src/cobalt/renderer/rasterizer/egl/draw_object_manager.cc - cobalt - Git at Google

 // Copyright 2017 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "cobalt/renderer/rasterizer/egl/draw_object_manager.h"

 #include <algorithm>

 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "cobalt/base/polymorphic_downcast.h"
 #include "cobalt/renderer/backend/egl/utils.h"
 #include "cobalt/renderer/rasterizer/egl/draw_callback.h"

 namespace cobalt {
 namespace renderer {
 namespace rasterizer {
 namespace egl {

 DrawObjectManager::DrawObjectManager(
     const base::Closure& reset_external_rasterizer,
     const base::Closure& flush_external_offscreen_draws)
     : reset_external_rasterizer_(reset_external_rasterizer),
       flush_external_offscreen_draws_(flush_external_offscreen_draws),
       current_draw_id_(0) {}

 uint32_t DrawObjectManager::AddOnscreenDraw(scoped_ptr<DrawObject> draw_object,
     BlendType blend_type, base::TypeId draw_type,
     const backend::RenderTarget* render_target,
     const math::RectF& draw_bounds) {
   onscreen_draws_.push_back(DrawInfo(
       draw_object.Pass(), draw_type, blend_type, render_target,
       draw_bounds, ++current_draw_id_));
   return current_draw_id_;
 }

 uint32_t DrawObjectManager::AddOffscreenDraw(scoped_ptr<DrawObject> draw_object,
     BlendType blend_type, base::TypeId draw_type,
     const backend::RenderTarget* render_target,
     const math::RectF& draw_bounds) {
   // Put all draws using kBlendExternal into their own draw list since they
   // use an external rasterizer which tracks its own state.
   auto* draw_list = &offscreen_draws_;
   if (blend_type == kBlendExternal) {
     draw_list = &external_offscreen_draws_;

     // Only the DrawCallback type should use kBlendExternal. All other draw
     // object types use the native rasterizer.
     DCHECK(base::polymorphic_downcast<DrawCallback*>(draw_object.get()));
   }

   draw_list->push_back(DrawInfo(
       draw_object.Pass(), draw_type, blend_type, render_target,
       draw_bounds, ++current_draw_id_));
   return current_draw_id_;
 }

 void DrawObjectManager::RemoveDraws(uint32_t last_valid_draw_id) {
   TRACE_EVENT0("cobalt::renderer", "RemoveDraws");
   RemoveDraws(&onscreen_draws_, last_valid_draw_id);
   RemoveDraws(&offscreen_draws_, last_valid_draw_id);
   RemoveDraws(&external_offscreen_draws_, last_valid_draw_id);
 }

 void DrawObjectManager::RemoveDraws(std::vector<DrawInfo>* draw_list,
     uint32_t last_valid_draw_id) {
   // Objects in the draw list should have ascending draw IDs at this point.
   auto iter = draw_list->end();
   for (; iter != draw_list->begin(); --iter) {
     if ((iter - 1)->draw_id <= last_valid_draw_id) {
       break;
     }
   }
   if (iter != draw_list->end()) {
     draw_list->erase(iter, draw_list->end());
   }
 }

 void DrawObjectManager::ExecuteOffscreenRasterize(GraphicsState* graphics_state,
     ShaderProgramManager* program_manager) {
   SortOffscreenDraws(&external_offscreen_draws_);

   // Process draws handled by an external rasterizer.
   {
     TRACE_EVENT0("cobalt::renderer", "OffscreenExternalRasterizer");
     for (auto draw = external_offscreen_draws_.begin();
          draw != external_offscreen_draws_.end(); ++draw) {
       draw->draw_object->ExecuteRasterize(graphics_state, program_manager);
     }
     if (!flush_external_offscreen_draws_.is_null()) {
       flush_external_offscreen_draws_.Run();
     }
   }

   SortOffscreenDraws(&offscreen_draws_);
   SortOnscreenDraws(&onscreen_draws_);

