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// Renderer pipeline and device-objects creation
use super::*;
impl WgpuRenderer {
/// Create device objects (pipeline, etc.)
///
/// This corresponds to ImGui_ImplWGPU_CreateDeviceObjects in the C++ implementation
pub(super) fn create_device_objects(
&mut self,
backend_data: &mut WgpuBackendData,
) -> RendererResult<()> {
let device = &backend_data.device;
// Reuse bind group layouts from shared render resources so that the
// pipeline layout and the actually bound groups share the same layouts.
let uniform_layout = backend_data
.render_resources
.uniform_buffer()
.map(|ub| ub.bind_group_layout())
.ok_or_else(|| {
RendererError::InvalidRenderState("Uniform buffer not initialized".to_string())
})?;
let image_layout = backend_data
.render_resources
.image_bind_group_layout()
.ok_or_else(|| {
RendererError::InvalidRenderState(
"Image bind group layout not initialized".to_string(),
)
})?;
// Create pipeline layout
#[cfg(feature = "wgpu-29")]
let pipeline_layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
label: Some("Dear ImGui Pipeline Layout"),
bind_group_layouts: &[Some(uniform_layout), Some(image_layout)],
immediate_size: 0,
});
#[cfg(any(feature = "wgpu-27", feature = "wgpu-28"))]
let pipeline_layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
label: Some("Dear ImGui Pipeline Layout"),
bind_group_layouts: &[uniform_layout, image_layout],
#[cfg(feature = "wgpu-28")]
immediate_size: 0,
#[cfg(feature = "wgpu-27")]
push_constant_ranges: &[],
});
// Get shader module
let shader_module = self.shader_manager.get_shader_module()?;
// Create vertex buffer layout
let vertex_buffer_layout = crate::shaders::create_vertex_buffer_layout();
let vertex_buffer_layouts = [vertex_buffer_layout];
// Create vertex state
let vertex_state =
crate::shaders::create_vertex_state(shader_module, &vertex_buffer_layouts);
// Create color target state
let color_target = ColorTargetState {
format: backend_data.render_target_format,
blend: Some(BlendState {
color: BlendComponent {
src_factor: BlendFactor::SrcAlpha,
dst_factor: BlendFactor::OneMinusSrcAlpha,
operation: BlendOperation::Add,
},
alpha: BlendComponent {
src_factor: BlendFactor::One,
dst_factor: BlendFactor::OneMinusSrcAlpha,
operation: BlendOperation::Add,
},
}),
write_mask: ColorWrites::ALL,
};
// Determine if we need gamma correction based on format
let use_gamma_correction = matches!(
backend_data.render_target_format,
TextureFormat::Rgba8UnormSrgb
| TextureFormat::Bgra8UnormSrgb
| TextureFormat::Bc1RgbaUnormSrgb
| TextureFormat::Bc2RgbaUnormSrgb
| TextureFormat::Bc3RgbaUnormSrgb
| TextureFormat::Bc7RgbaUnormSrgb
);
// Create fragment state
let color_targets = [Some(color_target)];
let fragment_state = crate::shaders::create_fragment_state(
shader_module,
&color_targets,
use_gamma_correction,
);
// Create depth stencil state if needed (matches imgui_impl_wgpu.cpp depth-stencil setup)
let depth_stencil = backend_data.depth_stencil_format.map(|format| {
#[cfg(feature = "wgpu-29")]
let state = DepthStencilState {
format,
depth_write_enabled: Some(false), // matches WGPUOptionalBool_False in C++
depth_compare: Some(CompareFunction::Always), // matches WGPUCompareFunction_Always
stencil: StencilState {
front: StencilFaceState {
compare: CompareFunction::Always, // matches WGPUCompareFunction_Always
fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
depth_fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
pass_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
},
back: StencilFaceState {
compare: CompareFunction::Always, // matches WGPUCompareFunction_Always
fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
depth_fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
pass_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
},
read_mask: 0xff, // default value
write_mask: 0xff, // default value
},
bias: DepthBiasState::default(),
};
#[cfg(any(feature = "wgpu-27", feature = "wgpu-28"))]
let state = DepthStencilState {
format,
depth_write_enabled: false, // matches WGPUOptionalBool_False in C++
depth_compare: CompareFunction::Always, // matches WGPUCompareFunction_Always
stencil: StencilState {
front: StencilFaceState {
compare: CompareFunction::Always, // matches WGPUCompareFunction_Always
fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
depth_fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
pass_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
},
back: StencilFaceState {
compare: CompareFunction::Always, // matches WGPUCompareFunction_Always
fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
depth_fail_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
pass_op: StencilOperation::Keep, // matches WGPUStencilOperation_Keep
},
read_mask: 0xff, // default value
write_mask: 0xff, // default value
},
bias: DepthBiasState::default(),
};
state
});
// Create render pipeline
let pipeline = device.create_render_pipeline(&RenderPipelineDescriptor {
label: Some("Dear ImGui Render Pipeline"),
layout: Some(&pipeline_layout),
vertex: vertex_state,
primitive: PrimitiveState {
topology: PrimitiveTopology::TriangleList,
strip_index_format: None,
front_face: FrontFace::Cw,
cull_mode: None,
polygon_mode: PolygonMode::Fill,
unclipped_depth: false,
conservative: false,
},
depth_stencil,
multisample: backend_data.init_info.pipeline_multisample_state,
fragment: Some(fragment_state),
#[cfg(any(feature = "wgpu-28", feature = "wgpu-29"))]
multiview_mask: None,
#[cfg(feature = "wgpu-27")]
multiview: None,
cache: None,
});
backend_data.pipeline_state = Some(pipeline);
Ok(())
}
}