# Terrain effect
# This effect uses prodecural shader splatting, you most likely want to modify
# it with your own texture-map generation code.

vertex:
    inout: |
        uniform samplerBuffer InstancingData;


    transform: |

        int data_index = gl_InstanceID * 4;
    
        vec4 data_0 = texelFetch(InstancingData, data_index);
        vec4 data_1 = texelFetch(InstancingData, data_index + 1);
        vec4 data_2 = texelFetch(InstancingData, data_index + 2);
        vec4 data_3 = texelFetch(InstancingData, data_index + 3);

        mat4 transform_mat = mat4(data_0, data_1, data_2, data_3);

        vOutput.position = (transform_mat * p3d_Vertex).xyz;
        // Also transform normal, not 100% correct but works out nicely
        vOutput.normal = mat3(transform_mat) * vOutput.normal;


fragment: