declare const _default: "\n\nattribute vertex_position: vec2f;\n\n// Sub-draw data texture: RGBA32U\n// R = rowStart | (numRows << 16)\n// G = colStart\n// B = colEnd\n// A = sourceBase\nvar uSubDrawData: texture_2d<u32>;\nuniform uTextureSize: vec2i;  // (width, height)\nuniform uSubDrawBase: i32;\n\n// packed sub-draw params: (sourceBase, colStart, rowWidth, rowStart)\nvarying @interpolate(flat) vSubDraw: vec4i;\n\n@vertex\nfn vertexMain(input: VertexInput) -> VertexOutput {\n    var output: VertexOutput;\n\n    // Read sub-draw parameters from 2D data texture\n    let subDrawWidth = i32(textureDimensions(uSubDrawData, 0).x);\n    let instIdx = i32(input.instanceIndex) + uniform.uSubDrawBase;\n    let data = textureLoad(uSubDrawData, vec2i(instIdx % subDrawWidth, instIdx / subDrawWidth), 0);\n    let rowStart = i32(data.r & 0xFFFFu);\n    let numRows = i32(data.r >> 16u);\n    let colStart = i32(data.g);\n    let colEnd = i32(data.b);\n    let sourceBase = i32(data.a);\n\n    // Quad corner from vertexIndex (0-3 via index buffer [0,1,2, 2,1,3])\n    let u = f32(i32(input.vertexIndex) & 1);       // 0 or 1 (left or right)\n    let v = f32(i32(input.vertexIndex) >> 1u);      // 0 or 1 (bottom or top)\n\n    // Map to NDC within the viewport\n    // WebGPU viewport transform inverts Y: y_pixel = viewport.y + viewport.h * (1 - y_ndc) / 2\n    // so we negate Y compared to the GLSL version to get correct row positioning\n    let ndc = vec4f(f32(colStart), f32(colEnd), f32(rowStart), f32(rowStart + numRows)) / vec4f(f32(uniform.uTextureSize.x), f32(uniform.uTextureSize.x), f32(uniform.uTextureSize.y), f32(uniform.uTextureSize.y)) * 2.0 - 1.0;\n\n    output.position = vec4f(mix(ndc.x, ndc.y, u), mix(-ndc.z, -ndc.w, v), 0.5, 1.0);\n\n    // Output packed flat varying: (sourceBase, colStart, rowWidth, rowStart)\n    output.vSubDraw = vec4i(sourceBase, colStart, colEnd - colStart, rowStart);\n\n    return output;\n}\n";
export default _default;