The rgb9e5 format is a packed format defined in terms of slicing up a
single 32-bit value. The bitfields are far more confusing than simple
shifts and require that we check the endianness.
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
-typedef union {
- unsigned int raw;
- struct {
-#if defined(MESA_BIG_ENDIAN) || defined(PIPE_ARCH_BIG_ENDIAN)
- unsigned int biasedexponent:RGB9E5_EXPONENT_BITS;
- unsigned int b:RGB9E5_MANTISSA_BITS;
- unsigned int g:RGB9E5_MANTISSA_BITS;
- unsigned int r:RGB9E5_MANTISSA_BITS;
-#else
- unsigned int r:RGB9E5_MANTISSA_BITS;
- unsigned int g:RGB9E5_MANTISSA_BITS;
- unsigned int b:RGB9E5_MANTISSA_BITS;
- unsigned int biasedexponent:RGB9E5_EXPONENT_BITS;
-#endif
- } field;
-} rgb9e5;
-
-
static inline int rgb9e5_ClampRange(float x)
{
float754 f;
static inline int rgb9e5_ClampRange(float x)
{
float754 f;
-static inline unsigned float3_to_rgb9e5(const float rgb[3])
+static inline unsigned int float3_to_rgb9e5(const float rgb[3])
int rm, gm, bm, exp_shared;
float754 revdenom = {0};
float754 rc, bc, gc, maxrgb;
int rm, gm, bm, exp_shared;
float754 revdenom = {0};
float754 rc, bc, gc, maxrgb;
assert(gm >= 0);
assert(bm >= 0);
assert(gm >= 0);
assert(bm >= 0);
- retval.field.r = rm;
- retval.field.g = gm;
- retval.field.b = bm;
- retval.field.biasedexponent = exp_shared;
-
- return retval.raw;
+ return (exp_shared << 27) | (bm << 18) | (gm << 9) | rm;
}
static inline void rgb9e5_to_float3(unsigned rgb, float retval[3])
{
}
static inline void rgb9e5_to_float3(unsigned rgb, float retval[3])
{
int exponent;
float754 scale = {0};
int exponent;
float754 scale = {0};
- v.raw = rgb;
- exponent = v.field.biasedexponent - RGB9E5_EXP_BIAS - RGB9E5_MANTISSA_BITS;
+ exponent = (rgb >> 27) - RGB9E5_EXP_BIAS - RGB9E5_MANTISSA_BITS;
scale.field.biasedexponent = exponent + 127;
scale.field.biasedexponent = exponent + 127;
- retval[0] = v.field.r * scale.value;
- retval[1] = v.field.g * scale.value;
- retval[2] = v.field.b * scale.value;
+ retval[0] = ( rgb & 0x1ff) * scale.value;
+ retval[1] = ((rgb >> 9) & 0x1ff) * scale.value;
+ retval[2] = ((rgb >> 18) & 0x1ff) * scale.value;