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Add gamma linearization (may be incorrect)

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This commit is contained in:
Steven Robertson 2011-06-11 17:50:15 -04:00
parent 5b67ed7c33
commit 38fbc391e8
2 changed files with 18 additions and 10 deletions
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14
cuburn/code/filtering.py
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@ -4,8 +4,10 @@ from cuburn.code.util import *
class ColorClip(HunkOCode): class ColorClip(HunkOCode):
defs = """ defs = """
__global__ __global__
void colorclip(float4 *pixbuf, float gamma, float vibrancy, float highpow) { void colorclip(float4 *pixbuf, float gamma, float vibrancy, float highpow,
// TODO: test if over an edge of the framebuffer float linrange, float lingam) {
// TODO: test if over an edge of the framebuffer - currently gutters are
// used and up to 256 pixels are ignored, which breaks when width<256
int i = blockDim.x * blockIdx.x + threadIdx.x; int i = blockDim.x * blockIdx.x + threadIdx.x;
float4 pix = pixbuf[i]; float4 pix = pixbuf[i];
@ -13,8 +15,12 @@ void colorclip(float4 *pixbuf, float gamma, float vibrancy, float highpow) {
float4 opix = pix; float4 opix = pix;
// TODO: linearized bottom range float alpha = pow(pix.w, gamma);
float alpha = powf(pix.w, gamma); if (pix.w < linrange) {
float frac = pix.w / linrange;
alpha = (1.0f - frac) * pix.w * lingam / linrange + frac * alpha;
}
float ls = vibrancy * alpha / pix.w; float ls = vibrancy * alpha / pix.w;
float maxc = fmaxf(pix.x, fmaxf(pix.y, pix.z)); float maxc = fmaxf(pix.x, fmaxf(pix.y, pix.z));

14
cuburn/render.py
View File

@ -308,16 +308,18 @@ class _AnimRenderer(object):
self.stream) self.stream)
self.stream.synchronize() self.stream.synchronize()
f = np.float32
n = np.float32(self.ncps) n = f(self.ncps)
gam = np.float32(n / gam) gam = f(n / gam)
vib = np.float32(vib / n) vib = f(vib / n)
hipow = np.float32(hipow / n) hipow = f(hipow / n)
lin = f(cen_cp.gam_lin_thresh)
lingam = f(math.pow(cen_cp.gam_lin_thresh, gam))
# TODO: get block size from colorclip class? It actually does not # TODO: get block size from colorclip class? It actually does not
# depend on that being the case # depend on that being the case
color_fun = a.mod.get_function("colorclip") color_fun = a.mod.get_function("colorclip")
color_fun(self.d_out, gam, vib, hipow, color_fun(self.d_out, gam, vib, hipow, lin, lingam,
block=(256, 1, 1), grid=(self.nbins / 256, 1), block=(256, 1, 1), grid=(self.nbins / 256, 1),
stream=self.stream) stream=self.stream)