binding mappings

cocos/core/gfx/base/define.ts

@@ -89,6 +89,7 @@ export enum API {
     GLES3,
     METAL,
     VULKAN,
+    NVN,
     WEBGL,
     WEBGL2,
     WEBGPU,
@@ -953,19 +954,44 @@ export class Color {
     }
 }
 
+/**
+ * For non-vulkan backends, to maintain compatibility and maximize
+ * descriptor cache-locality, descriptor-set-based binding numbers need
+ * to be mapped to backend-specific bindings based on maximum limit
+ * of available descriptor slots in each set.
+ *
+ * The GFX layer assumes the binding numbers for each descriptor type inside each set
+ * are guaranteed to be consecutive, so the mapping procedure is reduced
+ * to a simple shifting operation. This data structure specifies the
+ * capacity for each descriptor type in each set.
+ *
+ * The `setIndices` field defines the binding ordering between different sets.
+ * The last set index is treated as the 'flexible set', whose capacity is dynamically
+ * assigned based on the total available descriptor slots on the runtime device.
+ */
 export class BindingMappingInfo {
     declare private _token: never; // to make sure all usages must be an instance of this exact class, not assembled from plain object
 
     constructor (
-        public bufferOffsets: number[] = [],
-        public samplerOffsets: number[] = [],
-        public flexibleSet: number = 0,
+        public maxBlockCounts: number[] = [0],
+        public maxSamplerTextureCounts: number[] = [0],
+        public maxSamplerCounts: number[] = [0],
+        public maxTextureCounts: number[] = [0],
+        public maxBufferCounts: number[] = [0],
+        public maxImageCounts: number[] = [0],
+        public maxSubpassInputCounts: number[] = [0],
+        public setIndices: number[] = [0],
     ) {}
 
     public copy (info: Readonly<BindingMappingInfo>) {
-        this.bufferOffsets = info.bufferOffsets.slice();
-        this.samplerOffsets = info.samplerOffsets.slice();
-        this.flexibleSet = info.flexibleSet;
+        this.maxBlockCounts = info.maxBlockCounts.slice();
+        this.maxSamplerTextureCounts = info.maxSamplerTextureCounts.slice();
+        this.maxSamplerCounts = info.maxSamplerCounts.slice();
+        this.maxTextureCounts = info.maxTextureCounts.slice();
+        this.maxBufferCounts = info.maxBufferCounts.slice();
+        this.maxImageCounts = info.maxImageCounts.slice();
+        this.maxSubpassInputCounts = info.maxSubpassInputCounts.slice();
+        this.setIndices = info.setIndices.slice();
         return this;
     }
 }
@@ -1712,7 +1738,7 @@ export class QueryPoolInfo {
 
     constructor (
         public type: QueryType = QueryType.OCCLUSION,
-        public maxQueryObjects: number = 65536,
+        public maxQueryObjects: number = 32767,
         public forceWait: boolean = true,
     ) {}
 

cocos/core/gfx/empty/empty-device.ts

@@ -67,8 +67,6 @@ export class EmptyDevice extends Device {
         this._gfxAPI = API.UNKNOWN;
 
         this._bindingMappingInfo = info.bindingMappingInfo;
-        if (!this._bindingMappingInfo.bufferOffsets.length) this._bindingMappingInfo.bufferOffsets.push(0);
-        if (!this._bindingMappingInfo.samplerOffsets.length) this._bindingMappingInfo.samplerOffsets.push(0);
 
         this._queue = this.createQueue(new QueueInfo(QueueType.GRAPHICS));
         this._cmdBuff = this.createCommandBuffer(new CommandBufferInfo(this._queue));

cocos/core/gfx/webgl/webgl-command-buffer.ts

@@ -64,7 +64,7 @@ export class WebGLCommandBuffer extends CommandBuffer {
         this._type = info.type;
         this._queue = info.queue;
 
