mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -04:00
Matthew Stanley
3cfcdaba17
Always-on ring captures every GP0 command (header + first 6 payload words) stamped with the frame number issued. Hooked at gp0_execute_command() for fixed-length commands and at the polyline start path for variable-length ones. ~70 MB at 1 048 576 entries (34 bytes/entry); lazy-allocated on first record. New debug-server commands: - gpu_ring_stats: total/capacity/oldest+newest frame in buffer - gpu_frame_dump frame=N count=M: per-frame GP0 entries with raw words Designed per CLAUDE.md ring-buffer rule (CLAUDE.md global #2): capture is continuous; observers query a window of interest post-hoc. No arming, no timed attach. Use case driving this: fuzzy menu text bug on Tomba title screen (TombaRecomp ISSUES.md #3 'D'). Lifetime opcode counts couldn't distinguish which 0x64/0x2C calls draw the menu vs the static text. With per-frame dump we can now show that frame N has 88 GP0 commands and isolate the 6 0x2C entries that render with degenerate top-right vertices (= the fuzzy text). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/* gpu.h — PS1 GPU hardware simulation (Phase 3).
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*
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* Implements GPUSTAT, GP0, GP1, and 1024x512 16-bit VRAM.
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* No rendering to screen — just correct hardware state transitions.
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*/
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#ifndef PSXRECOMP_V4_GPU_H
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#define PSXRECOMP_V4_GPU_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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void gpu_init(void);
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uint32_t gpu_read_gpustat(void); /* 0x1F801814 read */
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uint32_t gpu_read_gpuread(void); /* 0x1F801810 read */
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void gpu_write_gp0(uint32_t val); /* 0x1F801810 write */
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void gpu_write_gp1(uint32_t val); /* 0x1F801814 write */
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void gpu_vblank_tick(void); /* Toggle LCF, called at each simulated vblank */
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/* Display presentation accessors (Phase 3). */
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const uint16_t* gpu_get_vram(void); /* Pointer to 1024x512 16-bit VRAM */
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typedef struct {
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uint32_t display_x, display_y; /* VRAM start of display area (GP1(05h)) */
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uint32_t width, height; /* Derived from display mode + ranges */
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int disabled; /* GP1(03h) display disable flag */
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} GpuDisplayInfo;
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void gpu_get_display_info(GpuDisplayInfo* out);
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uint64_t gpu_get_gp0_count(void); /* Total GP0 writes since init */
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void gpu_get_gp0_stats(uint64_t* nop, uint64_t* fill, uint64_t* draw, uint64_t* env, uint64_t* copy);
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typedef struct {
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uint32_t left, top, right, bottom;
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int32_t offset_x, offset_y;
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} GpuDrawArea;
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void gpu_get_draw_area(GpuDrawArea* out);
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uint16_t gpu_vram_peek(int x, int y);
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/* Shaded quad vertex capture (Phase 4.5 debug). */
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typedef struct {
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int32_t vx[4], vy[4];
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uint32_t color[4];
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} GpuSqCapEntry;
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void gpu_arm_shaded_quad_capture(void);
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int gpu_get_shaded_quad_capture(const GpuSqCapEntry** out);
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/* Per-frame GP0 command ring (always-on; query via debug server).
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* Each entry records the GP0 command header + up to 6 payload words
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* (longer commands like 0x3C shaded textured quad are truncated to 6).
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* Stamped with the s_frame_count value at issue time so a debug
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* client can pull all commands for any frame in the ring window. */
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#define GPU_GP0_RING_MAX_WORDS 6
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typedef struct {
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uint32_t frame;
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uint32_t seq;
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uint8_t opcode;
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uint8_t n_words; /* total command length; >MAX means truncated */
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uint16_t pad;
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uint32_t cmd[GPU_GP0_RING_MAX_WORDS];
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} GpuGp0RingEntry;
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uint64_t gpu_gp0_ring_total(void);
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uint32_t gpu_gp0_ring_capacity(void);
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uint32_t gpu_gp0_ring_max_words(void);
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int gpu_gp0_ring_dump_frame(uint32_t frame, GpuGp0RingEntry *out, int max_out);
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void gpu_gp0_ring_frame_span(uint32_t *out_oldest, uint32_t *out_newest);
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/* Vblank presentation callback — called from gpu_vblank_tick(). */
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typedef void (*gpu_vblank_cb)(void);
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void gpu_set_vblank_callback(gpu_vblank_cb cb);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSXRECOMP_V4_GPU_H */
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