From ebc0b2dca0eb6510189d433851bd475475e69aa6 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Fri, 6 May 2011 13:01:12 -0400 Subject: [PATCH] mesa: replace ONE_DIV_LN2 constant with M_LOG2E 1/ln(2) is equivalent to log2(e), so define it as such. log2(e) = ln(e)/ln(2) = 1/ln(2) Worst of all, the definitions for M_LOG2E and ONE_DIV_LN2 (right beside each other!) weren't the same. Reviewed-by: Alex Deucher Signed-off-by: Matt Turner Signed-off-by: Brian Paul --- src/mesa/main/compiler.h | 4 ---- src/mesa/program/prog_statevars.c | 2 +- 2 files changed, 1 insertion(+), 5 deletions(-) diff --git a/src/mesa/main/compiler.h b/src/mesa/main/compiler.h index e17fd0ff6fd..81e08a006f8 100644 --- a/src/mesa/main/compiler.h +++ b/src/mesa/main/compiler.h @@ -366,10 +366,6 @@ static INLINE GLuint CPU_TO_LE32(GLuint x) #define M_LOG2E (1.4426950408889634074) #endif -#ifndef ONE_DIV_LN2 -#define ONE_DIV_LN2 (1.442695040888963456) -#endif - #ifndef ONE_DIV_SQRT_LN2 #define ONE_DIV_SQRT_LN2 (1.201122408786449815) #endif diff --git a/src/mesa/program/prog_statevars.c b/src/mesa/program/prog_statevars.c index d94d7fe5dfb..16f9690e865 100644 --- a/src/mesa/program/prog_statevars.c +++ b/src/mesa/program/prog_statevars.c @@ -459,7 +459,7 @@ _mesa_fetch_state(struct gl_context *ctx, const gl_state_index state[], value[0] = (ctx->Fog.End == ctx->Fog.Start) ? 1.0f : (GLfloat)(-1.0F / (ctx->Fog.End - ctx->Fog.Start)); value[1] = ctx->Fog.End * -value[0]; - value[2] = (GLfloat)(ctx->Fog.Density * ONE_DIV_LN2); + value[2] = (GLfloat)(ctx->Fog.Density * M_LOG2E); /* M_LOG2E == 1/ln(2) */ value[3] = (GLfloat)(ctx->Fog.Density * ONE_DIV_SQRT_LN2); return; -- 2.30.2