opengl: shader based polyline rendering - fixes tdf#97137 for OGL

Adds native opengl polyline rendering to draw polylines, line joins
and line caps as triangle strips. The vertex shader allows for the
dynamic line width by calculating the correct vertex posiitons,
and the fragment shader is used for anti-aliasing.

Change-Id: If7982c828cae1fae59c57194c8ac77e5ad7f1d26

1 files changed, 3 insertions, 1 deletions

diff --git a/vcl/inc/opengl/program.hxx b/vcl/inc/opengl/program.hxx
index 5de3c1bdbe5f..780cba72380f 100644
--- a/vcl/inc/opengl/program.hxx
+++ b/vcl/inc/opengl/program.hxx
@@ -37,6 +37,7 @@ private:
     GLuint          mnTexCoordAttrib;
     GLuint          mnAlphaCoordAttrib;
     GLuint          mnMaskCoordAttrib;
+    GLuint          mnNormalAttrib;
     TextureList     maTextures;
     bool            mbBlending;
 
@@ -59,6 +60,7 @@ public:
     void SetTextureCoord( const GLvoid* pData );
     void SetAlphaCoord( const GLvoid* pData );
     void SetMaskCoord(const GLvoid* pData);
+    void SetExtrusionVectors(const GLvoid* pData);
 
     void SetUniform1f( const OString& rName, GLfloat v1 );
     void SetUniform2f( const OString& rName, GLfloat v1, GLfloat v2 );
@@ -80,7 +82,7 @@ public:
     bool DrawTexture( const OpenGLTexture& rTexture );
 
 protected:
-    void SetVertexAttrib( GLuint& rAttrib, const OString& rName, const GLvoid* pData );
+    void SetVertexAttrib( GLuint& rAttrib, const OString& rName, const GLvoid* pData, GLint nSize = 2 );
     GLuint GetUniformLocation( const OString& rName );
 };