diff options
Diffstat (limited to 'src/mbgl/geometry/icon_buffer.cpp')
-rw-r--r-- | src/mbgl/geometry/icon_buffer.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/mbgl/geometry/icon_buffer.cpp b/src/mbgl/geometry/icon_buffer.cpp new file mode 100644 index 0000000000..c571dfa69e --- /dev/null +++ b/src/mbgl/geometry/icon_buffer.cpp @@ -0,0 +1,35 @@ +#include <mbgl/geometry/icon_buffer.hpp> +#include <mbgl/platform/gl.hpp> +#include <mbgl/util/math.hpp> + +#include <cmath> + +namespace mbgl { + +const double IconVertexBuffer::angleFactor = 128.0 / M_PI; + +size_t IconVertexBuffer::add(int16_t x, int16_t y, float ox, float oy, int16_t tx, int16_t ty, float angle, float minzoom, std::array<float, 2> range, float maxzoom, float labelminzoom) { + const size_t idx = index(); + void *data = addElement(); + + int16_t *shorts = static_cast<int16_t *>(data); + shorts[0] /* pos */ = x; + shorts[1] /* pos */ = y; + shorts[2] /* offset */ = std::round(ox * 64); // use 1/64 pixels for placement + shorts[3] /* offset */ = std::round(oy * 64); + + uint8_t *ubytes = static_cast<uint8_t *>(data); + ubytes[8] /* labelminzoom */ = labelminzoom * 10; + ubytes[9] /* minzoom */ = minzoom * 10; // 1/10 zoom levels: z16 == 160. + ubytes[10] /* maxzoom */ = std::fmin(maxzoom, 25) * 10; // 1/10 zoom levels: z16 == 160. + ubytes[11] /* angle */ = (int16_t)std::round(angle * angleFactor) % 256; + ubytes[12] /* rangeend */ = util::max((int16_t)std::round(range[0] * angleFactor), (int16_t)0) % 256; + ubytes[13] /* rangestart */ = util::min((int16_t)std::round(range[1] * angleFactor), (int16_t)255) % 256; + + shorts[8] /* tex */ = tx; + shorts[9] /* tex */ = ty; + + return idx; +} + +} |