Abdelrahman Said
544 lines
16 KiB
C
544 lines
16 KiB
C
// vim:fileencoding=utf-8:foldmethod=marker
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#include "../src/wapp/wapp.h"
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#include <_inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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wp_intern WpLogger _log = { .name = wpStr8LitRo("dag_man") };
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/* ---------------------------------------------------------------------------
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* Pool allocator (arena-backed, intrusive free list)
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* -------------------------------------------------------------------------*/
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typedef struct PrPoolFreeNode PrPoolFreeNode;
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struct PrPoolFreeNode {
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PrPoolFreeNode *next;
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};
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typedef struct {
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WpAllocator *allocator;
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PrPoolFreeNode *free_head;
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u64 slot_size;
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} PrPool;
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wp_intern void prPoolInit(PrPool *pool, WpAllocator *allocator, u64 slot_size) {
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pool->allocator = allocator;
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pool->free_head = NULL;
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pool->slot_size = slot_size;
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}
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wp_intern void *prPoolAlloc(PrPool *pool) {
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if (pool->free_head) {
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PrPoolFreeNode *node = pool->free_head;
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pool->free_head = node->next;
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return node;
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}
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return wpMemAllocatorAlloc(pool->allocator, pool->slot_size);
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}
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wp_intern void prPoolFree(PrPool *pool, void *slot) {
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if (!slot) { return; }
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PrPoolFreeNode *node = (PrPoolFreeNode *)slot;
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node->next = pool->free_head;
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pool->free_head = node;
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}
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/* ---------------------------------------------------------------------------
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* Shared types
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* -------------------------------------------------------------------------*/
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#define INVALID_NODE_INDEX (u64)-1
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#define INVALID_NODE_ID ((PrNodeId){ .index = INVALID_NODE_INDEX, .generation = INVALID_NODE_INDEX })
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typedef enum {
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PR_NODE_TYPE_NONE,
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PR_NODE_TYPE_READ,
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PR_NODE_TYPE_BLUR,
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PR_NODE_TYPE_GRADE,
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COUNT_NODE_TYPES
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} PrNodeType;
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typedef struct {
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u64 index;
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u64 generation;
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} PrNodeId;
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typedef PrNodeId *PrNodeIdArray;
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typedef struct {
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union {
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WpStr8 path;
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f32 blur;
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f32 gain;
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} params;
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PrNodeType type;
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u64 generation;
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u64 next_free;
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} PrNode;
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typedef PrNode *PrNodeArray;
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/* ---------------------------------------------------------------------------
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* Graph edge type
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* -------------------------------------------------------------------------*/
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typedef struct PrGraphEdge PrGraphEdge;
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struct PrGraphEdge {
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PrGraphEdge *next_forward;
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PrGraphEdge *next_backward;
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PrNodeId source;
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PrNodeId target;
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};
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typedef PrGraphEdge *PrGraphEdgeArray;
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/* ---------------------------------------------------------------------------
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* Graph node — compact adjacency head (two pointers, no dead fields)
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* -------------------------------------------------------------------------*/
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typedef struct PrGraphNode PrGraphNode;
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struct PrGraphNode {
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PrGraphEdge *next_forward;
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PrGraphEdge *next_backward;
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};
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typedef PrGraphNode *PrGraphNodeArray;
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/* ---------------------------------------------------------------------------
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* PrGraph — owns only topology (edges + adjacency heads)
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* -------------------------------------------------------------------------*/
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typedef struct {
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PrPool edge_pool;
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PrGraphNodeArray graph_nodes;
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u64 capacity;
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} PrGraph;
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/* ---------------------------------------------------------------------------
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* PrNodeManager — owns compositor node data + handle lifecycle + topology
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* -------------------------------------------------------------------------*/
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typedef struct {
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PrNodeArray nodes;
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PrGraph graph;
