279 lines
11 KiB
C
279 lines
11 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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extern ComponentPeer* createNonRepaintingEmbeddedWindowsPeer (Component&, void* parent);
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//==============================================================================
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class OpenGLContext::NativeContext
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{
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public:
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NativeContext (Component& component,
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const OpenGLPixelFormat& pixelFormat,
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void* contextToShareWith,
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bool /*useMultisampling*/,
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OpenGLVersion)
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{
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dummyComponent.reset (new DummyComponent (*this));
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createNativeWindow (component);
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PIXELFORMATDESCRIPTOR pfd;
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initialisePixelFormatDescriptor (pfd, pixelFormat);
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auto pixFormat = ChoosePixelFormat (dc, &pfd);
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if (pixFormat != 0)
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SetPixelFormat (dc, pixFormat, &pfd);
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renderContext = wglCreateContext (dc);
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if (renderContext != 0)
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{
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makeActive();
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initialiseGLExtensions();
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auto wglFormat = wglChoosePixelFormatExtension (pixelFormat);
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deactivateCurrentContext();
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if (wglFormat != pixFormat && wglFormat != 0)
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{
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// can't change the pixel format of a window, so need to delete the
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// old one and create a new one..
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releaseDC();
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nativeWindow = nullptr;
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createNativeWindow (component);
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if (SetPixelFormat (dc, wglFormat, &pfd))
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{
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deleteRenderContext();
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renderContext = wglCreateContext (dc);
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}
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}
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if (contextToShareWith != nullptr)
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wglShareLists ((HGLRC) contextToShareWith, renderContext);
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component.getTopLevelComponent()->repaint();
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component.repaint();
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}
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}
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~NativeContext()
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{
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deleteRenderContext();
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releaseDC();
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}
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bool initialiseOnRenderThread (OpenGLContext& c)
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{
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context = &c;
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return true;
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}
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void shutdownOnRenderThread() { deactivateCurrentContext(); context = nullptr; }
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static void deactivateCurrentContext() { wglMakeCurrent (0, 0); }
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bool makeActive() const noexcept { return isActive() || wglMakeCurrent (dc, renderContext) != FALSE; }
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bool isActive() const noexcept { return wglGetCurrentContext() == renderContext; }
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void swapBuffers() const noexcept { SwapBuffers (dc); }
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bool setSwapInterval (int numFramesPerSwap)
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{
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jassert (isActive()); // this can only be called when the context is active..
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return wglSwapIntervalEXT != nullptr && wglSwapIntervalEXT (numFramesPerSwap) != FALSE;
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}
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int getSwapInterval() const
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{
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jassert (isActive()); // this can only be called when the context is active..
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return wglGetSwapIntervalEXT != nullptr ? wglGetSwapIntervalEXT() : 0;
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}
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void updateWindowPosition (Rectangle<int> bounds)
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{
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if (nativeWindow != nullptr)
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SetWindowPos ((HWND) nativeWindow->getNativeHandle(), 0,
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bounds.getX(), bounds.getY(), bounds.getWidth(), bounds.getHeight(),
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SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOOWNERZORDER);
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}
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bool createdOk() const noexcept { return getRawContext() != nullptr; }
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void* getRawContext() const noexcept { return renderContext; }
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unsigned int getFrameBufferID() const noexcept { return 0; }
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void triggerRepaint()
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{
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if (context != nullptr)
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context->triggerRepaint();
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}
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struct Locker { Locker (NativeContext&) {} };
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private:
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struct DummyComponent : public Component
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{
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DummyComponent (NativeContext& c) : context (c) {}
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// The windowing code will call this when a paint callback happens
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void handleCommandMessage (int) override { context.triggerRepaint(); }
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NativeContext& context;
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};
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std::unique_ptr<DummyComponent> dummyComponent;
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std::unique_ptr<ComponentPeer> nativeWindow;
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HGLRC renderContext;
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HDC dc;
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OpenGLContext* context = {};
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#define JUCE_DECLARE_WGL_EXTENSION_FUNCTION(name, returnType, params) \
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typedef returnType (__stdcall *type_ ## name) params; type_ ## name name;
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JUCE_DECLARE_WGL_EXTENSION_FUNCTION (wglChoosePixelFormatARB, BOOL, (HDC, const int*, const FLOAT*, UINT, int*, UINT*))
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JUCE_DECLARE_WGL_EXTENSION_FUNCTION (wglSwapIntervalEXT, BOOL, (int))
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JUCE_DECLARE_WGL_EXTENSION_FUNCTION (wglGetSwapIntervalEXT, int, ())
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#undef JUCE_DECLARE_WGL_EXTENSION_FUNCTION
