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Ensure correct swizzle is used for instructions that only allow for a single swizzle component 

- Updated commented out DXBX method to work with current code structure
- Default swizzle to .x component per direct3d documentation (needs further verification)
- Updated logic to only apply RSQ swizzle when not already referencing a single component
This commit is contained in:
revel8n 2018-08-09 05:04:43 -05:00
parent 5c801b2a05
commit aebfde5df5
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GPG Key ID: 7FC46D430508269D
1 changed files with 85 additions and 85 deletions
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124
src/CxbxKrnl/EmuD3D8/VertexShader.cpp
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@ -1128,62 +1128,10 @@ static boolean VshAddInstructionMAC_ARL(VSH_SHADER_INSTRUCTION *pInstruction,
return TRUE;
}
/*
// Dxbx addition : Scalar instructions reading from W should read from X instead
boolean DxbxFixupScalarParameter(VSH_SHADER_INSTRUCTION *pInstruction,
static boolean DxbxFixupScalarParameter(VSH_SHADER_INSTRUCTION *pInstruction,
VSH_XBOX_SHADER *pShader,
VSH_PARAMETER *pParameter)
{
boolean Result;
int i;
boolean WIsWritten;
// The DirectX vertex shader language specifies that the exp, log, rcc, rcp, and rsq instructions
// all operate on the "w" component of the input. But the microcode versions of these instructions
// actually operate on the "x" component of the input.
Result = false;
// Test if this is a scalar instruction :
if (pInstruction->ILU in [ILU_RCP, ILU_RCC, ILU_RSQ, ILU_EXP, ILU_LOG])
{
// Test if this parameter reads all components, including W (TODO : Or should we fixup any W reading swizzle?) :
if ((pParameter->Swizzle[0] = SWIZZLE_X)
&& (pParameter->Swizzle[1] = SWIZZLE_Y)
&& (pParameter->Swizzle[2] = SWIZZLE_Z)
&& (pParameter->Swizzle[3] = SWIZZLE_W))
{
// Also test that the .W component is never written to before:
WIsWritten = false;
for (i = 0; i < pShader->IntermediateCount; i++)
{
// Stop when we reached this instruction :
if (&(pShader->Intermediate[i]) == pInstruction)
break;
// Check if this instruction writes to the .W component of the same input parameter :
if (((pShader->Intermediate[i].Output.Type == IMD_OUTPUT_C) && (pParameter->ParameterType == PARAM_C))
|| ((pShader->Intermediate[i].Output.Type == IMD_OUTPUT_R) && (pParameter->ParameterType == PARAM_R)))
{
WIsWritten = (pShader->Intermediate[i].Output.Address == pParameter->Address)
&& ((pShader->Intermediate[i].Output.Mask && MASK_W) > 0);
if (WIsWritten)
break;
}
}
if (!WIsWritten)
{
// Change the read from W into a read from X (this fixes the XDK VolumeLight sample) :
VshSetSwizzle(pParameter, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X);
DbgVshPrintf("Dxbx fixup on scalar instruction applied; Changed read of uninitialized W into a read of X!\n");
Result = true;
}
}
}
return Result;
}
*/
VSH_PARAMETER *pParameter);
static boolean VshAddInstructionILU_R(VSH_SHADER_INSTRUCTION *pInstruction,
VSH_XBOX_SHADER *pShader,
@ -1195,10 +1143,9 @@ static boolean VshAddInstructionILU_R(VSH_SHADER_INSTRUCTION *pInstruction,
return FALSE;
}
/* TODO
// Dxbx note : Scalar instructions read from C, but use X instead of W, fix that :
DxbxFixupScalarParameter(pInstruction, pShader, &pInstruction.C);
