zdoom/gzdoom-gles
0
0
Fork 0
mirror of https://github.com/ZDoom/gzdoom-gles.git synced 2024-11-29 07:22:07 +00:00
Code Issues Projects Releases Packages Wiki Activity

Switch to the lower precision rsqrtss instruction as it is faster, especially on older Intel architectures and on AMD

Browse source
This commit is contained in:
Magnus Norddahl 2016-12-22 21:21:57 +01:00
parent fa66ca214e
commit 9a529192b0
4 changed files with 17 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
tools/drawergen/fixedfunction/drawspancodegen.cpp
View file

@ -256,7 +256,7 @@ SSAVec4i DrawSpanCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
// attenuation = 1 - MIN(dist * (1/radius), 1) // attenuation = 1 - MIN(dist * (1/radius), 1)
SSAFloat Lyz2 = light_y; // L.y*L.y + L.z*L.z SSAFloat Lyz2 = light_y; // L.y*L.y + L.z*L.z
SSAFloat Lx = light_x - viewpos_x; SSAFloat Lx = light_x - viewpos_x;
SSAFloat dist = SSAFloat::sqrt(Lyz2 + Lx * Lx); SSAFloat dist = SSAFloat::fastsqrt(Lyz2 + Lx * Lx);
SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true); SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true);
SSAVec4i contribution = (light_color * fg * attenuation) >> 16; SSAVec4i contribution = (light_color * fg * attenuation) >> 16;

2
tools/drawergen/fixedfunction/drawwallcodegen.cpp
View file

@ -244,7 +244,7 @@ SSAVec4i DrawWallCodegen::Shade(SSAVec4i fg, int index, bool isSimpleShade)
// attenuation = 1 - MIN(dist * (1/radius), 1) // attenuation = 1 - MIN(dist * (1/radius), 1)
SSAFloat Lxy2 = light_x; // L.x*L.x + L.y*L.y SSAFloat Lxy2 = light_x; // L.x*L.x + L.y*L.y
SSAFloat Lz = light_z - z; SSAFloat Lz = light_z - z;
SSAFloat dist = SSAFloat::sqrt(Lxy2 + Lz * Lz); SSAFloat dist = SSAFloat::fastsqrt(Lxy2 + Lz * Lz);
SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true); SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true);
SSAVec4i contribution = (light_color * fg * attenuation) >> 16; SSAVec4i contribution = (light_color * fg * attenuation) >> 16;

13
tools/drawergen/ssa/ssa_float.cpp
View file

@ -25,6 +25,7 @@
#include "ssa_int.h" #include "ssa_int.h"
#include "ssa_scope.h" #include "ssa_scope.h"
#include "ssa_bool.h" #include "ssa_bool.h"
#include "ssa_vec4f.h"
SSAFloat::SSAFloat() SSAFloat::SSAFloat()
: v(0) : v(0)
@ -60,6 +61,18 @@ SSAFloat SSAFloat::sqrt(SSAFloat f)
return SSAFloat::from_llvm(SSAScope::builder().CreateCall(SSAScope::intrinsic(llvm::Intrinsic::sqrt, params), f.v, SSAScope::hint())); return SSAFloat::from_llvm(SSAScope::builder().CreateCall(SSAScope::intrinsic(llvm::Intrinsic::sqrt, params), f.v, SSAScope::hint()));
} }
SSAFloat SSAFloat::fastsqrt(SSAFloat f)
{
return f * rsqrt(f);
}
SSAFloat SSAFloat::rsqrt(SSAFloat f)
{
llvm::Value *f_ss = SSAScope::builder().CreateInsertElement(llvm::UndefValue::get(SSAVec4f::llvm_type()), f.v, llvm::ConstantInt::get(SSAScope::context(), llvm::APInt(32, (uint64_t)0)));
f_ss = SSAScope::builder().CreateCall(SSAScope::intrinsic(llvm::Intrinsic::x86_sse_rsqrt_ss), f_ss, SSAScope::hint());
return SSAFloat::from_llvm(SSAScope::builder().CreateExtractElement(f_ss, SSAInt(0).v, SSAScope::hint()));
}
SSAFloat SSAFloat::sin(SSAFloat val) SSAFloat SSAFloat::sin(SSAFloat val)
{ {
std::vector<llvm::Type *> params; std::vector<llvm::Type *> params;

2
tools/drawergen/ssa/ssa_float.h
View file

@ -37,6 +37,8 @@ public:
static SSAFloat from_llvm(llvm::Value *v) { return SSAFloat(v); } static SSAFloat from_llvm(llvm::Value *v) { return SSAFloat(v); }
static llvm::Type *llvm_type(); static llvm::Type *llvm_type();
static SSAFloat sqrt(SSAFloat f); static SSAFloat sqrt(SSAFloat f);
static SSAFloat fastsqrt(SSAFloat f);
static SSAFloat rsqrt(SSAFloat f);
static SSAFloat sin(SSAFloat val); static SSAFloat sin(SSAFloat val);
static SSAFloat cos(SSAFloat val); static SSAFloat cos(SSAFloat val);
static SSAFloat pow(SSAFloat val, SSAFloat power); static SSAFloat pow(SSAFloat val, SSAFloat power);