1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/gl/SharedSurfaceIO.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,150 @@
1.4 +/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "SharedSurfaceIO.h"
1.10 +#include "GLContextCGL.h"
1.11 +#include "mozilla/gfx/MacIOSurface.h"
1.12 +#include "mozilla/DebugOnly.h"
1.13 +#include "ScopedGLHelpers.h"
1.14 +
1.15 +namespace mozilla {
1.16 +namespace gl {
1.17 +
1.18 +using namespace gfx;
1.19 +
1.20 +/* static */ SharedSurface_IOSurface*
1.21 +SharedSurface_IOSurface::Create(MacIOSurface* surface, GLContext *gl, bool hasAlpha)
1.22 +{
1.23 + MOZ_ASSERT(surface);
1.24 + MOZ_ASSERT(gl);
1.25 +
1.26 + gfx::IntSize size(surface->GetWidth(), surface->GetHeight());
1.27 + return new SharedSurface_IOSurface(surface, gl, size, hasAlpha);
1.28 +}
1.29 +
1.30 +void
1.31 +SharedSurface_IOSurface::Fence()
1.32 +{
1.33 + mGL->MakeCurrent();
1.34 + mGL->fFlush();
1.35 +}
1.36 +
1.37 +bool
1.38 +SharedSurface_IOSurface::ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
1.39 + GLenum format, GLenum type, GLvoid *pixels)
1.40 +{
1.41 + // Calling glReadPixels when an IOSurface is bound to the current framebuffer
1.42 + // can cause corruption in following glReadPixel calls (even if they aren't
1.43 + // reading from an IOSurface).
1.44 + // We workaround this by copying to a temporary texture, and doing the readback
1.45 + // from that.
1.46 + MOZ_ASSERT(mGL->IsCurrent());
1.47 +
1.48 +
1.49 + ScopedTexture destTex(mGL);
1.50 + {
1.51 + ScopedFramebufferForTexture srcFB(mGL, ProdTexture(), ProdTextureTarget());
1.52 +
1.53 + ScopedBindFramebuffer bindFB(mGL, srcFB.FB());
1.54 + ScopedBindTexture bindTex(mGL, destTex.Texture());
1.55 + mGL->fCopyTexImage2D(LOCAL_GL_TEXTURE_2D, 0,
1.56 + HasAlpha() ? LOCAL_GL_RGBA : LOCAL_GL_RGB,
1.57 + x, y,
1.58 + width, height, 0);
1.59 + }
1.60 +
1.61 + ScopedFramebufferForTexture destFB(mGL, destTex.Texture());
1.62 +
1.63 + ScopedBindFramebuffer bindFB(mGL, destFB.FB());
1.64 + mGL->fReadPixels(0, 0, width, height, format, type, pixels);
1.65 + return true;
1.66 +}
1.67 +
1.68 +static void
1.69 +BackTextureWithIOSurf(GLContext* gl, GLuint tex, MacIOSurface* ioSurf)
1.70 +{
1.71 + MOZ_ASSERT(gl->IsCurrent());
1.72 +
1.73 + ScopedBindTexture texture(gl, tex, LOCAL_GL_TEXTURE_RECTANGLE_ARB);
1.74 +
1.75 + gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
1.76 + LOCAL_GL_TEXTURE_MIN_FILTER,
1.77 + LOCAL_GL_LINEAR);
1.78 + gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
1.79 + LOCAL_GL_TEXTURE_MAG_FILTER,
1.80 + LOCAL_GL_LINEAR);
1.81 + gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
1.82 + LOCAL_GL_TEXTURE_WRAP_S,
1.83 + LOCAL_GL_CLAMP_TO_EDGE);
1.84 + gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
1.85 + LOCAL_GL_TEXTURE_WRAP_T,
1.86 + LOCAL_GL_CLAMP_TO_EDGE);
1.87 +
1.88 + CGLContextObj cgl = GLContextCGL::Cast(gl)->GetCGLContext();
1.89 + MOZ_ASSERT(cgl);
1.90 +
1.91 + ioSurf->CGLTexImageIOSurface2D(cgl);
1.92 +}
1.93 +
1.94 +SharedSurface_IOSurface::SharedSurface_IOSurface(MacIOSurface* surface,
1.95 + GLContext* gl,
1.96 + const gfx::IntSize& size,
1.97 + bool hasAlpha)
1.98 + : SharedSurface_GL(SharedSurfaceType::IOSurface, AttachmentType::GLTexture, gl, size, hasAlpha)
1.99 + , mSurface(surface)
1.100 + , mCurConsGL(nullptr)
1.101 + , mConsTex(0)
1.102 +{
1.103 + gl->MakeCurrent();
1.104 + mProdTex = 0;
1.105 + gl->fGenTextures(1, &mProdTex);
1.106 + BackTextureWithIOSurf(gl, mProdTex, surface);
1.107 +}
1.108 +
1.109 +GLuint
1.110 +SharedSurface_IOSurface::ConsTexture(GLContext* consGL)
1.111 +{
1.112 + if (!mCurConsGL) {
1.113 + mCurConsGL = consGL;
1.114 + }
1.115 + MOZ_ASSERT(consGL == mCurConsGL);
1.116 +
1.117 + if (!mConsTex) {
1.118 + consGL->MakeCurrent();
1.119 + mConsTex = 0;
1.120 + consGL->fGenTextures(1, &mConsTex);
1.121 + BackTextureWithIOSurf(consGL, mConsTex, mSurface);
1.122 + }
1.123 +
1.124 + return mConsTex;
1.125 +}
1.126 +
1.127 +SharedSurface_IOSurface::~SharedSurface_IOSurface()
1.128 +{
1.129 + if (mProdTex) {
1.130 + DebugOnly<bool> success = mGL->MakeCurrent();
1.131 + MOZ_ASSERT(success);
1.132 + mGL->fDeleteTextures(1, &mProdTex);
1.133 + mGL->fDeleteTextures(1, &mConsTex); // This will work if we're shared.
1.134 + }
1.135 +}
1.136 +
1.137 +SharedSurface*
1.138 +SurfaceFactory_IOSurface::CreateShared(const gfx::IntSize& size)
1.139 +{
1.140 + bool hasAlpha = mReadCaps.alpha;
1.141 + RefPtr<MacIOSurface> surf =
1.142 + MacIOSurface::CreateIOSurface(size.width, size.height, 1.0, hasAlpha);
1.143 +
1.144 + if (!surf) {
1.145 + NS_WARNING("Failed to create MacIOSurface.");
1.146 + return nullptr;
1.147 + }
1.148 +
1.149 + return SharedSurface_IOSurface::Create(surf, mGL, hasAlpha);
1.150 +}
1.151 +
1.152 +}
1.153 +}
