Add a sample app that draws with Ganesh

examples/ganesh_app/painter.cc

Index: examples/ganesh_app/painter.cc
diff --git a/examples/surfaces_app/child_gl_impl.cc b/examples/ganesh_app/painter.cc
similarity index 57%
copy from examples/surfaces_app/child_gl_impl.cc
copy to examples/ganesh_app/painter.cc
index 4f91f3d9b7c44d8ad2ad721755458ba41148ebc3..941e3245b92920b91f68fc74f1a9398ced95e702 100644
--- a/examples/surfaces_app/child_gl_impl.cc
+++ b/examples/ganesh_app/painter.cc
@@ -2,13 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "examples/surfaces_app/child_gl_impl.h"
+#include "examples/ganesh_app/painter.h"
 
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES
 #endif
 
 #include "base/bind.h"
+#include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/delegated_frame_data.h"
@@ -17,22 +18,26 @@
 #include "examples/surfaces_app/surfaces_util.h"
 #include "gpu/GLES2/gl2chromium.h"
 #include "gpu/GLES2/gl2extchromium.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/client/gles2_lib.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "gpu/command_buffer/common/mailbox_holder.h"
+#include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
+#include "mojo/public/c/gles2/gles2.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/services/public/interfaces/surfaces/surface_id.mojom.h"
 #include "mojo/services/public/interfaces/surfaces/surfaces.mojom.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkSurface.h"
+#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
 
-namespace mojo {
-namespace examples {
-
 using cc::RenderPass;
 using cc::RenderPassId;
 using cc::DrawQuad;
@@ -40,54 +45,79 @@ using cc::TextureDrawQuad;
 using cc::DelegatedFrameData;
 using cc::CompositorFrame;
 
+namespace mojo {
+namespace examples {
+namespace {
+
+// The limit of the number of GPU resources we hold in the GrContext's
+// GPU cache.
+const int kMaxGaneshResourceCacheCount = 2048;
+
+// The limit of the bytes allocated toward GPU resources in the GrContext's
+// GPU cache.
+const size_t kMaxGaneshResourceCacheBytes = 96 * 1024 * 1024;
+
+}
+
 static void ContextLostThunk(void*) {
   LOG(FATAL) << "Context lost";
 }
 
-ChildGLImpl::ChildGLImpl(ApplicationConnection* surfaces_service_connection,
-                         CommandBufferPtr command_buffer)
-    : start_time_(base::TimeTicks::Now()),
-      next_resource_id_(1),
+Painter::Painter(ApplicationConnection* surfaces_service_connection,
+                 CommandBufferPtr command_buffer)
+    : next_resource_id_(0),
       weak_factory_(this) {
   surfaces_service_connection->ConnectToService(&surfaces_service_);
   surfaces_service_->CreateSurfaceConnection(base::Bind(
-      &ChildGLImpl::SurfaceConnectionCreated, weak_factory_.GetWeakPtr()));
+      &Painter::SurfaceConnectionCreated, weak_factory_.GetWeakPtr()));
   context_ =
       MojoGLES2CreateContext(command_buffer.PassMessagePipe().release().value(),
                              &ContextLostThunk,
                              this,
-                             Environment::GetDefaultAsyncWaiter());
+                             mojo::Environment::GetDefaultAsyncWaiter());
   DCHECK(context_);
   MojoGLES2MakeCurrent(context_);
+
+  gpu::gles2::GLES2Interface* gl = static_cast<gpu::gles2::GLES2Interface*>(
+      MojoGLES2GetGLES2Interface(context_));
+  gles2::SetGLContext(gl);
+
+  skia::RefPtr<GrGLInterface> interface = skia::AdoptRef(
+      skia_bindings::CreateCommandBufferSkiaGLBinding());
+  DCHECK(interface);
+
+  gr_context_ = skia::AdoptRef(GrContext::Create(
+      kOpenGL_GrBackend,
+      reinterpret_cast<GrBackendContext>(interface.get())));
+  DCHECK(gr_context_);
+  gr_context_->setResourceCacheLimits(kMaxGaneshResourceCacheCount,
+                                      kMaxGaneshResourceCacheBytes);
 }
 
-ChildGLImpl::~ChildGLImpl() {
+Painter::~Painter() {
   MojoGLES2DestroyContext(context_);
   surface_->DestroySurface(mojo::SurfaceId::From(id_));
 }
 
-void ChildGLImpl::ProduceFrame(
+void Painter::ProduceFrame(
     ColorPtr color,
     SizePtr size,
     const mojo::Callback<void(SurfaceIdPtr id)>& callback) {
-  color_ = color.To<SkColor>();
+
   size_ = size.To<gfx::Size>();
-  cube_.Init(size_.width(), size_.height());
-  cube_.set_color(
-      SkColorGetR(color_), SkColorGetG(color_), SkColorGetB(color_));
   produce_callback_ = callback;
   AllocateSurface();
 }
 
-void ChildGLImpl::SurfaceConnectionCreated(SurfacePtr surface,
-                                           uint32_t id_namespace) {
+void Painter::SurfaceConnectionCreated(SurfacePtr surface,
+                                       uint32_t id_namespace) {
   surface_ = surface.Pass();
   surface_.set_client(this);
   allocator_.reset(new cc::SurfaceIdAllocator(id_namespace));
   AllocateSurface();
 }
 
