Zack Buhman
f400fe6412
This has turned in to an experiment related to texture sampling behavior on the Dreamcast.
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
#pragma once
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#include <cstdint>
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#include <cstddef>
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#include "../float_uint32.hpp"
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namespace para_control {
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namespace para_type {
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constexpr uint32_t end_of_list = 0 << 29;
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constexpr uint32_t user_tile_clip = 1 << 29;
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constexpr uint32_t object_list_set = 2 << 29;
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constexpr uint32_t polygon_or_modifier_volume = 4 << 29;
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constexpr uint32_t sprite = 5 << 29;
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constexpr uint32_t vertex_parameter = 7 << 29;
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}
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constexpr uint32_t end_of_strip = 1 << 28;
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namespace list_type {
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constexpr uint32_t opaque = 0 << 24;
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constexpr uint32_t opaque_modifier_volume = 1 << 24;
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constexpr uint32_t translucent = 2 << 24;
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constexpr uint32_t translucent_modifier_volume = 3 << 24;
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constexpr uint32_t punch_through = 4 << 24;
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}
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}
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namespace group_control {
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constexpr uint32_t group_en = 1 << 23;
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namespace strip_len {
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constexpr uint32_t _1_strip = 0 << 18;
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constexpr uint32_t _2_strip = 1 << 18;
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constexpr uint32_t _4_strip = 2 << 18;
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constexpr uint32_t _6_strip = 3 << 18;
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}
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namespace user_clip {
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constexpr uint32_t disabled = 0 << 16;
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constexpr uint32_t inside_enable = 2 << 16;
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constexpr uint32_t outside_enable = 3 << 16;
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}
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}
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namespace obj_control {
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constexpr uint32_t shadow = 1 << 7;
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namespace volume {
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namespace polygon {
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constexpr uint32_t with_two_volumes = 1 << 6;
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}
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namespace modifier_volume {
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constexpr uint32_t last_in_volume = 1 << 6;
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}
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}
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namespace col_type {
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constexpr uint32_t packed_color = 0 << 4;
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constexpr uint32_t floating_color = 1 << 4;
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constexpr uint32_t intensity_mode_1 = 2 << 4;
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constexpr uint32_t intensity_mode_2 = 3 << 4;
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}
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constexpr uint32_t texture = 1 << 3;
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constexpr uint32_t offset = 1 << 2;
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constexpr uint32_t gouraud = 1 << 1;
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constexpr uint32_t _16bit_uv = 1 << 0;
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}
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constexpr uint32_t polygon_vertex_parameter_control_word(const bool end_of_strip)
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{
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return para_control::para_type::vertex_parameter
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| (end_of_strip ? para_control::end_of_strip : 0);
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}
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constexpr uint32_t modifier_volume_vertex_parameter_control_word()
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{
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// DCDBSysArc990907E page 212 indirectly suggests the end_of_strip bit should
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// always be set.
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return para_control::para_type::vertex_parameter
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| para_control::end_of_strip;
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}
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struct ta_parameter_writer {
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uint32_t * buf;
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uint32_t offset; // in bytes
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ta_parameter_writer(uint32_t * buf)
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: buf(buf), offset(0)
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{ }
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template <typename T>
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inline T& append()
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{
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T& t = *reinterpret_cast<T *>(&buf[offset / 4]);
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offset += (sizeof (T));
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return t;
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}
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};
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constexpr inline uint32_t uv_16bit(float u, float v)
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{
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uint32_t * ui = (reinterpret_cast<uint32_t *>(&u));
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uint32_t * vi = (reinterpret_cast<uint32_t *>(&v));
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uint32_t u_half = ((*ui) >> 16) & 0xffff;
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uint32_t v_half = ((*vi) >> 16) & 0xffff;
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return (u_half << 16) | (v_half << 0);
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}
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