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Inital code for per map layer ImGui contexts

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This commit is contained in:
AdenKoperczak 2025-01-04 13:49:31 -05:00
parent e641c0b0e5
commit 6d107f6c2d
7 changed files with 153 additions and 15 deletions
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106
scwx-qt/source/scwx/qt/map/draw_layer.cpp
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@ -1,7 +1,14 @@
#include <scwx/qt/manager/font_manager.hpp>
#include <scwx/qt/map/draw_layer.hpp>
#include <scwx/qt/model/imgui_context_model.hpp>
#include <scwx/qt/gl/shader_program.hpp>
#include <scwx/util/logger.hpp>
#include <backends/imgui_impl_opengl3.h>
#include <backends/imgui_impl_qt.hpp>
#include <fmt/format.h>
#include <imgui.h>
namespace scwx
{
namespace qt
@ -16,18 +23,65 @@ class DrawLayerImpl
{
public:
explicit DrawLayerImpl(std::shared_ptr<MapContext> context) :
context_ {context}, drawList_ {}, textureAtlas_ {GL_INVALID_INDEX}
context_ {context},
drawList_ {},
textureAtlas_ {GL_INVALID_INDEX},
imGuiRendererInitialized_ {false}
{
static size_t currentMapId_ {0u};
imGuiContextName_ = fmt::format("Layer {}", ++currentMapId_);
imGuiContext_ =
model::ImGuiContextModel::Instance().CreateContext(imGuiContextName_);
// Initialize ImGui Qt backend
ImGui_ImplQt_Init();
}
~DrawLayerImpl() {}
~DrawLayerImpl()
{
// Set ImGui Context
ImGui::SetCurrentContext(imGuiContext_);
// Shutdown ImGui Context
if (imGuiRendererInitialized_)
{
ImGui_ImplOpenGL3_Shutdown();
}
ImGui_ImplQt_Shutdown();
// Destroy ImGui Context
model::ImGuiContextModel::Instance().DestroyContext(imGuiContextName_);
}
void ImGuiCheckFonts();
std::shared_ptr<MapContext> context_;
std::vector<std::shared_ptr<gl::draw::DrawItem>> drawList_;
GLuint textureAtlas_;
std::uint64_t textureAtlasBuildCount_ {};
std::string imGuiContextName_;
ImGuiContext* imGuiContext_;
bool imGuiRendererInitialized_;
std::uint64_t imGuiFontsBuildCount_ {};
};
void DrawLayerImpl::ImGuiCheckFonts()
{
// Update ImGui Fonts if required
std::uint64_t currentImGuiFontsBuildCount =
manager::FontManager::Instance().imgui_fonts_build_count();
if (imGuiFontsBuildCount_ != currentImGuiFontsBuildCount ||
!model::ImGuiContextModel::Instance().font_atlas()->IsBuilt())
{
ImGui_ImplOpenGL3_DestroyFontsTexture();
ImGui_ImplOpenGL3_CreateFontsTexture();
}
imGuiFontsBuildCount_ = currentImGuiFontsBuildCount;
}
DrawLayer::DrawLayer(const std::shared_ptr<MapContext>& context) :
GenericLayer(context), p(std::make_unique<DrawLayerImpl>(context))
{
@ -42,9 +96,48 @@ void DrawLayer::Initialize()
{
item->Initialize();
}
ImGuiInitialize();
}
void DrawLayer::Render(const QMapLibre::CustomLayerRenderParameters& params)
void DrawLayer::StartImGuiFrame()
{
auto defaultFont = manager::FontManager::Instance().GetImGuiFont(
types::FontCategory::Default);
// Setup ImGui Frame
ImGui::SetCurrentContext(p->imGuiContext_);
// Start ImGui Frame
ImGui_ImplQt_NewFrame(p->context_->widget());
ImGui_ImplOpenGL3_NewFrame();
p->ImGuiCheckFonts();
ImGui::NewFrame();
ImGui::PushFont(defaultFont->font());
}
void DrawLayer::EndImGuiFrame()
{
// Pop default font
ImGui::PopFont();
// Render ImGui Frame
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}
void DrawLayer::ImGuiInitialize()
{
ImGui::SetCurrentContext(p->imGuiContext_);
ImGui_ImplQt_RegisterWidget(p->context_->widget());
ImGui_ImplOpenGL3_Init();
p->imGuiFontsBuildCount_ =
manager::FontManager::Instance().imgui_fonts_build_count();
p->imGuiRendererInitialized_ = true;
}
void DrawLayer::RenderWithoutImGui(
const QMapLibre::CustomLayerRenderParameters& params)
{
gl::OpenGLFunctions& gl = p->context_->gl();
p->textureAtlas_ = p->context_->GetTextureAtlas();
@ -69,6 +162,13 @@ void DrawLayer::Render(const QMapLibre::CustomLayerRenderParameters& params)
p->textureAtlasBuildCount_ = newTextureAtlasBuildCount;
}
void DrawLayer::Render(const QMapLibre::CustomLayerRenderParameters& params)
{
StartImGuiFrame();
RenderWithoutImGui(params);
EndImGuiFrame();
}
void DrawLayer::Deinitialize()
{
p->textureAtlas_ = GL_INVALID_INDEX;