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kc3-lang/angle/samples/sample_util/SampleApplication.cpp

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  • Author : Shahbaz Youssefi
    Date : 2019-06-30 03:26:18
    Hash : e54d0f90
    Message : Vulkan: Debug overlay A debug overlay system for the Vulkan backend designed with efficiency and runtime configurability in mind. Overlay widgets are of two fundamental types: - Text widgets: A single line of text with small, medium or large font. - Graph widgets: A bar graph of data. Built on these, various overlay widget types are defined that gather statistics. Five such types are defined with one widget per type as example: - Count: A widget that counts something. VulkanValidationMessageCount is an overlay widget of this type that shows the number of validation messages received from the validation layers. - Text: A generic text. VulkanLastValidationMessage is an overlay widget of this type that shows the last validation message. - PerSecond: A value that gets reset every second automatically. FPS is an overlay widget of this type that simply gets incremented on every swap(). - RunningGraph: A graph of last N values. VulkanCommandGraphSize is an overlay of this type. On every vkQueueSubmit, the number of nodes in the command graph is accumulated. On every present(), the value is taken as the number of nodes for the whole duration of the frame. - RunningHistogram: A histogram of last N values. Input values are in the [0, 1] range and they are ranked to N buckets for histogram calculation. VulkanSecondaryCommandBufferPoolWaste is an overlay widget of this type. On vkQueueSubmit, the memory waste from command buffer pool allocations is recorded in the histogram. Overlay font is placed in libANGLE/overlay/ which gen_overlay_fonts.py processes to create an array of bits, which is processed at runtime to create the actual font image (an image with 3 layers). The overlay widget layout is defined in overlay_widgets.json which gen_overlay_widgets.py processes to generate an array of widgetss, each of its respective type, and sets their properties, such as color and bounding box. The json file allows widgets to align against other widgets as well as against the framebuffer edges. Two compute shaders are implemented to efficiently render the UI: - OverlayCull: This shader creates a bitset of Text and Graph widgets whose bounding boxes intersect a corresponding subgroup processed by OverlayDraw. This is done only when the enabled overlay widgets are changed (a feature that is not yet implemented) or the surface is resized. - OverlayDraw: Using the bitsets generated by OverlayCull, values that are uniform for each workgroup (set to be equal to hardware subgroup size), this shader loops over enabled widgets that can possibly intersect the pixel being processed and renders and blends in texts and graphs. This is done once per frame on present(). Currently, to enable overlay widgets an environment variable is used. For example: $ export ANGLE_OVERLAY=FPS:VulkanSecondaryCommandBufferPoolWaste $ ./hello_triangle --use-angle=vulkan Possible future work: - On Android, add settings in developer options and enable widgets based on those. - Spawn a small server in ANGLE and write an application that sends enable/disable commands remotely. - Implement overlay for other backends. Bug: angleproject:3757 Change-Id: If9c6974d1935c18f460ec569e79b41188bd7afcc Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1729440 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

  • samples/sample_util/SampleApplication.cpp 
  • //
// Copyright 2013 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.
//

#include "SampleApplication.h"

#include "util/EGLWindow.h"
#include "util/gles_loader_autogen.h"
#include "util/random_utils.h"
#include "util/system_utils.h"

#include <string.h>
#include <iostream>
#include <utility>

namespace
{
const char *kUseAngleArg = "--use-angle=";

using DisplayTypeInfo = std::pair<const char *, EGLint>;

const DisplayTypeInfo kDisplayTypes[] = {
    {"d3d9", EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE}, {"d3d11", EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE},
    {"gl", EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE}, {"gles", EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE},
    {"null", EGL_PLATFORM_ANGLE_TYPE_NULL_ANGLE}, {"vulkan", EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE}};

EGLint GetDisplayTypeFromArg(const char *displayTypeArg)
{
    for (const auto &displayTypeInfo : kDisplayTypes)
    {
        if (strcmp(displayTypeInfo.first, displayTypeArg) == 0)
        {
            std::cout << "Using ANGLE back-end API: " << displayTypeInfo.first << std::endl;
            return displayTypeInfo.second;
        }
    }

    std::cout << "Unknown ANGLE back-end API: " << displayTypeArg << std::endl;
    return EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE;
}
}  // anonymous namespace

