DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (e67641c2e4cc)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "GLContextProvider.h"
#include "GLContextEAGL.h"
#include "nsDebug.h"
#include "nsIWidget.h"
#include "gfxPrefs.h"
#include "gfxFailure.h"
#include "prenv.h"
#include "mozilla/Preferences.h"
#include "mozilla/layers/CompositorOptions.h"
#include "mozilla/widget/CompositorWidget.h"
#include "GeckoProfiler.h"

#import <UIKit/UIKit.h>

namespace mozilla {
namespace gl {

using namespace mozilla::widget;

GLContextEAGL::GLContextEAGL(CreateContextFlags flags, const SurfaceCaps& caps,
                             EAGLContext* context, GLContext* sharedContext,
                             bool isOffscreen)
    : GLContext(flags, caps, sharedContext, isOffscreen)
    , mContext(context)
    , mBackbufferRB(0)
    , mBackbufferFB(0)
    , mLayer(nil)
{
}

GLContextEAGL::~GLContextEAGL()
{
    MakeCurrent();

    if (mBackbufferFB) {
        fDeleteFramebuffers(1, &mBackbufferFB);
    }

    if (mBackbufferRB) {
        fDeleteRenderbuffers(1, &mBackbufferRB);
    }

    MarkDestroyed();

    if (mLayer) {
      mLayer = nil;
    }

    if (mContext) {
      [EAGLContext setCurrentContext:nil];
      [mContext release];
    }
}

bool
GLContextEAGL::Init()
{
    if (!InitWithPrefix("gl", true))
        return false;

    return true;
}

bool
GLContextEAGL::AttachToWindow(nsIWidget* aWidget)
{
    // This should only be called once
    MOZ_ASSERT(!mBackbufferFB && !mBackbufferRB);

    UIView* view =
        reinterpret_cast<UIView*>(aWidget->GetNativeData(NS_NATIVE_WIDGET));

    if (!view) {
      MOZ_CRASH("no view!");
    }

    mLayer = [view layer];

    fGenFramebuffers(1, &mBackbufferFB);
    return RecreateRB();
}

bool
GLContextEAGL::RecreateRB()
{
    MakeCurrent();

    CAEAGLLayer* layer = (CAEAGLLayer*)mLayer;

    if (mBackbufferRB) {
        // It doesn't seem to be enough to just call renderbufferStorage: below,
        // we apparently have to recreate the RB.
        fDeleteRenderbuffers(1, &mBackbufferRB);
        mBackbufferRB = 0;
    }

    fGenRenderbuffers(1, &mBackbufferRB);
    fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mBackbufferRB);

    [mContext renderbufferStorage:LOCAL_GL_RENDERBUFFER
              fromDrawable:layer];

    fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mBackbufferFB);
    fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0,
                             LOCAL_GL_RENDERBUFFER, mBackbufferRB);

    return LOCAL_GL_FRAMEBUFFER_COMPLETE == fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
}

bool
GLContextEAGL::MakeCurrentImpl() const
{
    if (mContext) {
        if(![EAGLContext setCurrentContext:mContext]) {
            return false;
        }
    }
    return true;
}

bool
GLContextEAGL::IsCurrentImpl() const
{
    return [EAGLContext currentContext] == mContext;
}

bool
GLContextEAGL::SetupLookupFunction()
{
    return false;
}

bool
GLContextEAGL::IsDoubleBuffered() const
{
    return true;
}

bool
GLContextEAGL::SwapBuffers()
{
  AUTO_PROFILER_LABEL("GLContextEAGL::SwapBuffers", GRAPHICS);

  [mContext presentRenderbuffer:LOCAL_GL_RENDERBUFFER];
  return true;
}

void
GLContextEAGL::GetWSIInfo(nsCString* const out) const
{
    out->AppendLiteral("EAGL");
}

already_AddRefed<GLContext>
GLContextProviderEAGL::CreateWrappingExisting(void*, void*)
{
    return nullptr;
}

static GLContextEAGL*
GetGlobalContextEAGL()
{
    return static_cast<GLContextEAGL*>(GLContextProviderEAGL::GetGlobalContext());
}

static already_AddRefed<GLContext>
CreateEAGLContext(CreateContextFlags flags, bool aOffscreen, GLContextEAGL* sharedContext)
{
    EAGLRenderingAPI apis[] = { kEAGLRenderingAPIOpenGLES3, kEAGLRenderingAPIOpenGLES2 };

    // Try to create a GLES3 context if we can, otherwise fall back to GLES2
    EAGLContext* context = nullptr;
    for (EAGLRenderingAPI api : apis) {
        if (sharedContext) {
            context = [[EAGLContext alloc] initWithAPI:api
                       sharegroup:sharedContext->GetEAGLContext().sharegroup];
        } else {
            context = [[EAGLContext alloc] initWithAPI:api];
        }

        if (context) {
            break;
        }
    }

    if (!context) {
        return nullptr;
    }

    RefPtr<GLContextEAGL> glContext = new GLContextEAGL(flags, SurfaceCaps::ForRGBA(),
                                                        context, sharedContext,
                                                        aOffscreen);
    if (!glContext->Init()) {
        glContext = nullptr;
        return nullptr;
    }

    return glContext.forget();
}

already_AddRefed<GLContext>
GLContextProviderEAGL::CreateForCompositorWidget(CompositorWidget* aCompositorWidget, bool aForceAccelerated)
{
    return CreateForWindow(aCompositorWidget->RealWidget(),
                           aCompositorWidget->GetCompositorOptions().UseWebRender(),
                           aForceAccelerated);
}

already_AddRefed<GLContext>
GLContextProviderEAGL::CreateForWindow(nsIWidget* aWidget,
                                       bool aWebRender,
                                       bool aForceAccelerated)
{
    RefPtr<GLContext> glContext = CreateEAGLContext(CreateContextFlags::NONE, false,
                                                    GetGlobalContextEAGL());
    if (!glContext) {
        return nullptr;
    }

    if (!GLContextEAGL::Cast(glContext)->AttachToWindow(aWidget)) {
        return nullptr;
    }

    return glContext.forget();
}

already_AddRefed<GLContext>
GLContextProviderEAGL::CreateHeadless(CreateContextFlags flags,
                                      nsACString* const out_failureId)
{
    return CreateEAGLContext(flags, true, GetGlobalContextEAGL());
}

already_AddRefed<GLContext>
GLContextProviderEAGL::CreateOffscreen(const mozilla::gfx::IntSize& size,
                                       const SurfaceCaps& caps,
                                       CreateContextFlags flags,
                                       nsACString* const out_failureId)
{
    RefPtr<GLContext> glContext = CreateHeadless(flags, out_failureId);
    if (!glContext->InitOffscreen(size, caps)) {
        return nullptr;
    }

    return glContext.forget();
}

static RefPtr<GLContext> gGlobalContext;

GLContext*
GLContextProviderEAGL::GetGlobalContext()
{
    static bool triedToCreateContext = false;
    if (!triedToCreateContext) {
        triedToCreateContext = true;

        MOZ_RELEASE_ASSERT(!gGlobalContext, "GFX: Global GL context already initialized.");
        RefPtr<GLContext> temp = CreateHeadless(CreateContextFlags::NONE);
        gGlobalContext = temp;

        if (!gGlobalContext) {
            MOZ_CRASH("Failed to create global context");
        }
    }

    return gGlobalContext;
}

void
GLContextProviderEAGL::Shutdown()
{
    gGlobalContext = nullptr;
}

} /* namespace gl */
} /* namespace mozilla */