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Add fps rate limiter #97

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1 change: 1 addition & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,7 @@ add_object_library_macros(GS_HIRES_OBJS ee/gs/src/gsHires.c
_gsKit_create_passes
gsKit_hires_sync
gsKit_hires_flip
gsKit_hires_flip_ext
gsKit_hires_prepare_bg
gsKit_hires_set_bg
gsKit_hires_init_screen
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8 changes: 8 additions & 0 deletions ee/gs/include/gsCore.h
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Expand Up @@ -82,6 +82,14 @@ struct gsVertex
};
typedef struct gsVertex GSVERTEX;

/// Flip mode for gsKit_hires_flip_ext
typedef enum {
GSFLIP_DIRECT = 0, ///< Flip immediately, no vsync wait
GSFLIP_VSYNC = 1, ///< Wait for vsync before flipping
GSFLIP_RATE_LIMIT_1 = 2, ///< Limit to 60fps (1 vsync per frame)
GSFLIP_RATE_LIMIT_2 = 3 ///< Limit to 30fps (2 vsyncs per frame)
} GSFLIP_MODE;

#ifdef __cplusplus
extern "C" {
#endif
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3 changes: 3 additions & 0 deletions ee/gs/include/gsHires.h
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Expand Up @@ -28,6 +28,9 @@ void gsKit_hires_sync(GSGLOBAL *gsGlobal);
/// Flips Draw Queue
void gsKit_hires_flip(GSGLOBAL *gsGlobal);

/// Flips Draw Queue with specified flip mode
void gsKit_hires_flip_ext(GSGLOBAL *gsGlobal, GSFLIP_MODE mode);

/// Converts PSM and interlacing for use as background image
void gsKit_hires_prepare_bg(GSGLOBAL *gsGlobal, GSTEXTURE * tex);

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27 changes: 27 additions & 0 deletions ee/gs/src/gsHires.c
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Expand Up @@ -260,8 +260,35 @@ void gsKit_hires_sync(GSGLOBAL *gsGlobal)

#if F_gsKit_hires_flip
void gsKit_hires_flip(GSGLOBAL *gsGlobal)
{
gsKit_hires_flip_ext(gsGlobal, GSFLIP_DIRECT);
}
#endif

#if F_gsKit_hires_flip_ext
// State tracking for rate limiting
static u32 __last_flip_vsync_count = 0;

void gsKit_hires_flip_ext(GSGLOBAL *gsGlobal, GSFLIP_MODE mode)
{
u32 iY;
u32 vsync_end;

// Handle vsync waiting based on mode
switch (mode) {
case GSFLIP_DIRECT: vsync_end = __vsync_count; break;
case GSFLIP_VSYNC: vsync_end = __vsync_count + 1; break;
case GSFLIP_RATE_LIMIT_1: vsync_end = __last_flip_vsync_count + 1; break;
case GSFLIP_RATE_LIMIT_2: vsync_end = __last_flip_vsync_count + 2; break;
}

// Wait for required vsyncs
while (__vsync_count < vsync_end) {
WaitSema(__sema_vsync_id);
}

// Update last flip vsync count
__last_flip_vsync_count = __vsync_count;

// HACK: The start of the first displayed line
// this is needed by the hsync interrupt but must be
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