*/
DxbxFixupScalarParameter(pInstruction, pShader, &pInstruction->C);
pIntermediate = VshNewIntermediate(pShader);
pIntermediate->IsCombined = IsCombined;
@ -1302,16 +1249,25 @@ static void VshConvertToIntermediate(VSH_SHADER_INSTRUCTION *pInstruction,
(void)VshAddInstructionILU_O(pInstruction, pShader, IsCombined);
}
static inline void VshSetSwizzle(VSH_PARAMETER *pParameter,
VSH_SWIZZLE x,
VSH_SWIZZLE y,
VSH_SWIZZLE z,
VSH_SWIZZLE w)
{
pParameter->Swizzle[0] = x;
pParameter->Swizzle[1] = y;
pParameter->Swizzle[2] = z;
pParameter->Swizzle[3] = w;
}
static inline void VshSetSwizzle(VSH_IMD_PARAMETER *pParameter,
VSH_SWIZZLE x,
VSH_SWIZZLE y,
VSH_SWIZZLE z,
VSH_SWIZZLE w)
{
pParameter->Parameter.Swizzle[0] = x;
pParameter->Parameter.Swizzle[1] = y;
pParameter->Parameter.Swizzle[2] = z;
pParameter->Parameter.Swizzle[3] = w;
VshSetSwizzle(&pParameter->Parameter, x, y, z, w);
}
static inline void VshSetOutputMask(VSH_IMD_OUTPUT* pOutput,
@ -1325,6 +1281,45 @@ static inline void VshSetOutputMask(VSH_IMD_OUTPUT* pOutput,
pOutput->Mask[2] = MaskZ;
pOutput->Mask[3] = MaskW;
}
// Dxbx addition : Scalar instructions reading from W should read from X instead
static boolean DxbxFixupScalarParameter(VSH_SHADER_INSTRUCTION *pInstruction,
VSH_XBOX_SHADER *pShader,
VSH_PARAMETER *pParameter)
{
boolean Result;
int i;
boolean WIsWritten;
boolean XIsWritten;
// The DirectX vertex shader language specifies that the exp, log, rcc, rcp, and rsq instructions
// all operate on the "w" component of the input. But the microcode versions of these instructions
// actually operate on the "x" component of the input.
Result = false;
// Test if this is a scalar instruction :
if (pInstruction->ILU == ILU_RCP ||
pInstruction->ILU == ILU_RCC ||
pInstruction->ILU == ILU_RSQ ||
pInstruction->ILU == ILU_EXP ||
pInstruction->ILU == ILU_LOG)
{
// Test if this parameter reads all components, including W (TODO : Or should we fixup any W reading swizzle?) :
if ((pParameter->Swizzle[0] == SWIZZLE_X)
&& (pParameter->Swizzle[1] == SWIZZLE_Y)
&& (pParameter->Swizzle[2] == SWIZZLE_Z)
&& (pParameter->Swizzle[3] == SWIZZLE_W))
{
// Change the read from W into a read from X (this fixes the XDK VolumeLight sample) :
VshSetSwizzle(pParameter, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X);
DbgVshPrintf("Dxbx fixup on scalar instruction applied; Changed read of uninitialized W into a read of X!\n");
Result = true;
}
}
return Result;
}
/*
mul oPos.xyz, r12, c-38
+rcc r1.x, r12.w
@ -1510,6 +1505,11 @@ static boolean VshConvertShader(VSH_XBOX_SHADER *pShader,
pIntermediate->ILU = ILU_RCP;
}
auto sw = pIntermediate->Parameters[0].Parameter.Swizzle;
bool singleSwizzle = sw[0] == sw[1] && sw[1] == sw[2] && sw[2] == sw[3];
if (!singleSwizzle)
{
// Fix when RSQ reads from unitialized components
if (pIntermediate->InstructionType == IMD_ILU && pIntermediate->ILU == ILU_RSQ) {
int swizzle = (pIntermediate->Output.Mask[0]) | (pIntermediate->Output.Mask[1] << 1) | (pIntermediate->Output.Mask[2] << 2) | (pIntermediate->Output.Mask[3] << 3);
@ -1533,7 +1533,7 @@ static boolean VshConvertShader(VSH_XBOX_SHADER *pShader,
break;
}
}
}
if (pIntermediate->InstructionType == IMD_ILU && pIntermediate->ILU == ILU_EXP)
{
// EXP on DX8 requires that exactly one swizzle is specified on the output