added ui rendering

funnyassets/gfx_shaders/fgui_text_shared.slang

@@ -3,6 +3,7 @@
 struct VertexOutput
 {
 	float4 position: SV_Position;
+	float2 uv: TEXCOORD0;
 }
 #include "shader_base.h"
 
@@ -11,8 +12,11 @@ DECLARE_CONSTANTS()
 	int2 resolution;
 	uint2 size;
 	int2 position;
-	int8_t character;
+	float4 color;
+	float2 glyphPos;
+	float2 glyphSize;
+	uint font;
 };
 
-DECLARE_TEXTURES(0);
+DECLARE_TEXTURES(29);