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gsdx: NaN is likely not well supported for S & T 

Add also a comment to explain the NaN issue on Q
This commit is contained in:
Gregory Hainaut 2015-07-20 19:34:42 +02:00
parent 539a1767a3
commit 7ca463bf75
1 changed files with 6 additions and 0 deletions
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6
plugins/GSdx/GSState.cpp
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@ -504,6 +504,8 @@ void GSState::GIFPackedRegHandlerSTQ(const GIFPackedReg* RESTRICT r)
*(int*)&m_q = GSVector4i::store(q);
ASSERT(!std::isnan(m_q)); // See GIFRegHandlerRGBAQ
ASSERT(!std::isnan(m_v.ST.S)); // See GIFRegHandlerRGBAQ
ASSERT(!std::isnan(m_v.ST.T)); // See GIFRegHandlerRGBAQ
#ifdef Offset_ST
GIFRegTEX0 TEX0 = m_context->TEX0;
@ -709,6 +711,8 @@ void GSState::GIFRegHandlerRGBAQ(const GIFReg* RESTRICT r)
rgbaq = rgbaq.upl32(rgbaq.blend8(GSVector4i::cast(GSVector4::m_one), rgbaq == GSVector4i::zero()).yyyy()); // see GIFPackedRegHandlerSTQ
m_v.RGBAQ = rgbaq;
// Silent Hill output a nan in Q to emulate the flash light. Unfortunately it
// breaks GSVertexTrace code that rely on min/max.
if (std::isnan(m_v.RGBAQ.Q)) {
m_v.RGBAQ.Q = std::numeric_limits<float>::max();
}
@ -717,6 +721,8 @@ void GSState::GIFRegHandlerRGBAQ(const GIFReg* RESTRICT r)
void GSState::GIFRegHandlerST(const GIFReg* RESTRICT r)
{
m_v.ST = (GSVector4i)r->ST;
ASSERT(!std::isnan(m_v.ST.S)); // See GIFRegHandlerRGBAQ
ASSERT(!std::isnan(m_v.ST.T)); // See GIFRegHandlerRGBAQ
#ifdef Offset_ST
GIFRegTEX0 TEX0 = m_context->TEX0;