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P4: Lab: a background mission's $Environment Map is never used

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评估

难度
2/5
预计耗时
半天
新手友好度
66/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
cpp
领域
computer-graphics, game-dev

调研方向

从 LabRenderer::useBackground 开始，这里会读取任务的 $Environment Map 到 envmap_name，但实际加载的是 The_mission.envmap_name。与 starfield.cpp 中的 environment_map_gen 比较，然后检查紧随其后的 ENVMAP > 1 测试。当实验室中的飞船呈现出背景任务的环境贴图颜色并与任务一致时，即完成。测试需要 cubemap 任务和 OpenGL 调试构建。

由索引模型根据 Issue 内容生成。

描述

This is minor: it only affects the F3 lab's preview, not missions.

Problem

When you pick a mission as the lab's background, the lab loads that mission's stars, suns and bitmaps but ignores its $Environment Map. Ships in the lab don't reflect the environment map the mission names, so the lab preview doesn't match what the ship looks like in that mission.

Steps to reproduce

  1. Current master (8afa31842), debug build, Linux, OpenGL, MediaVPs 5.0.2.
  2. Use a mission whose $Environment Map is a cubemap with obvious colors. I used a test mission with a 64x64 cubemap that has one bright color per face.
  3. Open the lab (F3), show a GTC Fenris, then pick that mission under Mission Background.
  4. Compare with the same Fenris in that mission.

Expected vs. actual behavior

Expected: the Fenris in the lab picks up the environment map's colors, like it does in the mission.

Actual: the background loads (the stars appear), but the hull stays plain grey. In the mission, the same map tints the whole hull.

From reading the code: LabRenderer::useBackground reads the mission's $Environment Map into a local envmap_name, but then loads The_mission.envmap_name instead, which in the lab is empty or left over from the last mission played. So the background's map is never loaded. I haven't tested the case where the leftover name points at a flat (non-cubemap) texture; by reading, it could hit the same OpenGL crash as #2245.

Proposed fixes

  1. Load envmap_name (the name just read) instead of The_mission.envmap_name, and change the ENVMAP > 1 check right after it to >= 0.
  2. Same as 1, plus the cubemap check from #7930, so a flat texture falls back to the generated map in the lab too.
  3. Share one helper between the lab and environment_map_gen in starfield.cpp, so both load and check the mission's environment map the same way.
主要语言
C++
星标
488
派生
184
平均合并
2 天 2 小时
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