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u64 capacity;
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u64 max_count_ever;
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u64 count;
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u64 free_head;
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} PrNodeManager;
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/* ---------------------------------------------------------------------------
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* Function declarations (cross-referencing both types)
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* -------------------------------------------------------------------------*/
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wp_intern void prNodeManagerInit(PrNodeManager *mgr, WpAllocator *allocator, u64 capacity);
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wp_intern b8 prNodeManagerIsStaleNode(const PrNodeManager *mgr, PrNodeId id);
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wp_intern b8 prNodeManagerIsActiveNode(const PrNodeManager *mgr, PrNodeId id);
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wp_intern PrNodeId prNodeManagerGetNode(const PrNodeManager *mgr, u64 index);
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wp_intern PrNodeId prNodeManagerAddNode(PrNodeManager *mgr, PrNodeType type);
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wp_intern void prNodeManagerRemoveNode(PrNodeManager *mgr, PrNodeId id);
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wp_intern void prNodeManagerAddEdge(PrNodeManager *mgr, PrNodeId from, PrNodeId to);
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wp_intern void prGraphInit(PrGraph *graph, WpAllocator *allocator, u64 capacity);
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wp_intern void prGraphAddEdge(PrNodeManager *mgr, PrGraph *graph, u64 from_idx, u64 to_idx);
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wp_intern void prGraphRemoveEdges(PrGraph *graph, u64 idx);
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wp_intern PrNodeIdArray prGraphTopologicalSort(const PrNodeManager *mgr, const PrGraph *graph,
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const WpAllocator *allocator);
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wp_intern void prGraphDump(const PrNodeManager *mgr, const PrGraph *graph);
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/* ---------------------------------------------------------------------------
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* PrNodeManager implementation
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* -------------------------------------------------------------------------*/
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wp_intern void prNodeManagerInit(PrNodeManager *mgr, WpAllocator *allocator, u64 capacity) {
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mgr->nodes = wpArrayAllocCapacity(PrNode, allocator, capacity, WP_ARRAY_INIT_FILLED);
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mgr->free_head = 0;
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mgr->capacity = capacity;
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mgr->max_count_ever = 0;
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mgr->count = 0;
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if (!mgr->nodes) {
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mgr->capacity = 0;
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return;
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}
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memset(mgr->nodes, 0, capacity * sizeof(PrNode));
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for (u64 i = 0; i < capacity; ++i) {
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mgr->nodes[i].next_free = i < capacity - 1 ? i + 1 : INVALID_NODE_INDEX;
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}
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prGraphInit(&mgr->graph, allocator, capacity);
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}
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wp_intern b8 prNodeManagerIsStaleNode(const PrNodeManager *mgr, PrNodeId id) {
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u64 generation = mgr->nodes[id.index].generation;
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return id.generation != generation;
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}
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wp_intern b8 prNodeManagerIsActiveNode(const PrNodeManager *mgr, PrNodeId id) {
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u64 next_free = mgr->nodes[id.index].next_free;
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return !prNodeManagerIsStaleNode(mgr, id) && next_free == INVALID_NODE_INDEX;
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}
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wp_intern PrNodeId prNodeManagerGetNode(const PrNodeManager *mgr, u64 index) {
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return (PrNodeId){ .index = index, .generation = mgr->nodes[index].generation };
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}
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wp_intern PrNodeId prNodeManagerAddNode(PrNodeManager *mgr, PrNodeType type) {
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u64 idx = mgr->free_head;
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if (idx == INVALID_NODE_INDEX) { return INVALID_NODE_ID; }
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PrNode *node = &mgr->nodes[idx];
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mgr->free_head = node->next_free;
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node->next_free = INVALID_NODE_INDEX;
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node->type = type;
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memset(&node->params, 0, sizeof(node->params));
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mgr->count++;
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if (idx + 1 > mgr->max_count_ever) { mgr->max_count_ever = idx + 1; }
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return (PrNodeId){ .index = idx, .generation = node->generation };
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}
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wp_intern void prNodeManagerRemoveNode(PrNodeManager *mgr, PrNodeId id) {
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if (!prNodeManagerIsActiveNode(mgr, id)) { return; }
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/* Tear down all edges incident to this node */
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prGraphRemoveEdges(&mgr->graph, id.index);
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/* Return node slot to free list with bumped generation */
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PrNode *node = &mgr->nodes[id.index];
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node->generation++;
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node->next_free = mgr->free_head;
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mgr->free_head = id.index;
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mgr->count--;
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}
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wp_intern void prNodeManagerAddEdge(PrNodeManager *mgr, PrNodeId from, PrNodeId to) {
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if (!prNodeManagerIsActiveNode(mgr, from) || !prNodeManagerIsActiveNode(mgr, to)) { return; }
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if (from.index == to.index) { return; }
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prGraphAddEdge(mgr, &mgr->graph, from.index, to.index);
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}
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/* ---------------------------------------------------------------------------
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* PrGraph implementation
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* -------------------------------------------------------------------------*/
