1 // Copyright 2014 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.
5 #include "android_webview/browser/hardware_renderer.h"
7 #include "android_webview/browser/aw_gl_surface.h"
8 #include "android_webview/browser/deferred_gpu_command_service.h"
9 #include "android_webview/browser/parent_output_surface.h"
10 #include "android_webview/browser/shared_renderer_state.h"
11 #include "android_webview/public/browser/draw_gl.h"
12 #include "base/auto_reset.h"
13 #include "base/debug/trace_event.h"
14 #include "base/strings/string_number_conversions.h"
15 #include "cc/layers/delegated_frame_provider.h"
16 #include "cc/layers/delegated_renderer_layer.h"
17 #include "cc/layers/layer.h"
18 #include "cc/output/compositor_frame.h"
19 #include "cc/output/output_surface.h"
20 #include "cc/trees/layer_tree_host.h"
21 #include "cc/trees/layer_tree_settings.h"
22 #include "gpu/command_buffer/client/gl_in_process_context.h"
23 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
24 #include "ui/gfx/frame_time.h"
25 #include "ui/gfx/geometry/rect_conversions.h"
26 #include "ui/gfx/geometry/rect_f.h"
27 #include "ui/gfx/transform.h"
28 #include "ui/gl/gl_bindings.h"
29 #include "webkit/common/gpu/context_provider_in_process.h"
30 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
32 namespace android_webview {
36 using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
37 using webkit::gpu::WebGraphicsContext3DImpl;
39 scoped_refptr<cc::ContextProvider> CreateContext(
40 scoped_refptr<gfx::GLSurface> surface,
41 scoped_refptr<gpu::InProcessCommandBuffer::Service> service,
42 gpu::GLInProcessContext* share_context) {
43 const gfx::GpuPreference gpu_preference = gfx::PreferDiscreteGpu;
45 blink::WebGraphicsContext3D::Attributes attributes;
46 attributes.antialias = false;
47 attributes.depth = false;
48 attributes.stencil = false;
49 attributes.shareResources = true;
50 attributes.noAutomaticFlushes = true;
51 gpu::gles2::ContextCreationAttribHelper attribs_for_gles2;
52 WebGraphicsContext3DImpl::ConvertAttributes(
53 attributes, &attribs_for_gles2);
54 attribs_for_gles2.lose_context_when_out_of_memory = true;
56 scoped_ptr<gpu::GLInProcessContext> context(gpu::GLInProcessContext::Create(
59 surface->IsOffscreen(),
60 gfx::kNullAcceleratedWidget,
63 false /* share_resources */,
66 gpu::GLInProcessContextSharedMemoryLimits()));
67 DCHECK(context.get());
69 return webkit::gpu::ContextProviderInProcess::Create(
70 WebGraphicsContext3DInProcessCommandBufferImpl::WrapContext(
71 context.Pass(), attributes),
77 HardwareRenderer::HardwareRenderer(SharedRendererState* state)
78 : shared_renderer_state_(state),
79 last_egl_context_(eglGetCurrentContext()),
80 stencil_enabled_(false),
81 viewport_clip_valid_for_dcheck_(false),
82 gl_surface_(new AwGLSurface),
83 root_layer_(cc::Layer::Create()),
84 resource_collection_(new cc::DelegatedFrameResourceCollection),
85 output_surface_(NULL) {
86 DCHECK(last_egl_context_);
88 resource_collection_->SetClient(this);
90 cc::LayerTreeSettings settings;
92 // Should be kept in sync with compositor_impl_android.cc.
93 settings.allow_antialiasing = false;
94 settings.highp_threshold_min = 2048;
96 // Webview does not own the surface so should not clear it.
97 settings.should_clear_root_render_pass = false;
100 cc::LayerTreeHost::CreateSingleThreaded(this, this, NULL, settings, NULL);
101 layer_tree_host_->SetRootLayer(root_layer_);
102 layer_tree_host_->SetLayerTreeHostClientReady();
103 layer_tree_host_->set_has_transparent_background(true);
106 HardwareRenderer::~HardwareRenderer() {
107 // Must reset everything before |resource_collection_| to ensure all
108 // resources are returned before resetting |resource_collection_| client.
109 layer_tree_host_.reset();
111 delegated_layer_ = NULL;
112 frame_provider_ = NULL;
114 // Check collection is empty.
115 cc::ReturnedResourceArray returned_resources;
116 resource_collection_->TakeUnusedResourcesForChildCompositor(
117 &returned_resources);
118 DCHECK_EQ(0u, returned_resources.size());
119 #endif // DCHECK_IS_ON
121 resource_collection_->SetClient(NULL);
123 // Reset draw constraints.
124 shared_renderer_state_->UpdateDrawConstraints(
125 ParentCompositorDrawConstraints());
128 void HardwareRenderer::DidBeginMainFrame() {
129 // This is called after OutputSurface is created, but before the impl frame
130 // starts. We set the draw constraints here.
