# HG changeset patch
# User Sebastien Jodogne <s.jodogne@gmail.com>
# Date 1674842627 -3600
# Node ID a73a8415780fdbccf04712078436c1cd5f9e89a6
# Parent  4b24b7533346f75b12dd1cdb550faa6978f2b5f3
added OpenGLTexture::SetClampingToZero()

diff -r 4b24b7533346 -r a73a8415780f OrthancStone/Sources/OpenGL/OpenGLTexture.cpp
--- a/OrthancStone/Sources/OpenGL/OpenGLTexture.cpp	Fri Jan 27 15:43:24 2023 +0100
+++ b/OrthancStone/Sources/OpenGL/OpenGLTexture.cpp	Fri Jan 27 19:03:47 2023 +0100
@@ -211,5 +211,16 @@
 
       return target.release();
     }
+    
+
+    void OpenGLTexture::SetClampingToZero()
+    {
+      glBindTexture(GL_TEXTURE_2D, texture_);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+
+      GLfloat colorfv[4] = { 0, 0, 0, 0 };
+      glTextureParameterfv(texture_, GL_TEXTURE_BORDER_COLOR, colorfv);
+    }
   }
 }
diff -r 4b24b7533346 -r a73a8415780f OrthancStone/Sources/OpenGL/OpenGLTexture.h
--- a/OrthancStone/Sources/OpenGL/OpenGLTexture.h	Fri Jan 27 15:43:24 2023 +0100
+++ b/OrthancStone/Sources/OpenGL/OpenGLTexture.h	Fri Jan 27 19:03:47 2023 +0100
@@ -83,6 +83,12 @@
       void Bind(GLint location);
 
       Orthanc::ImageAccessor* Download(Orthanc::PixelFormat format);
+
+      /**
+       * By default, textures are mirrored at the borders. This
+       * function will set out-of-image access to zero.
+       **/
+      void SetClampingToZero();
     };
   }
 }