   // Update the vertex buffer for all draws.
   {
     TRACE_EVENT0("cobalt::renderer", "UpdateVertexBuffer");
     ExecuteUpdateVertexBuffer(graphics_state, program_manager);
   }

   // Process the native offscreen draws.
   {
     TRACE_EVENT0("cobalt::renderer", "OffscreenNativeRasterizer");
     Rasterize(offscreen_draws_, graphics_state, program_manager);
   }
 }

 void DrawObjectManager::ExecuteUpdateVertexBuffer(
     GraphicsState* graphics_state, ShaderProgramManager* program_manager) {
   for (auto draw = offscreen_draws_.begin(); draw != offscreen_draws_.end();
        ++draw) {
     draw->draw_object->ExecuteUpdateVertexBuffer(
         graphics_state, program_manager);
   }
   for (auto draw = onscreen_draws_.begin(); draw != onscreen_draws_.end();
        ++draw) {
     draw->draw_object->ExecuteUpdateVertexBuffer(
         graphics_state, program_manager);
   }
   graphics_state->UpdateVertexData();
 }

 void DrawObjectManager::ExecuteOnscreenRasterize(GraphicsState* graphics_state,
     ShaderProgramManager* program_manager) {
   Rasterize(onscreen_draws_, graphics_state, program_manager);
 }

 void DrawObjectManager::Rasterize(const std::vector<DrawInfo>& draw_list,
     GraphicsState* graphics_state, ShaderProgramManager* program_manager) {
   const backend::RenderTarget* current_target = nullptr;
   bool using_native_rasterizer = true;

   // Starting from an unknown state.
   graphics_state->SetDirty();

   for (auto draw = draw_list.begin(); draw != draw_list.end(); ++draw) {
     bool draw_uses_native_rasterizer = draw->blend_type != kBlendExternal;

     if (draw_uses_native_rasterizer) {
       if (!using_native_rasterizer) {
         // Transitioning from external to native rasterizer. Set the native
         // rasterizer's state as dirty.
         graphics_state->SetDirty();
       }

       if (draw->render_target != current_target) {
         current_target = draw->render_target;
         graphics_state->BindFramebuffer(current_target);
         graphics_state->Viewport(0, 0,
                                  current_target->GetSize().width(),
                                  current_target->GetSize().height());
       }

       if (draw->blend_type == kBlendNone) {
         graphics_state->DisableBlend();
       } else if (draw->blend_type == kBlendSrcAlpha) {
         graphics_state->EnableBlend();
       } else {
         NOTREACHED() << "Unsupported blend type";
       }
     } else {
       if (using_native_rasterizer) {
         // Transitioning from native to external rasterizer. Set the external
         // rasterizer's state as dirty.
         if (!reset_external_rasterizer_.is_null()) {
           reset_external_rasterizer_.Run();
         }
       }
     }

     draw->draw_object->ExecuteRasterize(graphics_state, program_manager);
     using_native_rasterizer = draw_uses_native_rasterizer;
   }
 }

 void DrawObjectManager::SortOffscreenDraws(std::vector<DrawInfo>* draw_list) {
   TRACE_EVENT0("cobalt::renderer", "SortOffscreenDraws");

   // Sort offscreen draws to minimize GPU state changes.
   for (auto iter = draw_list->begin(); iter != draw_list->end(); ++iter) {
     for (auto current_draw = iter; current_draw != draw_list->begin();
          std::swap(*current_draw, *(current_draw - 1)), current_draw--) {
       auto prev_draw = current_draw - 1;

       // Unlike onscreen draws, offscreen draws should be grouped by
       // render target.
       if (prev_draw->render_target > current_draw->render_target) {
         continue;
       } else if (prev_draw->render_target < current_draw->render_target) {
         break;
       }

       if (prev_draw->draw_bounds.Intersects(current_draw->draw_bounds)) {
         break;
       }

       if (prev_draw->draw_type > current_draw->draw_type) {
         continue;
       } else if (prev_draw->draw_type < current_draw->draw_type) {
         break;
       }

       if (prev_draw->blend_type <= current_draw->blend_type) {
         break;
       }
     }
   }
 }

 void DrawObjectManager::SortOnscreenDraws(std::vector<DrawInfo>* draw_list) {
   TRACE_EVENT0("cobalt::renderer", "SortOnscreenDraws");

