ps14toATIfs

Overview

ps14toATIfs is a little C/C++ library I've whipped up that parses DirectX 8.1 pixel shaders version 1.4, and translates them to OpenGL calls using the ATI_fragment_shader extension. I know ATI offers the ATI_text_fragment_shader extension, but it's syntax is proprietary and not compatible with DirectX 8.1. The largest benefit to using ATI_text_fragment_shader is, however, the fact that it uses the standard ARB interface to managing programs (like ARB_vertex_program and ARB_fragment_program) using the target GL_TEXT_FRAGMENT_SHADER_ATI. Using this library will allow you to directly use DirectX pixel shaders 1.4 in an OpenGL program, with a few exceptions that are noted below.

What it can't do

The texdepth and texkill instructions are not allowed. This is due to ATI_fragment_shader's lack of support for the operations these instructions perform.

The bem instruction is not allowed. This is also due to lack of support for the instruction in OpenGL. Plus I think it's stupid. :)

Swizzling and projecting the source of a texture address instruction at the same time. ATI_fragment_shader allows 6 types of swizzle for the source (STR, STQ, STR_DR, STR_DQ, STRQ, STRQ_DQ). So instructions like these are not allowed:

texld   r0, t0_dz.xyw
texcrd  r0, t0_dw.xyz

Example of usage

Using this library is a snap. Note: The library does not initialize the ATI_fragment_shader extension for you. You must do this on your own.

GLuint shader = glGenFragmentShadersATI(1);
glBindFragmentShaderATI(shader);

/* program = a character array containing the pixel shader text */

glBeginFragmentShaderATI();
int error = ps14toATIFragmentShader(program); /* return of non-zero == error */
glEndFragmentShaderATI();

/* check for errors */
if(error)
{
   int errc = ps14toATIfs_GetErrorCount();
   for(int i = 0; i < errc; i++)
      fprintf(stderr, "%s\n", ps14toATIfs_GetErrorString(i));
}

That's all there is to it.

Download

Latest version: 0.03
Changes since 0.02:

Fixed texture register swizzle detection

Added missing STRQ (.xyzw) and STRQ_DQ (_dw.xyzw) texture register swizzles

Misc. code cleanup

Fixed licesencing issues

source (tar.gz)

You will need to have bison and flex installed to compile. For windows users, there are win32 ports of these programs available here as are a few other usefull GNU command line programs. I've only compiled this code with gcc. It may or may not compile with MSVC. I don't know, I don't own it. I'm not offering pre-compiled binaries. So don't ask. You're on your own :)

Contact

If you would like to contact me for whatever reason (bug reports, patches, etc...) send email to:
Be sure to put "ps14toATIfs" somewhere in the subject line. Do not abuse my in-box. I don't want to hear about compiling issues or anything of that sort. I don't care. :)