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Allow for a more modular renderer backends (#990)
* Draft GPU3D renderer modularization * Update sources C++ standard to C++17 The top-level `CMakeLists.txt` is already using the C++17 standard. * Move GLCompositor into class type Some other misc fixes to push towards better modularity * Make renderer-implementation types move-only These types are going to be holding onto handles of GPU-side resources and shouldn't ever be copied around. * Fix OSX: Remove 'register' storage class specifier `register` has been removed in C++17... But this keyword hasn't done anything in years anyways. OSX builds consider this "warning" an error and it stops the whole build. * Add RestartFrame to Renderer3D interface * Move Accelerated property to Renderer3D interface There are points in the code base where we do: `renderer != 0` to know if we are feeding an openGL renderer. Rather than that we can instead just have this be a property of the renderer itself. With this pattern a renderer can just say how it wants its data to come in rather than have everyone know that they're talking to an OpenGL renderer. * Remove Accelerated flag from GPU * Move 2D_Soft interface in separate header Also make the current 2D engine an "owned" unique_ptr. * Update alignment attribute to standard alignas Uses standardized `alignas` rather than compiler-specific attributes. https://en.cppreference.com/w/cpp/language/alignas * Fix Clang: alignas specifier Alignment must be specified before the array to align the entire array. https://en.cppreference.com/w/cpp/language/alignas * Converted Renderer3D Accelerated to variable This flag is checked a lot during scanline rasterization. So rather than having an expensive vtable-lookup call during mainline rendering code, it is now a public constant bool type that is written to only once during Renderer3D initialization.
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src/GPU_OpenGL.h
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src/GPU_OpenGL.h
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/*
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Copyright 2016-2020 Arisotura
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#pragma once
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#include "OpenGLSupport.h"
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namespace GPU
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{
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struct RenderSettings;
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class GLCompositor
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{
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public:
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GLCompositor() = default;
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GLCompositor(const GLCompositor&) = delete;
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GLCompositor& operator=(const GLCompositor&) = delete;
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bool Init();
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void DeInit();
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void Reset();
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void SetRenderSettings(RenderSettings& settings);
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void Stop();
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void RenderFrame();
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void BindOutputTexture(int buf);
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private:
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int Scale;
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int ScreenH, ScreenW;
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GLuint CompShader[1][3];
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GLuint CompScaleLoc[1];
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GLuint Comp3DXPosLoc[1];
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GLuint CompVertexBufferID;
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GLuint CompVertexArrayID;
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struct CompVertex
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{
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float Position[2];
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float Texcoord[2];
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};
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CompVertex CompVertices[2 * 3*2];
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GLuint CompScreenInputTex;
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GLuint CompScreenOutputTex[2];
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GLuint CompScreenOutputFB[2];
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};
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}
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