cuda-samples/Samples/simpleD3D9/simpleD3D9_kernel.cu
2021-10-21 16:34:49 +05:30

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/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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// This example demonstrates how to use the CUDA Direct3D bindings with the
// runtime API.
// Device code.
#ifndef _SIMPLED3D_KERNEL_CU_
#define _SIMPLED3D_KERNEL_CU_
// includes, C string library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
///////////////////////////////////////////////////////////////////////////////
//! Simple kernel to modify vertex positions in sine wave pattern
//! @param pos pos in global memory
///////////////////////////////////////////////////////////////////////////////
__global__ void kernel(float4 *pos, unsigned int width, unsigned int height,
float time) {
unsigned int x = blockIdx.x * blockDim.x + threadIdx.x;
unsigned int y = blockIdx.y * blockDim.y + threadIdx.y;
// calculate uv coordinates
float u = x / (float)width;
float v = y / (float)height;
u = u * 2.0f - 1.0f;
v = v * 2.0f - 1.0f;
// calculate simple sine wave pattern
float freq = 4.0f;
float w = sinf(u * freq + time) * cosf(v * freq + time) * 0.5f;
// write output vertex
pos[y * width + x] = make_float4(u, w, v, __int_as_float(0xff00ff00));
}
extern "C" void simpleD3DKernel(float4 *pos, unsigned int width,
unsigned int height, float time) {
cudaError_t error = cudaSuccess;
dim3 block(8, 8, 1);
dim3 grid(width / block.x, height / block.y, 1);
kernel<<<grid, block>>>(pos, width, height, time);
error = cudaGetLastError();
if (error != cudaSuccess) {
printf("kernel() failed to launch error = %d\n", error);
}
}
#endif // #ifndef _SIMPLED3D_KERNEL_CU_