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wp_intern void prGraphInit(PrGraph *graph, WpAllocator *allocator, u64 capacity) {
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graph->graph_nodes = wpArrayAllocCapacity(PrGraphNode, allocator, capacity, WP_ARRAY_INIT_FILLED);
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graph->capacity = capacity;
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if (!graph->graph_nodes) {
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graph->capacity = 0;
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return;
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}
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prPoolInit(&graph->edge_pool, allocator, sizeof(PrGraphEdge));
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memset(graph->graph_nodes, 0, capacity * sizeof(PrGraphNode));
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}
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/* --- internal: unlink edge helpers (raw indices, caller guarantees validity) -- */
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wp_intern void _unlinkForward(PrGraph *graph, u64 from_idx, PrGraphEdge *edge) {
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PrGraphNode *gnode = &graph->graph_nodes[from_idx];
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PrGraphEdge *curr = gnode->next_forward;
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PrGraphEdge *prev = NULL;
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while (curr) {
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if (curr == edge) {
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if (prev) {
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prev->next_forward = curr->next_forward;
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} else {
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gnode->next_forward = curr->next_forward;
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}
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return;
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}
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prev = curr;
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curr = curr->next_forward;
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}
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}
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wp_intern void _unlinkBackward(PrGraph *graph, u64 to_idx, PrGraphEdge *edge) {
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PrGraphNode *gnode = &graph->graph_nodes[to_idx];
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PrGraphEdge *curr = gnode->next_backward;
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PrGraphEdge *prev = NULL;
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while (curr) {
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if (curr == edge) {
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if (prev) {
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prev->next_backward = curr->next_backward;
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} else {
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gnode->next_backward = curr->next_backward;
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}
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return;
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}
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prev = curr;
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curr = curr->next_backward;
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}
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}
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/* --- edge management -------------------------------------------------- */
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wp_intern void prGraphAddEdge(PrNodeManager *mgr, PrGraph *graph, u64 from_idx, u64 to_idx) {
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PrGraphEdge *edge = (PrGraphEdge *)prPoolAlloc(&graph->edge_pool);
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if (!edge) { return; }
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PrNodeId from_id = prNodeManagerGetNode(mgr, from_idx);
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PrNodeId to_id = prNodeManagerGetNode(mgr, to_idx);
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edge->source = from_id;
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edge->target = to_id;
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/* Link into adjacency chains */
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PrGraphNode *src = &graph->graph_nodes[from_idx];
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PrGraphNode *dst = &graph->graph_nodes[to_idx];
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edge->next_forward = src->next_forward;
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edge->next_backward = dst->next_backward;
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src->next_forward = edge;
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dst->next_backward = edge;
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/* Check whether the new edge created a cycle */
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WpAllocator scratch = wpMemArenaAllocatorInitZero(KiB(16));
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PrNodeIdArray sorted = prGraphTopologicalSort(mgr, graph, &scratch);
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u64 sorted_cnt = sorted ? wpArrayCount(sorted) : 0;
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if (sorted_cnt < mgr->count) {
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_unlinkForward(graph, from_idx, edge);
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_unlinkBackward(graph, to_idx, edge);
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prPoolFree(&graph->edge_pool, edge);
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}
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}
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wp_intern void prGraphRemoveEdges(PrGraph *graph, u64 idx) {
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PrGraphNode *gnode = &graph->graph_nodes[idx];
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/* Free outgoing edges: unlink from each target's backward list */
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PrGraphEdge *curr = gnode->next_forward;
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while (curr) {
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PrGraphEdge *next = curr->next_forward;
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_unlinkBackward(graph, curr->target.index, curr);
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prPoolFree(&graph->edge_pool, curr);
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curr = next;
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}
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/* Free incoming edges: unlink from each source's forward list */
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curr = gnode->next_backward;
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while (curr) {
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PrGraphEdge *next = curr->next_backward;
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_unlinkForward(graph, curr->source.index, curr);
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prPoolFree(&graph->edge_pool, curr);
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curr = next;
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}
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gnode->next_forward = gnode->next_backward = NULL;
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}
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/* ---------------------------------------------------------------------------
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* Kahn's algorithm — topological sort / cycle detection
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*
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* Returns a WpArray of PrNodeId (sorted topologically). If the result count
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* is less than mgr->count, the graph contains a cycle.
