Implement rendering pipeline and post-processing (#12465)

Co-authored-by: Lars Mueller <appgurulars@gmx.de>
Co-authored-by: sfan5 <sfan5@live.de>
Co-authored-by: lhofhansl <lhofhansl@yahoo.com>

1 files changed, 61 insertions, 10 deletions

diff --git a/src/client/render/plain.h b/src/client/render/plain.h
index 80c17ed9f..5180304a4 100644
--- a/src/client/render/plain.h
+++ b/src/client/render/plain.h
@@ -20,19 +20,70 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #pragma once
 #include "core.h"
+#include "pipeline.h"
 
-class RenderingCorePlain : public RenderingCore
+/**
+ * Implements a pipeline step that renders the 3D scene
+ */
+class Draw3D : public RenderStep
 {
-protected:
-	int scale = 0;
-	video::ITexture *lowres = nullptr;
+public:
+	virtual void setRenderSource(RenderSource *) override {}
+	virtual void setRenderTarget(RenderTarget *target) override { m_target = target; }
+
+	virtual void reset(PipelineContext &context) override {}
+	virtual void run(PipelineContext &context) override;
+
+private:
+	RenderTarget *m_target {nullptr};
+};
+
+/**
+ * Implements a pipeline step that renders the game HUD
+ */
+class DrawHUD : public RenderStep
+{
+public:
+	virtual void setRenderSource(RenderSource *) override {}
+	virtual void setRenderTarget(RenderTarget *) override {}
+
+	virtual void reset(PipelineContext &context) override {}
+	virtual void run(PipelineContext &context) override;
+};
+
+class MapPostFxStep : public TrivialRenderStep
+{
+public:
+	virtual void setRenderTarget(RenderTarget *) override;
+	virtual void run(PipelineContext &context) override;
+private:
+	RenderTarget *target;
+};
 
-	void initTextures() override;
-	void clearTextures() override;
-	void beforeDraw() override;
-	void upscale();
+class RenderShadowMapStep : public TrivialRenderStep
+{
+public:
+	virtual void run(PipelineContext &context) override;
+};
 
+/**
+ * UpscaleStep step performs rescaling of the image 
+ * in the source texture 0 to the size of the target.
+ */
+class UpscaleStep : public RenderStep
+{
 public:
-	RenderingCorePlain(IrrlichtDevice *_device, Client *_client, Hud *_hud);
-	void drawAll() override;
+
+    virtual void setRenderSource(RenderSource *source) override { m_source = source; }
+    virtual void setRenderTarget(RenderTarget *target) override { m_target = target; }
+    virtual void reset(PipelineContext &context) override {};
+    virtual void run(PipelineContext &context) override;
+private:
+	RenderSource *m_source;
+	RenderTarget *m_target;
 };
+
+std::unique_ptr<RenderStep> create3DStage(Client *client, v2f scale);
+RenderStep* addUpscaling(RenderPipeline *pipeline, RenderStep *previousStep, v2f downscale_factor);
+
+void populatePlainPipeline(RenderPipeline *pipeline, Client *client);