yep, I just need to understand when (and how) flip the y-axis

SST_YORIGIN is bit 17. You can do what openglide does (and what wd said 😀), swap top and bottom in the glOrtho call.

yeah, thanks 😀 actually that's the least of the issues atm, since there's much left to do, so I didn't bother 😜

hey guys. Before I post i would just like to thank kekko and all the people working on this great program. But i have a slight prob. I downloaded the souce from the fist post (by kekko) extract it then put a normal dosbox Configure files in the voodoo source. When making (in MinGW+MSYS) I get this at the end:
Voodoo.h:9:14 error: a storage class can only specified for objects and functions
make[3]: *** [memory.o] Error 1
make[3]: Leaving Directoy '/c/dosbox/src/hardware
make[2]: *** [install-recursive] Error 1
make[2]: Leaving Directory '/c/dosbox/src/hadware
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory '/c/dosbox/src/hardware
make: *** [install-recursive] Error 1

Now im not a programmer but to me it seems voodoo.h is screwing with things. Ive tried the updated voodoo.h etc but even they do it.

Thanks for any help
-Quaker
EDIT: tried to do the same thing with new stable source. instead no voodoo.h error or memory.o error. but an all recursive error for dosbox.exe. Man compilings hard... Or maybe im a noob!!! 😒

need a hand with paletted textures in opengl, and with textures in general;
this is the code for 8bpp textures (mostly copy/paste from opengl tutorials):

1				texptr = (GLvoid *)&v->tmu[0].ram[(texbase) & v->tmu[0].mask];
2
3				glEnable(GL_TEXTURE_2D);
4				glEnable(GL_COLOR_TABLE);
5				glEnable(GL_SHARED_TEXTURE_PALETTE_EXT);
6				PFNGLCOLORTABLEEXTPROC glColorTableEXT = (PFNGLCOLORTABLEEXTPROC) wglGetProcAddress("glColorTableEXT");
7				glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
8				glBindTexture(GL_TEXTURE_2D, texID);
9				glColorTableEXT(GL_TEXTURE_2D, GL_RGBA8, 256, GL_RGBA, GL_UNSIGNED_BYTE, v->tmu[0].lookup);
10				glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, smax, tmax, 0, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, texptr);

Is GL_ARB_imaging returned for the GL_EXTENSIONS query? Is glColorTableEXT zero when extracted?

1) ?? 2) no, is not zero
do you mean it may be not supported by hardware and such?

A call to

1const char * extensionString=(const char *)glGetString(GL_EXTENSIONS);

should contain GL_ARB_imaging if the color table functions are supported,
see http://www.opengl.org/sdk/docs/man/xhtml/glColorTable.xml .

But think the pointer should be zero or unmodified if it isn't supported.

I'm trying to convert textures to 32bpp on the fly, so I won't need palette handling, just to make it work. but it doesn't work at all.
I guess there's something missing in the sequence of functions I call.
Hoped in gulikoza's help, which showed interest in it, but he's missing at this moment...

Throw in a bunch of glGetError calls, does any of them complain?

no, all functions report glGetError = 0. apparently my card has no problems with paletted textures.
anyway, I'm now trying something simpler, with 32bpp textures and random data from emulated texture ram:

1		smax = tmax = 256;
2		glEnable( GL_TEXTURE_2D );
3		texID = 13;
4		glGenTextures(1, &texID);
5		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
6		glBindTexture(GL_TEXTURE_2D, texID);
7		glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
8		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, smax, tmax, 0, GL_RGB, GL_UNSIGNED_BYTE, (GLvoid *)v->tmu[0].ram);
9
10		glEnable (GL_TEXTURE_2D);
11		glBindTexture (GL_TEXTURE_2D, texID);
12		glBegin(GL_TRIANGLES);
13		glTexCoord2f(0.0,0.0); glVertex2f((float)v->fbi.ax/16, (float)v->fbi.ay/16); 
14		glTexCoord2f(0.0,1.0f); glVertex2f((float)v->fbi.bx/16, (float)v->fbi.by/16);
15		glTexCoord2f(1.0f,0.0); glVertex2f((float)v->fbi.cx/16, (float)v->fbi.cy/16); 
16
17		glEnd();
18		glDisable (GL_TEXTURE_2D);
19		glDeleteTextures(1,&texID);

it shows nothing of course. can you see what's wrong?

Use glTexEnvi instead of glTexEnvf.

Also set the following ones (same place):

1glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
2glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
3glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
4glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);

unless you got those in some setup routines already and don't change them.

Then set the general color to white, like just before the GL_TRIANGLES,
and try disabling blending if that may be used elsewhere.

What wd said 😀
The texture won't work because it is incomplete. The default GL_TEXTURE_MIN_FILTER state is GL_NEAREST_MIPMAP_LINEAR so GL will consider the texture incomplete as long as you don't create the mipmaps.

glTexParameter is per texture object state so it has to be set for every glGenTextures() object.

thank you both. it started to show something 😀

glTexParameter is per texture object state so it has to be set for every glGenTextures() object.

Sorry, you're right, it won't work in a "setup once only" fashion.

since writing abap programs the whole day makes me more dumb everyday, I'm getting confused even with fixed point to float conversion with c language.
I have the starting values of s,t and deltas along x,y.
the original s,t data and deltas are 16.32 fixed point
x,y data are in 12.4 fixed point format
I need to get s,t for the three triangle vertices:

1		float scale = (float)0xffffffff;
2		s0 = (float)((float)extra->starts0/scale);
3		t0 = (float)((float)extra->startt0/scale);
4
5		int dx = (v->fbi.bx >> 4) - (v->fbi.ax >> 4);
6		int dy = (v->fbi.by >> 4) - (v->fbi.ay >> 4);
7		s1 = (float)((float)(extra->starts0 + dy * extra->ds0dy + dx * extra->ds0dx)/scale);
8		t1 = (float)((float)(extra->startt0 + dy * extra->dt0dy + dx * extra->dt0dx)/scale);
9		dx = (v->fbi.cx >> 4) - (v->fbi.ax >> 4);
10		dy = (v->fbi.cy >> 4) - (v->fbi.ay >> 4);
11		s2 = (float)((float)(extra->starts0 + dy * extra->ds0dy + dx * extra->ds0dx)/scale);
12		t2 = (float)((float)(extra->startt0 + dy * extra->dt0dy + dx * extra->dt0dx)/scale);

can you see something wrong in this code?
thanks for the patience 😀

For me the 'Holy Grail' of simming would be able to run the 3dFX version of EF2000 on modern hardware using DosBox. This hasn't been possible since the game is written to talk directly to a Voodoo card rather than using glide.

Skimming through this thread indicates that with a certain amount of configuration, this is now possible. Can this really be true?

Did you miss the screenshot on page 10? 😁

Not at all. 😀

It was that screenshot that prompted the question.

I'm using the standard version of DosBox for EF2000 but I guess I'll need to compile some special version to get the 3dFX support.
Before I learn how to do that, I'd like to make sure that it really is possible and that I haven't misunderstood what is going on here.

EF2000 with 3dfx it's for real
- apply this patch to svn sources
- add these lines to bottom of voodoo_raster.h file
- build
- take-off 😀