Add distance field rendering to OpenGL runtime

The old text rendering remains in the background and is used to render
clipped text, since that feature is not yet implemented for distance
field fonts. Building the runtime with Qt version older than 5.12.2 also
causes a fallback to the old text rendering.

Depth pass rendering also needs to be redone in the future to avoid
another full render pass.

Task-number: QT3DS-3210
Change-Id: Ib7666c437d23ae25e1872682f010df3721476a14
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.cpp b/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.cpp
index e0eedfd3..3c940805 100644
--- a/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.cpp
+++ b/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.cpp
@@ -65,6 +65,7 @@
 #include "Qt3DSRenderShaderCodeGeneratorV2.h"
 #include "Qt3DSRenderDefaultMaterialShaderGenerator.h"
 #include "Qt3DSRenderCustomMaterialShaderGenerator.h"
+#include "Qt3DSDistanceFieldRenderer.h"
 
 using namespace qt3ds::render;
 
@@ -85,6 +86,7 @@ struct SRenderContextCore : public IQt3DSRenderContextCore
     NVScopedRefCounted<ITextRendererCore> m_TextRenderer;
     NVScopedRefCounted<ITextRendererCore> m_OnscreenTexRenderer;
     NVScopedRefCounted<IPathManagerCore> m_PathManagerCore;
+    NVScopedRefCounted<ITextRendererCore> m_distanceFieldRenderer;
 
     QT3DSI32 mRefCount;
     SRenderContextCore(NVFoundationBase &fnd, IStringTable &strTable)
@@ -127,6 +129,11 @@ struct SRenderContextCore : public IQt3DSRenderContextCore
                                                    const char8_t *inPrimitivesDirectory) override;
     void SetTextRendererCore(ITextRendererCore &inRenderer) override { m_TextRenderer = inRenderer; }
     ITextRendererCore *GetTextRendererCore() override { return m_TextRenderer.mPtr; }
+    void setDistanceFieldRenderer(ITextRendererCore &inRenderer) override
+    {
+        m_distanceFieldRenderer = inRenderer;
+    }
+    ITextRendererCore *getDistanceFieldRenderer() override { return m_distanceFieldRenderer.mPtr; }
     void SetOnscreenTextRendererCore(ITextRendererCore &inRenderer) override
     {
         m_OnscreenTexRenderer = inRenderer;
@@ -213,6 +220,7 @@ struct SRenderContext : public IQt3DSRenderContext
     NVScopedRefCounted<IOffscreenRenderManager> m_OffscreenRenderManager;
     NVScopedRefCounted<IQt3DSRenderer> m_Renderer;
     NVScopedRefCounted<ITextRenderer> m_TextRenderer;
+    NVScopedRefCounted<ITextRenderer> m_distanceFieldRenderer;
     NVScopedRefCounted<ITextRenderer> m_OnscreenTextRenderer;
     NVScopedRefCounted<ITextTextureCache> m_TextTextureCache;
     NVScopedRefCounted<ITextTextureAtlas> m_TextTextureAtlas;
@@ -307,6 +315,15 @@ struct SRenderContext : public IQt3DSRenderContext
                 m_RenderContext->GetFoundation(), *m_TextRenderer, *m_RenderContext);
         }
 
+#if QT_VERSION >= QT_VERSION_CHECK(5,12,2)
+        ITextRendererCore *distanceFieldRenderer = inCore.getDistanceFieldRenderer();
+        if (distanceFieldRenderer) {
+            m_distanceFieldRenderer = distanceFieldRenderer->GetTextRenderer(ctx);
+            static_cast<Q3DSDistanceFieldRenderer *>(m_distanceFieldRenderer.mPtr)
+                    ->setContext(*this);
+        }
+#endif
+
         ITextRendererCore *theOnscreenTextCore = inCore.GetOnscreenTextRendererCore();
         if (theOnscreenTextCore) {
             m_OnscreenTextRenderer = theOnscreenTextCore->GetTextRenderer(ctx);
@@ -381,6 +398,8 @@ struct SRenderContext : public IQt3DSRenderContext
 
     ITextRenderer *GetTextRenderer() override { return m_TextRenderer; }
 
+    ITextRenderer *getDistanceFieldRenderer() override { return m_distanceFieldRenderer; }
+
     ITextRenderer *GetOnscreenTextRenderer() override { return m_OnscreenTextRenderer; }
 
     void SetSceneColor(Option<QT3DSVec4> inSceneColor) override { m_SceneColor = inSceneColor; }
@@ -797,6 +816,8 @@ struct SRenderContext : public IQt3DSRenderContext
             m_TextTextureCache->EndFrame();
         if (m_TextRenderer)
             m_TextRenderer->EndFrame();
+        if (m_distanceFieldRenderer)
+            m_distanceFieldRenderer->EndFrame();
         m_OffscreenRenderManager->EndFrame();
         m_Renderer->EndFrame();
         m_CustomMaterialSystem->EndFrame();