File size: 3,094 Bytes
111ba01 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 |
// Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
//
// NVIDIA CORPORATION and its licensors retain all intellectual property
// and proprietary rights in and to this software, related documentation
// and any modifications thereto. Any use, reproduction, disclosure or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA CORPORATION is strictly prohibited.
#include "framework.h"
#include "texture.h"
//------------------------------------------------------------------------
// Mip stack construction and access helpers.
void raiseMipSizeError(NVDR_CTX_ARGS, const TextureKernelParams& p)
{
char buf[1024];
int bufsz = 1024;
std::string msg = "Mip-map size error - cannot downsample an odd extent greater than 1. Resize the texture so that both spatial extents are powers of two, or limit the number of mip maps using max_mip_level argument.\n";
int w = p.texWidth;
int h = p.texHeight;
bool ew = false;
bool eh = false;
msg += "Attempted mip stack construction:\n";
msg += "level width height\n";
msg += "----- ----- ------\n";
snprintf(buf, bufsz, "base %5d %5d\n", w, h);
msg += buf;
int mipTotal = 0;
int level = 0;
while ((w|h) > 1 && !(ew || eh)) // Stop at first impossible size.
{
// Current level.
level += 1;
// Determine if downsampling fails.
ew = ew || (w > 1 && (w & 1));
eh = eh || (h > 1 && (h & 1));
// Downsample.
if (w > 1) w >>= 1;
if (h > 1) h >>= 1;
// Append level size to error message.
snprintf(buf, bufsz, "mip %-2d ", level);
msg += buf;
if (ew) snprintf(buf, bufsz, " err ");
else snprintf(buf, bufsz, "%5d ", w);
msg += buf;
if (eh) snprintf(buf, bufsz, " err\n");
else snprintf(buf, bufsz, "%5d\n", h);
msg += buf;
}
NVDR_CHECK(0, msg);
}
int calculateMipInfo(NVDR_CTX_ARGS, TextureKernelParams& p, int* mipOffsets)
{
// No levels at all?
if (p.mipLevelLimit == 0)
{
p.mipLevelMax = 0;
return 0;
}
// Current level size.
int w = p.texWidth;
int h = p.texHeight;
int mipTotal = 0;
int level = 0;
int c = (p.boundaryMode == TEX_BOUNDARY_MODE_CUBE) ? (p.channels * 6) : p.channels;
mipOffsets[0] = 0;
while ((w|h) > 1)
{
// Current level.
level += 1;
// Quit if cannot downsample.
if ((w > 1 && (w & 1)) || (h > 1 && (h & 1)))
raiseMipSizeError(NVDR_CTX_PARAMS, p);
// Downsample.
if (w > 1) w >>= 1;
if (h > 1) h >>= 1;
mipOffsets[level] = mipTotal; // Store the mip offset (#floats).
mipTotal += w * h * p.texDepth * c;
// Hit the level limit?
if (p.mipLevelLimit >= 0 && level == p.mipLevelLimit)
break;
}
p.mipLevelMax = level;
return mipTotal;
}
//------------------------------------------------------------------------
|