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我想構建一個多邊形工具WebGL項目。該項目在編輯器工作正常，但着色器給人建設時，即語法錯誤：着色器語法錯誤 - Unity WebGL
Shader error in 'Unlit/polygon': 'Value' : syntax error syntax error at line 28 (on gles)
Compiling Vertex program
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA
符合「28」的存在：
int PointNum =0;
我比較沒有經驗與OpenGL和首次置業計劃，但是我一直在研究Unity Shader手冊和ShaderLab資源，考慮可能會出現什麼問題 - 不幸的是沒有成功。您可以在翻譯後的評論中找到下面的着色器代碼（source link）。
我在想也許我沒有正確分配值？請讓我知道，如果你發現錯誤！任何幫助或想法嘗試非常感謝:)請讓我知道，如果你需要任何其他文件/信息！
「Polygon.shader」 文件：
Shader "Unlit/polygon"
{
Properties
{
//Define basic properties can be set from inside the editor variable
// _MainTex ("Texture", 2D) = "white" {}
}
CGINCLUDE
// Upgrade NOTE: excluded shader from DX11 because it uses wrong array syntax (type[size] name)
#pragma exclude_renderers d3d11
//Incoming vertices function from the application data structure definitions
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
//Incoming segment from a vertex function from the data structure definitions
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
//Define mapping variables
sampler2D _MainTex;
// float4 _MainTex_ST;
//Define variables for communicating with the script
vector Value[6];
int PointNum = 0;
//Function that calculates the distance between two points
float Dis(float4 v1,float4 v2)
{
return sqrt(pow((v1.x-v2.x),2)+pow((v1.y-v2.y),2));
}
//Draw line segments
bool DrawLineSegment(float4 p1, float4 p2, float lineWidth,v2f i)
{
float4 center = float4((p1.x+p2.x)/2,(p1.y+p2.y)/2,0,0);
//Calculate distance between point and line
float d = abs((p2.y-p1.y)*i.vertex.x + (p1.x - p2.x)*i.vertex.y +p2.x*p1.y -p2.y*p1.x)/sqrt(pow(p2.y-p1.y,2) + pow(p1.x-p2.x,2));
//When less than or equal to half the line width, which belongs to the linear range, return true
float lineLength = sqrt(pow(p1.x-p2.x,2)+pow(p1.y-p2.y,2));
if(d<=lineWidth/2 && Dis(i.vertex,center)<lineLength/2)
{
return true;
}
return false;
}
//To draw a polygon, this limits the number of vertices is not more than 6. You can change.
bool pnpoly(int nvert, float4 vert[6], float testx, float testy)
{
int i, j;
bool c=false;
float vertx[6];
float verty[6];
for(int n=0;n<nvert;n++)
{
vertx[n] = vert[n].x;
verty[n] = vert[n].y;
}
for (i = 0, j = nvert-1; i < nvert; j = i++) {
if (((verty[i]>testy) != (verty[j]>testy)) && (testx < (vertx[j]-vertx[i]) * (testy-verty[i])/(verty[j]-verty[i]) + vertx[i]))
c = !c;
}
return c;
}
v2f vert (appdata v)
{
v2f o;
//Object vertices from model space to the camera cut space, or you can use the shorthand way:
//o.vertex = UnityObjectToClipPos(v.vertex);
o.vertex = mul(UNITY_MATRIX_MVP,v.vertex);
//2D UV coordinate transformation can also use shorthand methods
//o.uv = TRANSFORM_TEX(v.uv, _MainTex);
//o.uv = v.uv.xy * _MainTex_ST.xy + _MainTex_ST.zw;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
//Draw a polygon vertex
for(int j=0;j<PointNum;j++)
{
if(Dis(i.vertex, Value[j])<3)
{
return fixed4(1,0,0,0.5);
}
}
//Draws the edges of the polygon
for(int k=0;k<PointNum;k++)
{
if(k==PointNum-1)
{
if(DrawLineSegment(Value[k],Value[0],2,i))
{
return fixed4(1,1,0,0.5);
}
}
else
{
if(DrawLineSegment(Value[k],Value[k+1],2,i))
{
return fixed4(1,1,0,0.5);
}
}
}
//Within the filled polygon
if(pnpoly(PointNum, Value,i.vertex.x ,i.vertex.y))
{
return fixed4(0,1,0,0.3);
}
return fixed4(0,0,0,0);
//fixed4 col = tex2D(_MainTex, i.uv);
//return col;
}
ENDCG
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
//Select Alpha blend mode
Blend SrcAlpha OneMinusSrcAlpha
//In the CGPROGRAM block of code to write your own processes
CGPROGRAM
//Defined segment function entry and vertex function respectively, Vert and Frag
#pragma vertex vert
#pragma fragment frag
//Contains the basic files, there are some macro definitions and basic functions
#include "UnityCG.cginc"
ENDCG
}
}
}
「編譯後熄滅，polygon.shader」 文件：
// Compiled shader for WebGL
//////////////////////////////////////////////////////////////////////////
//
// NOTE: This is *not* a valid shader file, the contents are provided just
// for information and for debugging purposes only.
