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Use a brute force approach to test for Dual source blend support.

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Sorry for a direct commit to the main branch but i need fast feedback, and i don't want to leave problematic code in the main branch for a long time.
if this approach does not work for the drivers with problems will transform dual source blend to an option in the D3D9 backend.
I appreciate the help of the people that tested my last commit and thanks to neobrain for pointing this solution.
This commit is contained in:
Rodolfo Bogado
2013-03-31 20:02:13 -03:00
parent aabd8ce664
commit 45651098f6
3 changed files with 70 additions and 40 deletions
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57
Source/Plugins/Plugin_VideoDX9/Src/main.cpp
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@ -95,26 +95,16 @@ std::string VideoBackend::GetDisplayName()
void InitBackendInfo()
{
DX9::D3D::Init();
const int shaderModel = ((DX9::D3D::GetCaps().PixelShaderVersion >> 8) & 0xFF);
D3DCAPS9 device_caps = DX9::D3D::GetCaps();
const int shaderModel = ((device_caps.PixelShaderVersion >> 8) & 0xFF);
const int maxConstants = (shaderModel < 3) ? 32 : ((shaderModel < 4) ? 224 : 65536);
g_Config.backend_info.APIType = shaderModel < 3 ? API_D3D9_SM20 : API_D3D9_SM30;
g_Config.backend_info.bUseRGBATextures = false;
g_Config.backend_info.bUseMinimalMipCount = true;
g_Config.backend_info.bSupports3DVision = true;
OSVERSIONINFO info;
ZeroMemory(&info, sizeof(OSVERSIONINFO));
info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
if (GetVersionEx(&info))
{
// dual source blending is only supported in windows 7 o newer. sorry xp users
// we cannot test for device caps because most drivers just declare the minimun caps
// and don't expose their support for some functionalities
g_Config.backend_info.bSupportsDualSourceBlend = info.dwPlatformId == VER_PLATFORM_WIN32_NT && info.dwMajorVersion > 5;
}
else
{
g_Config.backend_info.bSupportsDualSourceBlend = false;
}
g_Config.backend_info.bSupportsSeparateAlphaFunction = device_caps.PrimitiveMiscCaps & D3DPMISCCAPS_SEPARATEALPHABLEND;
// Dual source blend will be tested later because in most devices the support is not declared in the device caps
g_Config.backend_info.bSupportsDualSourceBlend = false;
g_Config.backend_info.bSupportsFormatReinterpretation = true;
g_Config.backend_info.bSupportsPixelLighting = C_PLIGHTS + 40 <= maxConstants && C_PMATERIALS + 4 <= maxConstants;
@ -200,7 +190,44 @@ void VideoBackend::Video_Prepare()
CommandProcessor::Init();
PixelEngine::Init();
DLCache::Init();
// Test fo dual source blend support
// We can only support dual source blend if we first suport a separate alpha function
g_Config.backend_info.bSupportsDualSourceBlend = g_Config.backend_info.bSupportsSeparateAlphaFunction;
if(g_Config.backend_info.bSupportsDualSourceBlend)
{
// Test all the belnding modes that dual source blend requires
DWORD d3d_state = 0;
DWORD d3d_old_state = 0;
D3D::dev->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
D3D::dev->GetRenderState(D3DRS_SRCBLEND, &d3d_old_state);
// Test for source D3DBLEND_SRCCOLOR2 support
D3D::dev->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCCOLOR2);
D3D::dev->GetRenderState(D3DRS_SRCBLEND, &d3d_state);
g_Config.backend_info.bSupportsDualSourceBlend = (d3d_state == D3DBLEND_SRCCOLOR2);
// Test for source D3DBLEND_INVSRCCOLOR2 support
d3d_state = 0;
D3D::dev->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_INVSRCCOLOR2);
D3D::dev->GetRenderState(D3DRS_SRCBLEND, &d3d_state);
g_Config.backend_info.bSupportsDualSourceBlend = g_Config.backend_info.bSupportsDualSourceBlend && d3d_state == D3DBLEND_INVSRCCOLOR2;
// Restore original state
D3D::dev->SetRenderState(D3DRS_SRCBLEND, d3d_old_state);
d3d_old_state = 0;
D3D::dev->GetRenderState(D3DRS_DESTBLEND, &d3d_old_state);
// Test for destination D3DBLEND_SRCCOLOR2 support
D3D::dev->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_SRCCOLOR2);
D3D::dev->GetRenderState(D3DRS_DESTBLEND, &d3d_state);
g_Config.backend_info.bSupportsDualSourceBlend = g_Config.backend_info.bSupportsDualSourceBlend && d3d_state == D3DBLEND_SRCCOLOR2;
// test for destination D3DBLEND_INVSRCCOLOR2 support
d3d_state = 0;
D3D::dev->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCCOLOR2);
D3D::dev->GetRenderState(D3DRS_DESTBLEND, &d3d_state);
g_Config.backend_info.bSupportsDualSourceBlend = g_Config.backend_info.bSupportsDualSourceBlend && d3d_state == D3DBLEND_INVSRCCOLOR2;
// Restore original state
D3D::dev->SetRenderState(D3DRS_DESTBLEND, d3d_old_state);
D3D::dev->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
}
// Notify the core that the video backend is ready
Host_Message(WM_USER_CREATE);
}