117 lines
2.9 KiB
JavaScript
117 lines
2.9 KiB
JavaScript
/**
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* @author mrdoob / http://mrdoob.com/
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*/
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function WebGLCapabilities( gl, extensions, parameters ) {
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var maxAnisotropy;
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function getMaxAnisotropy() {
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if ( maxAnisotropy !== undefined ) return maxAnisotropy;
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var extension = extensions.get( 'EXT_texture_filter_anisotropic' );
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if ( extension !== null ) {
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maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );
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} else {
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maxAnisotropy = 0;
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}
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return maxAnisotropy;
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}
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function getMaxPrecision( precision ) {
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if ( precision === 'highp' ) {
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if ( gl.getShaderPrecisionFormat( gl.VERTEX_SHADER, gl.HIGH_FLOAT ).precision > 0 &&
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gl.getShaderPrecisionFormat( gl.FRAGMENT_SHADER, gl.HIGH_FLOAT ).precision > 0 ) {
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return 'highp';
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}
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precision = 'mediump';
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}
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if ( precision === 'mediump' ) {
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if ( gl.getShaderPrecisionFormat( gl.VERTEX_SHADER, gl.MEDIUM_FLOAT ).precision > 0 &&
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gl.getShaderPrecisionFormat( gl.FRAGMENT_SHADER, gl.MEDIUM_FLOAT ).precision > 0 ) {
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return 'mediump';
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}
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}
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return 'lowp';
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}
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var isWebGL2 = typeof WebGL2RenderingContext !== 'undefined' && gl instanceof WebGL2RenderingContext;
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var precision = parameters.precision !== undefined ? parameters.precision : 'highp';
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var maxPrecision = getMaxPrecision( precision );
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if ( maxPrecision !== precision ) {
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console.warn( 'THREE.WebGLRenderer:', precision, 'not supported, using', maxPrecision, 'instead.' );
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precision = maxPrecision;
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}
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var logarithmicDepthBuffer = parameters.logarithmicDepthBuffer === true;
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var maxTextures = gl.getParameter( gl.MAX_TEXTURE_IMAGE_UNITS );
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var maxVertexTextures = gl.getParameter( gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS );
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var maxTextureSize = gl.getParameter( gl.MAX_TEXTURE_SIZE );
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var maxCubemapSize = gl.getParameter( gl.MAX_CUBE_MAP_TEXTURE_SIZE );
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var maxAttributes = gl.getParameter( gl.MAX_VERTEX_ATTRIBS );
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var maxVertexUniforms = gl.getParameter( gl.MAX_VERTEX_UNIFORM_VECTORS );
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var maxVaryings = gl.getParameter( gl.MAX_VARYING_VECTORS );
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var maxFragmentUniforms = gl.getParameter( gl.MAX_FRAGMENT_UNIFORM_VECTORS );
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var vertexTextures = maxVertexTextures > 0;
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var floatFragmentTextures = isWebGL2 || !! extensions.get( 'OES_texture_float' );
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var floatVertexTextures = vertexTextures && floatFragmentTextures;
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return {
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isWebGL2: isWebGL2,
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getMaxAnisotropy: getMaxAnisotropy,
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getMaxPrecision: getMaxPrecision,
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precision: precision,
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logarithmicDepthBuffer: logarithmicDepthBuffer,
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maxTextures: maxTextures,
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maxVertexTextures: maxVertexTextures,
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maxTextureSize: maxTextureSize,
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maxCubemapSize: maxCubemapSize,
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maxAttributes: maxAttributes,
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maxVertexUniforms: maxVertexUniforms,
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maxVaryings: maxVaryings,
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maxFragmentUniforms: maxFragmentUniforms,
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vertexTextures: vertexTextures,
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floatFragmentTextures: floatFragmentTextures,
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floatVertexTextures: floatVertexTextures
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};
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}
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export { WebGLCapabilities };
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