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[core] Reduce number of varyings to 8 or less

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For #pragmas, don't generate varyings for attributes that aren't used by the fragment shader. Pack other varyings more tightly.
This commit is contained in:
John Firebaugh
2017-06-12 16:39:59 -07:00
parent 7bfcce0266
commit 441b80d574
6 changed files with 71 additions and 81 deletions
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61
scripts/generate-shaders.js
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@@ -61,42 +61,31 @@ ${fragmentPrelude}
'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) => {
const a_type = type === "float" ? "vec2" : "vec4";
return pragmas[operation]
.join("\n")
.replace(/\{type\}/g, type)
.replace(/\{a_type}/g, a_type)
.replace(/\{precision\}/g, precision)
.replace(/\{name\}/g, name);
});
}
const re = /#pragma mapbox: ([\w]+) ([\w]+) ([\w]+) ([\w]+)/g;
const fragmentPragmas = new Set();
function vertexSource() {
const source = fs.readFileSync(path.join(inputPath, shaderName + '.vertex.glsl'), 'utf8');
return applyPragmas(source, {
define: [
"uniform lowp float a_{name}_t;",
"attribute {precision} {a_type} a_{name};",
"varying {precision} {type} {name};"
],
initialize: [
"{name} = unpack_mix_{a_type}(a_{name}, a_{name}_t);"
]
});
}
let fragmentSource = fs.readFileSync(path.join(inputPath, shaderName + '.fragment.glsl'), 'utf8');
let vertexSource = fs.readFileSync(path.join(inputPath, shaderName + '.vertex.glsl'), 'utf8');
function fragmentSource() {
const source = fs.readFileSync(path.join(inputPath, shaderName + '.fragment.glsl'), 'utf8');
return applyPragmas(source, {
define: [
"varying {precision} {type} {name};"
],
initialize: [
]
});
}
fragmentSource = fragmentSource.replace(re, (match, operation, precision, type, name) => {
fragmentPragmas.add(name);
return operation === "define" ?
`varying ${precision} ${type} ${name};` :
``;
});
vertexSource = vertexSource.replace(re, (match, operation, precision, type, name) => {
const a_type = type === "float" ? "vec2" : "vec4";
if (fragmentPragmas.has(name)) {
return operation === "define" ?
`uniform lowp float a_${name}_t;\nattribute ${precision} ${a_type} a_${name};\nvarying ${precision} ${type} ${name};` :
`${name} = unpack_mix_${a_type}(a_${name}, a_${name}_t);`;
} else {
return operation === "define" ?
`uniform lowp float a_${name}_t;\nattribute ${precision} ${a_type} a_${name};` :
`${precision} ${type} ${name} = unpack_mix_${a_type}(a_${name}, a_${name}_t);`;
}
});
writeIfModified(path.join(outputPath, `${shaderName}.hpp`), `// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
@@ -125,10 +114,10 @@ namespace shaders {
const char* ${shaderName}::name = "${shaderName}";
const char* ${shaderName}::vertexSource = R"MBGL_SHADER(
${vertexSource()}
${vertexSource}
)MBGL_SHADER";
const char* ${shaderName}::fragmentSource = R"MBGL_SHADER(
${fragmentSource()}
${fragmentSource}
)MBGL_SHADER";
} // namespace shaders