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, 4 insertions, 1 deletions

diff --git a/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.h b/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.h
index bc895d750..6b12f6871 100644
--- a/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.h
+++ b/tools/emulator/opengl/shared/OpenglCodecCommon/GLClientState.h
@@ -120,6 +120,9 @@ public:
     }
     size_t pixelDataSize(GLsizei width, GLsizei height, GLenum format, GLenum type, int pack) const;
 
+    void setCurrentProgram(GLint program) { m_currentProgram = program; }
+    GLint currentProgram() const { return m_currentProgram; }
+
 private:
     PixelStoreState m_pixelStore;
     VertexAttribState *m_states;
@@ -127,7 +130,7 @@ private:
     GLuint m_currentArrayVbo;
     GLuint m_currentIndexVbo;
     int m_activeTexture;
-
+    GLint m_currentProgram;
 
     bool validLocation(int location) { return (location >= 0 && location < m_nLocations); }
 public: