diff options
Diffstat (limited to 'xc/lib/GL/mesa/src/drv/sis/sis_fog.c')
| -rw-r--r-- | xc/lib/GL/mesa/src/drv/sis/sis_fog.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/xc/lib/GL/mesa/src/drv/sis/sis_fog.c b/xc/lib/GL/mesa/src/drv/sis/sis_fog.c deleted file mode 100644 index 74b888b1a..000000000 --- a/xc/lib/GL/mesa/src/drv/sis/sis_fog.c +++ /dev/null @@ -1,190 +0,0 @@ -/************************************************************************** - -Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan. -Copyright 2003 Eric Anholt -All Rights Reserved. - -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 -on the rights to use, copy, modify, merge, publish, distribute, sub -license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL -ERIC ANHOLT OR SILICON INTEGRATED SYSTEMS CORP 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. - -**************************************************************************/ -/* $XFree86: xc/lib/GL/mesa/src/drv/sis/sis_fog.c,v 1.3 2000/09/26 15:56:48 tsi Exp $ */ - -/* - * Authors: - * Sung-Ching Lin <sclin@sis.com.tw> - * Eric Anholt <anholt@FreeBSD.org> - */ - -#include "sis_context.h" -#include "sis_state.h" -#include "swrast/swrast.h" - -#include "mmath.h" - -static GLint convertFtToFogFt( GLfloat dwInValue ); - -void -sisDDFogfv( GLcontext *ctx, GLenum pname, const GLfloat *params ) -{ - sisContextPtr smesa = SIS_CONTEXT(ctx); - __GLSiSHardware *prev = &smesa->prev; - __GLSiSHardware *current = &smesa->current; - - float fArg; - GLint fogColor; - - switch (pname) - { - case GL_FOG_MODE: - current->hwFog &= ~MASK_FogMode; - switch (ctx->Fog.Mode) - { - case GL_LINEAR: - current->hwFog |= FOGMODE_LINEAR; - break; - case GL_EXP: - current->hwFog |= FOGMODE_EXP; - break; - case GL_EXP2: - current->hwFog |= FOGMODE_EXP2; - break; - } - if (current->hwFog != prev->hwFog) { - prev->hwFog = current->hwFog; - smesa->GlobalFlag |= GFLAG_FOGSETTING; - } - break; - case GL_FOG_DENSITY: - current->hwFogDensity = convertFtToFogFt( ctx->Fog.Density ); - if (current->hwFogDensity != prev->hwFogDensity) { - prev->hwFogDensity = current->hwFogDensity; - smesa->GlobalFlag |= GFLAG_FOGSETTING; - } - break; - case GL_FOG_START: - case GL_FOG_END: - fArg = 1.0 / (ctx->Fog.End - ctx->Fog.Start); - current->hwFogInverse = doFPtoFixedNoRound( fArg, 10 ); - if (pname == GL_FOG_END) - { - if (smesa->Chipset == PCI_CHIP_SIS300) - current->hwFogFar = doFPtoFixedNoRound( ctx->Fog.End, 10 ); - else - current->hwFogFar = doFPtoFixedNoRound( ctx->Fog.End, 6 ); - } - if (current->hwFogFar != prev->hwFogFar || - current->hwFogInverse != prev->hwFogInverse) - { - prev->hwFogFar = current->hwFogFar; - prev->hwFogInverse = current->hwFogInverse; - smesa->GlobalFlag |= GFLAG_FOGSETTING; - } - break; - case GL_FOG_INDEX: - /* TODO */ - break; - case GL_FOG_COLOR: - fogColor = FLOAT_TO_UBYTE( ctx->Fog.Color[0] ) << 16; - fogColor |= FLOAT_TO_UBYTE( ctx->Fog.Color[1] ) << 8; - fogColor |= FLOAT_TO_UBYTE( ctx->Fog.Color[2] ); - current->hwFog &= 0xff000000; - current->hwFog |= fogColor; - if (current->hwFog != prev->hwFog) { - prev->hwFog = current->hwFog; - smesa->GlobalFlag |= GFLAG_FOGSETTING; - } - break; - } -} - -GLint -doFPtoFixedNoRound( GLfloat dwInValue, int nFraction ) -{ - GLint dwMantissa; - int nTemp; - union { int i; float f; } u; - GLint val; - - u.f = dwInValue; - val = u.i; - - if (val == 0) - return 0; - nTemp = (int) (val & 0x7F800000) >> 23; - nTemp = nTemp - 127 + nFraction - 23; - dwMantissa = (val & 0x007FFFFF) | 0x00800000; - - if (nTemp < -25) - return 0; - if (nTemp > 0) - dwMantissa <<= nTemp; - else { - nTemp = -nTemp; - dwMantissa >>= nTemp; - } - if (val & 0x80000000) - dwMantissa = ~dwMantissa + 1; - return dwMantissa; -} - -/* s[8].23->s[7].10 */ -static GLint -convertFtToFogFt( GLfloat dwInValue ) -{ - GLint dwMantissa, dwExp; - GLint dwRet; - union { int i; float f; } u; - GLint val; - - u.f = dwInValue; - val = u.i; - - if (val == 0) - return 0; - - /* ----- Standard float Format: s[8].23 ----- - * ----- = (-1)^S * 2^(E - 127) * (1 + M / 2^23) ----- - * ----- = (-1)^S * 2^((E-63) - 64) * (1 + (M/2^13) / 2^10) ----- - * ----- Density float Format: s[7].10 ----- - * ----- New Exponential = E - 63 ----- - * ----- New Mantissa = M / 2^13 ----- - * ----- ----- - */ - - dwExp = (val & 0x7F800000) >> 23; - dwExp -= 63; - - if (dwExp < 0) - return 0; - - if (dwExp <= 0x7F) - dwMantissa = (val & 0x007FFFFF) >> (23 - 10); - else { - /* ----- To Return +Max(or -Max) ----- */ - dwExp = 0x7F; - dwMantissa = 0x3FF; - } - - dwRet = (val & 0x80000000) >> (31 - 17); /* Shift Sign Bit */ - - dwRet |= (dwExp << 10) | dwMantissa; - - return dwRet; -} |