Renderer.h

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include <functional>
#include <memory>
 
#include "visualization/rendering/MaterialModifier.h"
#include "visualization/rendering/RendererHandle.h"
 
namespace cloudViewer {
 
namespace t {
namespace geometry {
class Image;
}
}  // namespace t
 
namespace geometry {
class Image;
}
 
namespace core {
class Tensor;
}
 
namespace visualization {
namespace rendering {
 
class RenderToBuffer;
class Scene;
class View;
 
class ResourceLoadRequest {
public:
    using ErrorCallback = std::function<void(
            const ResourceLoadRequest&, const uint8_t, const std::string&)>;
 
    ResourceLoadRequest(const void* data, size_t data_size);
    explicit ResourceLoadRequest(const char* path);
 
    ResourceLoadRequest(const void* data,
                        size_t data_size,
                        ErrorCallback error_callback);
    ResourceLoadRequest(const char* path, ErrorCallback error_callback);
 
    const void* data_;
    const size_t data_size_;
    const std::string path_;
    ErrorCallback error_callback_;
};
 
class Renderer {
public:
    virtual ~Renderer() = default;
 
    virtual SceneHandle CreateScene() = 0;
    virtual Scene* GetScene(const SceneHandle& id) const = 0;
    virtual void DestroyScene(const SceneHandle& id) = 0;
 
    virtual void SetClearColor(const Eigen::Vector4f& color) = 0;
    virtual void UpdateSwapChain() = 0;
    virtual void UpdateBitmapSwapChain(int width, int height) = 0;
 
    virtual void BeginFrame() = 0;
    virtual void Draw() = 0;
    // If using the Filament renderer this must be called *before* EndFrame()!
    virtual void RequestReadPixels(
            int width,
            int height,
            std::function<void(std::shared_ptr<core::Tensor>)> callback) = 0;
    virtual void EndFrame() = 0;
 
    virtual void SetOnAfterDraw(std::function<void()> callback) = 0;
 
    virtual MaterialHandle AddMaterial(const ResourceLoadRequest& request) = 0;
    virtual MaterialInstanceHandle AddMaterialInstance(
            const MaterialHandle& material) = 0;
    virtual MaterialModifier& ModifyMaterial(const MaterialHandle& id) = 0;
    virtual MaterialModifier& ModifyMaterial(
            const MaterialInstanceHandle& id) = 0;
    virtual void RemoveMaterialInstance(const MaterialInstanceHandle& id) = 0;
 
    virtual TextureHandle AddTexture(const ResourceLoadRequest& request,
                                     bool srgb = false) = 0;
    virtual TextureHandle AddTexture(
            const std::shared_ptr<geometry::Image> image,
            bool srgb = false) = 0;
    virtual TextureHandle AddTexture(const t::geometry::Image& image,
                                     bool srgb = false) = 0;
    virtual bool UpdateTexture(TextureHandle texture,
                               const std::shared_ptr<geometry::Image> image,
                               bool srgb) = 0;
    virtual bool UpdateTexture(TextureHandle texture,
                               const t::geometry::Image& image,
                               bool srgb) = 0;
 
    virtual void RemoveTexture(const TextureHandle& id) = 0;
 
    virtual IndirectLightHandle AddIndirectLight(
            const ResourceLoadRequest& request) = 0;
    virtual void RemoveIndirectLight(const IndirectLightHandle& id) = 0;
 
    virtual SkyboxHandle AddSkybox(const ResourceLoadRequest& request) = 0;
    virtual void RemoveSkybox(const SkyboxHandle& id) = 0;
 
    virtual std::shared_ptr<RenderToBuffer> CreateBufferRenderer() = 0;
 
    void RenderToImage(
            View* view,
            Scene* scene,
            std::function<void(std::shared_ptr<geometry::Image>)> cb);
 
    // Returns a float image ranging from 0 (near plane) to 1 (far plane)
    void RenderToDepthImage(
            View* view,
            Scene* scene,
            std::function<void(std::shared_ptr<geometry::Image>)> cb,
            bool z_in_view_space = false);
};
 
}  // namespace rendering
}  // namespace visualization
}  // namespace cloudViewer