Zack Buhman
54f09bad01
The main issue with the previous code: constexpr uint32_t tiles = (640 / 32) * (320 / 32); Should have been: constexpr uint32_t tiles = (640 / 32) * (480 / 32); The consequence of this is some OPBs were being overwritten by TA_NEXT_OPB, causing corruption (missing triangles, incomplete drawings) in some tiles.
296 lines
8.2 KiB
C++
296 lines
8.2 KiB
C++
#include <cstdint>
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#include "align.hpp"
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#include "vga.hpp"
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#include "holly.hpp"
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#include "holly/core.hpp"
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#include "holly/core_bits.hpp"
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#include "holly/ta_fifo_polygon_converter.hpp"
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#include "holly/ta_parameter.hpp"
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#include "holly/ta_bits.hpp"
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#include "holly/region_array.hpp"
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#include "holly/background.hpp"
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#include "holly/texture_memory_alloc.hpp"
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#include "memorymap.hpp"
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#include "serial.hpp"
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#include "geometry/icosphere.hpp"
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#include "geometry/suzanne.hpp"
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#include "math/vec4.hpp"
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constexpr float half_degree = 0.01745329f / 2;
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#define MODEL icosphere
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vec3 rotate(const vec3& vertex, float theta)
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{
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float x = vertex.x;
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float y = vertex.y;
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float z = vertex.z;
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float t;
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t = y * cos(theta) - z * sin(theta);
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z = y * sin(theta) + z * cos(theta);
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y = t;
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float theta2 = 3.14 * sin(theta / 2);
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t = x * cos(theta2) - z * sin(theta2);
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z = x * sin(theta2) + z * cos(theta2);
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x = t;
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return vec3(x, y, z);
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}
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void transform(ta_parameter_writer& parameter,
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const uint32_t face_ix,
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const float theta,
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const vec3 lights[3])
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{
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const uint32_t parameter_control_word = para_control::para_type::polygon_or_modifier_volume
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| para_control::list_type::opaque
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| obj_control::col_type::floating_color
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| obj_control::gouraud;
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const uint32_t isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater
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| isp_tsp_instruction_word::culling_mode::cull_if_positive;
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const uint32_t tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
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| tsp_instruction_word::dst_alpha_instr::zero
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| tsp_instruction_word::fog_control::no_fog;
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parameter.append<global_polygon_type_0>() = global_polygon_type_0(parameter_control_word,
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isp_tsp_instruction_word,
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tsp_instruction_word,
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0);
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auto& face = MODEL::faces[face_ix];
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constexpr uint32_t strip_length = 3;
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for (uint32_t i = 0; i < strip_length; i++) {
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bool end_of_strip = i == strip_length - 1;
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// world transform
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uint32_t vertex_ix = face[i].vertex;
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auto& vertex = MODEL::vertices[vertex_ix];
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auto point = rotate(vertex, theta);
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// lighting transform
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uint32_t normal_ix = face[i].normal;
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auto& normal = MODEL::normals[normal_ix];
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auto n = rotate(normal, theta);
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vec4 color = {0.3, 0.3, 0.3, 1.0};
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// intensity calculation
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{
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auto l = lights[0] - point;
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auto n_dot_l = dot(n, l);
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if (n_dot_l > 0) {
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color.x += 0.5 * n_dot_l / (length(n) * length(l));
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}
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}
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{
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auto l = lights[1] - point;
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auto n_dot_l = dot(n, l);
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if (n_dot_l > 0) {
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color.y += 0.5 * n_dot_l / (length(n) * length(l));
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}
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}
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{
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auto l = lights[2] - point;
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auto n_dot_l = dot(n, l);
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if (n_dot_l > 0) {
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color.z += 0.5 * n_dot_l / (length(n) * length(l));
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}
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}
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float x = point.x;
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float y = point.y;
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float z = point.z;
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x *= 8;
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y *= 8;
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z *= 8;
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// camera transform
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z += 15;
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// perspective
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x = x / z;
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y = y / z;
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// screen space transform
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x *= 240.f;
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y *= 240.f;
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x += 320.f;
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y += 240.f;
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z = 1 / z;
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parameter.append<vertex_polygon_type_1>() =
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vertex_polygon_type_1(x, y, z,
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color.w, // alpha
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color.x, // r
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color.y, // g
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color.z, // b
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end_of_strip);
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}
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}
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void transform2(ta_parameter_writer& parameter,
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const vec3& pos,
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const vec4& color)
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{
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const uint32_t parameter_control_word = para_control::para_type::polygon_or_modifier_volume
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| para_control::list_type::opaque
