fix color bleeding

src/shader.h

@@ -7,7 +7,6 @@ enum class kShaderUniform : uint16_t
 {
     MVP = const_hash("mvp"),
     Tex = const_hash("tex"),
-    TexA = const_hash("tex_alpha"),
     TexFG = const_hash("tex_fg"),
     TexBG = const_hash("tex_bg"),
     TexMix = const_hash("tex_mix"),
@@ -60,7 +59,6 @@ enum class kShader : uint16_t
     TextureMask = const_hash("texture-mask"),
     TextureColorize = const_hash("texture-colorize"),
     TextureAlpha= const_hash("texture-alpha"),
-    TextureAlphaSep= const_hash("texture-alpha-sep"),
     TextureBlend= const_hash("texture-blend"),
     CompErase   = const_hash("comp-erase"),
     CompDraw    = const_hash("comp-draw"),
@@ -69,6 +67,8 @@ enum class kShader : uint16_t
     Font        = const_hash("font"),
     Atlas       = const_hash("atlas"),
     Stroke      = const_hash("stroke"),
+    StrokePad   = const_hash("stroke-pad"),
+    StrokeDilate= const_hash("stroke-dilate"),
     StrokePreview = const_hash("stroke-preview"),
     Checkerboard= const_hash("checkerboard"),
     Equirect    = const_hash("equirect"),