vrs_metaltest.mm - mozsearch

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// Copyright (C) 2024 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <Metal/Metal.h>

#include <rhi/qrhi.h>

void *makeRateMap(QRhi *rhi, const QSize &outputSizeInPixels)

    // note that multiview needs two layers, this example only uses one

    MTLDevice *dev = static_cast<const QRhiMetalNativeHandles *>(rhi->nativeHandles())->dev;

    MTLRasterizationRateMapDescriptor *descriptor = [[MTLRasterizationRateMapDescriptor alloc] init];

    descriptor.screenSize = MTLSizeMake(outputSizeInPixels.width(), outputSizeInPixels.height(), 1);

    MTLSize zoneCounts = MTLSizeMake(8, 8, 1);

    MTLRasterizationRateLayerDescriptor *layerDescriptor = [[MTLRasterizationRateLayerDescriptor alloc] initWithSampleCount:zoneCounts];

    for (uint row = 0; row < zoneCounts.height; row++)

        layerDescriptor.verticalSampleStorage[row] = 1.0;

    for (uint column = 0; column < zoneCounts.width; column++)

        layerDescriptor.horizontalSampleStorage[column] = 1.0;

    layerDescriptor.horizontalSampleStorage[0] = 0.25;

    layerDescriptor.horizontalSampleStorage[7] = 0.25;

    layerDescriptor.verticalSampleStorage[0] = 0.25;

    layerDescriptor.verticalSampleStorage[7] = 0.25;

    [descriptor setLayer:layerDescriptor atIndex:0];

    id<MTLRasterizationRateMap> rateMap = [dev newRasterizationRateMapWithDescriptor: descriptor];

    return rateMap;

void releaseRateMap(void *map)

    id<MTLRasterizationRateMap> rateMap = (id<MTLRasterizationRateMap>) map;

    [rateMap release];