-        const setCount = WebGLDeviceManager.instance.bindingMappingInfo.bufferOffsets.length;
+        const setCount = WebGLDeviceManager.instance.bindingMappings.blockOffsets.length;
         for (let i = 0; i < setCount; i++) {
             this._curGPUDescriptorSets.push(null!);
         }

cocos/core/gfx/webgl/webgl-commands.ts

@@ -1432,12 +1432,12 @@ export function WebGLCmdFuncCreateShader (device: WebGLDevice, gpuShader: IWebGL
     // texture unit index mapping optimization
     const glActiveSamplers: IWebGLGPUUniformSamplerTexture[] = [];
     const glActiveSamplerLocations: WebGLUniformLocation[] = [];
-    const { bindingMappingInfo } = device;
+    const { bindingMappings } = device;
     const { texUnitCacheMap } = device.stateCache;
 
     let flexibleSetBaseOffset = 0;
     for (let i = 0; i < gpuShader.blocks.length; ++i) {
-        if (gpuShader.blocks[i].set === bindingMappingInfo.flexibleSet) {
+        if (gpuShader.blocks[i].set === bindingMappings.flexibleSet) {
             flexibleSetBaseOffset++;
         }
     }
@@ -1451,8 +1451,8 @@ export function WebGLCmdFuncCreateShader (device: WebGLDevice, gpuShader: IWebGL
             glActiveSamplerLocations.push(glLoc);
         }
         if (texUnitCacheMap[sampler.name] === undefined) {
-            let binding = sampler.binding + bindingMappingInfo.samplerOffsets[sampler.set] + arrayOffset;
-            if (sampler.set === bindingMappingInfo.flexibleSet) { binding -= flexibleSetBaseOffset; }
+            let binding = sampler.binding + bindingMappings.samplerTextureOffsets[sampler.set] + arrayOffset;
+            if (sampler.set === bindingMappings.flexibleSet) { binding -= flexibleSetBaseOffset; }
             texUnitCacheMap[sampler.name] = binding % device.capabilities.maxTextureUnits;
             arrayOffset += sampler.count - 1;
         }

cocos/core/gfx/webgl/webgl-device.ts

@@ -64,6 +64,7 @@ import { TextureBarrier } from '../base/states/texture-barrier';
 import { debug } from '../../platform/debug';
 import { Swapchain } from '../base/swapchain';
 import { WebGLDeviceManager } from './webgl-define';
+import { IWebGLBindingMapping } from './webgl-gpu-objects';
 
 export class WebGLDevice extends Device {
     get gl () {
@@ -86,16 +87,38 @@ export class WebGLDevice extends Device {
         return this._swapchain!.nullTexCube;
     }
 
+    get bindingMappings () {
+        return this._bindingMappings!;
+    }
+
     private _swapchain: WebGLSwapchain | null = null;
     private _context: WebGLRenderingContext | null = null;
+    private _bindingMappings: IWebGLBindingMapping | null = null;
 
     public initialize (info: DeviceInfo): boolean {
         WebGLDeviceManager.setInstance(this);
         this._gfxAPI = API.WEBGL;
 
-        this._bindingMappingInfo = info.bindingMappingInfo;
-        if (!this._bindingMappingInfo.bufferOffsets.length) this._bindingMappingInfo.bufferOffsets.push(0);
-        if (!this._bindingMappingInfo.samplerOffsets.length) this._bindingMappingInfo.samplerOffsets.push(0);
+        const mapping = this._bindingMappingInfo = info.bindingMappingInfo;
+        const blockOffsets: number[] = [];
+        const samplerTextureOffsets: number[] = [];
+        for (let i = 0; i < mapping.setIndices.length; ++i) {
+            const curSet = mapping.setIndices[i];
+            const prevSet = i ? mapping.setIndices[i - 1] : curSet;
+            // accumulate the per set offset according to the specified capacity
+            blockOffsets[curSet] = i ? mapping.maxBlockCounts[prevSet] + blockOffsets[prevSet] : 0;
+            samplerTextureOffsets[curSet] = i ? mapping.maxSamplerTextureCounts[prevSet] + samplerTextureOffsets[prevSet] : 0;
+        }
+        for (let i = 0; i < mapping.setIndices.length; ++i) {
+            const curSet = mapping.setIndices[i];
+            // textures always come after UBOs
+            samplerTextureOffsets[curSet] -= mapping.maxBlockCounts[curSet];
+        }
+        this._bindingMappings = {
+            blockOffsets,
+            samplerTextureOffsets,
+            flexibleSet: mapping.setIndices[mapping.setIndices.length - 1],
+        };
 
         const gl = this._context = getContext(Device.canvas);
 

cocos/core/gfx/webgl/webgl-gpu-objects.ts

@@ -102,6 +102,12 @@ export interface IWebGLGPUUniformInfo {
     isDirty: boolean;
 }
 
