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improved delta calculations for capped framrates
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This commit is contained in:
Isaac0-dev 2025-07-26 13:30:24 +10:00
parent 46b1a8bbb9
commit 593eb9aafc
1 changed files with 12 additions and 6 deletions
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18
src/pc/pc_main.c
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@ -61,6 +61,8 @@
#include "gfx_dimensions.h"
#include "game/segment2.h"
#include "engine/math_util.h"
#ifdef DISCORD_SDK
#include "pc/discord/discord.h"
#endif
@ -203,18 +205,16 @@ static s32 get_num_frames_to_draw(f64 t, u32 frameLimit) {
static u32 get_refresh_rate() {
if (configFramerateMode == RRM_MANUAL) { return configFrameLimit; }
if (configFramerateMode == RRM_UNLIMITED) { return 3000; } // Has no effect
#ifdef HAVE_SDL2
static u32 refreshRate = 60;
#ifdef HAVE_SDL2
if (!refreshRate) {
SDL_DisplayMode mode;
if (SDL_GetCurrentDisplayMode(0, &mode) == 0) {
refreshRate = (u32) mode.refresh_rate;
}
}
return refreshRate;
#else
return 60;
#endif
return refreshRate;
}
void produce_interpolation_frames_and_delay(void) {
@ -229,15 +229,21 @@ void produce_interpolation_frames_and_delay(void) {
f64 curTime = clock_elapsed_f64();
f64 loopStartTime = curTime;
f64 expectedTime = 0;
u16 frames = 0;
const f64 interpFrameTime = sFrameTime / (f64) numFramesToDraw;
// interpolate and render
// make sure to draw at least one frame to prevent the game from freezing completely
// (including inputs and window events) if the game update duration is greater than 33ms
do {
++frames;
// when we know how many frames to draw, use a precise delta
f64 idealTime = configFramerateMode != RRM_UNLIMITED ? (sFrameTimeStart + interpFrameTime * frames) : curTime;
f32 delta = (
is30Fps ?
1.0f :
MIN(MAX((curTime - sFrameTimeStart) / sFrameTime, 0.f), 1.f)
clamp((idealTime - sFrameTimeStart) / sFrameTime, 0.f, 1.f)
);
gRenderingDelta = delta;
@ -248,7 +254,7 @@ void produce_interpolation_frames_and_delay(void) {
gfx_end_frame_render();
// delay if our framerate is capped
if (!configUncappedFramerate && !configWindow.vsync) {
if (configFramerateMode != RRM_UNLIMITED && !configWindow.vsync) {
f64 now = clock_elapsed_f64();
f64 elapsedTime = now - loopStartTime;
expectedTime += (targetTime - curTime) / (f64) numFramesToDraw;