UI:Button hover: highlight demo

corwinn · Jan 28, 2023 · c5e4f87 · c5e4f87
1 parent 8e3bd52
commit c5e4f87
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Showing 2 changed files with 22 additions and 5 deletions.
diff --git a/ui/h3r_button.cpp b/ui/h3r_button.cpp
@@ -74,9 +74,9 @@ Button::Button(const String & res_name, Control * base)
     glDisable (GL_MULTISAMPLE);
     glShadeModel (GL_FLAT);
 
-    glGenTextures (1, &_tex);
+    glGenTextures (2, _tex);
 
-    glBindTexture (GL_TEXTURE_2D, _tex);
+    glBindTexture (GL_TEXTURE_2D, _tex[0]);
     glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
@@ -89,6 +89,22 @@ Button::Button(const String & res_name, Control * base)
         btn_def_n->Height (),
         0, GL_RGBA, GL_UNSIGNED_BYTE, byte_arr_ptr->operator byte * ());
 
+    glBindTexture (GL_TEXTURE_2D, _tex[1]);
+    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
+    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+    n = res_name.ToLower ().Replace (".def", "h.pcx");
+    btn_def_n = btn_def.Query (n);
+    byte_arr_ptr = btn_def_n->RGBA ();
+    glTexImage2D (GL_TEXTURE_2D, 0, /*GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,*/
+        GL_RGBA,
+        btn_def_n->Width (), // TODO power of 2 UI atlas
+        btn_def_n->Height (),
+        0, GL_RGBA, GL_UNSIGNED_BYTE, byte_arr_ptr->operator byte * ());
+
     float fw = static_cast<float>(btn_def_n->Width ()),
         fh = static_cast<float>(btn_def_n->Height ());
     GLfloat v[16] {0,0,0,0, 0,fh,0,1, fw,0,1,0, fw,fh,1,1};
@@ -118,7 +134,8 @@ void Button::OnRender(GC &)
     glAlphaFunc (GL_GEQUAL, 1.0f);
     // glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 
-    glBindTexture (GL_TEXTURE_2D, _tex);
+    if (! _mouse_over) glBindTexture (GL_TEXTURE_2D, _tex[0]);
+    else glBindTexture (GL_TEXTURE_2D, _tex[1]);
     glBindBuffer (GL_ARRAY_BUFFER, _vbo);
 
     glTranslatef (Pos ().X, Pos ().Y, 0);

diff --git a/ui/h3r_button.h b/ui/h3r_button.h
@@ -47,12 +47,12 @@ H3R_NAMESPACE
 // Its size is stored at the resource it is created from.
 class Button: public Control
 {
-    private: GLuint _tex, _vbo;
+    private: GLuint _tex[2] {}, _vbo;
 
     public: Button(const String &, Control * = nullptr);
     public: virtual ~Button() override
     {
-        glDeleteBuffers (1, &_vbo), glDeleteTextures (1, &_tex);
+        glDeleteBuffers (1, &_vbo), glDeleteTextures (2, _tex);
     }
 
     public: virtual void OnRender(GC &) override;