From 02f77bbf12981abe376b2d5987684224a50ae4b2 Mon Sep 17 00:00:00 2001
From: Tim Foley <tfoley@nvidia.com>
Date: Wed, 12 Jul 2017 14:21:52 -0700
Subject: Add ability for intrinsics to require GLSL extensions

When cross-compiling, we need to detect when an intrinsic is used that required non-default GLSL capabilities and emit an appropriate `#extension ... : require` line.

I'm handling this by attaching a custom modifier to declarations that require an extension in order to be callable.
---
 source/slang/slang-stdlib.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'source/slang/slang-stdlib.cpp')

diff --git a/source/slang/slang-stdlib.cpp b/source/slang/slang-stdlib.cpp
index bcc87b201..563f5a015 100644
--- a/source/slang/slang-stdlib.cpp
+++ b/source/slang/slang-stdlib.cpp
@@ -413,27 +413,33 @@ __intrinsic
 matrix<T,N,M> ddx(matrix<T,N,M> x);
 
 __generic<T : __BuiltinFloatingPointType>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdxCoarse)
 __intrinsic
 T ddx_coarse(T x);
 __generic<T : __BuiltinFloatingPointType, let N : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdxCoarse)
 __intrinsic
 vector<T,N> ddx_coarse(vector<T,N> x);
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdxCoarse)
 __intrinsic
 matrix<T,N,M> ddx_coarse(matrix<T,N,M> x);
 
 __generic<T : __BuiltinFloatingPointType>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdxFine)
 __intrinsic
 T ddx_fine(T x);
 __generic<T : __BuiltinFloatingPointType, let N : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdxFine)
 __intrinsic
 vector<T,N> ddx_fine(vector<T,N> x);
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdxFine)
 __intrinsic
 matrix<T,N,M> ddx_fine(matrix<T,N,M> x);
@@ -452,27 +458,33 @@ __intrinsic
  matrix<T,N,M> ddy(matrix<T,N,M> x);
 
 __generic<T : __BuiltinFloatingPointType>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdyCoarse)
 __intrinsic
 T ddy_coarse(T x);
 __generic<T : __BuiltinFloatingPointType, let N : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdyCoarse)
 __intrinsic
 vector<T,N> ddy_coarse(vector<T,N> x);
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdyCoarse)
 __intrinsic
 matrix<T,N,M> ddy_coarse(matrix<T,N,M> x);
 
 __generic<T : __BuiltinFloatingPointType>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdyFine)
 __intrinsic
 T ddy_fine(T x);
 __generic<T : __BuiltinFloatingPointType, let N : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdyFine)
 __intrinsic
 vector<T,N> ddy_fine(vector<T,N> x);
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int>
+__glsl_extension(GL_ARB_derivative_control)
 __intrinsic(glsl, dFdyFine)
 __intrinsic
 matrix<T,N,M> ddy_fine(matrix<T,N,M> x);
-- 
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