GLSL Bumped Specular Initial

gistfile1.c

#ifdef VERTEX
attribute vec4 a_position;
attribute vec2 a_uv;
attribute vec3 a_normal;
attribute vec4 a_tangent;

uniform mat4 u_mvp;
uniform mat4 u_world2object;
uniform vec4 u_worldlightdir;
uniform vec4 u_worldcampos;

varying vec2 v_uv;
varying vec3 v_lightdir;
varying vec3 v_viewdir;

void main()
{
	gl_Position = u_mvp * a_position;
	v_uv = a_uv;
	
	vec3 bitan = cross (a_normal.xyz, a_tangent.xyz) * a_tangent.w;
	mat3 tsprotation = mat3 (
		a_tangent.x, bitan.x, a_normal.x,
		a_tangent.y, bitan.y, a_normal.y,
		a_tangent.z, bitan.z, a_normal.z);
	
	vec3 objLightDir = (u_world2object * u_worldlightdir).xyz;
	vec3 objCamPos = (u_world2object * u_worldcampos).xyz;
	vec3 objViewDir = objCamPos - a_position.xyz;
	
	v_lightdir = tsprotation * objLightDir;
	v_viewdir = tsprotation * objViewDir;
}
#endif


#ifdef FRAGMENT
precision highp float;

uniform vec4 u_lightcolor;
uniform vec4 u_matcolor;
uniform float u_spec;

varying vec2 v_uv;
varying vec3 v_lightdir;
varying vec3 v_viewdir;

uniform sampler2D u_texcolor;
uniform sampler2D u_texnormal;

void main()
{
	vec4 albedo = texture2D (u_texcolor, v_uv) * u_matcolor;
	vec3 normal = texture2D (u_texnormal, v_uv).rgb * 2.0 - 1.0;
	
	vec3 halfdir = normalize (normalize(v_lightdir) + normalize(v_viewdir));
	
	float diff = max (0.0, dot (normal, v_lightdir));
	float nh = max (0.0, dot (normal, halfdir));
	float spec = pow (nh, u_spec);
	
	vec4 c = albedo * u_lightcolor * diff + u_lightcolor * spec;
	
	gl_FragColor = c;
}
#endif