光线通过几何着色器改变

Question

我目前正在使用 FragmentShader 和 VertexShader，并且工作得很好。我无法让我的几何着色器正常工作。我对它绝对是新手，下面是我尝试过的。

我正在使用 VBO、照明和纹理以及一些几何体，但在使用 GeometryShader 之前它工作正常。我唯一改变的是变量名，因为我必须在几何着色器中获取输入并给出输出。所以我在那些将从几何着色器传到片段着色器的变量名的末尾附加了 1。

我还添加了以 # 开头的 headers，之前不存在。我正在使用 GL_TRIANGLES 绘图。

顶点着色器

uniform mat4 local2clip;
uniform mat4 local2eye;
uniform mat4 normal_matrix;
uniform mat4 world2eye; 

uniform vec4 light_ambient;
uniform vec4 light_diffuse;
uniform vec4 light_specular;
uniform vec4 light_pos;


uniform vec4 mat_ambient;
uniform vec4 mat_diffuse;
uniform vec4 mat_specular;
uniform float mat_shine; 

//varying vec3 v_normal;  // vertex normal 
out vec2 FtexCoord; 

void main(){

       gl_Position = local2clip * position;

       N =     normalize(vec3(normal_matrix * normal));    //v_normal
       vec4 Lpos =  world2eye * light_pos;                  //light pos. in eye
       vec4 Vpos =  local2eye * position;                   //pos_in_eye
       L = normalize(vec3(Lpos - Vpos));                    //light_vector

       R = normalize(reflect(-L, N)); 
       V = normalize(vec3(-Vpos));                          //eye vector

       vec3 halfv = normalize(L+V);
       FtexCoord = texCoord; 

       //pcolor = color1;
}

这是我的 FragmentShader

#version 330 compatibility

uniform int use_texture; 

in vec4 pcolor; 

in vec3 N1;
in vec3 L1;
in vec3 R1;
in vec3 V1;


uniform mat4 local2clip;
uniform mat4 local2eye;
uniform mat4 normal_matrix;
uniform mat4 world2eye; 

uniform vec4 light_ambient;
uniform vec4 light_diffuse;
uniform vec4 light_specular;
uniform vec4 light_pos;

uniform vec4 mat_ambient;
uniform vec4 mat_diffuse;
uniform vec4 mat_specular;
uniform float mat_shine;

uniform sampler2D Tex1; 
in vec2 FtexCoord1; 

void main() { 

       vec4 ambient = light_ambient * mat_ambient;
       float NdotL; 
       if (dot(N1,L1) <0.0) NdotL = 0.0; 
       else NdotL = dot(N1, L1); 

       vec4 diffuse = light_diffuse * mat_diffuse * NdotL;

       float RdotV; 
       RdotV = dot(R1, V1); 

       if (NdotL == 0.0) RdotV = 0.0; 
       if (RdotV <0.0) RdotV = 0.0; 

       vec4 specular = light_specular * mat_specular * pow(RdotV,mat_shine);   

       vec4 texcolor;


       if( use_texture == 1 ) {
          texcolor = texture2D(Tex1, FtexCoord1); 
          gl_FragColor = texcolor; 
       }
       else
          gl_FragColor = (diffuse + ambient + specular); 
 }

这是我的几何着色器

#version 330

layout (triangles) in;
layout (triangle_strip, max_vertices = 3) out;

out vec3 N1;
out vec3 L1;
out vec3 R1;
out vec3 V1;

in vec3 N[3];
in vec3 L[3];
in vec3 R[3];
in vec3 V[3];

uniform mat4 local2clip;
uniform mat4 local2eye;
uniform mat4 normal_matrix;
uniform mat4 world2eye; 

uniform vec4 light_ambient;
uniform vec4 light_diffuse;
uniform vec4 light_specular;
uniform vec4 light_pos;

uniform vec4 mat_ambient;
uniform vec4 mat_diffuse;
uniform vec4 mat_specular;
uniform float mat_shine; 

//varying vec3 v_normal;  // vertex normal 
out vec2 FtexCoord1; 

in vec2 FtexCoord[3]; 

void main(void)
{
    int i;



    for (i = 0; i < gl_in.length(); i++)
    {
        N1=N[i];
        L1=L[i];
        R1=R[i];
        V1=R[i];

        FtexCoord1=FtexCoord[i]; 

        gl_Position = gl_in[i].gl_Position;
        EmitVertex();
    }
    EndPrimitive();
}

我只希望之前存在的内容通过几何着色器从顶点着色器传递到片段着色器，以便我稍后可以操作着色器。但是光线与图片中显示的不一样 effect.As。

Answer 1

code.It 中有一个小错误应该是 V1=V[i]; 而不是 V1=R[i];

光线通过几何着色器改变

Light changes with Pass Through Geometry Shader

opengl

glsl

geometry-shader