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Test using RGBA8 instead of R32U for order texture upload #8496

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Test using RGBA8 instead of R32U for order texture upload #8496

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bdd9fe0
Test using RGBA8 instead of R32U for order texture upload
Mar 3, 2026
eaa365c
Merge branch 'main' into mv-test-orderbuffer-rgba8
Mar 4, 2026
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4 changes: 2 additions & 2 deletions src/scene/gsplat-unified/gsplat-work-buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ import { Frustum } from '../../core/shape/frustum.js';
import { Mat4 } from '../../core/math/mat4.js';
import { Vec2 } from '../../core/math/vec2.js';
import {
ADDRESS_CLAMP_TO_EDGE, PIXELFORMAT_R32U, PIXELFORMAT_RGBA16U, PIXELFORMAT_RGBA32F,
ADDRESS_CLAMP_TO_EDGE, PIXELFORMAT_R32U, PIXELFORMAT_RGBA8, PIXELFORMAT_RGBA16U, PIXELFORMAT_RGBA32F,
BUFFERUSAGE_COPY_DST, SEMANTIC_POSITION, getGlslShaderType
} from '../../platform/graphics/constants.js';
import { RenderTarget } from '../../platform/graphics/render-target.js';
Expand Down Expand Up @@ -262,7 +262,7 @@ class GSplatWorkBuffer {
name: 'SplatGlobalOrder',
width: 1,
height: 1,
format: PIXELFORMAT_R32U,
format: PIXELFORMAT_RGBA8,
mipmaps: false,
addressU: ADDRESS_CLAMP_TO_EDGE,
addressV: ADDRESS_CLAMP_TO_EDGE
Expand Down
10 changes: 7 additions & 3 deletions src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatSource.js
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Expand Up @@ -3,7 +3,7 @@ attribute vec3 vertex_position; // xy: cornerUV, z: render order offset
attribute uint vertex_id_attrib; // render order base

uniform uint numSplats; // total number of splats
uniform highp usampler2D splatOrder; // per-splat index to source gaussian
uniform highp sampler2D splatOrder; // per-splat index to source gaussian (RGBA8)

// initialize the splat source structure and global splat
bool initSource(out SplatSource source) {
Expand All @@ -17,8 +17,12 @@ bool initSource(out SplatSource source) {

ivec2 orderUV = ivec2(source.order % splatTextureSize, source.order / splatTextureSize);

// read splat id and initialize global splat for format read functions
uint splatId = texelFetch(splatOrder, orderUV, 0).r;
// read splat id: decode uint from RGBA8 normalized texel
vec4 orderBytes = texelFetch(splatOrder, orderUV, 0);
uint splatId = uint(orderBytes.r * 255.0 + 0.5) |
(uint(orderBytes.g * 255.0 + 0.5) << 8u) |
(uint(orderBytes.b * 255.0 + 0.5) << 16u) |
(uint(orderBytes.a * 255.0 + 0.5) << 24u);
setSplat(splatId);

// get the corner
Expand Down