3f56f1f9
 dmayerich
initial commit
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#define BREWER_CTRL_PTS 11
#ifdef __CUDACC__
texture<float4, cudaTextureType1D> cudaTexBrewer;
static cudaArray* gpuBrewer;
#endif
namespace rts{
namespace colormap{
enum colormapType {cmBrewer, cmGrayscale};
static void buffer2image(unsigned char* buffer, std::string filename, unsigned int x_size, unsigned int y_size)
{
//create an image object
QImage image(x_size, y_size, QImage::Format_RGB32);
int i;
unsigned char r, g, b;
unsigned int x, y;
for(y=0; y<y_size; y++)
for(x=0; x<x_size; x++)
{
//calculate the 1D index
i = y * x_size + x;
r = buffer[i * 3 + 0];
g = buffer[i * 3 + 1];
b = buffer[i * 3 + 2];
//set the image pixel
QColor color(r, g, b);
image.setPixel(x, y, color.rgb());
}
image.save(filename.c_str());
}
#ifdef __CUDACC__
static void initBrewer()
{
//initialize the Brewer colormap
//allocate CPU space
float4 cpuColorMap[BREWER_CTRL_PTS];
//define control rtsPoints
cpuColorMap[0] = make_float4(0.192157f, 0.211765f, 0.584314f, 1.0f);
cpuColorMap[1] = make_float4(0.270588f, 0.458824f, 0.705882f, 1.0f);
cpuColorMap[2] = make_float4(0.454902f, 0.678431f, 0.819608f, 1.0f);
cpuColorMap[3] = make_float4(0.670588f, 0.85098f, 0.913725f, 1.0f);
cpuColorMap[4] = make_float4(0.878431f, 0.952941f, 0.972549f, 1.0f);
cpuColorMap[5] = make_float4(1.0f, 1.0f, 0.74902f, 1.0f);
cpuColorMap[6] = make_float4(0.996078f, 0.878431f, 0.564706f, 1.0f);
cpuColorMap[7] = make_float4(0.992157f, 0.682353f, 0.380392f, 1.0f);
cpuColorMap[8] = make_float4(0.956863f, 0.427451f, 0.262745f, 1.0f);
cpuColorMap[9] = make_float4(0.843137f, 0.188235f, 0.152941f, 1.0f);
cpuColorMap[10] = make_float4(0.647059f, 0.0f, 0.14902f, 1.0f);
int width = BREWER_CTRL_PTS;
int height = 0;
// allocate array and copy colormap data
cudaChannelFormatDesc channelDesc = cudaCreateChannelDesc(32, 32, 32, 32, cudaChannelFormatKindFloat);
HANDLE_ERROR(cudaMallocArray(&gpuBrewer, &channelDesc, width, height));
HANDLE_ERROR(cudaMemcpyToArray(gpuBrewer, 0, 0, cpuColorMap, sizeof(float4)*width, cudaMemcpyHostToDevice));
// set texture parameters
cudaTexBrewer.addressMode[0] = cudaAddressModeClamp;
//texBrewer.addressMode[1] = cudaAddressModeClamp;
cudaTexBrewer.filterMode = cudaFilterModeLinear;
cudaTexBrewer.normalized = true; // access with normalized texture coordinates
// Bind the array to the texture
HANDLE_ERROR(cudaBindTextureToArray( cudaTexBrewer, gpuBrewer, channelDesc));
}
static void destroyBrewer()
{
HANDLE_ERROR(cudaFreeArray(gpuBrewer));
}
template<class T>
__global__ static void applyBrewer(T* gpuSource, unsigned char* gpuDest, unsigned int N, T minVal = 0, T maxVal = 1)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
//compute the normalized value on [minVal maxVal]
float a = (gpuSource[i] - minVal) / (maxVal - minVal);
//lookup the color
float shift = 1.0/BREWER_CTRL_PTS;
float4 color = tex1D(cudaTexBrewer, a+shift);
gpuDest[i * 3 + 0] = 255 * color.x;
gpuDest[i * 3 + 1] = 255 * color.y;
gpuDest[i * 3 + 2] = 255 * color.z;
}
template<class T>
