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#!/usr/bin/env node
'use strict';
var fs = require('fs');
var path = require('path');
var mkdirp = require('mkdirp');
try { var glsl = require('mapbox-glsl-optimizer'); } catch(err) {}
module.exports = function(shader_type, prefix, suffix) {
var name;
var shaders = {};
var shaderFiles = fs.readdirSync('src/shader');
// Load shaders
for (var i = 0; i < shaderFiles.length; i++) {
var parts = shaderFiles[i].match(/^(.+)\.(vertex|fragment)\.glsl$/);
if (parts) {
name = parts[1];
var type = parts[2];
if (!(name in shaders)) {
shaders[name] = {};
}
shaders[name][type] = fs.readFileSync(path.join('src/shader', shaderFiles[i]), 'utf8');
}
}
var preamble = '';
if (shader_type == 'gles2' || shader_type == 'gles3') {
preamble = 'precision highp float;';
} else {
preamble = '#version 120';
}
for (var name in shaders) {
shaders[name].vertex = preamble + '\n' + shaders[name].vertex;
shaders[name].fragment = preamble + '\n' + shaders[name].fragment;
}
// Optimize shader
if (glsl) {
var target = shader_type == 'gles2' ? glsl.TARGET_OPENGLES20 : (shader_type == 'gles3' ? glsl.TARGET_OPENGLES30 : glsl.TARGET_OPENGL);
var compiler = new glsl.Compiler(target);
for (name in shaders) {
var vertex_shader = new glsl.Shader(compiler, glsl.VERTEX_SHADER, shaders[name].vertex);
if (vertex_shader.compiled()) {
shaders[name].vertex = vertex_shader.output();
} else {
console.warn('failed to optimize %s vertex shader', name);
process.exit(1);
}
vertex_shader.dispose();
var fragment_shader = new glsl.Shader(compiler, glsl.FRAGMENT_SHADER, shaders[name].fragment);
if (fragment_shader.compiled()) {
shaders[name].fragment = fragment_shader.output();
} else {
console.warn('failed to optimize %s fragment shader', name);
process.exit(1);
}
fragment_shader.dispose();
}
compiler.dispose();
} else {
console.warn('Not optimizing shaders');
}
// Save to file
var lines = [];
var consts = [];
for (var name in shaders) {
consts.push(name.toUpperCase() + '_SHADER');
var line = '';
line += ' {\n';
line += ' ' + JSON.stringify(shaders[name].vertex) + ',\n';
line += ' ' + JSON.stringify(shaders[name].fragment) + ',\n';
line += ' }';
lines.push(line);
}
var header = '// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.\n\n';
header += '#ifndef MBGL_SHADER_SHADERS\n';
header += '#define MBGL_SHADER_SHADERS\n';
header += '\n';
header += 'namespace mbgl {\n';
header += '\n';
header += 'struct shader_source {\n';
header += ' const char *vertex;\n';
header += ' const char *fragment;\n';
header += '};\n';
header += '\n';
header += 'enum {\n';
consts.push('SHADER_COUNT');
header += ' ' + consts.join(',\n ') + '\n';
header += '};\n';
header += '\n';
header += 'extern const shader_source shaders[SHADER_COUNT];\n';
header += '\n';
header += '}\n';
header += '\n';
header += '#endif\n';
var code = '// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.\n';
code += '#include <mbgl/platform/gl.hpp>\n';
code += prefix + '\n';
code += '#include <mbgl/shader/shaders.hpp>\n';
code += '\n';
code += 'namespace mbgl {\n';
code += '\n';
code += 'const shader_source shaders[SHADER_COUNT] = {\n';
code += lines.join(',\n');
code += '\n};\n';
code += '\n}\n';
code += suffix + '\n';
var header_path = path.join(process.argv[2], 'include/mbgl/shader/shaders.hpp');
mkdirp.sync(path.dirname(header_path));
fs.writeFileSync(header_path, header);
console.warn('wrote file ' + header_path);
var file_path = path.join(process.argv[2], 'src/shader/shaders_' + shader_type + '.cpp');
mkdirp.sync(path.dirname(file_path));
fs.writeFileSync(file_path, code);
console.warn('wrote file ' + file_path);
};
module.exports('gl', '#ifndef GL_ES_VERSION_2_0', '#endif');
module.exports('gles2', '#ifdef GL_ES_VERSION_2_0', '#endif');
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