ui/gl/gl_surface.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GL_GL_SURFACE_H_
   6 #define UI_GL_GL_SURFACE_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "build/build_config.h"
  12 #include "ui/gfx/native_widget_types.h"
  13 #include "ui/gfx/overlay_transform.h"
  14 #include "ui/gfx/rect.h"
  15 #include "ui/gfx/rect_f.h"
  16 #include "ui/gfx/size.h"
  17 #include "ui/gl/gl_export.h"
  18 #include "ui/gl/gl_implementation.h"
  19
  20 namespace gfx {
  21
  22 class GLContext;
  23 class GLImage;
  24 class VSyncProvider;
  25
  26 // Encapsulates a surface that can be rendered to with GL, hiding platform
  27 // specific management.
  28 class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
  29  public:
  30   GLSurface();
  31
  32   // (Re)create the surface. TODO(apatrick): This is an ugly hack to allow the
  33   // EGL surface associated to be recreated without destroying the associated
  34   // context. The implementation of this function for other GLSurface derived
  35   // classes is in a pending changelist.
  36   virtual bool Initialize();
  37
  38   // Destroys the surface.
  39   virtual void Destroy() = 0;
  40
  41   virtual bool Resize(const gfx::Size& size);
  42
  43   // Recreate the surface without changing the size.
  44   virtual bool Recreate();
  45
  46   // Unschedule the GpuScheduler and return true to abort the processing of
  47   // a GL draw call to this surface and defer it until the GpuScheduler is
  48   // rescheduled.
  49   virtual bool DeferDraws();
  50
  51   // Returns true if this surface is offscreen.
  52   virtual bool IsOffscreen() = 0;
  53
  54   // Swaps front and back buffers. This has no effect for off-screen
  55   // contexts.
  56   virtual bool SwapBuffers() = 0;
  57
  58   // Get the size of the surface.
  59   virtual gfx::Size GetSize() = 0;
  60
  61   // Get the underlying platform specific surface "handle".
  62   virtual void* GetHandle() = 0;
  63
  64   // Returns whether or not the surface supports PostSubBuffer.
  65   virtual bool SupportsPostSubBuffer();
  66
  67   // Returns the internal frame buffer object name if the surface is backed by
  68   // FBO. Otherwise returns 0.
  69   virtual unsigned int GetBackingFrameBufferObject();
  70
  71   // Copy part of the backbuffer to the frontbuffer.
  72   virtual bool PostSubBuffer(int x, int y, int width, int height);
  73
  74   // Initialize GL bindings.
  75   static bool InitializeOneOff();
  76
  77   // Unit tests should call these instead of InitializeOneOff() to set up
  78   // GL bindings appropriate for tests.
  79   static void InitializeOneOffForTests();
  80   static void InitializeOneOffWithMockBindingsForTests();
  81   static void InitializeDynamicMockBindingsForTests(GLContext* context);
  82
  83   // Called after a context is made current with this surface. Returns false
  84   // on error.
  85   virtual bool OnMakeCurrent(GLContext* context);
  86
  87   // Used for explicit buffer management.
  88   virtual bool SetBackbufferAllocation(bool allocated);
  89   virtual void SetFrontbufferAllocation(bool allocated);
  90
  91   // Get a handle used to share the surface with another process. Returns null
  92   // if this is not possible.
  93   virtual void* GetShareHandle();
  94
  95   // Get the platform specific display on which this surface resides, if
  96   // available.
  97   virtual void* GetDisplay();
  98
  99   // Get the platfrom specific configuration for this surface, if available.
 100   virtual void* GetConfig();
 101
 102   // Get the GL pixel format of the surface, if available.
 103   virtual unsigned GetFormat();
 104
 105   // Get access to a helper providing time of recent refresh and period
 106   // of screen refresh. If unavailable, returns NULL.
 107   virtual VSyncProvider* GetVSyncProvider();
 108
 109   // Schedule an overlay plane to be shown at swap time.
 110   // |z_order| specifies the stacking order of the plane relative to the
 111   // main framebuffer located at index 0. For the case where there is no
 112   // main framebuffer, overlays may be scheduled at 0, taking its place.
 113   // |transform| specifies how the buffer is to be transformed during
 114   // composition.
 115   // |image| to be presented by the overlay.
 116   // |bounds_rect| specify where it is supposed to be on the screen in pixels.
 117   // |crop_rect| specifies the region within the buffer to be placed inside
 118   // |bounds_rect|.
 119   virtual bool ScheduleOverlayPlane(int z_order,
 120                                     OverlayTransform transform,
 121                                     GLImage* image,
 122                                     const Rect& bounds_rect,
 123                                     const RectF& crop_rect);
 124
 125   virtual bool IsSurfaceless() const;
 126
 127   // Create a GL surface that renders directly to a view.
 128   static scoped_refptr<GLSurface> CreateViewGLSurface(
 129       gfx::AcceleratedWidget window);
 130
 131   // Create a GL surface used for offscreen rendering.
 132   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
 133       const gfx::Size& size);
 134
 135   static GLSurface* GetCurrent();
 136
 137  protected:
 138   virtual ~GLSurface();
 139   static bool InitializeOneOffImplementation(GLImplementation impl,
 140                                              bool fallback_to_osmesa,
 141                                              bool gpu_service_logging,
 142                                              bool disable_gl_drawing);
 143   static bool InitializeOneOffInternal();
 144   static void SetCurrent(GLSurface* surface);
 145
 146   static bool ExtensionsContain(const char* extensions, const char* name);
 147
 148  private:
 149   friend class base::RefCounted<GLSurface>;
 150   friend class GLContext;
 151
 152   DISALLOW_COPY_AND_ASSIGN(GLSurface);
 153 };
 154
 155 // Implementation of GLSurface that forwards all calls through to another
 156 // GLSurface.
 157 class GL_EXPORT GLSurfaceAdapter : public GLSurface {
 158  public:
 159   explicit GLSurfaceAdapter(GLSurface* surface);
 160
 161   bool Initialize() override;
 162   void Destroy() override;
 163   bool Resize(const gfx::Size& size) override;
 164   bool Recreate() override;
 165   bool DeferDraws() override;
 166   bool IsOffscreen() override;
 167   bool SwapBuffers() override;
 168   bool PostSubBuffer(int x, int y, int width, int height) override;
 169   bool SupportsPostSubBuffer() override;
 170   gfx::Size GetSize() override;
 171   void* GetHandle() override;
 172   unsigned int GetBackingFrameBufferObject() override;
 173   bool OnMakeCurrent(GLContext* context) override;
 174   bool SetBackbufferAllocation(bool allocated) override;
 175   void SetFrontbufferAllocation(bool allocated) override;
 176   void* GetShareHandle() override;
 177   void* GetDisplay() override;
 178   void* GetConfig() override;
 179   unsigned GetFormat() override;
 180   VSyncProvider* GetVSyncProvider() override;
 181   bool ScheduleOverlayPlane(int z_order,
 182                             OverlayTransform transform,
 183                             GLImage* image,
 184                             const Rect& bounds_rect,
 185                             const RectF& crop_rect) override;
 186   bool IsSurfaceless() const override;
 187
 188   GLSurface* surface() const { return surface_.get(); }
 189
 190  protected:
 191   ~GLSurfaceAdapter() override;
 192
 193  private:
 194   scoped_refptr<GLSurface> surface_;
 195
 196   DISALLOW_COPY_AND_ASSIGN(GLSurfaceAdapter);
 197 };
 198
 199 }  // namespace gfx
 200
 201 #endif  // UI_GL_GL_SURFACE_H_