60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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* Framerate counter
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*
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* Calculates the game's current framerate by using osGetTime() and
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* prints it out on the lower left side of the screen.
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*
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* HOW TO USE:
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*
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* Add this include statement to the top of game.c
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*
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* #include "../../enhancements/fps.inc.c"
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*
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* Then, at the end of the while(1) loop in the function thread5_game_loop()
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* add the function call render_fps()
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*
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* That's it! Build the rom file and press L when the game boots up
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* to toggle the FPS counter.
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*/
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// SDK states that 1 cycle takes about 21.33 nanoseconds
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#define SECONDS_PER_CYCLE 0.00000002133f
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#define FPS_COUNTER_X_POS 24
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#define FPS_COUNTER_Y_POS 190
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OSTime gLastOSTime = 0;
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float gFrameTime = 0.0f;
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u16 gFrames = 0;
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u16 gFPS = 0;
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u8 gRenderFPS = FALSE;
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void calculate_frameTime_from_OSTime(OSTime diff) {
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gFrameTime += diff * SECONDS_PER_CYCLE;
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gFrames++;
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}
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void render_fps(void) {
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// Toggle rendering framerate with the L button.
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if (gPlayer1Controller->buttonPressed & L_TRIG) {
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gRenderFPS ^= 1;
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}
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if (gRenderFPS) {
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OSTime newTime = osGetTime();
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calculate_frameTime_from_OSTime(newTime - gLastOSTime);
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// If frame time is longer or equal to a second, update FPS counter.
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if (gFrameTime >= 1.0f) {
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gFPS = gFrames;
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gFrames = 0;
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gFrameTime -= 1.0f;
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}
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print_text_fmt_int(FPS_COUNTER_X_POS, FPS_COUNTER_Y_POS, "FPS %d", gFPS);
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gLastOSTime = newTime;
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}
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}
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