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light: debug code for dumping lightmaps to .ppm images

This commit is contained in:
Eric Wasylishen 2017-02-07 18:35:29 -07:00
parent 4582637c78
commit 613d75ea70
1 changed files with 39 additions and 0 deletions
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39
light/ltface.cc
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@ -2176,6 +2176,45 @@ Lightmap_MaxBrightness(const lightmap_t *lm, const lightsurf_t *lightsurf) {
return maxb;
}
static void
WritePPM(FILE *file, int width, int height, const uint8_t *rgbdata)
{
// see: http://netpbm.sourceforge.net/doc/ppm.html
fprintf(file, "P6 %d %d 255 ", width, height);
int bytes = width*height*3;
Q_assert(bytes == fwrite(rgbdata, 1, bytes, file));
}
static void
DumpFullSizeLightmap(const bsp2_t *bsp, const lightsurf_t *lightsurf)
{
const lightmap_t *lm = Lightmap_ForStyle_ReadOnly(lightsurf, 0);
if (lm != nullptr) {
int fnum = Face_GetNum(bsp, lightsurf->face);
char fname[1024];
sprintf(fname, "face%04d.ppm", fnum);
std::vector<uint8_t> rgbdata;
for (int i=0; i<lightsurf->numpoints; i++) {
const vec_t *color = lm->samples[i].color;
for (int j=0; j<3; j++) {
int intval = static_cast<int>(glm::clamp(color[j], 0.0f, 255.0f));
rgbdata.push_back(static_cast<uint8_t>(intval));
}
}
const int oversampled_width = (lightsurf->texsize[0] + 1) * oversample;
const int oversampled_height = (lightsurf->texsize[1] + 1) * oversample;
Q_assert(lightsurf->numpoints == (oversampled_height * oversampled_width));
FILE *file = fopen(fname, "wb");
WritePPM(file, oversampled_width, oversampled_height, rgbdata.data());
fclose(file);
}
}
static void
WriteLightmaps(const bsp2_t *bsp, bsp2_dface_t *face, facesup_t *facesup, const lightsurf_t *lightsurf,
const lightmapdict_t *lightmaps)