RendererGL.h

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// Copyright © 2008-2023 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#pragma once
 
#include "graphics/RenderState.h"
#include "graphics/Renderer.h"
#include "graphics/Types.h"
#include "graphics/UniformBuffer.h"
 
#include "OpenGLLibs.h"
#include "RefCounted.h"
#include <stack>
#include <unordered_map>
 
namespace Graphics {
 
    class Texture;
    struct Settings;
 
    namespace OGL {
        class CachedVertexBuffer;
        class CommandList;
        class InstanceBuffer;
        class IndexBuffer;
        class Material;
        class MeshObject;
        class RenderState;
        class RenderStateCache;
        class RenderTarget;
        class Shader;
        class UniformBuffer;
        class UniformLinearBuffer;
        class VertexBuffer;
    } // namespace OGL
 
    class RendererOGL final : public Renderer {
    public:
        static void RegisterRenderer();
 
        RendererOGL(SDL_Window *window, const Graphics::Settings &vs, SDL_GLContext &glContext);
        virtual ~RendererOGL() override final;
 
        virtual const char *GetName() const override final { return "OpenGL 3.1, with extensions, renderer"; }
        virtual RendererType GetRendererType() const override final { return RENDERER_OPENGL_3x; }
 
        virtual void WriteRendererInfo(std::ostream &out) const override final;
 
        virtual void CheckRenderErrors(const char *func = nullptr, const int line = -1) const override final { CheckErrors(func, line); }
        static void CheckErrors(const char *func = nullptr, const int line = -1);
 
        virtual bool SupportsInstancing() override final { return true; }
 
        virtual int GetMaximumNumberAASamples() const override final;
        virtual bool GetNearFarRange(float &near_, float &far_) const override final;
 
        virtual bool BeginFrame() override final;
        virtual bool EndFrame() override final;
        virtual bool SwapBuffers() override final;
 
        virtual bool SetRenderTarget(RenderTarget *) override final;
        virtual bool SetScissor(ViewportExtents) override final;
 
        virtual bool ClearScreen() override final;
        virtual bool ClearDepthBuffer() override final;
        virtual bool SetClearColor(const Color &c) override final;
 
        virtual bool SetViewport(ViewportExtents v) override final;
        virtual ViewportExtents GetViewport() const override final { return m_viewport; }
 
        virtual bool SetTransform(const matrix4x4f &m) override final;
        virtual matrix4x4f GetTransform() const override final { return m_modelViewMat; }
 
        virtual bool SetPerspectiveProjection(float fov, float aspect, float near_, float far_) override final;
        virtual bool SetOrthographicProjection(float xmin, float xmax, float ymin, float ymax, float zmin, float zmax) override final;
        virtual bool SetProjection(const matrix4x4f &m) override final;
        virtual matrix4x4f GetProjection() const override final { return m_projectionMat; }
 
        virtual bool SetWireFrameMode(bool enabled) override final;
 
        virtual bool SetLightIntensity(Uint32 numlights, const float *intensity) override final;
        virtual bool SetLights(Uint32 numlights, const Light *l) override final;
        virtual Uint32 GetNumLights() const override final { return m_numLights; }
        virtual bool SetAmbientColor(const Color &c) override final;
 
        virtual bool FlushCommandBuffers() override final;
 
        virtual bool DrawBuffer(const VertexArray *v, Material *m) override final;
        virtual bool DrawBufferDynamic(VertexBuffer *v, uint32_t vtxOffset, IndexBuffer *i, uint32_t idxOffset, uint32_t numElems, Material *m) override final;
        virtual bool DrawMesh(MeshObject *, Material *) override final;
        virtual bool DrawMeshInstanced(MeshObject *, Material *, InstanceBuffer *) override final;
 
        virtual Material *CreateMaterial(const std::string &, const MaterialDescriptor &, const RenderStateDesc &) override final;
        virtual Material *CloneMaterial(const Material *, const MaterialDescriptor &, const RenderStateDesc &) override final;
        virtual Texture *CreateTexture(const TextureDescriptor &descriptor) override final;
        virtual RenderTarget *CreateRenderTarget(const RenderTargetDesc &) override final;
        virtual VertexBuffer *CreateVertexBuffer(const VertexBufferDesc &) override final;
        virtual IndexBuffer *CreateIndexBuffer(Uint32 size, BufferUsage, IndexBufferSize) override final;
        virtual InstanceBuffer *CreateInstanceBuffer(Uint32 size, BufferUsage) override final;
        virtual UniformBuffer *CreateUniformBuffer(Uint32 size, BufferUsage) override final;
        virtual MeshObject *CreateMeshObject(VertexBuffer *v, IndexBuffer *i) override final;
        virtual MeshObject *CreateMeshObjectFromArray(const VertexArray *v, IndexBuffer *i = nullptr, BufferUsage u = BUFFER_USAGE_STATIC) override final;
 
        virtual const RenderStateDesc &GetMaterialRenderState(const Graphics::Material *m) override final;
 
        OGL::UniformBuffer *GetLightUniformBuffer();
        OGL::UniformLinearBuffer *GetDrawUniformBuffer(Uint32 size);
        OGL::RenderStateCache *GetStateCache() { return m_renderStateCache.get(); }
 
        virtual bool ReloadShaders() override final;
 
        virtual bool Screendump(ScreendumpState &sd) override final;
        virtual bool FrameGrab(ScreendumpState &sd) override final;
 
        bool DrawMeshInternal(OGL::MeshObject *, PrimitiveType type);
        bool DrawMeshInstancedInternal(OGL::MeshObject *, OGL::InstanceBuffer *, PrimitiveType type);
        bool DrawMeshDynamicInternal(BufferBinding<OGL::VertexBuffer> vtxBind, BufferBinding<OGL::IndexBuffer> idxBind, PrimitiveType type);
 
    protected:
        virtual void PushState() override final{};
        virtual void PopState() override final{};
 
        size_t m_frameNum;
 
        Uint32 m_numLights;
        Uint32 m_numDirLights;
        float m_minZNear;
        float m_maxZFar;
        bool m_useCompressedTextures;
        bool m_useAnisotropicFiltering;
 
        // TODO: iterate shaderdef files on startup and cache by Shader name directive rather than filename fragment
        std::vector<std::pair<std::string, OGL::Shader *>> m_shaders;
        std::vector<std::unique_ptr<OGL::UniformLinearBuffer>> m_drawUniformBuffers;
        std::unique_ptr<OGL::RenderStateCache> m_renderStateCache;
        RefCountedPtr<OGL::UniformBuffer> m_lightUniformBuffer;
        bool m_useNVDepthRanged;
        OGL::RenderTarget *m_activeRenderTarget = nullptr;
        OGL::RenderTarget *m_windowRenderTarget = nullptr;
        std::unique_ptr<OGL::CommandList> m_drawCommandList;
 
        matrix4x4f m_modelViewMat;
        matrix4x4f m_projectionMat;
        ViewportExtents m_viewport;
        Color m_clearColor;
 
    private:
        static bool initted;
 
        struct DynamicBufferData {
            AttributeSet attrs;
            OGL::CachedVertexBuffer *vtxBuffer;
            RefCountedPtr<MeshObject> mesh;
        };
 
        using DynamicBufferMap = std::vector<DynamicBufferData>;
        static DynamicBufferMap s_DynamicDrawBufferMap;
 
        SDL_GLContext m_glContext;
    };
#define CHECKERRORS() RendererOGL::CheckErrors(__FUNCTION__, __LINE__)
 
} // namespace Graphics