nxPascal

[Rodrigo Robles]

edit: I still don't know how i'd add musics. Looked into OpenAL playing but didn't get anything working. Tips?

OpenAL was designed to work with raw sound files like WAV. It doesn't have support for music files like MP3 or OGG. We should code the player... Fortunately Ivo Steinmann did this work for us. The project Mundo uses it. There is two units, ogg.pas and vorbis.pas, you can find it at http://gamemundo.svn.sourceforge.net...nk/src/client/

[cst_zf]

Can you tell me how to show fade-in and fade-out effect with nxPascal?

[code_glitch]

Hay all nxPascal contributors, a new post slipped the mod net while I was away... See above.

Can you tell me how to show fade-in and fade-out effect with nxPascal?

Cheers.

[User137]

What is mod net?

For the problem there is many ways, but by fading you propably mean fading whole screen to black and back in to new screen.

In 2D mode you can accurately draw a faded black rectangle on top of other graphics, or you can use black glClearColor (is default) and change alpha color of all your graphics. Also to draw rect in solid color you need to disable texture.

tex.Disable;
  nx.Enable2D;
  nx.SetColor(0,0,0,fade);
  nx.RectT(0,0,nx.Width,nx.Height);
  nx.Disable2D;
  tex.Enable;

[code_glitch]

What is mod net?

Simply the net in which I catch spam and other nasties and approve posts from new users. Its the reason why you see a nice clean PGD that's viagra add free and clutter free from spam - there can be anywhere from 5-50 posts to delete per day.

[cst_zf]

FrameBuffer in src_demos/delphi_demos reports an AV exception.

[User137]

FrameBuffer in src_demos/delphi_demos reports an AV exception.

Sorry i can't reproduce the AV with Delphi 7. However nxGL is not catching OpenGL errors for unsupported video cards/drivers at the moment.

New addition to nxPascal and updated source download link. This is what i mentioned earlier, what i now call TQuadTexture. By adding nxGLExtra in uses-list lets you use memory optimized textures with rotation and scaling. TQuadTexture uses TGLTextureSet for holding 1-4 textures that are fitted for odd and any texture size, like 260x550 would define 4 power of 2 textures and use memory of 260x576 pixels (256+4 x 512+64).

Normally using GL_NEAREST has no issues with scaling, but with linear filtering there is TDX-feature in use by default that makes visible line-errors between textures disappear.

To use, simply have variable qt: TQuadTexture; somewhere, and

qt:=TQuadTexture.Create('test.png', true); // Loads with transparency on
..
nx.SetColor(1,1,1); // Use white color
qt.Draw(0, 0); // Simple draw in point (0,0). Textures are set automatically.

[cst_zf]

What is mod net?

For the problem there is many ways, but by fading you propably mean fading whole screen to black and back in to new screen.

In 2D mode you can accurately draw a faded black rectangle on top of other graphics, or you can use black glClearColor (is default) and change alpha color of all your graphics. Also to draw rect in solid color you need to disable texture.

tex.Disable;
  nx.Enable2D;
  nx.SetColor(0,0,0,fade);
  nx.RectT(0,0,nx.Width,nx.Height);
  nx.Disable2D;
  tex.Enable;

I means fading-out rendering a graphics with alpha value from 1.0 to 0.0 gradually and fading-in from 0.0 to 1.0.
That is a useful effect in some situations.

in this question, i need a procedure like DrawAlpha(left, top, width, height, alphavalue)

[User137]

I just got a weird theory to optimize texture memory... There are times when you just need textures that are not power of 2, for example odd 300x200 image. nxPascal can currently load that as either scaled to nearby size (256x256 in this case) or pixel-perfectly unaltered but fit in 512x256 "frame". However the "frame" will in this case waste alot of unused memory.

What i came up with (as just idea so far), is that i'd have 2 integer (word) variables per texture: XPart, YPart. The loader would calculate perfect fit for image that is divided in 1, 2 or 4 subtextures. That 300x200 would be divided in 2 parts to make as whole a 320x256 "frame", because the height cannot be split in 2:
256x256, 64x256

If i count memory saving for RGBA image:
300x200 originally as 512x256 "frame" needs 524288 bytes.
2 subtextures need 262144 + 65536 = 327680 bytes
which is 62.5% of memory that would normally be reserved.

Obviously this will need draw functions to adapt to subtextures but it shouldn't be problem. 3D model surface would be unable to use this well, but models should always use the scaling option anyway for repeatability.
Edit: Actually it is big problem if want to support patterned drawing... I'd propably disable/ignore patterns when this is used.

Also, i just got BASS musics working with Lazarus so that's what i'll be using. Need to make a class wrapper to it to ease the procedural DLL header unit.

[User137]

Decided to make another video. Combination of various features, first off background is 800x600 QuadTexture. Followed by 2 particle launchers at bottom corner, from which right side is a clone of left one. Mouse cursor drops snowflakes which have gravity applied to them. Then there are 3 trail effects also part of particle engine.

Top top it off, all of that is drawn only in framebuffer. There is a 50x50 grid of indexed GL_QUADS vertexarray, which acts as screen. This let me do a "collapse" effect at where blue trail is moving, basically the grid bends towards it like spacetime

Background music comes also from the application, by nxBass unit, that is some of BASS library simplified to OOP way of programming.
This is all there is to it in main program, and it can handle alot of formats:

  bassSound:=TBassEngine.Create(handle);
  if not bassSound.CheckErrors then begin
    bassSound.Add('music','data'+PathChar+'test.s3m').  Play;
  end;

Wireframe option is added to render settings. Unfortunately i can't upload engine sources yet because this broke my model demo that used placeholder particletype. 3D particle rendering isn't ready yet. But adding me to MSN or asking with private message always works and i can send anything.

Compiled demo added to attachments, let me know if there are any problems running it