SampleApplication::SampleApplication(std::string name,
                                     int argc,
                                     char **argv,
                                     EGLint glesMajorVersion,
                                     EGLint glesMinorVersion,
                                     uint32_t width,
                                     uint32_t height)
    : mName(std::move(name)),
      mWidth(width),
      mHeight(height),
      mRunning(false),
      mEGLWindow(nullptr),
      mOSWindow(nullptr)
{
    mPlatformParams.renderer = EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE;

    if (argc > 1 && strncmp(argv[1], kUseAngleArg, strlen(kUseAngleArg)) == 0)
    {
        mPlatformParams.renderer = GetDisplayTypeFromArg(argv[1] + strlen(kUseAngleArg));
    }

    // Load EGL library so we can initialize the display.
    mEntryPointsLib.reset(
        angle::OpenSharedLibrary(ANGLE_EGL_LIBRARY_NAME, angle::SearchType::ApplicationDir));

    mEGLWindow = EGLWindow::New(glesMajorVersion, glesMinorVersion);
    mOSWindow  = OSWindow::New();
}

SampleApplication::~SampleApplication()
{
    EGLWindow::Delete(&mEGLWindow);
    OSWindow::Delete(&mOSWindow);
}

bool SampleApplication::initialize()
{
    return true;
}

void SampleApplication::destroy() {}

void SampleApplication::step(float dt, double totalTime) {}

void SampleApplication::draw() {}

void SampleApplication::swap()
{
    mEGLWindow->swap();
}

OSWindow *SampleApplication::getWindow() const
{
    return mOSWindow;
}

EGLConfig SampleApplication::getConfig() const
{
    return mEGLWindow->getConfig();
}

EGLDisplay SampleApplication::getDisplay() const
{
    return mEGLWindow->getDisplay();
}

EGLSurface SampleApplication::getSurface() const
{
    return mEGLWindow->getSurface();
}

EGLContext SampleApplication::getContext() const
{
    return mEGLWindow->getContext();
}

int SampleApplication::run()
{
    if (!mOSWindow->initialize(mName, mWidth, mHeight))
    {
        return -1;
    }

    mOSWindow->setVisible(true);

    ConfigParameters configParams;
    configParams.redBits     = 8;
    configParams.greenBits   = 8;
    configParams.blueBits    = 8;
    configParams.alphaBits   = 8;
    configParams.depthBits   = 24;
    configParams.stencilBits = 8;

    if (!mEGLWindow->initializeGL(mOSWindow, mEntryPointsLib.get(), mPlatformParams, configParams))
    {
        return -1;
    }

    // Disable vsync
    if (!mEGLWindow->setSwapInterval(0))
    {
        return -1;
    }

    angle::LoadGLES(eglGetProcAddress);

    mRunning   = true;
    int result = 0;

    if (!initialize())
    {
        mRunning = false;
        result   = -1;
    }

    mTimer.start();
    double prevTime = 0.0;

    while (mRunning)
    {
        double elapsedTime = mTimer.getElapsedTime();
        double deltaTime   = elapsedTime - prevTime;

        step(static_cast<float>(deltaTime), elapsedTime);

        // Clear events that the application did not process from this frame
        Event event;
        while (popEvent(&event))
        {
            // If the application did not catch a close event, close now
            if (event.Type == Event::EVENT_CLOSED)
            {
                exit();
            }
        }

        if (!mRunning)
        {
            break;
        }

        draw();
        swap();

        mOSWindow->messageLoop();

        prevTime = elapsedTime;
    }

    destroy();
    mEGLWindow->destroyGL();
    mOSWindow->destroy();

    return result;
}

void SampleApplication::exit()
{
    mRunning = false;
}

bool SampleApplication::popEvent(Event *event)
{
    return mOSWindow->popEvent(event);
}