diff options
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c b/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c index 217aaa99838..f949a8daff1 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c @@ -170,6 +170,8 @@ lp_build_linear_to_srgb(struct gallivm_state *gallivm, */ float exp_f = 2.0f / 3.0f; + /* some compilers can't do exp2f, so this is exp2f(127.0f/exp_f - 127.0f) */ + float exp2f_c = 1.30438178253e+19f; float coeff_f = 0.62996f; LLVMValueRef pow_approx, coeff, x2, exponent, pow_1, pow_2; struct lp_type int_type = lp_int_type(src_type); @@ -179,8 +181,7 @@ lp_build_linear_to_srgb(struct gallivm_state *gallivm, */ exponent = lp_build_const_vec(gallivm, src_type, exp_f); coeff = lp_build_const_vec(gallivm, src_type, - exp2f(127.0f / exp_f - 127.0f) * - powf(coeff_f, 1.0f / exp_f)); + exp2f_c * powf(coeff_f, 1.0f / exp_f)); /* premultiply src */ tmp = lp_build_mul(&f32_bld, coeff, src); |