Add a compile-time loop construct to Slang

The basic syntax is:

    $for(i in Range(0,99))
    {
       /* stuff goes here */
    }

Note that the exact form is very restrictive. All that you are allowed to change is `i`, `0`, `99` or `/* stuff goes here */`.

As a tiny bit of syntax sugar, the following should work:

    $for(i in Range(99))
    {
       /* stuff goes here */
    }

Note that the range given is half-open (C++ iterator `[begin,end)` style).
Both the beginning and end of the range must be compile-time constant expressions that Slang knows how to constant-fold.

The implementation will basically generate code for `/* stuff goes here */` N times, once for each value in the half-open range.
Each time, the variable `i` will be replaced with a different compile-time-constant expression.

While I was working on a test case for this, I also found that our build of glslang had an issue with resource limits, so I fixed that.
Clients will need to build a new glslang to use the fix.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/slang/slang-stdlib.cpp b/source/slang/slang-stdlib.cpp
index 3062112c6..b26fc8a8e 100644
--- a/source/slang/slang-stdlib.cpp
+++ b/source/slang/slang-stdlib.cpp
@@ -1603,7 +1603,7 @@ namespace Slang
 
                         if( baseShape != TextureType::ShapeCube )
                         {
-                            sb << "__intrinsic(glsl, \"textureOffset($p, $1)\")\n";
+                            sb << "__intrinsic(glsl, \"textureOffset($p, $1, $2)\")\n";
                             sb << "__intrinsic\n";
                             sb << "T Sample(SamplerState s, ";
                             sb << "float" << kBaseTextureTypes[tt].coordCount + isArray << " location, ";