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Use one dither offset per block.

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This commit is contained in:
Steven Robertson 2011-10-15 00:29:22 -04:00
parent 83670df2c7
commit dd645bcbf6
2 changed files with 17 additions and 18 deletions
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28
cuburn/code/iter.py
View File

@ -110,6 +110,16 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
cosel[threadIdx.x] = mwc_next_01(rctx);
{{endif}}
if (threadIdx.y == 1 && threadIdx.x == 0) {
float ditherwidth = {{packer.get("0.33 * cp.spatial_filter_radius")}};
float u0 = mwc_next_01(rctx);
float r = ditherwidth * sqrt(-2.0f * log2f(u0) / M_LOG2E);
float u1 = 2.0f * M_PI * mwc_next_01(rctx);
info.cam_xo += r * cos(u1);
info.cam_yo += r * sin(u1);
}
__syncthreads();
int consec_bad = -{{features.fuse}};
@ -197,21 +207,9 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
{{apply_affine('x', 'y', 'cx', 'cy', packer,
'cp.camera_transform', 'cam')}}
{{endif}}
uint32_t ix = trunca(cx), iy = trunca(cy);
// TODO: verify that constants get premultiplied
float ditherwidth = {{packer.get("0.33 * cp.spatial_filter_radius")}};
float u0 = mwc_next_01(rctx);
float r = ditherwidth * sqrt(-2.0f * log2f(u0) / M_LOG2E);
// TODO: provide mwc_next_0_2pi()
float u1 = 2.0f * M_PI * mwc_next_01(rctx);
float ditherx = r * cos(u1);
float dithery = r * sin(u1);
int ix = trunca(cx+ditherx), iy = trunca(cy+dithery);
if (ix < 0 || ix >= {{features.acc_width}} ||
iy < 0 || iy >= {{features.acc_height}} ) {
if (ix >= {{features.acc_width}} || iy >= {{features.acc_height}} ) {
consec_bad++;
if (consec_bad > {{features.max_oob}}) {
x = mwc_next_11(rctx);
@ -222,7 +220,7 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
continue;
}
int i = iy * {{features.acc_stride}} + ix;
uint32_t i = iy * {{features.acc_stride}} + ix;
float4 outcol = tex2D(palTex, color, {{packer.get("cp_step_frac")}});
float4 pix = accbuf[i];

7
cuburn/code/util.py
View File

@ -89,9 +89,10 @@ uint32_t gtid() {
}
__device__
int trunca(float f) {
// truncate as used in address calculations
int ret;
uint32_t trunca(float f) {
// truncate as used in address calculations. note the use of a signed
// conversion is intentional here (simplifies image bounds checking).
uint32_t ret;
asm("cvt.rni.s32.f32 %0, %1;" : "=r"(ret) : "f"(f));
return ret;
}