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Described arguments and steps of a few VertexShader functions

This commit is contained in:
patrickvl 2018-03-14 16:23:25 +01:00 committed by PatrickvL
parent c2a96bbe48
commit e8469077ff
1 changed files with 18 additions and 1 deletions
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19
src/CxbxKrnl/EmuD3D8.cpp
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@ -2614,6 +2614,9 @@ VOID WINAPI XTL::EMUPATCH(D3DDevice_LoadVertexShader)
LOG_FUNC_ARG(Address)
LOG_FUNC_END;
// Handle is always address of an Xbox VertexShader struct, or-ed with 1 (X_D3DFVF_RESERVED0)
// An Xbox VertexShader contains : a 'Vshd' signature, flags, a size, a program (and constants)
// Address is the slot (offset) from which the program must be written onwards (as whole DWORDS)
if(Address < 136 && VshHandleIsVertexShader(Handle))
{
VERTEX_SHADER *pVertexShader = (VERTEX_SHADER *)(VshHandleGetVertexShader(Handle))->Handle;
@ -2642,7 +2645,13 @@ VOID WINAPI XTL::EMUPATCH(D3DDevice_SelectVertexShader)
LOG_FUNC_END;
HRESULT hRet;
// Address always indicates a previously loaded vertex shader slot (from where the program is used).
// Handle can be null if the current Xbox VertexShader is assigned
// Handle can be an address of an Xbox VertexShader struct, or-ed with 1 (X_D3DFVF_RESERVED0)
// If Handle is assigned, it becomes the new current Xbox VertexShader,
// which resets a bit of state (nv2a execution mode, viewport, ?)
// Either way, the given address slot is selected as the start of the current vertex shader program
g_CurrentXboxVertexShaderHandle = Handle;
if(VshHandleIsVertexShader(Handle))
@ -3146,6 +3155,14 @@ HRESULT WINAPI XTL::EMUPATCH(D3DDevice_CreateVertexShader)
LOG_FUNC_ARG_TYPE(X_D3DUSAGE, Usage)
LOG_FUNC_END;
// Allocates an Xbox VertexShader struct
// pHandle will receive the addres of the new shader
// Sets reference count to 1
// Puts Usage in VertexShader->Flags
// If pFunction is not null, it points to DWORDS shader type, length and a binary compiled xbox vertex shader
// If pDeclaration is not null, it's parsed, resulting in a number of constants
// TODO : Complete this
// create emulated shader struct
X_D3DVertexShader *pD3DVertexShader = (X_D3DVertexShader*)g_VMManager.AllocateZeroed(sizeof(X_D3DVertexShader));
VERTEX_SHADER *pVertexShader = (VERTEX_SHADER*)g_VMManager.AllocateZeroed(sizeof(VERTEX_SHADER));