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| obj_control::col_type::floating_color
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| obj_control::gouraud;
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const uint32_t isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater
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| isp_tsp_instruction_word::culling_mode::no_culling;
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const uint32_t tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
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| tsp_instruction_word::dst_alpha_instr::zero
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| tsp_instruction_word::fog_control::no_fog;
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parameter.append<global_polygon_type_0>() = global_polygon_type_0(parameter_control_word,
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isp_tsp_instruction_word,
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tsp_instruction_word,
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0);
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constexpr vec3 triangle[] = {
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{ 0.f, -1.f, 0.f},
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{-1.f, 1.f, 0.f},
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{ 1.f, 1.f, 0.f},
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};
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constexpr uint32_t strip_length = 3;
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for (uint32_t i = 0; i < strip_length; i++) {
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bool end_of_strip = i == strip_length - 1;
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float x = triangle[i].x;
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float y = triangle[i].y;
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float z = triangle[i].z;
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x *= 0.2;
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y *= 0.2;
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z *= 0.2;
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x += pos.x;
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y += pos.y;
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z += pos.z;
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// camera transform
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z += 15;
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// perspective
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x = x / z;
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y = y / z;
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// screen space transform
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x *= 240.f;
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y *= 240.f;
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x += 320.f;
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y += 240.f;
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z = 1 / z;
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parameter.append<vertex_polygon_type_1>() =
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vertex_polygon_type_1(x, y, z,
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color.w, // alpha
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color.x, // r
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color.y, // g
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color.z, // b
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end_of_strip);
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}
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}
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void init_texture_memory(const struct opb_size& opb_size)
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{
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auto mem = reinterpret_cast<volatile texture_memory_alloc *>(texture_memory32);
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background_parameter(mem->background, 0xff220000);
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region_array2(mem->region_array,
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(offsetof (struct texture_memory_alloc, object_list)),
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640 / 32, // width
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480 / 32, // height
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opb_size
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);
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}
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uint32_t _ta_parameter_buf[((32 * (5 * 6 + 1)) + 32) / 4];
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void main()
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{
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vga();
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// The address of `ta_parameter_buf` must be a multiple of 32 bytes.
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// This is mandatory for ch2-dma to the ta fifo polygon converter.
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uint32_t * ta_parameter_buf = align_32byte(_ta_parameter_buf);
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constexpr uint32_t ta_alloc = ta_alloc_ctrl::pt_opb::no_list
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| ta_alloc_ctrl::tm_opb::no_list
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| ta_alloc_ctrl::t_opb::no_list
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| ta_alloc_ctrl::om_opb::no_list
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| ta_alloc_ctrl::o_opb::_16x4byte;
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constexpr struct opb_size opb_size = { .opaque = 16 * 4
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, .opaque_modifier = 0
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, .translucent = 0
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, .translucent_modifier = 0
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, .punch_through = 0
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};
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holly.SOFTRESET = softreset::pipeline_soft_reset
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| softreset::ta_soft_reset;
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holly.SOFTRESET = 0;
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core_init();
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init_texture_memory(opb_size);
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uint32_t frame_ix = 0;
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constexpr uint32_t num_frames = 1;
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float theta = 0;
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vec3 lights[3] = {
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{0.f, 0.f, 0.f},
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{0.f, 0.f, 0.f},
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{0.f, 0.f, 0.f},
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};
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while (1) {
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ta_polygon_converter_init(opb_size.total(),
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ta_alloc,
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640 / 32,
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480 / 32);
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lights[0].x = cos(theta) * 10;
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lights[0].z = sin(theta) * 10;
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lights[1].x = cos(theta + half_degree * 180.f) * 10;
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lights[1].z = sin(theta + half_degree * 180.f) * 10;
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lights[2].x = cos(theta + half_degree * 360.f) * 10;
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lights[2].z = sin(theta + half_degree * 360.f) * 10;
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auto parameter = ta_parameter_writer(ta_parameter_buf);
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for (uint32_t i = 0; i < MODEL::num_faces; i++) {
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transform(parameter, i, theta, lights);
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}
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transform2(parameter, lights[0], {1.f, 0.f, 0.f, 1.f});
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transform2(parameter, lights[1], {0.f, 1.f, 0.f, 1.f});
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transform2(parameter, lights[2], {0.f, 0.f, 1.f, 1.f});
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parameter.append<global_end_of_list>() = global_end_of_list();
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ta_polygon_converter_transfer(ta_parameter_buf, parameter.offset);
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ta_wait_opaque_list();
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core_start_render(frame_ix, num_frames);
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v_sync_out();
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core_wait_end_of_render_video(frame_ix, num_frames);
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theta += half_degree;
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frame_ix += 1;
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}
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}
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