Orkuncakilkaya a674c9b372 fix(render3d): Vulkan exposure, foliage depth and meadow alpha ...

Three things the first Vulkan frames on the RTX 3070 Ti showed against OpenGL on the same PC:

- Exposure: the adaptation pass reads the HDR scene's smallest mip, and a render target made
  without pixels had one level, so exposure came from a single texel. A target asked for mipmaps
  now grows a full chain (level 0 kept), and passes draw through level-0 views keyed by the
  image's generation.
- Foliage: the depth prepass and the lit pass (depth EQUAL) are different variants. Vulkan vertex
  stages now declare an invariant gl_Position so both land on the same depth.
- Alpha to coverage is enabled only on a multisampled pass. OpenGL ignores it without MSAA; Vulkan
  with one sample dropped every fragment under half alpha.

vk_resources also checks a big-endian 16-bit RGB upload (a normal map). VKRES OK; ludic-dev test
140 passed; the PC's Vulkan frame is validation-clean; OpenGL frames byte-identical at the five
viewpoints with 59 self-tests passing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

2026-09-15 12:29:24 +03:00

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