[core] Simplify generate-shaders.js

We moved the #pragma ⇢ #ifndef logic into gl-js.

1 files changed, 11 insertions, 77 deletions

diff --git a/scripts/generate-shaders.js b/scripts/generate-shaders.js
index a10e505278..39aed3053e 100755
--- a/scripts/generate-shaders.js
+++ b/scripts/generate-shaders.js
@@ -3,14 +3,11 @@
 const path = require('path');
 const fs = require('fs');
 
-const inputPath = 'mapbox-gl-js/src/shaders';
+const shaders = require('../mapbox-gl-js/src/shaders');
 const outputPath = 'src/mbgl/shaders';
 
 require('./style-code');
 
-const vertexPrelude = fs.readFileSync(path.join(inputPath, '_prelude.vertex.glsl'));
-const fragmentPrelude = fs.readFileSync(path.join(inputPath, '_prelude.fragment.glsl'));
-
 writeIfModified(path.join(outputPath, 'preludes.hpp'), `// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
 
 #pragma once
@@ -33,84 +30,21 @@ namespace mbgl {
 namespace shaders {
 
 const char* vertexPrelude = R"MBGL_SHADER(
-${vertexPrelude}
+${shaders.prelude.vertexSource}
 )MBGL_SHADER";
 const char* fragmentPrelude = R"MBGL_SHADER(
-${fragmentPrelude}
+${shaders.prelude.fragmentSource}
 )MBGL_SHADER";
 
 } // namespace shaders
 } // namespace mbgl
 `);
 
-[
-    'circle',
-    'collision_box',
-    'debug',
-    'extrusion_texture',
-    'fill',
-    'fill_extrusion',
-    'fill_extrusion_pattern',
-    'fill_outline',
-    'fill_outline_pattern',
-    'fill_pattern',
-    'line',
-    'line_pattern',
-    'line_sdf',
-    'raster',
-    'symbol_icon',
-    'symbol_sdf'
-].forEach(function (shaderName) {
-    const re = / *#pragma mapbox: ([\w]+) ([\w]+) ([\w]+) ([\w]+)/g;
-    const fragmentPragmas = new Set();
-
-    let fragmentSource = fs.readFileSync(path.join(inputPath, shaderName + '.fragment.glsl'), 'utf8');
-    let vertexSource = fs.readFileSync(path.join(inputPath, shaderName + '.vertex.glsl'), 'utf8');
-
-    fragmentSource = fragmentSource.replace(re, (match, operation, precision, type, name) => {
-        fragmentPragmas.add(name);
-        return operation === "define" ? `
-#ifndef HAS_UNIFORM_u_${name}
-varying ${precision} ${type} ${name};
-#else
-uniform ${precision} ${type} u_${name};
-#endif` : `
-#ifdef HAS_UNIFORM_u_${name}
-    ${precision} ${type} ${name} = u_${name};
-#endif`;
-    });
-
-    vertexSource = vertexSource.replace(re, (match, operation, precision, type, name) => {
-        const a_type = type === "float" ? "vec2" : "vec4";
-        if (fragmentPragmas.has(name)) {
-            return operation === "define" ? `
-#ifndef HAS_UNIFORM_u_${name}
-uniform lowp float a_${name}_t;
-attribute ${precision} ${a_type} a_${name};
-varying ${precision} ${type} ${name};
-#else
-uniform ${precision} ${type} u_${name};
-#endif` : `
-#ifndef HAS_UNIFORM_u_${name}
-    ${name} = unpack_mix_${a_type}(a_${name}, a_${name}_t);
-#else
-    ${precision} ${type} ${name} = u_${name};
-#endif`;
-        } else {
-            return operation === "define" ? `
-#ifndef HAS_UNIFORM_u_${name}
-uniform lowp float a_${name}_t;
-attribute ${precision} ${a_type} a_${name};
-#else
-uniform ${precision} ${type} u_${name};
-#endif` : `
-#ifndef HAS_UNIFORM_u_${name}
-    ${precision} ${type} ${name} = unpack_mix_${a_type}(a_${name}, a_${name}_t);
-#else
-    ${precision} ${type} ${name} = u_${name};
-#endif`;
-        }
-    });
+for (const key in shaders) {
+    if (key === 'prelude')
+        continue;
+
+    const shaderName = key.replace(/[A-Z]+/g, (match) => `_${match.toLowerCase()}`);
 
     writeIfModified(path.join(outputPath, `${shaderName}.hpp`), `// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
 
@@ -139,13 +73,13 @@ namespace shaders {
 
 const char* ${shaderName}::name = "${shaderName}";
 const char* ${shaderName}::vertexSource = R"MBGL_SHADER(
-${vertexSource}
+${shaders[key].vertexSource}
 )MBGL_SHADER";
 const char* ${shaderName}::fragmentSource = R"MBGL_SHADER(
-${fragmentSource}
+${shaders[key].fragmentSource}
 )MBGL_SHADER";
 
 } // namespace shaders
 } // namespace mbgl
 `);
-});
+}