   // Sort onscreen draws to minimize GPU state changes.
   for (auto iter = draw_list->begin(); iter != draw_list->end(); ++iter) {
     for (auto current_draw = iter; current_draw != draw_list->begin();
          std::swap(*current_draw, *(current_draw - 1)), current_draw--) {
       auto prev_draw = current_draw - 1;

       // Do not sort across different render targets since their contents may
       // be generated just before consumed by a subsequent draw.
       if (prev_draw->render_target != current_draw->render_target) {
         break;
       }

       if (prev_draw->draw_bounds.Intersects(current_draw->draw_bounds)) {
         break;
       }

       // Group native vs. non-native draws together.
       bool next_uses_same_rasterizer = current_draw + 1 != draw_list->end() &&
           ((current_draw + 1)->blend_type == kBlendExternal) ==
           (current_draw->blend_type == kBlendExternal);
       bool prev_uses_same_rasterizer =
           (prev_draw->blend_type == kBlendExternal) ==
           (current_draw->blend_type == kBlendExternal);
       if (!next_uses_same_rasterizer && !prev_uses_same_rasterizer) {
         continue;
       }
       if (next_uses_same_rasterizer && !prev_uses_same_rasterizer) {
         break;
       }

       if (prev_draw->draw_type > current_draw->draw_type) {
         continue;
       } else if (prev_draw->draw_type < current_draw->draw_type) {
         break;
       }

       if (prev_draw->blend_type <= current_draw->blend_type) {
         break;
       }
     }
   }
 }

 }  // namespace egl
 }  // namespace rasterizer
 }  // namespace renderer
 }  // namespace cobalt
	// Copyright 2017 Google Inc. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "cobalt/renderer/rasterizer/egl/draw_object_manager.h"

	#include <algorithm>

	#include "base/debug/trace_event.h"
	#include "base/logging.h"
	#include "cobalt/base/polymorphic_downcast.h"
	#include "cobalt/renderer/backend/egl/utils.h"
	#include "cobalt/renderer/rasterizer/egl/draw_callback.h"

	namespace cobalt {
	namespace renderer {
	namespace rasterizer {
	namespace egl {

	DrawObjectManager::DrawObjectManager(
	const base::Closure& reset_external_rasterizer,
	const base::Closure& flush_external_offscreen_draws)
	: reset_external_rasterizer_(reset_external_rasterizer),
	flush_external_offscreen_draws_(flush_external_offscreen_draws),
	current_draw_id_(0) {}

	uint32_t DrawObjectManager::AddOnscreenDraw(scoped_ptr<DrawObject> draw_object,
	BlendType blend_type, base::TypeId draw_type,
	const backend::RenderTarget* render_target,
	const math::RectF& draw_bounds) {
	onscreen_draws_.push_back(DrawInfo(
	draw_object.Pass(), draw_type, blend_type, render_target,
	draw_bounds, ++current_draw_id_));
	return current_draw_id_;
	}

	uint32_t DrawObjectManager::AddOffscreenDraw(scoped_ptr<DrawObject> draw_object,
	BlendType blend_type, base::TypeId draw_type,
	const backend::RenderTarget* render_target,
	const math::RectF& draw_bounds) {
	// Put all draws using kBlendExternal into their own draw list since they
	// use an external rasterizer which tracks its own state.
	auto* draw_list = &offscreen_draws_;
	if (blend_type == kBlendExternal) {
	draw_list = &external_offscreen_draws_;

