cuda-samples/Samples/5_Domain_Specific/simpleD3D10Texture/texture_3d.cu
2022-01-13 11:35:24 +05:30

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/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
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* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* Paint a 3D texture with a gradient in X (blue) and Z (green), and have every
* other Z slice have full red.
*/
__global__ void cuda_kernel_texture_3d(unsigned char *surface, int width,
int height, int depth, size_t pitch,
size_t pitchSlice, float t) {
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
// in the case where, due to quantization into grids, we have
// more threads than pixels, skip the threads which don't
// correspond to valid pixels
if (x >= width || y >= height) return;
// walk across the Z slices of this texture. it should be noted that
// this is far from optimal data access.
for (int z = 0; z < depth; ++z) {
// get a pointer to this pixel
unsigned char *pixel = surface + z * pitchSlice + y * pitch + 4 * x;
pixel[0] = (unsigned char)(255.f * (0.5f + 0.5f *
cos(t + (x * x + y * y + z * z) * 0.0001f * 3.14f))); // red
pixel[1] = (unsigned char)(255.f * (0.5f + 0.5f *
sin(t + (x * x + y * y + z * z) * 0.0001f * 3.14f))); // green
pixel[2] = (unsigned char)0; // blue
pixel[3] = 255; // alpha
}
}
extern "C" void cuda_texture_3d(void *surface, int width, int height, int depth,
size_t pitch, size_t pitchSlice, float t) {
cudaError_t error = cudaSuccess;
dim3 Db = dim3(16, 16); // block dimensions are fixed to be 256 threads
dim3 Dg = dim3((width + Db.x - 1) / Db.x, (height + Db.y - 1) / Db.y);
cuda_kernel_texture_3d<<<Dg, Db>>>((unsigned char *)surface, width, height,
depth, pitch, pitchSlice, t);
error = cudaGetLastError();
if (error != cudaSuccess) {
printf("cuda_kernel_texture_3d() failed to launch error = %d\n", error);
}
}