rend3-routine 0.3.0

Customizable Render Routines for the rend3 rendering library.
Documentation 
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#version 440

#include "structures.glsl"

// TODO: we don't need most of these
layout(location = 0) in vec3 i_position;
layout(location = 1) in vec3 i_normal;
layout(location = 2) in vec3 i_tangent;
layout(location = 3) in vec2 i_coords0;
layout(location = 4) in vec2 i_coords1;
layout(location = 5) in vec4 i_color;
#ifdef GPU_DRIVEN
layout(location = 8) in uint i_object_idx;
#endif

layout(location = 0) out vec4 o_position;
layout(location = 1) out vec2 o_coords0;
layout(location = 2) out vec4 o_color;
layout(location = 3) flat out uint o_material;

layout(set = 1, binding = 0, std430) readonly buffer ObjectOutputDataBuffer {
    ObjectOutputData object_output[];
};

void main() {
    #ifdef CPU_DRIVEN
    uint object_idx = gl_InstanceIndex;
    #else
    uint object_idx = i_object_idx;
    #endif

    ObjectOutputData data = object_output[object_idx];

    vec4 position = data.model_view_proj * vec4(i_position, 1.0);
    o_position = position;
    gl_Position = position;

    o_material = data.material_idx;

    o_color = i_color;

    o_coords0 = i_coords0;
}