#include <mbgl/programs/fill_program.hpp>
#include <mbgl/renderer/image_atlas.hpp>
#include <mbgl/renderer/cross_faded_property_evaluator.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <mbgl/map/transform_state.hpp>

namespace mbgl {

using namespace style;

static_assert(sizeof(FillLayoutVertex) == 4, "expected FillLayoutVertex size");

FillPatternProgram::LayoutUniformValues FillPatternProgram::layoutUniformValues(mat4 matrix,
                                                                                Size framebufferSize,
                                                                                Size atlasSize,
                                                                                const CrossfadeParameters& crossfade,
                                                                                const UnwrappedTileID& tileID,
                                                                                const TransformState& state,
                                                                                const float pixelRatio) {
    const auto tileRatio = 1 / tileID.pixelsToTileUnits(1, state.getIntegerZoom());
    int32_t tileSizeAtNearestZoom = static_cast<int32_t>(util::tileSize_D *
                                                         state.zoomScale(state.getIntegerZoom() - tileID.canonical.z));
    int32_t pixelX = static_cast<int32_t>(tileSizeAtNearestZoom *
                                          (tileID.canonical.x + tileID.wrap * state.zoomScale(tileID.canonical.z)));
    int32_t pixelY = tileSizeAtNearestZoom * tileID.canonical.y;

    return {uniforms::matrix::Value(matrix),
            uniforms::world::Value(framebufferSize),
            uniforms::texsize::Value(atlasSize),
            uniforms::scale::Value({{pixelRatio, tileRatio, crossfade.fromScale, crossfade.toScale}}),
            uniforms::fade::Value(crossfade.t),
            uniforms::pixel_coord_upper::Value(
                std::array<float, 2>{{static_cast<float>(pixelX >> 16), static_cast<float>(pixelY >> 16)}}),
            uniforms::pixel_coord_lower::Value(
                std::array<float, 2>{{static_cast<float>(pixelX & 0xFFFF), static_cast<float>(pixelY & 0xFFFF)}})};
}

} // namespace mbgl
