float', 'WEBGL_color_buffer_float']);
+        this._floatBlend = !!getExtension(gl, ['EXT_float_blend']);
         this._colorBufferHalfFloat = !!getExtension(gl, ['EXT_color_buffer_half_float']);
 
         this._s3tc = !!getExtension(gl, ['WEBGL_compressed_texture_s3tc', 'MOZ_WEBGL_compressed_texture_s3tc', 'WEBKIT_WEBGL_compressed_texture_s3tc']);
@@ -500,6 +501,19 @@ import VertexArray from './VertexArray.js';
             }
         },
 
+        /**
+         * <code>true</code> if the EXT_float_blend extension is supported. This
+         * extension enables blending with 32-bit float values.
+         * @memberof Context.prototype
+         * @type {Boolean}
+         * @see {@link https://www.khronos.org/registry/webgl/extensions/EXT_float_blend/}
+         */
+        floatBlend : {
+            get : function() {
+                return this._floatBlend;
+            }
+        },
+
         /**
          * <code>true</code> if the EXT_blend_minmax extension is supported.  This
          * extension extends blending capabilities by adding two new blend equations: