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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 "radial_gradient_contents.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/entity/geometry/geometry.h"
#include "impeller/geometry/gradient.h"
#include "impeller/renderer/render_pass.h"
namespace impeller {
RadialGradientContents::RadialGradientContents() = default;
RadialGradientContents::~RadialGradientContents() = default;
void RadialGradientContents::SetCenterAndRadius(Point center, Scalar radius) {
center_ = center;
radius_ = radius;
}
void RadialGradientContents::SetTileMode(Entity::TileMode tile_mode) {
tile_mode_ = tile_mode;
}
void RadialGradientContents::SetColors(std::vector<Color> colors) {
colors_ = std::move(colors);
}
void RadialGradientContents::SetStops(std::vector<Scalar> stops) {
stops_ = std::move(stops);
}
const std::vector<Color>& RadialGradientContents::GetColors() const {
return colors_;
}
const std::vector<Scalar>& RadialGradientContents::GetStops() const {
return stops_;
}
bool RadialGradientContents::IsOpaque() const {
if (GetOpacityFactor() < 1 || tile_mode_ == Entity::TileMode::kDecal) {
return false;
}
for (auto color : colors_) {
if (!color.IsOpaque()) {
return false;
}
}
return true;
}
bool RadialGradientContents::Render(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
if (renderer.GetDeviceCapabilities().SupportsSSBO()) {
return RenderSSBO(renderer, entity, pass);
}
return RenderTexture(renderer, entity, pass);
}
bool RadialGradientContents::RenderSSBO(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = RadialGradientSSBOFillPipeline::VertexShader;
using FS = RadialGradientSSBOFillPipeline::FragmentShader;
FS::FragInfo frag_info;
frag_info.center = center_;
frag_info.radius = radius_;
frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
frag_info.decal_border_color = decal_border_color_;
frag_info.alpha = GetOpacityFactor();
auto& host_buffer = renderer.GetTransientsBuffer();
auto colors = CreateGradientColors(colors_, stops_);
frag_info.colors_length = colors.size();
auto color_buffer =
host_buffer.Emplace(colors.data(), colors.size() * sizeof(StopData),
DefaultUniformAlignment());
VS::FrameInfo frame_info;
frame_info.mvp = pass.GetOrthographicTransform() * entity.GetTransform();
frame_info.matrix = GetInverseEffectTransform();
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;
pass.SetCommandLabel("RadialGradientSSBOFill");
pass.SetPipeline(renderer.GetRadialGradientSSBOFillPipeline(options));
pass.SetStencilReference(entity.GetClipDepth());
pass.SetVertexBuffer(std::move(geometry_result.vertex_buffer));
FS::BindFragInfo(pass,
renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
FS::BindColorData(pass, color_buffer);
VS::BindFrameInfo(pass,
renderer.GetTransientsBuffer().EmplaceUniform(frame_info));
if (!pass.Draw().ok()) {
return false;
}
if (geometry_result.prevent_overdraw) {
auto restore = ClipRestoreContents();
restore.SetRestoreCoverage(GetCoverage(entity));
return restore.Render(renderer, entity, pass);
}
return true;
}
bool RadialGradientContents::RenderTexture(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = RadialGradientFillPipeline::VertexShader;
using FS = RadialGradientFillPipeline::FragmentShader;
auto gradient_data = CreateGradientBuffer(colors_, stops_);
auto gradient_texture =
CreateGradientTexture(gradient_data, renderer.GetContext());
if (gradient_texture == nullptr) {
return false;
}
FS::FragInfo frag_info;
frag_info.center = center_;
frag_info.radius = radius_;
frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
frag_info.decal_border_color = decal_border_color_;
frag_info.texture_sampler_y_coord_scale = gradient_texture->GetYCoordScale();
frag_info.alpha = GetOpacityFactor();
frag_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 = GetInverseEffectTransform();
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;
SamplerDescriptor sampler_desc;
sampler_desc.min_filter = MinMagFilter::kLinear;
sampler_desc.mag_filter = MinMagFilter::kLinear;
pass.SetCommandLabel("RadialGradientFill");
pass.SetPipeline(renderer.GetRadialGradientFillPipeline(options));
pass.SetStencilReference(entity.GetClipDepth());
pass.SetVertexBuffer(std::move(geometry_result.vertex_buffer));
FS::BindFragInfo(pass,
renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
FS::BindTextureSampler(
pass, gradient_texture,
renderer.GetContext()->GetSamplerLibrary()->GetSampler(sampler_desc));
VS::BindFrameInfo(pass,
renderer.GetTransientsBuffer().EmplaceUniform(frame_info));
if (!pass.Draw().ok()) {
return false;
}
if (geometry_result.prevent_overdraw) {
auto restore = ClipRestoreContents();
restore.SetRestoreCoverage(GetCoverage(entity));
return restore.Render(renderer, entity, pass);
}
return true;
}
bool RadialGradientContents::ApplyColorFilter(
const ColorFilterProc& color_filter_proc) {
for (Color& color : colors_) {
color = color_filter_proc(color);
}
decal_border_color_ = color_filter_proc(decal_border_color_);
return true;
}
} // namespace impeller