Implement 8.14-8.19 of OpenGL-GLSL specification

The following PR implements 8.14-8.19 of the [OpenGL-GLSL specification](https://registry.khronos.org/OpenGL/specs/gl/GLSLangSpec.4.60.pdf).

Fully implements all functions and built-in type's, resolves https://github.com/shader-slang/slang/issues/3692 for GLSL & SPRI-V targets.

_Notes:_
Testing Tools:
* Fragment shaders cannot test computational results. Only OpCodes are checked for proper emitting.

Implementation Notes:
* SubpassInput requires an unknown image format.
* SubpassInput is disjoint from TextureType: __SubpassImpl (.slang) & SubpassInputType (Compiler) to reduce code generation required.
* SubpassInput required an additional input layout modifier, input_attachment_index, this was added as a new parameter binding attribute. Since the following qualifiers can overlap with different resources (`layout(input_attachment_index = 0, binding = 0, set = 0)`) input_attachment_index is checked for overlapping resource bindings separately from other qualifiers with `LayoutResourceKind::InputAttachmentIndex`.
* `GLSLInputAttachmentIndexLayoutModifier` was added to enforce function parameters only accepting `in` decorated variables.
* `in` decorated variables needed to have emitting modified to allow directly emitting the variable into function calls if used as a parameter, normally Slang has a "global variable" shadow as a "global parameter" through a copy. This does not work and is solved using `GlobalVariableShadowingGlobalParameterDecoration` to build a relationship of "global variable" to "global parameter", we then resolve this relationship and replace "global variable" uses later in compile.
* `AtomicCounterMemory` memory-constraint requires `OpCapability AtomicStorage`, `AtomicStorage` is invalid for Vulkan targets. glslang outputs for `barrier`, `memoryBarrier`, and `groupMemoryBarrier` `AtomicCounterMemory` as a memory constraint. This compiles as valid SPIR-V for Vulkan since `OpCapability AtomicStorage` is not declared. This behavior of glslang is undefined as per [3.31.Capability of the SPIR-V specification](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#_capability). We will omit `AtomicCounterMemory` from our barrier calls.

1 files changed, 17 insertions, 6 deletions

diff --git a/source/slang/slang-capabilities.capdef b/source/slang/slang-capabilities.capdef
index b8d97d021..b83585c5c 100644
--- a/source/slang/slang-capabilities.capdef
+++ b/source/slang/slang-capabilities.capdef
@@ -65,7 +65,7 @@ alias any_target = hlsl | glsl | c | cpp | cuda | spirv;
 alias any_textual_target = hlsl | glsl | c | cpp | cuda;
 alias any_gfx_target = hlsl | glsl | spirv;
 alias any_cpp_target = cpp | cuda;
-
+alias glsl_spirv = glsl | spirv;
 // Capabilities that stand for target spirv version for GLSL backend.
 // These are not compilation targets.
 def glsl_spirv_1_0 : glsl;
@@ -109,6 +109,10 @@ def _sm_6_7 : _sm_6_6;
 
 def hlsl_nvapi : hlsl;
 
+// stage alias
+alias tess_control = hull;
+alias tess_eval = domain;
+
 // SPIRV extensions.
 
 def SPV_EXT_fragment_shader_interlock : spirv_1_0;
@@ -249,6 +253,12 @@ alias GL_NV_ray_tracing = GL_EXT_ray_tracing;
 
 // Define feature names
 
+alias tess_control_gfx = tess_control + any_gfx_target; 
+alias tess_eval_gfx = tess_control + any_gfx_target; 
+alias fragment_gfx = fragment + any_gfx_target;
+alias compute_gfx = compute + any_gfx_target;
+alias compute_tess_gfx = compute_gfx + tess_control_gfx + tess_eval_gfx;
+
 alias nvapi = hlsl_nvapi;
 alias raytracing = GL_EXT_ray_tracing | _sm_6_5 | cuda;
 alias raytracing_pos = GL_EXT_ray_tracing + GL_EXT_ray_tracing_position_fetch | _sm_6_5 | cuda;
@@ -269,8 +279,12 @@ alias groupnonuniform = GL_KHR_shader_subgroup_ballot + GL_KHR_shader_subgroup_s
                           + GL_KHR_shader_subgroup_arithmetic + GL_KHR_shader_subgroup_quad + GL_KHR_shader_subgroup_vote
                         | _sm_6_0 | cuda;
 alias fragmentshaderbarycentric = GL_EXT_fragment_shader_barycentric | _sm_6_1;
-
-
+alias fragmentprocessing = fragment_gfx + glsl_spirv | fragment + _sm_5_0;
+alias fragmentprocessing_derivativecontrol = fragmentprocessing + GL_ARB_derivative_control;
+alias shadermemorycontrol = glsl | spirv_1_0 | _sm_5_0;
+alias shadermemorycontrol_compute = compute_gfx + shadermemorycontrol;
+alias subpass = fragment_gfx;
+alias shaderinvocationgroup = GL_KHR_shader_subgroup_vote + glsl | spirv_1_3 | _sm_6_0;
 // Define what each HLSL shader model means on different targets.
 
 
@@ -371,9 +385,6 @@ alias GLSL_440 = glsl + sm_6_0 | spirv_1_5 + sm_6_0;
 alias GLSL_450 = glsl + sm_6_3 | spirv_1_5 + sm_6_3;
 alias GLSL_460 = glsl_spirv_1_5 + all | spirv_1_5 + all;
 
-alias tess_control = hull;
-alias tess_eval = domain;
-
 alias DX_4_0 = sm_4_0;
 alias DX_4_1 = sm_4_1;
 alias DX_5_0 = sm_5_0;