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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 "impeller/entity/geometry/cover_geometry.h"
#include "impeller/renderer/render_pass.h"
namespace impeller {
CoverGeometry::CoverGeometry() = default;
GeometryResult CoverGeometry::GetPositionBuffer(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
auto rect = Rect::MakeSize(pass.GetRenderTargetSize());
constexpr uint16_t kRectIndicies[4] = {0, 1, 2, 3};
auto& host_buffer = pass.GetTransientsBuffer();
return GeometryResult{
.type = PrimitiveType::kTriangleStrip,
.vertex_buffer =
{
.vertex_buffer = host_buffer.Emplace(
rect.GetTransformedPoints(entity.GetTransform().Invert())
.data(),
8 * sizeof(float), alignof(float)),
.index_buffer = host_buffer.Emplace(
kRectIndicies, 4 * sizeof(uint16_t), alignof(uint16_t)),
.vertex_count = 4,
.index_type = IndexType::k16bit,
},
.transform = Matrix::MakeOrthographic(pass.GetRenderTargetSize()) *
entity.GetTransform(),
.prevent_overdraw = false,
};
}
// |Geometry|
GeometryResult CoverGeometry::GetPositionUVBuffer(
Rect texture_coverage,
Matrix effect_transform,
const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
auto rect = Rect::MakeSize(pass.GetRenderTargetSize());
return ComputeUVGeometryForRect(rect, texture_coverage, effect_transform,
renderer, entity, pass);
}
GeometryVertexType CoverGeometry::GetVertexType() const {
return GeometryVertexType::kPosition;
}
std::optional<Rect> CoverGeometry::GetCoverage(const Matrix& transform) const {
return Rect::MakeMaximum();
}
bool CoverGeometry::CoversArea(const Matrix& transform,
const Rect& rect) const {
return true;
}
} // namespace impeller