From 0402d388cb9803652c0f9a52ba7dcb6029fdd0b9 Mon Sep 17 00:00:00 2001 From: marha Date: Sat, 30 Apr 2011 15:25:48 +0000 Subject: Added extra needed files --- .../gallium/auxiliary/util/u_format_r11g11b10f.h | 190 +++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 mesalib/src/gallium/auxiliary/util/u_format_r11g11b10f.h (limited to 'mesalib/src/gallium/auxiliary/util/u_format_r11g11b10f.h') diff --git a/mesalib/src/gallium/auxiliary/util/u_format_r11g11b10f.h b/mesalib/src/gallium/auxiliary/util/u_format_r11g11b10f.h new file mode 100644 index 000000000..e079b90b1 --- /dev/null +++ b/mesalib/src/gallium/auxiliary/util/u_format_r11g11b10f.h @@ -0,0 +1,190 @@ +/* + * Copyright (C) 2011 Marek Olšák + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/* Based on code from The OpenGL Programming Guide / 7th Edition, Appendix J. + * Available here: http://www.opengl-redbook.com/appendices/ + * The algorithm in the book contains a bug though, which is fixed in the code + * below. + */ + +#define UF11_EXPONENT_BIAS 15 +#define UF11_EXPONENT_BITS 0x1F +#define UF11_EXPONENT_SHIFT 6 +#define UF11_MANTISSA_BITS 0x3F +#define UF11_MANTISSA_SHIFT (23 - UF11_EXPONENT_SHIFT) +#define UF11_MAX_EXPONENT (UF11_EXPONENT_BITS << UF11_EXPONENT_SHIFT) + +#define UF10_EXPONENT_BIAS 15 +#define UF10_EXPONENT_BITS 0x1F +#define UF10_EXPONENT_SHIFT 5 +#define UF10_MANTISSA_BITS 0x3F +#define UF10_MANTISSA_SHIFT (23 - UF10_EXPONENT_SHIFT) +#define UF10_MAX_EXPONENT (UF10_EXPONENT_BITS << UF10_EXPONENT_SHIFT) + +#define F32_INFINITY 0x7f800000 + +static INLINE unsigned f32_to_uf11(float val) +{ + uint32_t f32 = (*(uint32_t *) &val); + uint16_t uf11 = 0; + + /* Decode little-endian 32-bit floating-point value */ + int sign = (f32 >> 16) & 0x8000; + /* Map exponent to the range [-127,128] */ + int exponent = ((f32 >> 23) & 0xff) - 127; + int mantissa = f32 & 0x007fffff; + + if (sign) return 0; + + if (exponent == 128) { /* Infinity or NaN */ + uf11 = UF11_MAX_EXPONENT; + if (mantissa) uf11 |= (mantissa & UF11_MANTISSA_BITS); + } + else if (exponent > 15) { /* Overflow - flush to Infinity */ + uf11 = UF11_MAX_EXPONENT; + } + else if (exponent > -15) { /* Representable value */ + exponent += UF11_EXPONENT_BIAS; + mantissa >>= UF11_MANTISSA_SHIFT; + uf11 = exponent << UF11_EXPONENT_SHIFT | mantissa; + } + + return uf11; +} + +static INLINE float uf11_to_f32(uint16_t val) +{ + union { + float f; + uint32_t ui; + } f32; + + int exponent = (val & 0x07c0) >> UF11_EXPONENT_SHIFT; + int mantissa = (val & 0x003f); + + f32.f = 0.0; + + if (exponent == 0) { + if (mantissa != 0) { + const float scale = 1.0 / (1 << 20); + f32.f = scale * mantissa; + } + } + else if (exponent == 31) { + f32.ui = F32_INFINITY | mantissa; + } + else { + float scale, decimal; + exponent -= 15; + if (exponent < 0) { + scale = 1.0 / (1 << -exponent); + } + else { + scale = 1 << exponent; + } + decimal = 1.0 + (float) mantissa / 64; + f32.f = scale * decimal; + } + + return f32.f; +} + +static INLINE unsigned f32_to_uf10(float val) +{ + uint32_t f32 = (*(uint32_t *) &val); + uint16_t uf10 = 0; + + /* Decode little-endian 32-bit floating-point value */ + int sign = (f32 >> 16) & 0x8000; + /* Map exponent to the range [-127,128] */ + int exponent = ((f32 >> 23) & 0xff) - 127; + int mantissa = f32 & 0x007fffff; + + if (sign) return 0; + + if (exponent == 128) { /* Infinity or NaN */ + uf10 = UF10_MAX_EXPONENT; + if (mantissa) uf10 |= (mantissa & UF10_MANTISSA_BITS); + } + else if (exponent > 15) { /* Overflow - flush to Infinity */ + uf10 = UF10_MAX_EXPONENT; + } + else if (exponent > -15) { /* Representable value */ + exponent += UF10_EXPONENT_BIAS; + mantissa >>= UF10_MANTISSA_SHIFT; + uf10 = exponent << UF10_EXPONENT_SHIFT | mantissa; + } + + return uf10; +} + +static INLINE float uf10_to_f32(uint16_t val) +{ + union { + float f; + uint32_t ui; + } f32; + + int exponent = (val & 0x07c0) >> UF10_EXPONENT_SHIFT; + int mantissa = (val & 0x003f); + + f32.f = 0.0; + + if (exponent == 0) { + if (mantissa != 0) { + const float scale = 1.0 / (1 << 20); + f32.f = scale * mantissa; + } + } + else if (exponent == 31) { + f32.ui = F32_INFINITY | mantissa; + } + else { + float scale, decimal; + exponent -= 15; + if (exponent < 0) { + scale = 1.0 / (1 << -exponent); + } + else { + scale = 1 << exponent; + } + decimal = 1.0 + (float) mantissa / 32; + f32.f = scale * decimal; + } + + return f32.f; +} + +static INLINE unsigned float3_to_r11g11b10f(const float rgb[3]) +{ + return ( f32_to_uf11(rgb[0]) & 0x7ff) | + ((f32_to_uf11(rgb[1]) & 0x7ff) << 11) | + ((f32_to_uf10(rgb[2]) & 0x3ff) << 22); +} + +static INLINE void r11g11b10f_to_float3(unsigned rgb, float retval[3]) +{ + retval[0] = uf11_to_f32( rgb & 0x7ff); + retval[1] = uf11_to_f32((rgb >> 11) & 0x7ff); + retval[2] = uf10_to_f32((rgb >> 22) & 0x3ff); +} -- cgit v1.2.3