actions/itgmania212121
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Create RandomSeed.h (mt19937 RNG)

Browse Source 
This exists to replace the use of RageTimer as a RNG seed, which results in fewer GetTimeSinceStart() calls and better entropy.
This commit is contained in:
sukibaby
2024-07-18 02:55:37 -07:00
committed by teejusb
parent d4ab7b12ed
commit 36892b4e56
4 changed files with 47 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/BitmapText.cpp
+5 -10
View File
@@ -3,12 +3,12 @@
#include "XmlFile.h"
#include "FontManager.h"
#include "RageLog.h"
#include "RageTimer.h"
#include "RageDisplay.h"
#include "ThemeManager.h"
#include "Font.h"
#include "ActorUtil.h"
#include "LuaBinding.h"
#include "RandomSeed.h"
#include <cmath>
#include <cstddef>
@@ -330,16 +330,14 @@ void BitmapText::BuildChars()
if( m_bUsingDistortion )
{
int iSeed = std::lrint( RageTimer::GetTimeSinceStartFast()*500000.0f );
RandomGen rnd( iSeed );
for(unsigned int i= 0; i < m_aVertices.size(); i+=4)
{
float w= m_aVertices[i+2].p.x - m_aVertices[i].p.x;
float h= m_aVertices[i+2].p.y - m_aVertices[i].p.y;
for(unsigned int ioff= 0; ioff < 4; ++ioff)
{
m_aVertices[i+ioff].p.x += ((rnd()%9) / 8.0f - .5f) * m_fDistortion * w;
m_aVertices[i+ioff].p.y += ((rnd()%9) / 8.0f - .5f) * m_fDistortion * h;
m_aVertices[i+ioff].p.x += ((GetRandomInt() % 9) / 8.0f - .5f) * m_fDistortion * w;
m_aVertices[i+ioff].p.y += ((GetRandomInt() % 9) / 8.0f - .5f) * m_fDistortion * h;
}
}
}
@@ -711,7 +709,7 @@ void BitmapText::DrawPrimitives()
// render the diffuse pass
if( m_bRainbowScroll )
{
int color_index = int(RageTimer::GetTimeSinceStartFast() / 0.200) % RAINBOW_COLORS.size();
int color_index = (GetRandomInt() % RAINBOW_COLORS.size());
for( unsigned i=0; i<m_aVertices.size(); i+=4 )
{
const RageColor color = RAINBOW_COLORS[color_index];
@@ -770,12 +768,9 @@ void BitmapText::DrawPrimitives()
std::vector<RageVector3> vGlyphJitter;
if( m_bJitter )
{
int iSeed = std::lrint( RageTimer::GetTimeSinceStartFast()*8 );
RandomGen rnd( iSeed );
for( unsigned i=0; i<m_aVertices.size(); i+=4 )
{
RageVector3 jitter( rnd()%2, rnd()%3, 0 );
RageVector3 jitter( GetRandomInt() % 2, GetRandomInt() % 3, 0);
vGlyphJitter.push_back( jitter );
m_aVertices[i+0].p += jitter; // top left