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WebGPURenderer: Add support for BC4 and BC5 texture compression. #31737

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Merged
merged 1 commit into from
Aug 25, 2025
Merged

WebGPURenderer: Add support for BC4 and BC5 texture compression. #31737

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3 changes: 2 additions & 1 deletion examples/webgpu_loader_texture_ktx2.html
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Original file line number Diff line number Diff line change
Expand Up @@ -117,7 +117,8 @@
{ path: '2d_etc2.ktx2' },
{ path: '2d_bc1.ktx2' },
{ path: '2d_bc3.ktx2' },
// { path: '2d_bc5.ktx2' },
{ path: '2d_bc4.ktx2' },
{ path: '2d_bc5.ktx2' },
{ path: '2d_bc7.ktx2' },
]
},
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2 changes: 1 addition & 1 deletion src/renderers/webgl-fallback/utils/WebGLUtils.js
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Expand Up @@ -232,7 +232,7 @@ class WebGLUtils {

if ( extension !== null ) {

if ( p === RGBA_BPTC_Format ) return extension.COMPRESSED_RED_RGTC1_EXT;
if ( p === RED_RGTC1_Format ) return extension.COMPRESSED_RED_RGTC1_EXT;
if ( p === SIGNED_RED_RGTC1_Format ) return extension.COMPRESSED_SIGNED_RED_RGTC1_EXT;
if ( p === RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_RED_GREEN_RGTC2_EXT;
if ( p === SIGNED_RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT;
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18 changes: 17 additions & 1 deletion src/renderers/webgpu/utils/WebGPUTextureUtils.js
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Expand Up @@ -14,7 +14,7 @@ import {
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, UnsignedIntType, UnsignedShortType, UnsignedInt248Type, UnsignedInt5999Type,
NeverCompare, AlwaysCompare, LessCompare, LessEqualCompare, EqualCompare, GreaterEqualCompare, GreaterCompare, NotEqualCompare, IntType, RedIntegerFormat, RGIntegerFormat, RGBAIntegerFormat,
UnsignedInt101111Type, RGBA_BPTC_Format, RGB_ETC1_Format, RGB_S3TC_DXT1_Format
UnsignedInt101111Type, RGBA_BPTC_Format, RGB_ETC1_Format, RGB_S3TC_DXT1_Format, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format
} from '../../../constants.js';
import { CubeTexture } from '../../../textures/CubeTexture.js';
import { DepthTexture } from '../../../textures/DepthTexture.js';
Expand Down Expand Up @@ -1140,6 +1140,22 @@ export function getFormat( texture, device = null ) {
formatGPU = ( transfer === SRGBTransfer ) ? GPUTextureFormat.BC3RGBAUnormSRGB : GPUTextureFormat.BC3RGBAUnorm;
break;

case RED_RGTC1_Format:
formatGPU = GPUTextureFormat.BC4RUnorm;
break;

case SIGNED_RED_RGTC1_Format:
formatGPU = GPUTextureFormat.BC4RSnorm;
break;

case RED_GREEN_RGTC2_Format:
formatGPU = GPUTextureFormat.BC5RGUnorm;
break;

case SIGNED_RED_GREEN_RGTC2_Format:
formatGPU = GPUTextureFormat.BC5RGSnorm;
break;

case RGBA_BPTC_Format:
formatGPU = ( transfer === SRGBTransfer ) ? GPUTextureFormat.BC7RGBAUnormSRGB : GPUTextureFormat.BC7RGBAUnorm;
break;
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