-void ChildGLImpl::ReturnResources(Array<ReturnedResourcePtr> resources) {
+void Painter::ReturnResources(Array<ReturnedResourcePtr> resources) {
   for (size_t i = 0; i < resources.size(); ++i) {
     cc::ReturnedResource res = resources[i].To<cc::ReturnedResource>();
     GLuint returned_texture = id_to_tex_map_[res.id];
@@ -95,7 +125,7 @@ void ChildGLImpl::ReturnResources(Array<ReturnedResourcePtr> resources) {
   }
 }
 
-void ChildGLImpl::AllocateSurface() {
+void Painter::AllocateSurface() {
   if (produce_callback_.is_null() || !allocator_)
     return;
 
@@ -105,31 +135,42 @@ void ChildGLImpl::AllocateSurface() {
   Draw();
 }
 
-void ChildGLImpl::Draw() {
-  // First, generate a GL texture and draw the cube into it.
-  GLuint texture = 0u;
-  glGenTextures(1, &texture);
-  glBindTexture(GL_TEXTURE_2D, texture);
-  glTexImage2D(GL_TEXTURE_2D,
-               0,
-               GL_RGBA,
-               size_.width(),
-               size_.height(),
-               0,
-               GL_RGBA,
-               GL_UNSIGNED_BYTE,
-               0);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-  GLuint fbo = 0u;
-  glGenFramebuffers(1, &fbo);
-  glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-  glFramebufferTexture2D(
-      GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
-  DCHECK_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
-            glCheckFramebufferStatus(GL_FRAMEBUFFER));
-  glClearColor(1, 0, 0, 0.5);
-  cube_.UpdateForTimeDelta(0.16f);
-  cube_.Draw();
+void Painter::Draw() {
+  gpu::gles2::GLES2Interface* gl = static_cast<gpu::gles2::GLES2Interface*>(
+      MojoGLES2GetGLES2Interface(context_));
+
+  GLuint texture_id = 0u;
+  gl->GenTextures(1, &texture_id);
+  gl->BindTexture(GL_TEXTURE_2D, texture_id);
+  gl->TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size_.width(), size_.height(),
+                 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+  gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+  GrBackendTextureDesc desc;
+  desc.fFlags = kRenderTarget_GrBackendTextureFlag;
+  desc.fWidth = size_.width();
+  desc.fHeight = size_.height();
+  desc.fConfig = kSkia8888_GrPixelConfig;
+  desc.fOrigin = kTopLeft_GrSurfaceOrigin;
+  desc.fTextureHandle = texture_id;
+  skia::RefPtr<GrTexture> texture = skia::AdoptRef(
+      gr_context_->wrapBackendTexture(desc));
+
+  DCHECK(texture) << "No texture";
+  DCHECK(texture->asRenderTarget()) << "No render target";
+
+  skia::RefPtr<SkSurface> sk_surface = skia::AdoptRef(
+      SkSurface::NewRenderTargetDirect(texture->asRenderTarget()));
+
+  DCHECK(sk_surface);
+
+  SkCanvas* canvas = sk_surface->getCanvas();
+
+  SkPaint paint;
+  paint.setColor(SK_ColorRED);
+  paint.setFlags(SkPaint::kAntiAlias_Flag);
+  canvas->drawCircle(size_.width() / 2, 0, 100, paint);
+  canvas->flush();
 
   // Then, put the texture into a mailbox.
   gpu::Mailbox mailbox = gpu::Mailbox::Generate();
@@ -140,7 +181,7 @@ void ChildGLImpl::Draw() {
   // Then, put the mailbox into a TransferableResource
   cc::TransferableResource resource;
   resource.id = next_resource_id_++;
-  id_to_tex_map_[resource.id] = texture;
+  id_to_tex_map_[resource.id] = texture_id;
   resource.format = cc::RGBA_8888;
   resource.filter = GL_LINEAR;
   resource.size = size_;
@@ -149,7 +190,7 @@ void ChildGLImpl::Draw() {
   resource.is_software = false;
 
   gfx::Rect rect(size_);
-  RenderPassId id(1, 1);
+  cc::RenderPassId id(1, 1);
   scoped_ptr<RenderPass> pass = RenderPass::Create();
   pass->SetNew(id, rect, rect, gfx::Transform());
 
@@ -157,7 +198,7 @@ void ChildGLImpl::Draw() {
 
   TextureDrawQuad* texture_quad =
       pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
-  float vertex_opacity[4] = {1.0f, 1.0f, 0.2f, 1.0f};
+  float vertex_opacity[4] = {1.0f, 1.0f, 1.0f, 1.0f};
   texture_quad->SetNew(pass->shared_quad_state_list.back(),
                        rect,
                        rect,
@@ -181,7 +222,7 @@ void ChildGLImpl::Draw() {
 
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
-      base::Bind(&ChildGLImpl::Draw, base::Unretained(this)),
+      base::Bind(&Painter::Draw, weak_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(50));
 }