WGLWindow.cpp

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Author : Jamie Madill
Date : 2019-05-01 15:11:46
Hash : 3089f92e
Message : Move EGL Display config into EGLPlatformParameters. This CL moves all of the EGLDisplay configuration into an EGL platform struct. Consolidating display configuration in the struct allows us to move configuration out of the test constructor. Then when we filter test configs we don't need to wait for the individual test setup. Bug: angleproject:3393 Change-Id: I5bd06dcdc9f2867ebc43c1d4984077ada35cafc8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1574674 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>

util/windows/WGLWindow.cpp

//
// Copyright 2018 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// WGLWindow:
//   Implements initializing a WGL rendering context.
//

#include "util/windows/WGLWindow.h"

#include "common/string_utils.h"
#include "util/OSWindow.h"
#include "util/system_utils.h"

#include <iostream>

namespace
{
PIXELFORMATDESCRIPTOR GetDefaultPixelFormatDescriptor()
{
    PIXELFORMATDESCRIPTOR pixelFormatDescriptor = {0};
    pixelFormatDescriptor.nSize                 = sizeof(pixelFormatDescriptor);
    pixelFormatDescriptor.nVersion              = 1;
    pixelFormatDescriptor.dwFlags =
        PFD_DRAW_TO_WINDOW | PFD_GENERIC_ACCELERATED | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pixelFormatDescriptor.iPixelType   = PFD_TYPE_RGBA;
    pixelFormatDescriptor.cColorBits   = 24;
    pixelFormatDescriptor.cAlphaBits   = 8;
    pixelFormatDescriptor.cDepthBits   = 24;
    pixelFormatDescriptor.cStencilBits = 8;
    pixelFormatDescriptor.iLayerType   = PFD_MAIN_PLANE;

    return pixelFormatDescriptor;
}

PFNWGLGETPROCADDRESSPROC gCurrentWGLGetProcAddress = nullptr;
HMODULE gCurrentModule                             = nullptr;

angle::GenericProc WINAPI GetProcAddressWithFallback(const char *name)
{
    angle::GenericProc proc = reinterpret_cast<angle::GenericProc>(gCurrentWGLGetProcAddress(name));
    if (proc)
    {
        return proc;
    }

    return reinterpret_cast<angle::GenericProc>(GetProcAddress(gCurrentModule, name));
}

bool HasExtension(const std::vector<std::string> &extensions, const char *ext)
{
    return std::find(extensions.begin(), extensions.end(), ext) != extensions.end();
}

void DumpLastWindowsError()
{
    std::cerr << "Last Windows error code: 0x" << std::hex << GetLastError() << std::endl;
}
}  // namespace

WGLWindow::WGLWindow(int glesMajorVersion, int glesMinorVersion)
    : GLWindowBase(glesMajorVersion, glesMinorVersion),
      mDeviceContext(nullptr),
      mWGLContext(nullptr),
      mWindow(nullptr)
{}

WGLWindow::~WGLWindow() {}

// Internally initializes GL resources.
bool WGLWindow::initializeGL(OSWindow *osWindow,
                             angle::Library *glWindowingLibrary,
                             const EGLPlatformParameters &platformParams,
                             const ConfigParameters &configParams)
{
    glWindowingLibrary->getAs("wglGetProcAddress", &gCurrentWGLGetProcAddress);

    if (!gCurrentWGLGetProcAddress)
    {
        std::cerr << "Error loading wglGetProcAddress." << std::endl;
        return false;
    }

    gCurrentModule = reinterpret_cast<HMODULE>(glWindowingLibrary->getNative());
    angle::LoadWGL(GetProcAddressWithFallback);

    mWindow                                           = osWindow->getNativeWindow();
    mDeviceContext                                    = GetDC(mWindow);
    const PIXELFORMATDESCRIPTOR pixelFormatDescriptor = GetDefaultPixelFormatDescriptor();

    int pixelFormat = ChoosePixelFormat(mDeviceContext, &pixelFormatDescriptor);
    if (pixelFormat == 0)
    {
        std::cerr << "Could not find a compatible pixel format." << std::endl;
        DumpLastWindowsError();
        return false;
    }

