cc/output/direct_renderer.h

   1 // Copyright 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 CC_OUTPUT_DIRECT_RENDERER_H_
   6 #define CC_OUTPUT_DIRECT_RENDERER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "cc/base/cc_export.h"
  11 #include "cc/output/renderer.h"
  12 #include "cc/resources/resource_provider.h"
  13 #include "cc/resources/scoped_resource.h"
  14
  15 namespace cc {
  16
  17 class ResourceProvider;
  18
  19 // This is the base class for code shared between the GL and software
  20 // renderer implementations.  "Direct" refers to the fact that it does not
  21 // delegate rendering to another compositor.
  22 class CC_EXPORT DirectRenderer : public Renderer {
  23  public:
  24   virtual ~DirectRenderer();
  25
  26   ResourceProvider* resource_provider() const { return resource_provider_; }
  27
  28   virtual bool CanReadPixels() const OVERRIDE;
  29   virtual void DecideRenderPassAllocationsForFrame(
  30       const RenderPassList& render_passes_in_draw_order) OVERRIDE;
  31   virtual bool HaveCachedResourcesForRenderPassId(RenderPass::Id id) const
  32       OVERRIDE;
  33   virtual void DrawFrame(RenderPassList* render_passes_in_draw_order) OVERRIDE;
  34
  35   struct CC_EXPORT DrawingFrame {
  36     DrawingFrame();
  37     ~DrawingFrame();
  38
  39     const RenderPass* root_render_pass;
  40     const RenderPass* current_render_pass;
  41     const ScopedResource* current_texture;
  42
  43     gfx::RectF root_damage_rect;
  44
  45     gfx::Transform projection_matrix;
  46     gfx::Transform window_matrix;
  47   };
  48
  49   void SetEnlargePassTextureAmountForTesting(gfx::Vector2d amount);
  50
  51  protected:
  52   DirectRenderer(RendererClient* client,
  53                  OutputSurface* output_surface,
  54                  ResourceProvider* resource_provider);
  55
  56   class CachedResource : public ScopedResource {
  57    public:
  58     static scoped_ptr<CachedResource> Create(
  59         ResourceProvider* resource_provider) {
  60       return make_scoped_ptr(new CachedResource(resource_provider));
  61     }
  62     virtual ~CachedResource() {}
  63
  64     bool is_complete() const { return is_complete_; }
  65     void set_is_complete(bool is_complete) { is_complete_ = is_complete; }
  66
  67    protected:
  68     explicit CachedResource(ResourceProvider* resource_provider)
  69         : ScopedResource(resource_provider),
  70           is_complete_(false) {}
  71
  72    private:
  73     bool is_complete_;
  74
  75     DISALLOW_COPY_AND_ASSIGN(CachedResource);
  76   };
  77
  78   static gfx::RectF QuadVertexRect();
  79   static void QuadRectTransform(gfx::Transform* quad_rect_transform,
  80                                 const gfx::Transform& quad_transform,
  81                                 const gfx::RectF& quad_rect);
  82   void InitializeViewport(DrawingFrame* frame,
  83                           gfx::Rect draw_rect,
  84                           gfx::Rect viewport_rect,
  85                           gfx::Size surface_size);
  86   gfx::Rect MoveFromDrawToWindowSpace(const gfx::RectF& draw_rect) const;
  87
  88   static gfx::RectF ComputeScissorRectForRenderPass(const DrawingFrame* frame);
  89   void SetScissorStateForQuad(const DrawingFrame* frame, const DrawQuad& quad);
  90   void SetScissorStateForQuadWithRenderPassScissor(
  91       const DrawingFrame* frame,
  92       const DrawQuad& quad,
  93       const gfx::RectF& render_pass_scissor,
  94       bool* should_skip_quad);
  95
  96   static gfx::Size RenderPassTextureSize(const RenderPass* render_pass);
  97   static GLenum RenderPassTextureFormat(const RenderPass* render_pass);
  98
  99   void DrawRenderPass(DrawingFrame* frame, const RenderPass* render_pass);
 100   bool UseRenderPass(DrawingFrame* frame, const RenderPass* render_pass);
 101
 102   virtual void BindFramebufferToOutputSurface(DrawingFrame* frame) = 0;
 103   virtual bool BindFramebufferToTexture(DrawingFrame* frame,
 104                                         const ScopedResource* resource,
 105                                         gfx::Rect target_rect) = 0;
 106   virtual void SetDrawViewport(gfx::Rect window_space_viewport) = 0;
 107   virtual void SetScissorTestRect(gfx::Rect scissor_rect) = 0;
 108   virtual void ClearFramebuffer(DrawingFrame* frame) = 0;
 109   virtual void DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) = 0;
 110   virtual void BeginDrawingFrame(DrawingFrame* frame) = 0;
 111   virtual void FinishDrawingFrame(DrawingFrame* frame) = 0;
 112   virtual void FinishDrawingQuadList();
 113   virtual bool FlippedFramebuffer() const = 0;
 114   virtual void EnsureScissorTestEnabled() = 0;
 115   virtual void EnsureScissorTestDisabled() = 0;
 116   virtual void DiscardBackbuffer() {}
 117   virtual void EnsureBackbuffer() {}
 118
 119   virtual void CopyCurrentRenderPassToBitmap(
 120       DrawingFrame* frame,
 121       scoped_ptr<CopyOutputRequest> request) = 0;
 122
 123   ScopedPtrHashMap<RenderPass::Id, CachedResource> render_pass_textures_;
 124   OutputSurface* output_surface_;
 125   ResourceProvider* resource_provider_;
 126
 127   // For use in coordinate conversion, this stores the output rect, viewport
 128   // rect (= unflipped version of glViewport rect), and the size of target
 129   // framebuffer. During a draw, this stores the values for the current render
 130   // pass; in between draws, they retain the values for the root render pass of
 131   // the last draw.
 132   gfx::Rect current_draw_rect_;
 133   gfx::Rect current_viewport_rect_;
 134   gfx::Size current_surface_size_;
 135
 136  private:
 137   gfx::Vector2d enlarge_pass_texture_amount_;
 138
 139   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 140 };
 141
 142 }  // namespace cc
 143
 144 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_