	// Only the DrawCallback type should use kBlendExternal. All other draw
	// object types use the native rasterizer.
	DCHECK(base::polymorphic_downcast<DrawCallback*>(draw_object.get()));
	}

	draw_list->push_back(DrawInfo(
	draw_object.Pass(), draw_type, blend_type, render_target,
	draw_bounds, ++current_draw_id_));
	return current_draw_id_;
	}

	void DrawObjectManager::RemoveDraws(uint32_t last_valid_draw_id) {
	TRACE_EVENT0("cobalt::renderer", "RemoveDraws");
	RemoveDraws(&onscreen_draws_, last_valid_draw_id);
	RemoveDraws(&offscreen_draws_, last_valid_draw_id);
	RemoveDraws(&external_offscreen_draws_, last_valid_draw_id);
	}

	void DrawObjectManager::RemoveDraws(std::vector<DrawInfo>* draw_list,
	uint32_t last_valid_draw_id) {
	// Objects in the draw list should have ascending draw IDs at this point.
	auto iter = draw_list->end();
	for (; iter != draw_list->begin(); --iter) {
	if ((iter - 1)->draw_id <= last_valid_draw_id) {
	break;
	}
	}
	if (iter != draw_list->end()) {
	draw_list->erase(iter, draw_list->end());
	}
	}

	void DrawObjectManager::ExecuteOffscreenRasterize(GraphicsState* graphics_state,
	ShaderProgramManager* program_manager) {
	SortOffscreenDraws(&external_offscreen_draws_);

	// Process draws handled by an external rasterizer.
	{
	TRACE_EVENT0("cobalt::renderer", "OffscreenExternalRasterizer");
	for (auto draw = external_offscreen_draws_.begin();
	draw != external_offscreen_draws_.end(); ++draw) {
	draw->draw_object->ExecuteRasterize(graphics_state, program_manager);
	}
	if (!flush_external_offscreen_draws_.is_null()) {
	flush_external_offscreen_draws_.Run();
	}
	}

	SortOffscreenDraws(&offscreen_draws_);
	SortOnscreenDraws(&onscreen_draws_);

	// Update the vertex buffer for all draws.
	{
	TRACE_EVENT0("cobalt::renderer", "UpdateVertexBuffer");
	ExecuteUpdateVertexBuffer(graphics_state, program_manager);
	}

	// Process the native offscreen draws.
	{
	TRACE_EVENT0("cobalt::renderer", "OffscreenNativeRasterizer");
	Rasterize(offscreen_draws_, graphics_state, program_manager);
	}
	}

	void DrawObjectManager::ExecuteUpdateVertexBuffer(
	GraphicsState* graphics_state, ShaderProgramManager* program_manager) {
	for (auto draw = offscreen_draws_.begin(); draw != offscreen_draws_.end();
	++draw) {
	draw->draw_object->ExecuteUpdateVertexBuffer(
	graphics_state, program_manager);
	}
	for (auto draw = onscreen_draws_.begin(); draw != onscreen_draws_.end();
	++draw) {
	draw->draw_object->ExecuteUpdateVertexBuffer(
	graphics_state, program_manager);
	}
	graphics_state->UpdateVertexData();
	}

	void DrawObjectManager::ExecuteOnscreenRasterize(GraphicsState* graphics_state,
	ShaderProgramManager* program_manager) {
	Rasterize(onscreen_draws_, graphics_state, program_manager);
	}

	void DrawObjectManager::Rasterize(const std::vector<DrawInfo>& draw_list,
	GraphicsState* graphics_state, ShaderProgramManager* program_manager) {
	const backend::RenderTarget* current_target = nullptr;
	bool using_native_rasterizer = true;

