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VERTEX_SHADER = """
#version 330 core
layout (location = 0) in vec3 position;
layout (location=1) in vec2 a_texcoord; // Vertex texture coordinates
out vec2 v_texcoord; // Interpolated fragment texture coordinates (out)
out vec3 FragPos;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
FragPos = vec3(model * vec4(position, 1.0f));
v_texcoord = a_texcoord;
}
"""
GEOMETRY_SHADER = """
#version 330
layout(triangles) in;
layout(triangle_strip, max_vertices=3) out;
in vec2 v_texcoord [];
in vec3 FragPos [];
out vec3 normal;
out vec3 ex_FragPos;
out vec2 ex_textcoord;
void main( void )
{
//vec3 a = ( gl_in[1].gl_Position - gl_in[0].gl_Position ).xyz;
vec3 a = FragPos[1]-FragPos[0];
//vec3 b = ( gl_in[2].gl_Position - gl_in[0].gl_Position ).xyz;
vec3 b = FragPos[2]-FragPos[0];
vec3 N = -normalize( cross( b, a ) );
for( int i=0; i<gl_in.length( ); ++i )
{
gl_Position = gl_in[i].gl_Position;
normal = N;
ex_FragPos=FragPos[i];
ex_textcoord=v_texcoord[i];
EmitVertex( );
}
EndPrimitive( );
}
"""
FRAGMENT_SHADER = """
#version 330 core
in vec3 ex_FragPos;
in vec3 normal;
in vec2 ex_textcoord; // Interpolated fragment texture coordinates (in)
out vec4 color;
//uniform vec3 lightPos;
//uniform vec3 objectColor;
uniform sampler2D u_texture; // Texture
void main()
{
vec4 t_color = texture(u_texture, ex_textcoord);
if(normal.z<0)
color = t_color;
else
color=vec4(0,0,0,1.0);
}
"""
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