//
//////////////////////////////////////////////////////////////////////////
// Skipping shader variants that would not be included into build of current scene.
Shader "Unlit/polygon" {
SubShader {
LOD 100
Tags { "RenderType"="Opaque" }
Pass {
Tags { "RenderType"="Opaque" }
Blend SrcAlpha OneMinusSrcAlpha
//////////////////////////////////
// //
// Compiled programs //
// //
//////////////////////////////////
//////////////////////////////////////////////////////
No keywords set in this variant.
-- Vertex shader for "gles":
// Compile errors generating this shader.
-- Fragment shader for "gles":
Shader Disassembly:
// All GLSL source is contained within the vertex program
-- Vertex shader for "gles3":
Shader Disassembly:
#ifdef VERTEX
#version 300 es
uniform vec4 hlslcc_mtx4x4glstate_matrix_mvp[4];
in highp vec4 in_POSITION0;
vec4 u_xlat0;
void main()
{
u_xlat0 = in_POSITION0.yyyy * hlslcc_mtx4x4glstate_matrix_mvp[1];
u_xlat0 = hlslcc_mtx4x4glstate_matrix_mvp[0] * in_POSITION0.xxxx + u_xlat0;
u_xlat0 = hlslcc_mtx4x4glstate_matrix_mvp[2] * in_POSITION0.zzzz + u_xlat0;
gl_Position = hlslcc_mtx4x4glstate_matrix_mvp[3] * in_POSITION0.wwww + u_xlat0;
return;
}
#endif
#ifdef FRAGMENT
#version 300 es
precision highp int;
uniform vec4 Value[6];
uniform int PointNum;
layout(location = 0) out lowp vec4 SV_Target0;
int u_xlati0;
vec2 u_xlat1;
ivec2 u_xlati1;
bool u_xlatb1;
float u_xlat2;
vec2 u_xlat3;
int u_xlati3;
bool u_xlatb3;
vec2 u_xlat4;
float u_xlat5;
vec2 u_xlat6;
int u_xlati6;
bool u_xlatb6;
vec2 u_xlat7;
float u_xlat9;
int u_xlati9;
bool u_xlatb9;
float u_xlat10;
int u_xlati10;
vec4 TempArray0[6];
vec4 TempArray1[6];
void main()
{
for(int u_xlati_loop_1 = 0 ; u_xlati_loop_1<PointNum ; u_xlati_loop_1++)
{
u_xlat3.xy = gl_FragCoord.xy + (-Value[u_xlati_loop_1].xy);
u_xlat3.xy = u_xlat3.xy * u_xlat3.xy;
u_xlat3.x = u_xlat3.y + u_xlat3.x;
u_xlat3.x = sqrt(u_xlat3.x);
#ifdef UNITY_ADRENO_ES3
u_xlatb3 = !!(u_xlat3.x<3.0);
#else
u_xlatb3 = u_xlat3.x<3.0;
#endif
if(u_xlatb3){
SV_Target0 = vec4(1.0, 0.0, 0.0, 0.5);
return;
//ENDIF
}
}
u_xlati0 = PointNum + int(0xFFFFFFFFu);
for(int u_xlati_loop_2 = 0 ; u_xlati_loop_2<PointNum ; u_xlati_loop_2++)
{
#ifdef UNITY_ADRENO_ES3
u_xlatb6 = !!(u_xlati0==u_xlati_loop_2);
#else
u_xlatb6 = u_xlati0==u_xlati_loop_2;
#endif
if(u_xlatb6){
u_xlat6.xy = Value[0].xy + Value[u_xlati_loop_2].xy;
u_xlat1.x = (-Value[u_xlati_loop_2].y) + Value[0].y;
u_xlat4.xy = (-Value[0].xy) + Value[u_xlati_loop_2].xy;
u_xlat10 = u_xlat4.x * gl_FragCoord.y;
u_xlat10 = u_xlat1.x * gl_FragCoord.x + u_xlat10;
u_xlat10 = Value[0].x * Value[u_xlati_loop_2].y + u_xlat10;
u_xlat10 = (-Value[0].y) * Value[u_xlati_loop_2].x + u_xlat10;
u_xlat4.xy = u_xlat4.xy * u_xlat4.xy;
u_xlat1.x = u_xlat1.x * u_xlat1.x + u_xlat4.x;
u_xlat1.x = sqrt(u_xlat1.x);
u_xlat1.x = abs(u_xlat10)/u_xlat1.x;
u_xlat4.x = u_xlat4.y + u_xlat4.x;
u_xlat4.x = sqrt(u_xlat4.x);
#ifdef UNITY_ADRENO_ES3
u_xlatb1 = !!(1.0>=u_xlat1.x);
#else
u_xlatb1 = 1.0>=u_xlat1.x;
#endif
u_xlat6.xy = (-u_xlat6.xy) * vec2(0.5, 0.5) + gl_FragCoord.xy;
u_xlat6.xy = u_xlat6.xy * u_xlat6.xy;
u_xlat6.x = u_xlat6.y + u_xlat6.x;
u_xlat6.x = sqrt(u_xlat6.x);
u_xlat9 = u_xlat4.x * 0.5;
#ifdef UNITY_ADRENO_ES3
u_xlatb6 = !!(u_xlat6.x<u_xlat9);
#else
u_xlatb6 = u_xlat6.x<u_xlat9;
#endif
u_xlatb6 = u_xlatb6 && u_xlatb1;
if(u_xlatb6){
SV_Target0 = vec4(1.0, 1.0, 0.0, 0.5);
return;
//ENDIF
}
} else {
u_xlati6 = u_xlati_loop_2 + 1;
u_xlat1.xy = Value[u_xlati6].xy + Value[u_xlati_loop_2].xy;
u_xlat9 = (-Value[u_xlati_loop_2].y) + Value[u_xlati6].y;
u_xlat7.xy = (-Value[u_xlati6].xy) + Value[u_xlati_loop_2].xy;
u_xlat2 = u_xlat7.x * gl_FragCoord.y;
u_xlat2 = u_xlat9 * gl_FragCoord.x + u_xlat2;
u_xlat2 = Value[u_xlati6].x * Value[u_xlati_loop_2].y + u_xlat2;
u_xlat6.x = (-Value[u_xlati6].y) * Value[u_xlati_loop_2].x + u_xlat2;
u_xlat7.xy = u_xlat7.xy * u_xlat7.xy;
u_xlat9 = u_xlat9 * u_xlat9 + u_xlat7.x;
u_xlat9 = sqrt(u_xlat9);
u_xlat6.x = abs(u_xlat6.x)/u_xlat9;
u_xlat9 = u_xlat7.y + u_xlat7.x;
u_xlat9 = sqrt(u_xlat9);
#ifdef UNITY_ADRENO_ES3
u_xlatb6 = !!(1.0>=u_xlat6.x);
#else
u_xlatb6 = 1.0>=u_xlat6.x;
#endif
u_xlat1.xy = (-u_xlat1.xy) * vec2(0.5, 0.5) + gl_FragCoord.xy;
u_xlat1.xy = u_xlat1.xy * u_xlat1.xy;