    // According to the Windows docs, it is an error to set a pixel format twice.
    int currentPixelFormat = GetPixelFormat(mDeviceContext);
    if (currentPixelFormat != pixelFormat)
    {
        if (SetPixelFormat(mDeviceContext, pixelFormat, &pixelFormatDescriptor) != TRUE)
        {
            std::cerr << "Failed to set the pixel format." << std::endl;
            DumpLastWindowsError();
            return false;
        }
    }

    mWGLContext = _wglCreateContext(mDeviceContext);
    if (!mWGLContext)
    {
        std::cerr << "Failed to create a WGL context." << std::endl;
        return false;
    }

    if (!makeCurrent())
    {
        return false;
    }

    // Reload entry points to capture extensions.
    angle::LoadWGL(GetProcAddressWithFallback);

    if (!_wglGetExtensionsStringARB)
    {
        std::cerr << "Driver does not expose wglGetExtensionsStringARB." << std::endl;
        return false;
    }

    const char *extensionsString = _wglGetExtensionsStringARB(mDeviceContext);

    std::vector<std::string> extensions;
    angle::SplitStringAlongWhitespace(extensionsString, &extensions);

    if (!HasExtension(extensions, "WGL_EXT_create_context_es2_profile"))
    {
        std::cerr << "Driver does not expose WGL_EXT_create_context_es2_profile." << std::endl;
        return false;
    }

    if (configParams.webGLCompatibility.valid() || configParams.robustResourceInit.valid())
    {
        std::cerr << "WGLWindow does not support the requested feature set." << std::endl;
        return false;
    }

    // Tear down the context and create another with ES2 compatibility.
    _wglDeleteContext(mWGLContext);

    // This could be extended to cover ES1 compatiblity.
    int kCreateAttribs[] = {WGL_CONTEXT_MAJOR_VERSION_ARB,
                            mClientMajorVersion,
                            WGL_CONTEXT_MINOR_VERSION_ARB,
                            mClientMinorVersion,
                            WGL_CONTEXT_PROFILE_MASK_ARB,
                            WGL_CONTEXT_ES2_PROFILE_BIT_EXT,
                            0,
                            0};

    mWGLContext = _wglCreateContextAttribsARB(mDeviceContext, nullptr, kCreateAttribs);
    if (!mWGLContext)
    {
        std::cerr << "Failed to create an ES2 compatible WGL context." << std::endl;
        return false;
    }

    if (!makeCurrent())
    {
        return false;
    }

    mPlatform     = platformParams;
    mConfigParams = configParams;

    angle::LoadGLES(GetProcAddressWithFallback);
    return true;
}

void WGLWindow::destroyGL()
{
    if (mWGLContext)
    {
        _wglDeleteContext(mWGLContext);
        mWGLContext = nullptr;
    }

    if (mDeviceContext)
    {
        ReleaseDC(mWindow, mDeviceContext);
        mDeviceContext = nullptr;
    }
}

bool WGLWindow::isGLInitialized() const
{
    return mWGLContext != nullptr;
}

bool WGLWindow::makeCurrent()
{
    if (_wglMakeCurrent(mDeviceContext, mWGLContext) == FALSE)
    {
        std::cerr << "Error during wglMakeCurrent.\n";
        return false;
    }

    return true;
}

bool WGLWindow::setSwapInterval(EGLint swapInterval)
{
    if (!_wglSwapIntervalEXT || _wglSwapIntervalEXT(swapInterval) == FALSE)
    {
        std::cerr << "Error during wglSwapIntervalEXT.\n";
        return false;
    }
    return true;
}

void WGLWindow::swap()
{
    if (SwapBuffers(mDeviceContext) == FALSE)
    {
        std::cerr << "Error during SwapBuffers.\n";
    }
}

bool WGLWindow::hasError() const
{
    return GetLastError() != S_OK;
}

// static
WGLWindow *WGLWindow::New(int glesMajorVersion, int glesMinorVersion)
{
    return new WGLWindow(glesMajorVersion, glesMinorVersion);
}

// static
void WGLWindow::Delete(WGLWindow **window)
{
    delete *window;
    *window = nullptr;
}

kc3-lang/angle/util/windows/WGLWindow.cpp

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kc3-lang/angle /util/windows/WGLWindow.cpp