+export interface IWebGLBindingMapping {
+    blockOffsets: number[];
+    samplerTextureOffsets: number[];
+    flexibleSet: number;
+}
+
 export interface IWebGLGPUBufferView {
     gpuBuffer: IWebGLGPUBuffer;
     offset: number;

cocos/core/gfx/webgl2/webgl2-command-buffer.ts

@@ -76,7 +76,7 @@ export class WebGL2CommandBuffer extends CommandBuffer {
         this._type = info.type;
         this._queue = info.queue;
 
-        const setCount = WebGL2DeviceManager.instance.bindingMappingInfo.bufferOffsets.length;
+        const setCount = WebGL2DeviceManager.instance.bindingMappings.blockOffsets.length;
         for (let i = 0; i < setCount; i++) {
             this._curGPUDescriptorSets.push(null!);
         }

cocos/core/gfx/webgl2/webgl2-commands.ts

@@ -1552,7 +1552,7 @@ export function WebGL2CmdFuncCreateShader (device: WebGL2Device, gpuShader: IWeb
                 // blockIdx = gl.getUniformBlockIndex(gpuShader.glProgram, blockName);
                 blockIdx = b;
                 blockSize = gl.getActiveUniformBlockParameter(gpuShader.glProgram, blockIdx, gl.UNIFORM_BLOCK_DATA_SIZE);
-                const glBinding = block.binding + (device.bindingMappingInfo.bufferOffsets[block.set] || 0);
+                const glBinding = block.binding + (device.bindingMappings.blockOffsets[block.set] || 0);
 
                 gl.uniformBlockBinding(gpuShader.glProgram, blockIdx, glBinding);
 
@@ -1603,7 +1603,7 @@ export function WebGL2CmdFuncCreateShader (device: WebGL2Device, gpuShader: IWeb
 
     let flexibleSetBaseOffset = 0;
     for (let i = 0; i < gpuShader.blocks.length; ++i) {
-        if (gpuShader.blocks[i].set === device.bindingMappingInfo.flexibleSet) {
+        if (gpuShader.blocks[i].set === device.bindingMappings.flexibleSet) {
             flexibleSetBaseOffset++;
         }
     }
@@ -1618,8 +1618,8 @@ export function WebGL2CmdFuncCreateShader (device: WebGL2Device, gpuShader: IWeb
             glActiveSamplerLocations.push(glLoc);
         }
         if (texUnitCacheMap[sampler.name] === undefined) {
-            let binding = sampler.binding + device.bindingMappingInfo.samplerOffsets[sampler.set] + arrayOffset;
-            if (sampler.set === device.bindingMappingInfo.flexibleSet) { binding -= flexibleSetBaseOffset; }
+            let binding = sampler.binding + device.bindingMappings.samplerTextureOffsets[sampler.set] + arrayOffset;
+            if (sampler.set === device.bindingMappings.flexibleSet) { binding -= flexibleSetBaseOffset; }
             texUnitCacheMap[sampler.name] = binding % device.capabilities.maxTextureUnits;
             arrayOffset += sampler.count - 1;
         }

cocos/core/gfx/webgl2/webgl2-device.ts

@@ -64,6 +64,7 @@ import { TextureBarrier } from '../base/states/texture-barrier';
 import { debug } from '../../platform/debug';
 import { Swapchain } from '../base/swapchain';
 import { WebGL2DeviceManager } from './webgl2-define';
+import { IWebGL2BindingMapping } from './webgl2-gpu-objects';
 
 export class WebGL2Device extends Device {
     get gl () {
@@ -86,16 +87,38 @@ export class WebGL2Device extends Device {
         return this._swapchain!.nullTexCube;
     }
 
