mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-24 18:29:14 +08:00
79 lines
3.4 KiB
Plaintext
79 lines
3.4 KiB
Plaintext
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * 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
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* 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
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
|
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#define PI 3.1415926536f
|
|
|
|
/*
|
|
* Paint a 2D texture with a moving red/green hatch pattern on a
|
|
* strobing blue background. Note that this kernel reads to and
|
|
* writes from the texture, hence why this texture was not mapped
|
|
* as WriteDiscard.
|
|
*/
|
|
__global__ void cuda_kernel_texture_2d(unsigned char *surface, int width,
|
|
int height, size_t pitch, float t) {
|
|
int x = blockIdx.x * blockDim.x + threadIdx.x;
|
|
int y = blockIdx.y * blockDim.y + threadIdx.y;
|
|
float *pixel;
|
|
|
|
// 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;
|
|
|
|
// get a pointer to the pixel at (x,y)
|
|
pixel = (float *)(surface + y * pitch) + 4 * x;
|
|
|
|
// populate it
|
|
float value_x = 0.5f + 0.5f * cos(t + 10.0f * ((2.0f * x) / width - 1.0f));
|
|
float value_y = 0.5f + 0.5f * cos(t + 10.0f * ((2.0f * y) / height - 1.0f));
|
|
pixel[0] = 0.5 * pixel[0] + 0.5 * pow(value_x, 3.0f); // red
|
|
pixel[1] = 0.5 * pixel[1] + 0.5 * pow(value_y, 3.0f); // green
|
|
pixel[2] = 0.5f + 0.5f * cos(t); // blue
|
|
pixel[3] = 1; // alpha
|
|
}
|
|
|
|
extern "C" void cuda_texture_2d(void *surface, int width, int height,
|
|
size_t pitch, 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_2d<<<Dg, Db>>>((unsigned char *)surface, width, height,
|
|
pitch, t);
|
|
|
|
error = cudaGetLastError();
|
|
|
|
if (error != cudaSuccess) {
|
|
printf("cuda_kernel_texture_2d() failed to launch error = %d\n", error);
|
|
}
|
|
}
|