[build] convert build-shaders script from Python to Node.js

1 files changed, 71 insertions, 0 deletions

diff --git a/scripts/build-shaders.js b/scripts/build-shaders.js
new file mode 100755
index 0000000000..9090f19e6d
--- /dev/null
+++ b/scripts/build-shaders.js
@@ -0,0 +1,71 @@
+#!/usr/bin/env node
+
+var path = require('path');
+var fs = require('fs');
+var mkdirp = require('mkdirp');
+
+var input_file = process.argv[2]
+var output_file = process.argv[3];
+
+if (!input_file || !output_file) {
+    console.warn('No input or output file given.');
+    console.warn('Usage: %s [input.vertex.glsl] [output.vertex.hpp]', path.basename(process.argv[1]));
+    process.exit(1);
+}
+
+var components = path.basename(input_file).split('.');
+
+var shader_name = components[0];
+var shader_type = components[1];
+var extension = components[2];
+
+var data = fs.readFileSync(input_file, 'utf8');
+
+// Replace uniform pragmas
+
+var pragma_mapbox_regex = /(\s*)#pragma\s+mapbox\s*:\s+(define|initialize)\s+(low|medium|high)p\s+(float|vec(?:2|3|4))\s+(.*)/;
+
+var data = data.split('\n').map(function(line) {
+    var params = line.match(pragma_mapbox_regex);
+    if (params) {
+        if (params[2] === 'define') {
+            return params[1] + 'uniform ' + params[3] + 'p ' + params[4] + ' u_' + params[5] + ';';
+        } else {
+            return params[1] + params[3] + 'p ' + params[4] + ' ' + params[5] + ' = u_' + params[5] + ';';
+        }
+    } else {
+        return line;
+    }
+}).join('\n');
+
+
+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' +
+    'namespace ' + shader_name + ' {\n' +
+    '\n' +
+    '#ifndef MBGL_SHADER_NAME_' + shader_name.toUpperCase() + '\n' +
+    '#define MBGL_SHADER_NAME_' + shader_name.toUpperCase() + '\n' +
+    'constexpr const char* name = "' + shader_name + '";\n' +
+    '#endif // MBGL_SHADER_NAME_' + shader_name.toUpperCase() + '\n' +
+    '\n' +
+    'constexpr const char* ' + shader_type + ' =\n' +
+    '#ifdef GL_ES_VERSION_2_0\n' +
+    '    "precision highp float;"\n' +
+    '#else\n' +
+    '    "#version 120"\n' +
+    '#endif\n' +
+    '    R"MBGL_SHADER(\n' + data + ')MBGL_SHADER";\n' +
+    '\n' +
+    '} // namespace ' + shader_name + '\n' +
+    '} // namespace shaders\n' +
+    '} // namespace mbgl\n';
+
+mkdirp.sync(path.dirname(output_file));
+fs.writeFileSync(output_file, content);