added font rendering

funnyassets/shaders/kottui.shader

@@ -0,0 +1,85 @@
+
+#include "macros.hlsl"
+COMMON {
+	struct PS_INPUT
+	{
+		float4 m_vPosition: SV_POSITION;
+		float2 m_vUV: TEXCOORD0;
+		uint m_uFont;
+	}
+	struct TextDrawData_t
+	{
+		float2 m_vTexcoordOffset;
+		float2 m_vTexcoordSize;
+
+		float2 m_vPos;
+		float2 m_vSize;
+		float4 m_vFGColor;
+		float4 m_vBGColor;
+	}
+
+	StructuredBuffer<TextDrawData_t> g_textData: register( t0 );
+	cbuffer ScreenData_t: register( b1 )
+	{
+		float2 g_vScreenSize;
+	}
+	Texture2D<float4> g_atlas: register( t2 );
+	SamplerState g_atlasSampler: register(s3);
+}
+VS
+{
+	struct VS_INPUT
+	{
+		float2 m_vPosition: POSITION;
+	}
+
+
+	PS_INPUT vsMain( VS_INPUT input, uint uInstance: SV_InstanceID, uint uBaseInstance: SV_StartInstanceLocation )
+	{
+		uint uInstance = uBaseInstance + uInstance;
+		float2 position = input.m_vPosition;
+		position*=g_textData[uInstance].m_vSize;
+		position+=g_textData[uInstance].m_vPos;
+		position/=g_vScreenSize;
+		position.y = 1-position.y;
+		position*=2;
+		position-=1;
+		float2 uv = input.m_vPosition;
+		uv.y = 1-uv.y;
+		uv*=g_textData[uInstance].m_vTexcoordSize;
+		uv+=g_textData[uInstance].m_vTexcoordOffset;
+		PS_INPUT output = {};
+		output.m_vPosition = float4(position, 0, 1);
+		output.m_vUV = uv;
+		return output;
+	}
+
+
+}
+PS
+{
+	struct PS_OUTPUT
+	{
+		float4 m_vAlbedo: SV_Target0;
+	}
+	
+	float ScreenPixelRange( float2 uv )
+	{
+		uint uWidth, uHeight;
+		g_atlas.GetDimensions(uWidth, uHeight);
+		float2 vUnitRange = 2.0/float2(uWidth, uHeight);
+		float2 vScreenTexSize = 1.0/fwidth(uv);
+		return max(0.5*dot(vUnitRange, vScreenTexSize), 1);
+	}
+
+	PS_OUTPUT psMain( PS_INPUT input )
+	{
+		PS_OUTPUT output = {};
+		float4 vMsd = g_atlas.Sample(g_atlasSampler, input.m_vUV.xy);
+		float fSd = median3(vMsd.x, vMsd.y, vMsd.z);
+		float fScreenPixelDistance = ScreenPixelRange(input.m_vUV)*(fSd-0.5);
+		float fOpacity = clamp(fScreenPixelDistance+0.5, 0.0, 1.0);
+		output.m_vAlbedo = fOpacity;
+		return output;
+	}
+}