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255       value[0] = ctx->Fog.Density;
457           * exp: 2^-(density/ln(2) * fogcoord)
458           * exp2: 2^-((density/(ln(2)^2) * fogcoord)^2)
463          value[2] = (GLfloat)(ctx->Fog.Density * M_LOG2E); /* M_LOG2E == 1/ln(2) */
464          value[3] = (GLfloat)(ctx->Fog.Density * ONE_DIV_SQRT_LN2);