blob: 43ae975ffd3ddcb857854192218caf2ee5160042 [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/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::Render(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
using VS = SweepGradientFillPipeline::VertexShader;
using FS = SweepGradientFillPipeline::FragmentShader;
auto gradient_texture =
CreateGradientTexture(colors_, stops_, renderer.GetContext());
if (gradient_texture == nullptr) {
return false;
}
FS::GradientInfo gradient_info;
gradient_info.center = center_;
gradient_info.bias = bias_;
gradient_info.scale = scale_;
gradient_info.texture_sampler_y_coord_scale =
gradient_texture->GetYCoordScale();
gradient_info.tile_mode = static_cast<Scalar>(tile_mode_);
gradient_info.alpha = GetAlpha();
gradient_info.half_texel = Vector2(0.5 / gradient_texture->GetSize().width,
0.5 / gradient_texture->GetSize().height);
VS::FrameInfo frame_info;
frame_info.mvp = Matrix::MakeOrthographic(pass.GetRenderTargetSize()) *
entity.GetTransformation();
frame_info.matrix = GetInverseMatrix();
Command cmd;
cmd.label = "SweepGradientFill";
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.GetSweepGradientFillPipeline(options);
cmd.BindVertices(geometry_result.vertex_buffer);
FS::BindGradientInfo(
cmd, pass.GetTransientsBuffer().EmplaceUniform(gradient_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) {
return ClipRestoreContents().Render(renderer, entity, pass);
}
return true;
}
} // namespace impeller