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+import { AlphaFormat, LuminanceFormat, LuminanceAlphaFormat, RedFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBFormat, RGBAFormat, RGBAIntegerFormat, RGB_S3TC_DXT1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGB_PVRTC_2BPPV1_Format, RGBA_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_BPTC_Format, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, UnsignedByteType, ByteType, UnsignedShortType, ShortType, HalfFloatType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedIntType, IntType, FloatType, UnsignedInt5999Type } from '../constants.js';
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+
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+/**
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+ * Given the width, height, format, and type of a texture. Determines how many
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+ * bytes must be used to represent the texture.
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+ */
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+function getByteLength( width, height, format, type ) {
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+
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+ const typeByteLength = getTextureTypeByteLength( type );
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+
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+ switch ( format ) {
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+
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+ // https://registry.khronos.org/OpenGL-Refpages/es3.0/html/glTexImage2D.xhtml
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+ case AlphaFormat:
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+ return width * height;
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+ case LuminanceFormat:
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+ return width * height;
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+ case LuminanceAlphaFormat:
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+ return width * height * 2;
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+ case RedFormat:
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+ return ( ( width * height ) / typeByteLength.components ) * typeByteLength.byteLength;
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+ case RedIntegerFormat:
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+ return ( ( width * height ) / typeByteLength.components ) * typeByteLength.byteLength;
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+ case RGFormat:
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+ return ( ( width * height * 2 ) / typeByteLength.components ) * typeByteLength.byteLength;
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+ case RGIntegerFormat:
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+ return ( ( width * height * 2 ) / typeByteLength.components ) * typeByteLength.byteLength;
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+ case RGBFormat:
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+ return ( ( width * height * 3 ) / typeByteLength.components ) * typeByteLength.byteLength;
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+ case RGBAFormat:
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+ return ( ( width * height * 4 ) / typeByteLength.components ) * typeByteLength.byteLength;
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+ case RGBAIntegerFormat:
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+ return ( ( width * height * 4 ) / typeByteLength.components ) * typeByteLength.byteLength;
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+
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+ // https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_s3tc_srgb/
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+ case RGB_S3TC_DXT1_Format:
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+ case RGBA_S3TC_DXT1_Format:
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+ return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 8;
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+ case RGBA_S3TC_DXT3_Format:
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+ case RGBA_S3TC_DXT5_Format:
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+ return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
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+
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+ // https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_pvrtc/
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+ case RGB_PVRTC_2BPPV1_Format:
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+ case RGBA_PVRTC_2BPPV1_Format:
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+ return ( Math.max( width, 16 ) * Math.max( height, 8 ) ) / 4;
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+ case RGB_PVRTC_4BPPV1_Format:
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+ case RGBA_PVRTC_4BPPV1_Format:
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+ return ( Math.max( width, 8 ) * Math.max( height, 8 ) ) / 2;
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+
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+ // https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_etc/
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+ case RGB_ETC1_Format:
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+ case RGB_ETC2_Format:
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+ return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 8;
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+ case RGBA_ETC2_EAC_Format:
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+ return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
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+
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+ // https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_astc/
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+ case RGBA_ASTC_4x4_Format:
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+ return Math.floor( ( width + 3 ) / 4 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
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+ case RGBA_ASTC_5x4_Format:
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+ return Math.floor( ( width + 4 ) / 5 ) * Math.floor( ( height + 3 ) / 4 ) * 16;
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+ case RGBA_ASTC_5x5_Format:
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+ return Math.floor( ( width + 4 ) / 5 ) * Math.floor( ( height + 4 ) / 5 ) * 16;
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+ case RGBA_ASTC_6x5_Format:
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+ return Math.floor( ( width + 5 ) / 6 ) * Math.floor( ( height + 4 ) / 5 ) * 16;
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+ case RGBA_ASTC_6x6_Format:
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+ return Math.floor( ( width + 5 ) / 6 ) * Math.floor( ( height + 5 ) / 6 ) * 16;
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+ case RGBA_ASTC_8x5_Format:
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+ return Math.floor( ( width + 7 ) / 8 ) * Math.floor( ( height + 4 ) / 5 ) * 16;
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+ case RGBA_ASTC_8x6_Format:
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+ return Math.floor( ( width + 7 ) / 8 ) * Math.floor( ( height + 5 ) / 6 ) * 16;
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+ case RGBA_ASTC_8x8_Format:
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+ return Math.floor( ( width + 7 ) / 8 ) * Math.floor( ( height + 7 ) / 8 ) * 16;
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+ case RGBA_ASTC_10x5_Format:
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+ return Math.floor( ( width + 9 ) / 10 ) * Math.floor( ( height + 4 ) / 5 ) * 16;
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+ case RGBA_ASTC_10x6_Format:
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+ return Math.floor( ( width + 9 ) / 10 ) * Math.floor( ( height + 5 ) / 6 ) * 16;
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+ case RGBA_ASTC_10x8_Format:
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+ return Math.floor( ( width + 9 ) / 10 ) * Math.floor( ( height + 7 ) / 8 ) * 16;
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+ case RGBA_ASTC_10x10_Format:
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+ return Math.floor( ( width + 9 ) / 10 ) * Math.floor( ( height + 9 ) / 10 ) * 16;
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+ case RGBA_ASTC_12x10_Format:
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+ return Math.floor( ( width + 11 ) / 12 ) * Math.floor( ( height + 9 ) / 10 ) * 16;
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+ case RGBA_ASTC_12x12_Format:
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+ return Math.floor( ( width + 11 ) / 12 ) * Math.floor( ( height + 11 ) / 12 ) * 16;
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+
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+ // https://registry.khronos.org/webgl/extensions/EXT_texture_compression_bptc/
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+ case RGBA_BPTC_Format:
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+ case RGB_BPTC_SIGNED_Format:
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+ case RGB_BPTC_UNSIGNED_Format:
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+ return Math.ceil( width / 4 ) * Math.ceil( height / 4 ) * 16;
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+
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+ // https://registry.khronos.org/webgl/extensions/EXT_texture_compression_rgtc/
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+ case RED_RGTC1_Format:
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+ case SIGNED_RED_RGTC1_Format:
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+ return Math.ceil( width / 4 ) * Math.ceil( height / 4 ) * 8;
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+ case RED_GREEN_RGTC2_Format:
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+ case SIGNED_RED_GREEN_RGTC2_Format:
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+ return Math.ceil( width / 4 ) * Math.ceil( height / 4 ) * 16;
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+
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+ }
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+
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+ throw new Error(
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+ `Unable to determine texture byte length for ${format} format.`,
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+ );
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+
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+}
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+
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+function getTextureTypeByteLength( type ) {
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+
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+ switch ( type ) {
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+
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+ case UnsignedByteType:
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+ case ByteType:
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+ return { byteLength: 1, components: 1 };
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+ case UnsignedShortType:
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+ case ShortType:
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+ case HalfFloatType:
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+ return { byteLength: 2, components: 1 };
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+ case UnsignedShort4444Type:
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+ case UnsignedShort5551Type:
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+ return { byteLength: 2, components: 4 };
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+ case UnsignedIntType:
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+ case IntType:
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+ case FloatType:
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+ return { byteLength: 4, components: 1 };
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+ case UnsignedInt5999Type:
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+ return { byteLength: 4, components: 3 };
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+
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+ }
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+
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+ throw new Error( `Unknown texture type ${type}.` );
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+
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+}
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+
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+const TextureUtils = {
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+ getByteLength,
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+};
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+
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+export { getByteLength, TextureUtils };
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Hunter Larco
