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Optimize .hdr loading and RGB9E5 conversion

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This commit is contained in:
BlueCube3310
2024-08-08 19:13:00 +02:00
parent 739019e4e4
commit 80cf6cbfe9
3 changed files with 55 additions and 31 deletions
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32
modules/hdr/image_loader_hdr.cpp
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@@ -68,9 +68,11 @@ Error ImageLoaderHDR::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField
imgdata.resize(height * width * (int)sizeof(uint32_t));
{
uint8_t *w = imgdata.ptrw();
uint8_t *ptr = imgdata.ptrw();
uint8_t *ptr = (uint8_t *)w;
Vector<uint8_t> temp_read_data;
temp_read_data.resize(128);
uint8_t *temp_read_ptr = temp_read_data.ptrw();
if (width < 8 || width >= 32768) {
// Read flat data
@@ -113,8 +115,9 @@ Error ImageLoaderHDR::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField
}
} else {
// Dump
f->get_buffer(temp_read_ptr, count);
for (int z = 0; z < count; ++z) {
ptr[(j * width + i++) * 4 + k] = f->get_8();
ptr[(j * width + i++) * 4 + k] = temp_read_ptr[z];
}
}
}
@@ -122,20 +125,27 @@ Error ImageLoaderHDR::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField
}
}
const bool force_linear = p_flags & FLAG_FORCE_LINEAR;
//convert
for (int i = 0; i < width * height; i++) {
float exp = pow(2.0f, ptr[3] - 128.0f);
int e = ptr[3] - 128;
Color c(
ptr[0] * exp / 255.0,
ptr[1] * exp / 255.0,
ptr[2] * exp / 255.0);
if (force_linear || (e < -15 || e > 15)) {
float exp = pow(2.0f, e);
Color c(ptr[0] * exp / 255.0, ptr[1] * exp / 255.0, ptr[2] * exp / 255.0);
if (p_flags & FLAG_FORCE_LINEAR) {
c = c.srgb_to_linear();
if (force_linear) {
c = c.srgb_to_linear();
}
*(uint32_t *)ptr = c.to_rgbe9995();
} else {
// https://github.com/george-steel/rgbe-rs/blob/e7cc33b7f42b4eb3272c166dac75385e48687c92/src/types.rs#L123-L129
uint32_t e5 = (uint32_t)(e + 15);
*(uint32_t *)ptr = ((e5 << 27) | ((uint32_t)ptr[2] << 19) | ((uint32_t)ptr[1] << 10) | ((uint32_t)ptr[0] << 1));
}
*(uint32_t *)ptr = c.to_rgbe9995();
ptr += 4;
}
}