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#5336: Add HeadlessOpenGLContext module (Windows-only at the moment b…
…eing). This relies on new GLEW dependencies present in the windeps repository.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| #include "HeadlessOpenGLContext.h" | ||
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| #ifdef WIN32 | ||
| #include <GL/wglew.h> | ||
| #endif | ||
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| namespace gl | ||
| { | ||
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| #ifdef WIN32 | ||
| class HeadlessOpenGLContext : | ||
| public IGLContext | ||
| { | ||
| private: | ||
| HGLRC _context; | ||
| static HGLRC _tempContext; | ||
| public: | ||
| HeadlessOpenGLContext() | ||
| { | ||
| MSG msg = { 0 }; | ||
| WNDCLASS wc = { 0 }; | ||
| wc.lpfnWndProc = WndProc; | ||
| wc.hInstance = ::GetModuleHandle(nullptr); | ||
| wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND); | ||
| wc.lpszClassName = L"testwindow"; | ||
| wc.style = CS_OWNDC; | ||
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| if (!RegisterClass(&wc)) throw std::runtime_error("Failed to register the window class"); | ||
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| CreateWindowW(wc.lpszClassName, L"testwindow", WS_OVERLAPPEDWINDOW, 0, 0, 640, 480, 0, 0, wc.hInstance, 0); | ||
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| while (_tempContext == nullptr && PeekMessage(&msg, NULL, 0, 0, 0) > 0) | ||
| { | ||
| DispatchMessage(&msg); | ||
| } | ||
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| _context = _tempContext; | ||
| _tempContext = nullptr; | ||
| } | ||
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| ~HeadlessOpenGLContext() | ||
| { | ||
| if (_context) | ||
| { | ||
| wglDeleteContext(_context); | ||
| } | ||
| } | ||
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| private: | ||
| static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) | ||
| { | ||
| switch (message) | ||
| { | ||
| case WM_CREATE: | ||
| { | ||
| PIXELFORMATDESCRIPTOR pfd = | ||
| { | ||
| sizeof(PIXELFORMATDESCRIPTOR), | ||
| 1, | ||
| PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER, //Flags | ||
| PFD_TYPE_RGBA, | ||
| 32, // color depth. | ||
| 0, 0, 0, 0, 0, 0, | ||
| 0, | ||
| 0, | ||
| 0, | ||
| 0, 0, 0, 0, | ||
| 24, // depth buffer bits | ||
| 8, // stencil bits | ||
| 0, // aux buffers. | ||
| PFD_MAIN_PLANE, | ||
| 0, | ||
| 0, 0, 0 | ||
| }; | ||
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| auto deviceContext = GetDC(hWnd); | ||
| int pixelFormat = ChoosePixelFormat(deviceContext, &pfd); | ||
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| SetPixelFormat(deviceContext, pixelFormat, &pfd); | ||
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| _tempContext = wglCreateContext(deviceContext); | ||
| wglMakeCurrent(deviceContext, _tempContext); | ||
| } | ||
| break; | ||
| default: | ||
| return DefWindowProc(hWnd, message, wParam, lParam); | ||
| } | ||
| return 0; | ||
| } | ||
| }; | ||
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| HGLRC HeadlessOpenGLContext::_tempContext; | ||
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| #endif | ||
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| void HeadlessOpenGLContextModule::initialiseModule(const IApplicationContext& ctx) | ||
| {} | ||
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| void HeadlessOpenGLContextModule::createContext() | ||
| { | ||
| #ifdef WIN32 | ||
| GlobalOpenGLContext().setSharedContext(std::make_shared<HeadlessOpenGLContext>()); | ||
| #else | ||
| #error "Headless openGL context not implemented for this platform." | ||
| #endif | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| #pragma once | ||
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| #include "imodule.h" | ||
| #include "igl.h" | ||
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| namespace gl | ||
| { | ||
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| class HeadlessOpenGLContextModule : | ||
| public RegisterableModule | ||
| { | ||
| public: | ||
| void createContext(); | ||
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| // Inherited via RegisterableModule | ||
| const std::string& getName() const override | ||
| { | ||
| static std::string _name("HeadlessOpenGLContext"); | ||
| return _name; | ||
| } | ||
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| const StringSet& getDependencies() const override | ||
| { | ||
| static StringSet _dependencies; | ||
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| if (_dependencies.empty()) | ||
| { | ||
| _dependencies.insert(MODULE_SHARED_GL_CONTEXT); | ||
| } | ||
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| return _dependencies; | ||
| } | ||
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| void initialiseModule(const IApplicationContext& ctx) override; | ||
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| void shutdownModule() | ||
| { | ||
| GlobalOpenGLContext().setSharedContext(IGLContext::Ptr()); | ||
| } | ||
| }; | ||
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| } |
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