vcl OpenGL program: Cache mvp matrix to reduce ~200 api calls per frame.

(cherry picked from commit e3cd97ce0b2e153b8b6812cc66f2e7d33504a7da)

Conflicts:
vcl/opengl/program.cxx

Change-Id: I86ae50bd8d2148e86a6c8fc0821d3e2bc29a0cd4

2 files changed, 17 insertions, 1 deletions

diff --git a/vcl/inc/opengl/program.hxx b/vcl/inc/opengl/program.hxx
index 7ac1936e1936..8289a56de4bf 100644
--- a/vcl/inc/opengl/program.hxx
+++ b/vcl/inc/opengl/program.hxx
@@ -40,6 +40,11 @@ private:
     TextureList     maTextures;
     bool            mbBlending;
 
+    float mfLastWidth;
+    float mfLastHeight;
+    float mfLastPixelOffset;
+
+
     OpenGLProgram(const OpenGLProgram &) SAL_DELETED_FUNCTION;
 public:
     OpenGLProgram();
diff --git a/vcl/opengl/program.cxx b/vcl/opengl/program.cxx
index ede054816d5f..b1d3cfe8291d 100644
--- a/vcl/opengl/program.cxx
+++ b/vcl/opengl/program.cxx
@@ -22,7 +22,10 @@ OpenGLProgram::OpenGLProgram() :
     mnTexCoordAttrib( SAL_MAX_UINT32 ),
     mnAlphaCoordAttrib( SAL_MAX_UINT32 ),
     mnMaskCoordAttrib( SAL_MAX_UINT32 ),
-    mbBlending( false )
+    mbBlending( false ),
+    mfLastWidth(0.0),
+    mfLastHeight(0.0),
+    mfLastPixelOffset(0.0)
 {
 }
 
@@ -247,6 +250,14 @@ void OpenGLProgram::SetTransform(
 
 void OpenGLProgram::ApplyMatrix(float fWidth, float fHeight, float fPixelOffset)
 {
+
+    if (mfLastWidth == fWidth && mfLastHeight == fHeight && mfLastPixelOffset == fPixelOffset)
+        return;
+
+    mfLastWidth = fWidth;
+    mfLastHeight = fHeight;
+    mfLastPixelOffset = fPixelOffset;
+
     OString sProjectionMatrix("mvp");
     GLuint nUniform = GetUniformLocation(sProjectionMatrix);