[core, ios, macos, android, node] Heatmap layer (#11046)

Co-Authored-By: Konstantin Käfer <mail@kkaefer.com>
Co-Authored-By: Anand Thakker <anandthakker@users.noreply.github.com>
Co-Authored-By: Minh Nguyễn <1ec5@users.noreply.github.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/mbgl/programs/heatmap_program.hpp b/src/mbgl/programs/heatmap_program.hpp
new file mode 100644
index 0000000000..2d9b80404f
--- /dev/null
+++ b/src/mbgl/programs/heatmap_program.hpp
@@ -0,0 +1,49 @@
+#pragma once
+
+#include <mbgl/programs/program.hpp>
+#include <mbgl/programs/attributes.hpp>
+#include <mbgl/programs/uniforms.hpp>
+#include <mbgl/shaders/heatmap.hpp>
+#include <mbgl/util/geometry.hpp>
+#include <mbgl/style/layers/heatmap_layer_properties.hpp>
+
+namespace mbgl {
+
+namespace uniforms {
+MBGL_DEFINE_UNIFORM_SCALAR(float, u_intensity);
+} // namespace uniforms
+
+class HeatmapProgram : public Program<
+    shaders::heatmap,
+    gl::Triangle,
+    gl::Attributes<
+        attributes::a_pos>,
+    gl::Uniforms<
+        uniforms::u_intensity,
+        uniforms::u_matrix,
+        uniforms::heatmap::u_extrude_scale>,
+    style::HeatmapPaintProperties>
+{
+public:
+    using Program::Program;
+
+    /*
+     * @param {number} x vertex position
+     * @param {number} y vertex position
+     * @param {number} ex extrude normal
+     * @param {number} ey extrude normal
+     */
+    static LayoutVertex vertex(Point<int16_t> p, float ex, float ey) {
+        return LayoutVertex {
+            {{
+                static_cast<int16_t>((p.x * 2) + ((ex + 1) / 2)),
+                static_cast<int16_t>((p.y * 2) + ((ey + 1) / 2))
+            }}
+        };
+    }
+};
+
+using HeatmapLayoutVertex = HeatmapProgram::LayoutVertex;
+using HeatmapAttributes = HeatmapProgram::Attributes;
+
+} // namespace mbgl