Adding template project

vendor/rmlui_backend/RmlUi_Renderer_SDL.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <RmlUi/Core/RenderInterface.h>
+
+#if RMLUI_SDL_VERSION_MAJOR == 3
+	#include <SDL3/SDL.h>
+#elif RMLUI_SDL_VERSION_MAJOR == 2
+	#include <SDL.h>
+#else
+	#error "Unspecified RMLUI_SDL_VERSION_MAJOR. Please set this definition to the major version of the SDL library being linked to."
+#endif
+
+class RenderInterface_SDL : public Rml::RenderInterface {
+public:
+	RenderInterface_SDL(SDL_Renderer* renderer);
+
+	// Sets up OpenGL states for taking rendering commands from RmlUi.
+	void BeginFrame();
+	void EndFrame();
+
+	// -- Inherited from Rml::RenderInterface --
+
+	Rml::CompiledGeometryHandle CompileGeometry(Rml::Span<const Rml::Vertex> vertices, Rml::Span<const int> indices) override;
+	void ReleaseGeometry(Rml::CompiledGeometryHandle geometry) override;
+	void RenderGeometry(Rml::CompiledGeometryHandle handle, Rml::Vector2f translation, Rml::TextureHandle texture) override;
+
+	Rml::TextureHandle LoadTexture(Rml::Vector2i& texture_dimensions, const Rml::String& source) override;
+	Rml::TextureHandle GenerateTexture(Rml::Span<const Rml::byte> source, Rml::Vector2i source_dimensions) override;
+	void ReleaseTexture(Rml::TextureHandle texture_handle) override;
+
+	void EnableScissorRegion(bool enable) override;
+	void SetScissorRegion(Rml::Rectanglei region) override;
+
+private:
+	struct GeometryView {
+		Rml::Span<const Rml::Vertex> vertices;
+		Rml::Span<const int> indices;
+	};
+
+	SDL_Renderer* renderer;
+	SDL_BlendMode blend_mode = {};
+	SDL_Rect rect_scissor = {};
+	bool scissor_region_enabled = false;
+	Rml::UniquePtr<SDL_Vertex[]> sdl_vertices;
+	size_t sdl_vertices_size = 0;
+};