127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
#include <llmr/renderer/fill_bucket.hpp>
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#include <llmr/geometry/fill_buffer.hpp>
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#include <llmr/geometry/geometry.hpp>
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#include <llmr/renderer/painter.hpp>
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#include <llmr/style/style.hpp>
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#include <llmr/map/vector_tile.hpp>
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#include <llmr/platform/gl.hpp>
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#include <cassert>
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struct geometry_too_long_exception : std::exception {};
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using namespace llmr;
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FillBucket::FillBucket(const std::shared_ptr<FillBuffer>& buffer, const BucketDescription& bucket_desc)
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: geom_desc(bucket_desc.geometry),
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buffer(buffer),
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vertex_start(buffer->vertex_length()),
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elements_start(buffer->elements_length()),
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length(0) {
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}
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void FillBucket::addGeometry(pbf& geom) {
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std::vector<Coordinate> line;
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Geometry::command cmd;
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Coordinate coord;
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Geometry geometry(geom);
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int32_t x, y;
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while ((cmd = geometry.next(x, y)) != Geometry::end) {
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if (cmd == Geometry::move_to) {
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if (line.size()) {
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addGeometry(line);
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line.clear();
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}
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}
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line.emplace_back(x, y);
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}
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if (line.size()) {
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addGeometry(line);
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}
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}
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void FillBucket::addGeometry(const std::vector<Coordinate>& line) {
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// Alias this.
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FillBuffer& buffer = *this->buffer;
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uint32_t vertex_start = buffer.vertex_length();
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buffer.addDegenerate();
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for (const Coordinate& coord : line) {
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buffer.addCoordinate(coord.x, coord.y);
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}
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uint32_t vertex_end = buffer.vertex_length();
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if (vertex_end - vertex_start > 65535) {
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throw geometry_too_long_exception();
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}
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FillBucket& index = *this;
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if (!index.groups.size()) {
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index.groups.emplace_back();
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}
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uint32_t vertex_count = vertex_end - vertex_start;
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index.length += vertex_count;
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if (index.groups.back().vertex_length + vertex_count > 65535) {
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// Move to a new group because the old one can't hold the geometry.
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index.groups.emplace_back();
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}
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group& group = index.groups.back();
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// We're generating triangle fans, so we always start with the first
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// coordinate in this polygon.
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// The first valid index that is not a degenerate.
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uint16_t firstIndex = group.vertex_length + 1;
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assert(firstIndex + vertex_count - 1 < 65536);
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uint32_t elements_start = buffer.elements_length();
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for (uint32_t i = 2; i < vertex_count; i++) {
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buffer.addElements(firstIndex, firstIndex + i - 1, firstIndex + i);
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}
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uint32_t elements_end = buffer.elements_length();
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uint32_t elements_count = elements_end - elements_start;
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group.vertex_length += vertex_count;
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group.elements_length += elements_count;
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}
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void FillBucket::render(Painter& painter, const std::string& layer_name, const Tile::ID& id) {
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painter.renderFill(*this, layer_name, id);
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}
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uint32_t FillBucket::size() const {
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return length;
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}
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void FillBucket::drawElements(PlainShader& shader) {
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char *vertex_index = BUFFER_OFFSET(vertex_start * 2 * sizeof(int16_t));
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char *elements_index = BUFFER_OFFSET(elements_start * 3 * sizeof(int16_t));
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for (group& group : groups) {
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group.array.bind(shader, *buffer, vertex_index);
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glDrawElements(GL_TRIANGLES, group.elements_length * 3 - 3, GL_UNSIGNED_SHORT, elements_index);
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vertex_index += group.vertex_length * 2 * sizeof(uint16_t);
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elements_index += group.elements_length * 3 * sizeof(uint16_t);
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}
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}
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void FillBucket::drawVertices(OutlineShader& shader) {
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// Draw the entire line
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char *vertex_index = BUFFER_OFFSET(vertex_start * 2 * sizeof(int16_t));
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array.bind(shader, *buffer, vertex_index);
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glDrawArrays(GL_LINE_STRIP, 0, length);
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}
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