f3e21c6b98
Accumulated uncommitted work: GHOST Web backend, WebGL/GPU web layer, web workflow engine and protocol, tooling, docs and task records. Large generated evidence, user-testing archives, build snapshots and imported test assets remain untracked. Co-Authored-By: Claude Code <noreply@anthropic.com>
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
/* SPDX-FileCopyrightText: 2026 Blender Authors
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "GHOST_ContextWeb.hh"
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#include <GLES2/gl2.h>
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#include <emscripten.h>
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GHOST_ContextWeb::GHOST_ContextWeb(const GHOST_ContextParams ¶ms, const char *selector)
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: GHOST_Context(params), selector_(selector)
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{
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}
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GHOST_ContextWeb::~GHOST_ContextWeb()
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{
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if (handle_ > 0) {
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if (active_context_ == this) releaseDrawingContext();
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emscripten_webgl_destroy_context(handle_);
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}
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EM_ASM({ delete GL.offscreenCanvases[UTF8ToString($0).slice(1)]; }, selector_.c_str());
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}
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GHOST_TSuccess GHOST_ContextWeb::initializeDrawingContext()
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{
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if (handle_ > 0) return activateDrawingContext();
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EM_ASM({ GL.offscreenCanvases[UTF8ToString($0).slice(1)] = Module['canvas']; }, selector_.c_str());
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EmscriptenWebGLContextAttributes attributes;
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emscripten_webgl_init_context_attributes(&attributes);
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attributes.alpha = EM_FALSE;
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attributes.depth = EM_TRUE;
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attributes.stencil = EM_TRUE;
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attributes.antialias = EM_FALSE;
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/* File-save thumbnails read the last native window contents without drawing
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* again (drawing can mutate Main during save). Keep those pixels available
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* after OffscreenCanvas presentation and the worker event-loop yield. */
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attributes.preserveDrawingBuffer = EM_TRUE;
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attributes.majorVersion = 2;
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attributes.enableExtensionsByDefault = EM_TRUE;
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/* OffscreenCanvas presents when the owning worker yields to its event loop. */
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attributes.explicitSwapControl = EM_FALSE;
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handle_ = emscripten_webgl_create_context(selector_.c_str(), &attributes);
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return activateDrawingContext();
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}
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GHOST_TSuccess GHOST_ContextWeb::activateDrawingContext()
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{
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if (handle_ <= 0 || emscripten_is_webgl_context_lost(handle_) ||
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emscripten_webgl_make_context_current(handle_) != EMSCRIPTEN_RESULT_SUCCESS)
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{
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return GHOST_kFailure;
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}
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active_context_ = this;
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return GHOST_kSuccess;
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}
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bool GHOST_ContextWeb::isContextLost() const
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{
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return handle_ > 0 && emscripten_is_webgl_context_lost(handle_);
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}
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GHOST_TSuccess GHOST_ContextWeb::releaseDrawingContext()
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{
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if (active_context_ != this) return GHOST_kSuccess;
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if (emscripten_webgl_make_context_current(0) != EMSCRIPTEN_RESULT_SUCCESS) return GHOST_kFailure;
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active_context_ = nullptr;
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return GHOST_kSuccess;
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}
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GHOST_TSuccess GHOST_ContextWeb::updateDrawingContext()
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{
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return activateDrawingContext();
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}
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GHOST_TSuccess GHOST_ContextWeb::releaseNativeHandles()
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{
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/* The canvas must remain alive until the context is destroyed. */
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return GHOST_kFailure;
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}
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GHOST_TSuccess GHOST_ContextWeb::swapBufferAcquire()
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{
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return activateDrawingContext();
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}
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GHOST_TSuccess GHOST_ContextWeb::swapBufferRelease()
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{
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if (!activateDrawingContext()) return GHOST_kFailure;
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glFlush();
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return GHOST_kSuccess;
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}
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GHOST_TSuccess GHOST_ContextWeb::setSwapInterval(int interval)
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{
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return interval == 1 ? GHOST_kSuccess : GHOST_kFailure;
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}
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GHOST_TSuccess GHOST_ContextWeb::getSwapInterval(int &interval)
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{
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interval = 1;
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return GHOST_kSuccess;
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}
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