ANGLE: Allow for universal program binaries

As a safety precaution, ANGLE writes the commit hash, optimization level,
and adapter ID to its binary format. However, this hurts portability
between systems by making shader pre-compilation/caching artificially
system-specific.

The shader compiler doesn't take the target adapter into account, and the
optimization level information discarded by ANGLE anyway. So, allow ANGLE
to bypass these checks on systems where precompilation is required (i.e.
WinRT). The default mechanism still applies unless
ANGLE_ENABLE_UNIVERSAL_BINARY is passed as a define.

Change-Id: Iec6d833fd7010ed163978557238f00e7ac6ae416
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/src/angle/patches/0013-ANGLE-Allow-for-universal-program-binaries.patch b/src/angle/patches/0013-ANGLE-Allow-for-universal-program-binaries.patch
new file mode 100644
index 0000000000..11c32880df
--- /dev/null
+++ b/src/angle/patches/0013-ANGLE-Allow-for-universal-program-binaries.patch
@@ -0,0 +1,93 @@
+From 5eeb4a06f182b4fc0e3dcb82f47fcf4286890f94 Mon Sep 17 00:00:00 2001
+From: Andrew Knight <andrew.knight@digia.com>
+Date: Fri, 21 Feb 2014 08:35:01 +0200
+Subject: [PATCH] ANGLE: Allow for universal program binaries
+
+As a safety precaution, ANGLE writes the commit hash, optimization level,
+and adapter ID to its binary format. However, this hurts portability
+between systems by making shader pre-compilation/caching artificially
+system-specific.
+
+The shader compiler doesn't take the target adapter into account, and the
+optimization level information discarded by ANGLE anyway. So, allow ANGLE
+to bypass these checks on systems where precompilation is required (i.e.
+WinRT). The default mechanism still applies unless
+ANGLE_ENABLE_UNIVERSAL_BINARY is passed as a define.
+
+Change-Id: Iec6d833fd7010ed163978557238f00e7ac6ae416
+---
+ src/3rdparty/angle/src/libGLESv2/ProgramBinary.cpp | 11 ++++++++++-
+ 1 file changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/src/3rdparty/angle/src/libGLESv2/ProgramBinary.cpp b/src/3rdparty/angle/src/libGLESv2/ProgramBinary.cpp
+index 8896665..41a83b6 100644
+--- a/src/3rdparty/angle/src/libGLESv2/ProgramBinary.cpp
++++ b/src/3rdparty/angle/src/libGLESv2/ProgramBinary.cpp
+@@ -1637,6 +1637,7 @@ bool ProgramBinary::load(InfoLog &infoLog, const void *binary, GLsizei length)
+         return false;
+     }
+ 
++#if !defined(ANGLE_ENABLE_UNIVERSAL_BINARY)
+     unsigned char commitString[ANGLE_COMMIT_HASH_SIZE];
+     stream.read(commitString, ANGLE_COMMIT_HASH_SIZE);
+     if (memcmp(commitString, ANGLE_COMMIT_HASH, sizeof(unsigned char) * ANGLE_COMMIT_HASH_SIZE) != 0)
+@@ -1652,6 +1653,7 @@ bool ProgramBinary::load(InfoLog &infoLog, const void *binary, GLsizei length)
+         infoLog.append("Mismatched compilation flags.");
+         return false;
+     }
++#endif
+ 
+     for (int i = 0; i < MAX_VERTEX_ATTRIBS; ++i)
+     {
+@@ -1742,6 +1744,7 @@ bool ProgramBinary::load(InfoLog &infoLog, const void *binary, GLsizei length)
+ 
+     const char *ptr = (const char*) binary + stream.offset();
+ 
++#if !defined(ANGLE_ENABLE_UNIVERSAL_BINARY)
+     const GUID *binaryIdentifier = (const GUID *) ptr;
+     ptr += sizeof(GUID);
+ 
+@@ -1751,6 +1754,7 @@ bool ProgramBinary::load(InfoLog &infoLog, const void *binary, GLsizei length)
+         infoLog.append("Invalid program binary.");
+         return false;
+     }
++#endif
+ 
+     const char *pixelShaderFunction = ptr;
+     ptr += pixelShaderSize;
+@@ -1808,9 +1812,10 @@ bool ProgramBinary::save(void* binary, GLsizei bufSize, GLsizei *length)
+     stream.write(GL_PROGRAM_BINARY_ANGLE);
+     stream.write(ANGLE_MAJOR_VERSION);
+     stream.write(ANGLE_MINOR_VERSION);
++#if !defined(ANGLE_ENABLE_UNIVERSAL_BINARY)
+     stream.write(ANGLE_COMMIT_HASH, ANGLE_COMMIT_HASH_SIZE);
+     stream.write(ANGLE_COMPILE_OPTIMIZATION_LEVEL);
+-
++#endif
+     for (unsigned int i = 0; i < MAX_VERTEX_ATTRIBS; ++i)
+     {
+         stream.write(mLinkedAttribute[i].type);
+@@ -1866,7 +1871,9 @@ bool ProgramBinary::save(void* binary, GLsizei bufSize, GLsizei *length)
+     UINT geometryShaderSize = (mGeometryExecutable != NULL) ? mGeometryExecutable->getLength() : 0;
+     stream.write(geometryShaderSize);
+ 
++#if !defined(ANGLE_ENABLE_UNIVERSAL_BINARY)
+     GUID identifier = mRenderer->getAdapterIdentifier();
++#endif
+ 
+     GLsizei streamLength = stream.length();
+     const void *streamData = stream.data();
+@@ -1889,8 +1896,10 @@ bool ProgramBinary::save(void* binary, GLsizei bufSize, GLsizei *length)
+         memcpy(ptr, streamData, streamLength);
+         ptr += streamLength;
+ 
++#if !defined(ANGLE_ENABLE_UNIVERSAL_BINARY)
+         memcpy(ptr, &identifier, sizeof(GUID));
+         ptr += sizeof(GUID);
++#endif
+ 
+         memcpy(ptr, mPixelExecutable->getFunction(), pixelShaderSize);
+         ptr += pixelShaderSize;
+-- 
+1.8.4.msysgit.0
+