86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
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/*
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Crafter®.Graphics
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Copyright (C) 2026 Catcrafts®
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catcrafts.net
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*/
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// Backend-agnostic UIRenderer methods. FillHeader and ShapeText do not
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// touch any GPU API; they only read window dimensions and (for ShapeText)
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// the CPU-side font atlas. Split out so both Vulkan and WebGPU impls
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// share the same source.
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module Crafter.Graphics:UI_shared_impl;
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import :UI;
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import :Window;
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import :Font;
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import :FontAtlas;
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import :GraphicsTypes;
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import std;
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using namespace Crafter;
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UIDispatchHeader UIRenderer::FillHeader(std::uint32_t itemBufferSlot,
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std::uint32_t itemCount,
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std::array<float,4> clipRectPx,
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std::uint32_t flags) const noexcept {
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UIDispatchHeader h{};
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h.outImage = outImageSlot_;
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h.itemBuffer = itemBufferSlot;
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h.surfaceWidth = window_->width;
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h.surfaceHeight = window_->height;
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h.clipX = clipRectPx[0];
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h.clipY = clipRectPx[1];
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h.clipW = clipRectPx[2];
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h.clipH = clipRectPx[3];
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h.itemCount = itemCount;
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#ifndef CRAFTER_GRAPHICS_WINDOW_DOM
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h.frameIdx = window_->currentBuffer;
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#else
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h.frameIdx = 0;
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#endif
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h.flags = flags;
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h._pad = 0;
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return h;
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}
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std::uint32_t UIRenderer::ShapeText(Font& font, float pxSize,
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float x, float baselineY,
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std::string_view utf8,
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std::array<float,4> color,
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GlyphItem* out, std::uint32_t outCapacity,
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float* outAdvance) {
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if (fontAtlas == nullptr) {
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std::println("UIRenderer::ShapeText: no FontAtlas (set fontAtlas before Initialize)");
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std::abort();
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}
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const float scale = pxSize / FontAtlas::kBaseSize;
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float cursor = x;
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std::uint32_t written = 0;
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std::size_t i = 0;
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while (i < utf8.size() && written < outCapacity) {
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std::uint32_t cp = DecodeUtf8(utf8, i);
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if (cp == 0) break;
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if (cp == '\n') { continue; }
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fontAtlas->Ensure(font, cp);
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const Glyph* g = fontAtlas->Lookup(font, cp);
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if (g == nullptr) continue;
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if (g->w > 0 && g->h > 0) {
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GlyphItem& gi = out[written++];
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gi.x = cursor + g->xoff * scale;
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gi.y = baselineY + g->yoff * scale;
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gi.w = g->w * scale;
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gi.h = g->h * scale;
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gi.u0 = g->u0; gi.v0 = g->v0;
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gi.u1 = g->u1; gi.v1 = g->v1;
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gi.r = color[0]; gi.g = color[1]; gi.b = color[2]; gi.a = color[3];
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}
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cursor += g->advance * scale;
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}
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if (outAdvance) *outAdvance = cursor - x;
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return written;
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}
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