	// Starting from an unknown state.
	graphics_state->SetDirty();

	for (auto draw = draw_list.begin(); draw != draw_list.end(); ++draw) {
	bool draw_uses_native_rasterizer = draw->blend_type != kBlendExternal;

	if (draw_uses_native_rasterizer) {
	if (!using_native_rasterizer) {
	// Transitioning from external to native rasterizer. Set the native
	// rasterizer's state as dirty.
	graphics_state->SetDirty();
	}

	if (draw->render_target != current_target) {
	current_target = draw->render_target;
	graphics_state->BindFramebuffer(current_target);
	graphics_state->Viewport(0, 0,
	current_target->GetSize().width(),
	current_target->GetSize().height());
	}

	if (draw->blend_type == kBlendNone) {
	graphics_state->DisableBlend();
	} else if (draw->blend_type == kBlendSrcAlpha) {
	graphics_state->EnableBlend();
	} else {
	NOTREACHED() << "Unsupported blend type";
	}
	} else {
	if (using_native_rasterizer) {
	// Transitioning from native to external rasterizer. Set the external
	// rasterizer's state as dirty.
	if (!reset_external_rasterizer_.is_null()) {
	reset_external_rasterizer_.Run();
	}
	}
	}

	draw->draw_object->ExecuteRasterize(graphics_state, program_manager);
	using_native_rasterizer = draw_uses_native_rasterizer;
	}
	}

	void DrawObjectManager::SortOffscreenDraws(std::vector<DrawInfo>* draw_list) {
	TRACE_EVENT0("cobalt::renderer", "SortOffscreenDraws");

	// Sort offscreen draws to minimize GPU state changes.
	for (auto iter = draw_list->begin(); iter != draw_list->end(); ++iter) {
	for (auto current_draw = iter; current_draw != draw_list->begin();
	std::swap(current_draw, (current_draw - 1)), current_draw--) {
	auto prev_draw = current_draw - 1;

	// Unlike onscreen draws, offscreen draws should be grouped by
	// render target.
	if (prev_draw->render_target > current_draw->render_target) {
	continue;
	} else if (prev_draw->render_target < current_draw->render_target) {
	break;
	}

	if (prev_draw->draw_bounds.Intersects(current_draw->draw_bounds)) {
	break;
	}

	if (prev_draw->draw_type > current_draw->draw_type) {
	continue;
	} else if (prev_draw->draw_type < current_draw->draw_type) {
	break;
	}

	if (prev_draw->blend_type <= current_draw->blend_type) {
	break;
	}
	}
	}
	}

	void DrawObjectManager::SortOnscreenDraws(std::vector<DrawInfo>* draw_list) {
	TRACE_EVENT0("cobalt::renderer", "SortOnscreenDraws");

	// Sort onscreen draws to minimize GPU state changes.
	for (auto iter = draw_list->begin(); iter != draw_list->end(); ++iter) {
	for (auto current_draw = iter; current_draw != draw_list->begin();
	std::swap(current_draw, (current_draw - 1)), current_draw--) {
	auto prev_draw = current_draw - 1;

	// Do not sort across different render targets since their contents may
	// be generated just before consumed by a subsequent draw.
	if (prev_draw->render_target != current_draw->render_target) {
	break;
	}

	if (prev_draw->draw_bounds.Intersects(current_draw->draw_bounds)) {
	break;
	}

	// Group native vs. non-native draws together.
	bool next_uses_same_rasterizer = current_draw + 1 != draw_list->end() &&
	((current_draw + 1)->blend_type == kBlendExternal) ==
	(current_draw->blend_type == kBlendExternal);
	bool prev_uses_same_rasterizer =
	(prev_draw->blend_type == kBlendExternal) ==
	(current_draw->blend_type == kBlendExternal);
	if (!next_uses_same_rasterizer && !prev_uses_same_rasterizer) {
	continue;
	}
	if (next_uses_same_rasterizer && !prev_uses_same_rasterizer) {
	break;
	}

	if (prev_draw->draw_type > current_draw->draw_type) {
	continue;
	} else if (prev_draw->draw_type < current_draw->draw_type) {
	break;
	}

	if (prev_draw->blend_type <= current_draw->blend_type) {
	break;
	}
	}
	}
	}

	} // namespace egl
	} // namespace rasterizer
	} // namespace renderer
	} // namespace cobalt