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gsdx-tc: trace the alpha channel update in TC 

Improve the rendering in MGS3 (even if the game is still broken
due to others TC issues)

// Typical bug (MGS3 blue cloud):
// 1/ RT used as 32 bits => alpha channel written
// 2/ RT used as 24 bits => no update of alpha channel
// 3/ Lookup of texture that used alpha channel as index, HasSharedBits will return false
//    because of the previous draw call format
//
// Solution: consider the RT as 32 bits if the alpha was used in the past
This commit is contained in:
Gregory Hainaut 2015-06-25 19:09:26 +02:00
parent 4a65e5e723
commit 85543db094
2 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
plugins/GSdx/GSTextureCache.cpp
View File

@ -128,7 +128,16 @@ GSTextureCache::Source* GSTextureCache::LookupSource(const GIFRegTEX0& TEX0, con
Target* t = *i;
if(t->m_used && t->m_dirty.empty()) {
if (GSUtil::HasSharedBits(bp, psm, t->m_TEX0.TBP0, t->m_TEX0.PSM)) {
// Typical bug (MGS3 blue cloud):
// 1/ RT used as 32 bits => alpha channel written
// 2/ RT used as 24 bits => no update of alpha channel
// 3/ Lookup of texture that used alpha channel as index, HasSharedBits will return false
// because of the previous draw call format
//
// Solution: consider the RT as 32 bits if the alpha was used in the past
uint32 t_psm = (t->m_dirty_alpha) ? t->m_TEX0.PSM & ~0x1 : t->m_TEX0.PSM;
if (GSUtil::HasSharedBits(bp, psm, t->m_TEX0.TBP0, t_psm)) {
if (psm == PSM_PSMT8) {
// It is a complex to convert the code in shader. As a reference, let's do it on the CPU, it will
// be slow but
@ -243,6 +252,9 @@ GSTextureCache::Target* GSTextureCache::LookupTarget(const GIFRegTEX0& TEX0, int
GL_CACHE("TC: Lookup Target(%s) %dx%d, hit: %d (0x%x, F:0x%x)", to_string(type), w, h, dst->m_texture->GetID(), bp, TEX0.PSM);
dst->Update();
dst->m_dirty_alpha |= (TEX0.PSM != PSM_PSMCT24) && (TEX0.PSM != PSM_PSMZ24);
} else if (CanConvertDepth()) {
int rev_type = (type == DepthStencil) ? RenderTarget : DepthStencil;
@ -1303,6 +1315,7 @@ GSTextureCache::Target::Target(GSRenderer* r, const GIFRegTEX0& TEX0, uint8* tem
{
m_TEX0 = TEX0;
m_32_bits_fmt |= !(TEX0.PSM & 2);
m_dirty_alpha = (TEX0.PSM != PSM_PSMCT24) && (TEX0.PSM != PSM_PSMZ24);
m_valid = GSVector4i::zero();
}

1
plugins/GSdx/GSTextureCache.h
View File

@ -82,6 +82,7 @@ public:
GSDirtyRectList m_dirty;
GSVector4i m_valid;
bool m_depth_supported;
bool m_dirty_alpha;
public:
Target(GSRenderer* r, const GIFRegTEX0& TEX0, uint8* temp, bool depth_supported);