Maybe this wont be so helpful but...

I would keep the running on max fps, and update game state at
different speed. For example: instead of moving a sprite by 10pixels
on every update and using fps to regulate how much pixels per second
that amounts to, I would let the game run at max fps, but i would
measure how much time passed since last update and move the sprite
accordingly - 100ms passed and game is at slow so move it by 10px,
100ms passed and game is at fast so move it by 20px.

On Tue, May 26, 2009 at 3:55 AM, ericmort19 <barberic19@...> wrote:
>
>
> I am developing a game using UNDelphiX with Delphi 7 and have a problem with
> the DXTimer. The game has 10 game levels and 3 levels of difficulty.
> The game speed should increase in a linear progression from 20 FPS in Level
> 1 Beginner to a max of 40 FPS in Level 10 Expert or whenever the 40 FPS is
> achieved.
> My code is this, where aDifficultyTime is a local variable and FLevel is the
> game level variable with a range of 1..10.
>
> // set game speed - runs at 20..40 FPS
> case FDifficulty of
> gd_Beginner: aDifficultyTime := 0;
> gd_Advanced: aDifficultyTime := 5;
> gd_Expert: aDifficultyTime := 10;
> else aDifficultyTime := 0;
> end;
> DXTimer.Interval := 52 - aDifficultyTime - (FLevel*2);
> if DXTimer.Interval < 25 then DXTimer.Interval := 25; // max 40 FPS
>
> The FPS output runs like this, starting at 16 FPS instead of 20 and jumping
> to 21, 24 and finally a max of 32 :-
>
> Level Beginner - 16 FPS. Should be 20.
> Level Expert - 21 FPS. Should be 25.
> Leve3 Beginner - 21 FPS. Should be 21.
> Leve3 Expert - 21 FPS. Should be 27.
> Leve5 Beginner - 21 FPS. Should be 24.
> Leve5 Expert - 24 FPS. Should be 31.
> Leve8 Beginner - 21 FPS. Should be 28.
> Leve8 Expert - 32 FPS. Should be 38.
> Leve10 Beginner - 21 FPS. Should be 31.
> Leve10 Expert - 32 FPS. Should be 40.
>
> I ran the DX Diagnostics tool from Start>Run>dxdiag and that found no
> problems. Relevant sections of the report below. If I leave the dxdiag
> window open and run the game it behaves as it should with a gradual increase
> in speed as it progresses through the level. When I close the dxdiag window
> the timer resumes it's weird behavior.
>
> Please has anyone any ideas how to fix it.
>
> DX Diagnostics output report - relevant bits.
> ------------------
> System Information
> ------------------
> Time of this report: 5/26/2009, 10:22:48
> Machine name: ERIC-XP3
> Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2
> (2600.xpsp_sp2_rtm.040803-2158)
> Language: English (Regional Setting: English)
> System Manufacturer: GBT___
> System Model: GBTUACPI
> BIOS: Award Modular BIOS v6.00PG
> Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 6000+, MMX, 3DNow (2
> CPUs), ~3.0GHz
> Memory: 2046MB RAM
> Page File: 372MB used, 3566MB available
> Windows Dir: C:\WINDOWS
> DirectX Version: DirectX 9.0c (4.09.0000.0904)
> DX Setup Parameters: Not found
> DxDiag Version: 5.03.2600.2180 32bit Unicode
>
> ------------
> DxDiag Notes
> ------------
> DirectX Files Tab: No problems found.
> Display Tab 1: No problems found.
> Sound Tab 1: No problems found.
> Sound Tab 2: No problems found.
> Sound Tab 3: No problems found.
> Music Tab: No problems found.
> Input Tab: No problems found.
> Network Tab: No problems found.
>
> --------------------
> DirectX Debug Levels
> --------------------
> Direct3D: 0/4 (n/a)
> DirectDraw: 0/4 (retail)
> DirectInput: 0/5 (n/a)
> DirectMusic: 0/5 (n/a)
> DirectPlay: 0/9 (retail)
> DirectSound: 0/5 (retail)
> DirectShow: 0/6 (retail)
>
> ---------------
> Display Devices
> ---------------
> Card name: NVIDIA GeForce 7300 SE/7200 GS
> Manufacturer: NVIDIA
> Chip type: GeForce 7300 SE/7200 GS
> DAC type: Integrated RAMDAC
> Device Key: Enum\PCI\VEN_10DE&DEV_01D3&SUBSYS_82501043&REV_A1
> Display Memory: 512.0 MB
> Current Mode: 1024 x 768 (32 bit) (100Hz)
> Monitor: Philips 109B50
> Monitor Max Res: 1920,1440
> Driver Name: nv4_disp.dll
> Driver Version: 6.14.0011.6218 (English)
> DDI Version: 9 (or higher)
> Driver Attributes: Final Retail
> Driver Date/Size: 6/29/2007 02:43:00, 5690624 bytes
> WHQL Logo'd: n/a
> WHQL Date Stamp: n/a
> VDD: n/a
> Mini VDD: nv4_mini.sys
> Mini VDD Date: 6/29/2007 02:43:00, 6807328 bytes
> Device Identifier: {D7B71E3E-4293-11CF-B96B-5BA200C2CB35}
> Vendor ID: 0x10DE
> Device ID: 0x01D3
> SubSys ID: 0x82501043
> Revision ID: 0x00A1
> Revision ID: 0x00A1
> Video Accel: ModeMPEG2_A ModeMPEG2_B ModeMPEG2_C ModeMPEG2_D ModeWMV9_B
> ModeWMV9_A
> Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}:
> Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0)
> Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
> DeinterlaceTech_PixelAdaptive
> {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY
> DeinterlaceTech_BOBVerticalStretch
> {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,YUY2)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
> {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY
> DeinterlaceTech_BOBVerticalStretch
> {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x3231564e)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
> {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x3231564e)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY
> DeinterlaceTech_BOBVerticalStretch
> {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
> {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e)
> Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB
> VideoProcess_StretchX VideoProcess_StretchY
> DeinterlaceTech_BOBVerticalStretch
> Registry: OK
> DDraw Status: Enabled
> D3D Status: Enabled
> AGP Status: Enabled
> DDraw Test Result: Not run // ran OK when tested
> D3D7 Test Result: Not run // ran OK when tested
> D3D8 Test Result: Not run // ran OK when tested
> D3D9 Test Result: Not run // ran OK when tested
>
> -------------
>
>



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Igor Stojkovic mailto: stojkovic.igor@...
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