import { FloatType, HalfFloatType, RGBAFormat, UnsignedByteType } from '../../constants.js';
function WebGLCapabilities( gl, extensions, parameters, utils ) {
let maxAnisotropy;
function getMaxAnisotropy() {
if ( maxAnisotropy !== undefined ) return maxAnisotropy;
if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );
} else {
maxAnisotropy = 0;
}
return maxAnisotropy;
}
function textureFormatReadable( textureFormat ) {
if ( textureFormat !== RGBAFormat && utils.convert( textureFormat ) !== gl.getParameter( gl.IMPLEMENTATION_COLOR_READ_FORMAT ) ) {
return false;
}
return true;
}
function textureTypeReadable( textureType ) {
const halfFloatSupportedByExt = ( textureType === HalfFloatType ) && ( extensions.has( 'EXT_color_buffer_half_float' ) || extensions.has( 'EXT_color_buffer_float' ) );
if ( textureType !== UnsignedByteType && utils.convert( textureType ) !== gl.getParameter( gl.IMPLEMENTATION_COLOR_READ_TYPE ) && // Edge and Chrome Mac < 52 (#9513)
textureType !== FloatType && ! halfFloatSupportedByExt ) {
return false;
}
return true;
}
function getMaxPrecision( precision ) {
if ( precision === 'highp' ) {
if ( gl.getShaderPrecisionFormat( gl.VERTEX_SHADER, gl.HIGH_FLOAT ).precision > 0 &&
gl.getShaderPrecisionFormat( gl.FRAGMENT_SHADER, gl.HIGH_FLOAT ).precision > 0 ) {
return 'highp';
}
precision = 'mediump';
}
if ( precision === 'mediump' ) {
if ( gl.getShaderPrecisionFormat( gl.VERTEX_SHADER, gl.MEDIUM_FLOAT ).precision > 0 &&
gl.getShaderPrecisionFormat( gl.FRAGMENT_SHADER, gl.MEDIUM_FLOAT ).precision > 0 ) {
return 'mediump';
}
}
return 'lowp';
}
let precision = parameters.precision !== undefined ? parameters.precision : 'highp';
const maxPrecision = getMaxPrecision( precision );
if ( maxPrecision !== precision ) {
console.warn( 'THREE.WebGLRenderer:', precision, 'not supported, using', maxPrecision, 'instead.' );
precision = maxPrecision;
}
const logarithmicDepthBuffer = parameters.logarithmicDepthBuffer === true;
const reverseDepthBuffer = parameters.reverseDepthBuffer === true && extensions.has( 'EXT_clip_control' );
const maxTextures = gl.getParameter( gl.MAX_TEXTURE_IMAGE_UNITS );
const maxVertexTextures = gl.getParameter( gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS );
const maxTextureSize = gl.getParameter( gl.MAX_TEXTURE_SIZE );
const maxCubemapSize = gl.getParameter( gl.MAX_CUBE_MAP_TEXTURE_SIZE );
const maxAttributes = gl.getParameter( gl.MAX_VERTEX_ATTRIBS );
const maxVertexUniforms = gl.getParameter( gl.MAX_VERTEX_UNIFORM_VECTORS );
const maxVaryings = gl.getParameter( gl.MAX_VARYING_VECTORS );
const maxFragmentUniforms = gl.getParameter( gl.MAX_FRAGMENT_UNIFORM_VECTORS );
const vertexTextures = maxVertexTextures > 0;
const maxSamples = gl.getParameter( gl.MAX_SAMPLES );
return {
isWebGL2: true, // keeping this for backwards compatibility
getMaxAnisotropy: getMaxAnisotropy,
getMaxPrecision: getMaxPrecision,
textureFormatReadable: textureFormatReadable,
textureTypeReadable: textureTypeReadable,
precision: precision,
logarithmicDepthBuffer: logarithmicDepthBuffer,
reverseDepthBuffer: reverseDepthBuffer,
maxTextures: maxTextures,
maxVertexTextures: maxVertexTextures,
maxTextureSize: maxTextureSize,
maxCubemapSize: maxCubemapSize,
maxAttributes: maxAttributes,
maxVertexUniforms: maxVertexUniforms,
maxVaryings: maxVaryings,
maxFragmentUniforms: maxFragmentUniforms,
vertexTextures: vertexTextures,
maxSamples: maxSamples
};
}
export { WebGLCapabilities };