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Backends: Vulkan: support rendering inside passes with multiple color attachments. (#9574)

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We render to the first color attachment and leave the other ones untouched (color write mask 0).
With dynamic rendering, create one blend attachment state per PipelineRenderingCreateInfo::colorAttachmentCount. Requires the independentBlend device feature.
This commit is contained in:
tqjxlm 2026-10-06 14:09:10 +01:00 committed by ocornut
parent 4989b4c754
commit 71fc553bc4
3 changed files with 16 additions and 3 deletions
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14
backends/imgui_impl_vulkan.cpp
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@ -27,6 +27,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-10-06: Added support for dynamic rendering with multiple color attachments (PipelineRenderingCreateInfo.colorAttachmentCount > 1): we render to the first one and leave the others untouched. (#9574)
// 2026-09-07: Round framebuffer dimensions to the nearest integer instead of truncating them. (#9538, 9515, #8628)
// 2026-09-03: Added for support for multiple Vulkan contexts with custom loaders. (#6616)
// 2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
@ -1062,7 +1063,14 @@ static VkPipeline ImGui_ImplVulkan_CreatePipeline(VkDevice device, const VkAlloc
ms_info.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
ms_info.rasterizationSamples = (info->MSAASamples != 0) ? info->MSAASamples : VK_SAMPLE_COUNT_1_BIT;
VkPipelineColorBlendAttachmentState color_attachment[1] = {};
// Blend into the first color attachment. With dynamic rendering, other color attachments of the rendering are left untouched (requires independentBlend feature).
int color_attachment_count = 1;
#ifdef IMGUI_IMPL_VULKAN_HAS_DYNAMIC_RENDERING
if (bd->VulkanInitInfo.UseDynamicRendering && info->PipelineRenderingCreateInfo.colorAttachmentCount > 1)
color_attachment_count = (int)info->PipelineRenderingCreateInfo.colorAttachmentCount;
#endif
ImVector<VkPipelineColorBlendAttachmentState> color_attachment;
color_attachment.resize(color_attachment_count, VkPipelineColorBlendAttachmentState()); // colorWriteMask = 0
color_attachment[0].blendEnable = VK_TRUE;
color_attachment[0].srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
color_attachment[0].dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
@ -1077,8 +1085,8 @@ static VkPipeline ImGui_ImplVulkan_CreatePipeline(VkDevice device, const VkAlloc
VkPipelineColorBlendStateCreateInfo blend_info = {};
blend_info.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
blend_info.attachmentCount = 1;
blend_info.pAttachments = color_attachment;
blend_info.attachmentCount = (uint32_t)color_attachment.Size;
blend_info.pAttachments = color_attachment.Data;
ImVector<VkDynamicState> dynamic_states = info->ExtraDynamicStates;
dynamic_states.push_back(VK_DYNAMIC_STATE_VIEWPORT);

1
backends/imgui_impl_vulkan.h
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@ -101,6 +101,7 @@ struct ImGui_ImplVulkan_PipelineInfo
// - As an convenience, by setting DescriptorPoolSize > 0 the backend will create one for you.
// - About dynamic rendering:
// - When using dynamic rendering, set UseDynamicRendering=true + fill PipelineInfoMain.PipelineRenderingCreateInfo structure.
// - PipelineRenderingCreateInfo may describe multiple color attachments: we render to the first one and leave the others untouched. This requires the 'independentBlend' device feature.
struct ImGui_ImplVulkan_InitInfo
{
uint32_t ApiVersion; // Fill with API version of Instance, e.g. VK_API_VERSION_1_3 or your value of VkApplicationInfo::apiVersion. May be lower than header version (VK_HEADER_VERSION_COMPLETE)

4
docs/CHANGELOG.txt
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@ -171,6 +171,10 @@ Other Changes:
Note: this callback is only supported by selected rendering backends: most other graphics API
don't have the equivalent of `SDL_SetTextureScaleMode()` and the callback won't work with them.
- Vulkan: added for support for multiple Vulkan contexts with custom loaders. (#6616) [@lstalmir]
- Vulkan: added support for rendering inside a render pass with multiple color attachments
(e.g. when merged with other passes): we render to the first color attachment and leave the
other ones untouched. (with dynamic rendering, `PipelineRenderingCreateInfo` may describe multiple
color attachments. This requires the `independentBlend` device feature). (#9574) [@tqjxlm]
- WebGPU: fixed passing non-integer sizes to `wgpuRenderPassEncoderSetViewport()`
when `FramebufferScale` is >1.0f. (#9515, #8628) [@WayU]
- WebGPU: update to build with wgpu-native 29.0+. (#9377, #9532, #9530) [@lucascompython, @ivan-enzhaev]