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62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
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#include "PackedFloat.h"
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#include "Vector.inl"
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#include "ftoi.h"
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using namespace nv;
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Vector3 nv::rgb9e5_to_vector3(FloatRGB9E5 v) {
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}
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FloatRGB9E5 nv::vector3_to_rgb9e5(const Vector3 & v) {
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}
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float nv::float11_to_float32(uint v) {
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}
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float nv::float10_to_float32(uint v) {
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}
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Vector3 nv::r11g11b10_to_vector3(FloatR11G11B10 v) {
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}
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FloatR11G11B10 nv::vector3_to_r11g11b10(const Vector3 & v) {
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}
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// These are based on:
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// http://www.graphics.cornell.edu/~bjw/rgbe/rgbe.c
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// While this may not be the best way to encode/decode RGBE8, I'm not making any changes to maintain compatibility.
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FloatRGBE8 nv::vector3_to_rgbe8(const Vector3 & v) {
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float m = max3(v.x, v.y, v.z);
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FloatRGBE8 rgbe;
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if (m < 1e-32) {
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rgbe.v = 0;
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}
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else {
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int e;
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float scale = frexpf(m, &e) * 256.0f / m;
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rgbe.r = U8(ftoi_round(v.x * scale));
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rgbe.g = U8(ftoi_round(v.y * scale));
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rgbe.b = U8(ftoi_round(v.z * scale));
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rgbe.e = U8(e + 128);
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}
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return rgbe;
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}
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Vector3 nv::rgbe8_to_vector3(FloatRGBE8 v) {
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if (v.e != 0) {
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float scale = ldexpf(1.0f, v.e-(int)(128+8)); // +8 to divide by 256. @@ Shouldn't we divide by 255 instead?
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return scale * Vector3(float(v.r), float(v.g), float(v.b));
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}
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return Vector3(0);
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}
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