Added context state copying to sharing test.

tests/sharing.c

@@ -92,8 +92,6 @@ static void draw_quad(GLuint texture)
     glBindTexture(GL_TEXTURE_2D, texture);
     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 
-    glColor3f(0.6f, 0.f, 0.6f);
-
     glBegin(GL_QUADS);
 
     glTexCoord2f(0.f, 0.f);
@@ -142,6 +140,11 @@ int main(int argc, char** argv)
         exit(EXIT_FAILURE);
     }
 
+    // Set drawing color for the first context and copy it to the second
+    glfwMakeContextCurrent(windows[0]);
+    glColor3f(0.6f, 0.f, 0.6f);
+    glfwCopyContext(windows[0], windows[1], GL_CURRENT_BIT);
+
     // Put the second window to the right of the first one
     glfwGetWindowPos(windows[0], &x, &y);
     glfwSetWindowPos(windows[1], x + WIDTH + 50, y);