__global__ static void applyGrayscale(T* gpuSource, unsigned char* gpuDest, unsigned int N, T minVal = 0, T maxVal = 1)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
//compute the normalized value on [minVal maxVal]
float a = (gpuSource[i] - minVal) / (maxVal - minVal);
gpuDest[i * 3 + 0] = 255 * a;
gpuDest[i * 3 + 1] = 255 * a;
gpuDest[i * 3 + 2] = 255 * a;
}
template<class T>
static void gpu2gpu(T* gpuSource, unsigned char* gpuDest, unsigned int nVals, T minVal = 0, T maxVal = 1, colormapType cm = cmGrayscale, int blockDim = 128)
{
//This function converts a scalar field on the GPU to a color image on the GPU
int gridDim = (nVals + blockDim - 1)/blockDim;
if(cm == cmGrayscale)
applyGrayscale<<<gridDim, blockDim>>>(gpuSource, gpuDest, nVals, minVal, maxVal);
else if(cm == cmBrewer)
{
initBrewer();
applyBrewer<<<gridDim, blockDim>>>(gpuSource, gpuDest, nVals, minVal, maxVal);
destroyBrewer();
}
}
template<class T>
static void gpu2cpu(T* gpuSource, unsigned char* cpuDest, unsigned int nVals, T minVal, T maxVal, colormapType cm = cmGrayscale)
{
//this function converts a scalar field on the GPU to a color image on the CPU
//first create the color image on the GPU
//allocate GPU memory for the color image
unsigned char* gpuDest;
HANDLE_ERROR(cudaMalloc( (void**)&gpuDest, sizeof(unsigned char) * nVals * 3 ));
//HANDLE_ERROR(cudaMemset(gpuSource, 0, sizeof(T) * nVals));
//create the image on the gpu
gpu2gpu(gpuSource, gpuDest, nVals, minVal, maxVal, cm);
//HANDLE_ERROR(cudaMemset(gpuDest, 0, sizeof(unsigned char) * nVals * 3));
//copy the image from the GPU to the CPU
HANDLE_ERROR(cudaMemcpy(cpuDest, gpuDest, sizeof(unsigned char) * nVals * 3, cudaMemcpyDeviceToHost));
HANDLE_ERROR(cudaFree( gpuDest ));
}
template<typename T>
static void gpu2image(T* gpuSource, std::string fileDest, unsigned int x_size, unsigned int y_size, T valMin, T valMax, colormapType cm = cmGrayscale)
{
//allocate a color buffer
unsigned char* cpuBuffer = (unsigned char*) malloc(sizeof(unsigned char) * 3 * x_size * y_size);
//do the mapping
gpu2cpu<T>(gpuSource, cpuBuffer, x_size * y_size, valMin, valMax, cm);
//copy the buffer to an image
buffer2image(cpuBuffer, fileDest, x_size, y_size);
free(cpuBuffer);
}
#endif
template<class T>
static void cpu2cpu(T* cpuSource, unsigned char* cpuDest, unsigned int nVals, T valMin, T valMax, colormapType cm = cmGrayscale)
{
int i;
float a;
float range = valMax - valMin;
for(i = 0; i<nVals; i++)
{
//normalize to the range [valMin valMax]
a = (cpuSource[i] - valMin) / range;
cpuDest[i * 3 + 0] = 255 * a;
cpuDest[i * 3 + 1] = 255 * a;
cpuDest[i * 3 + 2] = 255 * a;
}
}
template<typename T>
static void cpu2image(T* cpuSource, std::string fileDest, unsigned int x_size, unsigned int y_size, T valMin, T valMax, colormapType cm = cmGrayscale)
{
//allocate a color buffer
unsigned char* cpuBuffer = (unsigned char*) malloc(sizeof(unsigned char) * 3 * x_size * y_size);
//do the mapping
cpu2cpu<T>(cpuSource, cpuBuffer, x_size * y_size, valMin, valMax, cm);
//copy the buffer to an image
buffer2image(cpuBuffer, fileDest, x_size, y_size);
free(cpuBuffer);
}
}} //end namespace colormap and rts
#endif
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