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, 3 insertions, 0 deletions

diff --git a/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.h b/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.h
index be1498b8..012864ba 100644
--- a/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.h
+++ b/src/Runtime/Source/runtimerender/Qt3DSRenderContextCore.h
@@ -70,6 +70,8 @@ namespace render {
         // Text renderers may be provided by clients at runtime.
         virtual void SetTextRendererCore(ITextRendererCore &inRenderer) = 0;
         virtual ITextRendererCore *GetTextRendererCore() = 0;
+        virtual void setDistanceFieldRenderer(ITextRendererCore &inRenderer) = 0;
+        virtual ITextRendererCore *getDistanceFieldRenderer() = 0;
         // this is our default 2D text onscreen renderer
         virtual void SetOnscreenTextRendererCore(ITextRendererCore &inRenderer) = 0;
         virtual ITextRendererCore *GetOnscreenTextRendererCore() = 0;
@@ -106,6 +108,7 @@ namespace render {
         virtual IPerfTimer &GetPerfTimer() = 0;
         virtual ITextTextureCache *GetTextureCache() = 0;
         virtual ITextRenderer *GetTextRenderer() = 0;
+        virtual ITextRenderer *getDistanceFieldRenderer() = 0;
         virtual IRenderList &GetRenderList() = 0;
         virtual IPathManager &GetPathManager() = 0;
         virtual IShaderProgramGenerator &GetShaderProgramGenerator() = 0;