131 DCHECK(output_surface_);
132 DCHECK(viewport_clip_valid_for_dcheck_);
133 output_surface_->SetExternalStencilTest(stencil_enabled_);
134 output_surface_->SetDrawConstraints(viewport_, clip_);
137 void HardwareRenderer::CommitFrame() {
138 scoped_ptr<DrawGLInput> input = shared_renderer_state_->PassDrawGLInput();
139 // Happens with empty global visible rect.
143 DCHECK(!input->frame.gl_frame_data);
144 DCHECK(!input->frame.software_frame_data);
146 // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
147 // renderer frame, assuming that the browser compositor will scale
148 // it back up to device scale. But on Android we put our browser layers in
149 // physical pixels and set our browser CC device_scale_factor to 1, so this
150 // suppresses the transform.
151 input->frame.delegated_frame_data->device_scale_factor = 1.0f;
153 gfx::Size frame_size =
154 input->frame.delegated_frame_data->render_pass_list.back()
155 ->output_rect.size();
156 bool size_changed = frame_size != frame_size_;
157 frame_size_ = frame_size;
158 scroll_offset_ = input->scroll_offset;
160 if (!frame_provider_ || size_changed) {
161 if (delegated_layer_) {
162 delegated_layer_->RemoveFromParent();
165 frame_provider_ = new cc::DelegatedFrameProvider(
166 resource_collection_.get(), input->frame.delegated_frame_data.Pass());
168 delegated_layer_ = cc::DelegatedRendererLayer::Create(frame_provider_);
169 delegated_layer_->SetBounds(gfx::Size(input->width, input->height));
170 delegated_layer_->SetIsDrawable(true);
172 root_layer_->AddChild(delegated_layer_);
174 frame_provider_->SetFrameData(input->frame.delegated_frame_data.Pass());
178 void HardwareRenderer::DrawGL(bool stencil_enabled,
179 int framebuffer_binding_ext,
180 AwDrawGLInfo* draw_info) {
181 TRACE_EVENT0("android_webview", "HardwareRenderer::DrawGL");
183 // We need to watch if the current Android context has changed and enforce
184 // a clean-up in the compositor.
185 EGLContext current_context = eglGetCurrentContext();
186 if (!current_context) {
187 DLOG(ERROR) << "DrawGL called without EGLContext";
191 // TODO(boliu): Handle context loss.
192 if (last_egl_context_ != current_context)
193 DLOG(WARNING) << "EGLContextChanged";
195 gfx::Transform transform(gfx::Transform::kSkipInitialization);
196 transform.matrix().setColMajorf(draw_info->transform);
197 transform.Translate(scroll_offset_.x(), scroll_offset_.y());
199 // Need to post the new transform matrix back to child compositor
200 // because there is no onDraw during a Render Thread animation, and child
201 // compositor might not have the tiles rasterized as the animation goes on.
202 ParentCompositorDrawConstraints draw_constraints(
203 draw_info->is_layer, transform, gfx::Rect(viewport_));
205 draw_constraints_ = draw_constraints;
206 shared_renderer_state_->PostExternalDrawConstraintsToChildCompositor(
209 if (!delegated_layer_.get())
212 viewport_.SetSize(draw_info->width, draw_info->height);
213 layer_tree_host_->SetViewportSize(viewport_);
214 clip_.SetRect(draw_info->clip_left,
216 draw_info->clip_right - draw_info->clip_left,
217 draw_info->clip_bottom - draw_info->clip_top);
218 stencil_enabled_ = stencil_enabled;
220 delegated_layer_->SetTransform(transform);
222 gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
224 base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
226 layer_tree_host_->SetNeedsRedrawRect(clip_);
227 layer_tree_host_->Composite(gfx::FrameTime::Now());
229 gl_surface_->ResetBackingFrameBufferObject();
232 scoped_ptr<cc::OutputSurface> HardwareRenderer::CreateOutputSurface(
234 // Android webview does not support losing output surface.
236 scoped_refptr<cc::ContextProvider> context_provider =
237 CreateContext(gl_surface_,
238 DeferredGpuCommandService::GetInstance(),
239 shared_renderer_state_->GetSharedContext());
240 scoped_ptr<ParentOutputSurface> output_surface_holder(
241 new ParentOutputSurface(context_provider));
242 output_surface_ = output_surface_holder.get();
243 return output_surface_holder.PassAs<cc::OutputSurface>();
246 void HardwareRenderer::UnusedResourcesAreAvailable() {
247 cc::ReturnedResourceArray returned_resources;
248 resource_collection_->TakeUnusedResourcesForChildCompositor(
249 &returned_resources);
250 shared_renderer_state_->InsertReturnedResources(returned_resources);
253 } // namespace android_webview