opacity helper

diff --git a/submodules/SDL_GameControllerDB b/submodules/SDL_GameControllerDB
index c5b4df0e1061175cb11e3ebbf8045178339864a5..6ed8d054340ee8a93a684e11360b66cd8a5c168e 160000 (submodule)
--- a/submodules/SDL_GameControllerDB
+++ b/submodules/SDL_GameControllerDB
@@ -1 +1 @@
-Subproject commit c5b4df0e1061175cb11e3ebbf8045178339864a5
+Subproject commit 6ed8d054340ee8a93a684e11360b66cd8a5c168e

diff --git a/submodules/anyascii b/submodules/anyascii
index eb5332d0b5e48d58397e6f27475a18e058330d23..44e971c774d9ec67ca6c1f16c5a476724821ab63 160000 (submodule)
--- a/submodules/anyascii
+++ b/submodules/anyascii
@@ -1 +1 @@
-Subproject commit eb5332d0b5e48d58397e6f27475a18e058330d23
+Subproject commit 44e971c774d9ec67ca6c1f16c5a476724821ab63

diff --git a/submodules/qoi b/submodules/qoi
index dfc056e813c98d307238d35f7f041a725d699dfc..b8d77df1e80b652a57f0b7270449b179a6b91f40 160000 (submodule)
--- a/submodules/qoi
+++ b/submodules/qoi
@@ -1 +1 @@
-Subproject commit dfc056e813c98d307238d35f7f041a725d699dfc
+Subproject commit b8d77df1e80b652a57f0b7270449b179a6b91f40

diff --git a/submodules/stb b/submodules/stb
index 5736b15f7ea0ffb08dd38af21067c314d6a3aae9..8b5f1f37b5b75829fc72d38e7b5d4bcbf8a26d55 160000 (submodule)
--- a/submodules/stb
+++ b/submodules/stb
@@ -1 +1 @@
-Subproject commit 5736b15f7ea0ffb08dd38af21067c314d6a3aae9
+Subproject commit 8b5f1f37b5b75829fc72d38e7b5d4bcbf8a26d55

diff --git a/vg_imgui.h b/vg_imgui.h
index 4433b2a2d9b650d7cdd576618297d7bd0baa37f5..0a83a53f714e6fe6e59bac27fe03eedfa2582e7d 100644 (file)
--- a/vg_imgui.h
+++ b/vg_imgui.h
@@ -850,6 +850,11 @@ static void ui_text_glyph( const struct ui_font *font, ui_px scale,
    out_texcoords[3] = out_texcoords[1] + font->glyph_height;
 }
 
+static u32 ui_opacity( u32 colour, f32 opacity ){
+   u32 alpha = opacity * 255.0f;
+   return (colour & 0x00ffffff) | (alpha << 24);
+}
+
 static u32 ui_ntext( ui_rect rect, const char *str, u32 len, ui_px scale, 
                      enum ui_align align, u32 colour ){
        ui_rect text_cursor;