Implement CWorldShadow and texture clamp mode

Runtime/Graphics/Shaders/CWorldShadowShader.hpp

@@ -0,0 +1,55 @@
+#ifndef URDE_CWORLDSHADOWSHADER_HPP
+#define URDE_CWORLDSHADOWSHADER_HPP
+
+#include "TShader.hpp"
+#include "CColoredQuadFilter.hpp"
+#include "CTexturedQuadFilter.hpp"
+
+namespace urde
+{
+
+class CWorldShadowShader
+{
+    friend class CWorldShadowShaderGLDataBindingFactory;
+    friend class CWorldShadowShaderVulkanDataBindingFactory;
+    friend class CWorldShadowShaderD3DDataBindingFactory;
+    friend class CWorldShadowShaderMetalDataBindingFactory;
+
+    boo::ITextureR* m_tex;
+    std::experimental::optional<CTexturedQuadFilter> m_prevQuad;
+    u32 m_w, m_h;
+
+    struct Uniform
+    {
+        zeus::CMatrix4f m_matrix;
+        zeus::CColor m_color;
+    };
+    boo::GraphicsDataToken m_token;
+    boo::IGraphicsBufferD* m_vbo;
+    boo::IGraphicsBufferD* m_uniBuf;
+    boo::IShaderDataBinding* m_dataBind = nullptr;
+    boo::IShaderDataBinding* m_zDataBind = nullptr;
+    Uniform m_uniform;
+
+    void _buildTex(boo::IGraphicsDataFactory::Context& ctx);
+
+public:
+    CWorldShadowShader(u32 w, u32 h);
+    void bindRenderTarget();
+    void drawBase(float extent);
+    void lightenShadow();
+    void blendPreviousShadow();
+    void resolveTexture();
+
+    u32 GetWidth() const { return m_w; }
+    u32 GetHeight() const { return m_h; }
+
+    boo::ITexture* GetTexture() const { return m_tex; }
+
+    using _CLS = CWorldShadowShader;
+#include "TShaderDecl.hpp"
+};
+
+}
+
+#endif // URDE_CWORLDSHADOWSHADER_HPP