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Adds SaveVulkanImageAsPNG to the shared vk_renderer, mirroring SaveMetalTextureAsPNG. Wires --screenshot / --auto-exit into the main loop of every Vulkan project: frameIndex tracking, auto-exit guard updated to respect screenshotFrame, and screenshot block inserted between WaitForGpu and SwapchainPresent. Also adds bitmap.h/bitmap.cpp to each project's CMakeLists (and the stb include path to early raytracing projects that were missing it). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
SaveVulkanImageAsPNG()tovk_renderer.h/cpp, mirroring the existingSaveMetalTextureAsPNG. It creates a CPU-readable staging buffer, transitions the swapchain image toTRANSFER_SRC, copies viavkCmdCopyImageToBuffer, transitions back toPRESENT, swaps BGRA→RGBA channels, forces alpha to 255, and saves withBitmapRGBA8u::Save()--screenshot <path> [frame]and the updated--auto-exitguard into every Vulkan project's main loop (43 projects across geometry, pbr, texture, raytracing, and io categories)bitmap.h/bitmap.cppto each project's CMakeLists, and thestbinclude path to the early raytracing projects (000–006) that were missing itTest plan
./101_color_cube_vulkan --screenshot /tmp/out.png 0— captures frame 0, exits immediately, produces a valid 1280×720 RGBA PNG./030_raytracing_path_trace_vulkan --screenshot /tmp/out.png 100— runs to frame 100, captures, exits./031_raytracing_path_trace_pbr_vulkan --screenshot /tmp/out.png 100— same--auto-exitwithout a frame target still exits after N seconds as before🤖 Generated with Claude Code