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foreach[_tiled] seems to work now

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Evghenii
2013-11-14 16:29:40 +01:00
parent 48644813d4
commit af75afeb7a
5 changed files with 164 additions and 95 deletions
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78
examples_cuda/volume_rendering/volume1.ispc
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@@ -278,44 +278,54 @@ volume_tile(uniform int x0, uniform int y0, uniform int x1,
const uniform float raster2camera[4][4],
const uniform float camera2world[4][4],
uniform int width, uniform int height, uniform float image[]) {
// Work on 4x4=16 pixel big tiles of the image. This function thus
// implicitly assumes that both (x1-x0) and (y1-y0) are evenly divisble
// by 4.
for (uniform int y = y0; y < y1; y += 8) {
for (uniform int x = x0; x < x1; x += 8) {
// foreach (o = 0 ... 16) {
for (uniform int ob = 0; ob < 64; ob += programCount)
{
const int o = ob + programIndex;
// These two arrays encode the mapping from [0,15] to
// offsets within the 4x4 pixel block so that we render
// each pixel inside the block
const uniform int xoffsets[16] = { 0, 1, 0, 1, 2, 3, 2, 3,
0, 1, 0, 1, 2, 3, 2, 3 };
const uniform int yoffsets[16] = { 0, 0, 1, 1, 0, 0, 1, 1,
2, 2, 3, 3, 2, 2, 3, 3 };
// Work on 4x4=16 pixel big tiles of the image. This function thus
// implicitly assumes that both (x1-x0) and (y1-y0) are evenly divisble
// by 4.
#if 0
for (uniform int y = y0; y < y1; y += 8)
for (uniform int x = x0; x < x1; x += 8)
foreach (o = 0 ... 64)
{
// These two arrays encode the mapping from [0,15] to
// offsets within the 4x4 pixel block so that we render
// each pixel inside the block
const uniform int xoffsets[16] = { 0, 1, 0, 1, 2, 3, 2, 3,
0, 1, 0, 1, 2, 3, 2, 3 };
const uniform int yoffsets[16] = { 0, 0, 1, 1, 0, 0, 1, 1,
2, 2, 3, 3, 2, 2, 3, 3 };
const uniform int xblock[4] = {0, 4, 0, 4};
const uniform int yblock[4] = {0, 0, 4, 4};
const uniform int xblock[4] = {0, 4, 0, 4};
const uniform int yblock[4] = {0, 0, 4, 4};
// Figure out the pixel to render for this program instance
const int xo = x + xblock[o/16] + xoffsets[o&15];
const int yo = y + yblock[o/16] + yoffsets[o&15];
// Figure out the pixel to render for this program instance
const int xo = x + xblock[o/16] + xoffsets[o&15];
const int yo = y + yblock[o/16] + yoffsets[o&15];
// Use viewing parameters to compute the corresponding ray
// for the pixel
Ray ray;
generateRay(raster2camera, camera2world, xo, yo, ray);
// Use viewing parameters to compute the corresponding ray
// for the pixel
Ray ray;
generateRay(raster2camera, camera2world, xo, yo, ray);
// And raymarch through the volume to compute the pixel's
// value
int offset = yo * width + xo;
if (xo < x1 && yo < y1)
image[offset] = raymarch(density, nVoxels, ray);
}
}
}
// And raymarch through the volume to compute the pixel's
// value
int offset = yo * width + xo;
if (xo < x1 && yo < y1)
image[offset] = raymarch(density, nVoxels, ray);
}
#else
foreach_tiled (y = y0 ... y1, x = x0 ... x1)
{
// Use viewing parameters to compute the corresponding ray
// for the pixel
Ray ray;
generateRay(raster2camera, camera2world, x, y, ray);
// And raymarch through the volume to compute the pixel's
// value
int offset = y * width + x;
image[offset] = raymarch(density, nVoxels, ray);
}
#endif
}