dreamcast/holly/isp_tsp.hpp

#pragma once

#include <cstdint>

namespace isp_tsp_instruction_word {
  namespace depth_compare_mode {
    constexpr uint32_t never = 0 << 29;
    constexpr uint32_t less = 1 << 29;
    constexpr uint32_t equal = 2 << 29;
    constexpr uint32_t less_or_equal = 3 << 29;
    constexpr uint32_t greater = 4 << 29;
    constexpr uint32_t not_equal = 5 << 29;
    constexpr uint32_t greater_or_equal = 6 << 29;
    constexpr uint32_t always = 7 << 29;
  }

  namespace volume_instruction {
    constexpr uint32_t normal_polygon = 0 << 29;
    constexpr uint32_t inside_last_polygon = 1 << 29;
    constexpr uint32_t outside_last_polygon = 1 << 29;
  }

  namespace culling_mode {
    constexpr uint32_t no_culling = 0 << 27;
    constexpr uint32_t cull_if_small = 1 << 27;     // compared to FPU_CULL_VAL
    constexpr uint32_t cull_if_negative = 2 << 27;
    constexpr uint32_t cull_if_positive = 3 << 27;
  }

  constexpr uint32_t z_write_disable = 1 << 26;
  constexpr uint32_t texture = 1 << 25;
  constexpr uint32_t offset = 1 << 24;
  constexpr uint32_t gouraud_shading = 1 << 23;
  constexpr uint32_t _16bit_uv = 1 << 22;
  constexpr uint32_t cache_bypass = 1 << 21;
  constexpr uint32_t dcalc_ctrl = 1 << 20;
}

namespace tsp_instruction_word {
  namespace src_alpha_instr {
    constexpr uint32_t zero = 0 << 29;
    constexpr uint32_t one = 1 << 29;
    constexpr uint32_t other_color = 2 << 29;
    constexpr uint32_t inverse_other_color = 3 << 29;
    constexpr uint32_t src_alpha = 4 << 29;
    constexpr uint32_t inverse_src_alpha = 5 << 29;
    constexpr uint32_t dst_alpha = 6 << 29;
    constexpr uint32_t inverse_dst_alpha = 7 << 29;
  }

  namespace dst_alpha_instr {
    constexpr uint32_t zero = 0 << 26;
    constexpr uint32_t one = 1 << 26;
    constexpr uint32_t other_color = 2 << 26;
    constexpr uint32_t inverse_other_color = 3 << 26;
    constexpr uint32_t src_alpha = 4 << 26;
    constexpr uint32_t inverse_src_alpha = 5 << 26;
    constexpr uint32_t dst_alpha = 6 << 26;
    constexpr uint32_t inverse_dst_alpha = 7 << 26;
  }

  namespace src_select {
    constexpr uint32_t primary_accumulation_buffer = 0 << 25;
    constexpr uint32_t secondary_accumulation_buffer = 1 << 25;
  }

  namespace dst_select {
    constexpr uint32_t primary_accumulation_buffer = 0 << 24;
    constexpr uint32_t secondary_accumulation_buffer = 1 << 24;
  }

  namespace fog_control {
    constexpr uint32_t look_up_table = 0b00 << 22;
    constexpr uint32_t per_vertex = 0b01 << 22;
    constexpr uint32_t no_fog = 0b10 << 22;
    constexpr uint32_t look_up_table_mode_2 = 0b11 << 22;
  }

  constexpr uint32_t color_clamp = 1 << 21;
  constexpr uint32_t use_alpha = 1 << 20;
  constexpr uint32_t ignore_tex_alpha = 1 << 19;

  namespace flip_uv {
    constexpr uint32_t none = 0 << 17;
    constexpr uint32_t v = 1 << 17;
    constexpr uint32_t u = 2 << 17;
    constexpr uint32_t uv = 3 << 17;
  }

  namespace clamp_uv {
    constexpr uint32_t none = 0 << 15;
    constexpr uint32_t v = 1 << 15;
    constexpr uint32_t u = 2 << 15;
    constexpr uint32_t uv = 3 << 15;
  }

  namespace filter_mode {
    constexpr uint32_t point_sampled = 0b00 << 13;
    constexpr uint32_t bilinear_filter = 0b01 << 13;
    constexpr uint32_t trilinear_pass_a = 0b10 << 13;
    constexpr uint32_t trilinear_pass_b = 0b11 << 13;
  }

  constexpr uint32_t super_sample_texture = 1 << 12;

  constexpr uint32_t mip_map_d_adjust(uint32_t fp)
  {
    return (fp & 0b1111) << 8;
  }

  namespace texture_shading_instruction {
    constexpr uint32_t decal = 0 << 6;
    constexpr uint32_t modulate = 1 << 6;
    constexpr uint32_t decal_alpha = 2 << 6;
    constexpr uint32_t modulate_alpha = 3 << 6;
  }

  namespace texture_u_size {
    constexpr uint32_t _8 = 0 << 3;
    constexpr uint32_t _16 = 1 << 3;
    constexpr uint32_t _32 = 2 << 3;
    constexpr uint32_t _64 = 3 << 3;
    constexpr uint32_t _128 = 4 << 3;
    constexpr uint32_t _256 = 5 << 3;
    constexpr uint32_t _512 = 6 << 3;
    constexpr uint32_t _1024 = 7 << 3;

    constexpr uint32_t from_int(uint32_t n) {
      switch (n) {
      default: [[fallthrough]];
      case 8: return _8;
      case 16: return _16;
      case 32: return _32;
      case 64: return _64;
      case 128: return _128;
      case 256: return _256;
      case 512: return _512;
      case 1024: return _1024;
      }
    }
  }

  namespace texture_v_size {
    constexpr uint32_t _8 = 0 << 0;
    constexpr uint32_t _16 = 1 << 0;
    constexpr uint32_t _32 = 2 << 0;
    constexpr uint32_t _64 = 3 << 0;
    constexpr uint32_t _128 = 4 << 0;
    constexpr uint32_t _256 = 5 << 0;
    constexpr uint32_t _512 = 6 << 0;
    constexpr uint32_t _1024 = 7 << 0;

    constexpr uint32_t from_int(uint32_t n) {
      switch (n) {
      default: [[fallthrough]];
      case 8: return _8;
      case 16: return _16;
      case 32: return _32;
      case 64: return _64;
      case 128: return _128;
      case 256: return _256;
      case 512: return _512;
      case 1024: return _1024;
      }
    }
  }
}

namespace texture_control_word {
  constexpr uint32_t mip_mapped = 1 << 31;
  constexpr uint32_t vq_compressed = 1 << 30;

  namespace pixel_format {
    constexpr uint32_t _1555 = 0 << 27;
    constexpr uint32_t _565 = 1 << 27;
    constexpr uint32_t _4444 = 2 << 27;
    constexpr uint32_t yuv422 = 3 << 27;
    constexpr uint32_t bump_map = 4 << 27;
    constexpr uint32_t _4bpp_palette = 5 << 27;
    constexpr uint32_t _8bpp_palette = 6 << 27;
  }

  namespace scan_order {
    constexpr uint32_t twiddled = 0 << 26;
    constexpr uint32_t non_twiddled = 1 << 26;
  }

  constexpr uint32_t palette_selector4(uint32_t a) {
    return (a & 0x3f) << 21;
  }

  constexpr uint32_t palette_selector8(uint32_t a) {
    return (a & 0x3) << 25;
  }

  constexpr uint32_t stride_select = 1 << 25;

  // in 8-byte units
  constexpr uint32_t texture_address(uint32_t a) {
    return a & 0x1fffff;
  }
}