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d3d11: set and restore blend state between passes and disable unneede…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| use crate::error; | ||
| use crate::error::assume_d3d11_init; | ||
| use windows::Win32::Foundation::BOOL; | ||
| use windows::Win32::Graphics::Direct3D11::{ | ||
| ID3D11BlendState, ID3D11Device, ID3D11DeviceContext, ID3D11RasterizerState, D3D11_BLEND_DESC, | ||
| D3D11_BLEND_INV_SRC_ALPHA, D3D11_BLEND_ONE, D3D11_BLEND_OP_ADD, D3D11_BLEND_SRC_ALPHA, | ||
| D3D11_COLOR_WRITE_ENABLE_ALL, D3D11_CULL_NONE, D3D11_DEFAULT_SAMPLE_MASK, D3D11_FILL_SOLID, | ||
| D3D11_RASTERIZER_DESC, D3D11_RENDER_TARGET_BLEND_DESC, | ||
| }; | ||
|
|
||
| pub struct D3D11State { | ||
| blend: ID3D11BlendState, | ||
| rs: ID3D11RasterizerState, | ||
| } | ||
|
|
||
| pub struct D3D11StateSaveGuard<'a> { | ||
| ctx: &'a ID3D11DeviceContext, | ||
| saved_blend: Option<ID3D11BlendState>, | ||
| saved_blend_factor: [f32; 4], | ||
| saved_blend_mask: u32, | ||
| saved_rs: Option<ID3D11RasterizerState>, | ||
| state: &'a D3D11State, | ||
| } | ||
|
|
||
| impl D3D11State { | ||
| pub fn new(device: &ID3D11Device) -> error::Result<D3D11State> { | ||
| let blend = unsafe { | ||
| let mut blend_desc = D3D11_BLEND_DESC { | ||
| AlphaToCoverageEnable: BOOL::from(false), | ||
| IndependentBlendEnable: BOOL::from(false), | ||
| ..Default::default() | ||
| }; | ||
|
|
||
| let rtv_blend_desc = D3D11_RENDER_TARGET_BLEND_DESC { | ||
| BlendEnable: BOOL::from(false), | ||
| SrcBlend: D3D11_BLEND_ONE, | ||
| DestBlend: D3D11_BLEND_ONE, | ||
| BlendOp: D3D11_BLEND_OP_ADD, | ||
| SrcBlendAlpha: D3D11_BLEND_SRC_ALPHA, | ||
| DestBlendAlpha: D3D11_BLEND_INV_SRC_ALPHA, | ||
| BlendOpAlpha: D3D11_BLEND_OP_ADD, | ||
| RenderTargetWriteMask: D3D11_COLOR_WRITE_ENABLE_ALL.0 as u8, | ||
| }; | ||
|
|
||
| blend_desc.RenderTarget[0] = rtv_blend_desc; | ||
|
|
||
| let mut blend = None; | ||
| device.CreateBlendState(&blend_desc, Some(&mut blend))?; | ||
| assume_d3d11_init!(blend, "CreateBlendState"); | ||
| blend | ||
| }; | ||
|
|
||
| let rs = unsafe { | ||
| let rs_desc = D3D11_RASTERIZER_DESC { | ||
| FillMode: D3D11_FILL_SOLID, | ||
| CullMode: D3D11_CULL_NONE, | ||
| FrontCounterClockwise: BOOL::from(false), | ||
| DepthBias: 0, | ||
| DepthBiasClamp: 0.0, | ||
| SlopeScaledDepthBias: 0.0, | ||
| DepthClipEnable: BOOL::from(false), | ||
| ScissorEnable: BOOL::from(false), | ||
| MultisampleEnable: BOOL::from(false), | ||
| AntialiasedLineEnable: BOOL::from(false), | ||
| }; | ||
| let mut rs = None; | ||
| device.CreateRasterizerState(&rs_desc, Some(&mut rs))?; | ||
| assume_d3d11_init!(rs, "CreateRasterizerState"); | ||
| rs | ||
| }; | ||
|
|
||
| Ok(D3D11State { blend, rs }) | ||
| } | ||
|
|
||
| /// Enters the state necessary for rendering filter passes. | ||
| pub fn enter_filter_state<'a>( | ||
| &'a self, | ||
| context: &'a ID3D11DeviceContext, | ||
| ) -> D3D11StateSaveGuard<'a> { | ||
| // save previous state | ||
| let guard = unsafe { | ||
| let mut saved_blend = None; | ||
| let mut saved_blend_factor = [0f32; 4]; | ||
| let mut saved_blend_mask = 0; | ||
| context.OMGetBlendState( | ||
| Some(&mut saved_blend), | ||
| Some(saved_blend_factor.as_mut_ptr()), | ||
| Some(&mut saved_blend_mask), | ||
| ); | ||
| let saved_rs = context.RSGetState().ok(); | ||
|
|
||
| D3D11StateSaveGuard { | ||
| ctx: &context, | ||
| saved_blend, | ||
| saved_blend_factor, | ||
| saved_blend_mask, | ||
| saved_rs, | ||
| state: &self, | ||
| } | ||
| }; | ||
|
|
||
| unsafe { | ||
| context.RSSetState(&self.rs); | ||
| context.OMSetBlendState(&self.blend, None, D3D11_DEFAULT_SAMPLE_MASK); | ||
| } | ||
| guard | ||
| } | ||
| } | ||
|
|
||
| impl Drop for D3D11StateSaveGuard<'_> { | ||
| fn drop(&mut self) { | ||
| unsafe { | ||
| self.ctx.RSSetState(self.saved_rs.as_ref()); | ||
| self.ctx.OMSetBlendState( | ||
| self.saved_blend.as_ref(), | ||
| Some(self.saved_blend_factor.as_ptr()), | ||
| self.saved_blend_mask, | ||
| ); | ||
| } | ||
| } | ||
| } |
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