blob: a70ff716d009240a994aa47d2a3a7d03ece38e37 [file] [log] [blame]
// 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 "sweep_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/geometry/gradient.h"
#include "impeller/renderer/render_pass.h"
#include "impeller/renderer/sampler_library.h"
namespace impeller {
SweepGradientContents::SweepGradientContents() = default;
SweepGradientContents::~SweepGradientContents() = default;
void SweepGradientContents::SetCenterAndAngles(Point center,
Degrees start_angle,
Degrees end_angle) {
center_ = center;
Scalar t0 = start_angle.degrees / 360;
Scalar t1 = end_angle.degrees / 360;
FML_DCHECK(t0 < t1);
bias_ = -t0;
scale_ = 1 / (t1 - t0);
}
void SweepGradientContents::SetColors(std::vector<Color> colors) {
colors_ = std::move(colors);
}
void SweepGradientContents::SetStops(std::vector<Scalar> stops) {
stops_ = std::move(stops);
}
void SweepGradientContents::SetTileMode(Entity::TileMode tile_mode) {
tile_mode_ = tile_mode;
}
const std::vector<Color>& SweepGradientContents::GetColors() const {
return colors_;
}
const std::vector<Scalar>& SweepGradientContents::GetStops() const {
return stops_;
}
bool SweepGradientContents::IsOpaque() const {
if (GetOpacity() < 1) {
return false;
}
for (auto color : colors_) {
if (!color.IsOpaque()) {
return false;
}
}
return true;
}
bool SweepGradientContents::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 SweepGradientContents::RenderSSBO(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = SweepGradientSSBOFillPipeline::VertexShader;
using FS = SweepGradientSSBOFillPipeline::FragmentShader;
FS::FragInfo frag_info;
frag_info.center = center_;
frag_info.bias = bias_;
frag_info.scale = scale_;
frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
frag_info.alpha = GetOpacity();
auto& host_buffer = pass.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 = Matrix::MakeOrthographic(pass.GetRenderTargetSize()) *
entity.GetTransformation();
frame_info.matrix = GetInverseMatrix();
Command cmd;
cmd.label = "SweepGradientSSBOFill";
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.GetSweepGradientSSBOFillPipeline(options);
cmd.BindVertices(geometry_result.vertex_buffer);
FS::BindFragInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frag_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) {
auto restore = ClipRestoreContents();
restore.SetRestoreCoverage(GetCoverage(entity));
return restore.Render(renderer, entity, pass);
}
return true;
}
bool SweepGradientContents::RenderTexture(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = SweepGradientFillPipeline::VertexShader;
using FS = SweepGradientFillPipeline::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.bias = bias_;
frag_info.scale = scale_;
frag_info.texture_sampler_y_coord_scale = gradient_texture->GetYCoordScale();
frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
frag_info.alpha = GetOpacity();
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 = GetInverseMatrix();
Command cmd;
cmd.label = "SweepGradientFill";
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.GetSweepGradientFillPipeline(options);
cmd.BindVertices(geometry_result.vertex_buffer);
FS::BindFragInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frag_info));
VS::BindFrameInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frame_info));
SamplerDescriptor sampler_desc;
sampler_desc.min_filter = MinMagFilter::kLinear;
sampler_desc.mag_filter = MinMagFilter::kLinear;
FS::BindTextureSampler(
cmd, gradient_texture,
renderer.GetContext()->GetSamplerLibrary()->GetSampler(sampler_desc));
if (!pass.AddCommand(std::move(cmd))) {
return false;
}
if (geometry_result.prevent_overdraw) {
auto restore = ClipRestoreContents();
restore.SetRestoreCoverage(GetCoverage(entity));
return restore.Render(renderer, entity, pass);
}
return true;
}
} // namespace impeller