commit 312dcfb070a7274066d3e85e10970f57b1e3af6e
author John Kessenich <cepheus@frii.com> Tue Jul 03 13:19:51 2018 -0600
committer John Kessenich <cepheus@frii.com> Tue Jul 03 13:51:31 2018 -0600
tree 6dab5e3378b07780d7d23d61864457bd785b8c1f
parent eefab240f7fc1fb6ab887cea60142bda500fc813

Implement GL_EXT_shader_16bit_storage and GL_EXT_shader_8bit_storage extensions.

These introduce limited support for 8/16-bit types such that they can only be accessed in buffer memory and converted to/from 32-bit types.

Contributed from Khronos-internal work.

SPIRV/GLSL.ext.KHR.h

diff --git a/SPIRV/GLSL.ext.KHR.h b/SPIRV/GLSL.ext.KHR.h
old mode 100644
new mode 100755
index d8ea9b6..ec0c06d
--- a/SPIRV/GLSL.ext.KHR.h
+++ b/SPIRV/GLSL.ext.KHR.h
@@ -36,6 +36,7 @@
 static const char* const E_SPV_KHR_multiview                    = "SPV_KHR_multiview";
 static const char* const E_SPV_KHR_shader_draw_parameters       = "SPV_KHR_shader_draw_parameters";
 static const char* const E_SPV_KHR_16bit_storage                = "SPV_KHR_16bit_storage";
+static const char* const E_SPV_KHR_8bit_storage                 = "SPV_KHR_8bit_storage";
 static const char* const E_SPV_KHR_storage_buffer_storage_class = "SPV_KHR_storage_buffer_storage_class";
 static const char* const E_SPV_KHR_post_depth_coverage          = "SPV_KHR_post_depth_coverage";
 

SPIRV/GlslangToSpv.cpp

diff --git a/SPIRV/GlslangToSpv.cpp b/SPIRV/GlslangToSpv.cpp
index ec1b530..d5fb1ac 100755
--- a/SPIRV/GlslangToSpv.cpp
+++ b/SPIRV/GlslangToSpv.cpp
@@ -2507,6 +2507,20 @@
         }
     }
 
+    const bool contains8BitType = node->getType().containsBasicType(glslang::EbtInt8)   ||
+                                  node->getType().containsBasicType(glslang::EbtUint8);
+    if (contains8BitType) {
+        if (storageClass == spv::StorageClassPushConstant) {
+            builder.addExtension(spv::E_SPV_KHR_8bit_storage);
+            builder.addCapability(spv::CapabilityStoragePushConstant8);
+        } else if (storageClass == spv::StorageClassUniform) {
+            builder.addExtension(spv::E_SPV_KHR_8bit_storage);
+            builder.addCapability(spv::CapabilityUniformAndStorageBuffer8BitAccess);
+            if (node->getType().getQualifier().storage == glslang::EvqBuffer)
+                builder.addCapability(spv::CapabilityStorageBuffer8BitAccess);
+        }
+    }
+
     const char* name = node->getName().c_str();
     if (glslang::IsAnonymous(name))
         name = "";

SPIRV/doc.cpp

diff --git a/SPIRV/doc.cpp b/SPIRV/doc.cpp
index a905968..ae32efe 100755
--- a/SPIRV/doc.cpp
+++ b/SPIRV/doc.cpp
@@ -790,6 +790,10 @@
     case CapabilityStoragePushConstant16:       return "StoragePushConstant16";
     case CapabilityStorageInputOutput16:        return "StorageInputOutput16";
 
+    case CapabilityStorageBuffer8BitAccess:             return "CapabilityStorageBuffer8BitAccess";
+    case CapabilityUniformAndStorageBuffer8BitAccess:   return "CapabilityUniformAndStorageBuffer8BitAccess";
+    case CapabilityStoragePushConstant8:                return "CapabilityStoragePushConstant8";
+
     case CapabilityDeviceGroup: return "DeviceGroup";
     case CapabilityMultiView:   return "MultiView";
 

SPIRV/spirv.hpp

diff --git a/SPIRV/spirv.hpp b/SPIRV/spirv.hpp
old mode 100644
new mode 100755
index e21762d..f16c296
--- a/SPIRV/spirv.hpp
+++ b/SPIRV/spirv.hpp
@@ -679,6 +679,9 @@
     CapabilityVariablePointers = 4442,
     CapabilityAtomicStorageOps = 4445,
     CapabilitySampleMaskPostDepthCoverage = 4447,
+    CapabilityStorageBuffer8BitAccess = 4448,
+    CapabilityUniformAndStorageBuffer8BitAccess = 4449,
+    CapabilityStoragePushConstant8 = 4450,
     CapabilityFloat16ImageAMD = 5008,
     CapabilityImageGatherBiasLodAMD = 5009,
     CapabilityFragmentMaskAMD = 5010,