moddable post-processing pipeline

components/fx/pass.hpp

@@ -0,0 +1,79 @@
+#ifndef OPENMW_COMPONENTS_FX_PASS_H
+#define OPENMW_COMPONENTS_FX_PASS_H
+
+#include <array>
+#include <string>
+#include <sstream>
+#include <cstdint>
+#include <unordered_set>
+#include <optional>
+
+#include <osg/Timer>
+#include <osg/Program>
+#include <osg/Shader>
+#include <osg/State>
+#include <osg/Texture2D>
+#include <osg/BlendEquation>
+#include <osg/BlendFunc>
+
+namespace fx
+{
+    class Technique;
+
+    class Pass
+    {
+    public:
+
+        enum class Order
+        {
+            Forward,
+            Post
+        };
+
+        enum class Type
+        {
+            None,
+            Pixel,
+            Compute
+        };
+
+        friend class Technique;
+
+        Pass(Type type=Type::Pixel, Order order=Order::Post, bool ubo = false);
+
+        void compile(Technique& technique, std::string_view preamble);
+
+        std::string_view getTarget() const { return mTarget; }
+
+        void prepareStateSet(osg::StateSet* stateSet, const std::string& name) const;
+
+        std::string getName() const { return mName; }
+
+        void dirty();
+
+    private:
+        std::string getPassHeader(Technique& technique, std::string_view preamble, bool fragOut = false);
+
+        bool mCompiled;
+
+        osg::ref_ptr<osg::Shader> mVertex;
+        osg::ref_ptr<osg::Shader> mFragment;
+        osg::ref_ptr<osg::Shader> mCompute;
+
+        Type mType;
+        Order mOrder;
+        std::string mName;
+        bool mLegacyGLSL;
+        bool mUBO;
+        bool mSupportsNormals;
+
+        std::string_view mTarget;
+        std::optional<osg::Vec4f> mClearColor;
+
+        std::optional<osg::BlendFunc::BlendFuncMode> mBlendSource;
+        std::optional<osg::BlendFunc::BlendFuncMode> mBlendDest;
+        std::optional<osg::BlendEquation::Equation> mBlendEq;
+    };
+}
+
+#endif