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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "linear_gradient_contents.h"
#include "flutter/fml/logging.h"
#include "impeller/entity/contents/clip_contents.h"
#include "impeller/entity/contents/content_context.h"
#include "impeller/entity/contents/gradient_generator.h"
#include "impeller/entity/entity.h"
#include "impeller/renderer/formats.h"
#include "impeller/renderer/render_pass.h"
#include "impeller/renderer/sampler_library.h"
namespace impeller {
LinearGradientContents::LinearGradientContents() = default;
LinearGradientContents::~LinearGradientContents() = default;
void LinearGradientContents::SetEndPoints(Point start_point, Point end_point) {
start_point_ = start_point;
end_point_ = end_point;
}
void LinearGradientContents::SetColors(std::vector<Color> colors) {
colors_ = std::move(colors);
}
void LinearGradientContents::SetStops(std::vector<Scalar> stops) {
stops_ = std::move(stops);
}
const std::vector<Color>& LinearGradientContents::GetColors() const {
return colors_;
}
const std::vector<Scalar>& LinearGradientContents::GetStops() const {
return stops_;
}
void LinearGradientContents::SetTileMode(Entity::TileMode tile_mode) {
tile_mode_ = tile_mode;
}
bool LinearGradientContents::Render(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
if (renderer.GetBackendFeatures().ssbo_support) {
return RenderSSBO(renderer, entity, pass);
}
return RenderTexture(renderer, entity, pass);
}
bool LinearGradientContents::RenderTexture(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = LinearGradientFillPipeline::VertexShader;
using FS = LinearGradientFillPipeline::FragmentShader;
auto gradient_data = CreateGradientBuffer(colors_, stops_);
auto gradient_texture =
CreateGradientTexture(gradient_data, renderer.GetContext());
if (gradient_texture == nullptr) {
return false;
}
FS::GradientInfo gradient_info;
gradient_info.start_point = start_point_;
gradient_info.end_point = end_point_;
gradient_info.tile_mode = static_cast<Scalar>(tile_mode_);
gradient_info.texture_sampler_y_coord_scale =
gradient_texture->GetYCoordScale();
gradient_info.alpha = GetAlpha();
gradient_info.half_texel = Vector2(0.5 / gradient_texture->GetSize().width,
0.5 / gradient_texture->GetSize().height);
auto geometry_result =
GetGeometry()->GetPositionBuffer(renderer, entity, pass);
VS::FrameInfo frame_info;
frame_info.mvp = geometry_result.transform;
frame_info.matrix = GetInverseMatrix();
Command cmd;
cmd.label = "LinearGradientFill";
cmd.stencil_reference = entity.GetStencilDepth();
auto options = OptionsFromPassAndEntity(pass, entity);
if (geometry_result.prevent_overdraw) {
options.stencil_compare = CompareFunction::kEqual;
options.stencil_operation = StencilOperation::kIncrementClamp;
}
options.primitive_type = geometry_result.type;
cmd.pipeline = renderer.GetLinearGradientFillPipeline(options);
cmd.BindVertices(geometry_result.vertex_buffer);
FS::BindGradientInfo(
cmd, pass.GetTransientsBuffer().EmplaceUniform(gradient_info));
SamplerDescriptor sampler_desc;
sampler_desc.min_filter = MinMagFilter::kLinear;
sampler_desc.mag_filter = MinMagFilter::kLinear;
FS::BindTextureSampler(
cmd, std::move(gradient_texture),
renderer.GetContext()->GetSamplerLibrary()->GetSampler(sampler_desc));
VS::BindFrameInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frame_info));
if (!pass.AddCommand(std::move(cmd))) {
return false;
}
if (geometry_result.prevent_overdraw) {
return ClipRestoreContents().Render(renderer, entity, pass);
}
return true;
}
bool LinearGradientContents::RenderSSBO(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = LinearGradientSSBOFillPipeline::VertexShader;
using FS = LinearGradientSSBOFillPipeline::FragmentShader;
FS::GradientInfo gradient_info;
gradient_info.start_point = start_point_;
gradient_info.end_point = end_point_;
gradient_info.tile_mode = static_cast<Scalar>(tile_mode_);
gradient_info.alpha = GetAlpha();
auto& host_buffer = pass.GetTransientsBuffer();
auto colors = CreateGradientColors(colors_, stops_).value_or(colors_);
gradient_info.colors_length = colors.size();
auto color_buffer = host_buffer.Emplace(
colors.data(), colors.size() * sizeof(Color), alignof(Color));
VS::FrameInfo frame_info;
frame_info.mvp = Matrix::MakeOrthographic(pass.GetRenderTargetSize()) *
entity.GetTransformation();
frame_info.matrix = GetInverseMatrix();
Command cmd;
cmd.label = "LinearGradientSSBOFill";
cmd.stencil_reference = entity.GetStencilDepth();
auto geometry_result =
GetGeometry()->GetPositionBuffer(renderer, entity, pass);
auto options = OptionsFromPassAndEntity(pass, entity);
if (geometry_result.prevent_overdraw) {
options.stencil_compare = CompareFunction::kEqual;
options.stencil_operation = StencilOperation::kIncrementClamp;
}
options.primitive_type = geometry_result.type;
cmd.pipeline = renderer.GetLinearGradientSSBOFillPipeline(options);
cmd.BindVertices(geometry_result.vertex_buffer);
FS::BindGradientInfo(
cmd, pass.GetTransientsBuffer().EmplaceUniform(gradient_info));
FS::BindColorData(cmd, color_buffer);
VS::BindFrameInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frame_info));
if (!pass.AddCommand(std::move(cmd))) {
return false;
}
if (geometry_result.prevent_overdraw) {
return ClipRestoreContents().Render(renderer, entity, pass);
}
return true;
}
} // namespace impeller