opengles emulator: Workaround Cordy (Unity) bug with intel driver.

Uniform locations are 32-bit values which the application queries
from the driver after a shader program is linked. It seems that Cordy
game (possibly all Unity based apps) store the returned location as
16-bit value. Intel driver returns location values in the upper 16-bit
range :(
This is a workaround for this issue, when a program is linked we check
the locations of all uniforms, if all locations are within the upper
16-bit range (as with Intel driver) we shift the location value before
returning to the application. Also override all functions which take
a location parameter and do the reverse shift before sending a location
value to the host.

Change-Id: I234aaafe3313774b5da79eb1dac713b89b10ad60

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.cpp b/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.cpp
index dcfe9feed..f8820d23f 100644
--- a/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.cpp
+++ b/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.cpp
@@ -50,6 +50,7 @@ GLClientState::GLClientState(int nLocations)
     m_states[MATRIXINDEX_LOCATION].glConst = GL_MATRIX_INDEX_ARRAY_OES;
     m_states[WEIGHT_LOCATION].glConst = GL_WEIGHT_ARRAY_OES;
     m_activeTexture = 0;
+    m_currentProgram = 0;
 
     m_pixelStore.unpack_alignment = 4;
     m_pixelStore.pack_alignment = 4;