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Backends: Rework blending equation to preserve alpha in output buffer accross all backends. (#2693, #2764, #2766, #2873, #3447, #3813, #3816)

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Some of the viewport ideas from #2766 are not in there yet (e.g. Vulkan: setting compositeAlpha based on cap.supportedCompositeAlpha)
This commit is contained in:
ocornut
2021-02-17 19:29:07 +01:00
parent 27a5bdb916
commit bda12e5fdd
11 changed files with 31 additions and 14 deletions
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3
backends/imgui_impl_wgpu.cpp
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@ -12,6 +12,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2021-02-18: Change blending equation to preserve alpha in output buffer.
// 2021-01-28: Initial version.
#include "imgui.h"
@ -638,7 +639,7 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
{
color_state.format = g_renderTargetFormat;
color_state.alphaBlend.operation = WGPUBlendOperation_Add;
color_state.alphaBlend.srcFactor = WGPUBlendFactor_SrcAlpha;
color_state.alphaBlend.srcFactor = WGPUBlendFactor_One;
color_state.alphaBlend.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha;
color_state.colorBlend.operation = WGPUBlendOperation_Add;
color_state.colorBlend.srcFactor = WGPUBlendFactor_SrcAlpha;