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* -------------------------------------------------------------------------*/
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wp_intern PrNodeIdArray prGraphTopologicalSort(const PrNodeManager *mgr, const PrGraph *graph,
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const WpAllocator *allocator) {
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if (mgr->count == 0) { return NULL; }
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if (!mgr->nodes || graph->capacity == 0) { return NULL; }
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PrNodeIdArray result = wpArrayAllocCapacity(PrNodeId, allocator, mgr->count, WP_ARRAY_INIT_NONE);
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if (!result) { return NULL; }
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WpAllocator local_arena = wpMemArenaAllocatorInitZero(KiB(16));
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WpU64Array in_degree = wpArrayAllocCapacity(u64, &local_arena, graph->capacity, WP_ARRAY_INIT_FILLED);
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if (!in_degree) { return result; }
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memset(in_degree, 0, wpArrayCapacity(in_degree) * sizeof(u64));
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for (u64 i = 0; i < mgr->max_count_ever; i++) {
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PrNodeId id = prNodeManagerGetNode(mgr, i);
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if (!prNodeManagerIsActiveNode(mgr, id)) { continue; }
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PrGraphNode *gnode = &graph->graph_nodes[i];
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PrGraphEdge *curr = gnode->next_forward;
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while (curr) {
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in_degree[curr->target.index]++;
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curr = curr->next_forward;
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}
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}
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WpQueue queue = wpQueueAlloc(u64, &local_arena, mgr->count);
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for (u64 i = 0; i < mgr->max_count_ever; i++) {
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PrNodeId id = prNodeManagerGetNode(mgr, i);
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if (!prNodeManagerIsActiveNode(mgr, id)) { continue; }
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if (in_degree[i] == 0) {
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wpQueuePush(u64, &queue, &i);
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}
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}
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while (queue.count > 0) {
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u64 *node_idx = wpQueuePop(u64, &queue);
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if (!node_idx) { break; }
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PrNodeId id = prNodeManagerGetNode(mgr, *node_idx);
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wpArrayAppendCapped(PrNodeId, result, &id);
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PrGraphNode *gnode = &graph->graph_nodes[*node_idx];
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PrGraphEdge *curr = gnode->next_forward;
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while (curr) {
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u64 target_idx = curr->target.index;
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if (in_degree[target_idx] > 0) {
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in_degree[target_idx]--;
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if (in_degree[target_idx] == 0) {
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wpQueuePush(u64, &queue, &target_idx);
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}
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}
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curr = curr->next_forward;
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}
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}
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return result;
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}
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/* ---------------------------------------------------------------------------
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* Dump
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* -------------------------------------------------------------------------*/
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wp_intern void prGraphDump(const PrNodeManager *mgr, const PrGraph *graph) {
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printf("==============INPUTS==============\n");
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for (u64 i = 0; i < mgr->max_count_ever; ++i) {
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PrNodeId id = prNodeManagerGetNode(mgr, i);
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if (!prNodeManagerIsActiveNode(mgr, id)) { continue; }
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PrGraphNode *gnode = &graph->graph_nodes[i];
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printf("%" PRIu64 ":", id.index + 1);
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if (!(gnode->next_backward)) {
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printf(" (none)");
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} else {
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PrGraphEdge *curr = gnode->next_backward;
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while (curr) {
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printf(" %" PRIu64, curr->source.index + 1);
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curr = curr->next_backward;
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}
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}
