thejayman77
a72aaded22
The fog blend's tex_color*F multiply landed on the texture->color critical path (u_texcache RAM -> u_tex|tex_color -> mult_126 -> raster_pixel_color_q, 46ns, -6.165ns setup). Fog is a proven no-op for the current board scene (96.5% F=255), so pay zero for it here. FOG_ENABLE (default 1, byte-identical fog) added to gs_stub; each fog mux gated (FOG_ENABLE && ras_fge) so FOG_ENABLE=0 constant-folds the entire fog cone away (multiply, FOGCOL adders, s2_fog_f/persp_fog_f5 interp). Threaded through top_psmct32_raster_demo_bram; set FOG_ENABLE(1'b0) on the active GS_SH3_LPDDR_FB board arm (elsif at :1086, the one the QSF profile compiles). Fog stays default-on everywhere else. Verified: FOG_ENABLE=1 fog TBs unchanged PASS; FOG_ENABLE=0 (new tb_gs_fog_disabled + board scene TB) emits raw color = pre-fog datapath; board elaborates clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
retroDE_ps2 Planning Docs
This directory is the working design scaffold for the PS2 core.
Purpose:
- define the intended repository shape before RTL lands,
- define subsystem boundaries before implementation choices harden,
- document what each block owns, what crosses the boundary, and how we will validate it.
Recommended reading order:
- repo_layout.md
- phase0_checklist.md
- contracts/README.md
- stub_module_plan.md
- wave2_dma_gif_plan.md
- wave25_memory_backed_dma_plan.md
- wave26_multi_beat_dma_plan.md
Relationship to references/:
references/is the research library.docs/is the project-definition layer.
Rule of thumb:
- If a file explains PS2 hardware as it exists, it belongs under
references/. - If a file explains how
retroDE_ps2intends to model, partition, or validate that hardware, it belongs underdocs/.