1 files changed, 113 insertions, 0 deletions
diff --git a/src/mbgl/renderer/buckets/hillshade_bucket.cpp b/src/mbgl/renderer/buckets/hillshade_bucket.cpp
new file mode 100644
index 0000000000..8011681ee0
--- /dev/null
+++ b/src/mbgl/renderer/buckets/hillshade_bucket.cpp
@@ -0,0 +1,113 @@
+#include <mbgl/renderer/buckets/hillshade_bucket.hpp>
+#include <mbgl/renderer/layers/render_hillshade_layer.hpp>
+#include <mbgl/programs/hillshade_program.hpp>
+#include <mbgl/programs/hillshade_prepare_program.hpp>
+#include <mbgl/gl/context.hpp>
+
+namespace mbgl {
+
+using namespace style;
+
+HillshadeBucket::HillshadeBucket(PremultipliedImage&& image_): demdata(image_) {
+}
+
+HillshadeBucket::HillshadeBucket(DEMData&& demdata_) : demdata(std::move(demdata_)) {
+}
+
+const DEMData& HillshadeBucket::getDEMData() const {
+    return demdata;
+}
+
+DEMData& HillshadeBucket::getDEMData() {
+    return demdata;
+}
+
+void HillshadeBucket::upload(gl::Context& context) {
+    if (!hasData()) {
+        return;
+    }
+
+
+    const PremultipliedImage* image = demdata.getImage();
+    dem = context.createTexture(*image);
+
+    if (!segments.empty()) {
+        vertexBuffer = context.createVertexBuffer(std::move(vertices));
+        indexBuffer = context.createIndexBuffer(std::move(indices));
+    }
+    uploaded = true;
+}
+
+void HillshadeBucket::clear() {
+    vertexBuffer = {};
+    indexBuffer = {};
+    segments.clear();
+    vertices.clear();
+    indices.clear();
+
+    uploaded = false;
+}
+
+void HillshadeBucket::setMask(TileMask&& mask_) {
+    if (mask == mask_) {
+        return;
+    }
+
+    mask = std::move(mask_);
+    clear();
+
+    if (mask == TileMask{ { 0, 0, 0 } }) {
+        // We want to render the full tile, and keeping the segments/vertices/indices empty means
+        // using the global shared buffers for covering the entire tile.
+        return;
+    }
+
+    // Create a new segment so that we will upload (empty) buffers even when there is nothing to
+    // draw for this tile.
+    segments.emplace_back(0, 0);
+
+    constexpr const uint16_t vertexLength = 4;
+
+    // Create the vertex buffer for the specified tile mask.
+    for (const auto& id : mask) {
+        // Create a quad for every masked tile.
+        const int32_t vertexExtent = util::EXTENT >> id.z;
+
+        const Point<int16_t> tlVertex = { static_cast<int16_t>(id.x * vertexExtent),
+                                          static_cast<int16_t>(id.y * vertexExtent) };
+        const Point<int16_t> brVertex = { static_cast<int16_t>(tlVertex.x + vertexExtent),
+                                          static_cast<int16_t>(tlVertex.y + vertexExtent) };
+
+        if (segments.back().vertexLength + vertexLength > std::numeric_limits<uint16_t>::max()) {
+            // Move to a new segments because the old one can't hold the geometry.
+            segments.emplace_back(vertices.vertexSize(), indices.indexSize());
+        }
+
+        vertices.emplace_back(
+            HillshadeProgram::layoutVertex({ tlVertex.x, tlVertex.y }, { static_cast<uint16_t>(tlVertex.x), static_cast<uint16_t>(tlVertex.y) }));
+        vertices.emplace_back(
+            HillshadeProgram::layoutVertex({ brVertex.x, tlVertex.y }, { static_cast<uint16_t>(brVertex.x), static_cast<uint16_t>(tlVertex.y) }));
+        vertices.emplace_back(
+            HillshadeProgram::layoutVertex({ tlVertex.x, brVertex.y }, { static_cast<uint16_t>(tlVertex.x), static_cast<uint16_t>(brVertex.y) }));
+        vertices.emplace_back(
+            HillshadeProgram::layoutVertex({ brVertex.x, brVertex.y }, { static_cast<uint16_t>(brVertex.x), static_cast<uint16_t>(brVertex.y) }));
+
+        auto& segment = segments.back();
+        assert(segment.vertexLength <= std::numeric_limits<uint16_t>::max());
+        const uint16_t offset = segment.vertexLength;
+
+        // 0, 1, 2
+        // 1, 2, 3
+        indices.emplace_back(offset, offset + 1, offset + 2);
+        indices.emplace_back(offset + 1, offset + 2, offset + 3);
+
+        segment.vertexLength += vertexLength;
+        segment.indexLength += 6;
+    }
+}
+
+bool HillshadeBucket::hasData() const {
+    return demdata.getImage()->valid();
+}
+
+} // namespace mbgl