31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
// Colour Sine wave Kernal
|
|
// Based on kernal_colour in kernelVBO.cpp by Rob Farber
|
|
__global__ void kernel(float4* dVertexArray, uchar4 *dColorArray,
|
|
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;
|
|
|
|
// Each thread is unique point (u,v) in interval [-1,1],[-1,1]
|
|
const float u = 2.0f* (x/(float)width) - 1.0f;
|
|
const float v = 2.0f* (y/(float)height) - 1.0f;
|
|
const float w = 0.5f * sinf(4.0f*u + time) * cosf(4.0f*v + time);
|
|
|
|
// Update vertex array for point
|
|
dVertexArray[y*width+x] = make_float4(u, w, v, 1.0f);
|
|
|
|
// Update colour array for point
|
|
dColorArray[y*width+x].w = 0.0f;
|
|
dColorArray[y*width+x].x = 255.0f *0.5f*(1.f+sinf(w+x));
|
|
dColorArray[y*width+x].y = 255.0f *0.5f*(1.f+sinf(x)*cosf(y));
|
|
dColorArray[y*width+x].z = 255.0f *0.5f*(1.f+sinf(w+time/10.0f));
|
|
}
|
|
|
|
extern "C" void launch_kernel(float4* dVertexArray, uchar4* dColourArray,
|
|
unsigned int width, unsigned int height, float time)
|
|
{
|
|
dim3 block(8, 8, 1);
|
|
dim3 grid(width / block.x, height / block.y, 1);
|
|
kernel<<< grid, block>>>(dVertexArray, dColourArray, width, height, time);
|
|
}
|