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gsdx ate: separate the code that depends on TEST.AFAIL 

Easier to read and allow a switch optimization

Add a shortcut for the common ATST_ALWAYS case
This commit is contained in:
Gregory Hainaut 2016-09-25 15:35:15 +02:00
parent f77c1900fa
commit c5f086b385
1 changed files with 32 additions and 22 deletions
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54
plugins/GSdx/GSState.cpp
View File

@ -2966,39 +2966,49 @@ void GSState::GetAlphaMinMax()
bool GSState::TryAlphaTest(uint32& fm, uint32& zm)
{
const GSDrawingContext* context = m_context;
// Shortcut for the easy case
if(m_context->TEST.ATST == ATST_ALWAYS)
return true;
// Alpha test can only control the write of some channels. If channels are already masked
// the alpha test is therefore a nop.
switch (m_context->TEST.AFAIL) {
case AFAIL_KEEP:
break;
case AFAIL_FB_ONLY:
if (zm == 0xFFFFFFFF)
return true;
break;
case AFAIL_ZB_ONLY:
if (fm == 0xFFFFFFFF)
return true;
break;
case AFAIL_RGB_ONLY:
if (zm == 0xFFFFFFFF && ((fm & 0xFF000000) == 0xFF000000 || GSLocalMemory::m_psm[m_context->FRAME.PSM].fmt == 1))
return true;
}
bool pass = true;
if(context->TEST.ATST == ATST_NEVER)
if(m_context->TEST.ATST == ATST_NEVER)
{
pass = false;
pass = false; // Shortcut to avoid GetAlphaMinMax below
}
else if((context->TEST.AFAIL == AFAIL_FB_ONLY) && zm == 0xFFFFFFFF)
{
// Alpha test controls depth writes but they're masked
pass = true;
}
else if((context->TEST.AFAIL == AFAIL_ZB_ONLY) && fm == 0xFFFFFFFF)
{
// Alpha test controls color writes but they're masked
pass = true;
}
else if((context->TEST.AFAIL == AFAIL_RGB_ONLY) && zm == 0xFFFFFFFF && ((fm & 0xFF000000) == 0xFF000000 || GSLocalMemory::m_psm[context->FRAME.PSM].fmt == 1))
{
// Alpha test controls alpha/depth writes but they're both masked
pass = true;
}
else if(context->TEST.ATST != ATST_ALWAYS)
else
{
GetAlphaMinMax();
int amin = m_vt.m_alpha.min;
int amax = m_vt.m_alpha.max;
int aref = context->TEST.AREF;
int aref = m_context->TEST.AREF;
switch(context->TEST.ATST)
switch(m_context->TEST.ATST)
{
case ATST_NEVER:
pass = false;
@ -3043,7 +3053,7 @@ bool GSState::TryAlphaTest(uint32& fm, uint32& zm)
if(!pass)
{
switch(context->TEST.AFAIL)
switch(m_context->TEST.AFAIL)
{
case AFAIL_KEEP: fm = zm = 0xffffffff; break;
case AFAIL_FB_ONLY: zm = 0xffffffff; break;