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printf("\n");
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}
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printf("==============OUTPUTS==============\n");
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for (u64 i = 0; i < mgr->max_count_ever; ++i) {
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PrNodeId id = prNodeManagerGetNode(mgr, i);
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if (!prNodeManagerIsActiveNode(mgr, id)) { continue; }
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PrGraphNode *gnode = &graph->graph_nodes[i];
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printf("%" PRIu64 ":", id.index + 1);
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if (!(gnode->next_forward)) {
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printf(" (none)");
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} else {
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PrGraphEdge *curr = gnode->next_forward;
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while (curr) {
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printf(" %" PRIu64, curr->target.index + 1);
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curr = curr->next_forward;
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}
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}
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printf("\n");
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}
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}
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/* ---------------------------------------------------------------------------
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* Main
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* -------------------------------------------------------------------------*/
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i32 main(void) {
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WpAllocator arena = wpMemArenaAllocatorInitZero(MiB(16));
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if (wpMemAllocatorInvalid(&arena)) {
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wpLogFatal(&_log, wpStr8Lit("arena init failed"));
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return 1;
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}
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PrNodeManager mgr = {0};
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prNodeManagerInit(&mgr, &arena, 128);
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PrNodeId n1 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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PrNodeId n2 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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PrNodeId n3 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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PrNodeId n4 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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PrNodeId n5 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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prNodeManagerAddEdge(&mgr, n1, n2);
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prNodeManagerAddEdge(&mgr, n1, n3);
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prNodeManagerAddEdge(&mgr, n1, n5);
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prNodeManagerAddEdge(&mgr, n2, n4);
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prNodeManagerAddEdge(&mgr, n3, n4);
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prNodeManagerAddEdge(&mgr, n3, n5);
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prGraphDump(&mgr, &mgr.graph);
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prNodeManagerRemoveNode(&mgr, n3);
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printf("\n");
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prGraphDump(&mgr, &mgr.graph);
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PrNodeId n6 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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prNodeManagerAddEdge(&mgr, n4, n6);
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printf("\n");
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prGraphDump(&mgr, &mgr.graph);
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prNodeManagerRemoveNode(&mgr, n5);
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printf("\n");
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prGraphDump(&mgr, &mgr.graph);
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PrNodeId n7 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
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prNodeManagerAddEdge(&mgr, n1, n7);
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prNodeManagerAddEdge(&mgr, n2, n7);
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printf("\n");
|
|
prGraphDump(&mgr, &mgr.graph);
|
|
|
|
PrNodeId n8 = prNodeManagerAddNode(&mgr, PR_NODE_TYPE_READ);
|
|
|
|
prNodeManagerAddEdge(&mgr, n6, n8);
|
|
prNodeManagerAddEdge(&mgr, n7, n8);
|
|
|
|
printf("\n");
|
|
prGraphDump(&mgr, &mgr.graph);
|
|
|
|
printf("\n=== Try adding cycle 8→1 (should be rejected) ===\n");
|
|
prNodeManagerAddEdge(&mgr, n8, n1);
|
|
|
|
printf("\n=== Try adding 8→1 again (still rejected) ===\n");
|
|
prNodeManagerAddEdge(&mgr, n8, n1);
|
|
|
|
printf("\n=== Try adding cycle 7→2 (should be rejected) ===\n\n");
|
|
prNodeManagerAddEdge(&mgr, n7, n2);
|
|
|
|
prGraphDump(&mgr, &mgr.graph);
|
|
|
|
printf("\n=== Topological sort ===\n");
|
|
PrNodeId *sorted = prGraphTopologicalSort(&mgr, &mgr.graph, &arena);
|
|
if (sorted) {
|
|
u64 n = wpArrayCount(sorted);
|
|
printf(" count: %llu / %llu active\n",
|
|
(unsigned long long)n,
|
|
(unsigned long long)mgr.count);
|
|
for (u64 i = 0; i < n; i++) {
|
|
printf(" [%llu] idx=%llu gen=%llu\n",
|
|
(unsigned long long)i,
|
|
(unsigned long long)sorted[i].index,
|
|
(unsigned long long)sorted[i].generation);
|
|
}
|
|
}
|
|
|
|
wpMemArenaAllocatorDestroy(&arena);
|
|
|
|
return 0;
|
|
}
|