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mesa: glsl: implement exp() functions in terms of EXP asm instruction, not pow

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This commit is contained in:
Brian Paul
2008-08-22 15:14:36 -06:00
parent 9e2b867b3f
commit 47d4b958cf
1 changed files with 15 additions and 14 deletions
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29
src/mesa/shader/slang/library/slang_common_builtin.gc
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@@ -473,32 +473,33 @@ vec4 pow(const vec4 a, const vec4 b)
float exp(const float a) float exp(const float a)
{ {
const float e = 2.71828; // NOTE: log2(e) = 1.44269502
__asm float_power __retVal, e, a; float t = a * 1.44269502;
__asm float_exp2 __retVal, t;
} }
vec2 exp(const vec2 a) vec2 exp(const vec2 a)
{ {
const float e = 2.71828; vec2 t = a * 1.44269502;
__asm float_power __retVal.x, e, a.x; __asm float_exp2 __retVal.x, t.x;
__asm float_power __retVal.y, e, a.y; __asm float_exp2 __retVal.y, t.y;
} }
vec3 exp(const vec3 a) vec3 exp(const vec3 a)
{ {
const float e = 2.71828; vec3 t = a * 1.44269502;
__asm float_power __retVal.x, e, a.x; __asm float_exp2 __retVal.x, t.x;
__asm float_power __retVal.y, e, a.y; __asm float_exp2 __retVal.y, t.y;
__asm float_power __retVal.z, e, a.z; __asm float_exp2 __retVal.z, t.z;
} }
vec4 exp(const vec4 a) vec4 exp(const vec4 a)
{ {
const float e = 2.71828; vec4 t = a * 1.44269502;
__asm float_power __retVal.x, e, a.x; __asm float_exp2 __retVal.x, t.x;
__asm float_power __retVal.y, e, a.y; __asm float_exp2 __retVal.y, t.y;
__asm float_power __retVal.z, e, a.z; __asm float_exp2 __retVal.z, t.z;
__asm float_power __retVal.w, e, a.w; __asm float_exp2 __retVal.w, t.w;
} }