Merge pull request #21204 from Mugen87/dev43

WebGLRenderer: Reduce extension warnings.

src/renderers/webgl/WebGLCapabilities.js

@@ -6,9 +6,9 @@ function WebGLCapabilities( gl, extensions, parameters ) {
 
 		if ( maxAnisotropy !== undefined ) return maxAnisotropy;
 
-		const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
+		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
 
-		if ( extension !== null ) {
+			const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
 
 			maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );
 
@@ -80,7 +80,7 @@ function WebGLCapabilities( gl, extensions, parameters ) {
 	const maxFragmentUniforms = gl.getParameter( gl.MAX_FRAGMENT_UNIFORM_VECTORS );
 
 	const vertexTextures = maxVertexTextures > 0;
-	const floatFragmentTextures = isWebGL2 || !! extensions.get( 'OES_texture_float' );
+	const floatFragmentTextures = isWebGL2 || extensions.has( 'OES_texture_float' );
 	const floatVertexTextures = vertexTextures && floatFragmentTextures;
 
 	const maxSamples = isWebGL2 ? gl.getParameter( gl.MAX_SAMPLES ) : 0;

src/renderers/webgl/WebGLTextures.js

@@ -453,12 +453,12 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 
 		}
 
-		const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
+		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
 
-		if ( extension ) {
+			const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
 
-			if ( texture.type === FloatType && extensions.get( 'OES_texture_float_linear' ) === null ) return;
-			if ( texture.type === HalfFloatType && ( isWebGL2 || extensions.get( 'OES_texture_half_float_linear' ) ) === null ) return;
+			if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false ) return; // verify extension for WebGL 1 and WebGL 2
+			if ( isWebGL2 === false && ( texture.type === HalfFloatType && extensions.has( 'OES_texture_half_float_linear' ) === false ) ) return; // verify extension for WebGL 1 only
 
 			if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {