#include "sh/common.hlsl"

/* ========================== *
 * Root signature
 * ========================== */

#define ROOTSIG \
    "RootConstants(num32BitConstants=16, b0), " \
    "SRV(t0), " \
    "SRV(t1), " \
    "DescriptorTable(SRV(t2, numDescriptors = unbounded, flags = DESCRIPTORS_VOLATILE)), " \
    "StaticSampler(s0, " \
                  "filter = FILTER_MIN_MAG_MIP_POINT, " \
                  "addressU = TEXTURE_ADDRESS_CLAMP, " \
                  "addressV = TEXTURE_ADDRESS_CLAMP, " \
                  "addressW = TEXTURE_ADDRESS_CLAMP, " \
                  "maxAnisotropy = 1)"

ConstantBuffer<struct sh_material_constants> g_constants : register(b0);
StructuredBuffer<struct sh_material_instance> g_instances : register(t0);
StructuredBuffer<struct sh_material_grid> g_grids : register(t1);
Texture2D g_textures[] : register(t2);

SamplerState g_sampler : register(s0);

/* ========================== *
 * Vertex shader
 * ========================== */

struct vs_output {
    DECLS(float4, SV_Position);
    DECLS(float4, color_lin);
};

SH_ENTRY(ROOTSIG) struct vs_output vs(struct sh_shape_vert input)
{
    struct vs_output output;
    output.SV_Position = mul(g_constants.projection, float4(input.pos, 0, 1));
    output.color_lin = linear_from_srgb32(input.color_srgb);
    return output;
}

/* ========================== *
 * Pixel shader
 * ========================== */

struct ps_input {
    struct vs_output vs;
};

struct ps_output {
    DECLS(float4, SV_Target);
};

SH_ENTRY(ROOTSIG) struct ps_output ps(struct ps_input input)
{
    struct ps_output output;
    output.SV_Target = input.vs.color_lin;
    return output;
}