d3dx9-36: Save multiplications to improve performance
David Adam
david.adam.cnrs at gmail.com
Wed Jun 24 21:07:23 CDT 2015
Hello,
with my dual-core, for sides=65000 the gain is about 40%.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.winehq.org/pipermail/wine-patches/attachments/20150624/141cda19/attachment.html>
-------------- next part --------------
From fee7560f5941ff081718e8cd36e2c24fa6735320 Mon Sep 17 00:00:00 2001
From: David Adam <david.adam.cnrs at gmail.com>
Date: Wed, 24 Jun 2015 16:01:11 -1000
Subject: d3dx9_36: Save multiplications to improve performance
---
dlls/d3dx9_36/mesh.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/dlls/d3dx9_36/mesh.c b/dlls/d3dx9_36/mesh.c
index 746b479..5be54d2 100644
--- a/dlls/d3dx9_36/mesh.c
+++ b/dlls/d3dx9_36/mesh.c
@@ -4563,7 +4563,7 @@ HRESULT WINAPI D3DXCreatePolygon(struct IDirect3DDevice9 *device, float length,
struct vertex *vertices;
WORD (*faces)[3];
DWORD (*adjacency_buf)[3];
- float scale;
+ float angle, scale;
unsigned int i;
TRACE("device %p, length %f, sides %u, mesh %p, adjacency %p.\n",
@@ -4591,7 +4591,9 @@ HRESULT WINAPI D3DXCreatePolygon(struct IDirect3DDevice9 *device, float length,
return hr;
}
- scale = 0.5f * length / sinf(D3DX_PI / sides);
+ angle = D3DX_PI / sides;
+ scale = 0.5f * length / sinf(angle);
+ angle *= 2.0f;
vertices[0].position.x = 0.0f;
vertices[0].position.y = 0.0f;
@@ -4602,8 +4604,8 @@ HRESULT WINAPI D3DXCreatePolygon(struct IDirect3DDevice9 *device, float length,
for (i = 0; i < sides; ++i)
{
- vertices[i + 1].position.x = cosf(2.0f * D3DX_PI * i / sides) * scale;
- vertices[i + 1].position.y = sinf(2.0f * D3DX_PI * i / sides) * scale;
+ vertices[i + 1].position.x = cosf(angle * i) * scale;
+ vertices[i + 1].position.y = sinf(angle * i) * scale;
vertices[i + 1].position.z = 0.0f;
vertices[i + 1].normal.x = 0.0f;
vertices[i + 1].normal.y = 0.0f;
--
2.1.4
More information about the wine-patches
mailing list