120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
#include <cstdint>
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#include "align.hpp"
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#include "vga.hpp"
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#include "holly/texture_memory_alloc.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 "macaw.hpp"
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struct vertex {
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float x;
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float y;
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float z;
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float u;
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float v;
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uint32_t color;
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};
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const struct vertex strip_vertices[4] = {
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// [ position ] [ uv coordinates ] [color ]
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{ -0.5f, 0.5f, 0.f, 0.f , 127.f/128.f, 0x00000000}, // the first two base colors in a
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{ -0.5f, -0.5f, 0.f, 0.f , 0.f , 0x00000000}, // non-Gouraud triangle strip are ignored
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{ 0.5f, 0.5f, 0.f, 127.f/128.f, 127.f/128.f, 0xffff00ff},
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{ 0.5f, -0.5f, 0.f, 127.f/128.f, 0.f , 0xffffff00},
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};
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constexpr uint32_t strip_length = (sizeof (strip_vertices)) / (sizeof (struct vertex));
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uint32_t _ta_parameter_buf[((32 * (strip_length + 2)) + 32) / 4];
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static float theta = 0;
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constexpr float half_degree = 0.01745329f / 2.f;
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uint32_t transform(uint32_t * ta_parameter_buf,
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const vertex * strip_vertices,
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const uint32_t strip_length)
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{
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auto ta_parameter = reinterpret_cast<union ta_parameter *>(ta_parameter_buf);
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int ix = 0;
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uint32_t texture_address = (offsetof (struct texture_memory_alloc, texture));
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ta_parameter[ix++].global_polygon_type_0 = global_polygon_type_0(texture_address);
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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 = strip_vertices[i].x;
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float y = strip_vertices[i].y;
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float z = strip_vertices[i].z;
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float x1;
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x1 = x * __builtin_cosf(theta) - z * __builtin_sinf(theta);
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z = x * __builtin_sinf(theta) + z * __builtin_cosf(theta);
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x = x1;
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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.f / (z + 10.f);
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ta_parameter[ix++].vertex_polygon_type_3 =
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vertex_polygon_type_3(x, y, z,
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strip_vertices[i].u,
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strip_vertices[i].v,
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strip_vertices[i].color,
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end_of_strip);
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}
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ta_parameter[ix++].global_end_of_list = global_end_of_list();
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theta += half_degree;
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return ix * 32;
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}
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void main()
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{
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vga();
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auto src = reinterpret_cast<const uint8_t *>(&_binary_macaw_data_start);
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auto size = reinterpret_cast<const uint32_t>(&_binary_macaw_data_size);
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auto mem = reinterpret_cast<texture_memory_alloc *>(0xa400'0000);
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for (uint32_t px = 0; px < size / 3; px++) {
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uint8_t r = src[px * 3 + 0];
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uint8_t g = src[px * 3 + 1];
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uint8_t b = src[px * 3 + 2];
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uint16_t rgb565 = ((r / 8) << 11) | ((g / 4) << 5) | ((b / 8) << 0);
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mem->texture[px] = rgb565;
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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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core_init_texture_memory();
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// the address of `scene` 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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while (true) {
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v_sync_out();
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v_sync_in();
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ta_polygon_converter_init();
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uint32_t ta_parameter_size = transform(ta_parameter_buf, strip_vertices, strip_length);
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ta_polygon_converter_transfer(ta_parameter_buf, ta_parameter_size);
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ta_wait_opaque_list();
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constexpr int frame_ix = 0;
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constexpr int num_frames = 0;
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core_start_render(frame_ix, num_frames);
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}
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}
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