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