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#pragma once
#include <mbgl/gl/vertex_buffer.hpp>
#include <mbgl/gl/index_buffer.hpp>
#include <mbgl/gl/segment.hpp>
#include <stdexcept>
namespace mbgl {
template <class DrawMode, class LayoutVertex, class AttributeLayout>
class Drawable;
template <class DrawMode, class LayoutVertex, class AttributeLayout>
class IndexedPrimitives {
public:
void add(std::initializer_list<LayoutVertex> v,
std::initializer_list<std::array<uint16_t, DrawMode::bufferGroupSize>> i) {
// Check that all vertices fit into the current segment, if not, create a new one.
if (segmentInfo.empty() || segmentInfo.back().vertexLength + v.size() > std::numeric_limits<uint16_t>::max()) {
segmentInfo.emplace_back(vertices.vertexSize(), indices.indexSize());
}
auto& segment = segmentInfo.back();
const uint16_t offset = segment.vertexLength;
for (const auto& primitive : i) {
for (uint16_t index : primitive) {
// Check that the index references a vertex supplied in this list and that it is not
// out of bounds.
if (index >= v.size()) {
throw std::out_of_range("primitive contains indices outside its vertex group");
}
}
// Insert all indices into the list.
addIndices(primitive, offset, std::make_index_sequence<DrawMode::bufferGroupSize>());
}
// Insert all vertices into the list.
for (const auto& vertex : v) {
vertices.emplace_back(vertex);
}
// Update the current segment statistics.
segment.vertexLength += v.size();
segment.indexLength += i.size() * DrawMode::bufferGroupSize;
}
// Accessors for test suite.
const gl::VertexVector<LayoutVertex>& getVertices() const {
return vertices;
}
const gl::IndexVector<DrawMode>& getIndices() const {
return indices;
}
const gl::SegmentInfoVector& getSegmentInfo() const {
return segmentInfo;
}
private:
// Helper function for expanding primitives.
template <std::size_t N, std::size_t... I>
void addIndices(std::array<uint16_t, N> primitive, const uint16_t offset, std::index_sequence<I...>) {
// Adds the current offset to the indices.
indices.emplace_back((std::get<I>(primitive) + offset)...);
}
private:
friend class Drawable<DrawMode, LayoutVertex, AttributeLayout>;
gl::VertexVector<LayoutVertex> vertices;
gl::IndexVector<DrawMode> indices;
gl::SegmentInfoVector segmentInfo;
};
} // namespace mbgl
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