1 files changed, 84 insertions, 0 deletions
diff --git a/scripts/generate-shaders.js b/scripts/generate-shaders.js
new file mode 100755
index 0000000000..7660a6e66e
--- /dev/null
+++ b/scripts/generate-shaders.js
@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+
+var path = require('path');
+var fs = require('fs');
+
+var inputPath = 'mapbox-gl-js/shaders';
+var outputPath = 'src/mbgl/shaders';
+
+require('./style-code');
+
+[
+    'circle',
+    'collision_box',
+    'debug',
+    'fill',
+    'fill_outline',
+    'fill_outline_pattern',
+    'fill_pattern',
+    'line',
+    'line_pattern',
+    'line_sdf',
+    'raster',
+    'symbol_icon',
+    'symbol_sdf'
+].forEach(function (shaderName) {
+    function applyPragmas(source, pragmas) {
+        return source.replace(/#pragma mapbox: ([\w]+) ([\w]+) ([\w]+) ([\w]+)/g, (match, operation, precision, type, name) => {
+            return pragmas[operation]
+                .join("\n")
+                .replace(/\{type\}/g, type)
+                .replace(/\{precision\}/g, precision)
+                .replace(/\{name\}/g, name);
+        });
+    }
+
+    function vertexSource() {
+        var prelude = fs.readFileSync(path.join(inputPath, '_prelude.vertex.glsl'));
+        var source = fs.readFileSync(path.join(inputPath, shaderName + '.vertex.glsl'), 'utf8');
+        return prelude + applyPragmas(source, {
+                define: [
+                    "uniform lowp float a_{name}_t;",
+                    "attribute {precision} {type} a_{name}_min;",
+                    "attribute {precision} {type} a_{name}_max;",
+                    "varying {precision} {type} {name};"
+                ],
+                initialize: [
+                    "{name} = mix(a_{name}_min, a_{name}_max, a_{name}_t);"
+                ]
+            });
+    }
+
+    function fragmentSource() {
+        var prelude = fs.readFileSync(path.join(inputPath, '_prelude.fragment.glsl'));
+        var source = fs.readFileSync(path.join(inputPath, shaderName + '.fragment.glsl'), 'utf8');
+        return prelude + applyPragmas(source, {
+                define: [
+                    "varying {precision} {type} {name};"
+                ],
+                initialize: [
+                ]
+            });
+    }
+
+    var content = "#pragma once\n" +
+    "\n" +
+    "// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.\n" +
+    "\n" +
+    "#include <mbgl/gl/gl.hpp>\n" +
+    "\n" +
+    "namespace mbgl {\n" +
+    "namespace shaders {\n" +
+    "\n" +
+    "class " + shaderName + " {\n" +
+    "public:\n" +
+    "    static constexpr const char* name = \"" + shaderName + "\";\n" +
+    "    static constexpr const char* vertexSource = R\"MBGL_SHADER(\n" + vertexSource() + ")MBGL_SHADER\";\n" +
+    "    static constexpr const char* fragmentSource = R\"MBGL_SHADER(\n" + fragmentSource() + ")MBGL_SHADER\";\n" +
+    "};\n" +
+    "\n" +
+    "} // namespace shaders\n" +
+    "} // namespace mbgl\n";
+
+    writeIfModified(path.join(outputPath, shaderName + '.hpp'), content);
+});