stk-code_catmod/data/shaders/skinning_shadow.vert

uniform mat4 ModelMatrix;
uniform int skinning_offset;
uniform int layer;
uniform samplerBuffer skinning_tex;

#ifdef Explicit_Attrib_Location_Usable
layout(location = 0) in vec3 Position;
layout(location = 3) in vec4 Data1;
layout(location = 5) in ivec4 Joint;
layout(location = 6) in vec4 Weight;
#else
in vec3 Position;
in vec4 Data1;
in ivec4 Joint;
in vec4 Weight;
#endif

#ifdef VSLayer
out vec2 uv;
#else
out vec2 tc;
out int layerId;
#endif

void main(void)
{
    vec4 idle_position = vec4(Position, 1.);
    vec4 skinned_position = vec4(0.);
    if (Weight[0] < 0.01)
    {
        skinned_position = idle_position;
    }
    else
    {
        for (int i = 0; i < 4; i++)
        {
            if (Weight[i] < 0.01)
            {
                break;
            }
            mat4 joint_matrix = mat4(
                texelFetch(skinning_tex, (Joint[i] + skinning_offset) * 4),
                texelFetch(skinning_tex, (Joint[i] + skinning_offset) * 4 + 1),
                texelFetch(skinning_tex, (Joint[i] + skinning_offset) * 4 + 2),
                texelFetch(skinning_tex, (Joint[i] + skinning_offset) * 4 + 3));
            skinned_position += Weight[i] * joint_matrix * idle_position;
        }
    }

#ifdef VSLayer
    gl_Layer = layer;
    uv = Data1.xy;
    gl_Position = ShadowViewProjMatrixes[gl_Layer] * ModelMatrix * skinned_position;
#else
    layerId = layer;
    tc = Data1.xy;
    gl_Position = ShadowViewProjMatrixes[layerId] * ModelMatrix * skinned_position;
#endif
}