在以下金属性能着色器代码中:
#include <metal_stdlib>
#include <simd/simd.h>
using namespace metal;
struct MeshVertex
{
half3 worldPosition3d;
half2 cameraPosition2d;
};
kernel void MeshImageblockShader_kernelFunction(
imageblock<MeshVertex> meshVertex_imageblock,
texture2d<float, access::read_write> trueDepthTexture [[ texture(0) ]],
constant float3x3& positionInThreadgroup [[ thread_position_in_threadgroup ]],
ushort2 positionInGrid [[ threadgroup_position_in_grid ]])
{
threadgroup_imageblock MeshVertex* meshVertex_threadgroupImageblock = meshVertex_imageblock.data(positionInThreadgroup);
imageblock_slice<half3> worldPosition3d_slice = meshVertex_imageblock.slice(meshVertex_threadgroupImageblock->worldPosition3d);
}
我在最后一个代码行收到两个错误:
(!) implicit instantiation of undefined template 'metal::imageblock_slice<half __attribute__((ext_vector_type(3))), metal::imageblock_layout_explicit, void>'
(!) too few template arguments for class template 'imageblock_slice'
我正在尝试遵循https://developer.apple.com/videos/play/tech-talks/603/上“Metal 2 on a!! - Imageblocks”的技术谈话示例 (代码示例在 3 :25 进入视频。)
我无法使用图像块在互联网上找到任何代码示例。
谁能建议一些示例代码,或者告诉我为什么不编译?