Hello,
my purpose is to use CUDA through a stub library, which encapsulates CUDA specific functions, methods and data. This library will reside inside a dll file and it will be used dynamically via LoadLibrary and GetProcAddress Windows API functions. I am using Visual Studio 2010 C++ compiler to create CUDA dll, but the rest is done by another compiler. That means, that I cannot use heap memory (ie. malloc, new or anything, which lives outside stack memory. Even global variables cause memory corruption) inside CUDA dll, so it is literally a stub library.
However, first I want to code a test program: CUDAhost.exe and CUDAdevice.dll, which both are compiled by Visual Studio 2010. This program draws a texture to the screen, but first the image data is copied from readGLTexture to viewGLTexture by CUDA. My problem is I cannot get the program working, the window is black. I cannot find the error. I’m not sure is this possible at all or should I choose completely different solution. I hope you can help me. Any suggestions are appreciated. Below is the source code:
CUDAhost.cpp:
#include "stdafx.h"
const unsigned int window_width = 512;
const unsigned int window_height = 512;
GLuint viewGLTexture;
GLuint readGLTexture;
void* cViewCudaResource;
void* cReadCudaResource;
HINSTANCE dll;
typedef void (*KAYNNISTACUDA)(unsigned int& readGLTexture, void* &cReadCudaResource, unsigned int& viewGLTexture, void* &cViewCudaResource);
KAYNNISTACUDA kaynnistaCUDA;
typedef void (*PIIRRAKUVA)(void* &cReadCudaResource, void* &cViewCudaResource);
PIIRRAKUVA piirraKuva;
bool lataaTekstuuri(const wchar_t* tiedosto, GLuint& numero) {
FILE* tiedostosta;
BITMAPFILEHEADER bitmapFileHeader;
BITMAPINFOHEADER bitmapInfoHeader;
unsigned char *bittiKartta;
unsigned char siirto;
wchar_t polku[45]={0};
int leveys;
int korkeus;
//prepare file path
wcsncat(polku, L"Tekstuurit\\", 45);
wcsncat(polku, tiedosto, 45);
wcsncat(polku, L".bmp", 45);
//open BMP file
tiedostosta=_wfopen(polku, L"rb");
if (tiedostosta==NULL) {
return false;
}
//read bmp file header and sequre it is bmp file
fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER), 1, tiedostosta);
if (bitmapFileHeader.bfType != 0x4D42) {
fclose(tiedostosta);
return false;
}
//read bmp info header and move to the beginning of image data
fread(&bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, tiedostosta);
fseek(tiedostosta, bitmapFileHeader.bfOffBits, SEEK_SET);
//allocate memory space
bittiKartta=(unsigned char*)malloc(bitmapInfoHeader.biSizeImage);
if (!bittiKartta) {
free(bittiKartta);
bittiKartta=NULL;
fclose(tiedostosta);
return false;
}
//read image
fread(bittiKartta, 1, bitmapInfoHeader.biSizeImage, tiedostosta);
if (bittiKartta==NULL) {
free(bittiKartta);
bittiKartta=NULL;
fclose(tiedostosta);
return false;
}
//rearrange bgr to rgb
for (int i=0; i<bitmapInfoHeader.biSizeImage; i+=3) {
siirto=bittiKartta[i];
bittiKartta[i]=bittiKartta[i+2];
bittiKartta[i+2]=siirto;
}
//query image width and height
leveys=bitmapInfoHeader.biWidth;
korkeus=abs(bitmapInfoHeader.biHeight);
//close bmp file
fclose(tiedostosta);
glGetError();
//create OpenGL texture
glGenTextures(1, &numero);
glBindTexture(GL_TEXTURE_2D, numero);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, leveys, korkeus, 0, GL_RGB, GL_UNSIGNED_BYTE, bittiKartta);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
//free temporary buffer
free(bittiKartta);
bittiKartta=NULL;
//if success, return true
if (0==glGetError()) {
return true;
} else {
return false;
}
}
void initGLandCUDA(int argc, char* argv[]) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA);
glutInitWindowSize(window_width, window_height);
glutCreateWindow("CUDA GL Interop");
glewInit();
glEnable(GL_TEXTURE_2D);
