Hello, I am using Unity 2020.1.0f1 and I need to get precise height data in fragment shader on Android.
This is necessary in order to draw beautiful elevation lines.
My shader (I’ve just simply modify and copy URP graph shader):
Shader "Unlit Master"
{
Properties
{
[NoScaleOffset]SurfaceHeightfield("SurfaceHeightfield", 2D) = "black" {}
}
SubShader
{
Tags
{
"RenderPipeline"="UniversalPipeline"
"RenderType"="Opaque"
"Queue"="Geometry+0"
}
Pass
{
Name "Pass"
Tags
{
// LightMode: <None>
}
// Render State
Blend One Zero, One Zero
Cull Back
ZTest LEqual
ZWrite On
// ColorMask: <None>
HLSLPROGRAM
#pragma vertex vert
#pragma fragment frag
// Pragmas
#pragma prefer_hlslcc gles
#pragma exclude_renderers d3d11_9x
#pragma target 3.5
#pragma multi_compile_fog
#pragma multi_compile_instancing
// Keywords
#pragma multi_compile _ LIGHTMAP_ON
#pragma multi_compile _ DIRLIGHTMAP_COMBINED
#pragma shader_feature _ _SAMPLE_GI
// GraphKeywords: <None>
// Defines
#define ATTRIBUTES_NEED_NORMAL
#define ATTRIBUTES_NEED_TANGENT
#define ATTRIBUTES_NEED_TEXCOORD0
#define VARYINGS_NEED_TEXCOORD0
#pragma multi_compile_instancing
#define SHADERPASS_UNLIT
#define PREFER_HALF 0
#define SHADER_HINT_NICE_QUALITY 1
// Includes
...
// --------------------------------------------------
// Graph
// Graph Properties
CBUFFER_START(UnityPerMaterial)
CBUFFER_END
TEXTURE2D_FLOAT(SurfaceHeightfield);
SAMPLER(samplerSurfaceHeightfield);
float4 SurfaceHeightfield_TexelSize;
SAMPLER(SamplerState_Linear_Clamp);
// Graph Vertex
// GraphVertex: <None>
// Graph Pixel
struct SurfaceDescriptionInputs
{
float4 uv0;
};
struct SurfaceDescription
{
float3 Color;
float Alpha;
float AlphaClipThreshold;
};
SurfaceDescription SurfaceDescriptionFunction(SurfaceDescriptionInputs IN)
{
SurfaceDescription surface = (SurfaceDescription)0;
surface.Color =
SurfaceHeightfield.Sample(SamplerState_Linear_Clamp, IN.uv0);
surface.Alpha = 1;
surface.AlphaClipThreshold = 0;
return surface;
}
...
ENDHLSL
}
...
}
}
I have added line 57 and 58 by myself:
#define PREFER_HALF 0
#define SHADER_HINT_NICE_QUALITY 1
After I press “compile and show code” and see this in glsl:
...
#ifdef VERTEX
#version 300 es
...
in highp vec3 in_POSITION0;
in highp vec4 in_TEXCOORD0;
out highp vec4 vs_TEXCOORD0;
vec4 u_xlat0;
vec4 u_xlat1;
void main()
{
u_xlat0.xyz = in_POSITION0.yyy * hlslcc_mtx4x4unity_ObjectToWorld[1].xyz;
u_xlat0.xyz = hlslcc_mtx4x4unity_ObjectToWorld[0].xyz * in_POSITION0.xxx + u_xlat0.xyz;
u_xlat0.xyz = hlslcc_mtx4x4unity_ObjectToWorld[2].xyz * in_POSITION0.zzz + u_xlat0.xyz;
u_xlat0.xyz = u_xlat0.xyz + hlslcc_mtx4x4unity_ObjectToWorld[3].xyz;
u_xlat1 = u_xlat0.yyyy * hlslcc_mtx4x4unity_MatrixVP[1];
u_xlat1 = hlslcc_mtx4x4unity_MatrixVP[0] * u_xlat0.xxxx + u_xlat1;
u_xlat0 = hlslcc_mtx4x4unity_MatrixVP[2] * u_xlat0.zzzz + u_xlat1;
gl_Position = u_xlat0 + hlslcc_mtx4x4unity_MatrixVP[3];
vs_TEXCOORD0 = in_TEXCOORD0;
return;
}
#endif
#ifdef FRAGMENT
#version 300 es
precision highp float;
precision highp int;
...
UNITY_LOCATION(0) uniform highp sampler2D SurfaceHeightfield;
in highp vec4 vs_TEXCOORD0;
layout(location = 0) out highp vec4 SV_TARGET0;
mediump vec3 u_xlat10_0;
void main()
{
u_xlat10_0.xyz = texture(SurfaceHeightfield, vs_TEXCOORD0.xy).xyz;
SV_TARGET0.xyz = u_xlat10_0.xyz;
SV_TARGET0.w = 1.0;
return;
}
#endif
The problem is in line 41 :
mediump vec3 u_xlat10_0;
I need highp here. How can i archive that?
