fix: remove avx2 requirment for windows

Author: Julusian

CHANGELOG.md

@@ -1,13 +1,6 @@
 CasparCG 2.5.0 Stable
 ==========================================
 
-### Important
-
-We recommend running CasparCG 2.5 on CPUs which support AVX2. Officially Chrome claims to require AVX2, and it is required for some of our in-progress HDR support.
-Intel CPUs based on Haswell or later support this, which were first released to consumers in 2013, or 2014 for servers.
-
-Starting with CasparCG 2.6, this will become a requirement
-
 ### Core
 ##### Improvements
 * Initial support for HDR. This is limited to a subset of producers and consumers at this stage.

src/CMakeModules/Bootstrap_Windows.cmake

@@ -281,4 +281,4 @@ string(REPLACE "/EHsc" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHa /Zi /W4 /WX /MP /fp:fast /Zm192 /FIcommon/compiler/vs/disable_silly_warnings.h")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}	/D TBB_USE_ASSERT=1 /D TBB_USE_DEBUG /bigobj")
-set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}	/Oi /arch:AVX2 /Ot /Gy /bigobj")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}	/Oi /arch:AVX /Ot /Gy /bigobj")

src/modules/decklink/consumer/config.cpp

@@ -24,6 +24,12 @@
 #include <common/param.h>
 #include <common/ptree.h>
 
+#ifdef WIN32
+#include <isa_availability.h>
+
+#define CHECK_INSTRUCTION_SUPPORT(a, v) (__check_arch_support((a), (v)) || __check_isa_support((a), (v)))
+#endif
+
 namespace caspar { namespace decklink {
 
 port_configuration parse_output_config(const boost::property_tree::wptree&  ptree,
@@ -130,6 +136,14 @@ configuration parse_xml_config(const boost::property_tree::wptree&  ptree,
             CASPAR_THROW_EXCEPTION(user_error()
                                    << msg_info(L"The decklink consumer only supports rgba output on 8-bit channels"));
         }
+
+#ifdef WIN32
+        if (!CHECK_INSTRUCTION_SUPPORT(__IA_SUPPORT_VECTOR256, 0) &&
+            config.pixel_format != configuration::pixel_format_t::rgba) {
+            CASPAR_THROW_EXCEPTION(user_error()
+                                   << msg_info(L"You cpu does not support the features needed for yuv output"));
+        }
+#endif
     }
 
     config.primary = parse_output_config(ptree, format_repository);