+    get bindingMappings () {
+        return this._bindingMappings!;
+    }
+
     private _swapchain: WebGL2Swapchain | null = null;
     private _context: WebGL2RenderingContext | null = null;
+    private _bindingMappings: IWebGL2BindingMapping | null = null;
 
     public initialize (info: DeviceInfo): boolean {
         WebGL2DeviceManager.setInstance(this);
         this._gfxAPI = API.WEBGL2;
 
-        this._bindingMappingInfo = info.bindingMappingInfo;
-        if (!this._bindingMappingInfo.bufferOffsets.length) this._bindingMappingInfo.bufferOffsets.push(0);
-        if (!this._bindingMappingInfo.samplerOffsets.length) this._bindingMappingInfo.samplerOffsets.push(0);
+        const mapping = this._bindingMappingInfo = info.bindingMappingInfo;
+        const blockOffsets: number[] = [];
+        const samplerTextureOffsets: number[] = [];
+        for (let i = 0; i < mapping.setIndices.length; ++i) {
+            const curSet = mapping.setIndices[i];
+            const prevSet = i ? mapping.setIndices[i - 1] : curSet;
+            // accumulate the per set offset according to the specified capacity
+            blockOffsets[curSet] = i ? mapping.maxBlockCounts[prevSet] + blockOffsets[prevSet] : 0;
+            samplerTextureOffsets[curSet] = i ? mapping.maxSamplerTextureCounts[prevSet] + samplerTextureOffsets[prevSet] : 0;
+        }
+        for (let i = 0; i < mapping.setIndices.length; ++i) {
+            const curSet = mapping.setIndices[i];
+            // textures always come after UBOs
+            samplerTextureOffsets[curSet] -= mapping.maxBlockCounts[curSet];
+        }
+        this._bindingMappings = {
+            blockOffsets,
+            samplerTextureOffsets,
+            flexibleSet: mapping.setIndices[mapping.setIndices.length - 1],
+        };
 
         const gl = this._context = getContext(Device.canvas);
 

cocos/core/gfx/webgl2/webgl2-gpu-objects.ts

@@ -92,6 +92,12 @@ export class WebGL2IndirectDrawInfos {
     }
 }
 
+export interface IWebGL2BindingMapping {
+    blockOffsets: number[];
+    samplerTextureOffsets: number[];
+    flexibleSet: number;
+}
+
 export interface IWebGL2GPUUniformInfo {
     name: string;
     type: Type;

cocos/core/pipeline/define.ts

@@ -156,10 +156,16 @@ export enum SetIndex {
     LOCAL,
 }
 // parameters passed to GFX Device
-export const bindingMappingInfo = new BindingMappingInfo();
-bindingMappingInfo.bufferOffsets = [0, GLOBAL_UBO_COUNT + LOCAL_UBO_COUNT, GLOBAL_UBO_COUNT];
-bindingMappingInfo.samplerOffsets = [-GLOBAL_UBO_COUNT, GLOBAL_SAMPLER_COUNT + LOCAL_SAMPLER_COUNT, GLOBAL_SAMPLER_COUNT - LOCAL_UBO_COUNT];
-bindingMappingInfo.flexibleSet = 1;
+export const bindingMappingInfo = new BindingMappingInfo(
+    [GLOBAL_UBO_COUNT, 0, LOCAL_UBO_COUNT],         // Uniform Buffer Counts
+    [GLOBAL_SAMPLER_COUNT, 0, LOCAL_SAMPLER_COUNT], // Combined Sampler Texture Counts
+    [0, 0, 0],                                      // Sampler Counts
+    [0, 0, 0],                                      // Texture Counts
+    [0, 0, 0],                                      // Storage Buffer Counts
+    [0, 0, 0],                                      // Storage Image Counts
+    [0, 0, 0],                                      // Subpass Input Counts
+    [0, 2, 1],                                      // Set Order Indices
+);
 
 /**
  * @en The global uniform buffer object