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Properly emulate the alpha read pixel engine register function (used for EFB peeks).

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6313 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
NeoBrainX
2010-10-24 19:52:52 +00:00
parent b71cd5f383
commit ab53c84dcf
5 changed files with 87 additions and 38 deletions
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27
Source/Plugins/Plugin_VideoDX9/Src/Render.cpp
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@ -30,6 +30,7 @@
#include "VideoConfig.h"
#include "main.h"
#include "VertexManager.h"
#include "PixelEngine.h"
#include "Render.h"
#include "OpcodeDecoding.h"
#include "BPStructs.h"
@ -691,6 +692,20 @@ void Renderer::SetColorMask()
D3D::SetRenderState(D3DRS_COLORWRITEENABLE, color_mask);
}
// This function allows the CPU to directly access the EFB.
// There are EFB peeks (which will read the color or depth of a pixel)
// and EFB pokes (which will change the color or depth of a pixel).
//
// The behavior of EFB peeks can only be modified by:
// - GX_PokeAlphaRead
// The behavior of EFB pokes can be modified by:
// - GX_PokeAlphaMode (TODO)
// - GX_PokeAlphaUpdate (TODO)
// - GX_PokeBlendMode (TODO)
// - GX_PokeColorUpdate (TODO)
// - GX_PokeDither (TODO)
// - GX_PokeDstAlpha (TODO)
// - GX_PokeZMode (TODO)
u32 Renderer::AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data)
{
if (!g_ActiveConfig.bEFBAccessEnable)
@ -738,7 +753,6 @@ u32 Renderer::AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data)
TargetRectangle targetPixelRc = ConvertEFBRectangle(efbPixelRc);
u32 z = 0;
HRESULT hr;
RECT RectToLock;
RectToLock.bottom = targetPixelRc.bottom;
@ -813,6 +827,7 @@ u32 Renderer::AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data)
pSystemBuf->LockRect(&drect, &RectToLock, D3DLOCK_READONLY);
float val = 0.0f;
u32 z = 0;
switch (g_framebufferManager.GetEFBDepthReadSurfaceFormat())
{
@ -849,9 +864,15 @@ u32 Renderer::AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data)
D3DLOCKED_RECT drect;
pSystemBuf->LockRect(&drect, &RectToLock, D3DLOCK_READONLY);
z = ((u32*)drect.pBits)[0];
u32 ret = ((u32*)drect.pBits)[0];
pSystemBuf->UnlockRect();
return z;
// check what to do with the alpha channel (GX_PokeAlphaRead)
PixelEngine::UPEAlphaReadReg alpha_read_mode;
PixelEngine::Read16((u16&)alpha_read_mode, PE_DSTALPHACONF);
if(alpha_read_mode.ReadMode == 2) return ret; // GX_READ_NONE
else if(alpha_read_mode.ReadMode == 1) return (ret | 0xFF000000); // GX_READ_FF
else /*if(alpha_read_mode.ReadMode == 0)*/ return (ret & 0x00FFFFFF); // GX_READ_00
}
else //if(type == POKE_COLOR)
{