| function WebGLExtensions( gl ) { | |
| const extensions = {}; | |
| function getExtension( name ) { | |
| if ( extensions[ name ] !== undefined ) { | |
| return extensions[ name ]; | |
| } | |
| let extension; | |
| switch ( name ) { | |
| case 'WEBGL_depth_texture': | |
| extension = gl.getExtension( 'WEBGL_depth_texture' ) || gl.getExtension( 'MOZ_WEBGL_depth_texture' ) || gl.getExtension( 'WEBKIT_WEBGL_depth_texture' ); | |
| break; | |
| case 'EXT_texture_filter_anisotropic': | |
| extension = gl.getExtension( 'EXT_texture_filter_anisotropic' ) || gl.getExtension( 'MOZ_EXT_texture_filter_anisotropic' ) || gl.getExtension( 'WEBKIT_EXT_texture_filter_anisotropic' ); | |
| break; | |
| case 'WEBGL_compressed_texture_s3tc': | |
| extension = gl.getExtension( 'WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'MOZ_WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_s3tc' ); | |
| break; | |
| case 'WEBGL_compressed_texture_pvrtc': | |
| extension = gl.getExtension( 'WEBGL_compressed_texture_pvrtc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_pvrtc' ); | |
| break; | |
| default: | |
| extension = gl.getExtension( name ); | |
| } | |
| extensions[ name ] = extension; | |
| return extension; | |
| } | |
| return { | |
| has: function ( name ) { | |
| return getExtension( name ) !== null; | |
| }, | |
| init: function ( capabilities ) { | |
| if ( capabilities.isWebGL2 ) { | |
| getExtension( 'EXT_color_buffer_float' ); | |
| getExtension( 'WEBGL_clip_cull_distance' ); | |
| } else { | |
| getExtension( 'WEBGL_depth_texture' ); | |
| getExtension( 'OES_texture_float' ); | |
| getExtension( 'OES_texture_half_float' ); | |
| getExtension( 'OES_texture_half_float_linear' ); | |
| getExtension( 'OES_standard_derivatives' ); | |
| getExtension( 'OES_element_index_uint' ); | |
| getExtension( 'OES_vertex_array_object' ); | |
| getExtension( 'ANGLE_instanced_arrays' ); | |
| } | |
| getExtension( 'OES_texture_float_linear' ); | |
| getExtension( 'EXT_color_buffer_half_float' ); | |
| getExtension( 'WEBGL_multisampled_render_to_texture' ); | |
| }, | |
| get: function ( name ) { | |
| const extension = getExtension( name ); | |
| if ( extension === null ) { | |
| console.warn( 'THREE.WebGLRenderer: ' + name + ' extension not supported.' ); | |
| } | |
| return extension; | |
| } | |
| }; | |
| } | |
| export { WebGLExtensions }; | |