Merge lp:~hikiko/compiz/compiz.opt-fix into lp:compiz/0.9.12

[Eleni Maria Stea]

Minor optimisation fix:
Replaced glLoadIdentity, glMultMatrixf with glLoadMatrixf to avoid the unnecessary matrix multiplication: identity * some projection matrix

Minor optimisation fix:
Replaced glLoadIdentity, glMultMatrixf with glLoadMatrixf to avoid the unnecessary matrix multiplication: identity * some projection matrix

[PS Jenkins bot (ps-jenkins)]

PASSED: Continuous integration, rev:3933
http://jenkins.qa.ubuntu.com/job/compiz-ci/34/
Executed test runs:
    SUCCESS: http://jenkins.qa.ubuntu.com/job/compiz-vivid-amd64-ci/24
    SUCCESS: http://jenkins.qa.ubuntu.com/job/compiz-vivid-armhf-ci/24
    SUCCESS: http://jenkins.qa.ubuntu.com/job/compiz-vivid-i386-ci/24

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review: Approve (continuous-integration)

[Stephen M. Webb (bregma)]

review: Approve

=== modified file 'plugins/opengl/src/screen.cpp'
--- plugins/opengl/src/screen.cpp	2015-02-26 18:58:45 +0000
+++ plugins/opengl/src/screen.cpp	2015-03-12 18:05:30 +0000
@@ -1735,8 +1735,7 @@
 
     #ifndef USE_GLES
     glMatrixMode (GL_PROJECTION);
-    glLoadIdentity ();
-    glMultMatrixf (projection_array);
+    glLoadMatrixf (projection_array);
     glMatrixMode (GL_MODELVIEW);
     #endif