egutierrez
427262b892
Issue 0049c. Tres optimizaciones internas en graph_renderer.cpp + un
helper puro en graph_force_layout para detectar convergencia. API publica
intacta — solo cambian el layout interno de los buffers, el shader y
los costes por frame.
1. RGBA8 color packing
- El instance buffer de nodos pasa de (x,y,size,r,g,b,a) 28B a
(x,y,size,color_u32) 16B (-43%). Aristas: 24B → 12B/vertex (-50%).
- Shaders desempaquetan con bit shifts (compatible GL 3.30+, no
necesita unpackUnorm4x8 que es 4.20+).
- Helpers expuestos: pack_rgba8 / unpack_rgba8 / modulate_alpha_rgba8
en graph_renderer.h. Los GraphNode.color y la paleta ya tenian el
layout correcto (R en LSB), asi que CPU ahora pasa el uint32 directo
sin convertir a 4 floats por nodo y por frame.
2. Capacity-tracked streaming buffers
- Sustituye el doble glBufferData de antes por:
glBufferData(NULL, capacity, STREAM_DRAW) // orphan + reserva
glBufferSubData(0, used_bytes, data) // solo lo usado
- capacity crece x2 cuando hace falta (inicial 4096 nodos /
8192 vertices de aristas) → reallocaciones en O(log N).
- Staging CPU (NodeInstance* / EdgeVertex*) reusado entre frames con
realloc, no malloc/free per frame.
3. Frustum cull (CPU-side)
- AABB del viewport en world coords con margen 10%.
- Aristas: skip si AABB del segmento no intersecta el viewport.
- Nodos: solo los visibles entran al instance buffer; visible_count
es el N que pasa a glDrawArraysInstanced. Pop-in de borde mitigado
por el margen.
4. graph_force_layout_should_pause(low_frames, min_consecutive)
- Helper puro: el caller mantiene el contador, la funcion solo
decide si parar. Reemplaza la rama inline en demos_graph.cpp.
- Test Catch2 con secuencias artificiales.
Tests: test_graph_pack_rgba8 (16401 asserts, 4 cases — roundtrip exhaustivo
+ alpha modulation + clamp). test_graph_should_pause (3 cases, 14 asserts).
Los 29 tests del cpp/tests/ siguen verdes (incluido test_visual con goldens).
Bump versiones:
- graph_renderer 1.1.0 → 1.2.0
- graph_force_layout 1.0.0 → 1.1.0 (tested: true via should_pause test)
59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
#pragma once
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#include <cstdint>
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struct GraphData; // forward declare
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struct GraphRendererConfig {
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float node_outline = 1.5f; // outline width in pixels
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float edge_width = 1.0f; // edge line width
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float edge_alpha = 0.4f; // edge transparency
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uint32_t bg_color = 0xFF1A1A1E; // ABGR background
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bool edge_fade_alpha = true; // fade edge alpha by distance to camera
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// Default palette for communities (when node.color == 0)
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// 10 distinct colors, ABGR packed
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};
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struct GraphRenderer;
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// Lifecycle
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GraphRenderer* graph_renderer_create(int width, int height, const GraphRendererConfig& config = {});
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void graph_renderer_destroy(GraphRenderer* r);
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void graph_renderer_resize(GraphRenderer* r, int width, int height);
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// Render graph to internal FBO.
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// cam_x, cam_y: camera center in graph space
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// cam_zoom: zoom level (1.0 = 1:1 pixel mapping)
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// Returns OpenGL texture ID suitable for ImGui::Image().
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unsigned int graph_renderer_draw(GraphRenderer* r, const GraphData& graph,
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float cam_x, float cam_y, float cam_zoom);
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// ---------------------------------------------------------------------------
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// RGBA8 packing helpers
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// ---------------------------------------------------------------------------
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// Layout: byte 0 (LSB) = R, byte 1 = G, byte 2 = B, byte 3 (MSB) = A.
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// On a little-endian host this matches GLSL's `unpackUnorm4x8(uint)` which
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// returns vec4(byte0, byte1, byte2, byte3) / 255 — so the GPU reads it as
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// (R, G, B, A) without any swizzle.
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inline uint32_t pack_rgba8(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
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return (uint32_t)r
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| ((uint32_t)g << 8)
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| ((uint32_t)b << 16)
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| ((uint32_t)a << 24);
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}
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inline void unpack_rgba8(uint32_t c, uint8_t& r, uint8_t& g, uint8_t& b, uint8_t& a) {
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r = (uint8_t)( c & 0xFF);
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g = (uint8_t)((c >> 8 ) & 0xFF);
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b = (uint8_t)((c >> 16) & 0xFF);
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a = (uint8_t)((c >> 24) & 0xFF);
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}
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// Multiply alpha channel by a [0..1] scale, clamping to 255.
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inline uint32_t modulate_alpha_rgba8(uint32_t c, float scale) {
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uint32_t a = (c >> 24) & 0xFFu;
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float af = (float)a * scale + 0.5f;
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if (af < 0.0f) af = 0.0f;
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if (af > 255.0f) af = 255.0f;
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return (c & 0x00FFFFFFu) | ((uint32_t)af << 24);
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}
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