u_xlat1.x = u_xlat1.y + u_xlat1.x;
u_xlat1.x = sqrt(u_xlat1.x);
u_xlat9 = u_xlat9 * 0.5;
#ifdef UNITY_ADRENO_ES3
u_xlatb9 = !!(u_xlat1.x<u_xlat9);
#else
u_xlatb9 = u_xlat1.x<u_xlat9;
#endif
u_xlatb6 = u_xlatb9 && u_xlatb6;
if(u_xlatb6){
SV_Target0 = vec4(1.0, 1.0, 0.0, 0.5);
return;
//ENDIF
}
//ENDIF
}
}
for(int u_xlati_loop_3 = 0 ; u_xlati_loop_3<PointNum ; u_xlati_loop_3++)
{
TempArray0[u_xlati_loop_3].x = Value[u_xlati_loop_3].x;
TempArray1[u_xlati_loop_3].x = Value[u_xlati_loop_3].y;
}
u_xlati1.y = 0;
u_xlati1.x = u_xlati0;
u_xlati3 = 0;
while(true){
#ifdef UNITY_ADRENO_ES3
u_xlatb6 = !!(u_xlati1.y>=PointNum);
#else
u_xlatb6 = u_xlati1.y>=PointNum;
#endif
if(u_xlatb6){break;}
u_xlat6.x = TempArray1[u_xlati1.y].x;
#ifdef UNITY_ADRENO_ES3
{ bool cond = gl_FragCoord.y<u_xlat6.x; u_xlati9 = int(!!cond ? 0xFFFFFFFFu : uint(0u)); }
#else
u_xlati9 = int((gl_FragCoord.y<u_xlat6.x) ? 0xFFFFFFFFu : uint(0u));
#endif
u_xlat7.x = TempArray1[u_xlati1.x].x;
#ifdef UNITY_ADRENO_ES3
{ bool cond = gl_FragCoord.y<u_xlat7.x; u_xlati10 = int(!!cond ? 0xFFFFFFFFu : uint(0u)); }
#else
u_xlati10 = int((gl_FragCoord.y<u_xlat7.x) ? 0xFFFFFFFFu : uint(0u));
#endif
#ifdef UNITY_ADRENO_ES3
u_xlatb9 = !!(u_xlati9!=u_xlati10);
#else
u_xlatb9 = u_xlati9!=u_xlati10;
#endif
u_xlat10 = TempArray0[u_xlati1.x].x;
u_xlat2 = TempArray0[u_xlati1.y].x;
u_xlat10 = u_xlat10 + (-u_xlat2);
u_xlat5 = (-u_xlat6.x) + gl_FragCoord.y;
u_xlat10 = u_xlat10 * u_xlat5;
u_xlat6.x = (-u_xlat6.x) + u_xlat7.x;
u_xlat6.x = u_xlat10/u_xlat6.x;
u_xlat6.x = u_xlat2 + u_xlat6.x;
#ifdef UNITY_ADRENO_ES3
u_xlatb6 = !!(gl_FragCoord.x<u_xlat6.x);
#else
u_xlatb6 = gl_FragCoord.x<u_xlat6.x;
#endif
u_xlatb6 = u_xlatb6 && u_xlatb9;
u_xlati9 = ~u_xlati3;
u_xlati3 = (u_xlatb6) ? u_xlati9 : u_xlati3;
u_xlati1.x = u_xlati1.y + 1;
u_xlati1.xy = u_xlati1.yx;
}
if(u_xlati3 != 0) {
SV_Target0 = vec4(0.0, 1.0, 0.0, 0.300000012);
return;
//ENDIF
}
SV_Target0 = vec4(0.0, 0.0, 0.0, 0.0);
return;
}
#endif
-- Fragment shader for "gles3":
Shader Disassembly:
// All GLSL source is contained within the vertex program
}
}
}
輝煌，這曾經魅力！謝謝 ：） –