I am using FragmentShader and VertexShader at present, and works absolutely fine. I cannot get my geometry shader working proprly. I am absolutely new to it, below is what I have tried.
I am using VBO, lighting and textures along with some geometry, but it works fine before using GeometryShader. The only thing I have changed is the variable names as I had to get the input in the geometry shader and give the output. So I have appended 1 at the end of those variable names those which will go out from geometry shader to the fragment shader.
Also I have added headers starting with # which were earlier not there. I am using GL_TRIANGLES to draw.
VertexShader
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;
}
This is my 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);
}
This is my Geometry Shader
#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();
}
I just want that what ever was there earlier is passed from vertex shader to fragment shader via geometry shader, so that I can manipulate the shader later. But the light is not showing the same effect.As shown in the pics.