bool onnistuiko=lataaTekstuuri(L"Tex", readGLTexture);
glGenTextures(1, &viewGLTexture);
glBindTexture(GL_TEXTURE_2D, viewGLTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, window_width, window_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
dll=LoadLibraryW(L"CUDAdevice.dll");
if (dll) {
kaynnistaCUDA=(KAYNNISTACUDA)GetProcAddress(dll, "kaynnistaCUDA");
kaynnistaCUDA(readGLTexture, cReadCudaResource, viewGLTexture, cViewCudaResource);
}
}
void renderFrame() {
if (dll) {
piirraKuva=(PIIRRAKUVA)GetProcAddress(dll, "piirraKuva");
piirraKuva(cReadCudaResource, cViewCudaResource);
}
glBindTexture(GL_TEXTURE_2D, viewGLTexture);
{
glBegin(GL_QUADS);
{
glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex2f(+1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f(+1.0f, +1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, +1.0f);
}
glEnd();
}
glBindTexture(GL_TEXTURE_2D, 0);
glFinish();
}
int _tmain(int argc, _TCHAR* argv[])
{
initGLandCUDA(argc, reinterpret_cast<char**>(argv));
glutDisplayFunc(renderFrame);
glutMainLoop();
return 0;
}
dllmain.cpp:
#include "stdafx.h"
BOOL APIENTRY DllMain( HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
//this function is used to setup CUDA
void kaynnistaCUDA(unsigned int& readGLTexture, void* &cReadCudaResource, unsigned int& viewGLTexture, void* &cViewCudaResource) {
struct cudaGraphicsResource* viewCudaResource;
struct cudaGraphicsResource* readCudaResource;
cudaError cVirhe;
cudaGLSetGLDevice(0);
cVirhe=cudaGraphicsGLRegisterImage(&viewCudaResource, viewGLTexture, GL_TEXTURE_2D, cudaGraphicsRegisterFlagsReadOnly);
cVirhe=cudaGraphicsGLRegisterImage(&readCudaResource, readGLTexture, GL_TEXTURE_2D, cudaGraphicsRegisterFlagsSurfaceLoadStore);
cReadCudaResource=reinterpret_cast<void*>(readCudaResource);
cViewCudaResource=reinterpret_cast<void*>(viewCudaResource);
}
//this function is used to draw texture image via CUDA
void piirraKuva(void* &cReadCudaResource, void* &cViewCudaResource) {
cudaError cVirhe;
struct cudaGraphicsResource* viewCudaResource=reinterpret_cast<cudaGraphicsResource*>(cReadCudaResource);
struct cudaGraphicsResource* readCudaResource=reinterpret_cast<cudaGraphicsResource*>(cViewCudaResource);
cudaArray *readCudaArray;
cudaArray *viewCudaArray;
cVirhe=cudaGraphicsMapResources(1, &readCudaResource);
cVirhe=cudaGraphicsMapResources(1, &viewCudaResource);
cVirhe=cudaGraphicsSubResourceGetMappedArray(&readCudaArray, readCudaResource, 0, 0);
cVirhe=cudaGraphicsSubResourceGetMappedArray(&viewCudaArray, viewCudaResource, 0, 0);
callCUDAKernel(readCudaArray, viewCudaArray);
cudaGraphicsUnmapResources(1, &viewCudaResource);
cudaStreamSynchronize(0);
}
ohjelmat.cu:
#include "stdafx.h"
#include "ohjelmat.h"
texture<uchar4, cudaTextureType2D, cudaReadModeElementType> readCudaTextureObject;
surface<void, cudaSurfaceType2D> viewCudaSurfaceObject;
__global__ void renderingKernel() {
unsigned int x = blockIdx.x * blockDim.x + threadIdx.x;
unsigned int y = blockIdx.y * blockDim.y + threadIdx.y;
uchar4 dd=tex2D(readCudaTextureObject, x, y);
surf2Dwrite(dd, viewCudaSurfaceObject, x*sizeof(dd), y, cudaBoundaryModeZero);
}
void callCUDAKernel(cudaArray *readCudaArray, cudaArray *viewCudaArray) {
cudaError cVirhe;
cVirhe=cudaBindTextureToArray(readCudaTextureObject, readCudaArray);
cVirhe=cudaBindSurfaceToArray(viewCudaSurfaceObject, viewCudaArray);
dim3 block(256, 1, 1);
dim3 grid(2, 512, 1);
renderingKernel<<<grid, block>>>();
cudaPeekAtLastError();
cudaDeviceSynchronize();
}
PS. Don’t worry about lataaTekstuuri(const wchar_t* tiedosto, GLuint& numero) function. I know it works. I also have set paths to cuda headers, libraries, sources and binaries, added cudart.lib to additional dependencies and set compute_20,sm_21.