Zack Buhman
511d99563d
From the GCC manual.
> GCC permits a C structure to have no members:
struct empty {
};
> The structure has size zero. In C++, empty structures are part of the
> language. G++ treats empty structures as if they had a single member of type
> char.
I was not aware of the different behavior in C++.
This fixes every maple example--most were broken for multiple reasons, including
this one.
This also enables SH4 caching. This includes linking code/data into the P1
area (previously this was not the case).
The maple examples (which indeed involve much use of DMA) require much work to
successfully work with the operand and copyback caches. The vibration example
currently is the most complete, though I should consider more on how I want to
structure maple response operand cache invalidation more generally.
121 lines
3.1 KiB
C++
121 lines
3.1 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/background.hpp"
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#include "holly/region_array.hpp"
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#include "holly/texture_memory_alloc.hpp"
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#include "memorymap.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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};
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// screen space coordinates
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const struct vertex quad_verticies[4] = {
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{ 200.f, 360.f, 0.1f },
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{ 200.f, 120.f, 0.1f },
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{ 440.f, 120.f, 0.1f },
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{ 440.f, 360.f, 0.1f },
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};
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uint32_t transform(uint32_t * ta_parameter_buf)
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{
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auto parameter = ta_parameter_writer(ta_parameter_buf);
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constexpr uint32_t base_color = 0xffff0000;
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parameter.append<global_sprite>() = global_sprite(base_color);
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parameter.append<vertex_sprite_type_0>() =
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vertex_sprite_type_0(quad_verticies[0].x,
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quad_verticies[0].y,
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quad_verticies[0].z,
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quad_verticies[1].x,
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quad_verticies[1].y,
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quad_verticies[1].z,
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quad_verticies[2].x,
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quad_verticies[2].y,
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quad_verticies[2].z,
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quad_verticies[3].x,
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quad_verticies[3].y);
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// curiously, there is no quad_veritices[3].z in vertex_sprite_type_0
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parameter.append<global_end_of_list>() = global_end_of_list();
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return parameter.offset;
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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);
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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 + 64 + 32) + 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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constexpr uint32_t tiles = (640 / 32) * (320 / 32);
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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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while (true) {
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ta_polygon_converter_init(opb_size.total() * tiles, ta_alloc);
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uint32_t ta_parameter_size = transform(ta_parameter_buf);
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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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core_start_render(frame_ix, num_frames);
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core_wait_end_of_render_video();
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while (!spg_status::vsync(holly.SPG_STATUS));
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core_flip(frame_ix, num_frames);
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while (spg_status::vsync(holly.SPG_STATUS));
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frame_ix += 1;
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}
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}
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