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void initialiseGLExtensions()
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{
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#define JUCE_INIT_WGL_FUNCTION(name) name = (type_ ## name) OpenGLHelpers::getExtensionFunction (#name);
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JUCE_INIT_WGL_FUNCTION (wglChoosePixelFormatARB);
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JUCE_INIT_WGL_FUNCTION (wglSwapIntervalEXT);
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JUCE_INIT_WGL_FUNCTION (wglGetSwapIntervalEXT);
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#undef JUCE_INIT_WGL_FUNCTION
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}
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void createNativeWindow (Component& component)
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{
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auto* topComp = component.getTopLevelComponent();
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nativeWindow.reset (createNonRepaintingEmbeddedWindowsPeer (*dummyComponent, topComp->getWindowHandle()));
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if (auto* peer = topComp->getPeer())
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updateWindowPosition (peer->getAreaCoveredBy (component));
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nativeWindow->setVisible (true);
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dc = GetDC ((HWND) nativeWindow->getNativeHandle());
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}
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void deleteRenderContext()
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{
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if (renderContext != 0)
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{
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wglDeleteContext (renderContext);
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renderContext = 0;
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}
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}
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void releaseDC()
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{
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ReleaseDC ((HWND) nativeWindow->getNativeHandle(), dc);
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}
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static void initialisePixelFormatDescriptor (PIXELFORMATDESCRIPTOR& pfd, const OpenGLPixelFormat& pixelFormat)
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{
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zerostruct (pfd);
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pfd.nSize = sizeof (pfd);
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pfd.nVersion = 1;
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pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
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pfd.iPixelType = PFD_TYPE_RGBA;
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pfd.iLayerType = PFD_MAIN_PLANE;
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pfd.cColorBits = (BYTE) (pixelFormat.redBits + pixelFormat.greenBits + pixelFormat.blueBits);
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pfd.cRedBits = (BYTE) pixelFormat.redBits;
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pfd.cGreenBits = (BYTE) pixelFormat.greenBits;
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pfd.cBlueBits = (BYTE) pixelFormat.blueBits;
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pfd.cAlphaBits = (BYTE) pixelFormat.alphaBits;
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pfd.cDepthBits = (BYTE) pixelFormat.depthBufferBits;
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pfd.cStencilBits = (BYTE) pixelFormat.stencilBufferBits;
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pfd.cAccumBits = (BYTE) (pixelFormat.accumulationBufferRedBits + pixelFormat.accumulationBufferGreenBits
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+ pixelFormat.accumulationBufferBlueBits + pixelFormat.accumulationBufferAlphaBits);
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pfd.cAccumRedBits = (BYTE) pixelFormat.accumulationBufferRedBits;
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pfd.cAccumGreenBits = (BYTE) pixelFormat.accumulationBufferGreenBits;
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pfd.cAccumBlueBits = (BYTE) pixelFormat.accumulationBufferBlueBits;
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pfd.cAccumAlphaBits = (BYTE) pixelFormat.accumulationBufferAlphaBits;
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}
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int wglChoosePixelFormatExtension (const OpenGLPixelFormat& pixelFormat) const
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{
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int format = 0;
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if (wglChoosePixelFormatARB != nullptr)
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{
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int atts[64];
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int n = 0;
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atts[n++] = WGL_DRAW_TO_WINDOW_ARB; atts[n++] = GL_TRUE;
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atts[n++] = WGL_SUPPORT_OPENGL_ARB; atts[n++] = GL_TRUE;
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atts[n++] = WGL_DOUBLE_BUFFER_ARB; atts[n++] = GL_TRUE;
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atts[n++] = WGL_PIXEL_TYPE_ARB; atts[n++] = WGL_TYPE_RGBA_ARB;
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atts[n++] = WGL_ACCELERATION_ARB;
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atts[n++] = WGL_FULL_ACCELERATION_ARB;
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atts[n++] = WGL_COLOR_BITS_ARB; atts[n++] = pixelFormat.redBits + pixelFormat.greenBits + pixelFormat.blueBits;
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atts[n++] = WGL_RED_BITS_ARB; atts[n++] = pixelFormat.redBits;
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atts[n++] = WGL_GREEN_BITS_ARB; atts[n++] = pixelFormat.greenBits;
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atts[n++] = WGL_BLUE_BITS_ARB; atts[n++] = pixelFormat.blueBits;
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atts[n++] = WGL_ALPHA_BITS_ARB; atts[n++] = pixelFormat.alphaBits;
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atts[n++] = WGL_DEPTH_BITS_ARB; atts[n++] = pixelFormat.depthBufferBits;
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atts[n++] = WGL_STENCIL_BITS_ARB; atts[n++] = pixelFormat.stencilBufferBits;
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atts[n++] = WGL_ACCUM_RED_BITS_ARB; atts[n++] = pixelFormat.accumulationBufferRedBits;
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atts[n++] = WGL_ACCUM_GREEN_BITS_ARB; atts[n++] = pixelFormat.accumulationBufferGreenBits;
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atts[n++] = WGL_ACCUM_BLUE_BITS_ARB; atts[n++] = pixelFormat.accumulationBufferBlueBits;
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atts[n++] = WGL_ACCUM_ALPHA_BITS_ARB; atts[n++] = pixelFormat.accumulationBufferAlphaBits;
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if (pixelFormat.multisamplingLevel > 0
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&& OpenGLHelpers::isExtensionSupported ("GL_ARB_multisample"))
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{
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atts[n++] = WGL_SAMPLE_BUFFERS_ARB;
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atts[n++] = 1;
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atts[n++] = WGL_SAMPLES_ARB;
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atts[n++] = pixelFormat.multisamplingLevel;
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}
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atts[n++] = 0;
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jassert (n <= numElementsInArray (atts));
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UINT formatsCount = 0;
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wglChoosePixelFormatARB (dc, atts, nullptr, 1, &format, &formatsCount);
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}
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return format;
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}
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NativeContext)
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};
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//==============================================================================
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bool OpenGLHelpers::isContextActive()
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{
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return wglGetCurrentContext() != 0;
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}
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} // namespace juce
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