RenderScript：不匹配函数 rsGetElementAt_uchar4

Question

我写的 RS 很短，但在 gradle 同步后 Android Studio 给我错误

Error:(8, 34) error: no matching function for call to 'rsGetElementAt_uchar4'

脚本：

#pragma version(1)
#pragma rs java_package_name(xx.xxx.xxxxxxx)

uchar4 road = 0;
const uchar4 nothing = 0;

void init() {
    road.a = 0xff;
}

uchar4 __attribute__((kernel)) kernel(uchar4 original, uint32_t x, uint32_t y) {
    uchar4 masked = rsGetElementAt_uchar4(extra_alloc, x, y));
    if (original.r != masked.r || original.g != masked.g || original.b != masked.b) {
        return road;
    } else {
        return nothing;
    }
}

在build.gradle中：

defaultConfig {
    applicationId "xx.xxx.xxxxxxx"
    minSdkVersion 21
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"
    renderscriptTargetApi 24 // I've tried almost every possible value
    renderscriptSupportModeEnabled true
}

相同的代码，但使用 API 23 有效：

#pragma version(1)
#pragma rs java_package_name(gl.kid.maptilt)

uchar4 road = 0; // I don't know, how to declare uchar4, any advice?
const uchar4 nothing = 0;

void init() {
    road.a = 0xff;
}

uchar4 __attribute__((kernel)) root(uchar4 original, uchar4 masked, uint32_t x, uint32_t y) {
    if (original.r != masked.r || original.g != masked.g || original.b != masked.b) {
        return road;
    } else {
        return nothing;
    }
}

Answer 1

先声明一下，我对RenderScript了解不多。也就是说，我认为您遵循了类似于 this question 的代码，但您错过了这一行：

rs_allocation extra_alloc;

注意 Java 中设置的位：

script.set_extra_alloc(inAllocationExtra);

RenderScript：不匹配函数 rsGetElementAt_uchar4

RenderScript: not matching function rsGetElementAt_uchar4

android

renderscript

android-renderscript