const char *skin_vert_src =
"#version 330\n"

"layout(std140) uniform State\n"
"{\n"
"	int   u_alphaTest;\n"
"	float u_alphaRef;\n"

"	int   u_fogEnable;\n"
"	float u_fogStart;\n"
"	float u_fogEnd;\n"
"	vec4  u_fogColor;\n"
"};\n"

"layout(std140) uniform Scene\n"
"{\n"
"	mat4 u_proj;\n"
"	mat4 u_view;\n"
"};\n"

"#define MAX_LIGHTS 8\n"
"struct Light {\n"
"	vec4  position;\n"
"	vec4  direction;\n"
"	vec4  color;\n"
"	float radius;\n"
"	float minusCosAngle;\n"
"};\n"

"layout(std140) uniform Object\n"
"{\n"
"	mat4  u_world;\n"
"	vec4  u_ambLight;\n"
"	int   u_numLights;\n"
"	Light u_lights[MAX_LIGHTS];\n"
"};\n"

"uniform vec4 u_matColor;\n"
"uniform vec4 u_surfaceProps;	// amb, spec, diff, extra\n"

"layout(location = 0) in vec3 in_pos;\n"
"layout(location = 1) in vec3 in_normal;\n"
"layout(location = 2) in vec4 in_color;\n"
"layout(location = 3) in vec2 in_tex0;\n"
"layout(location = 11) in vec4 in_weights;\n"
"layout(location = 12) in vec4 in_indices;\n"

"uniform mat4 u_boneMatrices[64];\n"

"out vec4 v_color;\n"
"out vec2 v_tex0;\n"
"out float v_fog;\n"

"void\n"
"main(void)\n"
"{\n"
"	mat4 m = u_boneMatrices[int(in_indices[0])] * in_weights[0];\n"
"	m +=     u_boneMatrices[int(in_indices[1])] * in_weights[1];\n"
"	m +=     u_boneMatrices[int(in_indices[2])] * in_weights[2];\n"
"	m +=     u_boneMatrices[int(in_indices[3])] * in_weights[3];\n"
"	mat4 world = u_world * m;\n"

"	vec4 V = world * vec4(in_pos, 1.0);\n"
"	vec4 cV = u_view * V;   \n"
"	gl_Position = u_proj * cV;\n"
"	vec3 N = mat3(world) * in_normal;\n"

"	v_color = in_color;\n"
"	for(int i = 0; i < u_numLights; i++){\n"
"		float L = max(0.0, dot(N, -normalize(u_lights[i].direction.xyz)));\n"
"		v_color.rgb += u_lights[i].color.rgb*L*u_surfaceProps.z;\n"
"	}\n"
"	v_color.rgb += u_ambLight.rgb*u_surfaceProps.x;\n"
"	v_color *= u_matColor;\n"

"	v_tex0 = in_tex0;\n"

"        v_fog = clamp((cV.z - u_fogEnd)/(u_fogStart - u_fogEnd), 0.0, 1.0);\n"
"}\n"
;